1 /*
2  * Copyright (C) 2011 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.android.browser.view;
18 
19 import com.android.browser.R;
20 
21 import android.content.Context;
22 import android.graphics.Canvas;
23 import android.view.View;
24 
25 /**
26  * shows views in a stack
27  */
28 public class PieStackView extends BasePieView {
29 
30     private static final int SLOP = 5;
31 
32     private OnCurrentListener mCurrentListener;
33     private int mMinHeight;
34 
35     public interface OnCurrentListener {
onSetCurrent(int index)36         public void onSetCurrent(int index);
37     }
38 
PieStackView(Context ctx)39     public PieStackView(Context ctx) {
40         mMinHeight = (int) ctx.getResources()
41                 .getDimension(R.dimen.qc_tab_title_height);
42     }
43 
setOnCurrentListener(OnCurrentListener l)44     public void setOnCurrentListener(OnCurrentListener l) {
45         mCurrentListener = l;
46     }
47 
48     @Override
setCurrent(int ix)49     public void setCurrent(int ix) {
50         super.setCurrent(ix);
51         if (mCurrentListener != null) {
52             mCurrentListener.onSetCurrent(ix);
53         }
54     }
55 
56     /**
57      * this will be called before the first draw call
58      */
59     @Override
layout(int anchorX, int anchorY, boolean left, float angle, int pHeight)60     public void layout(int anchorX, int anchorY, boolean left, float angle,
61             int pHeight) {
62         super.layout(anchorX, anchorY, left, angle, pHeight);
63         buildViews();
64         mWidth = mChildWidth;
65         mHeight = mChildHeight + (mViews.size() - 1) * mMinHeight;
66         mLeft = anchorX + (left ? SLOP : -(SLOP + mChildWidth));
67         mTop = anchorY - mHeight / 2;
68         if (mViews != null) {
69             layoutChildrenLinear();
70         }
71     }
72 
layoutChildrenLinear()73     private void layoutChildrenLinear() {
74         final int n = mViews.size();
75         int top = mTop;
76         int dy = (n == 1) ? 0 : (mHeight - mChildHeight) / (n - 1);
77         for (View view : mViews) {
78             int x = mLeft;
79             view.layout(x, top, x + mChildWidth, top + mChildHeight);
80             top += dy;
81         }
82     }
83 
84     @Override
draw(Canvas canvas)85     public void draw(Canvas canvas) {
86         if ((mViews != null) && (mCurrent > -1)) {
87             final int n = mViews.size();
88             for (int i = 0; i < mCurrent; i++) {
89                 drawView(mViews.get(i), canvas);
90             }
91             for (int i = n - 1; i > mCurrent; i--) {
92                 drawView(mViews.get(i), canvas);
93             }
94             drawView(mViews.get(mCurrent), canvas);
95         }
96     }
97 
98     @Override
findChildAt(int y)99     protected int findChildAt(int y) {
100         final int ix = (y - mTop) * mViews.size() / mHeight;
101         return ix;
102     }
103 
104 }
105