| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * 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 android.transition; |
| |
| import android.content.Context; |
| import android.graphics.Path; |
| import android.util.AttributeSet; |
| |
| /** |
| * This base class can be extended to provide motion along a Path to Transitions. |
| * |
| * <p> |
| * Transitions such as {@link android.transition.ChangeBounds} move Views, typically |
| * in a straight path between the start and end positions. Applications that desire to |
| * have these motions move in a curve can change how Views interpolate in two dimensions |
| * by extending PathMotion and implementing {@link #getPath(float, float, float, float)}. |
| * </p> |
| * <p>This may be used in XML as an element inside a transition.</p> |
| * <pre> |
| * {@code |
| * <changeBounds> |
| * <pathMotion class="my.app.transition.MyPathMotion"/> |
| * </changeBounds> |
| * } |
| * </pre> |
| */ |
| public abstract class PathMotion { |
| |
| public PathMotion() {} |
| |
| public PathMotion(Context context, AttributeSet attrs) {} |
| |
| /** |
| * Provide a Path to interpolate between two points <code>(startX, startY)</code> and |
| * <code>(endX, endY)</code>. This allows controlled curved motion along two dimensions. |
| * |
| * @param startX The x coordinate of the starting point. |
| * @param startY The y coordinate of the starting point. |
| * @param endX The x coordinate of the ending point. |
| * @param endY The y coordinate of the ending point. |
| * @return A Path along which the points should be interpolated. The returned Path |
| * must start at point <code>(startX, startY)</code>, typically using |
| * {@link android.graphics.Path#moveTo(float, float)} and end at <code>(endX, endY)</code>. |
| */ |
| public abstract Path getPath(float startX, float startY, float endX, float endY); |
| } |