ListMenuItemView.java revision e7d468410b3a783560d5158a5798cef1b4b67702 
1/*
2 * Copyright (C) 2006 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.internal.view.menu;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.drawable.Drawable;
22import android.util.AttributeSet;
23import android.view.LayoutInflater;
24import android.view.View;
25import android.widget.CheckBox;
26import android.widget.CompoundButton;
27import android.widget.ImageView;
28import android.widget.LinearLayout;
29import android.widget.RadioButton;
30import android.widget.TextView;
31
32/**
33 * The item view for each item in the ListView-based MenuViews.
34 */
35public class ListMenuItemView extends LinearLayout implements MenuView.ItemView {
36    private MenuItemImpl mItemData;
37
38    private ImageView mIconView;
39    private RadioButton mRadioButton;
40    private TextView mTitleView;
41    private CheckBox mCheckBox;
42    private TextView mShortcutView;
43
44    private Drawable mBackground;
45    private int mTextAppearance;
46    private Context mTextAppearanceContext;
47    private boolean mPreserveIconSpacing;
48
49    private int mMenuType;
50
51    public ListMenuItemView(Context context, AttributeSet attrs, int defStyle) {
52        super(context, attrs);
53
54        TypedArray a =
55            context.obtainStyledAttributes(
56                attrs, com.android.internal.R.styleable.MenuView, defStyle, 0);
57
58        mBackground = a.getDrawable(com.android.internal.R.styleable.MenuView_itemBackground);
59        mTextAppearance = a.getResourceId(com.android.internal.R.styleable.
60                                          MenuView_itemTextAppearance, -1);
61        mPreserveIconSpacing = a.getBoolean(
62                com.android.internal.R.styleable.MenuView_preserveIconSpacing, false);
63        mTextAppearanceContext = context;
64
65        a.recycle();
66    }
67
68    public ListMenuItemView(Context context, AttributeSet attrs) {
69        this(context, attrs, 0);
70    }
71
72    @Override
73    protected void onFinishInflate() {
74        super.onFinishInflate();
75
76        setBackgroundDrawable(mBackground);
77
78        mTitleView = (TextView) findViewById(com.android.internal.R.id.title);
79        if (mTextAppearance != -1) {
80            mTitleView.setTextAppearance(mTextAppearanceContext,
81                                         mTextAppearance);
82        }
83
84        mShortcutView = (TextView) findViewById(com.android.internal.R.id.shortcut);
85    }
86
87    public void initialize(MenuItemImpl itemData, int menuType) {
88        mItemData = itemData;
89        mMenuType = menuType;
90
91        setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE);
92
93        setTitle(itemData.getTitleForItemView(this));
94        setCheckable(itemData.isCheckable());
95        setShortcut(itemData.shouldShowShortcut(), itemData.getShortcut());
96        setIcon(itemData.getIcon());
97        setEnabled(itemData.isEnabled());
98    }
99
100    public void setTitle(CharSequence title) {
101        if (title != null) {
102            mTitleView.setText(title);
103
104            if (mTitleView.getVisibility() != VISIBLE) mTitleView.setVisibility(VISIBLE);
105        } else {
106            if (mTitleView.getVisibility() != GONE) mTitleView.setVisibility(GONE);
107        }
108    }
109
110    public MenuItemImpl getItemData() {
111        return mItemData;
112    }
113
114    public void setCheckable(boolean checkable) {
115
116        if (!checkable && mRadioButton == null && mCheckBox == null) {
117            return;
118        }
119
120        if (mRadioButton == null) {
121            insertRadioButton();
122        }
123        if (mCheckBox == null) {
124            insertCheckBox();
125        }
126
127        // Depending on whether its exclusive check or not, the checkbox or
128        // radio button will be the one in use (and the other will be otherCompoundButton)
129        final CompoundButton compoundButton;
130        final CompoundButton otherCompoundButton;
131
132        if (mItemData.isExclusiveCheckable()) {
133            compoundButton = mRadioButton;
134            otherCompoundButton = mCheckBox;
135        } else {
136            compoundButton = mCheckBox;
137            otherCompoundButton = mRadioButton;
138        }
139
140        if (checkable) {
141            compoundButton.setChecked(mItemData.isChecked());
142
143            final int newVisibility = checkable ? VISIBLE : GONE;
144            if (compoundButton.getVisibility() != newVisibility) {
145                compoundButton.setVisibility(newVisibility);
146            }
147
148            // Make sure the other compound button isn't visible
149            if (otherCompoundButton.getVisibility() != GONE) {
150                otherCompoundButton.setVisibility(GONE);
151            }
152        } else {
153            mCheckBox.setVisibility(GONE);
154            mRadioButton.setVisibility(GONE);
155        }
156    }
157
158    public void setChecked(boolean checked) {
159        CompoundButton compoundButton;
160
161        if (mItemData.isExclusiveCheckable()) {
162            if (mRadioButton == null) {
163                insertRadioButton();
164            }
165            compoundButton = mRadioButton;
166        } else {
167            if (mCheckBox == null) {
168                insertCheckBox();
169            }
170            compoundButton = mCheckBox;
171        }
172
173        compoundButton.setChecked(checked);
174    }
175
176    public void setShortcut(boolean showShortcut, char shortcutKey) {
177        final int newVisibility = (showShortcut && mItemData.shouldShowShortcut())
178                ? VISIBLE : GONE;
179
180        if (newVisibility == VISIBLE) {
181            mShortcutView.setText(mItemData.getShortcutLabel());
182        }
183
184        if (mShortcutView.getVisibility() != newVisibility) {
185            mShortcutView.setVisibility(newVisibility);
186        }
187    }
188
189    public void setIcon(Drawable icon) {
190        final boolean showIcon = mItemData.shouldShowIcon(mMenuType);
191        if (!showIcon && !mPreserveIconSpacing) {
192            return;
193        }
194
195        if (mIconView == null && icon == null) {
196            return;
197        }
198
199        if (mIconView == null) {
200            insertIconView();
201        }
202
203        if (icon != null || mPreserveIconSpacing) {
204            mIconView.setImageDrawable(showIcon ? icon : null);
205
206            if (mIconView.getVisibility() != VISIBLE) {
207                mIconView.setVisibility(VISIBLE);
208            }
209        } else {
210            mIconView.setVisibility(GONE);
211        }
212    }
213
214    private void insertIconView() {
215        LayoutInflater inflater = mItemData.getLayoutInflater(mMenuType);
216        mIconView = (ImageView) inflater.inflate(com.android.internal.R.layout.list_menu_item_icon,
217                this, false);
218        addView(mIconView, 0);
219    }
220
221    private void insertRadioButton() {
222        LayoutInflater inflater = mItemData.getLayoutInflater(mMenuType);
223        mRadioButton =
224                (RadioButton) inflater.inflate(com.android.internal.R.layout.list_menu_item_radio,
225                this, false);
226        addView(mRadioButton);
227    }
228
229    private void insertCheckBox() {
230        LayoutInflater inflater = mItemData.getLayoutInflater(mMenuType);
231        mCheckBox =
232                (CheckBox) inflater.inflate(com.android.internal.R.layout.list_menu_item_checkbox,
233                this, false);
234        addView(mCheckBox);
235    }
236
237    public boolean prefersCondensedTitle() {
238        return false;
239    }
240
241    public boolean showsIcon() {
242        return false;
243    }
244
245}
246