ListMenuItemView.java revision 617feb99a06e7ffb3894e86a286bf30e085f321a 
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.view.accessibility.AccessibilityNodeInfo;
27import android.widget.CheckBox;
28import android.widget.CompoundButton;
29import android.widget.ImageView;
30import android.widget.LinearLayout;
31import android.widget.RadioButton;
32import android.widget.TextView;
33
34/**
35 * The item view for each item in the ListView-based MenuViews.
36 */
37public class ListMenuItemView extends LinearLayout implements MenuView.ItemView {
38    private static final String TAG = "ListMenuItemView";
39    private MenuItemImpl mItemData;
40
41    private ImageView mIconView;
42    private RadioButton mRadioButton;
43    private TextView mTitleView;
44    private CheckBox mCheckBox;
45    private TextView mShortcutView;
46
47    private Drawable mBackground;
48    private int mTextAppearance;
49    private Context mTextAppearanceContext;
50    private boolean mPreserveIconSpacing;
51
52    private int mMenuType;
53
54    private LayoutInflater mInflater;
55
56    private boolean mForceShowIcon;
57
58    public ListMenuItemView(
59            Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
60        super(context, attrs, defStyleAttr, defStyleRes);
61
62        final TypedArray a = context.obtainStyledAttributes(
63                attrs, com.android.internal.R.styleable.MenuView, defStyleAttr, defStyleRes);
64
65        mBackground = a.getDrawable(com.android.internal.R.styleable.MenuView_itemBackground);
66        mTextAppearance = a.getResourceId(com.android.internal.R.styleable.
67                                          MenuView_itemTextAppearance, -1);
68        mPreserveIconSpacing = a.getBoolean(
69                com.android.internal.R.styleable.MenuView_preserveIconSpacing, false);
70        mTextAppearanceContext = context;
71
72        a.recycle();
73    }
74
75    public ListMenuItemView(Context context, AttributeSet attrs, int defStyleAttr) {
76        this(context, attrs, defStyleAttr, 0);
77    }
78
79    public ListMenuItemView(Context context, AttributeSet attrs) {
80        this(context, attrs, 0);
81    }
82
83    @Override
84    protected void onFinishInflate() {
85        super.onFinishInflate();
86
87        setBackgroundDrawable(mBackground);
88
89        mTitleView = (TextView) findViewById(com.android.internal.R.id.title);
90        if (mTextAppearance != -1) {
91            mTitleView.setTextAppearance(mTextAppearanceContext,
92                                         mTextAppearance);
93        }
94
95        mShortcutView = (TextView) findViewById(com.android.internal.R.id.shortcut);
96    }
97
98    public void initialize(MenuItemImpl itemData, int menuType) {
99        mItemData = itemData;
100        mMenuType = menuType;
101
102        setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE);
103
104        setTitle(itemData.getTitleForItemView(this));
105        setCheckable(itemData.isCheckable());
106        setShortcut(itemData.shouldShowShortcut(), itemData.getShortcut());
107        setIcon(itemData.getIcon());
108        setEnabled(itemData.isEnabled());
109    }
110
111    public void setForceShowIcon(boolean forceShow) {
112        mPreserveIconSpacing = mForceShowIcon = forceShow;
113    }
114
115    public void setTitle(CharSequence title) {
116        if (title != null) {
117            mTitleView.setText(title);
118
119            if (mTitleView.getVisibility() != VISIBLE) mTitleView.setVisibility(VISIBLE);
120        } else {
121            if (mTitleView.getVisibility() != GONE) mTitleView.setVisibility(GONE);
122        }
123    }
124
125    public MenuItemImpl getItemData() {
126        return mItemData;
127    }
128
129    public void setCheckable(boolean checkable) {
130        if (!checkable && mRadioButton == null && mCheckBox == null) {
131            return;
132        }
133
134        // Depending on whether its exclusive check or not, the checkbox or
135        // radio button will be the one in use (and the other will be otherCompoundButton)
136        final CompoundButton compoundButton;
137        final CompoundButton otherCompoundButton;
138
139        if (mItemData.isExclusiveCheckable()) {
140            if (mRadioButton == null) {
141                insertRadioButton();
142            }
143            compoundButton = mRadioButton;
144            otherCompoundButton = mCheckBox;
145        } else {
146            if (mCheckBox == null) {
147                insertCheckBox();
148            }
149            compoundButton = mCheckBox;
150            otherCompoundButton = mRadioButton;
151        }
152
153        if (checkable) {
154            compoundButton.setChecked(mItemData.isChecked());
155
156            final int newVisibility = checkable ? VISIBLE : GONE;
157            if (compoundButton.getVisibility() != newVisibility) {
158                compoundButton.setVisibility(newVisibility);
159            }
160
161            // Make sure the other compound button isn't visible
162            if (otherCompoundButton != null && otherCompoundButton.getVisibility() != GONE) {
163                otherCompoundButton.setVisibility(GONE);
164            }
165        } else {
166            if (mCheckBox != null) mCheckBox.setVisibility(GONE);
167            if (mRadioButton != null) mRadioButton.setVisibility(GONE);
168        }
169    }
170
171    public void setChecked(boolean checked) {
172        CompoundButton compoundButton;
173
174        if (mItemData.isExclusiveCheckable()) {
175            if (mRadioButton == null) {
176                insertRadioButton();
177            }
178            compoundButton = mRadioButton;
179        } else {
180            if (mCheckBox == null) {
181                insertCheckBox();
182            }
183            compoundButton = mCheckBox;
184        }
185
186        compoundButton.setChecked(checked);
187    }
188
189    public void setShortcut(boolean showShortcut, char shortcutKey) {
190        final int newVisibility = (showShortcut && mItemData.shouldShowShortcut())
191                ? VISIBLE : GONE;
192
193        if (newVisibility == VISIBLE) {
194            mShortcutView.setText(mItemData.getShortcutLabel());
195        }
196
197        if (mShortcutView.getVisibility() != newVisibility) {
198            mShortcutView.setVisibility(newVisibility);
199        }
200    }
201
202    public void setIcon(Drawable icon) {
203        final boolean showIcon = mItemData.shouldShowIcon() || mForceShowIcon;
204        if (!showIcon && !mPreserveIconSpacing) {
205            return;
206        }
207
208        if (mIconView == null && icon == null && !mPreserveIconSpacing) {
209            return;
210        }
211
212        if (mIconView == null) {
213            insertIconView();
214        }
215
216        if (icon != null || mPreserveIconSpacing) {
217            mIconView.setImageDrawable(showIcon ? icon : null);
218
219            if (mIconView.getVisibility() != VISIBLE) {
220                mIconView.setVisibility(VISIBLE);
221            }
222        } else {
223            mIconView.setVisibility(GONE);
224        }
225    }
226
227    @Override
228    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
229        if (mIconView != null && mPreserveIconSpacing) {
230            // Enforce minimum icon spacing
231            ViewGroup.LayoutParams lp = getLayoutParams();
232            LayoutParams iconLp = (LayoutParams) mIconView.getLayoutParams();
233            if (lp.height > 0 && iconLp.width <= 0) {
234                iconLp.width = lp.height;
235            }
236        }
237        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
238    }
239
240    private void insertIconView() {
241        LayoutInflater inflater = getInflater();
242        mIconView = (ImageView) inflater.inflate(com.android.internal.R.layout.list_menu_item_icon,
243                this, false);
244        addView(mIconView, 0);
245    }
246
247    private void insertRadioButton() {
248        LayoutInflater inflater = getInflater();
249        mRadioButton =
250                (RadioButton) inflater.inflate(com.android.internal.R.layout.list_menu_item_radio,
251                this, false);
252        addView(mRadioButton);
253    }
254
255    private void insertCheckBox() {
256        LayoutInflater inflater = getInflater();
257        mCheckBox =
258                (CheckBox) inflater.inflate(com.android.internal.R.layout.list_menu_item_checkbox,
259                this, false);
260        addView(mCheckBox);
261    }
262
263    public boolean prefersCondensedTitle() {
264        return false;
265    }
266
267    public boolean showsIcon() {
268        return mForceShowIcon;
269    }
270
271    private LayoutInflater getInflater() {
272        if (mInflater == null) {
273            mInflater = LayoutInflater.from(mContext);
274        }
275        return mInflater;
276    }
277
278    @Override
279    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
280        super.onInitializeAccessibilityNodeInfo(info);
281
282        if (mItemData != null && mItemData.hasSubMenu()) {
283            info.setCanOpenPopup(true);
284        }
285    }
286}
287