delphi 7 TImage 和 TImageList

发布于 2024-10-05 08:27:03 字数 321 浏览 1 评论 0原文

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代码

procedure TForm1.Image1Click(Sender: TObject);
begin
  inc(i);
  ImageList1.GetIcon(i mod 4,Image1.Picture.Icon);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  i:=0;
  ImageList1.GetIcon(i mod 4,Image1.Picture.Icon);
end;

我如何从列表中拉伸图标以适应Image1的大小？

原文

let i be integer private

the code

procedure TForm1.Image1Click(Sender: TObject);
begin
  inc(i);
  ImageList1.GetIcon(i mod 4,Image1.Picture.Icon);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  i:=0;
  ImageList1.GetIcon(i mod 4,Image1.Picture.Icon);
end;

how do i stretch the icon from the list to fit the size of Image1?

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等往事风中吹 2024-10-12 08:27:03

procedure TForm1.Image1Click(Sender: TObject);
var
  icon: TIcon;
begin
  inc(i);
  Image1.Canvas.FillRect(ClientRect);      
  icon := TIcon.Create;
  try
    ImageList1.GetIcon(i mod 4, icon);
    DrawIconEx(Image1.Canvas.Handle, 0, 0, icon.Handle, Image1.Width, Image1.Height, 0, 0, DI_NORMAL);
  finally
    icon.Free;
  end
end;

更好的方法

有时使用 Delphi 有点尴尬，因为 VCL 和本机 Windows API 之间的合作程度有些不清楚。如果上面的代码不起作用（我感觉它正在泄漏图标），这里有一个纯本机方法（使用 ImgList、CommCtrl）：

procedure TForm1.Image1Click(Sender: TObject);
var
  icon: HICON;
begin
  inc(i);
  Image1.Canvas.FillRect(ClientRect);
  icon := ImageList_GetIcon(ImageList1.Handle, i mod 4, ILD_NORMAL);
  try
    DrawIconEx(Image1.Canvas.Handle, 0, 0, icon, Image1.Width, Image1.Height, 0, 0, DI_NORMAL);
  finally
    DestroyIcon(icon);
  end
end;

procedure TForm1.Image1Click(Sender: TObject);
var
  icon: TIcon;
begin
  inc(i);
  Image1.Canvas.FillRect(ClientRect);      
  icon := TIcon.Create;
  try
    ImageList1.GetIcon(i mod 4, icon);
    DrawIconEx(Image1.Canvas.Handle, 0, 0, icon.Handle, Image1.Width, Image1.Height, 0, 0, DI_NORMAL);
  finally
    icon.Free;
  end
end;

Better Approach

Sometimes it is a bit awkward to use Delphi since the extent of cooperation between the VCL and the native Windows API is somewhat unclear. If the above code doesn't work (I get the feeling it is leaking icons), here is a pure native approach (uses ImgList, CommCtrl):

procedure TForm1.Image1Click(Sender: TObject);
var
  icon: HICON;
begin
  inc(i);
  Image1.Canvas.FillRect(ClientRect);
  icon := ImageList_GetIcon(ImageList1.Handle, i mod 4, ILD_NORMAL);
  try
    DrawIconEx(Image1.Canvas.Handle, 0, 0, icon, Image1.Width, Image1.Height, 0, 0, DI_NORMAL);
  finally
    DestroyIcon(icon);
  end
end;

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