NotificationPanelView.java revision b6d85ebfe4f9f5d3b7d7ab7b6123af02a0deb516 
1/*
2 * Copyright (C) 2012 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.systemui.statusbar.phone;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.view.MotionEvent;
22import android.view.View;
23import android.view.accessibility.AccessibilityEvent;
24
25import com.android.systemui.R;
26import com.android.systemui.statusbar.GestureRecorder;
27import com.android.systemui.statusbar.stack.NotificationStackScrollLayout;
28
29public class NotificationPanelView extends PanelView {
30    public static final boolean DEBUG_GESTURES = true;
31
32    PhoneStatusBar mStatusBar;
33    private NotificationStackScrollLayout mNotificationStackScroller;
34    private int[] mTempLocation = new int[2];
35    private int[] mTempChildLocation = new int[2];
36    private View mNotificationParent;
37
38
39    public NotificationPanelView(Context context, AttributeSet attrs) {
40        super(context, attrs);
41    }
42
43    public void setStatusBar(PhoneStatusBar bar) {
44        if (mStatusBar != null) {
45            mStatusBar.setOnFlipRunnable(null);
46        }
47        mStatusBar = bar;
48        if (bar != null) {
49            mStatusBar.setOnFlipRunnable(new Runnable() {
50                @Override
51                public void run() {
52                    requestPanelHeightUpdate();
53                }
54            });
55        }
56    }
57
58    @Override
59    protected void onFinishInflate() {
60        super.onFinishInflate();
61
62        mNotificationStackScroller = (NotificationStackScrollLayout)
63                findViewById(R.id.notification_stack_scroller);
64        mNotificationParent = findViewById(R.id.notification_container_parent);
65    }
66
67    @Override
68    public void fling(float vel, boolean always) {
69        GestureRecorder gr = ((PhoneStatusBarView) mBar).mBar.getGestureRecorder();
70        if (gr != null) {
71            gr.tag(
72                "fling " + ((vel > 0) ? "open" : "closed"),
73                "notifications,v=" + vel);
74        }
75        super.fling(vel, always);
76    }
77
78    @Override
79    public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
80        if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED) {
81            event.getText()
82                    .add(getContext().getString(R.string.accessibility_desc_notification_shade));
83            return true;
84        }
85
86        return super.dispatchPopulateAccessibilityEvent(event);
87    }
88
89    /**
90     * Gets the relative position of a view on the screen in regard to this view.
91     *
92     * @param requestedView the view we want to find the relative position for
93     * @return
94     */
95    private int getRelativeTop(View requestedView) {
96        getLocationOnScreen(mTempLocation);
97        requestedView.getLocationOnScreen(mTempChildLocation);
98        return mTempChildLocation[1] - mTempLocation[1];
99    }
100
101    @Override
102    public boolean onTouchEvent(MotionEvent event) {
103        // TODO: Handle doublefinger swipe to notifications again. Look at history for a reference
104        // implementation.
105        return super.onTouchEvent(event);
106    }
107
108    @Override
109    protected boolean isScrolledToBottom() {
110        if (!isInSettings()) {
111            return mNotificationStackScroller.isScrolledToBottom();
112        }
113        return super.isScrolledToBottom();
114    }
115
116    @Override
117    protected int getMaxPanelHeight() {
118        if (!isInSettings()) {
119            int maxPanelHeight = super.getMaxPanelHeight();
120            int emptyBottomMargin = mNotificationStackScroller.getEmptyBottomMargin();
121            return maxPanelHeight - emptyBottomMargin;
122        }
123        return super.getMaxPanelHeight();
124    }
125
126    private boolean isInSettings() {
127        return mStatusBar != null && mStatusBar.isFlippedToSettings();
128    }
129
130    @Override
131    protected void onHeightUpdated(float expandedHeight) {
132        updateNotificationStackHeight(expandedHeight);
133    }
134
135    /**
136     * Update the height of the {@link #mNotificationStackScroller} to the new expanded height.
137     * This is much more efficient than doing it over the layout pass.
138     *
139     * @param expandedHeight the new expanded height
140     */
141    private void updateNotificationStackHeight(float expandedHeight) {
142        float childOffset = getRelativeTop(mNotificationStackScroller)
143                - mNotificationParent.getTranslationY();
144        int newStackHeight = (int) (expandedHeight - childOffset);
145        int itemHeight = mNotificationStackScroller.getItemHeight();
146        int bottomStackPeekSize = mNotificationStackScroller.getBottomStackPeekSize();
147        int minStackHeight = itemHeight + bottomStackPeekSize;
148        if (newStackHeight >= minStackHeight) {
149            mNotificationParent.setTranslationY(0);
150            mNotificationStackScroller.setCurrentStackHeight(newStackHeight);
151        } else {
152
153            // We did not reach the position yet where we actually start growing,
154            // so we translate the stack upwards.
155            int translationY = (newStackHeight - minStackHeight);
156            // A slight parallax effect is introduced in order for the stack to catch up with
157            // the top card.
158            float partiallyThere = (float) newStackHeight / minStackHeight;
159            partiallyThere = Math.max(0, partiallyThere);
160            translationY += (1 - partiallyThere) * bottomStackPeekSize;
161            mNotificationParent.setTranslationY(translationY);
162            mNotificationStackScroller.setCurrentStackHeight(
163                    (int) (expandedHeight - (childOffset + translationY)));
164        }
165    }
166
167    @Override
168    protected int getDesiredMeasureHeight() {
169        return mMaxPanelHeight;
170    }
171}
172