feat: global shortcuts to next/previous subtitle (X11 only)

PenguinSubtitlePlayer.pro

@@ -4,7 +4,8 @@
 #
 #-------------------------------------------------
 
-QT       += core gui
+QT       += core gui x11extras
+LIBS     += -lX11
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
@@ -104,7 +105,8 @@ SOURCES += \
     src/parsers/webvttparser.cpp \
     src/parser.cpp \
     src/engine.cpp \
-    src/nccdialog.cpp
+    src/nccdialog.cpp \
+    src/eventfilter.cpp
 
 HEADERS += \
     src/configdialog.h \
@@ -120,7 +122,8 @@ HEADERS += \
     src/parserinterface.h \
     src/parser.h \
     src/engine.h \
-    src/nccdialog.h
+    src/nccdialog.h \
+    src/eventfilter.h
 
 FORMS    += \
     resource/ui/mainwindow.ui

src/eventfilter.cpp

@@ -0,0 +1,42 @@
+#include "eventfilter.h"
+#include "mainwindow.h"
+#include <xcb/xcb.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include <QtX11Extras/QX11Info>
+
+
+void EventFilter::setup(QWidget *target)
+{
+    this->target = target;
+
+    Display * display = QX11Info::display();
+    keycodePrevious = XKeysymToKeycode(display, XK_A);
+    keycodeNext = XKeysymToKeycode(display, XK_S);
+    XGrabKey(display, keycodePrevious, AnyModifier, DefaultRootWindow(display), 1, GrabModeAsync, GrabModeAsync);
+    XGrabKey(display, keycodeNext, AnyModifier, DefaultRootWindow(display), 1, GrabModeAsync, GrabModeAsync);
+}
+
+bool EventFilter::nativeEventFilter(const QByteArray &eventType, void *message, long *)
+{
+    if (eventType == "xcb_generic_event_t")
+    {
+        xcb_generic_event_t* xcbevent = static_cast<xcb_generic_event_t *>(message);
+
+        switch(xcbevent->response_type)
+        {
+        case XCB_KEY_PRESS:
+            xcb_key_press_event_t * keypress_event = static_cast<xcb_key_press_event_t *>(message);
+            if(keypress_event->detail == keycodePrevious)
+            {
+                qobject_cast<MainWindow*>(target->topLevelWidget())->previous();
+            }
+            if(keypress_event->detail == keycodeNext)
+            {
+                qobject_cast<MainWindow*>(target->topLevelWidget())->next();
+            }
+        }
+    }
+    return false;
+}

src/eventfilter.h

@@ -0,0 +1,18 @@
+#ifndef EVENTFILTER_H
+#define EVENTFILTER_H
+
+#include <QAbstractNativeEventFilter>
+#include <QWidget>
+
+class EventFilter : public QAbstractNativeEventFilter
+{
+public:
+    void setup(QWidget *target);
+    bool nativeEventFilter(const QByteArray &eventType, void *message, long *result);
+private:
+    int keycodeNext;
+    int keycodePrevious;
+    QWidget * target;
+};
+
+#endif // EVENTFILTER_H

src/main.cpp

@@ -2,6 +2,7 @@
 #include "QObject"
 #include "QPushButton"
 #include "mainwindow.h"
+#include "eventfilter.h"
 #include <QApplication>
 
 int main(int argc, char *argv[]) {
@@ -29,6 +30,11 @@ int main(int argc, char *argv[]) {
     w.load(path);
   }
   w.show();
+
+  EventFilter filter;
+  a.installNativeEventFilter(&filter);
+  filter.setup(&w);
+
   a.setQuitOnLastWindowClosed(false);
   return a.exec();
 }