TImageList.draw is not drawing disabled images
lazarus / 31-LCL

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daniel_sap · 2025-03-27 11:40

Hi
I used to draw disabled images in Delphi with TImageList.draw
But now I try it in Lazarus LCL and it's not drawing the image
disabled.

I created also a speed button to test what will happen with the image
when it is disabled and also the speed button is not drawing it
disabled.
Do you have an idea what could be the issue

Lazarus 4.0RC1 (rev t-fixes-4-58-g43d904ed50) FPC 3.2.2
x86_64-win64-win32/win64

This is the code where I try the speed button
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i unit
Unit1; {$mode objfpc}{$H+} interface uses  Classes, SysUtils, Forms,
Controls, Graphics, Dialogs, Buttons, StdCtrls; type   { TForm1 }  
TForm1 = class(TForm)    CheckBox1: TCheckBox;    ImageList1:
TImageList;    SpeedButton1: TSpeedButton;    procedure
CheckBox1Change(Sender: TObject);  private   public   end; var  Form1:
TForm1; implementation {$R *.lfm} { TForm1 } procedure
TForm1.CheckBox1Change(Sender: TObject);begin  SpeedButton1.Enabled :=
CheckBox1.Checked;  Repaint;end; end.

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wp · 2025-03-27 12:16

I cannot confirm this - see attached mini-demo.

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daniel_sap · 2025-03-27 12:50

Quote from: wp on March 27, 2025, 01:16:59 pmI cannot confirm this -
see attached mini-demo.

I tried your project is working as expected on my side

The difference on my side is that images are 16x16

I created a mini demo also and attach it here.
Also attached the original image I test with

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wp · 2025-03-27 13:24

Your demo is working correctly. The problem is that your image is
almost black&white. Therefore, the conversion to grayscale is barely
visible. Find a different image (there is a large collection of free
icons in the folder images/general_purpose of the Lazarus
installation). Or modify it by some pixel editor to look more like you
think it should, add it to the image list and specify its index in the
DisabledImageIndex property.

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daniel_sap · 2025-03-28 06:51

Quote from: wp on March 27, 2025, 02:24:20 pmYour demo is working
correctly. The problem is that your image is almost black&white.
Therefore, the conversion to grayscale is barely visible. Find a
different image (there is a large collection of free icons in the
folder images/general_purpose of the Lazarus installation). Or modify
it by some pixel editor to look more like you think it should, add it
to the image list and specify its index in the DisabledImageIndex
property.

Thank you, wp
I changed few icons and works good.

However, will go in direction for custom mask for drawing the disabled
images.
For me black color as any other color can look disabled.