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{
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/***************************************************************************
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DBControlGrid.pas
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-----------
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An interface to DB aware Controls
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Initial Revision : Sun Mar 8 2015
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***************************************************************************/
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Unashameably hacked from DBGrid.Pas (Copyright (C) 2003 Jesus Reyes Aguilar.)
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by Tony Whyman (tony@mwasoftware.co.uk) .Additional source code is
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Copyright (c) McCallum Whyman Associates Ltd (trading as MWA Software) 2015.
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This unit defines TDBControlGrid: a lookalike rather than a clone for the Delphi
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TDBCrtlGrid. TDBControlGrid is a single column grid that replicates a TWinControl
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- typically a TPanel or a TFrame in each row. Each row corresponding to the rows
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of the linked DataSource. Any data aware control on the replicated (e.g.) TPanel
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will then appear to have the appropriate value for the row.
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The replicated control is not part of this control but must be added by the
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programmer at design time, and linked to the "DrawPanel" property.
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Rows can be edited, inserted (append only) or deleted.
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Distributed and licensed under the Library GNU General Public License
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see https://www.gnu.org/licenses/lgpl.html with the following modification:
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent modules,
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and to copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the terms
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and conditions of the license of that module. An independent module is a
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module which is not derived from or based on this library. If you modify this
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library, you may extend this exception to your version of the library, but
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you are not obligated to do so. If you do not wish to do so, delete this
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exception statement from your version.
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}
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unit DBControlGrid;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, Controls, SysUtils, DB, Grids, DBGrids, Graphics, StdCtrls,
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LMessages;
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{
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The TRowCache is where we keep track of the DataSet and cache images of each row.
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TDBControlGrid is really a slight of hand. Only the active record is shown in
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the panel and the others are cached and displayed as images.
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The image cache is indexed by TDataSet.RecNo and accessed by current active
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record number (the data being displayed on the panel) and row offset from this
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record number.
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This is efficient but gives us a problem as the TDataSet model does not remove
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deleted records. Instead it simply marks them as deleted. Likewise, we need to
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keep track of deleted rows and skip over them when accessing the cache.
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When alternate row colours are in use, the cache is also used to keep track of the
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correct row colour as we must similarly ignore delete rows when calculating the
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correct colour. Odd and Even row numbers is not good enough here.
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}
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type
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TRowCacheState = (rcEmpty,rcPresent,rcDeleted);
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TRowDetails = record
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FState: TRowCacheState;
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FAlternateColor: boolean;
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FBitmap: TBitmap;
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end;
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{ TRowCache }
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TRowCache = class
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private
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FAltColorStartNormal: boolean;
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FHeight: integer;
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FList: array of TRowDetails;
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FUseAlternateColors: boolean;
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FWidth: integer;
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procedure FreeImages(Reset: boolean);
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function GetAlternateColor(RecNo: integer): boolean;
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function Render(Control: TWinControl): TBitmap;
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procedure ExtendCache(aMaxIndex: integer);
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procedure OnWidthChange(Sender: TObject);
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procedure SetHeight(AValue: integer);
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procedure SetUseAlternateColors(AValue: boolean);
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procedure SetWidth(AValue: integer);
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public
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constructor Create;
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destructor Destroy; override;
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procedure ClearCache;
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function Add2Cache(RecNo: Longint; Control: TWinControl): TBitmap;
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function GetRowImage(RecNo, Offset: integer): TBitmap;
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function IsEmpty(RecNo: integer): boolean;
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procedure MarkAsDeleted(RecNo: integer);
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property AlternateColor[RecNo: integer]: boolean read GetAlternateColor;
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property Width: integer read FWidth write SetWidth;
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property Height: integer read FHeight write SetHeight;
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property AltColorStartNormal: boolean read FAltColorStartNormal write FAltColorStartNormal;
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property UseAlternateColors: boolean read FUseAlternateColors write SetUseAlternateColors;
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end;
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{ TDBControlGridDataLink }
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TDBControlGridDataLink = class(TComponentDataLink)
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private
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FOnCheckBrowseMode: TDataSetNotifyEvent;
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protected
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procedure CheckBrowseMode; override;
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public
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property OnCheckBrowseMode: TDataSetNotifyEvent read FOnCheckBrowseMode write FOnCheckBrowseMode;
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end;
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TKeyDownHandler = procedure (Sender: TObject; var Key: Word; Shift: TShiftState; var Done: boolean) of object;
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TPanelGridOption = (dgpIndicator,dgpDisableInsert,dgpCancelOnExit);
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TPanelGridOptions = set of TPanelGridOption;
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{ TDBControlGrid }
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TDBControlGrid = class(TCustomGrid)
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private
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{ Private declarations }
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FDataLink: TDBControlGridDataLink;
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FDefaultPositionAtEnd: boolean;
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FDrawPanel: TWinControl;
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FDrawingActiveRecord: boolean;
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FOldPosition: Integer;
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FOnKeyDownHander: TKeyDownHandler;
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FOptions: TPanelGridOptions;
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FWeHaveFocus: boolean;
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FRowCache: TRowCache;
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FDrawRow: integer; {The current row in the draw panel}
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FSelectedRow: integer; {The row containing the current selection}
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FSelectedRecNo: integer; {The DataSet RecNo for the current row}
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FRequiredRecNo: integer; {Used after a big jump and is the dataset recno
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that we want to end up with}
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FInCacheRefresh: boolean; {Cache refresh in progress during paint}
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FCacheRefreshQueued: boolean; {cache refresh requested during wmpaint}
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FModified: boolean;
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FLastRecordCount: integer;
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{Used to pass mouse clicks to panel when focused row changes}
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FLastMouse: TPoint;
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FLastMouseButton: TMouseButton;
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FLastMouseShiftState: TShiftState;
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procedure EmptyGrid;
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function GetDataSource: TDataSource;
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function GetRecordCount: Integer;
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procedure GetScrollbarParams(out aRange, aPage, aPos: Integer);
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function GridCanModify: boolean;
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procedure DoDrawRow(aRow: integer; aRect: TRect; aState: TGridDrawState);
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procedure DoMoveRecord(Data: PtrInt);
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procedure DoScrollDataSet(Data: PtrInt);
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procedure DoSetupDrawPanel(Data: PtrInt);
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procedure DoSendMouseClicks(Data: PtrInt);
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procedure KeyDownHandler(Sender: TObject; var Key: Word; Shift: TShiftState);
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procedure OnRecordChanged(Field:TField);
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procedure OnCheckBrowseMode(aDataSet: TDataSet);
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procedure OnDataSetChanged(aDataSet: TDataSet);
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procedure OnDataSetOpen(aDataSet: TDataSet);
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procedure OnDataSetClose(aDataSet: TDataSet);
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procedure OnDrawPanelResize(Sender: TObject);
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procedure OnEditingChanged(aDataSet: TDataSet);
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procedure OnInvalidDataSet(aDataSet: TDataSet);
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procedure OnInvalidDataSource(aDataSet: TDataset);
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procedure OnLayoutChanged(aDataSet: TDataSet);
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procedure OnNewDataSet(aDataSet: TDataset);
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procedure OnDataSetScrolled(aDataSet:TDataSet; Distance: Integer);
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procedure OnUpdateData(aDataSet: TDataSet);
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procedure SetDataSource(AValue: TDataSource);
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procedure SetDrawPanel(AValue: TWinControl);
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procedure SetOptions(AValue: TPanelGridOptions);
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procedure SetupDrawPanel(aRow: integer);
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function UpdateGridCounts: Integer;
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procedure UpdateBufferCount;
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procedure UpdateDrawPanelBounds(aRow: integer);
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procedure UpdateScrollbarRange;
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procedure WMVScroll(var Message : TLMVScroll); message LM_VScroll;
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function ISEOF: boolean;
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function ValidDataSet: boolean;
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function InsertCancelable: boolean;
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protected
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{ Protected declarations }
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function GetBufferCount: integer; virtual;
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procedure DoEnter; override;
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procedure DoExit; override;
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procedure DoGridResize;
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procedure DoOnResize; override;
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procedure DrawAllRows; override;
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procedure DrawRow(ARow: Integer); override;
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procedure DrawCell(aCol,aRow: Integer; aRect: TRect; aState:TGridDrawState); override;
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procedure DrawIndicator(ACanvas: TCanvas; aRow: integer; R: TRect; Opt: TDataSetState; MultiSel: boolean); virtual;
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procedure GridMouseWheel(shift: TShiftState; Delta: Integer); override;
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procedure KeyDown(var Key : Word; Shift : TShiftState); override;
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procedure LinkActive(Value: Boolean); virtual;
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procedure LayoutChanged; virtual;
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procedure MouseDown(Button: TMouseButton; Shift:TShiftState; X,Y:Integer); override;
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procedure MouseUp(Button: TMouseButton; Shift:TShiftState; X,Y:Integer); override;
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procedure MoveSelection; override;
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procedure Notification(AComponent: TComponent; Operation: TOperation); override;
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procedure PrepareCanvas(aCol,aRow: Integer; aState:TGridDrawState); override;
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procedure ResetSizes; override;
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procedure SetColor(Value: TColor); override;
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procedure UpdateActive; virtual;
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procedure UpdateData; virtual;
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procedure UpdateShowing; override;
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procedure UpdateVertScrollbar(const aVisible: boolean; const aRange,aPage,aPos: Integer); override;
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public
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{ Public declarations }
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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function MouseToRecordOffset(const x, y: Integer; out RecordOffset: Integer
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): TGridZone;
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function ExecuteAction(AAction: TBasicAction): Boolean; override;
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function UpdateAction(AAction: TBasicAction): Boolean; override;
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property Datalink: TDBControlGridDataLink read FDatalink;
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published
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{ Published declarations }
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property Align;
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property AlternateColor;
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property AltColorStartNormal;
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property Anchors;
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property BiDiMode;
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property BorderSpacing;
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property BorderStyle;
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property CellHintPriority;
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property Color;
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property Constraints;
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property DataSource: TDataSource read GetDataSource write SetDataSource;
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property DefaultRowHeight;
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property DefaultPositionAtEnd: boolean read FDefaultPositionAtEnd write FDefaultPositionAtEnd;
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property DragCursor;
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property DragMode;
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property DrawPanel: TWinControl read FDrawPanel write SetDrawPanel;
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property Enabled;
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property FixedColor;
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property FixedCols;
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property Flat;
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property Font;
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property Options: TPanelGridOptions read FOptions write SetOptions;
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property ParentBiDiMode;
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property ParentColor default false;
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property ParentFont;
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property PopupMenu;
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property Scrollbars default ssAutoVertical;
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property ShowHint;
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property TabOrder;
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property TabStop;
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property UseXORFeatures;
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property Visible;
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property OnContextPopup;
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property OnDblClick;
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property OnDragDrop;
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property OnDragOver;
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property OnEndDrag;
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property OnEnter;
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property OnExit;
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property OnGetCellHint;
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property OnKeyDown;
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property OnKeyPress;
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property OnKeyUp;
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property OnKeyDownHander: TKeyDownHandler read FOnKeyDownHander write FOnKeyDownHander;
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property OnMouseDown;
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property OnMouseEnter;
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property OnMouseLeave;
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property OnMouseMove;
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property OnMouseUp;
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property OnMouseWheel;
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property OnMouseWheelDown;
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property OnMouseWheelUp;
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property OnPrepareCanvas;
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property OnStartDrag;
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property OnUTF8KeyPress;
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end;
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implementation
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uses LCLType, Math, LCLIntf, Forms, LCLMessageGlue;
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{ TDBControlGridDataLink }
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procedure TDBControlGridDataLink.CheckBrowseMode;
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begin
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inherited CheckBrowseMode;
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if assigned(FOnCheckBrowseMode) then
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OnCheckBrowseMode(DataSet);
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end;
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{ TRowCache }
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function TRowCache.Render(Control: TWinControl): TBitmap;
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var Container: TBitmap;
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Msg: TLMPaint;
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begin
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Container := TBitmap.Create;
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try
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Container.SetSize(Control.Width,Control.Height);
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Control.PaintTo(Container.Canvas,0,0);
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except
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Container.Free;
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raise
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end;
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Result := Container;
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end;
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procedure TRowCache.FreeImages(Reset: boolean);
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var i: integer;
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altColor: boolean;
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begin
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altColor := not AltColorStartNormal;
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for i := 0 to Length(FList) - 1 do
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begin
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if (FList[i].FState <> rcEmpty) and (FList[i].FBitmap <> nil) then
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begin
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FList[i].FBitmap.Free;
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FList[i].FBitmap := nil;
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end;
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if Reset or (FList[i].FState = rcPresent) then
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FList[i].FState := rcEmpty;
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if FList[i].FState <> rcDeleted then
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329 |
begin
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330 |
FList[i].FAlternateColor := altColor;
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altColor := not altColor;
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end;
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end;
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end;
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335 |
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function TRowCache.GetAlternateColor(RecNo: integer): boolean;
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337 |
begin
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338 |
ExtendCache(RecNo);
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Dec(RecNo);
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340 |
if (RecNo >= 0) and (RecNo < Length(FList)) then
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Result := FList[RecNo].FAlternateColor
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else
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Result := false;
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end;
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345 |
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346 |
procedure TRowCache.ExtendCache(aMaxIndex: integer);
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var i: integer;
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StartIndex: integer;
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altColor: boolean;
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begin
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351 |
if aMaxIndex > Length(FList) then
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352 |
begin
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353 |
aMaxIndex := aMaxIndex + 10;
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354 |
StartIndex := Length(FList);
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SetLength(FList,aMaxIndex);
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if not UseAlternateColors then
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357 |
altColor := false
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358 |
else
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359 |
if StartIndex = 0 then
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360 |
altColor := not AltColorStartNormal
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361 |
else
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362 |
altColor := not FList[StartIndex-1].FAlternateColor;
|
363 |
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364 |
for i := StartIndex to Length(FList) - 1 do
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365 |
begin
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366 |
FList[i].FState := rcEmpty;
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367 |
FList[i].FAlternateColor := altColor;
|
368 |
if UseAlternateColors then
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369 |
altColor := not altColor;
|
370 |
end;
|
371 |
end;
|
372 |
end;
|
373 |
|
374 |
procedure TRowCache.OnWidthChange(Sender: TObject);
|
375 |
begin
|
376 |
FreeImages(false);
|
377 |
end;
|
378 |
|
379 |
procedure TRowCache.SetHeight(AValue: integer);
|
380 |
begin
|
381 |
if FHeight = AValue then Exit;
|
382 |
FHeight := AValue;
|
383 |
FreeImages(false);
|
384 |
end;
|
385 |
|
386 |
procedure TRowCache.SetUseAlternateColors(AValue: boolean);
|
387 |
begin
|
388 |
if FUseAlternateColors = AValue then Exit;
|
389 |
FUseAlternateColors := AValue;
|
390 |
FreeImages(false);
|
391 |
end;
|
392 |
|
393 |
procedure TRowCache.SetWidth(AValue: integer);
|
394 |
begin
|
395 |
if FWidth = AValue then Exit;
|
396 |
FWidth := AValue;
|
397 |
FreeImages(false);
|
398 |
end;
|
399 |
|
400 |
constructor TRowCache.Create;
|
401 |
begin
|
402 |
SetLength(FList,0);
|
403 |
end;
|
404 |
|
405 |
destructor TRowCache.Destroy;
|
406 |
begin
|
407 |
ClearCache;
|
408 |
inherited Destroy;
|
409 |
end;
|
410 |
|
411 |
procedure TRowCache.ClearCache;
|
412 |
begin
|
413 |
FreeImages(true);
|
414 |
end;
|
415 |
|
416 |
function TRowCache.Add2Cache(RecNo: Longint; Control: TWinControl): TBitmap;
|
417 |
var i: integer;
|
418 |
begin
|
419 |
Dec(RecNo); {Adust to zero base}
|
420 |
ExtendCache(RecNo + 1);
|
421 |
FList[RecNo].FState := rcPresent;
|
422 |
FList[RecNo].FBitmap := Render(Control);
|
423 |
Result := FList[RecNo].FBitmap;
|
424 |
end;
|
425 |
|
426 |
function TRowCache.GetRowImage(RecNo, Offset: integer): TBitmap;
|
427 |
begin
|
428 |
Result := nil;
|
429 |
Dec(RecNo); {adjust to zero base}
|
430 |
if (RecNo < 0) or (RecNo >= Length(FList)) then
|
431 |
Exit;
|
432 |
|
433 |
if Offset >= 0 then
|
434 |
repeat
|
435 |
while (RecNo < Length(FList)) and (FList[RecNo].FState = rcDeleted) do
|
436 |
Inc(RecNo);
|
437 |
|
438 |
if RecNo >= Length(FList) then
|
439 |
Exit;
|
440 |
|
441 |
if Offset = 0 then
|
442 |
begin
|
443 |
if FList[RecNo].FState = rcPresent then
|
444 |
Result := FList[RecNo].FBitmap;
|
445 |
Exit;
|
446 |
end;
|
447 |
Inc(RecNo);
|
448 |
Dec(Offset);
|
449 |
until false
|
450 |
else
|
451 |
repeat
|
452 |
Inc(Offset);
|
453 |
Dec(RecNo);
|
454 |
while (RecNo > 0) and (FList[RecNo].FState = rcDeleted) do
|
455 |
Dec(RecNo);
|
456 |
|
457 |
if RecNo < 0 then
|
458 |
Exit;
|
459 |
|
460 |
if Offset = 0 then
|
461 |
begin
|
462 |
if FList[RecNo].FState = rcPresent then
|
463 |
Result := FList[RecNo].FBitmap;
|
464 |
Exit;
|
465 |
end;
|
466 |
until false;
|
467 |
end;
|
468 |
|
469 |
function TRowCache.IsEmpty(RecNo: integer): boolean;
|
470 |
begin
|
471 |
Dec(RecNo);
|
472 |
Result := (RecNo < 0) or (RecNo >= Length(FList)) or (FList[RecNo].FState = rcEmpty);
|
473 |
end;
|
474 |
|
475 |
procedure TRowCache.MarkAsDeleted(RecNo: integer);
|
476 |
var altColor: boolean;
|
477 |
i: integer;
|
478 |
begin
|
479 |
Dec(RecNo); {adjust to zero base}
|
480 |
if (RecNo < 0) or (RecNo >= Length(FList)) then
|
481 |
Exit;
|
482 |
|
483 |
FList[RecNo].FState := rcDeleted;
|
484 |
if not UseAlternateColors then
|
485 |
Exit;
|
486 |
|
487 |
{Reset Alternate Colours}
|
488 |
|
489 |
if RecNo = 0 then
|
490 |
altColor := not AltColorStartNormal
|
491 |
else
|
492 |
altColor := not FList[RecNo-1].FAlternateColor;
|
493 |
|
494 |
for i := RecNo + 1 to Length(FList) - 1 do
|
495 |
begin
|
496 |
if FList[i].FState <> rcDeleted then
|
497 |
begin
|
498 |
FList[i].FAlternateColor := altColor;
|
499 |
altColor := not altColor;
|
500 |
if FList[i].FState = rcPresent then
|
501 |
begin
|
502 |
FList[i].FBitmap.Free;
|
503 |
FList[i].FState := rcEmpty;
|
504 |
end;
|
505 |
end;
|
506 |
end;
|
507 |
end;
|
508 |
|
509 |
{ TDBControlGrid }
|
510 |
|
511 |
procedure TDBControlGrid.EmptyGrid;
|
512 |
var
|
513 |
OldFixedRows: Integer;
|
514 |
begin
|
515 |
OldFixedRows := FixedRows;
|
516 |
Clear;
|
517 |
RowCount := OldFixedRows + 1;
|
518 |
if dgpIndicator in FOptions then
|
519 |
ColWidths[0]:=12;
|
520 |
if assigned(FDrawPanel) then
|
521 |
FDrawPanel.Visible := false;
|
522 |
end;
|
523 |
|
524 |
function TDBControlGrid.GetDataSource: TDataSource;
|
525 |
begin
|
526 |
Result:= FDataLink.DataSource;
|
527 |
end;
|
528 |
|
529 |
function TDBControlGrid.GetRecordCount: Integer;
|
530 |
begin
|
531 |
if assigned(FDataLink.DataSet) then
|
532 |
result := FDataLink.DataSet.RecordCount
|
533 |
else
|
534 |
result := 0;
|
535 |
end;
|
536 |
|
537 |
procedure TDBControlGrid.GetScrollbarParams(out aRange, aPage, aPos: Integer);
|
538 |
begin
|
539 |
if (FDatalink<>nil) and (FDataLink.DataSet <> nil) and FDatalink.Active then begin
|
540 |
if FDatalink.dataset.IsSequenced then begin
|
541 |
aRange := GetRecordCount + VisibleRowCount - 1;
|
542 |
aPage := VisibleRowCount;
|
543 |
if aPage<1 then aPage := 1;
|
544 |
if FDatalink.BOF then aPos := 0 else
|
545 |
if FDatalink.EOF then aPos := aRange
|
546 |
else
|
547 |
aPos := FDataLink.DataSet.RecNo - 1; // RecNo is 1 based
|
548 |
if aPos<0 then aPos:=0;
|
549 |
end else begin
|
550 |
aRange := 6;
|
551 |
aPage := 2;
|
552 |
if FDatalink.EOF then aPos := 4 else
|
553 |
if FDatalink.BOF then aPos := 0
|
554 |
else aPos := 2;
|
555 |
end;
|
556 |
end else begin
|
557 |
aRange := 0;
|
558 |
aPage := 0;
|
559 |
aPos := 0;
|
560 |
end;
|
561 |
end;
|
562 |
|
563 |
function TDBControlGrid.GridCanModify: boolean;
|
564 |
begin
|
565 |
result := not FDataLink.ReadOnly
|
566 |
and ValidDataSet and FDatalink.DataSet.CanModify;
|
567 |
end;
|
568 |
|
569 |
|
570 |
procedure TDBControlGrid.DoDrawRow(aRow: integer; aRect: TRect;
|
571 |
aState: TGridDrawState);
|
572 |
var CachedRow: TBitmap;
|
573 |
begin
|
574 |
CachedRow := FRowCache.GetRowImage(FSelectedRecNo,aRow-FDrawRow);
|
575 |
{if the row is in the cache then draw it - otherwise schedule a cache refresh cycle}
|
576 |
if CachedRow = nil then
|
577 |
begin
|
578 |
if not FCacheRefreshQueued then
|
579 |
begin
|
580 |
FCacheRefreshQueued := true;
|
581 |
Application.QueueAsyncCall(@DoMoveRecord,PtrInt(aRow));
|
582 |
end
|
583 |
end
|
584 |
else
|
585 |
Canvas.Draw(aRect.Left,aRect.Top,CachedRow)
|
586 |
end;
|
587 |
|
588 |
procedure TDBControlGrid.DoMoveRecord(Data: PtrInt);
|
589 |
var aRow: integer;
|
590 |
begin
|
591 |
if AppDestroying in Application.Flags then Exit;
|
592 |
|
593 |
FCacheRefreshQueued := false;
|
594 |
aRow := integer(Data);
|
595 |
FInCacheRefresh := true;
|
596 |
if assigned(FDataLink.DataSet) then
|
597 |
FDatalink.DataSet.MoveBy(aRow - FDrawRow)
|
598 |
end;
|
599 |
|
600 |
procedure TDBControlGrid.DoSetupDrawPanel(Data: PtrInt);
|
601 |
begin
|
602 |
if AppDestroying in Application.Flags then Exit;
|
603 |
SetupDrawPanel(FDrawRow);
|
604 |
end;
|
605 |
|
606 |
procedure TDBControlGrid.DoSendMouseClicks(Data: PtrInt);
|
607 |
var P: TPoint;
|
608 |
Control: TControl;
|
609 |
begin
|
610 |
if AppDestroying in Application.Flags then Exit;
|
611 |
|
612 |
if assigned(FDrawPanel) and (FLastMouse.X <> 0) then
|
613 |
begin
|
614 |
P := ClientToScreen(FLastMouse);
|
615 |
Control := FindControlAtPosition(P,false);
|
616 |
if (Control <> nil) and (Control is TWinControl) then
|
617 |
TWinControl(Control).SetFocus
|
618 |
else
|
619 |
Control := FDrawPanel;
|
620 |
|
621 |
P := Control.ScreenToClient(P);
|
622 |
|
623 |
LCLSendMouseDownMsg(Control,P.X,P.Y,FLastMouseButton,FLastMouseShiftState);
|
624 |
LCLSendMouseUpMsg(Control,P.X,P.Y, FLastMouseButton,FLastMouseShiftState);
|
625 |
|
626 |
end;
|
627 |
FLastMouse.X := 0;
|
628 |
end;
|
629 |
|
630 |
procedure TDBControlGrid.KeyDownHandler(Sender: TObject; var Key: Word;
|
631 |
Shift: TShiftState);
|
632 |
var Done: boolean;
|
633 |
begin
|
634 |
if Visible and assigned(FDrawPanel) and FDrawPanel.Visible and FWeHaveFocus then
|
635 |
begin
|
636 |
Done := false;
|
637 |
if assigned(FOnKeyDownHander) then
|
638 |
OnKeyDownHander(Sender,Key,Shift,Done);
|
639 |
if Done then Exit;
|
640 |
|
641 |
KeyDown(Key,Shift)
|
642 |
end;
|
643 |
end;
|
644 |
|
645 |
procedure TDBControlGrid.OnRecordChanged(Field: TField);
|
646 |
begin
|
647 |
UpdateActive
|
648 |
end;
|
649 |
|
650 |
procedure TDBControlGrid.OnCheckBrowseMode(aDataSet: TDataSet);
|
651 |
var RecNo: integer;
|
652 |
begin
|
653 |
if assigned(FDrawPanel) and (aDataSet.RecNo > 0)
|
654 |
and (FModified or (FRowCache.IsEmpty(aDataSet.RecNo))) then
|
655 |
begin
|
656 |
RecNo := aDataSet.RecNo;
|
657 |
Application.ProcessMessages; {A couple of trips round the message loop seems to be necessary}
|
658 |
Application.ProcessMessages;
|
659 |
if RecNo = aDataSet.RecNo then {Guard against sudden changes}
|
660 |
FRowCache.Add2Cache(aDataSet.RecNo,FDrawPanel);
|
661 |
end;
|
662 |
end;
|
663 |
|
664 |
procedure TDBControlGrid.OnDataSetChanged(aDataSet: TDataSet);
|
665 |
begin
|
666 |
if (aDataSet.State = dsBrowse) and (FLastRecordCount > GetRecordCount) then
|
667 |
begin
|
668 |
{must be delete}
|
669 |
FRowCache.MarkAsDeleted(FSelectedRecNo);
|
670 |
Dec(FSelectedRow);
|
671 |
LayoutChanged;
|
672 |
end;
|
673 |
FLastRecordCount := GetRecordCount;
|
674 |
if aDataSet.State = dsInsert then
|
675 |
FRequiredRecNo := aDataSet.RecNo + 1;
|
676 |
UpdateActive
|
677 |
end;
|
678 |
|
679 |
procedure TDBControlGrid.OnDataSetOpen(aDataSet: TDataSet);
|
680 |
begin
|
681 |
LinkActive(true);
|
682 |
UpdateActive;
|
683 |
end;
|
684 |
|
685 |
procedure TDBControlGrid.OnDataSetClose(aDataSet: TDataSet);
|
686 |
begin
|
687 |
LinkActive(false);
|
688 |
end;
|
689 |
|
690 |
procedure TDBControlGrid.OnDrawPanelResize(Sender: TObject);
|
691 |
begin
|
692 |
FRowCache.Height := FDrawPanel.Height;
|
693 |
DefaultRowHeight := FDrawPanel.Height;
|
694 |
end;
|
695 |
|
696 |
procedure TDBControlGrid.OnEditingChanged(aDataSet: TDataSet);
|
697 |
begin
|
698 |
FModified := true;
|
699 |
end;
|
700 |
|
701 |
procedure TDBControlGrid.OnInvalidDataSet(aDataSet: TDataSet);
|
702 |
begin
|
703 |
LinkActive(False);
|
704 |
end;
|
705 |
|
706 |
procedure TDBControlGrid.OnInvalidDataSource(aDataSet: TDataset);
|
707 |
begin
|
708 |
LinkActive(False);
|
709 |
end;
|
710 |
|
711 |
procedure TDBControlGrid.OnLayoutChanged(aDataSet: TDataSet);
|
712 |
begin
|
713 |
LayoutChanged;
|
714 |
end;
|
715 |
|
716 |
procedure TDBControlGrid.OnNewDataSet(aDataSet: TDataset);
|
717 |
begin
|
718 |
LinkActive(True);
|
719 |
UpdateActive;
|
720 |
end;
|
721 |
|
722 |
procedure TDBControlGrid.OnDataSetScrolled(aDataSet: TDataSet; Distance: Integer);
|
723 |
begin
|
724 |
UpdateScrollBarRange;
|
725 |
if Distance <> 0 then
|
726 |
begin
|
727 |
FDrawRow := FixedRows + FDataLink.ActiveRecord;
|
728 |
|
729 |
if not FInCacheRefresh then
|
730 |
begin
|
731 |
Row := FDrawRow;
|
732 |
FSelectedRow := FDrawRow;
|
733 |
FSelectedRecNo := aDataSet.RecNo;
|
734 |
SetupDrawPanel(FDrawRow);
|
735 |
end
|
736 |
else
|
737 |
Application.QueueAsyncCall(@DoSetupDrawPanel,0);
|
738 |
end
|
739 |
else
|
740 |
UpdateActive;
|
741 |
end;
|
742 |
|
743 |
procedure TDBControlGrid.OnUpdateData(aDataSet: TDataSet);
|
744 |
begin
|
745 |
UpdateData;
|
746 |
end;
|
747 |
|
748 |
procedure TDBControlGrid.SetDataSource(AValue: TDataSource);
|
749 |
begin
|
750 |
if AValue = FDatalink.Datasource then Exit;
|
751 |
FDataLink.DataSource := AValue;
|
752 |
UpdateActive;
|
753 |
end;
|
754 |
|
755 |
procedure TDBControlGrid.SetDrawPanel(AValue: TWinControl);
|
756 |
var theForm: TWinControl;
|
757 |
begin
|
758 |
if FDrawPanel = AValue then Exit;
|
759 |
if FDrawPanel <> nil then
|
760 |
begin
|
761 |
RemoveFreeNotification(FDrawPanel);
|
762 |
FDrawPanel.RemoveAllHandlersOfObject(self);
|
763 |
theForm := Parent;
|
764 |
while not (theForm is TCustomForm) and (theForm.Parent <> nil) do
|
765 |
theForm := theForm.Parent;
|
766 |
FDrawPanel.Parent := theForm;
|
767 |
end;
|
768 |
FRowCache.ClearCache;
|
769 |
try
|
770 |
FDrawPanel := AValue;
|
771 |
if assigned(FDrawPanel) then
|
772 |
begin
|
773 |
FDrawPanel.Parent := self;
|
774 |
DefaultRowHeight := FDrawPanel.Height;
|
775 |
if csDesigning in ComponentState then
|
776 |
UpdateDrawPanelBounds(0)
|
777 |
else
|
778 |
FDrawPanel.Visible := false;
|
779 |
FRowCache.Height := FDrawPanel.Height;
|
780 |
FRowCache.Width := FDrawPanel.Width;
|
781 |
AddHandlerOnResize(@OnDrawPanelResize);
|
782 |
FreeNotification(FDrawPanel);
|
783 |
end;
|
784 |
except
|
785 |
FDrawPanel := nil;
|
786 |
raise;
|
787 |
end;
|
788 |
end;
|
789 |
|
790 |
procedure TDBControlGrid.SetOptions(AValue: TPanelGridOptions);
|
791 |
begin
|
792 |
if FOptions = AValue then Exit;
|
793 |
FOptions := AValue;
|
794 |
if dgpIndicator in FOptions then
|
795 |
begin
|
796 |
FixedCols := 1;
|
797 |
ColWidths[0] := 12
|
798 |
end
|
799 |
else
|
800 |
FixedCols := 0;
|
801 |
end;
|
802 |
|
803 |
procedure TDBControlGrid.SetupDrawPanel(aRow: integer);
|
804 |
begin
|
805 |
if ValidDataSet and FRowCache.AlternateColor[FDataLink.DataSet.RecNo] then
|
806 |
FDrawPanel.Color := AlternateColor
|
807 |
else
|
808 |
FDrawPanel.Color := self.Color;
|
809 |
FDrawPanel.Visible := true;
|
810 |
UpdateDrawPanelBounds(aRow); {Position Draw Panel over expanded Row}
|
811 |
Invalidate;
|
812 |
end;
|
813 |
|
814 |
function TDBControlGrid.UpdateGridCounts: Integer;
|
815 |
var
|
816 |
RecCount: Integer;
|
817 |
FRCount, FCCount: Integer;
|
818 |
begin
|
819 |
BeginUpdate;
|
820 |
try
|
821 |
FRCount := 0;
|
822 |
if dgpIndicator in FOptions then
|
823 |
FCCount := 1
|
824 |
else
|
825 |
FCCount := 0;
|
826 |
if FDataLink.Active then begin
|
827 |
UpdateBufferCount;
|
828 |
RecCount := FDataLink.RecordCount;
|
829 |
if RecCount<1 then
|
830 |
RecCount := 1;
|
831 |
end else begin
|
832 |
RecCount := 0;
|
833 |
if FRCount=0 then
|
834 |
// need to be large enough to hold indicator
|
835 |
// if there is one, and if there are no titles
|
836 |
RecCount := FCCount;
|
837 |
end;
|
838 |
|
839 |
Inc(RecCount, FRCount);
|
840 |
|
841 |
RowCount := RecCount;
|
842 |
FixedRows := FRCount;
|
843 |
Result := RowCount ;
|
844 |
finally
|
845 |
EndUpdate;
|
846 |
end;
|
847 |
end;
|
848 |
|
849 |
procedure TDBControlGrid.UpdateBufferCount;
|
850 |
var
|
851 |
BCount: Integer;
|
852 |
begin
|
853 |
if FDataLink.Active then begin
|
854 |
BCount := GetBufferCount;
|
855 |
if BCount<1 then
|
856 |
BCount := 1;
|
857 |
FDataLink.BufferCount:= BCount;
|
858 |
end;
|
859 |
end;
|
860 |
|
861 |
procedure TDBControlGrid.UpdateDrawPanelBounds(aRow: integer);
|
862 |
var R: TRect;
|
863 |
begin
|
864 |
R := Rect(0,0,0,0);
|
865 |
if assigned(FDrawPanel) and
|
866 |
(aRow >= 0) and (aRow < RowCount) then
|
867 |
begin
|
868 |
// Upper and Lower bounds for this row
|
869 |
ColRowToOffSet(False, True, aRow, R.Top, R.Bottom);
|
870 |
//Bounds for visible Column
|
871 |
ColRowToOffSet(True,True,ColCount-1,R.Left,R.RIght);
|
872 |
FDrawPanel.BoundsRect := R;
|
873 |
end;
|
874 |
end;
|
875 |
|
876 |
procedure TDBControlGrid.UpdateScrollbarRange;
|
877 |
var
|
878 |
aRange, aPage, aPos: Integer;
|
879 |
ScrollInfo: TScrollInfo;
|
880 |
begin
|
881 |
|
882 |
if not HandleAllocated then exit;
|
883 |
|
884 |
|
885 |
GetScrollBarParams(aRange, aPage, aPos);
|
886 |
|
887 |
FillChar(ScrollInfo, SizeOf(ScrollInfo), 0);
|
888 |
ScrollInfo.cbSize := SizeOf(ScrollInfo);
|
889 |
|
890 |
{TODO: try to move this out}
|
891 |
{$ifdef WINDOWS}
|
892 |
ScrollInfo.fMask := SIF_ALL or SIF_DISABLENOSCROLL;
|
893 |
ScrollInfo.ntrackPos := 0;
|
894 |
{$else}
|
895 |
ScrollInfo.fMask := SIF_ALL or SIF_UPDATEPOLICY;
|
896 |
//ScrollInfo.ntrackPos := SB_POLICY_CONTINUOUS;
|
897 |
ScrollInfo.ntrackPos := SB_POLICY_DISCONTINUOUS;
|
898 |
{$endif}
|
899 |
ScrollInfo.nMin := 0;
|
900 |
ScrollInfo.nMax := aRange;
|
901 |
ScrollInfo.nPos := Min(aPos,aRange-aPage);
|
902 |
ScrollInfo.nPage := aPage;
|
903 |
// the redraw argument of SetScrollInfo means under gtk
|
904 |
// if the scrollbar is visible or not, in windows it
|
905 |
// seems to mean if the scrollbar is redrawn or not
|
906 |
// to reflect the scrollbar changes made
|
907 |
SetScrollInfo(Handle, SB_VERT, ScrollInfo,
|
908 |
(ScrollBars in [ssBoth, ssVertical]) or
|
909 |
((Scrollbars in [ssAutoVertical, ssAutoBoth]) and (aRange>aPAge))
|
910 |
);
|
911 |
FOldPosition := aPos;
|
912 |
end;
|
913 |
|
914 |
procedure TDBControlGrid.WMVScroll(var Message: TLMVScroll);
|
915 |
var
|
916 |
IsSeq: boolean;
|
917 |
aPos, aRange, aPage: Integer;
|
918 |
DeltaRec: integer;
|
919 |
|
920 |
function MaxPos: Integer;
|
921 |
begin
|
922 |
if IsSeq then
|
923 |
result := GetRecordCount - 1
|
924 |
else
|
925 |
result := 4;
|
926 |
end;
|
927 |
|
928 |
procedure DsMoveBy(Delta: Integer);
|
929 |
begin
|
930 |
FDataLink.DataSet.MoveBy(Delta);
|
931 |
GetScrollbarParams(aRange, aPage, aPos);
|
932 |
end;
|
933 |
|
934 |
procedure DsGoto(BOF: boolean);
|
935 |
begin
|
936 |
if BOF then FDatalink.DataSet.First
|
937 |
else FDataLink.DataSet.Last;
|
938 |
GetScrollbarParams(aRange, aPage, aPos);
|
939 |
end;
|
940 |
|
941 |
function DsPos: boolean;
|
942 |
begin
|
943 |
result := false;
|
944 |
aPos := Message.Pos;
|
945 |
if aPos=FOldPosition then begin
|
946 |
result := true;
|
947 |
exit;
|
948 |
end;
|
949 |
if aPos>=MaxPos then
|
950 |
dsGoto(False)
|
951 |
else if aPos<=0 then
|
952 |
dsGoto(True)
|
953 |
else if IsSeq then
|
954 |
FDatalink.DataSet.RecNo := aPos + 1
|
955 |
else begin
|
956 |
DeltaRec := Message.Pos - FOldPosition;
|
957 |
if DeltaRec=0 then begin
|
958 |
result := true;
|
959 |
exit
|
960 |
end
|
961 |
else if DeltaRec<-1 then
|
962 |
DsMoveBy(-VisibleRowCount)
|
963 |
else if DeltaRec>1 then
|
964 |
DsMoveBy(VisibleRowCount)
|
965 |
else
|
966 |
DsMoveBy(DeltaRec);
|
967 |
end;
|
968 |
end;
|
969 |
|
970 |
begin
|
971 |
if not FDatalink.Active or not assigned(FDataLink.DataSet) then exit;
|
972 |
|
973 |
IsSeq := FDatalink.DataSet.IsSequenced and not FDataLink.DataSet.Filtered;
|
974 |
case Message.ScrollCode of
|
975 |
SB_TOP:
|
976 |
DsGoto(True);
|
977 |
SB_BOTTOM:
|
978 |
DsGoto(False);
|
979 |
SB_PAGEUP:
|
980 |
DsMoveBy(-VisibleRowCount);
|
981 |
SB_LINEUP:
|
982 |
DsMoveBy(-1);
|
983 |
SB_LINEDOWN:
|
984 |
DsMoveBy(1);
|
985 |
SB_PAGEDOWN:
|
986 |
DsMoveBy(VisibleRowCount);
|
987 |
SB_THUMBPOSITION:
|
988 |
if DsPos then
|
989 |
exit;
|
990 |
SB_THUMBTRACK:
|
991 |
if not (FDatalink.DataSet.IsSequenced) or DsPos then
|
992 |
begin
|
993 |
exit;
|
994 |
end;
|
995 |
else begin
|
996 |
Exit;
|
997 |
end;
|
998 |
end;
|
999 |
|
1000 |
ScrollBarPosition(SB_VERT, aPos);
|
1001 |
FOldPosition:=aPos; end;
|
1002 |
|
1003 |
function TDBControlGrid.ISEOF: boolean;
|
1004 |
begin
|
1005 |
with FDatalink do
|
1006 |
result := ValidDataSet and DataSet.EOF;
|
1007 |
end;
|
1008 |
|
1009 |
function TDBControlGrid.ValidDataSet: boolean;
|
1010 |
begin
|
1011 |
result := FDatalink.Active And (FDatalink.DataSet<>nil)
|
1012 |
end;
|
1013 |
|
1014 |
function TDBControlGrid.InsertCancelable: boolean;
|
1015 |
begin
|
1016 |
Result := ValidDataSet;
|
1017 |
if Result then
|
1018 |
with FDatalink.DataSet do
|
1019 |
Result := (State=dsInsert) and not Modified ;
|
1020 |
end;
|
1021 |
|
1022 |
function TDBControlGrid.GetBufferCount: integer;
|
1023 |
begin
|
1024 |
Result := ClientHeight div DefaultRowHeight;
|
1025 |
end;
|
1026 |
|
1027 |
procedure TDBControlGrid.DoEnter;
|
1028 |
begin
|
1029 |
inherited DoEnter;
|
1030 |
FWeHaveFocus := true;
|
1031 |
end;
|
1032 |
|
1033 |
procedure TDBControlGrid.DoExit;
|
1034 |
begin
|
1035 |
FWeHaveFocus := false;
|
1036 |
if ValidDataSet and (dgpCancelOnExit in Options) and
|
1037 |
InsertCancelable then
|
1038 |
begin
|
1039 |
FDataLink.DataSet.Cancel;
|
1040 |
end;
|
1041 |
inherited DoExit;
|
1042 |
end;
|
1043 |
|
1044 |
procedure TDBControlGrid.DoGridResize;
|
1045 |
begin
|
1046 |
if Columns.Count = 0 then Exit;
|
1047 |
|
1048 |
if ColCount > 1 then
|
1049 |
Columns[0].Width := ClientWidth - ColWidths[0]
|
1050 |
else
|
1051 |
Columns[0].Width := ClientWidth;
|
1052 |
|
1053 |
FRowCache.Width := Columns[0].Width;
|
1054 |
UpdateDrawPanelBounds(Row);
|
1055 |
end;
|
1056 |
|
1057 |
procedure TDBControlGrid.DoOnResize;
|
1058 |
begin
|
1059 |
inherited DoOnResize;
|
1060 |
DoGridResize;
|
1061 |
end;
|
1062 |
|
1063 |
procedure TDBControlGrid.DoScrollDataSet(Data: PtrInt);
|
1064 |
begin
|
1065 |
if AppDestroying in Application.Flags then Exit;
|
1066 |
FDataLink.DataSet.MoveBy(integer(Data) - FDataLink.DataSet.RecNo);
|
1067 |
end;
|
1068 |
|
1069 |
procedure TDBControlGrid.DrawAllRows;
|
1070 |
begin
|
1071 |
inherited DrawAllRows;
|
1072 |
if ValidDataSet and FDatalink.DataSet.Active then
|
1073 |
begin
|
1074 |
if FInCacheRefresh and not FCacheRefreshQueued then
|
1075 |
{We are at the end of a cache refresh cycle}
|
1076 |
begin
|
1077 |
if FRequiredRecNo > 0 then
|
1078 |
begin
|
1079 |
if FRequiredRecNo <> FDataLink.DataSet.RecNo then
|
1080 |
Application.QueueAsyncCall(@DoScrollDataSet,FRequiredRecNo);
|
1081 |
FRequiredRecNo := 0;
|
1082 |
end
|
1083 |
else
|
1084 |
if FDrawRow <> FSelectedRow then
|
1085 |
Application.QueueAsyncCall(@DoMoveRecord,FSelectedRow);
|
1086 |
end;
|
1087 |
FInCacheRefresh := false;
|
1088 |
end;
|
1089 |
end;
|
1090 |
|
1091 |
procedure TDBControlGrid.DrawRow(ARow: Integer);
|
1092 |
begin
|
1093 |
if (ARow>=FixedRows) and FDataLink.Active then
|
1094 |
FDrawingActiveRecord := (ARow = FDrawRow)
|
1095 |
else
|
1096 |
FDrawingActiveRecord := False;
|
1097 |
inherited DrawRow(ARow);
|
1098 |
end;
|
1099 |
|
1100 |
procedure TDBControlGrid.DrawCell(aCol, aRow: Integer; aRect: TRect;
|
1101 |
aState: TGridDrawState);
|
1102 |
|
1103 |
function GetDatasetState: TDataSetState;
|
1104 |
begin
|
1105 |
if ValidDataSet then
|
1106 |
result := FDataLink.DataSet.State
|
1107 |
else
|
1108 |
result := dsInactive;
|
1109 |
end;
|
1110 |
|
1111 |
var
|
1112 |
DataCol: Integer;
|
1113 |
begin
|
1114 |
PrepareCanvas(aCol, aRow, aState);
|
1115 |
|
1116 |
if aCol < FixedCols then
|
1117 |
DrawIndicator(Canvas,aRow, aRect,GetDataSetState,false)
|
1118 |
else
|
1119 |
if not FDrawingActiveRecord and FDataLink.Active then
|
1120 |
DoDrawRow(aRow,aRect,aState);
|
1121 |
{if we are drawing the active record then this is rendered by the Draw Panel
|
1122 |
i.e. a child control - so we need do nothing here}
|
1123 |
|
1124 |
DrawCellGrid(aCol, aRow, aRect, aState);
|
1125 |
end;
|
1126 |
|
1127 |
procedure TDBControlGrid.DrawIndicator(ACanvas: TCanvas; aRow: integer;
|
1128 |
R: TRect; Opt: TDataSetState; MultiSel: boolean);
|
1129 |
var
|
1130 |
dx,dy, x, y: Integer;
|
1131 |
procedure CenterY;
|
1132 |
begin
|
1133 |
y := R.Top + (R.Bottom-R.Top) div 2;
|
1134 |
end;
|
1135 |
procedure CenterX;
|
1136 |
begin
|
1137 |
X := R.Left + (R.Right-R.Left) div 2;
|
1138 |
end;
|
1139 |
procedure DrawEdit(clr: Tcolor);
|
1140 |
begin
|
1141 |
ACanvas.Pen.Color := clr;
|
1142 |
CenterY;
|
1143 |
CenterX;
|
1144 |
ACanvas.MoveTo(X-2, Y-Dy);
|
1145 |
ACanvas.LineTo(X+3, Y-Dy);
|
1146 |
ACanvas.MoveTo(X, Y-Dy);
|
1147 |
ACanvas.LineTo(X, Y+Dy);
|
1148 |
ACanvas.MoveTo(X-2, Y+Dy);
|
1149 |
ACanvas.LineTo(X+3, Y+Dy);
|
1150 |
end;
|
1151 |
procedure DrawBrowse;
|
1152 |
begin
|
1153 |
ACanvas.Brush.Color:=clBlack;
|
1154 |
ACanvas.Pen.Color:=clBlack;
|
1155 |
CenterY;
|
1156 |
x:= R.Left+3;
|
1157 |
if MultiSel then begin
|
1158 |
if BiDiMode = bdRightToLeft then begin
|
1159 |
ACanvas.Polyline([point(x+dx,y-dy), point(x,y),point(x+dx,y+dy), point(x+dx,y+dy-1)]);
|
1160 |
ACanvas.Polyline([point(x+dx,y-dy+1), point(x+1,y),point(x+dx,y+dy-1), point(x+dx,y+dy-2)]);
|
1161 |
CenterX;
|
1162 |
Dec(X,3);
|
1163 |
ACanvas.Ellipse(Rect(X+dx-2,Y-2,X+dx+2,Y+2));
|
1164 |
end else begin
|
1165 |
ACanvas.Polyline([point(x,y-dy), point(x+dx,y),point(x,y+dy), point(x,y+dy-1)]);
|
1166 |
ACanvas.Polyline([point(x,y-dy+1),point(x+dx-1,y),point(x, y+dy-1), point(x,y+dy-2)]);
|
1167 |
CenterX;
|
1168 |
Dec(X,3);
|
1169 |
ACanvas.Ellipse(Rect(X-2,Y-2,X+2,Y+2));
|
1170 |
end;
|
1171 |
end else begin
|
1172 |
if BiDiMode = bdRightToLeft then
|
1173 |
ACanvas.Polygon([point(x,y),point(x+dx,y-dy),point(x+dx, y+dy),point(x,y)])
|
1174 |
else
|
1175 |
ACanvas.Polygon([point(x,y-dy),point(x+dx,y),point(x, y+dy),point(x,y-dy)]);
|
1176 |
end;
|
1177 |
end;
|
1178 |
|
1179 |
begin
|
1180 |
ACanvas.Brush.Color := FixedColor;
|
1181 |
ACanvas.FillRect(R);
|
1182 |
if aRow <> Row then Exit;
|
1183 |
|
1184 |
dx := 6;
|
1185 |
dy := 6;
|
1186 |
case Opt of
|
1187 |
dsBrowse:
|
1188 |
DrawBrowse;
|
1189 |
dsEdit:
|
1190 |
if FDrawingActiveRecord then
|
1191 |
DrawEdit(clBlack)
|
1192 |
else
|
1193 |
DrawBrowse;
|
1194 |
dsInsert:
|
1195 |
if FDrawingActiveRecord then
|
1196 |
DrawEdit(clGreen)
|
1197 |
else
|
1198 |
DrawBrowse;
|
1199 |
else
|
1200 |
if MultiSel then begin
|
1201 |
ACanvas.Brush.Color:=clBlack;
|
1202 |
ACanvas.Pen.Color:=clBlack;
|
1203 |
CenterX;
|
1204 |
CenterY;
|
1205 |
ACanvas.Ellipse(Rect(X-3,Y-3,X+3,Y+3));
|
1206 |
end;
|
1207 |
end; end;
|
1208 |
|
1209 |
procedure TDBControlGrid.GridMouseWheel(shift: TShiftState; Delta: Integer);
|
1210 |
begin
|
1211 |
inherited GridMouseWheel(shift, Delta);
|
1212 |
self.SetFocus;
|
1213 |
if ValidDataSet then
|
1214 |
FDataLink.DataSet.MoveBy(Delta);
|
1215 |
end;
|
1216 |
|
1217 |
procedure TDBControlGrid.KeyDown(var Key: Word; Shift: TShiftState);
|
1218 |
type
|
1219 |
TOperation=(opMoveBy,opCancel,opAppend,opInsert,opDelete);
|
1220 |
var
|
1221 |
DeltaCol,DeltaRow: Integer;
|
1222 |
|
1223 |
procedure DoOnKeyDown;
|
1224 |
begin
|
1225 |
if Assigned(OnKeyDown) then
|
1226 |
OnKeyDown(Self, Key, Shift);
|
1227 |
end;
|
1228 |
|
1229 |
procedure DoOperation(AOper: TOperation; Arg: Integer = 0);
|
1230 |
begin
|
1231 |
self.SetFocus;
|
1232 |
case AOper of
|
1233 |
opMoveBy:
|
1234 |
FDatalink.DataSet.MoveBy(Arg);
|
1235 |
opCancel:
|
1236 |
begin
|
1237 |
FDatalink.Dataset.Cancel;
|
1238 |
end;
|
1239 |
opAppend:
|
1240 |
FDatalink.Dataset.Append;
|
1241 |
opInsert:
|
1242 |
FDatalink.Dataset.Insert;
|
1243 |
opDelete:
|
1244 |
FDatalink.Dataset.Delete;
|
1245 |
end;
|
1246 |
end;
|
1247 |
|
1248 |
function doVKDown: boolean;
|
1249 |
begin
|
1250 |
if InsertCancelable then
|
1251 |
begin
|
1252 |
if IsEOF then
|
1253 |
result:=true
|
1254 |
else begin
|
1255 |
doOperation(opCancel);
|
1256 |
result := false;
|
1257 |
end;
|
1258 |
end else begin
|
1259 |
result:=false;
|
1260 |
doOperation(opMoveBy, 1);
|
1261 |
if GridCanModify and FDataLink.EOF then begin
|
1262 |
if not (dgpDisableInsert in Options) then
|
1263 |
doOperation(opAppend);
|
1264 |
end
|
1265 |
end;
|
1266 |
end;
|
1267 |
|
1268 |
function DoVKUP: boolean;
|
1269 |
begin
|
1270 |
if InsertCancelable then
|
1271 |
doOperation(opCancel)
|
1272 |
else begin
|
1273 |
doOperation(opMoveBy, -1);
|
1274 |
end;
|
1275 |
result := FDatalink.DataSet.BOF;
|
1276 |
end;
|
1277 |
|
1278 |
|
1279 |
|
1280 |
begin
|
1281 |
case Key of
|
1282 |
VK_DOWN:
|
1283 |
begin
|
1284 |
DoOnKeyDown;
|
1285 |
if (Key<>0) and ValidDataset then begin
|
1286 |
doVKDown;
|
1287 |
Key := 0;
|
1288 |
end;
|
1289 |
end;
|
1290 |
|
1291 |
VK_UP:
|
1292 |
begin
|
1293 |
doOnKeyDown;
|
1294 |
if (Key<>0) and ValidDataset then begin
|
1295 |
doVKUp;
|
1296 |
key := 0;
|
1297 |
end;
|
1298 |
end;
|
1299 |
|
1300 |
VK_NEXT:
|
1301 |
begin
|
1302 |
doOnKeyDown;
|
1303 |
if (Key<>0) and ValidDataset then begin
|
1304 |
doOperation(opMoveBy, VisibleRowCount);
|
1305 |
Key := 0;
|
1306 |
end;
|
1307 |
end;
|
1308 |
|
1309 |
VK_PRIOR:
|
1310 |
begin
|
1311 |
doOnKeyDown;
|
1312 |
if (Key<>0) and ValidDataset then begin
|
1313 |
doOperation(opMoveBy, -VisibleRowCount);
|
1314 |
key := 0;
|
1315 |
end;
|
1316 |
end;
|
1317 |
|
1318 |
VK_ESCAPE:
|
1319 |
begin
|
1320 |
doOnKeyDown;
|
1321 |
if ValidDataSet then
|
1322 |
doOperation(opCancel);
|
1323 |
end;
|
1324 |
|
1325 |
VK_HOME:
|
1326 |
begin
|
1327 |
doOnKeyDown;
|
1328 |
if (Key<>0) and ValidDataSet then
|
1329 |
begin
|
1330 |
if ssCTRL in Shift then
|
1331 |
begin
|
1332 |
FDataLink.DataSet.First;
|
1333 |
Key:=0;
|
1334 |
end;
|
1335 |
end;
|
1336 |
end;
|
1337 |
|
1338 |
VK_END:
|
1339 |
begin
|
1340 |
doOnKeyDown;
|
1341 |
if Key<>0 then begin
|
1342 |
if ValidDataSet then
|
1343 |
begin
|
1344 |
if ssCTRL in shift then
|
1345 |
begin
|
1346 |
FDatalink.DataSet.Last;
|
1347 |
Key:=0;
|
1348 |
end;
|
1349 |
end;
|
1350 |
end;
|
1351 |
end;
|
1352 |
|
1353 |
end;
|
1354 |
end;
|
1355 |
|
1356 |
procedure TDBControlGrid.LinkActive(Value: Boolean);
|
1357 |
begin
|
1358 |
if not Value then
|
1359 |
begin
|
1360 |
FRowCache.ClearCache;
|
1361 |
FInCacheRefresh := false;
|
1362 |
FCacheRefreshQueued := false;
|
1363 |
Row := FixedRows;
|
1364 |
end;
|
1365 |
FRowCache.UseAlternateColors := AlternateColor <> Color;
|
1366 |
FRowCache.AltColorStartNormal := AltColorStartNormal;
|
1367 |
FLastRecordCount := 0;
|
1368 |
LayoutChanged;
|
1369 |
if Value then
|
1370 |
begin
|
1371 |
{ The problem being solved here is that TDataSet does not readily tell us
|
1372 |
when a record is deleted. We get a DataSetChanged event - but this can
|
1373 |
occur for many reasons. Only by monitoring the record count accurately
|
1374 |
can be determine when a record is deleted. To do this we need to scroll
|
1375 |
the whole dataset to the end when the dataset is activated. Not desirable
|
1376 |
with large datasets - but a fix to TDataSet is needed to avoid this.
|
1377 |
}
|
1378 |
FDataLink.DataSet.DisableControls;
|
1379 |
try
|
1380 |
FDataLink.DataSet.Last;
|
1381 |
FLastRecordCount := FDataLink.DataSet.RecordCount;
|
1382 |
if not FDefaultPositionAtEnd then
|
1383 |
FDataLink.DataSet.First;
|
1384 |
FRequiredRecNo := FDataLink.DataSet.RecNo;
|
1385 |
finally
|
1386 |
FDataLink.DataSet.EnableControls;
|
1387 |
end;
|
1388 |
end;
|
1389 |
end;
|
1390 |
|
1391 |
procedure TDBControlGrid.LayoutChanged;
|
1392 |
begin
|
1393 |
if csDestroying in ComponentState then
|
1394 |
exit;
|
1395 |
BeginUpdate;
|
1396 |
try
|
1397 |
if UpdateGridCounts=0 then
|
1398 |
EmptyGrid;
|
1399 |
finally
|
1400 |
EndUpdate;
|
1401 |
end;
|
1402 |
UpdateScrollbarRange;
|
1403 |
end;
|
1404 |
|
1405 |
procedure TDBControlGrid.MouseDown(Button: TMouseButton; Shift: TShiftState; X,
|
1406 |
Y: Integer);
|
1407 |
var
|
1408 |
Gz: TGridZone;
|
1409 |
P: TPoint;
|
1410 |
procedure doMouseDown;
|
1411 |
begin
|
1412 |
// if not Focused then
|
1413 |
// SetFocus;
|
1414 |
if assigned(OnMouseDown) then
|
1415 |
OnMouseDown(Self, Button, Shift, X, Y);
|
1416 |
end;
|
1417 |
procedure doInherited;
|
1418 |
begin
|
1419 |
inherited MouseDown(Button, Shift, X, Y);
|
1420 |
end;
|
1421 |
procedure doMoveBy;
|
1422 |
begin
|
1423 |
FDatalink.DataSet.MoveBy(P.Y - Row);
|
1424 |
end;
|
1425 |
procedure doMoveToColumn;
|
1426 |
begin
|
1427 |
Col := P.X;
|
1428 |
end;
|
1429 |
procedure DoCancel;
|
1430 |
begin
|
1431 |
FDatalink.Dataset.cancel;
|
1432 |
end;
|
1433 |
begin
|
1434 |
if (csDesigning in componentState) or not ValidDataSet then begin
|
1435 |
exit;
|
1436 |
end;
|
1437 |
self.SetFocus;
|
1438 |
|
1439 |
{ if not MouseButtonAllowed(Button) then begin
|
1440 |
doInherited;
|
1441 |
exit;
|
1442 |
end;}
|
1443 |
|
1444 |
Gz:=MouseToGridZone(X,Y);
|
1445 |
CacheMouseDown(X,Y);
|
1446 |
case Gz of
|
1447 |
gzInvalid:
|
1448 |
doMouseDown;
|
1449 |
|
1450 |
gzFixedCells, gzFixedCols:
|
1451 |
doInherited;
|
1452 |
else
|
1453 |
begin
|
1454 |
|
1455 |
P:=MouseToCell(Point(X,Y));
|
1456 |
if Gz=gzFixedRows then
|
1457 |
P.X := Col;
|
1458 |
|
1459 |
if P.Y=Row then begin
|
1460 |
//doAcceptValue;
|
1461 |
|
1462 |
if not (ssCtrl in Shift) then
|
1463 |
begin
|
1464 |
if gz=gzFixedRows then
|
1465 |
doMouseDown
|
1466 |
else
|
1467 |
doInherited;
|
1468 |
end;
|
1469 |
|
1470 |
end else begin
|
1471 |
doMouseDown;
|
1472 |
if ValidDataSet then begin
|
1473 |
if InsertCancelable and IsEOF then
|
1474 |
doCancel;
|
1475 |
doMoveBy;
|
1476 |
end;
|
1477 |
end;
|
1478 |
end;
|
1479 |
end;
|
1480 |
end;
|
1481 |
|
1482 |
procedure TDBControlGrid.MouseUp(Button: TMouseButton; Shift: TShiftState; X,
|
1483 |
Y: Integer);
|
1484 |
begin
|
1485 |
inherited MouseUp(Button, Shift, X, Y);
|
1486 |
FLastMouse.X := X;
|
1487 |
FLastMouse.Y := Y;
|
1488 |
FLastMouseButton := Button;
|
1489 |
FLastMouseShiftState := Shift;
|
1490 |
Application.QueueAsyncCall(@DoSendMouseClicks,0);
|
1491 |
end;
|
1492 |
|
1493 |
procedure TDBControlGrid.MoveSelection;
|
1494 |
begin
|
1495 |
inherited MoveSelection;
|
1496 |
InvalidateRow(Row);
|
1497 |
end;
|
1498 |
|
1499 |
procedure TDBControlGrid.Notification(AComponent: TComponent;
|
1500 |
Operation: TOperation);
|
1501 |
begin
|
1502 |
inherited Notification(AComponent, Operation);
|
1503 |
if (Operation = opRemove) and
|
1504 |
(AComponent = FDrawPanel) then FDrawPanel := nil;
|
1505 |
end;
|
1506 |
|
1507 |
procedure TDBControlGrid.PrepareCanvas(aCol, aRow: Integer; aState: TGridDrawState
|
1508 |
);
|
1509 |
begin
|
1510 |
inherited PrepareCanvas(aCol, aRow, aState);
|
1511 |
|
1512 |
if gdFixed in aState then
|
1513 |
begin
|
1514 |
if gdHot in aState then
|
1515 |
Canvas.Brush.Color := FixedHotColor
|
1516 |
else
|
1517 |
Canvas.Brush.Color := GetColumnColor(aCol, gdFixed in AState);
|
1518 |
end;
|
1519 |
|
1520 |
if (not FDatalink.Active) and ((gdSelected in aState) or (gdFocused in aState)) then
|
1521 |
Canvas.Brush.Color := Self.Color;
|
1522 |
|
1523 |
end;
|
1524 |
|
1525 |
procedure TDBControlGrid.ResetSizes;
|
1526 |
begin
|
1527 |
LayoutChanged;
|
1528 |
inherited ResetSizes;
|
1529 |
DoGridResize;
|
1530 |
end;
|
1531 |
|
1532 |
procedure TDBControlGrid.SetColor(Value: TColor);
|
1533 |
begin
|
1534 |
inherited SetColor(Value);
|
1535 |
if (csDesigning in ComponentState) and assigned(FDrawPaneL) then
|
1536 |
FDrawPanel.Color := Value;
|
1537 |
end;
|
1538 |
|
1539 |
procedure TDBControlGrid.UpdateActive;
|
1540 |
var
|
1541 |
PrevRow: Integer;
|
1542 |
begin
|
1543 |
if (csDestroying in ComponentState) or
|
1544 |
(FDatalink=nil) or (not FDatalink.Active) or
|
1545 |
(FDatalink.ActiveRecord<0) then
|
1546 |
exit;
|
1547 |
|
1548 |
FDrawRow := FixedRows + FDataLink.ActiveRecord;
|
1549 |
FSelectedRecNo := FDataLink.DataSet.RecNo;
|
1550 |
PrevRow := Row;
|
1551 |
Row := FDrawRow;
|
1552 |
if not FInCacheRefresh then
|
1553 |
FSelectedRow := FDrawRow;
|
1554 |
InvalidateRow(PrevRow);
|
1555 |
SetupDrawPanel(FDrawRow);
|
1556 |
end;
|
1557 |
|
1558 |
procedure TDBControlGrid.UpdateData;
|
1559 |
begin
|
1560 |
FModified := false;
|
1561 |
end;
|
1562 |
|
1563 |
procedure TDBControlGrid.UpdateShowing;
|
1564 |
begin
|
1565 |
inherited UpdateShowing;
|
1566 |
DoGridResize
|
1567 |
end;
|
1568 |
|
1569 |
procedure TDBControlGrid.UpdateVertScrollbar(const aVisible: boolean;
|
1570 |
const aRange, aPage, aPos: Integer);
|
1571 |
begin
|
1572 |
UpdateScrollbarRange;
|
1573 |
end;
|
1574 |
|
1575 |
constructor TDBControlGrid.Create(AOwner: TComponent);
|
1576 |
begin
|
1577 |
inherited Create(AOwner);
|
1578 |
FDataLink := TDBControlGridDataLink.Create;//(Self);
|
1579 |
FRowCache := TRowCache.Create;
|
1580 |
FDataLink.OnRecordChanged:=@OnRecordChanged;
|
1581 |
FDataLink.OnDatasetChanged:=@OnDataSetChanged;
|
1582 |
FDataLink.OnDataSetOpen:=@OnDataSetOpen;
|
1583 |
FDataLink.OnDataSetClose:=@OnDataSetClose;
|
1584 |
FDataLink.OnNewDataSet:=@OnNewDataSet;
|
1585 |
FDataLink.OnInvalidDataSet:=@OnInvalidDataset;
|
1586 |
FDataLink.OnInvalidDataSource:=@OnInvalidDataSource;
|
1587 |
FDataLink.OnDataSetScrolled:=@OnDataSetScrolled;
|
1588 |
FDataLink.OnLayoutChanged:=@OnLayoutChanged;
|
1589 |
FDataLink.OnEditingChanged:=@OnEditingChanged;
|
1590 |
FDataLink.OnUpdateData:=@OnUpdateData;
|
1591 |
FDataLink.OnCheckBrowseMode := @OnCheckBrowseMode;
|
1592 |
FDataLink.VisualControl:= True;
|
1593 |
ScrollBars := ssAutoVertical;
|
1594 |
FOptions := [dgpIndicator];
|
1595 |
FixedCols := 1;
|
1596 |
ColCount := 1;
|
1597 |
FixedRows := 0;
|
1598 |
RowCount := 1;
|
1599 |
ColWidths[0] := 12;
|
1600 |
Columns.Add.ReadOnly := true; {Add Dummy Column for Panel}
|
1601 |
DoGridResize;
|
1602 |
if not (csDesigning in ComponentState) then
|
1603 |
Application.AddOnKeyDownBeforeHandler(@KeyDownHandler,false);
|
1604 |
end;
|
1605 |
|
1606 |
destructor TDBControlGrid.Destroy;
|
1607 |
begin
|
1608 |
if assigned(FDataLink) then
|
1609 |
begin
|
1610 |
FDataLink.OnDataSetChanged:=nil;
|
1611 |
FDataLink.OnRecordChanged:=nil;
|
1612 |
FDataLink.Free;
|
1613 |
end;
|
1614 |
if assigned(FRowCache) then FRowCache.Free;
|
1615 |
inherited Destroy;
|
1616 |
end;
|
1617 |
|
1618 |
function TDBControlGrid.MouseToRecordOffset(const x, y: Integer;
|
1619 |
out RecordOffset: Integer): TGridZone;
|
1620 |
var
|
1621 |
aCol,aRow: Integer;
|
1622 |
begin
|
1623 |
Result := MouseToGridZone(x, y);
|
1624 |
|
1625 |
RecordOffset := 0;
|
1626 |
|
1627 |
if (Result=gzInvalid) or (Result=gzFixedCells) then
|
1628 |
exit;
|
1629 |
|
1630 |
MouseToCell(x, y, aCol, aRow);
|
1631 |
|
1632 |
if (Result=gzFixedRows) or (Result=gzNormal) then
|
1633 |
RecordOffset := aRow - Row;
|
1634 |
|
1635 |
if (Result=gzFixedCols) or (Result=gzNormal) then begin
|
1636 |
aRow := ColumnIndexFromGridColumn(aCol);
|
1637 |
end;
|
1638 |
end;
|
1639 |
|
1640 |
function TDBControlGrid.ExecuteAction(AAction: TBasicAction): Boolean;
|
1641 |
begin
|
1642 |
Result := (DataLink <> nil)
|
1643 |
and DataLink.ExecuteAction(AAction);
|
1644 |
end;
|
1645 |
|
1646 |
function TDBControlGrid.UpdateAction(AAction: TBasicAction): Boolean;
|
1647 |
begin
|
1648 |
Result := (DataLink <> nil)
|
1649 |
and DataLink.UpdateAction(AAction);
|
1650 |
end;
|
1651 |
|
1652 |
end.
|