| /* |
| * Copyright (C) 2013 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.example.android.listviewitemanimations; |
| |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.widget.FrameLayout; |
| |
| public class BackgroundContainer extends FrameLayout { |
| |
| boolean mShowing = false; |
| Drawable mShadowedBackground; |
| int mOpenAreaTop, mOpenAreaBottom, mOpenAreaHeight; |
| boolean mUpdateBounds = false; |
| |
| public BackgroundContainer(Context context) { |
| super(context); |
| init(); |
| } |
| |
| public BackgroundContainer(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| init(); |
| } |
| |
| public BackgroundContainer(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| init(); |
| } |
| |
| private void init() { |
| mShadowedBackground = getContext().getResources().getDrawable(R.drawable.shadowed_background); |
| } |
| |
| public void showBackground(int top, int bottom) { |
| setWillNotDraw(false); |
| mOpenAreaTop = top; |
| mOpenAreaHeight = bottom; |
| mShowing = true; |
| mUpdateBounds = true; |
| } |
| |
| public void hideBackground() { |
| setWillNotDraw(true); |
| mShowing = false; |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| if (mShowing) { |
| if (mUpdateBounds) { |
| mShadowedBackground.setBounds(0, 0, getWidth(), mOpenAreaHeight); |
| } |
| canvas.save(); |
| canvas.translate(0, mOpenAreaTop); |
| mShadowedBackground.draw(canvas); |
| canvas.restore(); |
| } |
| } |
| |
| } |