X-Git-Url: http://git.tdb.fi/?p=libs%2Fgui.git;a=blobdiff_plain;f=source%2Finput%2Fwindows%2Ftouchscreen.cpp;h=7e314ca98d39f99ab4eb2cdbc5d1942292ae7d08;hp=180f1c04f568816bb9fc8de1ce7ed383c156173e;hb=49e19af2c599e7316b5a01983adc040421429f86;hpb=917222bae696465f99024e0e15f73ba1058add44

diff --git a/source/input/windows/touchscreen.cpp b/source/input/windows/touchscreen.cpp
index 180f1c0..7e314ca 100644
--- a/source/input/windows/touchscreen.cpp
+++ b/source/input/windows/touchscreen.cpp
@@ -8,6 +8,28 @@ using namespace std;
 namespace Msp {
 namespace Input {
 
+bool Touchscreen::is_available()
+{
+	// Must have at least Windows 7 (WinNT 6.1) for WM_TOUCHMOVE
+	OSVERSIONINFOEX version;
+	version.dwOSVersionInfoSize = sizeof(version);
+	version.dwMajorVersion = 6;
+	version.dwMinorVersion = 1;
+	version.dwServicePackMajor = 0;
+	version.dwServicePackMinor = 0;
+	DWORD mask = VER_MAJORVERSION|VER_MINORVERSION|VER_SERVICEPACKMAJOR|VER_SERVICEPACKMINOR;
+	DWORDLONG cond = VerSetConditionMask(0, mask, VER_GREATER_EQUAL);
+	if(!VerifyVersionInfo(&version, type, cond))
+		return false;
+
+	if(!GetSystemMetrics(SM_TABLETPC))
+		return false;
+	if(!(GetSystemMetrics(SM_DIGITIZER)&NID_READY))
+		return false;
+
+	return true;
+}
+
 void Touchscreen::input_event(const Graphics::Window::Event &event)
 {
 	if(event.msg==WM_TOUCHMOVE)