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      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.insertingcells;
     18 
     19 import android.animation.ObjectAnimator;
     20 import android.animation.PropertyValuesHolder;
     21 import android.animation.ValueAnimator;
     22 import android.content.Context;
     23 import android.graphics.Canvas;
     24 import android.graphics.Color;
     25 import android.graphics.Paint;
     26 import android.util.AttributeSet;
     27 import android.view.View;
     28 
     29 /**
     30  * This round view draws a circle from which the image pops out of and into
     31  * the corresponding cell in the list.
     32  */
     33 public class RoundView extends View {
     34 
     35     private final int STROKE_WIDTH = 6;
     36     private final int RADIUS = 20;
     37     private final int ANIMATION_DURATION = 300;
     38     private final float SCALE_FACTOR = 0.3f;
     39 
     40     private Paint mPaint;
     41 
     42     public RoundView(Context context) {
     43         super(context);
     44         init();
     45     }
     46 
     47     public RoundView(Context context, AttributeSet attrs) {
     48         super(context, attrs);
     49         init();
     50     }
     51 
     52     public RoundView(Context context, AttributeSet attrs, int defStyle) {
     53         super(context, attrs, defStyle);
     54         init();
     55     }
     56 
     57     private void init() {
     58         mPaint = new Paint();
     59         mPaint.setAntiAlias(true);
     60         mPaint.setColor(Color.WHITE);
     61         mPaint.setStyle(Paint.Style.STROKE);
     62         mPaint.setStrokeWidth(STROKE_WIDTH);
     63     }
     64 
     65     @Override
     66     protected void onDraw(Canvas canvas) {
     67         canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2,
     68                 RADIUS, mPaint);
     69     }
     70 
     71     public ObjectAnimator getScalingAnimator() {
     72         PropertyValuesHolder imgViewScaleY = PropertyValuesHolder.ofFloat(View
     73                 .SCALE_Y, SCALE_FACTOR);
     74         PropertyValuesHolder imgViewScaleX = PropertyValuesHolder.ofFloat(View
     75                 .SCALE_X, SCALE_FACTOR);
     76 
     77         ObjectAnimator imgViewScaleAnimator = ObjectAnimator
     78                 .ofPropertyValuesHolder(this, imgViewScaleX, imgViewScaleY);
     79         imgViewScaleAnimator.setRepeatCount(1);
     80         imgViewScaleAnimator.setRepeatMode(ValueAnimator.REVERSE);
     81         imgViewScaleAnimator.setDuration(ANIMATION_DURATION);
     82 
     83         return imgViewScaleAnimator;
     84     }
     85 }
     86