--- /dev/null
+/*******************************************************************************\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
+package org.simantics.g2d.canvas.impl;\r
+\r
+import java.awt.Cursor;\r
+import java.lang.reflect.Method;\r
+import java.util.HashMap;\r
+import java.util.Map;\r
+import java.util.Stack;\r
+\r
+import org.simantics.g2d.canvas.IMouseCursorContext;\r
+import org.simantics.g2d.canvas.IMouseCursorHandle;\r
+import org.simantics.g2d.canvas.IMouseCursorHandleListener;\r
+import org.simantics.g2d.canvas.IMouseCursorListener;\r
+import org.simantics.utils.datastructures.ListenerList;\r
+import org.simantics.utils.threads.IThreadWorkQueue;\r
+import org.simantics.utils.threads.SyncListenerList;\r
+\r
+/**\r
+ * @author Toni Kalajainen\r
+ */\r
+public class MouseCursorContext implements IMouseCursorContext {\r
+\r
+ protected Map<Integer, Stack<CursorReserve>> mouseCursorStack =\r
+ new HashMap<Integer, Stack<CursorReserve>>();\r
+\r
+ protected SyncListenerList<IMouseCursorListener> cursorListeners =\r
+ new SyncListenerList<IMouseCursorListener>(IMouseCursorListener.class);\r
+ \r
+\r
+ public void addCursorListener(IMouseCursorListener listener) {\r
+ cursorListeners.add(listener);\r
+ }\r
+ public void addCursorListener(IMouseCursorListener listener, IThreadWorkQueue thread) {\r
+ cursorListeners.add(thread, listener);\r
+ } \r
+ public void removeCursorListener(IMouseCursorListener listener) {\r
+ cursorListeners.remove(listener);\r
+ }\r
+ public void removeCursorListener(IMouseCursorListener listener, IThreadWorkQueue thread) {\r
+ cursorListeners.remove(thread, listener);\r
+ }\r
+ \r
+ private final static Method onCursorSet = SyncListenerList.getMethod(IMouseCursorListener.class, "onCursorSet");\r
+ protected void fireSetCursor(int mouseId, Cursor cursor) {\r
+ cursorListeners.fireEventSync(onCursorSet, this, mouseId, cursor);\r
+ }\r
+ protected void fireAsyncSetCursor(int mouseId, Cursor cursor) {\r
+ cursorListeners.fireEventAsync(onCursorSet, this, mouseId, cursor);\r
+ }\r
+ \r
+ \r
+ class CursorReserve implements IMouseCursorHandle\r
+ {\r
+ Cursor cursor;\r
+ int mouseId;\r
+ ListenerList<IMouseCursorHandleListener> listeners; \r
+ public CursorReserve(Cursor cursor, int mouseId)\r
+ {\r
+ this.cursor = cursor;\r
+ this.mouseId = mouseId;\r
+ }\r
+ @Override \r
+ public void remove() {\r
+ synchronized(MouseCursorContext.this)\r
+ {\r
+ Stack<CursorReserve> cursorStack = mouseCursorStack.get(mouseId);\r
+ if (cursorStack == null || !cursorStack.contains(this))\r
+ return;\r
+ \r
+ boolean wasLast = cursorStack.lastElement()==this;\r
+ cursorStack.remove(this);\r
+ if (cursorStack.isEmpty()) {\r
+ _setCursor(mouseId, null);\r
+ return;\r
+ }\r
+ // Select the second last cursor\r
+ if (wasLast) {\r
+ CursorReserve newLast = cursorStack.peek();\r
+ if (newLast==null) {\r
+ _setCursor(mouseId, null);\r
+ } else {\r
+ Cursor newCursor = newLast.cursor;\r
+ if (!cursor.equals(newCursor))\r
+ _setCursor(mouseId, newCursor); \r
+ }\r
+ }\r
+ }\r
+ }\r
+ @Override\r
+ public Cursor getCursor() {\r
+ return cursor;\r
+ }\r
+ @Override\r
+ public int getMouseId() {\r
+ return mouseId;\r
+ }\r
+ void fireOnRemoved() {\r
+ ListenerList<IMouseCursorHandleListener> lis;\r
+ synchronized(this) {\r
+ lis = listeners;\r
+ if (lis==null) return;\r
+ }\r
+ \r
+ for (IMouseCursorHandleListener l : lis.getListeners())\r
+ l.onMouseCursorRemoved(this);\r
+ }\r
+ \r
+ @Override\r
+ public synchronized void addMouseCursorHandleListener(IMouseCursorHandleListener listener) {\r
+ if (listeners == null) {\r
+ listeners = new ListenerList<IMouseCursorHandleListener>(IMouseCursorHandleListener.class);\r
+ }\r
+ listeners.add(listener);\r
+ }\r
+ @Override\r
+ public synchronized void removeMouseCursorHandleListener(IMouseCursorHandleListener listener) {\r
+ if (listeners == null) return;\r
+ listeners.remove(listener);\r
+ } \r
+ }\r
+ \r
+ @Override\r
+ public synchronized IMouseCursorHandle setCursor(int mouseId, Cursor cursor) {\r
+ assert(cursor!=null);\r
+ Stack<CursorReserve> cursorStack = mouseCursorStack.get(mouseId);\r
+ if (cursorStack == null) {\r
+ cursorStack = new Stack<CursorReserve>();\r
+ mouseCursorStack.put(mouseId, cursorStack);\r
+ }\r
+ CursorReserve cr = new CursorReserve(cursor, mouseId);\r
+ cursorStack.push(cr);\r
+ _setCursor(mouseId, cursor);\r
+ return cr;\r
+ }\r
+ \r
+ protected void _setCursor(int mouseId, Cursor cursor)\r
+ {\r
+ fireAsyncSetCursor(mouseId, cursor); \r
+ }\r
+ \r
+ \r
+}\r