Delphi XE中的GridPanel问题

Question

GridPanel有问题！我做错了什么吗？第2列的第一行是调整窗体大小的错误。使用Delphi XE 6和10.2.2进行了测试！在表单中放置一个TGridPanel，并将"Align“设置为"alClient”。启动窗体并调整窗体大小。

尝试以下代码：

procedure TForm5.Button1Click(Sender: TObject);
var
  Col,Row: Integer;
  CI: TControlItem;
  Panel: TPanel;
  Rows, Cols: Integer;
begin
  GridPanel1.RowCollection.BeginUpdate;
  GridPanel1.ColumnCollection.BeginUpdate;
  GridPanel1.ColumnCollection.BeginUpdate;

  GridPanel1.RowCollection.Clear;
  GridPanel1.ColumnCollection.Clear;

  Rows := 6;
  Cols := 4;

  for Row := 1 to Rows do
  begin
    with GridPanel1.RowCollection.Add do
    begin
      SizeStyle := ssPercent;
      Value := 100 / Rows;
    end;
  end;

  for Col := 1 to Cols do
  begin
    with GridPanel1.ColumnCollection.Add do
    begin
      SizeStyle := ssPercent;
      Value := 100 / Cols;
    end;
  end;

  for Row := 0 to GridPanel1.RowCollection.Count - 1 do
  begin
    for Col := 0 to GridPanel1.ColumnCollection.Count - 1 do
    begin
      Panel := TPanel.Create(Self);
      Panel.Parent := GridPanel1;
      CI := GridPanel1.ControlCollection.Add;
      CI.Column := Col;
      CI.Row := Row;
      Panel.Caption := 'Row ' + Row.ToString + ' Col ' + Col.ToString;
      CI.Control := Panel;
    end;
  end;
  GridPanel1.ColumnCollection.EndUpdate;
  GridPanel1.RowCollection.EndUpdate;
  GridPanel1.ColumnCollection.EndUpdate;
end;

Answer 1

正如Tom Brunberg所指出的，设置Panel.Parent会将它们放在控件集合中，并对其进行管理。

  for Row := 0 to GridPanel1.RowCollection.Count - 1 do
  begin
    for Col := 0 to GridPanel1.ColumnCollection.Count - 1 do
    begin
      Panel := TPanel.Create(Self);
      Panel.Parent := GridPanel1;
      Panel.Caption := 'Row ' + Row.ToString + ' Col ' + Col.ToString;
    end;
  end;

您的代码使集合以48个控件结束，而不是24个。

form1.Caption := 'ControlCollection.Count:' + IntToStr(GridPanel1.ControlCollection.Count);