On TabFolder, Foreground and Background colors are not getting applied inspite of setting.

[deepika-u]

On TabFolder, when trying to change Foreground and Background colors, they are not getting applied.

To Reproduce I am able to see the same problem via the below snippet, via ControlExample or via SWT Controls.

Snippet to reproduce the behavior

package org.eclipse.swt.snippets;

/*
 * TabFolder example snippet: create a tab folder (six pages)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet76 {

public static void main (String [] args) {
    Display display = new Display ();
    final Shell shell = new Shell (display);
    shell.setText("Snippet 76");
    final TabFolder tabFolder = new TabFolder (shell, SWT.BORDER);
    Rectangle clientArea = shell.getClientArea ();
    tabFolder.setLocation (clientArea.x, clientArea.y);
    tabFolder.setBackground(display.getSystemColor(SWT.COLOR_YELLOW));
    tabFolder.setForeground(display.getSystemColor(SWT.COLOR_RED));
    for (int i=0; i<6; i++) {
        TabItem item = new TabItem (tabFolder, SWT.NONE);
        item.setText ("TabItem " + i);
        Button button = new Button (tabFolder, SWT.PUSH);
        button.setText ("Page " + i);
        item.setControl (button);
    }
    //tabFolder.setSelection(4);
    tabFolder.pack ();
    shell.pack ();
    shell.open ();
    while (!shell.isDisposed ()) {
        if (!display.readAndDispatch ()) display.sleep ();
    }
    display.dispose ();
}
}

Expected behavior Like how CTabFolder, color changes should be applied even on TabFolder.

Environment:

1. Select the platform(s) on which the behavior is seen:
   • • [ ] All OS
   • • [X] Windows
   • • [ ] Linux
   • • [ ] macOS

Seeing the problem on below environment: Eclipse SDK Version: 2024-09 (4.33) Build id: I20240805-1800 OS: Windows 11, v.10.0, x86_64 / win32 Java vendor: Eclipse Adoptium Java runtime version: 21.0.1+12-LTS Java version: 21.0.1

[elsazac]

Setting foreground and background colour on Tabfolder works fine on MacOS.

This is how it is in Mac :

[elsazac]

Could someone verify the behavior on Linux?

[iloveeclipse]

Here how TabFolder looks like on RHEL 9.2:

Here CTabFolder used in your snippet:

Obviously they differ, but the one is created by native widget toolkit, other one is "faked".

I believe this could be difficult to get consistent behavior on all platforms without breaking existing code. But if you want consistency, please provide patches...

[deepika-u]

When checked further on windows apis, i am not able to find anything specifically to set foreground or background on tabfolder on windows from below api list like tabctrl_set.... => https://learn.microsoft.com/en-us/windows/win32/api/commctrl/nf-commctrl-tabctrl_setcurfocus

So as of now this issue can be closed as an windows limitation. Can someone add labels as limitation, windows and close this issue please.