InLineSettingItem.java revision 892781804513066b68b4a2fa6f846e862dac252a 
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
45    static public interface Listener {
46        public void onSettingChanged();
47    }
48
49    public InLineSettingItem(Context context, AttributeSet attrs) {
50        super(context, attrs);
51    }
52
53    protected void setTitle(ListPreference preference) {
54        ((TextView) findViewById(R.id.title)).setText(preference.getTitle());
55    }
56
57    public void initialize(ListPreference preference) {
58        setTitle(preference);
59        if (preference == null) return;
60        mPreference = preference;
61        reloadPreference();
62    }
63
64    protected abstract void updateView();
65
66    protected boolean changeIndex(int index) {
67        if (index >= mPreference.getEntryValues().length || index < 0) return false;
68        mIndex = index;
69        mPreference.setValueIndex(mIndex);
70        if (mListener != null) {
71            mListener.onSettingChanged();
72        }
73        updateView();
74        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
75        return true;
76    }
77
78    // The value of the preference may have changed. Update the UI.
79    public void reloadPreference() {
80        mIndex = mPreference.findIndexOfValue(mPreference.getValue());
81        updateView();
82    }
83
84    public void setSettingChangedListener(Listener listener) {
85        mListener = listener;
86    }
87
88    public void overrideSettings(String value) {
89        mOverrideValue = value;
90        updateView();
91    }
92}
93