InLineSettingItem.java revision 757459bc8ded7e5708d8ad99ff38a3cb41904640 
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 com.android.camera.ListPreference;
20import com.android.camera.R;
21
22import android.content.Context;
23import android.util.AttributeSet;
24import android.widget.LinearLayout;
25import android.widget.TextView;
26
27/**
28 * A one-line camera setting could be one of three types: knob, switch or restore
29 * preference button. The setting includes a title for showing the preference
30 * title which is initialized in the SimpleAdapter. A knob also includes
31 * (ex: Picture size), a previous button, the current value (ex: 5MP),
32 * and a next button. A switch, i.e. the preference RecordLocationPreference,
33 * has only two values on and off which will be controlled in a switch button.
34 * Other setting popup window includes several InLineSettingItem items with
35 * different types if possible.
36 */
37public abstract class InLineSettingItem extends LinearLayout {
38    private Listener mListener;
39    protected ListPreference mPreference;
40    protected int mIndex;
41    // Scene mode can override the original preference value.
42    protected String mOverrideValue;
43
44    static public interface Listener {
45        public void onSettingChanged();
46    }
47
48    public InLineSettingItem(Context context, AttributeSet attrs) {
49        super(context, attrs);
50    }
51
52    protected void setTitle(ListPreference preference) {
53        ((TextView) findViewById(R.id.title)).setText(preference.getTitle());
54    }
55
56    public void initialize(ListPreference preference) {
57        setTitle(preference);
58        if (preference == null) return;
59        mPreference = preference;
60        reloadPreference();
61    }
62
63    protected abstract void updateView();
64
65    protected boolean changeIndex(int index) {
66        if (index >= mPreference.getEntryValues().length || index < 0) return false;
67        mIndex = index;
68        mPreference.setValueIndex(mIndex);
69        if (mListener != null) {
70            mListener.onSettingChanged();
71        }
72        updateView();
73        return true;
74    }
75
76    // The value of the preference may have changed. Update the UI.
77    public void reloadPreference() {
78        mIndex = mPreference.findIndexOfValue(mPreference.getValue());
79        updateView();
80    }
81
82    public void setSettingChangedListener(Listener listener) {
83        mListener = listener;
84    }
85
86    public void overrideSettings(String value) {
87        mOverrideValue = value;
88        updateView();
89    }
90}
91