ActionBarContextView.java revision a7db03705f53c59e63e63c2e67e2db78f8226dcc 
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.app.ActionBarImpl;
20
21import android.app.ActionBar;
22import android.content.Context;
23import android.content.res.TypedArray;
24import android.graphics.drawable.Drawable;
25import android.util.AttributeSet;
26import android.view.LayoutInflater;
27import android.view.Menu;
28import android.view.MenuItem;
29import android.view.View;
30import android.view.ViewGroup;
31import android.view.View.MeasureSpec;
32import android.view.ViewGroup.LayoutParams;
33import android.widget.ImageButton;
34import android.widget.LinearLayout;
35import android.widget.TextView;
36
37/**
38 * @hide
39 */
40public class ActionBarContextView extends ViewGroup {
41    // TODO: This must be defined in the default theme
42    private static final int CONTENT_HEIGHT_DIP = 50;
43
44    private int mItemPadding;
45    private int mItemMargin;
46    private int mContentHeight;
47
48    private CharSequence mTitle;
49    private CharSequence mSubtitle;
50
51    private ImageButton mCloseButton;
52    private View mCustomView;
53    private LinearLayout mTitleLayout;
54    private TextView mTitleView;
55    private TextView mSubtitleView;
56    private Drawable mCloseDrawable;
57
58    public ActionBarContextView(Context context) {
59        this(context, null, 0);
60    }
61
62    public ActionBarContextView(Context context, AttributeSet attrs) {
63        this(context, attrs, 0);
64    }
65
66    public ActionBarContextView(Context context, AttributeSet attrs, int defStyle) {
67        super(context, attrs, defStyle);
68
69        TypedArray a = context.obtainStyledAttributes(attrs,
70                com.android.internal.R.styleable.Theme);
71        mItemPadding = a.getDimensionPixelOffset(
72                com.android.internal.R.styleable.Theme_actionButtonPadding, 0);
73        setBackgroundDrawable(a.getDrawable(
74                com.android.internal.R.styleable.Theme_actionBarContextBackground));
75        mCloseDrawable = a.getDrawable(
76                com.android.internal.R.styleable.Theme_actionBarCloseContextDrawable);
77        mItemMargin = mItemPadding / 2;
78
79        mContentHeight = CONTENT_HEIGHT_DIP;
80        a.recycle();
81    }
82
83    public void setCustomView(View view) {
84        if (mCustomView != null) {
85            removeView(mCustomView);
86        }
87        mCustomView = view;
88        if (mTitleLayout != null) {
89            removeView(mTitleLayout);
90            mTitleLayout = null;
91        }
92        if (view != null) {
93            addView(view);
94        }
95        requestLayout();
96    }
97
98    public void setTitle(CharSequence title) {
99        mTitle = title;
100        initTitle();
101    }
102
103    public void setSubtitle(CharSequence subtitle) {
104        mSubtitle = subtitle;
105        initTitle();
106    }
107
108    private void initTitle() {
109        if (mTitleLayout == null) {
110            LayoutInflater inflater = LayoutInflater.from(getContext());
111            mTitleLayout = (LinearLayout) inflater.inflate(R.layout.action_bar_title_item, null);
112            mTitleView = (TextView) mTitleLayout.findViewById(R.id.action_bar_title);
113            mSubtitleView = (TextView) mTitleLayout.findViewById(R.id.action_bar_subtitle);
114            if (mTitle != null) {
115                mTitleView.setText(mTitle);
116            }
117            if (mSubtitle != null) {
118                mSubtitleView.setText(mSubtitle);
119            }
120            addView(mTitleLayout);
121        } else {
122            mTitleView.setText(mTitle);
123            mSubtitleView.setText(mSubtitle);
124            if (mTitleLayout.getParent() == null) {
125                addView(mTitleLayout);
126            }
127        }
128    }
129
130    public void initForMode(final ActionBar.ContextMode mode) {
131        final ActionBarImpl.ContextMode implMode = (ActionBarImpl.ContextMode) mode;
132
133        if (mCloseButton == null) {
134            mCloseButton = new ImageButton(getContext());
135            mCloseButton.setImageDrawable(mCloseDrawable);
136            mCloseButton.setBackgroundDrawable(null);
137            mCloseButton.setOnClickListener(new OnClickListener() {
138                public void onClick(View v) {
139                    mode.finish();
140                }
141            });
142        }
143        addView(mCloseButton);
144
145        final Context context = getContext();
146        final Menu menu = mode.getMenu();
147        final int itemCount = menu.size();
148        for (int i = 0; i < itemCount; i++) {
149            final MenuItem item = menu.getItem(i);
150            final ImageButton button = new ImageButton(context, null,
151                    com.android.internal.R.attr.actionButtonStyle);
152            button.setClickable(true);
153            button.setFocusable(true);
154            button.setImageDrawable(item.getIcon());
155            button.setId(item.getItemId());
156            button.setVisibility(item.isVisible() ? VISIBLE : GONE);
157            button.setEnabled(item.isEnabled());
158
159            button.setOnClickListener(new OnClickListener() {
160                public void onClick(View v) {
161                    implMode.dispatchOnContextItemClicked(item);
162                }
163            });
164
165            addView(button);
166        }
167        requestLayout();
168    }
169
170    public void closeMode() {
171        removeAllViews();
172        mCustomView = null;
173    }
174
175    @Override
176    protected LayoutParams generateDefaultLayoutParams() {
177        // Used by custom views if they don't supply layout params. Everything else
178        // added to an ActionBarContextView should have them already.
179        return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
180    }
181
182    @Override
183    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
184        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
185        if (widthMode != MeasureSpec.EXACTLY) {
186            throw new IllegalStateException(getClass().getSimpleName() + " can only be used " +
187                    "with android:layout_width=\"match_parent\" (or fill_parent)");
188        }
189
190        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
191        if (heightMode != MeasureSpec.AT_MOST) {
192            throw new IllegalStateException(getClass().getSimpleName() + " can only be used " +
193                    "with android:layout_height=\"wrap_content\"");
194        }
195
196        final int contentWidth = MeasureSpec.getSize(widthMeasureSpec);
197        final int itemMargin = mItemPadding;
198
199        int availableWidth = contentWidth - getPaddingLeft() - getPaddingRight();
200        final int height = mContentHeight - getPaddingTop() - getPaddingBottom();
201        final int childSpecHeight = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
202
203        if (mCloseButton != null) {
204            availableWidth = measureChildView(mCloseButton, availableWidth,
205                    childSpecHeight, itemMargin);
206        }
207
208        if (mTitleLayout != null && mCustomView == null) {
209            availableWidth = measureChildView(mTitleLayout, availableWidth,
210                    childSpecHeight, itemMargin);
211        }
212
213        final int childCount = getChildCount();
214        for (int i = 0; i < childCount; i++) {
215            final View child = getChildAt(i);
216            if (child == mCloseButton || child == mTitleLayout || child == mCustomView) {
217                continue;
218            }
219
220            availableWidth = measureChildView(child, availableWidth, childSpecHeight, itemMargin);
221        }
222
223        if (mCustomView != null) {
224            LayoutParams lp = mCustomView.getLayoutParams();
225            final int customWidthMode = lp.width != LayoutParams.WRAP_CONTENT ?
226                    MeasureSpec.EXACTLY : MeasureSpec.AT_MOST;
227            final int customWidth = lp.width >= 0 ?
228                    Math.min(lp.width, availableWidth) : availableWidth;
229            final int customHeightMode = lp.height != LayoutParams.WRAP_CONTENT ?
230                    MeasureSpec.EXACTLY : MeasureSpec.AT_MOST;
231            final int customHeight = lp.height >= 0 ?
232                    Math.min(lp.height, height) : height;
233            mCustomView.measure(MeasureSpec.makeMeasureSpec(customWidth, customWidthMode),
234                    MeasureSpec.makeMeasureSpec(customHeight, customHeightMode));
235        }
236
237        setMeasuredDimension(contentWidth, mContentHeight);
238    }
239
240    @Override
241    protected void onLayout(boolean changed, int l, int t, int r, int b) {
242        int x = getPaddingLeft();
243        final int y = getPaddingTop();
244        final int contentHeight = b - t - getPaddingTop() - getPaddingBottom();
245        final int itemMargin = mItemPadding;
246
247        if (mCloseButton != null && mCloseButton.getVisibility() != GONE) {
248            x += positionChild(mCloseButton, x, y, contentHeight);
249        }
250
251        if (mTitleLayout != null && mCustomView == null) {
252            x += positionChild(mTitleLayout, x, y, contentHeight) + itemMargin;
253        }
254
255        if (mCustomView != null) {
256            x += positionChild(mCustomView, x, y, contentHeight) + itemMargin;
257        }
258
259        x = r - l - getPaddingRight();
260
261        final int childCount = getChildCount();
262        for (int i = 0; i < childCount; i++) {
263            final View child = getChildAt(i);
264            if (child == mCloseButton || child == mTitleLayout || child == mCustomView) {
265                continue;
266            }
267
268            x -= positionChildInverse(child, x, y, contentHeight) + itemMargin;
269        }
270    }
271
272    private int measureChildView(View child, int availableWidth, int childSpecHeight, int spacing) {
273        child.measure(MeasureSpec.makeMeasureSpec(availableWidth, MeasureSpec.AT_MOST),
274                childSpecHeight);
275
276        availableWidth -= child.getMeasuredWidth();
277        availableWidth -= spacing;
278
279        return availableWidth;
280    }
281
282    private int positionChild(View child, int x, int y, int contentHeight) {
283        int childWidth = child.getMeasuredWidth();
284        int childHeight = child.getMeasuredHeight();
285        int childTop = y + (contentHeight - childHeight) / 2;
286
287        child.layout(x, childTop, x + childWidth, childTop + childHeight);
288
289        return childWidth;
290    }
291
292    private int positionChildInverse(View child, int x, int y, int contentHeight) {
293        int childWidth = child.getMeasuredWidth();
294        int childHeight = child.getMeasuredHeight();
295        int childTop = y + (contentHeight - childHeight) / 2;
296
297        child.layout(x - childWidth, childTop, x, childTop + childHeight);
298
299        return childWidth;
300    }
301}
302