/*
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* Copyright (C) 2014 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.systemui.statusbar.policy;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ColorFilter;
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import android.graphics.Paint;
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import android.graphics.PixelFormat;
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import android.graphics.RadialGradient;
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import android.graphics.Rect;
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import android.graphics.Shader;
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import android.graphics.drawable.Drawable;
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import android.util.LayoutDirection;
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import android.view.View;
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import com.android.systemui.R;
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/**
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* Gradient background for the user switcher on Keyguard.
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*/
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public class KeyguardUserSwitcherScrim extends Drawable
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implements View.OnLayoutChangeListener {
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private static final float OUTER_EXTENT = 2.5f;
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private static final float INNER_EXTENT = 0.75f;
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private int mDarkColor;
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private int mTop;
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private int mAlpha = 255;
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private Paint mRadialGradientPaint = new Paint();
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private int mLayoutWidth;
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public KeyguardUserSwitcherScrim(Context context) {
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mDarkColor = context.getColor(
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R.color.keyguard_user_switcher_background_gradient_color);
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}
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@Override
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public void draw(Canvas canvas) {
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boolean isLtr = getLayoutDirection() == LayoutDirection.LTR;
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Rect bounds = getBounds();
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float width = bounds.width() * OUTER_EXTENT;
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float height = (mTop + bounds.height()) * OUTER_EXTENT;
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canvas.translate(0, -mTop);
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canvas.scale(1, height / width);
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canvas.drawRect(isLtr ? bounds.right - width : 0, 0,
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isLtr ? bounds.right : bounds.left + width, width, mRadialGradientPaint);
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}
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@Override
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public void setAlpha(int alpha) {
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mAlpha = alpha;
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updatePaint();
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invalidateSelf();
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}
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@Override
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public int getAlpha() {
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return mAlpha;
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}
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@Override
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public void setColorFilter(ColorFilter colorFilter) {
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}
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@Override
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public int getOpacity() {
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return PixelFormat.TRANSLUCENT;
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}
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@Override
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public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
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int oldTop, int oldRight, int oldBottom) {
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if (left != oldLeft || top != oldTop || right != oldRight || bottom != oldBottom) {
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mLayoutWidth = right - left;
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mTop = top;
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updatePaint();
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}
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}
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private void updatePaint() {
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if (mLayoutWidth == 0) {
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return;
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}
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float radius = mLayoutWidth * OUTER_EXTENT;
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boolean isLtr = getLayoutDirection() == LayoutDirection.LTR;
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mRadialGradientPaint.setShader(
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new RadialGradient(isLtr ? mLayoutWidth : 0, 0, radius,
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new int[] { Color.argb(
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(int) (Color.alpha(mDarkColor) * mAlpha / 255f), 0, 0, 0),
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Color.TRANSPARENT },
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new float[] { Math.max(0f, mLayoutWidth * INNER_EXTENT / radius), 1f },
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Shader.TileMode.CLAMP));
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}
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}
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