Home | History | Annotate | Download | only in listviewitemanimations 
      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.listviewitemanimations;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.graphics.drawable.Drawable;
     22 import android.util.AttributeSet;
     23 import android.widget.FrameLayout;
     24 
     25 public class BackgroundContainer extends FrameLayout {
     26 
     27     boolean mShowing = false;
     28     Drawable mShadowedBackground;
     29     int mOpenAreaTop, mOpenAreaBottom, mOpenAreaHeight;
     30     boolean mUpdateBounds = false;
     31 
     32     public BackgroundContainer(Context context) {
     33         super(context);
     34         init();
     35     }
     36 
     37     public BackgroundContainer(Context context, AttributeSet attrs) {
     38         super(context, attrs);
     39         init();
     40     }
     41 
     42     public BackgroundContainer(Context context, AttributeSet attrs, int defStyle) {
     43         super(context, attrs, defStyle);
     44         init();
     45     }
     46 
     47     private void init() {
     48         mShadowedBackground = getContext().getResources().getDrawable(R.drawable.shadowed_background);
     49     }
     50 
     51     public void showBackground(int top, int bottom) {
     52         setWillNotDraw(false);
     53         mOpenAreaTop = top;
     54         mOpenAreaHeight = bottom;
     55         mShowing = true;
     56         mUpdateBounds = true;
     57     }
     58 
     59     public void hideBackground() {
     60         setWillNotDraw(true);
     61         mShowing = false;
     62     }
     63 
     64     @Override
     65     protected void onDraw(Canvas canvas) {
     66         if (mShowing) {
     67             if (mUpdateBounds) {
     68                 mShadowedBackground.setBounds(0, 0, getWidth(), mOpenAreaHeight);
     69             }
     70             canvas.save();
     71             canvas.translate(0, mOpenAreaTop);
     72             mShadowedBackground.draw(canvas);
     73             canvas.restore();
     74         }
     75     }
     76 
     77 }
     78