TToolbar会在一段时间后停止显示按钮标题

Question

TToolbar会在一段时间后停止显示按钮标题

mwo*_*ore 5 windows delphi vcl toolbar delphi-2010

知道为什么带有TToolButtons的TToolbar会在一段时间后停止显示按钮标题吗？在整个应用程序中自动创建的表单上的所有工具栏都会发生这种情况.即使遇到此问题,动态创建的表单上的工具栏也能正常工作.

我只在一台Windows 7笔记本上看到过这种情况.发生这种情况时不会出现错误,我无法在命令中重现问题.唯一的解决方案是重新启动应用程序.

TToolbar.ShowCaptions始终为True且永远不会更改.这在下图中也是可见的,因为当ShowCaptions为False时,图标是垂直对齐的.

之前在Windows 8 PC上发生过类似的问题.然而,这次字幕被其他文字取代.

编辑:

我能够通过调用TImageList.Change重现5-10k次来重现问题.我只有Delphi 2010,所以我不能说这是Delphi还是Windows问题.

单元:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ImgList, ComCtrls, ToolWin, StdCtrls, Gauges;

type
  TImageListHelper = class helper for TImageList
  public
    procedure DoChange;
  end;

  TForm1 = class(TForm)
    ToolBar1: TToolBar;
    ToolButton1: TToolButton;
    ToolButton2: TToolButton;
    ToolButton3: TToolButton;
    ToolButton4: TToolButton;
    ToolButton5: TToolButton;
    ToolButton6: TToolButton;
    ToolButton7: TToolButton;
    ToolButton8: TToolButton;
    ToolButton9: TToolButton;
    ToolButton10: TToolButton;
    ImageList1: TImageList;
    ProgressBar1: TProgressBar;
    procedure ToolButton1Click(Sender: TObject);
  private
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.ToolButton1Click(Sender: TObject);
begin
  repeat
    ImageList1.DoChange;
    ProgressBar1.StepIt;
    Self.Update;
  until ProgressBar1.Position >= ProgressBar1.Max;
end;

procedure TImageListHelper.DoChange;
begin
  Self.Change;
end;

end.

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形成:

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 66
  ClientWidth = 711
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  Position = poScreenCenter
  PixelsPerInch = 96
  TextHeight = 13
  object ToolBar1: TToolBar
    Left = 0
    Top = 0
    Width = 711
    Height = 41
    ButtonHeight = 36
    ButtonWidth = 71
    Caption = 'ToolBar1'
    Images = ImageList1
    ShowCaptions = True
    TabOrder = 0
    ExplicitWidth = 885
    object ToolButton1: TToolButton
      Left = 0
      Top = 0
      Caption = 'ToolButton1'
      ImageIndex = 0
      OnClick = ToolButton1Click
    end
    object ToolButton2: TToolButton
      Left = 71
      Top = 0
      Caption = 'ToolButton2'
      ImageIndex = 0
    end
    object ToolButton3: TToolButton
      Left = 142
      Top = 0
      Caption = 'ToolButton3'
      ImageIndex = 0
    end
    object ToolButton4: TToolButton
      Left = 213
      Top = 0
      Caption = 'ToolButton4'
      ImageIndex = 0
    end
    object ToolButton5: TToolButton
      Left = 284
      Top = 0
      Caption = 'ToolButton5'
      ImageIndex = 0
    end
    object ToolButton6: TToolButton
      Left = 355
      Top = 0
      Caption = 'ToolButton6'
      ImageIndex = 0
    end
    object ToolButton7: TToolButton
      Left = 426
      Top = 0
      Caption = 'ToolButton7'
      ImageIndex = 0
    end
    object ToolButton8: TToolButton
      Left = 497
      Top = 0
      Caption = 'ToolButton8'
      ImageIndex = 0
    end
    object ToolButton9: TToolButton
      Left = 568
      Top = 0
      Caption = 'ToolButton9'
      ImageIndex = 0
    end
    object ToolButton10: TToolButton
      Left = 639
      Top = 0
      Caption = 'ToolButton10'
      ImageIndex = 0
    end
  end
  object ProgressBar1: TProgressBar
    Left = 0
    Top = 49
    Width = 711
    Height = 17
    Align = alBottom
    Max = 10000
    Step = 1
    TabOrder = 1
    ExplicitTop = 48
  end
  object ImageList1: TImageList
    Left = 8
    Top = 16
    Bitmap = {
      494C010101000500040010001000FFFFFFFFFF10FFFFFFFFFFFFFFFF424D3600
      0000000000003600000028000000400000001000000001002000000000000010
      0000000000000000000000000000000000000000000000000000000000000000
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      F99F000000000000E7E7000000000000E7E7000000000000FFFF000000000000
      FFFF000000000000FFFF00000000000000000000000000000000000000000000
      000000000000}
  end
end

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Answer 1

Tom*_*erg 4

这似乎是 Delphi 2010 中的一个错误，位于function TToolBar.UpdateItem(). 该函数从第 21476 行开始。

在 Delphi XE4 中（可能已经修复了，我无法检查），以下注释和代码（Delphi 2010 中缺少）出现在函数末尾：

  // If more than 2^16 strings are TB_ADDSTRING-ed to the tool bar's string
  // pool, the Windows API assumes iString is a pointer to a null terminated
  // string, not an index in the string pool.  Therefore we have to recreate
  // the toolbar to reset the string pool so the strings display propperly.
  if Button.iString >= 65536 then
    RecreateWnd;

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将 Delphi 2010 ComCtrls.pas 的副本复制到项目文件夹中并添加上述代码，解决了测试产生的问题。

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