packages/SystemUI/src/com/android/systemui/statusbar/ExpandableOutlineView.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.Outline;
import android.util.AttributeSet;
import android.widget.FrameLayout;

/**
 * Like {@link ExpandableView}, but setting an outline for the height and clipping.
 */
public abstract class ExpandableOutlineView extends ExpandableView {

    private final Outline mOutline = new Outline();

    public ExpandableOutlineView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setActualHeight(int actualHeight) {
        super.setActualHeight(actualHeight);
        updateOutline();
    }

    @Override
    public void setClipTopAmount(int clipTopAmount) {
        super.setClipTopAmount(clipTopAmount);
        updateOutline();
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        updateOutline();
    }

    private void updateOutline() {
        mOutline.setRect(0,
                mClipTopAmount,
                getWidth(),
                Math.max(mActualHeight, mClipTopAmount));
        setOutline(mOutline);
    }
}