是否可以在我的 StrinGrid 中强制进行选择? 我想只允许用户水平选择单元格,即使鼠标在选择时可能上下移动,我想 stringgrid 仅在有 MouseDown 的行上显示选择。 因此,当用户想要选择一系列单元格时,他会单击鼠标,向右(或向左)拖动鼠标,同时查看如何逐个选择单元格,然后出现 MouseUp 事件。 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)被选中。 我想我应该在 StringGrid 的 onMouseMove 中做一些事情......但是怎么做?
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.Top);
sg.Canvas.LineTo(Rect.Right,Rect.Bottom);
sg.Canvas.LineTo(Rect.Left,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;
这可能吗? 我怎样才能做到这一点?
最佳答案
是的,这是可能的。我不会控制网格,而是在选择时设置鼠标移动的边界: 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;
关于delphi - 在 StringGrid 中强制选择单元格 - Delphi,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31691810/