delphi在combobox下拉框里显示图片

var

Bitmap1, Bitmap2, Bitmap3, Bitmap4: TBitmap;

procedure TForm1.FormCreate(Sender: TObject);

begin

ComboBox1.Style := csOwnerDrawVariable;

//Set height of one item

ComboBox1.ItemHeight := 20;

//load all bitmaps

Bitmap1 := TBitmap.Create;

Bitmap1.LoadFromFile('chem16.bmp');

Bitmap2 := TBitmap.Create;

Bitmap2.LoadFromFile('chip16.bmp');

Bitmap3 := TBitmap.Create;

Bitmap3.LoadFromFile('factry16.bmp');

Bitmap4 := TBitmap.Create;

Bitmap4.LoadFromFile('skylin16.bmp');

//assign bitmaps with item objects - caption of the items: Bitmap 1 - Bitmap 4

ComboBox1.Items.AddObject('Bitmap 1', Bitmap1);

ComboBox1.Items.AddObject('Bitmap 2', Bitmap2);

ComboBox1.Items.AddObject('Bitmap 3', Bitmap3);

ComboBox1.Items.AddObject('Bitmap 4', Bitmap4);

end;

procedure TForm1.ComboBox1DrawItem(Control: TWinControl; Index: Integer;

Rect: TRect; State: TOwnerDrawState);

var

Bitmap: TBitmap;

Offset: Integer;

begin

offset := 0;

with ComboBox1.Canvas do

begin

FillRect(Rect);

Bitmap := TBitmap(ComboBox1.Items.Objects[Index]);

if Bitmap nil then

begin

//copy bitmap to combobox coordinate

BrushCopy(Bounds(Rect.Left + 2, Rect.Top + 2, Bitmap.Width,

Bitmap.Height), Bitmap, Bounds(0, 0, Bitmap.Width,

Bitmap.Height), clred);

Offset := Bitmap.Width + 8;

end;

//Set a caption to each item

TextOut(Rect.Left + Offset, Rect.Top, Combobox1.Items[Index]);

end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);

begin

//free all bitmap objects

bitmap1.Free;

bitmap2.Free;

bitmap3.Free;

bitmap4.Free;

end;

//该代码片段来自于: http://www.sharejs.com/codes/delphi/8755

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