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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.launcher2;
     18 
     19 import android.content.Context;
     20 import android.view.MotionEvent;
     21 import android.view.View;
     22 import android.widget.FrameLayout;
     23 import android.widget.GridLayout;
     24 
     25 /**
     26  * The grid based layout used strictly for the widget/wallpaper tab of the AppsCustomize pane
     27  */
     28 public class PagedViewGridLayout extends GridLayout implements Page {
     29     static final String TAG = "PagedViewGridLayout";
     30 
     31     private int mCellCountX;
     32     private int mCellCountY;
     33     private Runnable mOnLayoutListener;
     34 
     35     public PagedViewGridLayout(Context context, int cellCountX, int cellCountY) {
     36         super(context, null, 0);
     37         mCellCountX = cellCountX;
     38         mCellCountY = cellCountY;
     39     }
     40 
     41     int getCellCountX() {
     42         return mCellCountX;
     43     }
     44 
     45     int getCellCountY() {
     46         return mCellCountY;
     47     }
     48 
     49     /**
     50      * Clears all the key listeners for the individual widgets.
     51      */
     52     public void resetChildrenOnKeyListeners() {
     53         int childCount = getChildCount();
     54         for (int j = 0; j < childCount; ++j) {
     55             getChildAt(j).setOnKeyListener(null);
     56         }
     57     }
     58 
     59     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     60         // PagedView currently has issues with different-sized pages since it calculates the
     61         // offset of each page to scroll to before it updates the actual size of each page
     62         // (which can change depending on the content if the contents aren't a fixed size).
     63         // We work around this by having a minimum size on each widget page).
     64         int widthSpecSize = Math.min(getSuggestedMinimumWidth(),
     65                 MeasureSpec.getSize(widthMeasureSpec));
     66         int widthSpecMode = MeasureSpec.EXACTLY;
     67         super.onMeasure(MeasureSpec.makeMeasureSpec(widthSpecSize, widthSpecMode),
     68                 heightMeasureSpec);
     69     }
     70 
     71     @Override
     72     protected void onDetachedFromWindow() {
     73         super.onDetachedFromWindow();
     74         mOnLayoutListener = null;
     75     }
     76 
     77     public void setOnLayoutListener(Runnable r) {
     78         mOnLayoutListener = r;
     79     }
     80 
     81     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
     82         super.onLayout(changed, left, top, right, bottom);
     83         if (mOnLayoutListener != null) {
     84             mOnLayoutListener.run();
     85         }
     86     }
     87 
     88     @Override
     89     public boolean onTouchEvent(MotionEvent event) {
     90         boolean result = super.onTouchEvent(event);
     91         int count = getPageChildCount();
     92         if (count > 0) {
     93             // We only intercept the touch if we are tapping in empty space after the final row
     94             View child = getChildOnPageAt(count - 1);
     95             int bottom = child.getBottom();
     96             result = result || (event.getY() < bottom);
     97         }
     98         return result;
     99     }
    100 
    101     @Override
    102     public void removeAllViewsOnPage() {
    103         removeAllViews();
    104         mOnLayoutListener = null;
    105         setLayerType(LAYER_TYPE_NONE, null);
    106     }
    107 
    108     @Override
    109     public void removeViewOnPageAt(int index) {
    110         removeViewAt(index);
    111     }
    112 
    113     @Override
    114     public int getPageChildCount() {
    115         return getChildCount();
    116     }
    117 
    118     @Override
    119     public View getChildOnPageAt(int i) {
    120         return getChildAt(i);
    121     }
    122 
    123     @Override
    124     public int indexOfChildOnPage(View v) {
    125         return indexOfChild(v);
    126     }
    127 
    128     public static class LayoutParams extends FrameLayout.LayoutParams {
    129         public LayoutParams(int width, int height) {
    130             super(width, height);
    131         }
    132     }
    133 }
    134