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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.quicksearchbox.ui;
18 
19 import com.android.quicksearchbox.R;
20 import com.android.quicksearchbox.SuggestionPosition;
21 
22 import android.content.Context;
23 import android.util.AttributeSet;
24 import android.util.Log;
25 import android.view.View;
26 import android.widget.FrameLayout;
27 import android.widget.ListAdapter;
28 import android.widget.ListView;
29 
30 /**
31  * Holds a list of suggestions.
32  */
33 public class SuggestionsView extends ListView implements SuggestionsListView<ListAdapter> {
34 
35     private static final boolean DBG = false;
36     private static final String TAG = "QSB.SuggestionsView";
37 
38     private boolean mLimitSuggestionsToViewHeight;
39     private SuggestionsAdapter<ListAdapter> mSuggestionsAdapter;
40 
SuggestionsView(Context context, AttributeSet attrs)41     public SuggestionsView(Context context, AttributeSet attrs) {
42         super(context, attrs);
43     }
44 
setSuggestionsAdapter(SuggestionsAdapter<ListAdapter> adapter)45     public void setSuggestionsAdapter(SuggestionsAdapter<ListAdapter> adapter) {
46         super.setAdapter(adapter == null ? null : adapter.getListAdapter());
47         mSuggestionsAdapter = adapter;
48         if (mLimitSuggestionsToViewHeight) {
49             setMaxPromotedByHeight();
50         }
51     }
52 
getSuggestionsAdapter()53     public SuggestionsAdapter<ListAdapter> getSuggestionsAdapter() {
54         return mSuggestionsAdapter;
55     }
56 
57     @Override
onFinishInflate()58     public void onFinishInflate() {
59         super.onFinishInflate();
60         setItemsCanFocus(true);
61     }
62 
63     /**
64      * Gets the position of the selected suggestion.
65      *
66      * @return A 0-based index, or {@code -1} if no suggestion is selected.
67      */
getSelectedPosition()68     public int getSelectedPosition() {
69         return getSelectedItemPosition();
70     }
71 
72     /**
73      * Gets the selected suggestion.
74      *
75      * @return {@code null} if no suggestion is selected.
76      */
getSelectedSuggestion()77     public SuggestionPosition getSelectedSuggestion() {
78         return (SuggestionPosition) getSelectedItem();
79     }
80 
setLimitSuggestionsToViewHeight(boolean limit)81     public void setLimitSuggestionsToViewHeight(boolean limit) {
82         mLimitSuggestionsToViewHeight = limit;
83         if (mLimitSuggestionsToViewHeight) {
84             setMaxPromotedByHeight();
85         }
86     }
87 
88     @Override
onSizeChanged(int w, int h, int oldw, int oldh)89     protected void onSizeChanged (int w, int h, int oldw, int oldh) {
90         if (mLimitSuggestionsToViewHeight) {
91             setMaxPromotedByHeight();
92         }
93     }
94 
setMaxPromotedByHeight()95     private void setMaxPromotedByHeight() {
96         if (mSuggestionsAdapter != null) {
97             float maxHeight;
98             if (getParent() instanceof FrameLayout) {
99                 // We put the SuggestionView inside a frame layout so that we know what its
100                 // maximum height is. Since this views height is set to 'wrap content' (in two-pane
101                 // mode at least), we can't use our own height for these calculations.
102                 maxHeight = ((View) getParent()).getHeight();
103                 if (DBG) Log.d(TAG, "Parent height=" + maxHeight);
104             } else {
105                 maxHeight = getHeight();
106                 if (DBG) Log.d(TAG, "This height=" + maxHeight);
107             }
108             float suggestionHeight =
109                 getContext().getResources().getDimension(R.dimen.suggestion_view_height);
110             if (suggestionHeight != 0) {
111                 int suggestions = Math.max(1, (int) Math.floor(maxHeight / suggestionHeight));
112                 if (DBG) {
113                     Log.d(TAG, "view height=" + maxHeight + " suggestion height=" +
114                             suggestionHeight + " -> maxSuggestions=" + suggestions);
115                 }
116                 mSuggestionsAdapter.setMaxPromoted(suggestions);
117             }
118         }
119     }
120 
121 }
122