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/*
* Copyright (C) 2020 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.systemui.util;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.Resources.Theme;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.DrawableWrapper;
import android.graphics.drawable.InsetDrawable;
import android.util.AttributeSet;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.android.systemui.R;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
/**
* An extension of {@link DrawableWrapper} that supports alpha and tint XML properties.
*
* {@link DrawableWrapper} supports setting these properties programmatically, but doesn't expose
* corresponding XML properties for some reason. This class allows to set these values in the XML,
* supporting theming.
*
* This class should only be used in XML.
*
* @attr ref android.R.styleable#DrawableWrapper_drawable
* @attr ref R.styleable#AlphaTintDrawableWrapper_tint
* @attr ref R.styleable#AlphaTintDrawableWrapper_alpha
*/
public class AlphaTintDrawableWrapper extends InsetDrawable {
private ColorStateList mTint;
private int[] mThemeAttrs;
/** No-arg constructor used by drawable inflation. */
public AlphaTintDrawableWrapper() {
super(null, 0);
}
AlphaTintDrawableWrapper(Drawable drawable, int[] themeAttrs) {
super(drawable, 0);
mThemeAttrs = themeAttrs;
}
@Override
public void inflate(@NonNull Resources r, @NonNull XmlPullParser parser,
@NonNull AttributeSet attrs, @Nullable Theme theme)
throws XmlPullParserException, IOException {
final TypedArray a = obtainAttributes(r, theme, attrs,
R.styleable.AlphaTintDrawableWrapper);
super.inflate(r, parser, attrs, theme);
mThemeAttrs = a.extractThemeAttrs();
updateStateFromTypedArray(a);
a.recycle();
applyTint();
}
@Override
public void applyTheme(Theme t) {
super.applyTheme(t);
if (mThemeAttrs != null && t != null) {
final TypedArray a = t.resolveAttributes(mThemeAttrs,
R.styleable.AlphaTintDrawableWrapper);
updateStateFromTypedArray(a);
a.recycle();
}
// Ensure tint is reapplied after applying the theme to ensure this drawables'
// tint overrides the underlying drawables' tint.
applyTint();
}
@Override
public boolean canApplyTheme() {
return (mThemeAttrs != null && mThemeAttrs.length > 0) || super.canApplyTheme();
}
private void updateStateFromTypedArray(@NonNull TypedArray a) {
if (a.hasValue(R.styleable.AlphaTintDrawableWrapper_android_tint)) {
mTint = a.getColorStateList(R.styleable.AlphaTintDrawableWrapper_android_tint);
}
if (a.hasValue(R.styleable.AlphaTintDrawableWrapper_android_alpha)) {
float alpha = a.getFloat(R.styleable.AlphaTintDrawableWrapper_android_alpha, 1);
setAlpha(Math.round(alpha * 255));
}
}
@Override
public void setTintList(ColorStateList tint) {
super.setTintList(tint);
mTint = tint;
}
private void applyTint() {
if (getDrawable() != null && mTint != null) {
getDrawable().mutate().setTintList(mTint);
}
}
@Nullable
@Override
public ConstantState getConstantState() {
return new AlphaTintState(super.getConstantState(), mThemeAttrs, getAlpha(), mTint);
}
static class AlphaTintState extends Drawable.ConstantState {
private ConstantState mWrappedState;
private int[] mThemeAttrs;
private int mAlpha;
private ColorStateList mColorStateList;
AlphaTintState(
ConstantState wrappedState,
int[] themeAttrs,
int alpha,
ColorStateList colorStateList
) {
mWrappedState = wrappedState;
mThemeAttrs = themeAttrs;
mAlpha = alpha;
mColorStateList = colorStateList;
}
@NonNull
@Override
public Drawable newDrawable() {
return newDrawable(null, null);
}
@NonNull
@Override
public Drawable newDrawable(Resources res, Theme theme) {
DrawableWrapper wrapper = (DrawableWrapper) mWrappedState.newDrawable(res, theme);
AlphaTintDrawableWrapper alphaTintDrawableWrapper =
new AlphaTintDrawableWrapper(wrapper.getDrawable(), mThemeAttrs);
alphaTintDrawableWrapper.setTintList(mColorStateList);
alphaTintDrawableWrapper.setAlpha(mAlpha);
return alphaTintDrawableWrapper;
}
@Override
public boolean canApplyTheme() {
return true;
}
@Override
public int getChangingConfigurations() {
return mWrappedState.getChangingConfigurations();
}
}
}
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