ActionBarContainer.java revision 4939e2bf3672a3260354263763a50d5f64758f21 
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 */
16
17package com.android.internal.widget;
18
19import android.annotation.NonNull;
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.graphics.Canvas;
23import android.graphics.ColorFilter;
24import android.graphics.Outline;
25import android.graphics.PixelFormat;
26import android.graphics.drawable.Drawable;
27import android.util.AttributeSet;
28import android.view.ActionMode;
29import android.view.MotionEvent;
30import android.view.View;
31import android.view.ViewGroup;
32import android.widget.FrameLayout;
33
34/**
35 * This class acts as a container for the action bar view and action mode context views.
36 * It applies special styles as needed to help handle animated transitions between them.
37 * @hide
38 */
39public class ActionBarContainer extends FrameLayout {
40    private boolean mIsTransitioning;
41    private View mTabContainer;
42    private View mActionBarView;
43    private View mActionContextView;
44
45    private Drawable mBackground;
46    private Drawable mStackedBackground;
47    private Drawable mSplitBackground;
48    private boolean mIsSplit;
49    private boolean mIsStacked;
50    private int mHeight;
51
52    public ActionBarContainer(Context context) {
53        this(context, null);
54    }
55
56    public ActionBarContainer(Context context, AttributeSet attrs) {
57        super(context, attrs);
58
59        // Set a transparent background so that we project appropriately.
60        setBackground(new ActionBarBackgroundDrawable());
61
62        TypedArray a = context.obtainStyledAttributes(attrs,
63                com.android.internal.R.styleable.ActionBar);
64        mBackground = a.getDrawable(com.android.internal.R.styleable.ActionBar_background);
65        mStackedBackground = a.getDrawable(
66                com.android.internal.R.styleable.ActionBar_backgroundStacked);
67        mHeight = a.getDimensionPixelSize(com.android.internal.R.styleable.ActionBar_height, -1);
68
69        if (getId() == com.android.internal.R.id.split_action_bar) {
70            mIsSplit = true;
71            mSplitBackground = a.getDrawable(
72                    com.android.internal.R.styleable.ActionBar_backgroundSplit);
73        }
74        a.recycle();
75
76        setWillNotDraw(mIsSplit ? mSplitBackground == null :
77                mBackground == null && mStackedBackground == null);
78    }
79
80    @Override
81    public void onFinishInflate() {
82        super.onFinishInflate();
83        mActionBarView = findViewById(com.android.internal.R.id.action_bar);
84        mActionContextView = findViewById(com.android.internal.R.id.action_context_bar);
85    }
86
87    public void setPrimaryBackground(Drawable bg) {
88        if (mBackground != null) {
89            mBackground.setCallback(null);
90            unscheduleDrawable(mBackground);
91        }
92        mBackground = bg;
93        if (bg != null) {
94            bg.setCallback(this);
95            if (mActionBarView != null) {
96                mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(),
97                        mActionBarView.getRight(), mActionBarView.getBottom());
98            }
99        }
100        setWillNotDraw(mIsSplit ? mSplitBackground == null :
101                mBackground == null && mStackedBackground == null);
102        invalidate();
103    }
104
105    public void setStackedBackground(Drawable bg) {
106        if (mStackedBackground != null) {
107            mStackedBackground.setCallback(null);
108            unscheduleDrawable(mStackedBackground);
109        }
110        mStackedBackground = bg;
111        if (bg != null) {
112            bg.setCallback(this);
113            if ((mIsStacked && mStackedBackground != null)) {
114                mStackedBackground.setBounds(mTabContainer.getLeft(), mTabContainer.getTop(),
115                        mTabContainer.getRight(), mTabContainer.getBottom());
116            }
117        }
118        setWillNotDraw(mIsSplit ? mSplitBackground == null :
119                mBackground == null && mStackedBackground == null);
120        invalidate();
121    }
122
123    public void setSplitBackground(Drawable bg) {
124        if (mSplitBackground != null) {
125            mSplitBackground.setCallback(null);
126            unscheduleDrawable(mSplitBackground);
127        }
128        mSplitBackground = bg;
129        if (bg != null) {
130            bg.setCallback(this);
131            if (mIsSplit && mSplitBackground != null) {
132                mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight());
133            }
134        }
135        setWillNotDraw(mIsSplit ? mSplitBackground == null :
136                mBackground == null && mStackedBackground == null);
137        invalidate();
138    }
139
140    @Override
141    public void setVisibility(int visibility) {
142        super.setVisibility(visibility);
143        final boolean isVisible = visibility == VISIBLE;
144        if (mBackground != null) mBackground.setVisible(isVisible, false);
145        if (mStackedBackground != null) mStackedBackground.setVisible(isVisible, false);
146        if (mSplitBackground != null) mSplitBackground.setVisible(isVisible, false);
147    }
148
149    @Override
150    protected boolean verifyDrawable(Drawable who) {
151        return (who == mBackground && !mIsSplit) || (who == mStackedBackground && mIsStacked) ||
152                (who == mSplitBackground && mIsSplit) || super.verifyDrawable(who);
153    }
154
155    @Override
156    protected void drawableStateChanged() {
157        super.drawableStateChanged();
158        if (mBackground != null && mBackground.isStateful()) {
159            mBackground.setState(getDrawableState());
160        }
161        if (mStackedBackground != null && mStackedBackground.isStateful()) {
162            mStackedBackground.setState(getDrawableState());
163        }
164        if (mSplitBackground != null && mSplitBackground.isStateful()) {
165            mSplitBackground.setState(getDrawableState());
166        }
167    }
168
169    @Override
170    public void jumpDrawablesToCurrentState() {
171        super.jumpDrawablesToCurrentState();
172        if (mBackground != null) {
173            mBackground.jumpToCurrentState();
174        }
175        if (mStackedBackground != null) {
176            mStackedBackground.jumpToCurrentState();
177        }
178        if (mSplitBackground != null) {
179            mSplitBackground.jumpToCurrentState();
180        }
181    }
182
183    /**
184     * @hide
185     */
186    @Override
187    public void onResolveDrawables(int layoutDirection) {
188        super.onResolveDrawables(layoutDirection);
189        if (mBackground != null) {
190            mBackground.setLayoutDirection(layoutDirection);
191        }
192        if (mStackedBackground != null) {
193            mStackedBackground.setLayoutDirection(layoutDirection);
194        }
195        if (mSplitBackground != null) {
196            mSplitBackground.setLayoutDirection(layoutDirection);
197        }
198    }
199
200    /**
201     * Set the action bar into a "transitioning" state. While transitioning
202     * the bar will block focus and touch from all of its descendants. This
203     * prevents the user from interacting with the bar while it is animating
204     * in or out.
205     *
206     * @param isTransitioning true if the bar is currently transitioning, false otherwise.
207     */
208    public void setTransitioning(boolean isTransitioning) {
209        mIsTransitioning = isTransitioning;
210        setDescendantFocusability(isTransitioning ? FOCUS_BLOCK_DESCENDANTS
211                : FOCUS_AFTER_DESCENDANTS);
212    }
213
214    @Override
215    public boolean onInterceptTouchEvent(MotionEvent ev) {
216        return mIsTransitioning || super.onInterceptTouchEvent(ev);
217    }
218
219    @Override
220    public boolean onTouchEvent(MotionEvent ev) {
221        super.onTouchEvent(ev);
222
223        // An action bar always eats touch events.
224        return true;
225    }
226
227    @Override
228    public boolean onHoverEvent(MotionEvent ev) {
229        super.onHoverEvent(ev);
230
231        // An action bar always eats hover events.
232        return true;
233    }
234
235    public void setTabContainer(ScrollingTabContainerView tabView) {
236        if (mTabContainer != null) {
237            removeView(mTabContainer);
238        }
239        mTabContainer = tabView;
240        if (tabView != null) {
241            addView(tabView);
242            final ViewGroup.LayoutParams lp = tabView.getLayoutParams();
243            lp.width = LayoutParams.MATCH_PARENT;
244            lp.height = LayoutParams.WRAP_CONTENT;
245            tabView.setAllowCollapse(false);
246        }
247    }
248
249    public View getTabContainer() {
250        return mTabContainer;
251    }
252
253    @Override
254    public ActionMode startActionModeForChild(View child, ActionMode.Callback callback) {
255        // No starting an action mode for an action bar child! (Where would it go?)
256        return null;
257    }
258
259    private static boolean isCollapsed(View view) {
260        return view == null || view.getVisibility() == GONE || view.getMeasuredHeight() == 0;
261    }
262
263    private int getMeasuredHeightWithMargins(View view) {
264        final LayoutParams lp = (LayoutParams) view.getLayoutParams();
265        return view.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
266    }
267
268    @Override
269    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
270        if (mActionBarView == null &&
271                MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST && mHeight >= 0) {
272            heightMeasureSpec = MeasureSpec.makeMeasureSpec(
273                    Math.min(mHeight, MeasureSpec.getSize(heightMeasureSpec)), MeasureSpec.AT_MOST);
274        }
275        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
276
277        if (mActionBarView == null) return;
278
279        if (mTabContainer != null && mTabContainer.getVisibility() != GONE) {
280            int nonTabMaxHeight = 0;
281            final int childCount = getChildCount();
282            for (int i = 0; i < childCount; i++) {
283                final View child = getChildAt(i);
284                if (child == mTabContainer) {
285                    continue;
286                }
287                nonTabMaxHeight = Math.max(nonTabMaxHeight, isCollapsed(child) ? 0 :
288                        getMeasuredHeightWithMargins(child));
289            }
290            final int mode = MeasureSpec.getMode(heightMeasureSpec);
291            final int maxHeight = mode == MeasureSpec.AT_MOST ?
292                    MeasureSpec.getSize(heightMeasureSpec) : Integer.MAX_VALUE;
293            setMeasuredDimension(getMeasuredWidth(),
294                    Math.min(nonTabMaxHeight + getMeasuredHeightWithMargins(mTabContainer),
295                            maxHeight));
296        }
297    }
298
299    @Override
300    public void onLayout(boolean changed, int l, int t, int r, int b) {
301        super.onLayout(changed, l, t, r, b);
302
303        final View tabContainer = mTabContainer;
304        final boolean hasTabs = tabContainer != null && tabContainer.getVisibility() != GONE;
305
306        if (tabContainer != null && tabContainer.getVisibility() != GONE) {
307            final int containerHeight = getMeasuredHeight();
308            final LayoutParams lp = (LayoutParams) tabContainer.getLayoutParams();
309            final int tabHeight = tabContainer.getMeasuredHeight();
310            tabContainer.layout(l, containerHeight - tabHeight - lp.bottomMargin, r,
311                    containerHeight - lp.bottomMargin);
312        }
313
314        boolean needsInvalidate = false;
315        if (mIsSplit) {
316            if (mSplitBackground != null) {
317                mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight());
318                needsInvalidate = true;
319            }
320        } else {
321            if (mBackground != null) {
322                if (mActionBarView.getVisibility() == View.VISIBLE) {
323                    mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(),
324                            mActionBarView.getRight(), mActionBarView.getBottom());
325                } else if (mActionContextView != null &&
326                        mActionContextView.getVisibility() == View.VISIBLE) {
327                    mBackground.setBounds(mActionContextView.getLeft(), mActionContextView.getTop(),
328                            mActionContextView.getRight(), mActionContextView.getBottom());
329                } else {
330                    mBackground.setBounds(0, 0, 0, 0);
331                }
332                needsInvalidate = true;
333            }
334            mIsStacked = hasTabs;
335            if (hasTabs && mStackedBackground != null) {
336                mStackedBackground.setBounds(tabContainer.getLeft(), tabContainer.getTop(),
337                        tabContainer.getRight(), tabContainer.getBottom());
338                needsInvalidate = true;
339            }
340        }
341
342        if (needsInvalidate) {
343            invalidate();
344        }
345    }
346
347    /**
348     * Dummy drawable so that we don't break background display lists and
349     * projection surfaces.
350     */
351    private class ActionBarBackgroundDrawable extends Drawable {
352        @Override
353        public void draw(Canvas canvas) {
354            if (mIsSplit) {
355                if (mSplitBackground != null) {
356                    mSplitBackground.draw(canvas);
357                }
358            } else {
359                if (mBackground != null) {
360                    mBackground.draw(canvas);
361                }
362                if (mStackedBackground != null && mIsStacked) {
363                    mStackedBackground.draw(canvas);
364                }
365            }
366        }
367
368        @Override
369        public void getOutline(@NonNull Outline outline) {
370            if (mIsSplit) {
371                if (mSplitBackground != null) {
372                    mSplitBackground.getOutline(outline);
373                }
374            } else {
375                // ignore the stacked background for shadow casting
376                if (mBackground != null) {
377                    mBackground.getOutline(outline);
378                }
379            }
380        }
381
382        @Override
383        public void setAlpha(int alpha) {
384        }
385
386        @Override
387        public void setColorFilter(ColorFilter colorFilter) {
388        }
389
390        @Override
391        public int getOpacity() {
392            if (mIsSplit) {
393                if (mSplitBackground != null
394                        && mSplitBackground.getOpacity() == PixelFormat.OPAQUE) {
395                    return PixelFormat.OPAQUE;
396                }
397            } else {
398                if (mIsStacked && (mStackedBackground == null
399                        || mStackedBackground.getOpacity() != PixelFormat.OPAQUE)) {
400                    return PixelFormat.UNKNOWN;
401                }
402                if (!isCollapsed(mActionBarView) && mBackground != null
403                        && mBackground.getOpacity() == PixelFormat.OPAQUE) {
404                    return PixelFormat.OPAQUE;
405                }
406            }
407
408            return PixelFormat.UNKNOWN;
409        }
410    }
411}
412