PanelBar.java revision 3d395c69fa67732ceb2c045d03ea81efa3710afa 
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.util.Log;
22import android.view.MotionEvent;
23import android.view.View;
24import android.widget.FrameLayout;
25
26import java.util.ArrayList;
27
28public abstract class PanelBar extends FrameLayout {
29    public static final boolean DEBUG = false;
30    public static final String TAG = PanelBar.class.getSimpleName();
31    public static final void LOG(String fmt, Object... args) {
32        if (!DEBUG) return;
33        Log.v(TAG, String.format(fmt, args));
34    }
35
36    public static final int STATE_CLOSED = 0;
37    public static final int STATE_OPENING = 1;
38    public static final int STATE_OPEN = 2;
39
40    PanelHolder mPanelHolder;
41    ArrayList<PanelView> mPanels = new ArrayList<PanelView>();
42    PanelView mTouchingPanel;
43    private int mState = STATE_CLOSED;
44    private boolean mTracking;
45
46    float mPanelExpandedFractionSum;
47
48    public void go(int state) {
49        if (DEBUG) LOG("go state: %d -> %d", mState, state);
50        mState = state;
51    }
52
53    public PanelBar(Context context, AttributeSet attrs) {
54        super(context, attrs);
55    }
56
57    @Override
58    protected void onFinishInflate() {
59        super.onFinishInflate();
60    }
61
62    public void addPanel(PanelView pv) {
63        mPanels.add(pv);
64        pv.setBar(this);
65    }
66
67    public void setPanelHolder(PanelHolder ph) {
68        if (ph == null) {
69            Log.e(TAG, "setPanelHolder: null PanelHolder", new Throwable());
70            return;
71        }
72        ph.setBar(this);
73        mPanelHolder = ph;
74        final int N = ph.getChildCount();
75        for (int i=0; i<N; i++) {
76            final View v = ph.getChildAt(i);
77            if (v != null && v instanceof PanelView) {
78                addPanel((PanelView) v);
79            }
80        }
81    }
82
83    public void setBouncerShowing(boolean showing) {
84        if (mPanelHolder != null) {
85            mPanelHolder.setImportantForAccessibility(
86                    showing ? IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
87                            : IMPORTANT_FOR_ACCESSIBILITY_AUTO);
88        }
89    }
90
91    public float getBarHeight() {
92        return getMeasuredHeight();
93    }
94
95    public PanelView selectPanelForTouch(MotionEvent touch) {
96        final int N = mPanels.size();
97        return mPanels.get((int)(N * touch.getX() / getMeasuredWidth()));
98    }
99
100    public boolean panelsEnabled() {
101        return true;
102    }
103
104    @Override
105    public boolean onTouchEvent(MotionEvent event) {
106        // Allow subclasses to implement enable/disable semantics
107        if (!panelsEnabled()) {
108            if (event.getAction() == MotionEvent.ACTION_DOWN) {
109                Log.v(TAG, String.format("onTouch: all panels disabled, ignoring touch at (%d,%d)",
110                        (int) event.getX(), (int) event.getY()));
111            }
112            return false;
113        }
114
115        // figure out which panel needs to be talked to here
116        if (event.getAction() == MotionEvent.ACTION_DOWN) {
117            final PanelView panel = selectPanelForTouch(event);
118            if (panel == null) {
119                // panel is not there, so we'll eat the gesture
120                Log.v(TAG, String.format("onTouch: no panel for touch at (%d,%d)",
121                        (int) event.getX(), (int) event.getY()));
122                mTouchingPanel = null;
123                return true;
124            }
125            boolean enabled = panel.isEnabled();
126            if (DEBUG) LOG("PanelBar.onTouch: state=%d ACTION_DOWN: panel %s %s", mState, panel,
127                    (enabled ? "" : " (disabled)"));
128            if (!enabled) {
129                // panel is disabled, so we'll eat the gesture
130                Log.v(TAG, String.format(
131                        "onTouch: panel (%s) is disabled, ignoring touch at (%d,%d)",
132                        panel, (int) event.getX(), (int) event.getY()));
133                mTouchingPanel = null;
134                return true;
135            }
136            startOpeningPanel(panel);
137        }
138        final boolean result = mTouchingPanel != null
139                ? mTouchingPanel.onTouchEvent(event)
140                : true;
141        return result;
142    }
143
144    // called from PanelView when self-expanding, too
145    public void startOpeningPanel(PanelView panel) {
146        if (DEBUG) LOG("startOpeningPanel: " + panel);
147        mTouchingPanel = panel;
148        mPanelHolder.setSelectedPanel(mTouchingPanel);
149        for (PanelView pv : mPanels) {
150            if (pv != panel) {
151                pv.collapse(false /* delayed */, 1.0f /* speedUpFactor */);
152            }
153        }
154    }
155
156    public abstract void panelScrimMinFractionChanged(float minFraction);
157
158    /**
159     * @param panel the panel which changed its expansion state
160     * @param frac the fraction from the expansion in [0, 1]
161     * @param expanded whether the panel is currently expanded; this is independent from the
162     *                 fraction as the panel also might be expanded if the fraction is 0
163     */
164    public void panelExpansionChanged(PanelView panel, float frac, boolean expanded) {
165        boolean fullyClosed = true;
166        PanelView fullyOpenedPanel = null;
167        if (DEBUG) LOG("panelExpansionChanged: start state=%d panel=%s", mState, panel.getName());
168        mPanelExpandedFractionSum = 0f;
169        for (PanelView pv : mPanels) {
170            pv.setVisibility(expanded ? View.VISIBLE : View.INVISIBLE);
171            // adjust any other panels that may be partially visible
172            if (expanded) {
173                if (mState == STATE_CLOSED) {
174                    go(STATE_OPENING);
175                    onPanelPeeked();
176                }
177                fullyClosed = false;
178                final float thisFrac = pv.getExpandedFraction();
179                mPanelExpandedFractionSum += thisFrac;
180                if (DEBUG) LOG("panelExpansionChanged:  -> %s: f=%.1f", pv.getName(), thisFrac);
181                if (panel == pv) {
182                    if (thisFrac == 1f) fullyOpenedPanel = panel;
183                }
184            }
185        }
186        mPanelExpandedFractionSum /= mPanels.size();
187        if (fullyOpenedPanel != null && !mTracking) {
188            go(STATE_OPEN);
189            onPanelFullyOpened(fullyOpenedPanel);
190        } else if (fullyClosed && !mTracking && mState != STATE_CLOSED) {
191            go(STATE_CLOSED);
192            onAllPanelsCollapsed();
193        }
194
195        if (DEBUG) LOG("panelExpansionChanged: end state=%d [%s%s ]", mState,
196                (fullyOpenedPanel!=null)?" fullyOpened":"", fullyClosed?" fullyClosed":"");
197    }
198
199    public void collapseAllPanels(boolean animate, boolean delayed, float speedUpFactor) {
200        boolean waiting = false;
201        for (PanelView pv : mPanels) {
202            if (animate && !pv.isFullyCollapsed()) {
203                pv.collapse(delayed, speedUpFactor);
204                waiting = true;
205            } else {
206                pv.resetViews();
207                pv.setExpandedFraction(0); // just in case
208                pv.cancelPeek();
209            }
210        }
211        if (DEBUG) LOG("collapseAllPanels: animate=%s waiting=%s", animate, waiting);
212        if (!waiting && mState != STATE_CLOSED) {
213            // it's possible that nothing animated, so we replicate the termination
214            // conditions of panelExpansionChanged here
215            go(STATE_CLOSED);
216            onAllPanelsCollapsed();
217        }
218    }
219
220    public void onPanelPeeked() {
221        if (DEBUG) LOG("onPanelPeeked");
222    }
223
224    public void onAllPanelsCollapsed() {
225        if (DEBUG) LOG("onAllPanelsCollapsed");
226    }
227
228    public void onPanelFullyOpened(PanelView openPanel) {
229        if (DEBUG) LOG("onPanelFullyOpened");
230    }
231
232    public void onTrackingStarted(PanelView panel) {
233        mTracking = true;
234    }
235
236    public void onTrackingStopped(PanelView panel, boolean expand) {
237        mTracking = false;
238    }
239
240    public void onExpandingFinished() {
241
242    }
243
244    public void onClosingFinished() {
245
246    }
247}
248