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      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 {
     36         public void onSetCurrent(int index);
     37     }
     38 
     39     public PieStackView(Context ctx) {
     40         mMinHeight = (int) ctx.getResources()
     41                 .getDimension(R.dimen.qc_tab_title_height);
     42     }
     43 
     44     public void setOnCurrentListener(OnCurrentListener l) {
     45         mCurrentListener = l;
     46     }
     47 
     48     @Override
     49     public void setCurrent(int ix) {
     50         super.setCurrent(ix);
     51         if (mCurrentListener != null) {
     52             mCurrentListener.onSetCurrent(ix);
     53             buildViews();
     54             layoutChildrenLinear();
     55         }
     56     }
     57 
     58     /**
     59      * this will be called before the first draw call
     60      */
     61     @Override
     62     public void layout(int anchorX, int anchorY, boolean left, float angle) {
     63         super.layout(anchorX, anchorY, left, angle);
     64         buildViews();
     65         mWidth = mChildWidth;
     66         mHeight = mChildHeight + (mViews.size() - 1) * mMinHeight;
     67         mLeft = anchorX + (left ? SLOP : -(SLOP + mChildWidth));
     68         mTop = anchorY - mHeight / 2;
     69         if (mViews != null) {
     70             layoutChildrenLinear();
     71         }
     72     }
     73 
     74     private void layoutChildrenLinear() {
     75         final int n = mViews.size();
     76         int top = mTop;
     77         int dy = (n == 1) ? 0 : (mHeight - mChildHeight) / (n - 1);
     78         for (View view : mViews) {
     79             int x = mLeft;
     80             view.layout(x, top, x + mChildWidth, top + mChildHeight);
     81             top += dy;
     82         }
     83     }
     84 
     85     @Override
     86     public void draw(Canvas canvas) {
     87         if (mViews != null) {
     88             final int n = mViews.size();
     89             for (int i = 0; i < mCurrent; i++) {
     90                 drawView(mViews.get(i), canvas);
     91             }
     92             for (int i = n - 1; i > mCurrent; i--) {
     93                 drawView(mViews.get(i), canvas);
     94             }
     95             drawView(mViews.get(mCurrent), canvas);
     96         }
     97     }
     98 
     99     @Override
    100     protected int findChildAt(int y) {
    101         final int ix = (y - mTop) * mViews.size() / mHeight;
    102         return ix;
    103     }
    104 
    105 }
    106