/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.views;
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import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.util.AttributeSet;
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import android.widget.TextView;
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import com.android.launcher3.BubbleTextView;
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import com.android.launcher3.R;
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/**
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* Extension of {@link BubbleTextView} which draws two shadows on the text (ambient and key shadows}
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*/
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public class DoubleShadowBubbleTextView extends BubbleTextView {
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private final ShadowInfo mShadowInfo;
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public DoubleShadowBubbleTextView(Context context) {
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this(context, null);
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}
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public DoubleShadowBubbleTextView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public DoubleShadowBubbleTextView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mShadowInfo = new ShadowInfo(context, attrs, defStyle);
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setShadowLayer(mShadowInfo.ambientShadowBlur, 0, 0, mShadowInfo.ambientShadowColor);
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}
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@Override
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public void onDraw(Canvas canvas) {
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// If text is transparent or shadow alpha is 0, don't draw any shadow
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if (mShadowInfo.skipDoubleShadow(this)) {
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super.onDraw(canvas);
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return;
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}
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int alpha = Color.alpha(getCurrentTextColor());
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// We enhance the shadow by drawing the shadow twice
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getPaint().setShadowLayer(mShadowInfo.ambientShadowBlur, 0, 0,
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setColorAlphaBound(mShadowInfo.ambientShadowColor, alpha));
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drawWithoutDot(canvas);
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canvas.save();
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canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(),
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getScrollX() + getWidth(),
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getScrollY() + getHeight());
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getPaint().setShadowLayer(mShadowInfo.keyShadowBlur, 0.0f, mShadowInfo.keyShadowOffset,
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setColorAlphaBound(mShadowInfo.keyShadowColor, alpha));
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drawWithoutDot(canvas);
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canvas.restore();
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drawDotIfNecessary(canvas);
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}
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public static class ShadowInfo {
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public final float ambientShadowBlur;
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public final int ambientShadowColor;
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public final float keyShadowBlur;
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public final float keyShadowOffset;
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public final int keyShadowColor;
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public ShadowInfo(Context c, AttributeSet attrs, int defStyle) {
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TypedArray a = c.obtainStyledAttributes(
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attrs, R.styleable.ShadowInfo, defStyle, 0);
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ambientShadowBlur = a.getDimension(R.styleable.ShadowInfo_ambientShadowBlur, 0);
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ambientShadowColor = a.getColor(R.styleable.ShadowInfo_ambientShadowColor, 0);
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keyShadowBlur = a.getDimension(R.styleable.ShadowInfo_keyShadowBlur, 0);
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keyShadowOffset = a.getDimension(R.styleable.ShadowInfo_keyShadowOffset, 0);
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keyShadowColor = a.getColor(R.styleable.ShadowInfo_keyShadowColor, 0);
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a.recycle();
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}
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public boolean skipDoubleShadow(TextView textView) {
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int textAlpha = Color.alpha(textView.getCurrentTextColor());
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int keyShadowAlpha = Color.alpha(keyShadowColor);
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int ambientShadowAlpha = Color.alpha(ambientShadowColor);
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if (textAlpha == 0 || (keyShadowAlpha == 0 && ambientShadowAlpha == 0)) {
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textView.getPaint().clearShadowLayer();
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return true;
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} else if (ambientShadowAlpha > 0) {
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textView.getPaint().setShadowLayer(ambientShadowBlur, 0, 0,
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setColorAlphaBound(ambientShadowColor, textAlpha));
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return true;
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} else if (keyShadowAlpha > 0) {
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textView.getPaint().setShadowLayer(keyShadowBlur, 0.0f, keyShadowOffset,
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setColorAlphaBound(keyShadowColor, textAlpha));
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return true;
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} else {
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return false;
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}
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}
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}
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}
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