feat(capslock): Added caps lock checker

qtox.pro

@@ -93,6 +93,10 @@ contains(DEFINES, QTOX_PLATFORM_EXT) {
     SOURCES += src/platform/autorun_win.cpp \
                src/platform/autorun_xdg.cpp \
                src/platform/autorun_osx.cpp
+
+    HEADERS += src/platform/capslock.h
+    SOURCES += src/platform/capslock_win.cpp \
+               src/platform/capslock_x11.cpp
 }
 
 # Rules for Windows, Mac OSX, and Linux

src/platform/capslock.h

@@ -0,0 +1,33 @@
+/*
+    Copyright © 2016 by The qTox Project
+
+    This file is part of qTox, a Qt-based graphical interface for Tox.
+
+    qTox is libre software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    qTox is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with qTox.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef QTOX_PLATFORM_EXT
+
+#ifndef PLATFORM_CAPSLOCK_H
+#define PLATFORM_CAPSLOCK_H
+
+
+namespace Platform
+{
+    bool capsLockEnabled();
+}
+
+#endif // PLATFORM_CAPSLOCK_H
+
+#endif // QTOX_PLATFORM_EXT

src/platform/capslock_win.cpp

@@ -0,0 +1,30 @@
+/*
+    Copyright © 2016 by The qTox Project
+
+    This file is part of qTox, a Qt-based graphical interface for Tox.
+
+    qTox is libre software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    qTox is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with qTox.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <QtCore/qsystemdetection.h>
+#ifdef Q_OS_WIN32
+#include <windows.h>
+#include "src/platform/capslock.h"
+
+bool Platform::checkCapsLock()
+{
+    return GetKeyState(VK_CAPITAL) == 1;
+}
+
+#endif  // Q_OS_WIN32

src/platform/capslock_x11.cpp

@@ -0,0 +1,43 @@
+/*
+    Copyright © 2016 by The qTox Project
+
+    This file is part of qTox, a Qt-based graphical interface for Tox.
+
+    qTox is libre software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    qTox is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with qTox.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <QtCore/qsystemdetection.h>
+#if defined(Q_OS_UNIX) && !defined(__APPLE__) && !defined(__MACH__)
+#include <X11/XKBlib.h>
+#include "src/platform/capslock.h"
+#undef KeyPress
+#undef KeyRelease
+#undef FocusIn
+#undef FocusOut
+
+bool Platform::capsLockEnabled()
+{
+    Display * d = XOpenDisplay((char*)0);
+    bool caps_state = false;
+    if (d)
+    {
+        unsigned n;
+        XkbGetIndicatorState(d, XkbUseCoreKbd, &n);
+        caps_state = (n & 0x01) == 1;
+    }
+    return caps_state;
+}
+
+
+#endif  // Q_WS_X11