From 52fee3556e63859f3ba52609e8f025a491767a81 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Tue, 7 Apr 2015 12:59:41 +0200
Subject: [PATCH] Fix external middle-mouse pasting with Qt5/X11.
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Closes #9216. Patch by Jürgen and me.
---
 src/frontends/qt4/GuiApplication.cpp | 50 ++++++++++++++++++++++++++--
 src/frontends/qt4/GuiApplication.h   |  9 ++++-
 2 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/src/frontends/qt4/GuiApplication.cpp b/src/frontends/qt4/GuiApplication.cpp
index 9ddb87c8c5..ee2ecbcb8b 100644
--- a/src/frontends/qt4/GuiApplication.cpp
+++ b/src/frontends/qt4/GuiApplication.cpp
@@ -115,12 +115,16 @@
 #include <QThreadPool>
 #include <QWidget>
 
-// FIXME QT5
 #ifdef Q_WS_X11
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #undef CursorShape
 #undef None
+#elif defined(QPA_XCB)
+#include <xcb/xcb.h>
+#include <X11/Xatom.h>
+#include <X11/Intrinsic.h>
+#undef None
 #endif
 
 #if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
@@ -998,6 +1002,11 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
 	// Install translator for GUI elements.
 	installTranslator(&d->qt_trans_);
 
+#ifdef QPA_XCB
+	// Enable reception of XCB events.
+	installNativeEventFilter(this);
+#endif
+
 	// FIXME: quitOnLastWindowClosed is true by default. We should have a
 	// lyxrc setting for this in order to let the application stay resident.
 	// But then we need some kind of dock icon, at least on Windows.
@@ -2986,7 +2995,6 @@ bool GuiApplication::longOperationStarted() {
 //
 // X11 specific stuff goes here...
 
-// FIXME QT5
 #ifdef Q_WS_X11
 bool GuiApplication::x11EventFilter(XEvent * xev)
 {
@@ -3018,6 +3026,44 @@ bool GuiApplication::x11EventFilter(XEvent * xev)
 	}
 	return false;
 }
+#elif defined(QPA_XCB)
+bool GuiApplication::nativeEventFilter(const QByteArray & eventType,
+				       void * message, long *) Q_DECL_OVERRIDE
+{
+	if (!current_view_ || eventType != "xcb_generic_event_t")
+		return false;
+
+	xcb_generic_event_t * ev = static_cast<xcb_generic_event_t *>(message);
+
+	switch (ev->response_type) {
+	case XCB_SELECTION_REQUEST: {
+		xcb_selection_request_event_t * srev =
+			reinterpret_cast<xcb_selection_request_event_t *>(ev);
+		if (srev->selection != XA_PRIMARY)
+			break;
+		LYXERR(Debug::SELECTION, "X requested selection.");
+		BufferView * bv = current_view_->currentBufferView();
+		if (bv) {
+			docstring const sel = bv->requestSelection();
+			if (!sel.empty())
+				d->selection_.put(sel);
+		}
+		break;
+	}
+	case XCB_SELECTION_CLEAR: {
+		xcb_selection_clear_event_t * scev =
+			reinterpret_cast<xcb_selection_clear_event_t *>(ev);
+		if (scev->selection != XA_PRIMARY)
+			break;
+		LYXERR(Debug::SELECTION, "Lost selection.");
+		BufferView * bv = current_view_->currentBufferView();
+		if (bv)
+			bv->clearSelection();
+		break;
+	}
+	}
+	return false;
+}
 #endif
 
 } // namespace frontend
diff --git a/src/frontends/qt4/GuiApplication.h b/src/frontends/qt4/GuiApplication.h
index 6bf457e00f..c6258eaeb6 100644
--- a/src/frontends/qt4/GuiApplication.h
+++ b/src/frontends/qt4/GuiApplication.h
@@ -18,6 +18,9 @@
 
 #include <QApplication>
 #include <QList>
+#ifdef QPA_XCB
+#include <QAbstractNativeEventFilter>
+#endif
 
 class QAbstractItemModel;
 class QIcon;
@@ -47,6 +50,9 @@ There should be only one instance of this class. No Qt object
 initialisation should be done before the instantiation of this class.
 */
 class GuiApplication : public QApplication, public Application
+#ifdef QPA_XCB
+		     , public QAbstractNativeEventFilter
+#endif
 {
 	Q_OBJECT
 
@@ -99,9 +105,10 @@ public:
 	//@{
 	bool notify(QObject * receiver, QEvent * event);
 	void commitData(QSessionManager & sm);
-	// FIXME QT5
 #ifdef Q_WS_X11
 	bool x11EventFilter(XEvent * ev);
+#elif defined(QPA_XCB)
+	virtual bool nativeEventFilter(const QByteArray & eventType, void * message, long * result);
 #endif
 	//@}