ActionBarContextView.java revision 85446e95afa480cee2247bb96795fccc8cf812af 
1/*
2 * Copyright (C) 2010 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 */
16package com.android.internal.widget;
17
18import com.android.internal.R;
19import com.android.internal.view.menu.ActionMenuView;
20import com.android.internal.view.menu.MenuBuilder;
21
22import android.content.Context;
23import android.content.res.TypedArray;
24import android.util.AttributeSet;
25import android.view.ActionMode;
26import android.view.LayoutInflater;
27import android.view.View;
28import android.view.ViewGroup;
29import android.widget.Button;
30import android.widget.ButtonGroup;
31import android.widget.ImageButton;
32import android.widget.LinearLayout;
33import android.widget.TextView;
34
35/**
36 * @hide
37 */
38public class ActionBarContextView extends ViewGroup {
39    private int mContentHeight;
40
41    private CharSequence mTitle;
42    private CharSequence mSubtitle;
43
44    private View mClose;
45    private View mCustomView;
46    private LinearLayout mTitleLayout;
47    private TextView mTitleView;
48    private TextView mSubtitleView;
49    private int mTitleStyleRes;
50    private int mSubtitleStyleRes;
51    private ActionMenuView mMenuView;
52
53    public ActionBarContextView(Context context) {
54        this(context, null);
55    }
56
57    public ActionBarContextView(Context context, AttributeSet attrs) {
58        this(context, attrs, com.android.internal.R.attr.actionModeStyle);
59    }
60
61    public ActionBarContextView(Context context, AttributeSet attrs, int defStyle) {
62        super(context, attrs, defStyle);
63
64        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ActionMode, defStyle, 0);
65        setBackgroundDrawable(a.getDrawable(
66                com.android.internal.R.styleable.ActionMode_background));
67        mTitleStyleRes = a.getResourceId(
68                com.android.internal.R.styleable.ActionMode_titleTextStyle, 0);
69        mSubtitleStyleRes = a.getResourceId(
70                com.android.internal.R.styleable.ActionMode_subtitleTextStyle, 0);
71
72        mContentHeight = a.getLayoutDimension(
73                com.android.internal.R.styleable.ActionMode_height, 0);
74        a.recycle();
75    }
76
77    @Override
78    public ActionMode startActionModeForChild(View child, ActionMode.Callback callback) {
79        // No starting an action mode for an existing action mode UI child! (Where would it go?)
80        return null;
81    }
82
83    public void setHeight(int height) {
84        mContentHeight = height;
85    }
86
87    public void setCustomView(View view) {
88        if (mCustomView != null) {
89            removeView(mCustomView);
90        }
91        mCustomView = view;
92        if (mTitleLayout != null) {
93            removeView(mTitleLayout);
94            mTitleLayout = null;
95        }
96        if (view != null) {
97            addView(view);
98        }
99        requestLayout();
100    }
101
102    public void setTitle(CharSequence title) {
103        mTitle = title;
104        initTitle();
105    }
106
107    public void setSubtitle(CharSequence subtitle) {
108        mSubtitle = subtitle;
109        initTitle();
110    }
111
112    public CharSequence getTitle() {
113        return mTitle;
114    }
115
116    public CharSequence getSubtitle() {
117        return mSubtitle;
118    }
119
120    private void initTitle() {
121        if (mTitleLayout == null) {
122            LayoutInflater inflater = LayoutInflater.from(getContext());
123            inflater.inflate(R.layout.action_bar_title_item, this);
124            mTitleLayout = (LinearLayout) getChildAt(getChildCount() - 1);
125            mTitleView = (TextView) mTitleLayout.findViewById(R.id.action_bar_title);
126            mSubtitleView = (TextView) mTitleLayout.findViewById(R.id.action_bar_subtitle);
127            if (mTitle != null) {
128                mTitleView.setText(mTitle);
129                if (mTitleStyleRes != 0) {
130                    mTitleView.setTextAppearance(mContext, mTitleStyleRes);
131                }
132            }
133            if (mSubtitle != null) {
134                mSubtitleView.setText(mSubtitle);
135                if (mSubtitleStyleRes != 0) {
136                    mSubtitleView.setTextAppearance(mContext, mSubtitleStyleRes);
137                }
138                mSubtitleView.setVisibility(VISIBLE);
139            }
140        } else {
141            mTitleView.setText(mTitle);
142            mSubtitleView.setText(mSubtitle);
143            mSubtitleView.setVisibility(mSubtitle != null ? VISIBLE : GONE);
144            if (mTitleLayout.getParent() == null) {
145                addView(mTitleLayout);
146            }
147        }
148    }
149
150    public void initForMode(final ActionMode mode) {
151        if (mClose == null) {
152            LayoutInflater inflater = LayoutInflater.from(mContext);
153            inflater.inflate(R.layout.action_mode_close_item, this);
154            mClose = getChildAt(getChildCount() - 1);
155        } else {
156            addView(mClose);
157        }
158
159        View closeButton = mClose.findViewById(R.id.action_mode_close_button);
160        closeButton.setOnClickListener(new OnClickListener() {
161            public void onClick(View v) {
162                mode.finish();
163            }
164        });
165
166        final MenuBuilder menu = (MenuBuilder) mode.getMenu();
167        mMenuView = (ActionMenuView) menu.getMenuView(MenuBuilder.TYPE_ACTION_BUTTON, this);
168        mMenuView.setOverflowReserved(true);
169        mMenuView.updateChildren(false);
170        addView(mMenuView);
171    }
172
173    public void closeMode() {
174        removeAllViews();
175        mCustomView = null;
176        mMenuView = null;
177    }
178
179    public boolean showOverflowMenu() {
180        if (mMenuView != null) {
181            return mMenuView.showOverflowMenu();
182        }
183        return false;
184    }
185
186    public boolean hideOverflowMenu() {
187        if (mMenuView != null) {
188            return mMenuView.hideOverflowMenu();
189        }
190        return false;
191    }
192
193    public boolean isOverflowMenuShowing() {
194        if (mMenuView != null) {
195            return mMenuView.isOverflowMenuShowing();
196        }
197        return false;
198    }
199
200    @Override
201    protected LayoutParams generateDefaultLayoutParams() {
202        // Used by custom views if they don't supply layout params. Everything else
203        // added to an ActionBarContextView should have them already.
204        return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
205    }
206
207    @Override
208    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
209        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
210        if (widthMode != MeasureSpec.EXACTLY) {
211            throw new IllegalStateException(getClass().getSimpleName() + " can only be used " +
212                    "with android:layout_width=\"match_parent\" (or fill_parent)");
213        }
214
215        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
216        if (heightMode == MeasureSpec.UNSPECIFIED) {
217            throw new IllegalStateException(getClass().getSimpleName() + " can only be used " +
218                    "with android:layout_height=\"wrap_content\"");
219        }
220
221        final int contentWidth = MeasureSpec.getSize(widthMeasureSpec);
222
223        int maxHeight = mContentHeight > 0 ?
224                mContentHeight : MeasureSpec.getSize(heightMeasureSpec);
225
226        final int verticalPadding = getPaddingTop() + getPaddingBottom();
227        int availableWidth = contentWidth - getPaddingLeft() - getPaddingRight();
228        final int height = maxHeight - verticalPadding;
229        final int childSpecHeight = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
230
231        if (mClose != null) {
232            availableWidth = measureChildView(mClose, availableWidth, childSpecHeight, 0);
233        }
234
235        if (mTitleLayout != null && mCustomView == null) {
236            availableWidth = measureChildView(mTitleLayout, availableWidth, childSpecHeight, 0);
237        }
238
239        final int childCount = getChildCount();
240        for (int i = 0; i < childCount; i++) {
241            final View child = getChildAt(i);
242            if (child == mClose || child == mTitleLayout || child == mCustomView) {
243                continue;
244            }
245
246            availableWidth = measureChildView(child, availableWidth, childSpecHeight, 0);
247        }
248
249        if (mCustomView != null) {
250            LayoutParams lp = mCustomView.getLayoutParams();
251            final int customWidthMode = lp.width != LayoutParams.WRAP_CONTENT ?
252                    MeasureSpec.EXACTLY : MeasureSpec.AT_MOST;
253            final int customWidth = lp.width >= 0 ?
254                    Math.min(lp.width, availableWidth) : availableWidth;
255            final int customHeightMode = lp.height != LayoutParams.WRAP_CONTENT ?
256                    MeasureSpec.EXACTLY : MeasureSpec.AT_MOST;
257            final int customHeight = lp.height >= 0 ?
258                    Math.min(lp.height, height) : height;
259            mCustomView.measure(MeasureSpec.makeMeasureSpec(customWidth, customWidthMode),
260                    MeasureSpec.makeMeasureSpec(customHeight, customHeightMode));
261        }
262
263        if (mContentHeight <= 0) {
264            int measuredHeight = 0;
265            final int count = getChildCount();
266            for (int i = 0; i < count; i++) {
267                View v = getChildAt(i);
268                int paddedViewHeight = v.getMeasuredHeight() + verticalPadding;
269                if (paddedViewHeight > measuredHeight) {
270                    measuredHeight = paddedViewHeight;
271                }
272            }
273            setMeasuredDimension(contentWidth, measuredHeight);
274        } else {
275            setMeasuredDimension(contentWidth, maxHeight);
276        }
277    }
278
279    @Override
280    protected void onLayout(boolean changed, int l, int t, int r, int b) {
281        int x = getPaddingLeft();
282        final int y = getPaddingTop();
283        final int contentHeight = b - t - getPaddingTop() - getPaddingBottom();
284
285        if (mClose != null && mClose.getVisibility() != GONE) {
286            x += positionChild(mClose, x, y, contentHeight);
287        }
288
289        if (mTitleLayout != null && mCustomView == null) {
290            x += positionChild(mTitleLayout, x, y, contentHeight);
291        }
292
293        if (mCustomView != null) {
294            x += positionChild(mCustomView, x, y, contentHeight);
295        }
296
297        x = r - l - getPaddingRight();
298
299        if (mMenuView != null) {
300            x -= positionChildInverse(mMenuView, x, y, contentHeight);
301        }
302    }
303
304    private int measureChildView(View child, int availableWidth, int childSpecHeight, int spacing) {
305        child.measure(MeasureSpec.makeMeasureSpec(availableWidth, MeasureSpec.AT_MOST),
306                childSpecHeight);
307
308        availableWidth -= child.getMeasuredWidth();
309        availableWidth -= spacing;
310
311        return availableWidth;
312    }
313
314    private int positionChild(View child, int x, int y, int contentHeight) {
315        int childWidth = child.getMeasuredWidth();
316        int childHeight = child.getMeasuredHeight();
317        int childTop = y + (contentHeight - childHeight) / 2;
318
319        child.layout(x, childTop, x + childWidth, childTop + childHeight);
320
321        return childWidth;
322    }
323
324    private int positionChildInverse(View child, int x, int y, int contentHeight) {
325        int childWidth = child.getMeasuredWidth();
326        int childHeight = child.getMeasuredHeight();
327        int childTop = y + (contentHeight - childHeight) / 2;
328
329        child.layout(x - childWidth, childTop, x, childTop + childHeight);
330
331        return childWidth;
332    }
333}
334