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 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 float getBarHeight() {
84        return getMeasuredHeight();
85    }
86
87    public PanelView selectPanelForTouch(MotionEvent touch) {
88        final int N = mPanels.size();
89        return mPanels.get((int)(N * touch.getX() / getMeasuredWidth()));
90    }
91
92    public boolean panelsEnabled() {
93        return true;
94    }
95
96    @Override
97    public boolean onTouchEvent(MotionEvent event) {
98        // Allow subclasses to implement enable/disable semantics
99        if (!panelsEnabled()) {
100            if (event.getAction() == MotionEvent.ACTION_DOWN) {
101                Log.v(TAG, String.format("onTouch: all panels disabled, ignoring touch at (%d,%d)",
102                        (int) event.getX(), (int) event.getY()));
103            }
104            return false;
105        }
106
107        // figure out which panel needs to be talked to here
108        if (event.getAction() == MotionEvent.ACTION_DOWN) {
109            final PanelView panel = selectPanelForTouch(event);
110            if (panel == null) {
111                // panel is not there, so we'll eat the gesture
112                Log.v(TAG, String.format("onTouch: no panel for touch at (%d,%d)",
113                        (int) event.getX(), (int) event.getY()));
114                mTouchingPanel = null;
115                return true;
116            }
117            boolean enabled = panel.isEnabled();
118            if (DEBUG) LOG("PanelBar.onTouch: state=%d ACTION_DOWN: panel %s %s", mState, panel,
119                    (enabled ? "" : " (disabled)"));
120            if (!enabled) {
121                // panel is disabled, so we'll eat the gesture
122                Log.v(TAG, String.format(
123                        "onTouch: panel (%s) is disabled, ignoring touch at (%d,%d)",
124                        panel, (int) event.getX(), (int) event.getY()));
125                mTouchingPanel = null;
126                return true;
127            }
128            startOpeningPanel(panel);
129        }
130        final boolean result = mTouchingPanel != null
131                ? mTouchingPanel.onTouchEvent(event)
132                : true;
133        return result;
134    }
135
136    // called from PanelView when self-expanding, too
137    public void startOpeningPanel(PanelView panel) {
138        if (DEBUG) LOG("startOpeningPanel: " + panel);
139        mTouchingPanel = panel;
140        mPanelHolder.setSelectedPanel(mTouchingPanel);
141        for (PanelView pv : mPanels) {
142            if (pv != panel) {
143                pv.collapse(false /* delayed */);
144            }
145        }
146    }
147
148    /**
149     * @param panel the panel which changed its expansion state
150     * @param frac the fraction from the expansion in [0, 1]
151     * @param expanded whether the panel is currently expanded; this is independent from the
152     *                 fraction as the panel also might be expanded if the fraction is 0
153     */
154    public void panelExpansionChanged(PanelView panel, float frac, boolean expanded) {
155        boolean fullyClosed = true;
156        PanelView fullyOpenedPanel = null;
157        if (DEBUG) LOG("panelExpansionChanged: start state=%d panel=%s", mState, panel.getName());
158        mPanelExpandedFractionSum = 0f;
159        for (PanelView pv : mPanels) {
160            boolean visible = pv.getExpandedHeight() > 0;
161            pv.setVisibility(visible ? View.VISIBLE : View.GONE);
162            // adjust any other panels that may be partially visible
163            if (expanded) {
164                if (mState == STATE_CLOSED) {
165                    go(STATE_OPENING);
166                    onPanelPeeked();
167                }
168                fullyClosed = false;
169                final float thisFrac = pv.getExpandedFraction();
170                mPanelExpandedFractionSum += (visible ? thisFrac : 0);
171                if (DEBUG) LOG("panelExpansionChanged:  -> %s: f=%.1f", pv.getName(), thisFrac);
172                if (panel == pv) {
173                    if (thisFrac == 1f) fullyOpenedPanel = panel;
174                }
175            }
176        }
177        mPanelExpandedFractionSum /= mPanels.size();
178        if (fullyOpenedPanel != null && !mTracking) {
179            go(STATE_OPEN);
180            onPanelFullyOpened(fullyOpenedPanel);
181        } else if (fullyClosed && !mTracking && mState != STATE_CLOSED) {
182            go(STATE_CLOSED);
183            onAllPanelsCollapsed();
184        }
185
186        if (DEBUG) LOG("panelExpansionChanged: end state=%d [%s%s ]", mState,
187                (fullyOpenedPanel!=null)?" fullyOpened":"", fullyClosed?" fullyClosed":"");
188    }
189
190    public void collapseAllPanels(boolean animate) {
191        boolean waiting = false;
192        for (PanelView pv : mPanels) {
193            if (animate && !pv.isFullyCollapsed()) {
194                pv.collapse(true /* delayed */);
195                waiting = true;
196            } else {
197                pv.resetViews();
198                pv.setExpandedFraction(0); // just in case
199                pv.setVisibility(View.GONE);
200                pv.cancelPeek();
201            }
202        }
203        if (DEBUG) LOG("collapseAllPanels: animate=%s waiting=%s", animate, waiting);
204        if (!waiting && mState != STATE_CLOSED) {
205            // it's possible that nothing animated, so we replicate the termination
206            // conditions of panelExpansionChanged here
207            go(STATE_CLOSED);
208            onAllPanelsCollapsed();
209        }
210    }
211
212    public void onPanelPeeked() {
213        if (DEBUG) LOG("onPanelPeeked");
214    }
215
216    public void onAllPanelsCollapsed() {
217        if (DEBUG) LOG("onAllPanelsCollapsed");
218    }
219
220    public void onPanelFullyOpened(PanelView openPanel) {
221        if (DEBUG) LOG("onPanelFullyOpened");
222    }
223
224    public void onTrackingStarted(PanelView panel) {
225        mTracking = true;
226        if (DEBUG && panel != mTouchingPanel) {
227            LOG("shouldn't happen: onTrackingStarted(%s) != mTouchingPanel(%s)",
228                    panel, mTouchingPanel);
229        }
230    }
231
232    public void onTrackingStopped(PanelView panel, boolean expand) {
233        mTracking = false;
234    }
235
236    public void onExpandingFinished() {
237
238    }
239
240    public void onClosingFinished() {
241
242    }
243}
244