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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.android.gallery3d.filtershow.category;
     18 
     19 import android.content.Context;
     20 import android.content.res.TypedArray;
     21 import android.database.DataSetObserver;
     22 import android.graphics.Rect;
     23 import android.util.AttributeSet;
     24 import android.util.Log;
     25 import android.view.MotionEvent;
     26 import android.view.View;
     27 import android.widget.LinearLayout;
     28 import com.android.gallery3d.R;
     29 
     30 public class CategoryTrack extends LinearLayout {
     31 
     32     private CategoryAdapter mAdapter;
     33     private int mElemSize;
     34     private View mSelectedView;
     35     private float mStartTouchY;
     36     private DataSetObserver mDataSetObserver = new DataSetObserver() {
     37         @Override
     38         public void onChanged() {
     39             super.onChanged();
     40             if (getChildCount() != mAdapter.getCount()) {
     41                 fillContent();
     42             } else {
     43                 invalidate();
     44             }
     45         }
     46         @Override
     47         public void onInvalidated() {
     48             super.onInvalidated();
     49             fillContent();
     50         }
     51     };
     52 
     53     public CategoryTrack(Context context, AttributeSet attrs) {
     54         super(context, attrs);
     55         TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.CategoryTrack);
     56         mElemSize = a.getDimensionPixelSize(R.styleable.CategoryTrack_iconSize, 0);
     57     }
     58 
     59     public void setAdapter(CategoryAdapter adapter) {
     60         mAdapter = adapter;
     61         mAdapter.registerDataSetObserver(mDataSetObserver);
     62         fillContent();
     63     }
     64 
     65     public void fillContent() {
     66         removeAllViews();
     67         mAdapter.setItemWidth(mElemSize);
     68         mAdapter.setItemHeight(LayoutParams.MATCH_PARENT);
     69         int n = mAdapter.getCount();
     70         for (int i = 0; i < n; i++) {
     71             View view = mAdapter.getView(i, null, this);
     72             addView(view, i);
     73         }
     74         requestLayout();
     75     }
     76 
     77     @Override
     78     public void invalidate() {
     79         for (int i = 0; i < this.getChildCount(); i++) {
     80             View child = getChildAt(i);
     81             child.invalidate();
     82         }
     83     }
     84 
     85 }
     86