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.view.ViewGroup;
26import android.widget.CheckBox;
27import android.widget.CompoundButton;
28import android.widget.ImageView;
29import android.widget.LinearLayout;
30import android.widget.RadioButton;
31import android.widget.TextView;
32
33/**
34 * The item view for each item in the ListView-based MenuViews.
35 */
36public class ListMenuItemView extends LinearLayout implements MenuView.ItemView {
37    private static final String TAG = "ListMenuItemView";
38    private MenuItemImpl mItemData;
39
40    private ImageView mIconView;
41    private RadioButton mRadioButton;
42    private TextView mTitleView;
43    private CheckBox mCheckBox;
44    private TextView mShortcutView;
45
46    private Drawable mBackground;
47    private int mTextAppearance;
48    private Context mTextAppearanceContext;
49    private boolean mPreserveIconSpacing;
50
51    private int mMenuType;
52
53    private LayoutInflater mInflater;
54
55    private boolean mForceShowIcon;
56
57    public ListMenuItemView(Context context, AttributeSet attrs, int defStyle) {
58        super(context, attrs);
59
60        TypedArray a =
61            context.obtainStyledAttributes(
62                attrs, com.android.internal.R.styleable.MenuView, defStyle, 0);
63
64        mBackground = a.getDrawable(com.android.internal.R.styleable.MenuView_itemBackground);
65        mTextAppearance = a.getResourceId(com.android.internal.R.styleable.
66                                          MenuView_itemTextAppearance, -1);
67        mPreserveIconSpacing = a.getBoolean(
68                com.android.internal.R.styleable.MenuView_preserveIconSpacing, false);
69        mTextAppearanceContext = context;
70
71        a.recycle();
72    }
73
74    public ListMenuItemView(Context context, AttributeSet attrs) {
75        this(context, attrs, 0);
76    }
77
78    @Override
79    protected void onFinishInflate() {
80        super.onFinishInflate();
81
82        setBackgroundDrawable(mBackground);
83
84        mTitleView = (TextView) findViewById(com.android.internal.R.id.title);
85        if (mTextAppearance != -1) {
86            mTitleView.setTextAppearance(mTextAppearanceContext,
87                                         mTextAppearance);
88        }
89
90        mShortcutView = (TextView) findViewById(com.android.internal.R.id.shortcut);
91    }
92
93    public void initialize(MenuItemImpl itemData, int menuType) {
94        mItemData = itemData;
95        mMenuType = menuType;
96
97        setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE);
98
99        setTitle(itemData.getTitleForItemView(this));
100        setCheckable(itemData.isCheckable());
101        setShortcut(itemData.shouldShowShortcut(), itemData.getShortcut());
102        setIcon(itemData.getIcon());
103        setEnabled(itemData.isEnabled());
104    }
105
106    public void setForceShowIcon(boolean forceShow) {
107        mPreserveIconSpacing = mForceShowIcon = forceShow;
108    }
109
110    public void setTitle(CharSequence title) {
111        if (title != null) {
112            mTitleView.setText(title);
113
114            if (mTitleView.getVisibility() != VISIBLE) mTitleView.setVisibility(VISIBLE);
115        } else {
116            if (mTitleView.getVisibility() != GONE) mTitleView.setVisibility(GONE);
117        }
118    }
119
120    public MenuItemImpl getItemData() {
121        return mItemData;
122    }
123
124    public void setCheckable(boolean checkable) {
125        if (!checkable && mRadioButton == null && mCheckBox == null) {
126            return;
127        }
128
129        // Depending on whether its exclusive check or not, the checkbox or
130        // radio button will be the one in use (and the other will be otherCompoundButton)
131        final CompoundButton compoundButton;
132        final CompoundButton otherCompoundButton;
133
134        if (mItemData.isExclusiveCheckable()) {
135            if (mRadioButton == null) {
136                insertRadioButton();
137            }
138            compoundButton = mRadioButton;
139            otherCompoundButton = mCheckBox;
140        } else {
141            if (mCheckBox == null) {
142                insertCheckBox();
143            }
144            compoundButton = mCheckBox;
145            otherCompoundButton = mRadioButton;
146        }
147
148        if (checkable) {
149            compoundButton.setChecked(mItemData.isChecked());
150
151            final int newVisibility = checkable ? VISIBLE : GONE;
152            if (compoundButton.getVisibility() != newVisibility) {
153                compoundButton.setVisibility(newVisibility);
154            }
155
156            // Make sure the other compound button isn't visible
157            if (otherCompoundButton != null && otherCompoundButton.getVisibility() != GONE) {
158                otherCompoundButton.setVisibility(GONE);
159            }
160        } else {
161            if (mCheckBox != null) mCheckBox.setVisibility(GONE);
162            if (mRadioButton != null) mRadioButton.setVisibility(GONE);
163        }
164    }
165
166    public void setChecked(boolean checked) {
167        CompoundButton compoundButton;
168
169        if (mItemData.isExclusiveCheckable()) {
170            if (mRadioButton == null) {
171                insertRadioButton();
172            }
173            compoundButton = mRadioButton;
174        } else {
175            if (mCheckBox == null) {
176                insertCheckBox();
177            }
178            compoundButton = mCheckBox;
179        }
180
181        compoundButton.setChecked(checked);
182    }
183
184    public void setShortcut(boolean showShortcut, char shortcutKey) {
185        final int newVisibility = (showShortcut && mItemData.shouldShowShortcut())
186                ? VISIBLE : GONE;
187
188        if (newVisibility == VISIBLE) {
189            mShortcutView.setText(mItemData.getShortcutLabel());
190        }
191
192        if (mShortcutView.getVisibility() != newVisibility) {
193            mShortcutView.setVisibility(newVisibility);
194        }
195    }
196
197    public void setIcon(Drawable icon) {
198        final boolean showIcon = mItemData.shouldShowIcon() || mForceShowIcon;
199        if (!showIcon && !mPreserveIconSpacing) {
200            return;
201        }
202
203        if (mIconView == null && icon == null && !mPreserveIconSpacing) {
204            return;
205        }
206
207        if (mIconView == null) {
208            insertIconView();
209        }
210
211        if (icon != null || mPreserveIconSpacing) {
212            mIconView.setImageDrawable(showIcon ? icon : null);
213
214            if (mIconView.getVisibility() != VISIBLE) {
215                mIconView.setVisibility(VISIBLE);
216            }
217        } else {
218            mIconView.setVisibility(GONE);
219        }
220    }
221
222    @Override
223    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
224        if (mIconView != null && mPreserveIconSpacing) {
225            // Enforce minimum icon spacing
226            ViewGroup.LayoutParams lp = getLayoutParams();
227            LayoutParams iconLp = (LayoutParams) mIconView.getLayoutParams();
228            if (lp.height > 0 && iconLp.width <= 0) {
229                iconLp.width = lp.height;
230            }
231        }
232        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
233    }
234
235    private void insertIconView() {
236        LayoutInflater inflater = getInflater();
237        mIconView = (ImageView) inflater.inflate(com.android.internal.R.layout.list_menu_item_icon,
238                this, false);
239        addView(mIconView, 0);
240    }
241
242    private void insertRadioButton() {
243        LayoutInflater inflater = getInflater();
244        mRadioButton =
245                (RadioButton) inflater.inflate(com.android.internal.R.layout.list_menu_item_radio,
246                this, false);
247        addView(mRadioButton);
248    }
249
250    private void insertCheckBox() {
251        LayoutInflater inflater = getInflater();
252        mCheckBox =
253                (CheckBox) inflater.inflate(com.android.internal.R.layout.list_menu_item_checkbox,
254                this, false);
255        addView(mCheckBox);
256    }
257
258    public boolean prefersCondensedTitle() {
259        return false;
260    }
261
262    public boolean showsIcon() {
263        return mForceShowIcon;
264    }
265
266    private LayoutInflater getInflater() {
267        if (mInflater == null) {
268            mInflater = LayoutInflater.from(mContext);
269        }
270        return mInflater;
271    }
272}
273