1 files changed, 96 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/EmptyViewsOverlay.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/EmptyViewsOverlay.java
new file mode 100644
index 000000000..daa3e0eae
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/EmptyViewsOverlay.java
@@ -0,0 +1,96 @@
+/*
+ * 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 org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.Device;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Rectangle;
+
+/**
+ * The {@link EmptyViewsOverlay} paints bounding rectangles for any of the empty and
+ * invisible container views in the scene.
+ */
+public class EmptyViewsOverlay extends Overlay {
+    /** The {@link ViewHierarchy} containing visible view information. */
+    private final ViewHierarchy mViewHierarchy;
+
+    /** Border color to paint the bounding boxes with. */
+    private Color mBorderColor;
+
+    /** Vertical scaling & scrollbar information. */
+    private CanvasTransform mVScale;
+
+    /** Horizontal scaling & scrollbar information. */
+    private CanvasTransform mHScale;
+
+    /**
+     * Constructs a new {@link EmptyViewsOverlay} linked to the given view hierarchy.
+     *
+     * @param viewHierarchy The {@link ViewHierarchy} to render.
+     * @param hScale The {@link CanvasTransform} to use to transfer horizontal layout
+     *            coordinates to screen coordinates.
+     * @param vScale The {@link CanvasTransform} to use to transfer vertical layout coordinates
+     *            to screen coordinates.
+     */
+    public EmptyViewsOverlay(
+            ViewHierarchy viewHierarchy,
+            CanvasTransform hScale,
+            CanvasTransform vScale) {
+        super();
+        mViewHierarchy = viewHierarchy;
+        mHScale = hScale;
+        mVScale = vScale;
+    }
+
+    @Override
+    public void create(Device device) {
+        mBorderColor = new Color(device, SwtDrawingStyle.EMPTY.getStrokeColor());
+    }
+
+    @Override
+    public void dispose() {
+        if (mBorderColor != null) {
+            mBorderColor.dispose();
+            mBorderColor = null;
+        }
+    }
+
+    @Override
+    public void paint(GC gc) {
+        gc.setForeground(mBorderColor);
+        gc.setLineDash(null);
+        gc.setLineStyle(SwtDrawingStyle.EMPTY.getLineStyle());
+        int oldAlpha = gc.getAlpha();
+        gc.setAlpha(SwtDrawingStyle.EMPTY.getStrokeAlpha());
+        gc.setLineWidth(SwtDrawingStyle.EMPTY.getLineWidth());
+
+        for (CanvasViewInfo info : mViewHierarchy.getInvisibleViews()) {
+            Rectangle r = info.getAbsRect();
+
+            int x = mHScale.translate(r.x);
+            int y = mVScale.translate(r.y);
+            int w = mHScale.scale(r.width);
+            int h = mVScale.scale(r.height);
+
+            // +1: See explanation in equivalent code in {@link OutlineOverlay#paint}
+            gc.drawRectangle(x, y, w + 1, h + 1);
+        }
+
+        gc.setAlpha(oldAlpha);
+    }
+}