| /* |
| * Copyright (C) 2013 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.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.content.res.XmlResourceParser; |
| import android.util.AttributeSet; |
| import android.util.Xml; |
| import android.view.InflateException; |
| import android.view.ViewGroup; |
| import android.view.animation.AnimationUtils; |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| /** |
| * This class inflates scenes and transitions from resource files. |
| * |
| * Information on XML resource descriptions for transitions can be found for |
| * {@link android.R.styleable#Transition}, {@link android.R.styleable#TransitionSet}, |
| * {@link android.R.styleable#TransitionTarget}, {@link android.R.styleable#Fade}, |
| * and {@link android.R.styleable#TransitionManager}. |
| */ |
| public class TransitionInflater { |
| |
| private Context mContext; |
| |
| private TransitionInflater(Context context) { |
| mContext = context; |
| } |
| |
| /** |
| * Obtains the TransitionInflater from the given context. |
| */ |
| public static TransitionInflater from(Context context) { |
| return new TransitionInflater(context); |
| } |
| |
| /** |
| * Loads a {@link Transition} object from a resource |
| * |
| * @param resource The resource id of the transition to load |
| * @return The loaded Transition object |
| * @throws android.content.res.Resources.NotFoundException when the |
| * transition cannot be loaded |
| */ |
| public Transition inflateTransition(int resource) { |
| XmlResourceParser parser = mContext.getResources().getXml(resource); |
| try { |
| return createTransitionFromXml(parser, Xml.asAttributeSet(parser), null); |
| } catch (XmlPullParserException e) { |
| InflateException ex = new InflateException(e.getMessage()); |
| ex.initCause(e); |
| throw ex; |
| } catch (IOException e) { |
| InflateException ex = new InflateException( |
| parser.getPositionDescription() |
| + ": " + e.getMessage()); |
| ex.initCause(e); |
| throw ex; |
| } finally { |
| parser.close(); |
| } |
| } |
| |
| /** |
| * Loads a {@link TransitionManager} object from a resource |
| * |
| * |
| * |
| * @param resource The resource id of the transition manager to load |
| * @return The loaded TransitionManager object |
| * @throws android.content.res.Resources.NotFoundException when the |
| * transition manager cannot be loaded |
| */ |
| public TransitionManager inflateTransitionManager(int resource, ViewGroup sceneRoot) { |
| XmlResourceParser parser = mContext.getResources().getXml(resource); |
| try { |
| return createTransitionManagerFromXml(parser, Xml.asAttributeSet(parser), sceneRoot); |
| } catch (XmlPullParserException e) { |
| InflateException ex = new InflateException(e.getMessage()); |
| ex.initCause(e); |
| throw ex; |
| } catch (IOException e) { |
| InflateException ex = new InflateException( |
| parser.getPositionDescription() |
| + ": " + e.getMessage()); |
| ex.initCause(e); |
| throw ex; |
| } finally { |
| parser.close(); |
| } |
| } |
| |
| // |
| // Transition loading |
| // |
| |
| private Transition createTransitionFromXml(XmlPullParser parser, |
| AttributeSet attrs, TransitionSet transitionSet) |
| throws XmlPullParserException, IOException { |
| |
| Transition transition = null; |
| |
| // Make sure we are on a start tag. |
| int type; |
| int depth = parser.getDepth(); |
| |
| while (((type=parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) |
| && type != XmlPullParser.END_DOCUMENT) { |
| |
| boolean newTransition = false; |
| |
| if (type != XmlPullParser.START_TAG) { |
| continue; |
| } |
| |
| String name = parser.getName(); |
| if ("fade".equals(name)) { |
| TypedArray a = mContext.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.Fade); |
| int fadingMode = a.getInt(com.android.internal.R.styleable.Fade_fadingMode, |
| Fade.IN | Fade.OUT); |
| transition = new Fade(fadingMode); |
| newTransition = true; |
| } else if ("changeBounds".equals(name)) { |
| transition = new ChangeBounds(); |
| newTransition = true; |
| } else if ("slide".equals(name)) { |
| transition = createSlideTransition(attrs); |
| newTransition = true; |
| } else if ("explode".equals(name)) { |
| transition = new Explode(); |
| newTransition = true; |
| } else if ("moveImage".equals(name)) { |
| transition = new MoveImage(); |
| newTransition = true; |
| } else if ("autoTransition".equals(name)) { |
| transition = new AutoTransition(); |
| newTransition = true; |
| } else if ("recolor".equals(name)) { |
| transition = new Recolor(); |
| newTransition = true; |
| } else if ("transitionSet".equals(name)) { |
| transition = new TransitionSet(); |
| TypedArray a = mContext.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.TransitionSet); |
| int ordering = a.getInt( |
| com.android.internal.R.styleable.TransitionSet_transitionOrdering, |
| TransitionSet.ORDERING_TOGETHER); |
| ((TransitionSet) transition).setOrdering(ordering); |
| createTransitionFromXml(parser, attrs, ((TransitionSet) transition)); |
| a.recycle(); |
| newTransition = true; |
| } else if ("targets".equals(name)) { |
| if (parser.getDepth() - 1 > depth && transition != null) { |
| // We're inside the child tag - add targets to the child |
| getTargetIds(parser, attrs, transition); |
| } else if (parser.getDepth() - 1 == depth && transitionSet != null) { |
| // add targets to the set |
| getTargetIds(parser, attrs, transitionSet); |
| } |
| } |
| if (transition != null || "targets".equals(name)) { |
| if (newTransition) { |
| loadTransition(transition, attrs); |
| if (transitionSet != null) { |
| transitionSet.addTransition(transition); |
| } |
| } |
| } else { |
| throw new RuntimeException("Unknown scene name: " + parser.getName()); |
| } |
| } |
| |
| return transition; |
| } |
| |
| private Slide createSlideTransition(AttributeSet attrs) { |
| TypedArray a = mContext.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.Slide); |
| int edge = a.getInt(com.android.internal.R.styleable.Slide_slideEdge, Slide.BOTTOM); |
| Slide slide = new Slide(edge); |
| a.recycle(); |
| return slide; |
| } |
| |
| private void getTargetIds(XmlPullParser parser, |
| AttributeSet attrs, Transition transition) throws XmlPullParserException, IOException { |
| |
| // Make sure we are on a start tag. |
| int type; |
| int depth = parser.getDepth(); |
| |
| ArrayList<Integer> targetIds = new ArrayList<Integer>(); |
| while (((type=parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) |
| && type != XmlPullParser.END_DOCUMENT) { |
| |
| if (type != XmlPullParser.START_TAG) { |
| continue; |
| } |
| |
| String name = parser.getName(); |
| if (name.equals("target")) { |
| TypedArray a = mContext.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.TransitionTarget); |
| int id = a.getResourceId( |
| com.android.internal.R.styleable.TransitionTarget_targetId, -1); |
| if (id >= 0) { |
| targetIds.add(id); |
| } |
| } else { |
| throw new RuntimeException("Unknown scene name: " + parser.getName()); |
| } |
| } |
| int numTargets = targetIds.size(); |
| if (numTargets > 0) { |
| for (int i = 0; i < numTargets; ++i) { |
| transition.addTarget(targetIds.get(i)); |
| } |
| } |
| } |
| |
| private Transition loadTransition(Transition transition, AttributeSet attrs) |
| throws Resources.NotFoundException { |
| |
| TypedArray a = |
| mContext.obtainStyledAttributes(attrs, com.android.internal.R.styleable.Transition); |
| long duration = a.getInt(com.android.internal.R.styleable.Transition_duration, -1); |
| if (duration >= 0) { |
| transition.setDuration(duration); |
| } |
| long startDelay = a.getInt(com.android.internal.R.styleable.Transition_startDelay, -1); |
| if (startDelay > 0) { |
| transition.setStartDelay(startDelay); |
| } |
| final int resID = |
| a.getResourceId(com.android.internal.R.styleable.Animator_interpolator, 0); |
| if (resID > 0) { |
| transition.setInterpolator(AnimationUtils.loadInterpolator(mContext, resID)); |
| } |
| a.recycle(); |
| return transition; |
| } |
| |
| // |
| // TransitionManager loading |
| // |
| |
| private TransitionManager createTransitionManagerFromXml(XmlPullParser parser, |
| AttributeSet attrs, ViewGroup sceneRoot) throws XmlPullParserException, IOException { |
| |
| // Make sure we are on a start tag. |
| int type; |
| int depth = parser.getDepth(); |
| TransitionManager transitionManager = null; |
| |
| while (((type=parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) |
| && type != XmlPullParser.END_DOCUMENT) { |
| |
| if (type != XmlPullParser.START_TAG) { |
| continue; |
| } |
| |
| String name = parser.getName(); |
| if (name.equals("transitionManager")) { |
| transitionManager = new TransitionManager(); |
| } else if (name.equals("transition") && (transitionManager != null)) { |
| loadTransition(attrs, sceneRoot, transitionManager); |
| } else { |
| throw new RuntimeException("Unknown scene name: " + parser.getName()); |
| } |
| } |
| return transitionManager; |
| } |
| |
| private void loadTransition(AttributeSet attrs, ViewGroup sceneRoot, |
| TransitionManager transitionManager) throws Resources.NotFoundException { |
| |
| TypedArray a = mContext.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.TransitionManager); |
| int transitionId = a.getResourceId( |
| com.android.internal.R.styleable.TransitionManager_transition, -1); |
| int fromId = a.getResourceId( |
| com.android.internal.R.styleable.TransitionManager_fromScene, -1); |
| Scene fromScene = (fromId < 0) ? null: Scene.getSceneForLayout(sceneRoot, fromId, mContext); |
| int toId = a.getResourceId( |
| com.android.internal.R.styleable.TransitionManager_toScene, -1); |
| Scene toScene = (toId < 0) ? null : Scene.getSceneForLayout(sceneRoot, toId, mContext); |
| |
| if (transitionId >= 0) { |
| Transition transition = inflateTransition(transitionId); |
| if (transition != null) { |
| if (toScene == null) { |
| throw new RuntimeException("No toScene for transition ID " + transitionId); |
| } |
| if (fromScene == null) { |
| transitionManager.setTransition(toScene, transition); |
| } else { |
| transitionManager.setTransition(fromScene, toScene, transition); |
| } |
| } |
| } |
| a.recycle(); |
| } |
| } |
