ListMenuItemView.java revision 89208232f3b5d1451408d787872504a190bc7ee0 
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 android.support.v7.internal.view.menu;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.drawable.Drawable;
22import android.support.v7.appcompat.R;
23import android.util.AttributeSet;
24import android.view.LayoutInflater;
25import android.view.View;
26import android.view.ViewGroup;
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 *
37 * @hide
38 */
39public class ListMenuItemView extends LinearLayout implements MenuView.ItemView {
40
41    private static final String TAG = "ListMenuItemView";
42    private MenuItemImpl mItemData;
43
44    private ImageView mIconView;
45    private RadioButton mRadioButton;
46    private TextView mTitleView;
47    private CheckBox mCheckBox;
48    private TextView mShortcutView;
49
50    private Drawable mBackground;
51    private int mTextAppearance;
52    private Context mTextAppearanceContext;
53    private boolean mPreserveIconSpacing;
54
55    private int mMenuType;
56
57    private Context mContext;
58    private LayoutInflater mInflater;
59
60    private boolean mForceShowIcon;
61
62    public ListMenuItemView(Context context, AttributeSet attrs, int defStyle) {
63        super(context, attrs);
64        mContext = context;
65
66        TypedArray a =
67                context.obtainStyledAttributes(
68                        attrs, R.styleable.MenuView, defStyle, 0);
69
70        mBackground = a.getDrawable(R.styleable.MenuView_android_itemBackground);
71        mTextAppearance = a.getResourceId(R.styleable.
72                MenuView_android_itemTextAppearance, -1);
73        mPreserveIconSpacing = a.getBoolean(
74                R.styleable.MenuView_android_preserveIconSpacing, false);
75        mTextAppearanceContext = context;
76
77        a.recycle();
78    }
79
80    public ListMenuItemView(Context context, AttributeSet attrs) {
81        this(context, attrs, 0);
82    }
83
84    @Override
85    protected void onFinishInflate() {
86        super.onFinishInflate();
87
88        setBackgroundDrawable(mBackground);
89
90        mTitleView = (TextView) findViewById(R.id.title);
91        if (mTextAppearance != -1) {
92            mTitleView.setTextAppearance(mTextAppearanceContext,
93                    mTextAppearance);
94        }
95
96        mShortcutView = (TextView) findViewById(R.id.shortcut);
97    }
98
99    public void initialize(MenuItemImpl itemData, int menuType) {
100        mItemData = itemData;
101        mMenuType = menuType;
102
103        setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE);
104
105        setTitle(itemData.getTitleForItemView(this));
106        setCheckable(itemData.isCheckable());
107        setShortcut(itemData.shouldShowShortcut(), itemData.getShortcut());
108        setIcon(itemData.getIcon());
109        setEnabled(itemData.isEnabled());
110    }
111
112    public void setForceShowIcon(boolean forceShow) {
113        mPreserveIconSpacing = mForceShowIcon = forceShow;
114    }
115
116    public void setTitle(CharSequence title) {
117        if (title != null) {
118            mTitleView.setText(title);
119
120            if (mTitleView.getVisibility() != VISIBLE) {
121                mTitleView.setVisibility(VISIBLE);
122            }
123        } else {
124            if (mTitleView.getVisibility() != GONE) {
125                mTitleView.setVisibility(GONE);
126            }
127        }
128    }
129
130    public MenuItemImpl getItemData() {
131        return mItemData;
132    }
133
134    public void setCheckable(boolean checkable) {
135        if (!checkable && mRadioButton == null && mCheckBox == null) {
136            return;
137        }
138
139        // Depending on whether its exclusive check or not, the checkbox or
140        // radio button will be the one in use (and the other will be otherCompoundButton)
141        final CompoundButton compoundButton;
142        final CompoundButton otherCompoundButton;
143
144        if (mItemData.isExclusiveCheckable()) {
145            if (mRadioButton == null) {
146                insertRadioButton();
147            }
148            compoundButton = mRadioButton;
149            otherCompoundButton = mCheckBox;
150        } else {
151            if (mCheckBox == null) {
152                insertCheckBox();
153            }
154            compoundButton = mCheckBox;
155            otherCompoundButton = mRadioButton;
156        }
157
158        if (checkable) {
159            compoundButton.setChecked(mItemData.isChecked());
160
161            final int newVisibility = checkable ? VISIBLE : GONE;
162            if (compoundButton.getVisibility() != newVisibility) {
163                compoundButton.setVisibility(newVisibility);
164            }
165
166            // Make sure the other compound button isn't visible
167            if (otherCompoundButton != null && otherCompoundButton.getVisibility() != GONE) {
168                otherCompoundButton.setVisibility(GONE);
169            }
170        } else {
171            if (mCheckBox != null) {
172                mCheckBox.setVisibility(GONE);
173            }
174            if (mRadioButton != null) {
175                mRadioButton.setVisibility(GONE);
176            }
177        }
178    }
179
180    public void setChecked(boolean checked) {
181        CompoundButton compoundButton;
182
183        if (mItemData.isExclusiveCheckable()) {
184            if (mRadioButton == null) {
185                insertRadioButton();
186            }
187            compoundButton = mRadioButton;
188        } else {
189            if (mCheckBox == null) {
190                insertCheckBox();
191            }
192            compoundButton = mCheckBox;
193        }
194
195        compoundButton.setChecked(checked);
196    }
197
198    public void setShortcut(boolean showShortcut, char shortcutKey) {
199        final int newVisibility = (showShortcut && mItemData.shouldShowShortcut())
200                ? VISIBLE : GONE;
201
202        if (newVisibility == VISIBLE) {
203            mShortcutView.setText(mItemData.getShortcutLabel());
204        }
205
206        if (mShortcutView.getVisibility() != newVisibility) {
207            mShortcutView.setVisibility(newVisibility);
208        }
209    }
210
211    public void setIcon(Drawable icon) {
212        final boolean showIcon = mItemData.shouldShowIcon() || mForceShowIcon;
213        if (!showIcon && !mPreserveIconSpacing) {
214            return;
215        }
216
217        if (mIconView == null && icon == null && !mPreserveIconSpacing) {
218            return;
219        }
220
221        if (mIconView == null) {
222            insertIconView();
223        }
224
225        if (icon != null || mPreserveIconSpacing) {
226            mIconView.setImageDrawable(showIcon ? icon : null);
227
228            if (mIconView.getVisibility() != VISIBLE) {
229                mIconView.setVisibility(VISIBLE);
230            }
231        } else {
232            mIconView.setVisibility(GONE);
233        }
234    }
235
236    @Override
237    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
238        if (mIconView != null && mPreserveIconSpacing) {
239            // Enforce minimum icon spacing
240            ViewGroup.LayoutParams lp = getLayoutParams();
241            LayoutParams iconLp = (LayoutParams) mIconView.getLayoutParams();
242            if (lp.height > 0 && iconLp.width <= 0) {
243                iconLp.width = lp.height;
244            }
245        }
246        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
247    }
248
249    private void insertIconView() {
250        LayoutInflater inflater = getInflater();
251        mIconView = (ImageView) inflater.inflate(R.layout.abc_list_menu_item_icon,
252                this, false);
253        addView(mIconView, 0);
254    }
255
256    private void insertRadioButton() {
257        LayoutInflater inflater = getInflater();
258        mRadioButton =
259                (RadioButton) inflater.inflate(R.layout.abc_list_menu_item_radio,
260                        this, false);
261        addView(mRadioButton);
262    }
263
264    private void insertCheckBox() {
265        LayoutInflater inflater = getInflater();
266        mCheckBox =
267                (CheckBox) inflater.inflate(R.layout.abc_list_menu_item_checkbox,
268                        this, false);
269        addView(mCheckBox);
270    }
271
272    public boolean prefersCondensedTitle() {
273        return false;
274    }
275
276    public boolean showsIcon() {
277        return mForceShowIcon;
278    }
279
280    private LayoutInflater getInflater() {
281        if (mInflater == null) {
282            mInflater = LayoutInflater.from(mContext);
283        }
284        return mInflater;
285    }
286}
287
288