Use new SWT Display.setDarkThemePreferred() API for dark theme

vogella · vogella · commit 6a5f7a82df72 · 2026-04-10T18:08:21.000+02:00
Replace platform-specific dark theme processors (Win32, GTK, Cocoa) with the new cross-platform SWT API Display.setDarkThemePreferred(boolean). The ThemeEngine now calls display.setDarkThemePreferred() directly when a theme is set, signaling the dark mode preference to the OS for native components like title bars, scrollbars, and native dialogs. In IDEApplication, the manual dark styling (hardcoded colors, SWT.Show listeners, recursive style application) is replaced with a single call to display.setDarkThemePreferred(true) during early startup. Dark theme processor code removed from: - org.eclipse.e4.ui.swt.win32 (DarkThemeProcessor using OS.setTheme) - org.eclipse.e4.ui.swt.gtk (DarkThemeProcessor using OS.setDarkThemePreferred) - org.eclipse.e4.ui.workbench.renderers.swt.cocoa (CocoaDarkThemeProcessor using OS.setTheme) The bundles themselves are kept for later retirement. Fixes #3857
diff --git a/bundles/org.eclipse.e4.ui.css.swt.theme/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.css.swt.theme/META-INF/MANIFEST.MF
@@ -6,7 +6,7 @@ Bundle-Name: %pluginName
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: JavaSE-21
-Require-Bundle: org.eclipse.swt;bundle-version="[3.133.0,4.0.0)",
+Require-Bundle: org.eclipse.swt;bundle-version="[3.134.0,4.0.0)",
  org.eclipse.e4.ui.css.swt;bundle-version="0.13.100",
  org.eclipse.e4.ui.css.core;bundle-version="0.12.200",
  org.eclipse.core.runtime;bundle-version="[3.29.0,4.0.0)"
diff --git a/bundles/org.eclipse.e4.ui.css.swt.theme/src/org/eclipse/e4/ui/css/swt/internal/theme/ThemeEngine.java b/bundles/org.eclipse.e4.ui.css.swt.theme/src/org/eclipse/e4/ui/css/swt/internal/theme/ThemeEngine.java
@@ -510,6 +510,9 @@ public void setTheme(ITheme theme, boolean restore, boolean force) {
 				ThemeEngineManager.logError(e.getMessage(), e);
 			}
 		}
+		boolean isDark = theme.getId().contains("dark"); //$NON-NLS-1$
+		display.setDarkThemePreferred(isDark);
+
 		sendThemeChangeEvent(restore);
 
 		for (CSSEngine engine : cssEngines) {
diff --git a/bundles/org.eclipse.e4.ui.swt.gtk/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.swt.gtk/META-INF/MANIFEST.MF
@@ -8,8 +8,4 @@ Bundle-RequiredExecutionEnvironment: JavaSE-17
 Bundle-Localization: fragment-gtk
 Bundle-Vendor: %providerName
 Eclipse-PlatformFilter: (osgi.ws=gtk)
-Import-Package: jakarta.annotation;version="[2.1.0,3.0.0)",
- jakarta.inject;version="[2.0.0,3.0.0)",
- org.eclipse.e4.core.services.events,
- org.osgi.service.event;version="1.3.1"
 Automatic-Module-Name: org.eclipse.e4.ui.swt.gtk
diff --git a/bundles/org.eclipse.e4.ui.swt.gtk/fragment.xml b/bundles/org.eclipse.e4.ui.swt.gtk/fragment.xml
@@ -1,13 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.4"?>
 <fragment>
-   <extension id="org.eclipse.e4.ui.swt.gtk.processor"
-         point="org.eclipse.e4.workbench.model">
-      <processor
-            apply="always"
-            beforefragment="true"
-            class="org.eclipse.e4.ui.swt.internal.gtk.DarkThemeProcessor">
-      </processor>
-   </extension>
 
 </fragment>
diff --git a/bundles/org.eclipse.e4.ui.swt.gtk/src/org/eclipse/e4/ui/swt/internal/gtk/DarkThemeProcessor.java b/bundles/org.eclipse.e4.ui.swt.gtk/src/org/eclipse/e4/ui/swt/internal/gtk/DarkThemeProcessor.java
diff --git a/bundles/org.eclipse.e4.ui.swt.win32/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.swt.win32/META-INF/MANIFEST.MF
@@ -8,8 +8,4 @@ Bundle-RequiredExecutionEnvironment: JavaSE-17
 Bundle-Localization: fragment-win32
 Bundle-Vendor: %providerName
 Eclipse-PlatformFilter: (osgi.ws=win32)
-Import-Package: jakarta.annotation;version="[2.1.0,3.0.0)",
- jakarta.inject;version="[2.0.0,3.0.0)",
- org.eclipse.e4.core.services.events,
- org.osgi.service.event;version="[1.3.0,2.0.0)"
 Automatic-Module-Name: org.eclipse.e4.ui.swt.win32
diff --git a/bundles/org.eclipse.e4.ui.swt.win32/fragment.xml b/bundles/org.eclipse.e4.ui.swt.win32/fragment.xml
@@ -1,13 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.4"?>
 <fragment>
-   <extension id="org.eclipse.e4.ui.swt.win32.processor"
-         point="org.eclipse.e4.workbench.model">
-      <processor
-            apply="always"
-            beforefragment="true"
-            class="org.eclipse.e4.ui.swt.internal.win32.DarkThemeProcessor">
-      </processor>
-   </extension>
 
 </fragment>
diff --git a/bundles/org.eclipse.e4.ui.swt.win32/src/org/eclipse/e4/ui/swt/internal/win32/DarkThemeProcessor.java b/bundles/org.eclipse.e4.ui.swt.win32/src/org/eclipse/e4/ui/swt/internal/win32/DarkThemeProcessor.java
diff --git a/bundles/org.eclipse.e4.ui.workbench.renderers.swt.cocoa/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.workbench.renderers.swt.cocoa/META-INF/MANIFEST.MF
@@ -6,7 +6,6 @@ Bundle-Version: 0.14.600.qualifier
 Bundle-Name: %fragmentName
 Bundle-Vendor: %providerName
 Fragment-Host: org.eclipse.e4.ui.workbench.renderers.swt;bundle-version="[0.10.0,1.0.0)"
-Require-Bundle: org.eclipse.e4.ui.css.swt.theme
 Bundle-Localization: fragment-cocoa
 Bundle-RequiredExecutionEnvironment: JavaSE-17
 Export-Package: org.eclipse.e4.ui.workbench.renderers.swt.cocoa;x-internal:=true
diff --git a/bundles/org.eclipse.e4.ui.workbench.renderers.swt.cocoa/fragment.xml b/bundles/org.eclipse.e4.ui.workbench.renderers.swt.cocoa/fragment.xml
@@ -11,15 +11,5 @@
             class="org.eclipse.e4.ui.workbench.renderers.swt.cocoa.CocoaUIProcessor">
       </processor>
    </extension>
-   <extension
-         id="CocoaDarkThemeProcessor"
-         name="Cocoa Dark Theme Processor"
-         point="org.eclipse.e4.workbench.model">
-      <processor
-      		apply="always"
-            beforefragment="false"
-            class="org.eclipse.e4.ui.swt.internal.cocoa.CocoaDarkThemeProcessor">
-      </processor>
-   </extension>
    
 </fragment>
diff --git a/bundles/org.eclipse.e4.ui.workbench.renderers.swt.cocoa/src/org/eclipse/e4/ui/swt/internal/cocoa/CocoaDarkThemeProcessor.java b/bundles/org.eclipse.e4.ui.workbench.renderers.swt.cocoa/src/org/eclipse/e4/ui/swt/internal/cocoa/CocoaDarkThemeProcessor.java
diff --git a/bundles/org.eclipse.ui.ide.application/src/org/eclipse/ui/internal/ide/application/IDEApplication.java b/bundles/org.eclipse.ui.ide.application/src/org/eclipse/ui/internal/ide/application/IDEApplication.java
@@ -42,6 +42,7 @@
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.core.runtime.preferences.ConfigurationScope;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences;
 import org.eclipse.equinox.app.IApplication;
 import org.eclipse.equinox.app.IApplicationContext;
 import org.eclipse.jface.dialogs.IDialogConstants;
@@ -94,6 +95,7 @@ public class IDEApplication implements IApplication, IExecutableExtension {
 
 	private static final String USER_NAME = "user.name"; //$NON-NLS-1$
 
+
 	// Use the branding plug-in of the platform feature since this is most likely
 	// to change on an update of the IDE.
 	private static final String WORKSPACE_CHECK_REFERENCE_BUNDLE_NAME = "org.eclipse.platform"; //$NON-NLS-1$
@@ -145,6 +147,9 @@ public Object start(IApplicationContext appContext) throws Exception {
 		Job.getJobManager().suspend();
 
 		Display display = createDisplay();
+
+		initializeDefaultTheme(display);
+
 		// processor must be created before we start event loop
 		DelayedEventsProcessor processor = new DelayedEventsProcessor(display);
 
@@ -586,7 +591,6 @@ protected Shell getParentShell() {
 				// in the task manager of the OS
 				return null;
 			}
-
 		}.prompt(force);
 	}
 
@@ -852,6 +856,16 @@ protected static Version toMajorMinorVersion(Version version) {
 		return new Version(version.getMajor(), version.getMinor(), 0);
 	}
 
+	protected void initializeDefaultTheme(Display display) {
+		IEclipsePreferences configurationScopeNode = ConfigurationScope.INSTANCE
+				.getNode("org.eclipse.e4.ui.css.swt.theme"); //$NON-NLS-1$
+		String defaultThemeId = configurationScopeNode.get("themeid", null); //$NON-NLS-1$
+		boolean isDark = defaultThemeId != null && defaultThemeId.contains("dark"); //$NON-NLS-1$
+		if (isDark) {
+			display.setDarkThemePreferred(true);
+		}
+	}
+
 	@Override
 	public void stop() {
 		final IWorkbench workbench = PlatformUI.getWorkbench();
@@ -865,4 +879,4 @@ public void stop() {
 			}
 		});
 	}
-}
+}

Original file line number	Diff line number	Diff line change
`@@ -510,6 +510,9 @@ public void setTheme(ITheme theme, boolean restore, boolean force) {`
`510`	`510`	`ThemeEngineManager.logError(e.getMessage(), e);`
`511`	`511`	`}`
`512`	`512`	`}`
	`513`	`+ boolean isDark = theme.getId().contains("dark"); //$NON-NLS-1$`
	`514`	`+ display.setDarkThemePreferred(isDark);`
	`515`	`+`
`513`	`516`	`sendThemeChangeEvent(restore);`
`514`	`517`
`515`	`518`	`for (CSSEngine engine : cssEngines) {`