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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.addbookmark;
     18 
     19 import android.content.Context;
     20 import android.view.View;
     21 import android.util.AttributeSet;
     22 import android.widget.AdapterView;
     23 import android.widget.Spinner;
     24 
     25 /**
     26  * Special Spinner class with its own callback for when the selection is set, which
     27  * can be ignored by calling setSelectionIgnoringSelectionChange
     28  */
     29 public class FolderSpinner extends Spinner
     30         implements AdapterView.OnItemSelectedListener {
     31     private OnSetSelectionListener mOnSetSelectionListener;
     32     private boolean mFireSetSelection;
     33 
     34     /**
     35      * Callback for knowing when the selection has been manually set.  Does not
     36      * get called until the selected view has changed.
     37      */
     38     public interface OnSetSelectionListener {
     39         public void onSetSelection(long id);
     40     }
     41 
     42     public FolderSpinner(Context context, AttributeSet attrs) {
     43         super(context, attrs);
     44         super.setOnItemSelectedListener(this);
     45     }
     46 
     47     @Override
     48     public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener l) {
     49         // Disallow setting an OnItemSelectedListener, since it is used by us
     50         // to fire onSetSelection.
     51         throw new RuntimeException("Cannot set an OnItemSelectedListener on a FolderSpinner");
     52     }
     53 
     54     public void setOnSetSelectionListener(OnSetSelectionListener l) {
     55         mOnSetSelectionListener = l;
     56     }
     57 
     58     /**
     59      * Call setSelection, without firing the callback
     60      * @param position New position to select.
     61      */
     62     public void setSelectionIgnoringSelectionChange(int position) {
     63         super.setSelection(position);
     64     }
     65 
     66     @Override
     67     public void setSelection(int position) {
     68         mFireSetSelection = true;
     69         int oldPosition = getSelectedItemPosition();
     70         super.setSelection(position);
     71         if (mOnSetSelectionListener != null) {
     72             if (oldPosition == position) {
     73                 long id = getAdapter().getItemId(position);
     74                 // Normally this is not called because the item did not actually
     75                 // change, but in this case, we still want it to be called.
     76                 onItemSelected(this, null, position, id);
     77             }
     78         }
     79     }
     80 
     81     @Override
     82     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
     83         if (mFireSetSelection) {
     84             mOnSetSelectionListener.onSetSelection(id);
     85             mFireSetSelection = false;
     86         }
     87     }
     88 
     89     @Override
     90     public void onNothingSelected(AdapterView<?> parent) {}
     91 }
     92 
     93