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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.menu;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Outline;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewOutlineProvider;
import android.widget.LinearLayout;
import com.android.tv.R;
/**
* A base class to render a card.
*/
public abstract class BaseCardView<T> extends LinearLayout implements ItemListRowView.CardView<T> {
private static final String TAG = "BaseCardView";
private static final boolean DEBUG = false;
private static final float SCALE_FACTOR_0F = 0f;
private static final float SCALE_FACTOR_1F = 1f;
private ValueAnimator mFocusAnimator;
private final int mFocusAnimDuration;
private final float mFocusTranslationZ;
private final float mVerticalCardMargin;
private final float mCardCornerRadius;
private float mFocusAnimatedValue;
public BaseCardView(Context context) {
this(context, null);
}
public BaseCardView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BaseCardView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setClipToOutline(true);
mFocusAnimDuration = getResources().getInteger(R.integer.menu_focus_anim_duration);
mFocusTranslationZ = getResources().getDimension(R.dimen.channel_card_elevation_focused)
- getResources().getDimension(R.dimen.card_elevation_normal);
mVerticalCardMargin = 2 * (
getResources().getDimensionPixelOffset(R.dimen.menu_list_padding_top)
+ getResources().getDimensionPixelOffset(R.dimen.menu_list_margin_top));
// Ensure the same elevation and focus animation for all subclasses.
setElevation(getResources().getDimension(R.dimen.card_elevation_normal));
mCardCornerRadius = getResources().getDimensionPixelSize(R.dimen.channel_card_round_radius);
setOutlineProvider(new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
outline.setRoundRect(0, 0, view.getWidth(), view.getHeight(), mCardCornerRadius);
}
});
}
/**
* Called when the view is displayed.
*/
@Override
public void onBind(T item, boolean selected) {
// Note that getCardHeight() will be called by setFocusAnimatedValue().
// Therefore, be sure that getCardHeight() has a proper value before this method is called.
setFocusAnimatedValue(selected ? SCALE_FACTOR_1F : SCALE_FACTOR_0F);
}
@Override
public void onRecycled() { }
@Override
public void onSelected() {
if (isAttachedToWindow() && getVisibility() == View.VISIBLE) {
startFocusAnimation(SCALE_FACTOR_1F);
} else {
cancelFocusAnimationIfAny();
setFocusAnimatedValue(SCALE_FACTOR_1F);
}
}
@Override
public void onDeselected() {
if (isAttachedToWindow() && getVisibility() == View.VISIBLE) {
startFocusAnimation(SCALE_FACTOR_0F);
} else {
cancelFocusAnimationIfAny();
setFocusAnimatedValue(SCALE_FACTOR_0F);
}
}
/**
* Called when the focus animation started.
*/
protected void onFocusAnimationStart(boolean selected) {
// do nothing.
}
/**
* Called when the focus animation ended.
*/
protected void onFocusAnimationEnd(boolean selected) {
// do nothing.
}
/**
* Called when the view is bound, or while focus animation is running with a value
* between {@code SCALE_FACTOR_0F} and {@code SCALE_FACTOR_1F}.
*/
protected void onSetFocusAnimatedValue(float animatedValue) {
float scale = 1f + (mVerticalCardMargin / getCardHeight()) * animatedValue;
setScaleX(scale);
setScaleY(scale);
setTranslationZ(mFocusTranslationZ * animatedValue);
}
private void setFocusAnimatedValue(float animatedValue) {
mFocusAnimatedValue = animatedValue;
onSetFocusAnimatedValue(animatedValue);
}
private void startFocusAnimation(final float targetAnimatedValue) {
cancelFocusAnimationIfAny();
final boolean selected = targetAnimatedValue == SCALE_FACTOR_1F;
mFocusAnimator = ValueAnimator.ofFloat(mFocusAnimatedValue, targetAnimatedValue);
mFocusAnimator.setDuration(mFocusAnimDuration);
mFocusAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
setHasTransientState(true);
onFocusAnimationStart(selected);
}
@Override
public void onAnimationEnd(Animator animation) {
setHasTransientState(false);
onFocusAnimationEnd(selected);
}
});
mFocusAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
setFocusAnimatedValue((Float) animation.getAnimatedValue());
}
});
mFocusAnimator.start();
}
private void cancelFocusAnimationIfAny() {
if (mFocusAnimator != null) {
mFocusAnimator.cancel();
mFocusAnimator = null;
}
}
/**
* The implementation should return the height of the card.
*/
protected abstract float getCardHeight();
}
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