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/*
* 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.view.transition;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ValueAnimator;
import android.graphics.Color;
import android.util.ArrayMap;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.Map;
/**
* This transition tracks changes to the text in TextView targets. If the text
* changes between the start and end scenes, the transition ensures that the
* starting text stays until the transition ends, at which point it changes
* to the end text. This is useful in situations where you want to resize a
* text view to its new size before displaying the text that goes there.
*/
public class TextChange extends Transition {
private static final String PROPNAME_TEXT = "android:textchange:text";
private static final String PROPNAME_TEXT_COLOR = "android:textchange:textColor";
private int mChangeBehavior = CHANGE_BEHAVIOR_KEEP;
/**
* Flag specifying that the text in affected/changing TextView targets will keep
* their original text during the transition, setting it to the final text when
* the transition ends. This is the default behavior.
*
* @see #setChangeBehavior(int)
*/
public static final int CHANGE_BEHAVIOR_KEEP = 0;
/**
* Flag specifying that the text changing animation should first fade
* out the original text completely. The new text is set on the target
* view at the end of the fade-out animation. This transition is typically
* used with a later {@link #CHANGE_BEHAVIOR_IN} transition, allowing more
* flexibility than the {@link #CHANGE_BEHAVIOR_OUT_IN} by allowing other
* transitions to be run sequentially or in parallel with these fades.
*
* @see #setChangeBehavior(int)
*/
public static final int CHANGE_BEHAVIOR_OUT = 1;
/**
* Flag specifying that the text changing animation should fade in the
* end text into the affected target view(s). This transition is typically
* used in conjunction with an earlier {@link #CHANGE_BEHAVIOR_OUT}
* transition, possibly with other transitions running as well, such as
* a sequence to fade out, then resize the view, then fade in.
*
* @see #setChangeBehavior(int)
*/
public static final int CHANGE_BEHAVIOR_IN = 2;
/**
* Flag specifying that the text changing animation should first fade
* out the original text completely and then fade in the
* new text.
*
* @see #setChangeBehavior(int)
*/
public static final int CHANGE_BEHAVIOR_OUT_IN = 3;
private static final String[] sTransitionProperties = {
PROPNAME_TEXT
};
/**
* Sets the type of changing animation that will be run, one of
* {@link #CHANGE_BEHAVIOR_KEEP} and {@link #CHANGE_BEHAVIOR_OUT_IN}.
*
* @param changeBehavior The type of fading animation to use when this
* transition is run.
*/
public void setChangeBehavior(int changeBehavior) {
if (changeBehavior >= CHANGE_BEHAVIOR_KEEP && changeBehavior <= CHANGE_BEHAVIOR_OUT_IN) {
mChangeBehavior = changeBehavior;
}
}
@Override
public String[] getTransitionProperties() {
return sTransitionProperties;
}
@Override
protected void captureValues(TransitionValues values, boolean start) {
if (values.view instanceof TextView) {
TextView textview = (TextView) values.view;
values.values.put(PROPNAME_TEXT, textview.getText());
if (mChangeBehavior > CHANGE_BEHAVIOR_KEEP) {
values.values.put(PROPNAME_TEXT_COLOR, textview.getCurrentTextColor());
}
}
}
@Override
protected Animator play(ViewGroup sceneRoot, TransitionValues startValues,
TransitionValues endValues) {
if (startValues == null || endValues == null || !(endValues.view instanceof TextView)) {
return null;
}
final TextView view = (TextView) endValues.view;
Map<String, Object> startVals = startValues.values;
Map<String, Object> endVals = endValues.values;
final String startText = (String) startVals.get(PROPNAME_TEXT);
final String endText = (String) endVals.get(PROPNAME_TEXT);
if (!startText.equals(endText)) {
view.setText(startText);
Animator anim;
if (mChangeBehavior == CHANGE_BEHAVIOR_KEEP) {
anim = ValueAnimator.ofFloat(0, 1);
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
if (startText.equals(view.getText())) {
// Only set if it hasn't been changed since anim started
view.setText(endText);
}
}
});
} else {
// Fade out start text
final int startColor = (Integer) startVals.get(PROPNAME_TEXT_COLOR);
final int endColor = (Integer) endVals.get(PROPNAME_TEXT_COLOR);
ValueAnimator outAnim = null, inAnim = null;
if (mChangeBehavior == CHANGE_BEHAVIOR_OUT_IN ||
mChangeBehavior == CHANGE_BEHAVIOR_OUT) {
outAnim = ValueAnimator.ofInt(255, 0);
outAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int currAlpha = (Integer) animation.getAnimatedValue();
view.setTextColor(currAlpha << 24 | Color.red(startColor) << 16 |
Color.green(startColor) << 8 | Color.red(startColor));
}
});
outAnim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
if (startText.equals(view.getText())) {
// Only set if it hasn't been changed since anim started
view.setText(endText);
}
}
});
}
if (mChangeBehavior == CHANGE_BEHAVIOR_OUT_IN ||
mChangeBehavior == CHANGE_BEHAVIOR_IN) {
inAnim = ValueAnimator.ofInt(0, 255);
inAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int currAlpha = (Integer) animation.getAnimatedValue();
view.setTextColor(currAlpha << 24 | Color.red(endColor) << 16 |
Color.green(endColor) << 8 | Color.red(endColor));
}
});
}
if (outAnim != null && inAnim != null) {
anim = new AnimatorSet();
((AnimatorSet) anim).playSequentially(outAnim, inAnim);
} else if (outAnim != null) {
anim = outAnim;
} else {
// Must be an in-only animation
anim = inAnim;
}
}
TransitionListener transitionListener = new TransitionListenerAdapter() {
boolean mCanceled = false;
@Override
public void onTransitionPause(Transition transition) {
view.setText(endText);
}
@Override
public void onTransitionResume(Transition transition) {
view.setText(startText);
}
};
addListener(transitionListener);
return anim;
}
return null;
}
}
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