packages/SystemUI/src/com/android/systemui/statusbar/NotificationScrimView.java

/*
 * Copyright (C) 2014 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.statusbar;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;

import com.android.keyguard.R;

/**
 * A view that can be used for both the dimmed and normal background of an notification.
 */
public class NotificationScrimView extends View {

    private Drawable mBackground;
    private int mClipTopAmount;
    private int mActualHeight;

    public NotificationScrimView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mBackground = getResources().getDrawable(R.drawable.notification_scrim);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        draw(canvas, mBackground);
    }

    private void draw(Canvas canvas, Drawable drawable) {
        if (drawable != null) {
            drawable.setBounds(0, mClipTopAmount, getWidth(), mActualHeight);
            drawable.draw(canvas);
        }
    }

    @Override
    protected boolean verifyDrawable(Drawable who) {
        return super.verifyDrawable(who) || who == mBackground;
    }

    public void setActualHeight(int actualHeight) {
        mActualHeight = actualHeight;
        invalidate();
    }

    public int getActualHeight() {
        return mActualHeight;
    }

    public void setClipTopAmount(int clipTopAmount) {
        mClipTopAmount = clipTopAmount;
        invalidate();
    }

    @Override
    public boolean hasOverlappingRendering() {

        // Prevents this view from creating a layer when alpha is animating.
        return false;
    }
}