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(@NonNull 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
159        final int[] state = getDrawableState();
160        boolean changed = false;
161
162        final Drawable background = mBackground;
163        if (background != null && background.isStateful()) {
164            changed |= background.setState(state);
165        }
166
167        final Drawable stackedBackground = mStackedBackground;
168        if (stackedBackground != null && stackedBackground.isStateful()) {
169            changed |= stackedBackground.setState(state);
170        }
171
172        final Drawable splitBackground = mSplitBackground;
173        if (splitBackground != null && splitBackground.isStateful()) {
174            changed |= splitBackground.setState(state);
175        }
176
177        if (changed) {
178            invalidate();
179        }
180    }
181
182    @Override
183    public void jumpDrawablesToCurrentState() {
184        super.jumpDrawablesToCurrentState();
185        if (mBackground != null) {
186            mBackground.jumpToCurrentState();
187        }
188        if (mStackedBackground != null) {
189            mStackedBackground.jumpToCurrentState();
190        }
191        if (mSplitBackground != null) {
192            mSplitBackground.jumpToCurrentState();
193        }
194    }
195
196    /**
197     * @hide
198     */
199    @Override
200    public void onResolveDrawables(int layoutDirection) {
201        super.onResolveDrawables(layoutDirection);
202        if (mBackground != null) {
203            mBackground.setLayoutDirection(layoutDirection);
204        }
205        if (mStackedBackground != null) {
206            mStackedBackground.setLayoutDirection(layoutDirection);
207        }
208        if (mSplitBackground != null) {
209            mSplitBackground.setLayoutDirection(layoutDirection);
210        }
211    }
212
213    /**
214     * Set the action bar into a "transitioning" state. While transitioning
215     * the bar will block focus and touch from all of its descendants. This
216     * prevents the user from interacting with the bar while it is animating
217     * in or out.
218     *
219     * @param isTransitioning true if the bar is currently transitioning, false otherwise.
220     */
221    public void setTransitioning(boolean isTransitioning) {
222        mIsTransitioning = isTransitioning;
223        setDescendantFocusability(isTransitioning ? FOCUS_BLOCK_DESCENDANTS
224                : FOCUS_AFTER_DESCENDANTS);
225    }
226
227    @Override
228    public boolean onInterceptTouchEvent(MotionEvent ev) {
229        return mIsTransitioning || super.onInterceptTouchEvent(ev);
230    }
231
232    @Override
233    public boolean onTouchEvent(MotionEvent ev) {
234        super.onTouchEvent(ev);
235
236        // An action bar always eats touch events.
237        return true;
238    }
239
240    @Override
241    public boolean onHoverEvent(MotionEvent ev) {
242        super.onHoverEvent(ev);
243
244        // An action bar always eats hover events.
245        return true;
246    }
247
248    public void setTabContainer(ScrollingTabContainerView tabView) {
249        if (mTabContainer != null) {
250            removeView(mTabContainer);
251        }
252        mTabContainer = tabView;
253        if (tabView != null) {
254            addView(tabView);
255            final ViewGroup.LayoutParams lp = tabView.getLayoutParams();
256            lp.width = LayoutParams.MATCH_PARENT;
257            lp.height = LayoutParams.WRAP_CONTENT;
258            tabView.setAllowCollapse(false);
259        }
260    }
261
262    public View getTabContainer() {
263        return mTabContainer;
264    }
265
266    @Override
267    public ActionMode startActionModeForChild(
268            View child, ActionMode.Callback callback, int type) {
269        if (type != ActionMode.TYPE_PRIMARY) {
270            return super.startActionModeForChild(child, callback, type);
271        }
272        return null;
273    }
274
275    private static boolean isCollapsed(View view) {
276        return view == null || view.getVisibility() == GONE || view.getMeasuredHeight() == 0;
277    }
278
279    private int getMeasuredHeightWithMargins(View view) {
280        final LayoutParams lp = (LayoutParams) view.getLayoutParams();
281        return view.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
282    }
283
284    @Override
285    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
286        if (mActionBarView == null &&
287                MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST && mHeight >= 0) {
288            heightMeasureSpec = MeasureSpec.makeMeasureSpec(
289                    Math.min(mHeight, MeasureSpec.getSize(heightMeasureSpec)), MeasureSpec.AT_MOST);
290        }
291        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
292
293        if (mActionBarView == null) return;
294
295        if (mTabContainer != null && mTabContainer.getVisibility() != GONE) {
296            int nonTabMaxHeight = 0;
297            final int childCount = getChildCount();
298            for (int i = 0; i < childCount; i++) {
299                final View child = getChildAt(i);
300                if (child == mTabContainer) {
301                    continue;
302                }
303                nonTabMaxHeight = Math.max(nonTabMaxHeight, isCollapsed(child) ? 0 :
304                        getMeasuredHeightWithMargins(child));
305            }
306            final int mode = MeasureSpec.getMode(heightMeasureSpec);
307            final int maxHeight = mode == MeasureSpec.AT_MOST ?
308                    MeasureSpec.getSize(heightMeasureSpec) : Integer.MAX_VALUE;
309            setMeasuredDimension(getMeasuredWidth(),
310                    Math.min(nonTabMaxHeight + getMeasuredHeightWithMargins(mTabContainer),
311                            maxHeight));
312        }
313    }
314
315    @Override
316    public void onLayout(boolean changed, int l, int t, int r, int b) {
317        super.onLayout(changed, l, t, r, b);
318
319        final View tabContainer = mTabContainer;
320        final boolean hasTabs = tabContainer != null && tabContainer.getVisibility() != GONE;
321
322        if (tabContainer != null && tabContainer.getVisibility() != GONE) {
323            final int containerHeight = getMeasuredHeight();
324            final LayoutParams lp = (LayoutParams) tabContainer.getLayoutParams();
325            final int tabHeight = tabContainer.getMeasuredHeight();
326            tabContainer.layout(l, containerHeight - tabHeight - lp.bottomMargin, r,
327                    containerHeight - lp.bottomMargin);
328        }
329
330        boolean needsInvalidate = false;
331        if (mIsSplit) {
332            if (mSplitBackground != null) {
333                mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight());
334                needsInvalidate = true;
335            }
336        } else {
337            if (mBackground != null) {
338                if (mActionBarView.getVisibility() == View.VISIBLE) {
339                    mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(),
340                            mActionBarView.getRight(), mActionBarView.getBottom());
341                } else if (mActionContextView != null &&
342                        mActionContextView.getVisibility() == View.VISIBLE) {
343                    mBackground.setBounds(mActionContextView.getLeft(), mActionContextView.getTop(),
344                            mActionContextView.getRight(), mActionContextView.getBottom());
345                } else {
346                    mBackground.setBounds(0, 0, 0, 0);
347                }
348                needsInvalidate = true;
349            }
350            mIsStacked = hasTabs;
351            if (hasTabs && mStackedBackground != null) {
352                mStackedBackground.setBounds(tabContainer.getLeft(), tabContainer.getTop(),
353                        tabContainer.getRight(), tabContainer.getBottom());
354                needsInvalidate = true;
355            }
356        }
357
358        if (needsInvalidate) {
359            invalidate();
360        }
361    }
362
363    /**
364     * Dummy drawable so that we don't break background display lists and
365     * projection surfaces.
366     */
367    private class ActionBarBackgroundDrawable extends Drawable {
368        @Override
369        public void draw(Canvas canvas) {
370            if (mIsSplit) {
371                if (mSplitBackground != null) {
372                    mSplitBackground.draw(canvas);
373                }
374            } else {
375                if (mBackground != null) {
376                    mBackground.draw(canvas);
377                }
378                if (mStackedBackground != null && mIsStacked) {
379                    mStackedBackground.draw(canvas);
380                }
381            }
382        }
383
384        @Override
385        public void getOutline(@NonNull Outline outline) {
386            if (mIsSplit) {
387                if (mSplitBackground != null) {
388                    mSplitBackground.getOutline(outline);
389                }
390            } else {
391                // ignore the stacked background for shadow casting
392                if (mBackground != null) {
393                    mBackground.getOutline(outline);
394                }
395            }
396        }
397
398        @Override
399        public void setAlpha(int alpha) {
400        }
401
402        @Override
403        public void setColorFilter(ColorFilter colorFilter) {
404        }
405
406        @Override
407        public int getOpacity() {
408            if (mIsSplit) {
409                if (mSplitBackground != null
410                        && mSplitBackground.getOpacity() == PixelFormat.OPAQUE) {
411                    return PixelFormat.OPAQUE;
412                }
413            } else {
414                if (mIsStacked && (mStackedBackground == null
415                        || mStackedBackground.getOpacity() != PixelFormat.OPAQUE)) {
416                    return PixelFormat.UNKNOWN;
417                }
418                if (!isCollapsed(mActionBarView) && mBackground != null
419                        && mBackground.getOpacity() == PixelFormat.OPAQUE) {
420                    return PixelFormat.OPAQUE;
421                }
422            }
423
424            return PixelFormat.UNKNOWN;
425        }
426    }
427}
428