| /* |
| * 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(); |
| } |
| } |