delphi 防止RTL TListView镜像复选框和/或图形

yqkkidmi  于 2022-11-23  发布在  其他
关注(0)|答案(1)|浏览(151)

我试图让ListView的列从右到左显示。这已经是asked and answered。但问题是关于图标和复选框。当我用SetWindowLong创建ListView RTL时，它也镜像了图形和复选框，这是不希望的。我可以用编辑工具镜像图形，麻烦但可行，但我不知道如何处理复选框。

我想这两个原因是一样的，所以我搜索了一下，发现了一篇关于Microsoft Docs中RTL布局的文章。在 Activating Mirroring per Device Context 部分，它指出了图形问题。它建议用LAYOUT_RTL和LAYOUT_BITMAPORIENTATIONPRESERVED标志更改DC的布局风格。
这是我结合文章中建议的方法和上面提到的答案实现的函数：

const
  LAYOUT_RTL = 1;
  LAYOUT_BITMAPORIENTATIONPRESERVED = 8;

function GetLayout(DC: HDC): DWORD; stdcall; external 'gdi32.dll';
function SetLayout(DC: HDC; dwLayout: DWORD): DWORD; stdcall; external 'gdi32.dll';

procedure MakeRTL(const Handle: HWND);
var
  DC: HDC;
begin
  SetWindowLong(Handle, GWL_EXSTYLE,
    GetWindowLong(Handle, GWL_EXSTYLE) or WS_EX_LAYOUTRTL);

  DC := GetWindowDC(Handle);
  if DC <> 0 then
    SetLayout(DC, GetLayout(DC) or LAYOUT_RTL or LAYOUT_ORIENTATIONMASK);

  InvalidateRect(Handle, nil, True);
end;

但这并没有改变什么。我试着阻止它们中的任何一个，改变它们的顺序，改变不同的地方来调用它，但没有成功。
现在的问题是，如何使ListView的列从右向左显示，而不镜像图形或复选框？
我使用的是Win10 x64和 Delphi 2010。
下面是我 Delphi 代码，如果你想重现这个问题：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, ImgList, StdCtrls, CommCtrl, ShellAPI;

type
  TForm1 = class(TForm)
    ListView1: TListView;
    ImageList1: TImageList;
    ListView2: TListView;
    Button1: TButton;
    Label1: TLabel;
    procedure FormActivate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Label1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

const
  LAYOUT_RTL = 1;
  LAYOUT_BTT = 2;
  LAYOUT_VBH = 4;
  LAYOUT_ORIENTATIONMASK = LAYOUT_RTL or LAYOUT_BTT or LAYOUT_VBH;
  LAYOUT_BITMAPORIENTATIONPRESERVED = 8;

function GetLayout(DC: HDC): DWORD; stdcall; external 'gdi32.dll';
function SetLayout(DC: HDC; dwLayout: DWORD): DWORD; stdcall; external 'gdi32.dll';

procedure MakeRTL(const Handle: HWND);
var
  DC: HDC;
begin
  SetWindowLong(Handle, GWL_EXSTYLE,
    GetWindowLong(Handle, GWL_EXSTYLE) or WS_EX_LAYOUTRTL);

  DC := GetWindowDC(Handle);
  if DC <> 0 then
    SetLayout(DC, GetLayout(DC) or LAYOUT_RTL or LAYOUT_ORIENTATIONMASK);

  InvalidateRect(Handle, nil, True);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  MakeRTL(ListView_GetHeader(ListView1.Handle));
  MakeRTL(ListView1.Handle);
end;

procedure TForm1.FormActivate(Sender: TObject);
var
  I: Integer;
begin
  for I := 0 to ListView1.Items.Count - 1 do
  begin
    ListView1.Items[I].Checked := True;
    ListView2.Items[I].Checked := True;
  end;
end;

procedure TForm1.Label1Click(Sender: TObject);
begin
  ShellExecute(0, 'open', 'https://icons8.com/icons/set/check', '', '', SW_SHOWNORMAL);
end;

end.

dfm：

object Form1: TForm1
  Left = 0
  Top = 0
  BiDiMode = bdLeftToRight
  Caption = 'Form1'
  ClientHeight = 169
  ClientWidth = 353
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  ParentBiDiMode = False
  OnActivate = FormActivate
  PixelsPerInch = 96
  TextHeight = 13
  object Label1: TLabel
    Left = 277
    Top = 128
    Width = 47
    Height = 26
    Cursor = crHandPoint
    Alignment = taCenter
    Caption = 'graphics by Icons8'
    Font.Charset = DEFAULT_CHARSET
    Font.Color = clBlue
    Font.Height = -11
    Font.Name = 'Tahoma'
    Font.Style = [fsUnderline]
    ParentFont = False
    WordWrap = True
    OnClick = Label1Click
  end
  object ListView1: TListView
    Left = 8
    Top = 8
    Width = 250
    Height = 73
    Checkboxes = True
    Columns = <
      item
        Caption = 'Cap'
        Width = 100
      end
      item
        Caption = 'Sub1'
        Width = 100
      end>
    Items.ItemData = {
      03620000000200000000000000FFFFFFFFFFFFFFFF01000000FFFFFFFF000000
      00054900740065006D00310005500072006F007000310001000000FFFFFFFFFF
      FFFFFF01000000FFFFFFFF00000000054900740065006D00320005500072006F
      0070003200FFFFFFFF}
    LargeImages = ImageList1
    SmallImages = ImageList1
    TabOrder = 0
    ViewStyle = vsReport
  end
  object ListView2: TListView
    Left = 8
    Top = 87
    Width = 250
    Height = 73
    Checkboxes = True
    Columns = <
      item
        Caption = 'Cap'
        Width = 100
      end
      item
        Caption = 'Sub1'
        Width = 100
      end>
    Items.ItemData = {
      03620000000200000000000000FFFFFFFFFFFFFFFF01000000FFFFFFFF000000
      00054900740065006D00310005500072006F007000310001000000FFFFFFFFFF
      FFFFFF01000000FFFFFFFF00000000054900740065006D00320005500072006F
      0070003200FFFFFFFF}
    SmallImages = ImageList1
    TabOrder = 1
    ViewStyle = vsReport
  end
  object Button1: TButton
    Left = 264
    Top = 8
    Width = 75
    Height = 25
    Caption = 'RTL'
    TabOrder = 2
    OnClick = Button1Click
  end
  object ImageList1: TImageList
    ColorDepth = cd32Bit
    DrawingStyle = dsTransparent
    Left = 272
    Top = 40
    Bitmap = {
      494C0101020008003C0010001000FFFFFFFF2110FFFFFFFFFFFFFFFF424D3600
      0000000000003600000028000000400000001000000001002000000000000010
      0000000000000000000000000000000000000000000000000000000000000000
      0000000000000000000000000000000000000000000000000000000000000000
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      0000000000000000000000000000000000000000000000000000000000000000
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      0000000000000618062C0E3E0E741557159F1557159F0E3F0E730617062B0000
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      00000000000000000000000000000000000000000000000000001456149E218A
      21FE218B21FF218B21FF218B21FF218B21FF218B21FF218B21FF218B21FF218B
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  end
end
delphi

1条答案

按热度按时间
fd3cxomn

fd3cxomn1#

调用没有效果的原因是您检索到的设备上下文根本没有以任何方式使用。您应该怀疑这一点，因为在您当前的设计中，您甚至不能调用ReleaseDC，并且DC泄漏。
当系统通过发送绘制消息触发绘制循环时，所有绘制都在绘制循环中完成。您可以截取该消息以修改要使用的设备上下文的布局- VCL设计允许您首先检索上下文。
下面是相应修改的完整示例代码，使用插入器类修改listview的消息处理。

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, ImgList, StdCtrls, CommCtrl, ShellAPI;

type
  TListView = class(comctrls.TListView)
  protected
    procedure WMPaint(var Message: TWMPaint); message WM_PAINT;

  end;

  TForm1 = class(TForm)
    ListView1: TListView;
    ImageList1: TImageList;
    ListView2: TListView;
    Button1: TButton;
    Label1: TLabel;
    procedure FormActivate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Label1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function GetLayout(DC: HDC): DWORD; stdcall; external 'gdi32.dll';
function SetLayout(DC: HDC; dwLayout: DWORD): DWORD; stdcall; external 'gdi32.dll';

procedure MakeRTL(const Handle: HWND);
begin
  SetWindowLong(Handle, GWL_EXSTYLE,
    GetWindowLong(Handle, GWL_EXSTYLE) or WS_EX_LAYOUTRTL);
  InvalidateRect(Handle, nil, True);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  MakeRTL(ListView_GetHeader(ListView1.Handle));
  MakeRTL(ListView1.Handle);
end;

procedure TForm1.FormActivate(Sender: TObject);
var
  I: Integer;
begin
  for I := 0 to ListView1.Items.Count - 1 do
  begin
    ListView1.Items[I].Checked := True;
    ListView2.Items[I].Checked := True;
  end;
end;

procedure TForm1.Label1Click(Sender: TObject);
begin
  ShellExecute(0, 'open', 'https://icons8.com/icons/set/check', '', '', SW_SHOWNORMAL);
end;

{ TListView }

const
  LAYOUT_RTL = 1;
  LAYOUT_BITMAPORIENTATIONPRESERVED = 8;

procedure TListView.WMPaint(var Message: TWMPaint);
var
  Layout: DWORD;
  PS: TPaintStruct;
begin
  Message.DC := BeginPaint(Handle, PS);
  Layout := GetLayout(Message.DC);
  if (Layout and LAYOUT_RTL) <> 0 then
    SetLayout(Message.DC, Layout or LAYOUT_BITMAPORIENTATIONPRESERVED);
  inherited;
  EndPaint(Handle, PS);
end;

end.
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