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/*
* Copyright (C) 2017 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.launcher3.views;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Region;
import android.support.v4.graphics.ColorUtils;
import android.util.AttributeSet;
import android.widget.TextView;
import com.android.launcher3.BubbleTextView;
import com.android.launcher3.R;
/**
* Extension of {@link BubbleTextView} which draws two shadows on the text (ambient and key shadows}
*/
public class DoubleShadowBubbleTextView extends BubbleTextView {
private final ShadowInfo mShadowInfo;
public DoubleShadowBubbleTextView(Context context) {
this(context, null);
}
public DoubleShadowBubbleTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DoubleShadowBubbleTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mShadowInfo = new ShadowInfo(context, attrs, defStyle);
setShadowLayer(mShadowInfo.ambientShadowBlur, 0, 0, mShadowInfo.ambientShadowColor);
}
@Override
public void onDraw(Canvas canvas) {
// If text is transparent or shadow alpha is 0, don't draw any shadow
if (mShadowInfo.skipDoubleShadow(this)) {
super.onDraw(canvas);
return;
}
int alpha = Color.alpha(getCurrentTextColor());
// We enhance the shadow by drawing the shadow twice
getPaint().setShadowLayer(mShadowInfo.ambientShadowBlur, 0, 0,
ColorUtils.setAlphaComponent(mShadowInfo.ambientShadowColor, alpha));
drawWithoutBadge(canvas);
canvas.save(Canvas.CLIP_SAVE_FLAG);
canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(),
getScrollX() + getWidth(),
getScrollY() + getHeight(), Region.Op.INTERSECT);
getPaint().setShadowLayer(mShadowInfo.keyShadowBlur, 0.0f, mShadowInfo.keyShadowOffset,
ColorUtils.setAlphaComponent(mShadowInfo.keyShadowColor, alpha));
drawWithoutBadge(canvas);
canvas.restore();
drawBadgeIfNecessary(canvas);
}
public static class ShadowInfo {
public final float ambientShadowBlur;
public final int ambientShadowColor;
public final float keyShadowBlur;
public final float keyShadowOffset;
public final int keyShadowColor;
public ShadowInfo(Context c, AttributeSet attrs, int defStyle) {
TypedArray a = c.obtainStyledAttributes(
attrs, R.styleable.ShadowInfo, defStyle, 0);
ambientShadowBlur = a.getDimension(R.styleable.ShadowInfo_ambientShadowBlur, 0);
ambientShadowColor = a.getColor(R.styleable.ShadowInfo_ambientShadowColor, 0);
keyShadowBlur = a.getDimension(R.styleable.ShadowInfo_keyShadowBlur, 0);
keyShadowOffset = a.getDimension(R.styleable.ShadowInfo_keyShadowOffset, 0);
keyShadowColor = a.getColor(R.styleable.ShadowInfo_keyShadowColor, 0);
a.recycle();
}
public boolean skipDoubleShadow(TextView textView) {
int textAlpha = Color.alpha(textView.getCurrentTextColor());
int keyShadowAlpha = Color.alpha(keyShadowColor);
int ambientShadowAlpha = Color.alpha(ambientShadowColor);
if (textAlpha == 0 || (keyShadowAlpha == 0 && ambientShadowAlpha == 0)) {
textView.getPaint().clearShadowLayer();
return true;
} else if (ambientShadowAlpha > 0) {
textView.getPaint().setShadowLayer(ambientShadowBlur, 0, 0,
ColorUtils.setAlphaComponent(ambientShadowColor, textAlpha));
return true;
} else if (keyShadowAlpha > 0) {
textView.getPaint().setShadowLayer(keyShadowBlur, 0.0f, keyShadowOffset,
ColorUtils.setAlphaComponent(keyShadowColor, textAlpha));
return true;
} else {
return false;
}
}
}
}