2

我有TGridPanel一个表单,并希望将控件添加到单击的特定“单元格”。

我可以很容易地理解这一点:

procedure TForm1.GridPanel1DblClick(Sender: TObject);
var
  P : TPoint;
  InsCol, InsRow : Integer;
begin
  P := (Sender as TGridPanel).ScreenToClient(Mouse.CursorPos);
  if (Sender as TGridPanel).ControlAtPos(P) = nil then
    begin
      InsCol := ???;
      InsRow := ???;
      (Sender as TGridPanel).ControlCollection.AddControl(MyControl, InsCol, InsRow)
    end;
end;

我可能不需要这if ControlAtPos(P) = nil then条线,但我想确保我没有在已经有一个控件的单元格中插入一个控件。

那么...我使用什么代码来获取 InsCol 和 InsRow?我一直在上下TGridPanelTControlCollection类代码,找不到任何可以从鼠标坐标给我列或行值的东西。它们似乎也不是除OnDblClick().

任何帮助将不胜感激。

编辑:将变量 Result 更改为 MyControl 以避免混淆。

4

2 回答 2

3
procedure TForm1.GridPanel1Click(Sender: TObject);
var
  P: TPoint;
  R: TRect;
  InsCol, InsRow : Integer;
begin
  P := (Sender as TGridPanel).ScreenToClient(Mouse.CursorPos);
  for InsCol := 0 to GridPanel1.ColumnCollection.Count - 1 do
  begin
    for InsRow := 0 to GridPanel1.RowCollection.Count - 1 do
    begin
      R:= GridPanel1.CellRect[InsCol,InsRow];
      if PointInRect(P,R) then
      begin
        ShowMessage (Format('InsCol = %s and InsRow = %s.',[IntToStr(InsCol), IntToStr(InsRow)]))
      end;
    end;
  end;


end;

function TForm1.PointInRect(aPoint: TPoint; aRect: TRect): boolean;
begin
  begin
    Result:=(aPoint.X >= aRect.Left  ) and
            (aPoint.X <  aRect.Right ) and
            (aPoint.Y >= aRect.Top   ) and
            (aPoint.Y <  aRect.Bottom); 
  end;
end;
于 2011-11-30T15:14:41.170 回答
0

这是 Ravaut123 方法的优化(对于较大的网格应该更快)。此函数将返回 TPoint 中的 X/Y 网格位置。如果用户点击了有效的列而不是有效的行,则仍然返回有效的列信息,行也是如此。所以它不是“全有或全无”(有效单元格或无效单元格)。此函数假定网格是“规则的”(每一列与第一列具有相同的行高,同样每一行与第一行具有相同的列宽)。如果网格不规则,那么 Ravaut123 的解决方案是更好的选择。

// APoint is a point in local coordinates for which you want to find the cell location.
function FindCellInGridPanel(AGridPanel: TGridPanel; const APoint: TPoint): TPoint;
var
  ICol, IRow : Integer;
  R : TRect;
begin
  Result.X := -1;
  Result.Y := -1;
  for ICol := 0 to AGridPanel.ColumnCollection.Count - 1 do
    begin
      R := AGridPanel.CellRect[ICol, 0];
      if (APoint.X >= R.Left) and (APoint.X <= R.Right) then
        begin
          Result.X := ICol;
          Break;
        end;
    end;
  for IRow := 0 to AGridPanel.RowCollection.Count - 1 do
    begin
      R := AGridPanel.CellRect[0, IRow];
      if (APoint.Y >= R.Top) and (APoint.Y <= R.Bottom) then
        begin
          Result.Y := IRow;
          Break;
        end;
    end;
end;
于 2011-12-02T16:01:39.927 回答