1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Eclipse Public License, Version 1.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.eclipse.org/org/documents/epl-v10.php 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ide.eclipse.adt.internal.editors.layout.gle2; 18 19 import java.util.List; 20 21 /** 22 * Information for the current alternate selection, i.e. the possible selected items 23 * that are located at the same x/y as the original view, either sibling or parents. 24 */ 25 /* package */ class CanvasAlternateSelection { 26 private final CanvasViewInfo mOriginatingView; 27 private final List<CanvasViewInfo> mAltViews; 28 private int mIndex; 29 30 /** 31 * Creates a new alternate selection based on the given originating view and the 32 * given list of alternate views. Both cannot be null. 33 */ CanvasAlternateSelection(CanvasViewInfo originatingView, List<CanvasViewInfo> altViews)34 public CanvasAlternateSelection(CanvasViewInfo originatingView, List<CanvasViewInfo> altViews) { 35 assert originatingView != null; 36 assert altViews != null; 37 mOriginatingView = originatingView; 38 mAltViews = altViews; 39 mIndex = altViews.size() - 1; 40 } 41 42 /** Returns the list of alternate views. Cannot be null. */ getAltViews()43 public List<CanvasViewInfo> getAltViews() { 44 return mAltViews; 45 } 46 47 /** Returns the originating view. Cannot be null. */ getOriginatingView()48 public CanvasViewInfo getOriginatingView() { 49 return mOriginatingView; 50 } 51 52 /** 53 * Returns the current alternate view to select. 54 * Initially this is the top-most view. 55 */ getCurrent()56 public CanvasViewInfo getCurrent() { 57 return mIndex >= 0 ? mAltViews.get(mIndex) : null; 58 } 59 60 /** 61 * Changes the current view to be the next one and then returns it. 62 * This loops through the alternate views. 63 */ getNext()64 public CanvasViewInfo getNext() { 65 if (mIndex == 0) { 66 mIndex = mAltViews.size() - 1; 67 } else if (mIndex > 0) { 68 mIndex--; 69 } 70 71 return getCurrent(); 72 } 73 } 74