ActionBarContextView.java revision 6e34636749217654f43221885afb7a29bb5ca96a 
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.graphics.drawable.Drawable;
25import android.util.AttributeSet;
26import android.view.ActionMode;
27import android.view.LayoutInflater;
28import android.view.View;
29import android.view.ViewGroup;
30import android.widget.ImageButton;
31import android.widget.LinearLayout;
32import android.widget.TextView;
33
34/**
35 * @hide
36 */
37public class ActionBarContextView extends ViewGroup {
38    // TODO: This must be defined in the default theme
39    private static final int CONTENT_HEIGHT_DIP = 50;
40
41    private int mItemPadding;
42    private int mItemMargin;
43    private int mActionSpacing;
44    private int mContentHeight;
45
46    private CharSequence mTitle;
47    private CharSequence mSubtitle;
48
49    private ImageButton mCloseButton;
50    private View mCustomView;
51    private LinearLayout mTitleLayout;
52    private TextView mTitleView;
53    private TextView mSubtitleView;
54    private Drawable mCloseDrawable;
55    private ActionMenuView mMenuView;
56
57    public ActionBarContextView(Context context) {
58        this(context, null, 0);
59    }
60
61    public ActionBarContextView(Context context, AttributeSet attrs) {
62        this(context, attrs, 0);
63    }
64
65    public ActionBarContextView(Context context, AttributeSet attrs, int defStyle) {
66        super(context, attrs, defStyle);
67
68        TypedArray a = context.obtainStyledAttributes(attrs,
69                com.android.internal.R.styleable.Theme);
70        mItemPadding = a.getDimensionPixelOffset(
71                com.android.internal.R.styleable.Theme_actionButtonPadding, 0);
72        setBackgroundDrawable(a.getDrawable(
73                com.android.internal.R.styleable.Theme_actionBarContextBackground));
74        mCloseDrawable = a.getDrawable(
75                com.android.internal.R.styleable.Theme_actionBarCloseContextDrawable);
76        mItemMargin = mItemPadding / 2;
77
78        mContentHeight =
79                (int) (CONTENT_HEIGHT_DIP * getResources().getDisplayMetrics().density + 0.5f);
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    public CharSequence getTitle() {
109        return mTitle;
110    }
111
112    public CharSequence getSubtitle() {
113        return mSubtitle;
114    }
115
116    private void initTitle() {
117        if (mTitleLayout == null) {
118            LayoutInflater inflater = LayoutInflater.from(getContext());
119            mTitleLayout = (LinearLayout) inflater.inflate(R.layout.action_bar_title_item, null);
120            mTitleView = (TextView) mTitleLayout.findViewById(R.id.action_bar_title);
121            mSubtitleView = (TextView) mTitleLayout.findViewById(R.id.action_bar_subtitle);
122            if (mTitle != null) {
123                mTitleView.setText(mTitle);
124            }
125            if (mSubtitle != null) {
126                mSubtitleView.setText(mSubtitle);
127            }
128            addView(mTitleLayout);
129        } else {
130            mTitleView.setText(mTitle);
131            mSubtitleView.setText(mSubtitle);
132            if (mTitleLayout.getParent() == null) {
133                addView(mTitleLayout);
134            }
135        }
136    }
137
138    public void initForMode(final ActionMode mode) {
139        if (mCloseButton == null) {
140            mCloseButton = new ImageButton(getContext());
141            mCloseButton.setImageDrawable(mCloseDrawable);
142            mCloseButton.setBackgroundDrawable(null);
143        }
144        mCloseButton.setOnClickListener(new OnClickListener() {
145            public void onClick(View v) {
146                mode.finish();
147            }
148        });
149        addView(mCloseButton);
150
151        final MenuBuilder menu = (MenuBuilder) mode.getMenu();
152        mMenuView = (ActionMenuView) menu.getMenuView(MenuBuilder.TYPE_ACTION_BUTTON, this);
153        mMenuView.setOverflowReserved(true);
154        mMenuView.updateChildren(false);
155        addView(mMenuView);
156    }
157
158    public void closeMode() {
159        removeAllViews();
160        mCustomView = null;
161        mMenuView = null;
162    }
163
164    @Override
165    protected LayoutParams generateDefaultLayoutParams() {
166        // Used by custom views if they don't supply layout params. Everything else
167        // added to an ActionBarContextView should have them already.
168        return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
169    }
170
171    @Override
172    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
173        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
174        if (widthMode != MeasureSpec.EXACTLY) {
175            throw new IllegalStateException(getClass().getSimpleName() + " can only be used " +
176                    "with android:layout_width=\"match_parent\" (or fill_parent)");
177        }
178
179        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
180        if (heightMode != MeasureSpec.AT_MOST) {
181            throw new IllegalStateException(getClass().getSimpleName() + " can only be used " +
182                    "with android:layout_height=\"wrap_content\"");
183        }
184
185        final int contentWidth = MeasureSpec.getSize(widthMeasureSpec);
186        final int itemMargin = mItemPadding;
187
188        int availableWidth = contentWidth - getPaddingLeft() - getPaddingRight();
189        final int height = mContentHeight - getPaddingTop() - getPaddingBottom();
190        final int childSpecHeight = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
191
192        if (mCloseButton != null) {
193            availableWidth = measureChildView(mCloseButton, availableWidth,
194                    childSpecHeight, itemMargin);
195        }
196
197        if (mTitleLayout != null && mCustomView == null) {
198            availableWidth = measureChildView(mTitleLayout, availableWidth,
199                    childSpecHeight, itemMargin);
200        }
201
202        final int childCount = getChildCount();
203        for (int i = 0; i < childCount; i++) {
204            final View child = getChildAt(i);
205            if (child == mCloseButton || child == mTitleLayout || child == mCustomView) {
206                continue;
207            }
208
209            availableWidth = measureChildView(child, availableWidth, childSpecHeight, itemMargin);
210        }
211
212        if (mCustomView != null) {
213            LayoutParams lp = mCustomView.getLayoutParams();
214            final int customWidthMode = lp.width != LayoutParams.WRAP_CONTENT ?
215                    MeasureSpec.EXACTLY : MeasureSpec.AT_MOST;
216            final int customWidth = lp.width >= 0 ?
217                    Math.min(lp.width, availableWidth) : availableWidth;
218            final int customHeightMode = lp.height != LayoutParams.WRAP_CONTENT ?
219                    MeasureSpec.EXACTLY : MeasureSpec.AT_MOST;
220            final int customHeight = lp.height >= 0 ?
221                    Math.min(lp.height, height) : height;
222            mCustomView.measure(MeasureSpec.makeMeasureSpec(customWidth, customWidthMode),
223                    MeasureSpec.makeMeasureSpec(customHeight, customHeightMode));
224        }
225
226        setMeasuredDimension(contentWidth, mContentHeight);
227    }
228
229    @Override
230    protected void onLayout(boolean changed, int l, int t, int r, int b) {
231        int x = getPaddingLeft();
232        final int y = getPaddingTop();
233        final int contentHeight = b - t - getPaddingTop() - getPaddingBottom();
234        final int itemMargin = mItemPadding;
235
236        if (mCloseButton != null && mCloseButton.getVisibility() != GONE) {
237            x += positionChild(mCloseButton, x, y, contentHeight);
238        }
239
240        if (mTitleLayout != null && mCustomView == null) {
241            x += positionChild(mTitleLayout, x, y, contentHeight) + itemMargin;
242        }
243
244        if (mCustomView != null) {
245            x += positionChild(mCustomView, x, y, contentHeight) + itemMargin;
246        }
247
248        x = r - l - getPaddingRight();
249
250        if (mMenuView != null) {
251            x -= positionChildInverse(mMenuView, x + mActionSpacing, y, contentHeight)
252                    - mActionSpacing;
253        }
254    }
255
256    private int measureChildView(View child, int availableWidth, int childSpecHeight, int spacing) {
257        child.measure(MeasureSpec.makeMeasureSpec(availableWidth, MeasureSpec.AT_MOST),
258                childSpecHeight);
259
260        availableWidth -= child.getMeasuredWidth();
261        availableWidth -= spacing;
262
263        return availableWidth;
264    }
265
266    private int positionChild(View child, int x, int y, int contentHeight) {
267        int childWidth = child.getMeasuredWidth();
268        int childHeight = child.getMeasuredHeight();
269        int childTop = y + (contentHeight - childHeight) / 2;
270
271        child.layout(x, childTop, x + childWidth, childTop + childHeight);
272
273        return childWidth;
274    }
275
276    private int positionChildInverse(View child, int x, int y, int contentHeight) {
277        int childWidth = child.getMeasuredWidth();
278        int childHeight = child.getMeasuredHeight();
279        int childTop = y + (contentHeight - childHeight) / 2;
280
281        child.layout(x - childWidth, childTop, x, childTop + childHeight);
282
283        return childWidth;
284    }
285}
286