1 files changed, 165 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvasViewer.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvasViewer.java
new file mode 100644
index 000000000..e349a1cb0
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvasViewer.java
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Eclipse Public License, Version 1.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.eclipse.org/org/documents/epl-v10.php
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ide.eclipse.adt.internal.editors.layout.gle2;
+
+import com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate;
+import com.android.ide.eclipse.adt.internal.editors.layout.gre.RulesEngine;
+
+import org.eclipse.core.runtime.ListenerList;
+import org.eclipse.jface.util.SafeRunnable;
+import org.eclipse.jface.viewers.IPostSelectionProvider;
+import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.jface.viewers.ISelectionChangedListener;
+import org.eclipse.jface.viewers.ISelectionProvider;
+import org.eclipse.jface.viewers.SelectionChangedEvent;
+import org.eclipse.jface.viewers.TreePath;
+import org.eclipse.jface.viewers.TreeSelection;
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+
+
+/**
+ * JFace {@link Viewer} wrapper around {@link LayoutCanvas}.
+ * <p/>
+ * The viewer is owned by {@link GraphicalEditorPart}.
+ * <p/>
+ * The viewer is an {@link ISelectionProvider} instance and is set as the
+ * site's main {@link ISelectionProvider} by the editor part. Consequently
+ * canvas' selection changes are broadcasted to anyone listening, which includes
+ * the part itself as well as the associated outline and property sheet pages.
+ */
+class LayoutCanvasViewer extends Viewer implements IPostSelectionProvider {
+
+    private LayoutCanvas mCanvas;
+    private final LayoutEditorDelegate mEditorDelegate;
+
+    public LayoutCanvasViewer(LayoutEditorDelegate editorDelegate,
+            RulesEngine rulesEngine,
+            Composite parent,
+            int style) {
+        mEditorDelegate = editorDelegate;
+        mCanvas = new LayoutCanvas(editorDelegate, rulesEngine, parent, style);
+
+        mCanvas.getSelectionManager().addSelectionChangedListener(mSelectionListener);
+    }
+
+    private ISelectionChangedListener mSelectionListener = new ISelectionChangedListener() {
+        @Override
+        public void selectionChanged(SelectionChangedEvent event) {
+            fireSelectionChanged(event);
+            firePostSelectionChanged(event);
+        }
+    };
+
+    @Override
+    public Control getControl() {
+        return mCanvas;
+    }
+
+    /**
+     * Returns the underlying {@link LayoutCanvas}.
+     * This is the same control as returned by {@link #getControl()} but clients
+     * have it already casted in the right type.
+     * <p/>
+     * This can never be null.
+     * @return The underlying {@link LayoutCanvas}.
+     */
+    public LayoutCanvas getCanvas() {
+        return mCanvas;
+    }
+
+    /**
+     * Returns the current layout editor's input.
+     */
+    @Override
+    public Object getInput() {
+        return mEditorDelegate.getEditor().getEditorInput();
+    }
+
+    /**
+     * Unused. We don't support switching the input.
+     */
+    @Override
+    public void setInput(Object input) {
+    }
+
+    /**
+     * Returns a new {@link TreeSelection} where each {@link TreePath} item
+     * is a {@link CanvasViewInfo}.
+     */
+    @Override
+    public ISelection getSelection() {
+        return mCanvas.getSelectionManager().getSelection();
+    }
+
+    /**
+     * Sets a new selection. <code>reveal</code> is ignored right now.
+     * <p/>
+     * The selection can be null, which is interpreted as an empty selection.
+     */
+    @Override
+    public void setSelection(ISelection selection, boolean reveal) {
+        if (mEditorDelegate.getEditor().getIgnoreXmlUpdate()) {
+            return;
+        }
+        mCanvas.getSelectionManager().setSelection(selection);
+    }
+
+    /** Unused. Refreshing is done solely by the owning {@link LayoutEditorDelegate}. */
+    @Override
+    public void refresh() {
+        // ignore
+    }
+
+    public void dispose() {
+        if (mSelectionListener != null) {
+            mCanvas.getSelectionManager().removeSelectionChangedListener(mSelectionListener);
+        }
+        if (mCanvas != null) {
+            mCanvas.dispose();
+            mCanvas = null;
+        }
+    }
+
+    // ---- Implements IPostSelectionProvider ----
+
+    private ListenerList mPostChangedListeners = new ListenerList();
+
+    @Override
+    public void addPostSelectionChangedListener(ISelectionChangedListener listener) {
+        mPostChangedListeners.add(listener);
+    }
+
+    @Override
+    public void removePostSelectionChangedListener(ISelectionChangedListener listener) {
+        mPostChangedListeners.remove(listener);
+    }
+
+    protected void firePostSelectionChanged(final SelectionChangedEvent event) {
+        Object[] listeners = mPostChangedListeners.getListeners();
+        for (int i = 0; i < listeners.length; i++) {
+            final ISelectionChangedListener l = (ISelectionChangedListener) listeners[i];
+            SafeRunnable.run(new SafeRunnable() {
+                @Override
+                public void run() {
+                    l.selectionChanged(event);
+                }
+            });
+        }
+    }
+}