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
17package com.android.browser.addbookmark;
18
19import android.content.Context;
20import android.view.View;
21import android.util.AttributeSet;
22import android.widget.AdapterView;
23import 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 */
29public 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