在StringGrid中强制选择单元格 – Delphi
发布时间:2020-12-15 09:28:51 所属栏目:大数据 来源:网络整理
导读:是否可以强制选择我的StrinGrid? 我想只允许用户水平选择单元格,即使鼠标在选择时可以上下移动,我想要stringgrid只在有MouseDown的行上显示选择. 因此,当用户想要选择一系列单元格时,他将单击鼠标,向右(或向左)拖动鼠标,同时查看如何一个接一个地选择单元格
是否可以强制选择我的StrinGrid?
我想只允许用户水平选择单元格,即使鼠标在选择时可以上下移动,我想要stringgrid只在有MouseDown的行上显示选择. 因此,当用户想要选择一系列单元格时,他将单击鼠标,向右(或向左)拖动鼠标,同时查看如何一个接一个地选择单元格,然后是MouseUp事件. 在拖动时,我不希望用户在移动鼠标时看到其他行(而不是拖动开始的行). 我假设我应该在StringGrid的onMouseMove中做一些事情……但是怎么样? 到目前为止我的代码是: // this draws a focus rect around the selected cell (DefaultDrawing=false) procedure TForm2.sgDrawCell(Sender: TObject; ACol,ARow: Integer; Rect: TRect; State: TGridDrawState); begin if (gdFocused in State)or(gdSelected in State) then begin sg.Canvas.Pen.Color:=$00FFEECC; sg.Canvas.MoveTo(Rect.Left,Rect.Top); sg.Canvas.LineTo(Rect.Right,Rect.Bottom); sg.Canvas.LineTo(Rect.Left,Rect.Top); end else begin sg.Canvas.Brush.Color:=clWhite; sg.Canvas.FillRect(Rect); end; end; procedure TForm2.sgMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X,Y: Integer); begin myrow:=sg.Row; mycol:=sg.Col; end; procedure TForm2.sgMouseMove(Sender: TObject; Shift: TShiftState; X,Y: Integer); begin sg.Row:=myrow; end; 可能吗? 解决方法
是的,它是可行的.我没有控制网格,而是在选择时设置鼠标移动的界限:
使用Windows.ClipCursor; 首先在mouseDown上计算有效边界: procedure TForm8.StringGrid1MouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X,Y: Integer); var StringGrid: TStringGrid; GridRect: TGridRect; Row: Integer; CursorClipArea: TRect; BoundsRect: TRect; begin // The Sender argument to StringGrid1Click is actually the StringGrid itself,// and the following "as" cast lets you assign it to the StringGrid local variable // in a "type-safe" way,and access its properties and methods via the temporary variable StringGrid := Sender as TStringGrid; // Now we can retrieve the use selection GridRect := StringGrid.Selection; // and hence the related GridRect // btw,the value returned for Row automatically takes account of // the number of FixedRows,if any,of the grid Row := GridRect.Top; //Then set the bounds of the mouse movement. //ClipCursor uses Screen Coordinates to you'll have to use ClientToScreen CursorClipArea.TopLeft := StringGrid.ClientToScreen(StringGrid.CellRect(StringGrid.FixedCols,Row).TopLeft); CursorClipArea.BottomRight := StringGrid.ClientToScreen(StringGrid.CellRect(StringGrid.ColCount - 1,Row).BottomRight); Windows.ClipCursor(@CursorClipArea) end; //Then on mouse up release the mouse procedure TForm8.StringGrid1MouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X,Y: Integer); begin //Release mouse Windows.ClipCursor(nil) end; (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |