1 files changed, 73 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasAlternateSelection.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasAlternateSelection.java
new file mode 100644
index 000000000..c04061cbd
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasAlternateSelection.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2009 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 java.util.List;
+
+/**
+ * Information for the current alternate selection, i.e. the possible selected items
+ * that are located at the same x/y as the original view, either sibling or parents.
+ */
+/* package */ class CanvasAlternateSelection {
+    private final CanvasViewInfo mOriginatingView;
+    private final List<CanvasViewInfo> mAltViews;
+    private int mIndex;
+
+    /**
+     * Creates a new alternate selection based on the given originating view and the
+     * given list of alternate views. Both cannot be null.
+     */
+    public CanvasAlternateSelection(CanvasViewInfo originatingView, List<CanvasViewInfo> altViews) {
+        assert originatingView != null;
+        assert altViews != null;
+        mOriginatingView = originatingView;
+        mAltViews = altViews;
+        mIndex = altViews.size() - 1;
+    }
+
+    /** Returns the list of alternate views. Cannot be null. */
+    public List<CanvasViewInfo> getAltViews() {
+        return mAltViews;
+    }
+
+    /** Returns the originating view. Cannot be null. */
+    public CanvasViewInfo getOriginatingView() {
+        return mOriginatingView;
+    }
+
+    /**
+     * Returns the current alternate view to select.
+     * Initially this is the top-most view.
+     */
+    public CanvasViewInfo getCurrent() {
+        return mIndex >= 0 ? mAltViews.get(mIndex) : null;
+    }
+
+    /**
+     * Changes the current view to be the next one and then returns it.
+     * This loops through the alternate views.
+     */
+    public CanvasViewInfo getNext() {
+        if (mIndex == 0) {
+            mIndex = mAltViews.size() - 1;
+        } else if (mIndex > 0) {
+            mIndex--;
+        }
+
+        return getCurrent();
+    }
+}