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.camera.ui;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.view.accessibility.AccessibilityEvent;
22import android.widget.LinearLayout;
23import android.widget.TextView;
24
25import com.android.camera.ListPreference;
26import com.android.camera.R;
27
28/**
29 * A one-line camera setting could be one of three types: knob, switch or restore
30 * preference button. The setting includes a title for showing the preference
31 * title which is initialized in the SimpleAdapter. A knob also includes
32 * (ex: Picture size), a previous button, the current value (ex: 5MP),
33 * and a next button. A switch, i.e. the preference RecordLocationPreference,
34 * has only two values on and off which will be controlled in a switch button.
35 * Other setting popup window includes several InLineSettingItem items with
36 * different types if possible.
37 */
38public abstract class InLineSettingItem extends LinearLayout {
39    private Listener mListener;
40    protected ListPreference mPreference;
41    protected int mIndex;
42    // Scene mode can override the original preference value.
43    protected String mOverrideValue;
44    protected TextView mTitle;
45
46    static public interface Listener {
47        public void onSettingChanged(ListPreference pref);
48    }
49
50    public InLineSettingItem(Context context, AttributeSet attrs) {
51        super(context, attrs);
52    }
53
54    protected void setTitle(ListPreference preference) {
55        mTitle = ((TextView) findViewById(R.id.title));
56        mTitle.setText(preference.getTitle());
57    }
58
59    public void initialize(ListPreference preference) {
60        setTitle(preference);
61        if (preference == null) return;
62        mPreference = preference;
63        reloadPreference();
64    }
65
66    protected abstract void updateView();
67
68    protected boolean changeIndex(int index) {
69        if (index >= mPreference.getEntryValues().length || index < 0) return false;
70        mIndex = index;
71        mPreference.setValueIndex(mIndex);
72        if (mListener != null) {
73            mListener.onSettingChanged(mPreference);
74        }
75        updateView();
76        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
77        return true;
78    }
79
80    // The value of the preference may have changed. Update the UI.
81    public void reloadPreference() {
82        mIndex = mPreference.findIndexOfValue(mPreference.getValue());
83        updateView();
84    }
85
86    public void setSettingChangedListener(Listener listener) {
87        mListener = listener;
88    }
89
90    public void overrideSettings(String value) {
91        mOverrideValue = value;
92        updateView();
93    }
94}
95