[GTK4] Stop handling expose events directly

ptziegler · akurtakov · commit df1c412f73b1 · 2025-02-11T09:29:41.000+02:00
The handling of expose events has been internalized with GTK4 making it impossible to e.g. invalidate an area of a surface. Furthermore, the native method that are called no longer exist in GTK4, leading to an UnsatisfiedLinkError. From the documentation: Application and widget code should not handle expose events directly; invalidation should use the GtkWidget API, and drawing should only happen inside GtkWidget::draw implementations. Closes #1794
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java
@@ -1015,6 +1015,9 @@ static void checkDisplay (Thread thread, boolean multiple) {
 }
 
 long checkIfEventProc (long display, long xEvent, long userData) {
+	if (GTK.GTK4) {
+		return 0;
+	}
 	int type = OS.X_EVENT_TYPE (xEvent);
 	switch (type) {
 		case OS.Expose:

Original file line number	Diff line number	Diff line change
`@@ -1015,6 +1015,9 @@ static void checkDisplay (Thread thread, boolean multiple) {`
`1015`	`1015`	`}`
`1016`	`1016`
`1017`	`1017`	`long checkIfEventProc (long display, long xEvent, long userData) {`
	`1018`	`+ if (GTK.GTK4) {`
	`1019`	`+ return 0;`
	`1020`	`+ }`
`1018`	`1021`	`int type = OS.X_EVENT_TYPE (xEvent);`
`1019`	`1022`	`switch (type) {`
`1020`	`1023`	`case OS.Expose:`