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/*
* 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();
}
}
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