First of all, I already know that when you are implementing a TSpeedButton, when you assign its Glyph, if you do not have more than one glyph, then NumGlyphs should be 1, and when it's disabled, it will automatically use the same image to auto-generate a disabled version of the glyph.
However, in my situation, I am assigning an action to this speed button. The TActionManager has both the Images and DisabledImages pointed to the very same TImageList. I've also tested without any DisabledImages assigned at all, as well as creating a copy of the images using an all-black mask, and assigning that via the DisabledImages.
The glyph shows just fine (based on the image set up on the action) when it's enabled. But when it's disabled, only pure black colors in the images will be used for disabled images. Anything which has any sort of color besides pure black, even slightly off-black, is completely ignored, and not included when rendering the disabled image.
Here's a comparison between a test enabled image and the auto-generated disabled image. The image is just a 16x16 bitmap with some vertical lines. Starting from the far right, a completely black line, followed by slightly lighter lines to the left of it.
As you can see, when disabled, it only considers the completely black line. The next line over is only very slightly lighter than complete black.
I cannot assign the Glyph property myself, because it will be overwritten by the action which is assigned to it. I also cannot set up the two-glyph-wide images on the image list either, because these images are widely used in many other places which have no concept of multiple glyphs. I also do not want to use all-black for my images.
How do I get a disabled TSpeedButton (as result of disabled TAction) to show a disabled (grayed out) image when it has an action assigned to it?
NOTE: The same happens with the TBitBtn, or otherwise any control which relies on a Glyph.
u44169002.pas
unit u44169002;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.Buttons, System.ImageList,
Vcl.ImgList, System.Actions, Vcl.ActnList, Vcl.PlatformDefaultStyleActnCtrls, Vcl.ActnMan, Vcl.StdCtrls;
type
TForm1 = class(TForm)
Actions: TActionManager;
actTest: TAction;
ImageList: TImageList;
SpeedButton1: TSpeedButton;
BitBtn1: TBitBtn;
procedure actTestExecute(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.actTestExecute(Sender: TObject);
begin
Self.actTest.Enabled:= False;
end;
end.
u44169002.dfm
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 231
ClientWidth = 405
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object SpeedButton1: TSpeedButton
Left = 24
Top = 24
Width = 105
Height = 33
Action = actTest
Flat = True
end
object BitBtn1: TBitBtn
Left = 160
Top = 24
Width = 105
Height = 33
Action = actTest
Caption = 'Test Action'
TabOrder = 0
end
object Actions: TActionManager
DisabledImages = ImageList
Images = ImageList
Left = 24
Top = 128
StyleName = 'Platform Default'
object actTest: TAction
Caption = 'Test Action'
Hint = 'This is just a test action'
ImageIndex = 0
OnExecute = actTestExecute
end
end
object ImageList: TImageList
Left = 24
Top = 72
Bitmap = {
494C010101000800440010001000FFFFFFFFFF10FFFFFFFFFFFFFFFF424D3600
0000000000003600000028000000400000001000000001002000000000000010
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000000000000}
end
end
For the sake of example, here's the test bitmap I used:
In fact, in the Vcl.Buttons unit, in the function TButtonGlyph.CreateButtonGlyph, the following code seems to explicitly consider only the black areas:
{ Create a disabled version }
with MonoBmp do
begin
Assign(FOriginal);
HandleType := bmDDB;
Canvas.Brush.Color := clBlack;
Width := IWidth;
if Monochrome then
begin
Canvas.Font.Color := clWhite;
Monochrome := False;
Canvas.Brush.Color := clWhite;
end;
Monochrome := True;
end;
with TmpImage.Canvas do
begin
Brush.Color := clBtnFace;
FillRect(IRect);
Brush.Color := clBtnHighlight;
SetTextColor(Handle, clBlack);
SetBkColor(Handle, clWhite);
BitBlt(Handle, 1, 1, IWidth, IHeight,
MonoBmp.Canvas.Handle, 0, 0, ROP_DSPDxax);
Brush.Color := clBtnShadow;
SetTextColor(Handle, clBlack);
SetBkColor(Handle, clWhite);
BitBlt(Handle, 0, 0, IWidth, IHeight,
MonoBmp.Canvas.Handle, 0, 0, ROP_DSPDxax);
end;
Put the speedbutton on a groupbox and disable the group box you do not need disabled glyphs and still only 1 image the image will be there but the button still clearly dis-abeled