Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.scenegraph / src / org / simantics / scenegraph / g2d / events / EventHandlerStack.java

diff --git a/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventHandlerStack.java b/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventHandlerStack.java
new file mode 100644 (file)
index 0000000..f66023b
--- /dev/null
+++ b/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventHandlerStack.java
@@ -0,0 +1,89 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+/*\r
+ *\r
+ * @author Toni Kalajainen\r
+ */\r
+package org.simantics.scenegraph.g2d.events;\r
+\r
+import java.util.concurrent.atomic.AtomicBoolean;\r
+\r
+import org.simantics.utils.datastructures.prioritystack.PriorityStack;\r
+import org.simantics.utils.threads.CurrentThread;\r
+import org.simantics.utils.threads.IThreadWorkQueue;\r
+import org.simantics.utils.threads.ThreadUtils;\r
+\r
+/**\r
+ * @see IEventHandlerStack\r
+ * \r
+ * @author Toni Kalajainen\r
+ */\r
+public class EventHandlerStack extends PriorityStack<IEventHandler> implements IEventHandlerStack {\r
+\r
+    IThreadWorkQueue thread;\r
+\r
+    /**\r
+     * Creates a new event handler stack.\r
+     * \r
+     * Any event handled with this stack is handled in current thread.\r
+     */\r
+    public EventHandlerStack() {\r
+        super(IEventHandler.class);\r
+        this.thread = CurrentThread.getThreadAccess();\r
+    }\r
+\r
+    /**\r
+     * Creates a new event handler stack. Any event handled with this stack is\r
+     * handled in the given thread.\r
+     * \r
+     * @param eventHandlingThread\r
+     */\r
+    public EventHandlerStack(IThreadWorkQueue eventHandlingThread) {\r
+        super(IEventHandler.class);\r
+        this.thread = eventHandlingThread;\r
+    }\r
+\r
+    @Override\r
+    public int getEventMask() {\r
+        return EventTypes.AnyMask;\r
+    }\r
+\r
+    @Override\r
+    public boolean handleEvent(final Event e) {\r
+        final int eventType = EventTypes.toTypeMask(e);\r
+        if (thread.currentThreadAccess()) {\r
+            // Send event through interactor stack\r
+            IEventHandler list[] = toArray();\r
+            for (int i = list.length - 1; i >= 0; i--)\r
+                if (EventTypes.passes(list[i], eventType) && list[i].handleEvent(e))\r
+                    return true;\r
+            return false;\r
+        } else {\r
+            final AtomicBoolean result = new AtomicBoolean(false);\r
+            Runnable run = new Runnable() {\r
+                @Override\r
+                public void run() {\r
+                    // Send event through interactor stack\r
+                    IEventHandler list[] = toArray();\r
+                    for (int i = list.length - 1; i >= 0; i--)\r
+                        if (EventTypes.passes(list[i], eventType) && list[i].handleEvent(e)) {\r
+                            result.set(true);\r
+                            return;\r
+                        }\r
+                }\r
+            };\r
+            ThreadUtils.syncExec(thread, run);\r
+            return result.get();\r
+        }\r
+    }\r
+\r
+}\r