Bug 543984 - [GTK4] Adapt to GdkEventType constants changes

Add new GdkEventType constant values, adapt GDK.EXPOSE,
GDK.BUTTON_PRESS, GDK.BUTTON_RELEASE on GTK4.

Guard connecting to event signal in Shell to avoid duplicate mouse
press/release events.

Tested on GTK3 with ControlExample MouseListener. Tested with attached
snippet on GTK4.

Change-Id: Ida2f3a4d77efcb98d99a1aa4bcbb418c8cbfc718

1 files changed, 66 insertions, 0 deletions

diff --git a/tests/org.eclipse.swt.tests.gtk/ManualTests/org/eclipse/swt/tests/gtk/snippets/Bug543984_GTK4EventTypeConstants.java b/tests/org.eclipse.swt.tests.gtk/ManualTests/org/eclipse/swt/tests/gtk/snippets/Bug543984_GTK4EventTypeConstants.java
new file mode 100644
index 0000000000..75724e3e21
--- /dev/null
+++ b/tests/org.eclipse.swt.tests.gtk/ManualTests/org/eclipse/swt/tests/gtk/snippets/Bug543984_GTK4EventTypeConstants.java
@@ -0,0 +1,66 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Red Hat and others. All rights reserved.
+ * The contents of this file are made available under the terms
+ * of the GNU Lesser General Public License (LGPL) Version 2.1 that
+ * accompanies this distribution (lgpl-v21.txt).  The LGPL is also
+ * available at http://www.gnu.org/licenses/lgpl.html.  If the version
+ * of the LGPL at http://www.gnu.org is different to the version of
+ * the LGPL accompanying this distribution and there is any conflict
+ * between the two license versions, the terms of the LGPL accompanying
+ * this distribution shall govern.
+ *
+ * Contributors:
+ *     Red Hat - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.tests.gtk.snippets;
+
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.events.MouseListener;
+import org.eclipse.swt.layout.FillLayout;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Shell;
+
+/*
+ * Title:
+ * How to run:
+ * Bug description:
+ * Expected results:
+ * GTK Version(s):
+ */
+public class Bug543984_GTK4EventTypeConstants {
+
+	public static void main(String[] args) {
+		Display display = new Display();
+		Shell shell = new Shell(display);
+		shell.setLayout(new FillLayout());
+		shell.setSize(500, 200);
+
+		shell.open();
+
+		shell.addMouseListener(new MouseListener() {
+
+			@Override
+			public void mouseUp(MouseEvent e) {
+				System.out.println("MouseUp");
+
+			}
+
+			@Override
+			public void mouseDown(MouseEvent e) {
+				System.out.println("MouseDown");
+
+			}
+
+			@Override
+			public void mouseDoubleClick(MouseEvent e) {
+				// TODO: GDK_2BUTTON_PRESS removed in GTK4, no signal for double click
+				System.out.println("MouseDoubleClick");
+
+			}
+		});
+		while (!shell.isDisposed()) {
+			if (!display.readAndDispatch())
+				display.sleep();
+		}
+	}
+}