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
17package com.android.quicksearchbox.ui;
18
19import com.android.quicksearchbox.R;
20import com.android.quicksearchbox.SuggestionPosition;
21
22import android.content.Context;
23import android.util.AttributeSet;
24import android.util.Log;
25import android.view.View;
26import android.widget.FrameLayout;
27import android.widget.ListAdapter;
28import android.widget.ListView;
29
30/**
31 * Holds a list of suggestions.
32 */
33public 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
41    public SuggestionsView(Context context, AttributeSet attrs) {
42        super(context, attrs);
43    }
44
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
53    public SuggestionsAdapter<ListAdapter> getSuggestionsAdapter() {
54        return mSuggestionsAdapter;
55    }
56
57    @Override
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     */
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     */
77    public SuggestionPosition getSelectedSuggestion() {
78        return (SuggestionPosition) getSelectedItem();
79    }
80
81    public void setLimitSuggestionsToViewHeight(boolean limit) {
82        mLimitSuggestionsToViewHeight = limit;
83        if (mLimitSuggestionsToViewHeight) {
84            setMaxPromotedByHeight();
85        }
86    }
87
88    @Override
89    protected void onSizeChanged (int w, int h, int oldw, int oldh) {
90        if (mLimitSuggestionsToViewHeight) {
91            setMaxPromotedByHeight();
92        }
93    }
94
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