Add mouse shortcut to expand settings panel

Double-click on extra mouse button to open the settings panel (a
single-click opens the notification panel).

This is consistent with the keyboard shortcut MOD+n+n.

PR #2264 <https://github.com/Genymobile/scrcpy/pull/2264>

Signed-off-by: Romain Vimont <rom@rom1v.com>

app/scrcpy.1

@@ -187,16 +187,16 @@ Enable "show touches" on start, restore the initial value on exit.
 
 It only shows physical touches (not clicks from scrcpy).
 
-.TP
-.B \-v, \-\-version
-Print the version of scrcpy.
-
 .TP
 .BI "\-V, \-\-verbosity " value
 Set the log level ("debug", "info", "warn" or "error").
 
 Default is "info" for release builds, "debug" for debug builds.
 
+.TP
+.B \-v, \-\-version
+Print the version of scrcpy.
+
 .TP
 .B \-w, \-\-stay-awake
 Keep the device on while scrcpy is running, when the device is plugged in.

app/src/cli.c

@@ -179,9 +179,6 @@ scrcpy_print_usage(const char *arg0) {
         "        on exit.\n"
         "        It only shows physical touches (not clicks from scrcpy).\n"
         "\n"
-        "    -v, --version\n"
-        "        Print the version of scrcpy.\n"
-        "\n"
         "    -V, --verbosity value\n"
         "        Set the log level (debug, info, warn or error).\n"
 #ifndef NDEBUG
@@ -189,6 +186,9 @@ scrcpy_print_usage(const char *arg0) {
 #else
         "        Default is info.\n"
 #endif
+        "\n"
+        "    -v, --version\n"
+        "        Print the version of scrcpy.\n"
         "\n"
         "    -w, --stay-awake\n"
         "        Keep the device on while scrcpy is running, when the device\n"

app/src/control_msg.c

@@ -67,6 +67,9 @@ control_msg_serialize(const struct control_msg *msg, unsigned char *buf) {
             buffer_write32be(&buf[17],
                              (uint32_t) msg->inject_scroll_event.vscroll);
             return 21;
+        case CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON:
+            buf[1] = msg->inject_keycode.action;
+            return 2;
         case CONTROL_MSG_TYPE_SET_CLIPBOARD: {
             buf[1] = !!msg->set_clipboard.paste;
             size_t len = write_string(msg->set_clipboard.text,
@@ -77,9 +80,9 @@ control_msg_serialize(const struct control_msg *msg, unsigned char *buf) {
         case CONTROL_MSG_TYPE_SET_SCREEN_POWER_MODE:
             buf[1] = msg->set_screen_power_mode.mode;
             return 2;
-        case CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON:
         case CONTROL_MSG_TYPE_EXPAND_NOTIFICATION_PANEL:
-        case CONTROL_MSG_TYPE_COLLAPSE_NOTIFICATION_PANEL:
+        case CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL:
+        case CONTROL_MSG_TYPE_COLLAPSE_PANELS:
         case CONTROL_MSG_TYPE_GET_CLIPBOARD:
         case CONTROL_MSG_TYPE_ROTATE_DEVICE:
             // no additional data

app/src/control_msg.h

@@ -27,7 +27,8 @@ enum control_msg_type {
     CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT,
     CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON,
     CONTROL_MSG_TYPE_EXPAND_NOTIFICATION_PANEL,
-    CONTROL_MSG_TYPE_COLLAPSE_NOTIFICATION_PANEL,
+    CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL,
+    CONTROL_MSG_TYPE_COLLAPSE_PANELS,
     CONTROL_MSG_TYPE_GET_CLIPBOARD,
     CONTROL_MSG_TYPE_SET_CLIPBOARD,
     CONTROL_MSG_TYPE_SET_SCREEN_POWER_MODE,
@@ -64,6 +65,10 @@ struct control_msg {
             int32_t hscroll;
             int32_t vscroll;
         } inject_scroll_event;
+        struct {
+            enum android_keyevent_action action; // action for the BACK key
+            // screen may only be turned on on ACTION_DOWN
+        } back_or_screen_on;
         struct {
             char *text; // owned, to be freed by free()
             bool paste;

app/src/input_manager.c

@@ -72,6 +72,10 @@ input_manager_init(struct input_manager *im,
     im->sdl_shortcut_mods.count = shortcut_mods->count;
 
     im->vfinger_down = false;
+
+    im->last_keycode = SDLK_UNKNOWN;
+    im->last_mod = 0;
+    im->key_repeat = 0;
 }
 
 static void
@@ -146,13 +150,25 @@ action_cut(struct controller *controller, int actions) {
 }
 
 // turn the screen on if it was off, press BACK otherwise
+// If the screen is off, it is turned on only on ACTION_DOWN
 static void
-press_back_or_turn_screen_on(struct controller *controller) {
+press_back_or_turn_screen_on(struct controller *controller, int actions) {
     struct control_msg msg;
     msg.type = CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON;
 
-    if (!controller_push_msg(controller, &msg)) {
-        LOGW("Could not request 'press back or turn screen on'");
+    if (actions & ACTION_DOWN) {
+        msg.back_or_screen_on.action = AKEY_EVENT_ACTION_DOWN;
+        if (!controller_push_msg(controller, &msg)) {
+            LOGW("Could not request 'press back or turn screen on'");
+            return;
+        }
+    }
+
+    if (actions & ACTION_UP) {
+        msg.back_or_screen_on.action = AKEY_EVENT_ACTION_UP;
+        if (!controller_push_msg(controller, &msg)) {
+            LOGW("Could not request 'press back or turn screen on'");
+        }
     }
 }
 
@@ -167,9 +183,19 @@ expand_notification_panel(struct controller *controller) {
 }
 
 static void
-collapse_notification_panel(struct controller *controller) {
+expand_settings_panel(struct controller *controller) {
     struct control_msg msg;
-    msg.type = CONTROL_MSG_TYPE_COLLAPSE_NOTIFICATION_PANEL;
+    msg.type = CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL;
+
+    if (!controller_push_msg(controller, &msg)) {
+        LOGW("Could not request 'expand settings panel'");
+    }
+}
+
+static void
+collapse_panels(struct controller *controller) {
+    struct control_msg msg;
+    msg.type = CONTROL_MSG_TYPE_COLLAPSE_PANELS;
 
     if (!controller_push_msg(controller, &msg)) {
         LOGW("Could not request 'collapse notification panel'");
@@ -372,16 +398,27 @@ input_manager_process_key(struct input_manager *im,
     // control: indicates the state of the command-line option --no-control
     bool control = im->control;
 
-    bool smod = is_shortcut_mod(im, event->keysym.mod);
-
     struct controller *controller = im->controller;
 
     SDL_Keycode keycode = event->keysym.sym;
+    uint16_t mod = event->keysym.mod;
     bool down = event->type == SDL_KEYDOWN;
     bool ctrl = event->keysym.mod & KMOD_CTRL;
     bool shift = event->keysym.mod & KMOD_SHIFT;
     bool repeat = event->repeat;
 
+    bool smod = is_shortcut_mod(im, mod);
+
+    if (down && !repeat) {
+        if (keycode == im->last_keycode && mod == im->last_mod) {
+            ++im->key_repeat;
+        } else {
+            im->key_repeat = 0;
+            im->last_keycode = keycode;
+            im->last_mod = mod;
+        }
+    }
+
     // The shortcut modifier is pressed
     if (smod) {
         int action = down ? ACTION_DOWN : ACTION_UP;
@@ -486,9 +523,11 @@ input_manager_process_key(struct input_manager *im,
             case SDLK_n:
                 if (control && !repeat && down) {
                     if (shift) {
-                        collapse_notification_panel(controller);
-                    } else {
+                        collapse_panels(controller);
+                    } else if (im->key_repeat == 0) {
                         expand_notification_panel(controller);
+                    } else {
+                        expand_settings_panel(controller);
                     }
                 }
                 return;
@@ -646,13 +685,27 @@ input_manager_process_mouse_button(struct input_manager *im,
     }
 
     bool down = event->type == SDL_MOUSEBUTTONDOWN;
-    if (!im->forward_all_clicks && down) {
+    if (!im->forward_all_clicks) {
+        int action = down ? ACTION_DOWN : ACTION_UP;
+
+        if (control && event->button == SDL_BUTTON_X1) {
+            action_app_switch(im->controller, action);
+            return;
+        }
+        if (control && event->button == SDL_BUTTON_X2 && down) {
+            if (event->clicks < 2) {
+                expand_notification_panel(im->controller);
+            } else {
+                expand_settings_panel(im->controller);
+            }
+            return;
+        }
         if (control && event->button == SDL_BUTTON_RIGHT) {
-            press_back_or_turn_screen_on(im->controller);
+            press_back_or_turn_screen_on(im->controller, action);
             return;
         }
         if (control && event->button == SDL_BUTTON_MIDDLE) {
-            action_home(im->controller, ACTION_DOWN | ACTION_UP);
+            action_home(im->controller, action);
             return;
         }
 
@@ -665,7 +718,9 @@ input_manager_process_mouse_button(struct input_manager *im,
             bool outside = x < r->x || x >= r->x + r->w
                         || y < r->y || y >= r->y + r->h;
             if (outside) {
-                screen_resize_to_fit(im->screen);
+                if (down) {
+                    screen_resize_to_fit(im->screen);
+                }
                 return;
             }
         }

app/src/input_manager.h

@@ -33,6 +33,13 @@ struct input_manager {
     } sdl_shortcut_mods;
 
     bool vfinger_down;
+
+    // Tracks the number of identical consecutive shortcut key down events.
+    // Not to be confused with event->repeat, which counts the number of
+    // system-generated repeated key presses.
+    unsigned key_repeat;
+    SDL_Keycode last_keycode;
+    uint16_t last_mod;
 };
 
 void

app/tests/test_control_msg_serialize.c

@@ -146,14 +146,18 @@ static void test_serialize_inject_scroll_event(void) {
 static void test_serialize_back_or_screen_on(void) {
     struct control_msg msg = {
         .type = CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON,
+        .back_or_screen_on = {
+            .action = AKEY_EVENT_ACTION_UP,
+        },
     };
 
     unsigned char buf[CONTROL_MSG_MAX_SIZE];
     size_t size = control_msg_serialize(&msg, buf);
-    assert(size == 1);
+    assert(size == 2);
 
     const unsigned char expected[] = {
         CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON,
+        0x01, // AKEY_EVENT_ACTION_UP
     };
     assert(!memcmp(buf, expected, sizeof(expected)));
 }
@@ -173,9 +177,9 @@ static void test_serialize_expand_notification_panel(void) {
     assert(!memcmp(buf, expected, sizeof(expected)));
 }
 
-static void test_serialize_collapse_notification_panel(void) {
+static void test_serialize_expand_settings_panel(void) {
     struct control_msg msg = {
-        .type = CONTROL_MSG_TYPE_COLLAPSE_NOTIFICATION_PANEL,
+        .type = CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL,
     };
 
     unsigned char buf[CONTROL_MSG_MAX_SIZE];
@@ -183,7 +187,22 @@ static void test_serialize_collapse_notification_panel(void) {
     assert(size == 1);
 
     const unsigned char expected[] = {
-        CONTROL_MSG_TYPE_COLLAPSE_NOTIFICATION_PANEL,
+        CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL,
+    };
+    assert(!memcmp(buf, expected, sizeof(expected)));
+}
+
+static void test_serialize_collapse_panels(void) {
+    struct control_msg msg = {
+        .type = CONTROL_MSG_TYPE_COLLAPSE_PANELS,
+    };
+
+    unsigned char buf[CONTROL_MSG_MAX_SIZE];
+    size_t size = control_msg_serialize(&msg, buf);
+    assert(size == 1);
+
+    const unsigned char expected[] = {
+        CONTROL_MSG_TYPE_COLLAPSE_PANELS,
     };
     assert(!memcmp(buf, expected, sizeof(expected)));
 }
@@ -270,7 +289,8 @@ int main(int argc, char *argv[]) {
     test_serialize_inject_scroll_event();
     test_serialize_back_or_screen_on();
     test_serialize_expand_notification_panel();
-    test_serialize_collapse_notification_panel();
+    test_serialize_expand_settings_panel();
+    test_serialize_collapse_panels();
     test_serialize_get_clipboard();
     test_serialize_set_clipboard();
     test_serialize_set_screen_power_mode();

server/src/main/java/com/genymobile/scrcpy/ControlMessage.java

@@ -11,11 +11,12 @@ public final class ControlMessage {
     public static final int TYPE_INJECT_SCROLL_EVENT = 3;
     public static final int TYPE_BACK_OR_SCREEN_ON = 4;
     public static final int TYPE_EXPAND_NOTIFICATION_PANEL = 5;
-    public static final int TYPE_COLLAPSE_NOTIFICATION_PANEL = 6;
-    public static final int TYPE_GET_CLIPBOARD = 7;
-    public static final int TYPE_SET_CLIPBOARD = 8;
-    public static final int TYPE_SET_SCREEN_POWER_MODE = 9;
-    public static final int TYPE_ROTATE_DEVICE = 10;
+    public static final int TYPE_EXPAND_SETTINGS_PANEL = 6;
+    public static final int TYPE_COLLAPSE_PANELS = 7;
+    public static final int TYPE_GET_CLIPBOARD = 8;
+    public static final int TYPE_SET_CLIPBOARD = 9;
+    public static final int TYPE_SET_SCREEN_POWER_MODE = 10;
+    public static final int TYPE_ROTATE_DEVICE = 11;
 
     private int type;
     private String text;
@@ -71,6 +72,13 @@ public final class ControlMessage {
         return msg;
     }
 
+    public static ControlMessage createBackOrScreenOn(int action) {
+        ControlMessage msg = new ControlMessage();
+        msg.type = TYPE_BACK_OR_SCREEN_ON;
+        msg.action = action;
+        return msg;
+    }
+
     public static ControlMessage createSetClipboard(String text, boolean paste) {
         ControlMessage msg = new ControlMessage();
         msg.type = TYPE_SET_CLIPBOARD;

server/src/main/java/com/genymobile/scrcpy/ControlMessageReader.java

@@ -11,6 +11,7 @@ public class ControlMessageReader {
     static final int INJECT_KEYCODE_PAYLOAD_LENGTH = 13;
     static final int INJECT_TOUCH_EVENT_PAYLOAD_LENGTH = 27;
     static final int INJECT_SCROLL_EVENT_PAYLOAD_LENGTH = 20;
+    static final int BACK_OR_SCREEN_ON_LENGTH = 1;
     static final int SET_SCREEN_POWER_MODE_PAYLOAD_LENGTH = 1;
     static final int SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH = 1;
 
@@ -66,15 +67,18 @@ public class ControlMessageReader {
             case ControlMessage.TYPE_INJECT_SCROLL_EVENT:
                 msg = parseInjectScrollEvent();
                 break;
+            case ControlMessage.TYPE_BACK_OR_SCREEN_ON:
+                msg = parseBackOrScreenOnEvent();
+                break;
             case ControlMessage.TYPE_SET_CLIPBOARD:
                 msg = parseSetClipboard();
                 break;
             case ControlMessage.TYPE_SET_SCREEN_POWER_MODE:
                 msg = parseSetScreenPowerMode();
                 break;
-            case ControlMessage.TYPE_BACK_OR_SCREEN_ON:
             case ControlMessage.TYPE_EXPAND_NOTIFICATION_PANEL:
-            case ControlMessage.TYPE_COLLAPSE_NOTIFICATION_PANEL:
+            case ControlMessage.TYPE_EXPAND_SETTINGS_PANEL:
+            case ControlMessage.TYPE_COLLAPSE_PANELS:
             case ControlMessage.TYPE_GET_CLIPBOARD:
             case ControlMessage.TYPE_ROTATE_DEVICE:
                 msg = ControlMessage.createEmpty(type);
@@ -150,6 +154,14 @@ public class ControlMessageReader {
         return ControlMessage.createInjectScrollEvent(position, hScroll, vScroll);
     }
 
+    private ControlMessage parseBackOrScreenOnEvent() {
+        if (buffer.remaining() < BACK_OR_SCREEN_ON_LENGTH) {
+            return null;
+        }
+        int action = toUnsigned(buffer.get());
+        return ControlMessage.createBackOrScreenOn(action);
+    }
+
     private ControlMessage parseSetClipboard() {
         if (buffer.remaining() < SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH) {
             return null;

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -101,13 +101,16 @@ public class Controller {
                 break;
             case ControlMessage.TYPE_BACK_OR_SCREEN_ON:
                 if (device.supportsInputEvents()) {
-                    pressBackOrTurnScreenOn();
+                    pressBackOrTurnScreenOn(msg.getAction());
                 }
                 break;
             case ControlMessage.TYPE_EXPAND_NOTIFICATION_PANEL:
                 Device.expandNotificationPanel();
                 break;
-            case ControlMessage.TYPE_COLLAPSE_NOTIFICATION_PANEL:
+            case ControlMessage.TYPE_EXPAND_SETTINGS_PANEL:
+                Device.expandSettingsPanel();
+                break;
+            case ControlMessage.TYPE_COLLAPSE_PANELS:
                 Device.collapsePanels();
                 break;
             case ControlMessage.TYPE_GET_CLIPBOARD:
@@ -255,12 +258,22 @@ public class Controller {
         }, 200, TimeUnit.MILLISECONDS);
     }
 
-    private boolean pressBackOrTurnScreenOn() {
-        int keycode = Device.isScreenOn() ? KeyEvent.KEYCODE_BACK : KeyEvent.KEYCODE_POWER;
-        if (keepPowerModeOff && keycode == KeyEvent.KEYCODE_POWER) {
+    private boolean pressBackOrTurnScreenOn(int action) {
+        if (Device.isScreenOn()) {
+            return device.injectKeyEvent(action, KeyEvent.KEYCODE_BACK, 0, 0);
+        }
+
+        // Screen is off
+        // Only press POWER on ACTION_DOWN
+        if (action != KeyEvent.ACTION_DOWN) {
+            // do nothing,
+            return true;
+        }
+
+        if (keepPowerModeOff) {
             schedulePowerModeOff();
         }
-        return device.injectKeycode(keycode);
+        return device.injectKeycode(KeyEvent.KEYCODE_POWER);
     }
 
     private boolean setClipboard(String text, boolean paste) {

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -227,6 +227,10 @@ public final class Device {
         SERVICE_MANAGER.getStatusBarManager().expandNotificationsPanel();
     }
 
+    public static void expandSettingsPanel() {
+        SERVICE_MANAGER.getStatusBarManager().expandSettingsPanel();
+    }
+
     public static void collapsePanels() {
         SERVICE_MANAGER.getStatusBarManager().collapsePanels();
     }

server/src/main/java/com/genymobile/scrcpy/wrappers/ActivityManager.java

@@ -14,7 +14,7 @@ public class ActivityManager {
 
     private final IInterface manager;
     private Method getContentProviderExternalMethod;
-    private boolean getContentProviderExternalMethodLegacy;
+    private boolean getContentProviderExternalMethodNewVersion = true;
     private Method removeContentProviderExternalMethod;
 
     public ActivityManager(IInterface manager) {
@@ -29,7 +29,7 @@ public class ActivityManager {
             } catch (NoSuchMethodException e) {
                 // old version
                 getContentProviderExternalMethod = manager.getClass().getMethod("getContentProviderExternal", String.class, int.class, IBinder.class);
-                getContentProviderExternalMethodLegacy = true;
+                getContentProviderExternalMethodNewVersion = false;
             }
         }
         return getContentProviderExternalMethod;
@@ -46,7 +46,7 @@ public class ActivityManager {
         try {
             Method method = getGetContentProviderExternalMethod();
             Object[] args;
-            if (!getContentProviderExternalMethodLegacy) {
+            if (getContentProviderExternalMethodNewVersion) {
                 // new version
                 args = new Object[]{name, ServiceManager.USER_ID, token, null};
             } else {

server/src/main/java/com/genymobile/scrcpy/wrappers/StatusBarManager.java

@@ -11,6 +11,8 @@ public class StatusBarManager {
 
     private final IInterface manager;
     private Method expandNotificationsPanelMethod;
+    private Method expandSettingsPanelMethod;
+    private boolean expandSettingsPanelMethodNewVersion = true;
     private Method collapsePanelsMethod;
 
     public StatusBarManager(IInterface manager) {
@@ -24,6 +26,20 @@ public class StatusBarManager {
         return expandNotificationsPanelMethod;
     }
 
+    private Method getExpandSettingsPanel() throws NoSuchMethodException {
+        if (expandSettingsPanelMethod == null) {
+            try {
+                // Since Android 7: https://android.googlesource.com/platform/frameworks/base.git/+/a9927325eda025504d59bb6594fee8e240d95b01%5E%21/
+                expandSettingsPanelMethod = manager.getClass().getMethod("expandSettingsPanel", String.class);
+            } catch (NoSuchMethodException e) {
+                // old version
+                expandSettingsPanelMethod = manager.getClass().getMethod("expandSettingsPanel");
+                expandSettingsPanelMethodNewVersion = false;
+            }
+        }
+        return expandSettingsPanelMethod;
+    }
+
     private Method getCollapsePanelsMethod() throws NoSuchMethodException {
         if (collapsePanelsMethod == null) {
             collapsePanelsMethod = manager.getClass().getMethod("collapsePanels");
@@ -40,6 +56,21 @@ public class StatusBarManager {
         }
     }
 
+    public void expandSettingsPanel() {
+        try {
+            Method method = getExpandSettingsPanel();
+            if (expandSettingsPanelMethodNewVersion) {
+                // new version
+                method.invoke(manager, (Object) null);
+            } else {
+                // old version
+                method.invoke(manager);
+            }
+        } catch (InvocationTargetException | IllegalAccessException | NoSuchMethodException e) {
+            Ln.e("Could not invoke method", e);
+        }
+    }
+
     public void collapsePanels() {
         try {
             Method method = getCollapsePanelsMethod();

server/src/test/java/com/genymobile/scrcpy/ControlMessageReaderTest.java

@@ -154,6 +154,7 @@ public class ControlMessageReaderTest {
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         DataOutputStream dos = new DataOutputStream(bos);
         dos.writeByte(ControlMessage.TYPE_BACK_OR_SCREEN_ON);
+        dos.writeByte(KeyEvent.ACTION_UP);
 
         byte[] packet = bos.toByteArray();
 
@@ -161,6 +162,7 @@ public class ControlMessageReaderTest {
         ControlMessage event = reader.next();
 
         Assert.assertEquals(ControlMessage.TYPE_BACK_OR_SCREEN_ON, event.getType());
+        Assert.assertEquals(KeyEvent.ACTION_UP, event.getAction());
     }
 
     @Test
@@ -180,19 +182,35 @@ public class ControlMessageReaderTest {
     }
 
     @Test
-    public void testParseCollapseNotificationPanelEvent() throws IOException {
+    public void testParseExpandSettingsPanelEvent() throws IOException {
         ControlMessageReader reader = new ControlMessageReader();
 
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         DataOutputStream dos = new DataOutputStream(bos);
-        dos.writeByte(ControlMessage.TYPE_COLLAPSE_NOTIFICATION_PANEL);
+        dos.writeByte(ControlMessage.TYPE_EXPAND_SETTINGS_PANEL);
 
         byte[] packet = bos.toByteArray();
 
         reader.readFrom(new ByteArrayInputStream(packet));
         ControlMessage event = reader.next();
 
-        Assert.assertEquals(ControlMessage.TYPE_COLLAPSE_NOTIFICATION_PANEL, event.getType());
+        Assert.assertEquals(ControlMessage.TYPE_EXPAND_SETTINGS_PANEL, event.getType());
+    }
+
+    @Test
+    public void testParseCollapsePanelsEvent() throws IOException {
+        ControlMessageReader reader = new ControlMessageReader();
+
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream dos = new DataOutputStream(bos);
+        dos.writeByte(ControlMessage.TYPE_COLLAPSE_PANELS);
+
+        byte[] packet = bos.toByteArray();
+
+        reader.readFrom(new ByteArrayInputStream(packet));
+        ControlMessage event = reader.next();
+
+        Assert.assertEquals(ControlMessage.TYPE_COLLAPSE_PANELS, event.getType());
     }
 
     @Test