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      1 /*
      2  * Copyright (C) 2009 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.contacts;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.graphics.Color;
     22 import android.graphics.Rect;
     23 import android.graphics.drawable.ColorDrawable;
     24 import android.graphics.drawable.Drawable;
     25 import android.util.AttributeSet;
     26 import android.view.MotionEvent;
     27 import android.view.View;
     28 import android.view.ViewParent;
     29 import android.widget.HorizontalScrollView;
     30 import android.widget.LinearLayout;
     31 
     32 /** Extension of LinearLayout that takes care of drawing bottom strips over the tab children. */
     33 public class TabStripView extends LinearLayout {
     34 
     35     private Drawable mBottomLeftStrip;
     36     private Drawable mBottomRightStrip;
     37     private int mSelectedTabIndex;
     38 
     39     public TabStripView(Context context) {
     40         this(context, null);
     41     }
     42 
     43     public TabStripView(Context context, AttributeSet attrs) {
     44         super(context, attrs);
     45         init();
     46     }
     47 
     48     private void init() {
     49         mGroupFlags |= FLAG_USE_CHILD_DRAWING_ORDER;
     50         mBottomLeftStrip = mContext.getResources().getDrawable(
     51                 R.drawable.tab_bottom);
     52         mBottomRightStrip = mContext.getResources().getDrawable(
     53                 R.drawable.tab_bottom);
     54     }
     55 
     56     public void setSelected(int index, boolean selected) {
     57         mSelectedTabIndex = index;
     58         getChildAt(index).setSelected(selected);
     59     }
     60 
     61     @Override
     62     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     63         ViewParent parent = getParent();
     64         if (parent instanceof HorizontalScrollView) {
     65             setMinimumWidth(((HorizontalScrollView) getParent()).getMeasuredWidth());
     66         }
     67 
     68         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     69     }
     70 
     71     @Override
     72     protected int getChildDrawingOrder(int childCount, int i) {
     73         // Always draw the selected tab last, so that drop shadows are drawn
     74         // in the correct z-order.
     75         if (i == childCount - 1) {
     76             return mSelectedTabIndex;
     77         } else if (i >= mSelectedTabIndex) {
     78             return i + 1;
     79         } else {
     80             return i;
     81         }
     82     }
     83 
     84     @Override
     85     public void childDrawableStateChanged(View child) {
     86         if (child == getChildAt(mSelectedTabIndex)) {
     87             // To make sure that the bottom strip is redrawn
     88             invalidate();
     89         }
     90         super.childDrawableStateChanged(child);
     91     }
     92 
     93     @Override
     94     public void dispatchDraw(Canvas canvas) {
     95         super.dispatchDraw(canvas);
     96 
     97         View selectedChild = getChildAt(mSelectedTabIndex);
     98 
     99         mBottomRightStrip.setState(selectedChild.getDrawableState());
    100         mBottomLeftStrip.setState(selectedChild.getDrawableState());
    101 
    102         Rect selBounds = new Rect(); // Bounds of the selected tab indicator
    103         selBounds.left = selectedChild.getLeft() - getScrollX();
    104         selBounds.right = selectedChild.getRight() - getScrollX();
    105         final int myHeight = getHeight();
    106         mBottomLeftStrip.setBounds(
    107                 Math.min(0, selBounds.left
    108                              - mBottomLeftStrip.getIntrinsicWidth()),
    109                 myHeight - mBottomLeftStrip.getIntrinsicHeight(),
    110                 selBounds.left,
    111                 myHeight);
    112         mBottomRightStrip.setBounds(
    113                 selBounds.right,
    114                 myHeight - mBottomRightStrip.getIntrinsicHeight(),
    115                 Math.max(getWidth(),
    116                         selBounds.right + mBottomRightStrip.getIntrinsicWidth()),
    117                 myHeight);
    118 
    119         mBottomLeftStrip.draw(canvas);
    120         mBottomRightStrip.draw(canvas);
    121     }
    122 
    123 }
    124