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/*
* Copyright (C) 2010 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 com.android.layoutlib.api;
import com.android.layoutlib.api.SceneResult.LayoutStatus;
import java.awt.image.BufferedImage;
import java.util.Map;
/**
* An object allowing interaction with an Android layout.
*
* This is returned by {@link LayoutBridge#createScene(SceneParams)}.
* and can then be used for subsequent actions on the layout.
*
* @since 5
*
*/
public class LayoutScene {
public interface IAnimationListener {
/**
* Called when a new animation frame is available for display.
*/
void onNewFrame(BufferedImage image);
/**
* Called when the animation is done playing.
*/
void done();
/**
* Returns true if the animation is canceled.
*/
void isCanceled();
}
/**
* Returns the last operation result.
*/
public SceneResult getResult() {
return new SceneResult(LayoutStatus.NOT_IMPLEMENTED);
}
/**
* Returns the {@link ViewInfo} object for the top level view.
* <p>
* This is reset to a new instance every time {@link #render()} is called and can be
* <code>null</code> if the call failed (and the method returned a {@link SceneResult} with
* {@link LayoutStatus#ERROR} or {@link LayoutStatus#NOT_IMPLEMENTED}.
* <p/>
* This can be safely modified by the caller.
*/
public ViewInfo getRootView() {
return null;
}
/**
* Returns the rendering of the full layout.
* <p>
* This is reset to a new instance every time {@link #render()} is called and can be
* <code>null</code> if the call failed (and the method returned a {@link SceneResult} with
* {@link LayoutStatus#ERROR} or {@link LayoutStatus#NOT_IMPLEMENTED}.
* <p/>
* This can be safely modified by the caller.
*/
public BufferedImage getImage() {
return null;
}
/**
* Returns a map of (XML attribute name, attribute value) containing only default attribute
* values, for the given view Object.
* @param viewObject the view object.
* @return a map of the default property values or null.
*/
public Map<String, String> getDefaultViewPropertyValues(Object viewObject) {
return null;
}
/**
* Re-renders the layout as-is.
* In case of success, this should be followed by calls to {@link #getRootView()} and
* {@link #getImage()} to access the result of the rendering.
*
* @return a {@link SceneResult} indicating the status of the action.
*/
public SceneResult render() {
return new SceneResult(LayoutStatus.NOT_IMPLEMENTED);
}
/**
* Sets the value of a given property on a given object.
* <p/>
* This does nothing more than change the property. To render the scene in its new state, a
* call to {@link #render()} is required.
* <p/>
* Any amount of actions can be taken on the scene before {@link #render()} is called.
*
* @param object
* @param propertyName
* @param propertyValue
*
* @return a {@link SceneResult} indicating the status of the action.
*/
public SceneResult setProperty(int object, String propertyName, String propertyValue) {
return new SceneResult(LayoutStatus.NOT_IMPLEMENTED);
}
/**
* Inserts a new child in a ViewGroup object.
* <p/>
* This does nothing more than change the layouy. To render the scene in its new state, a
* call to {@link #render()} is required.
* <p/>
* Any amount of actions can be taken on the scene before {@link #render()} is called.
*
* @return a {@link SceneResult} indicating the status of the action.
*/
public SceneResult insertChild() {
return new SceneResult(LayoutStatus.NOT_IMPLEMENTED);
}
/**
* Removes a child from a ViewGroup object.
* <p/>
* This does nothing more than change the layouy. To render the scene in its new state, a
* call to {@link #render()} is required.
* <p/>
* Any amount of actions can be taken on the scene before {@link #render()} is called.
*
* @return a {@link SceneResult} indicating the status of the action.
*/
public SceneResult removeChild() {
return new SceneResult(LayoutStatus.NOT_IMPLEMENTED);
}
/**
* Starts playing an given animation on a given object.
* <p/>
* The animation playback is asynchronous and the rendered frame is sent vi the
* <var>listener</var>.
*
* @return a {@link SceneResult} indicating the status of the action.
*/
public SceneResult animate(int object, int animation, IAnimationListener listener) {
return new SceneResult(LayoutStatus.NOT_IMPLEMENTED);
}
/**
* Discards the layout. No more actions can be called on this object.
*/
public void dispose() {
}
}
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