From 17cee03cd164c2a33d106f376479d967aaeb2437 Mon Sep 17 00:00:00 2001
From: cutealien <cutealien@dfc29bdd-3216-0410-991c-e03cc46cb475>
Date: Fri, 18 Dec 2009 12:37:25 +0000
Subject: [PATCH] ClearSystemMessages does now also just remove keyboard/mouse
 events on Linux. Should probably be parametrized in the long run.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3057 dfc29bdd-3216-0410-991c-e03cc46cb475
---
 include/IrrlichtDevice.h            |  4 ++--
 source/Irrlicht/CIrrDeviceLinux.cpp | 22 ++++++++++++++++++----
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/include/IrrlichtDevice.h b/include/IrrlichtDevice.h
index c2e0f093..5c003b5a 100644
--- a/include/IrrlichtDevice.h
+++ b/include/IrrlichtDevice.h
@@ -237,13 +237,13 @@ namespace irr
 		virtual bool getGammaRamp(f32 &red, f32 &green, f32 &blue,
 					f32 &brightness, f32 &contrast) =0;
 
-		//! Remove all messages pending in the system message loop
+		//! Remove messages pending in the system message loop
 		/** This function is usually used after messages have been buffered for a longer time, for example
 		when loading a large scene. Clearing the message loop prevents that mouse- or buttonclicks which users
 		have pressed in the meantime will now trigger unexpected actions in the gui. <br>
 		So far the following messages are cleared:<br>
 		Win32: All keyboard and mouse messages<br>
-		Linux: All messages<br>
+		Linux: All keyboard and mouse messages<br>
 		All other devices are not yet supported here.<br>
 		The function is still somewhat experimental, as the kind of messages we clear is based on just a few use-cases.
 		If you think further messages should be cleared, or some messages should not be cleared here, then please tell us. */
diff --git a/source/Irrlicht/CIrrDeviceLinux.cpp b/source/Irrlicht/CIrrDeviceLinux.cpp
index bf3b68f5..e1801a93 100644
--- a/source/Irrlicht/CIrrDeviceLinux.cpp
+++ b/source/Irrlicht/CIrrDeviceLinux.cpp
@@ -1814,6 +1814,19 @@ void CIrrDeviceLinux::copyToClipboard(const c8* text) const
 #endif
 }
 
+#ifdef _IRR_COMPILE_WITH_X11_
+// return true if the passed event has the type passed in parameter arg
+Bool PredicateIsEventType(Display *display, XEvent *event, XPointer arg)
+{
+	if ( event && event->type == (int)arg )
+	{
+//		os::Printer::log("remove event:", core::stringc((int)arg).c_str(), ELL_INFORMATION);
+		return True;
+	}
+	return False;
+}
+#endif //_IRR_COMPILE_WITH_X11_
+
 //! Remove all messages pending in the system message loop
 void CIrrDeviceLinux::clearSystemMessages()
 {
@@ -1821,10 +1834,11 @@ void CIrrDeviceLinux::clearSystemMessages()
 	if (CreationParams.DriverType != video::EDT_NULL)
 	{
 		XEvent event;
-		while (XPending(display) > 0 )
-		{
-			XNextEvent(display, &event);
-		}
+		while ( XCheckIfEvent(display, &event, PredicateIsEventType, (XPointer)ButtonPress) == True ) 	{}
+		while ( XCheckIfEvent(display, &event, PredicateIsEventType, (XPointer)ButtonRelease) == True ) {}
+		while ( XCheckIfEvent(display, &event, PredicateIsEventType, (XPointer)MotionNotify) == True ) 	{}
+		while ( XCheckIfEvent(display, &event, PredicateIsEventType, (XPointer)KeyRelease) == True )	{}
+		while ( XCheckIfEvent(display, &event, PredicateIsEventType, (XPointer)KeyPress) == True )		{}
 	}
 #endif //_IRR_COMPILE_WITH_X11_
 }