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/*
* Copyright (C) 2015 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.tv.ui;
import android.animation.Animator;
import android.animation.ValueAnimator;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/** A class that includes convenience methods for view classes. */
public class ViewUtils {
private static final String TAG = "ViewUtils";
private ViewUtils() {
// Prevent instantiation.
}
public static void setTransitionAlpha(View v, float alpha) {
Method method;
try {
method = View.class.getDeclaredMethod("setTransitionAlpha", Float.TYPE);
method.invoke(v, alpha);
} catch (NoSuchMethodException
| IllegalAccessException
| IllegalArgumentException
| InvocationTargetException e) {
Log.e(TAG, "Fail to call View.setTransitionAlpha", e);
}
}
/**
* Creates an animator in view's height
*
* @param target the {@link view} animator performs on.
*/
public static Animator createHeightAnimator(
final View target, int initialHeight, int targetHeight) {
ValueAnimator animator = ValueAnimator.ofInt(initialHeight, targetHeight);
animator.addUpdateListener(
new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int value = (Integer) animation.getAnimatedValue();
if (value == 0) {
if (target.getVisibility() != View.GONE) {
target.setVisibility(View.GONE);
}
} else {
if (target.getVisibility() != View.VISIBLE) {
target.setVisibility(View.VISIBLE);
}
setLayoutHeight(target, value);
}
}
});
return animator;
}
/** Gets view's layout height. */
public static int getLayoutHeight(View view) {
LayoutParams layoutParams = view.getLayoutParams();
return layoutParams.height;
}
/** Sets view's layout height. */
public static void setLayoutHeight(View view, int height) {
LayoutParams layoutParams = view.getLayoutParams();
if (height != layoutParams.height) {
layoutParams.height = height;
view.setLayoutParams(layoutParams);
}
}
}
|
