Mega Code Archive
How to show multiline Text in a TCombobox (alternativ)
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Title: How to show multiline Text in a TCombobox (alternativ)
procedure TForm1.ComboBox1MeasureItem(Control: TWinControl; Index: Integer;
var Height: Integer);
var
ItemString: string;
MyRect: TRect;
MyImage: TImage;
MyCombo: TComboBox;
begin
// Don't waste time with this on Index = -1
if (Index -1) then
begin
MyCombo := TComboBox(Control);
// Create a temporary canvas to calculate the height
MyImage := TImage.Create(MyCombo);
try
MyRect := MyCombo.ClientRect;
ItemString := MyCombo.Items.Strings[Index];
MyImage.Canvas.Font := MyCombo.Font;
// Calc. using this ComboBox's font size
Height := DrawText(MyImage.Canvas.Handle, PChar(ItemString),
- 1, MyRect, DT_CALCRECT or DT_WORDBREAK);
finally
MyImage.Free;
end;
end;
end;
procedure TForm1.ComboBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
var
ItemString: string;
begin
TComboBox(Control).Canvas.FillRect(Rect);
ItemString := TComboBox(Control).Items.Strings[Index];
DrawText(TComboBox(Control).Canvas.Handle, PChar(ItemString), - 1, Rect, DT_WORDBREAK);
end;
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