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Gestures: fix running on win XP

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Potential fix, by dynamically linking SetGestureConfig
This commit is contained in:
DeepSOIC
2015-04-04 01:30:01 +03:00
parent fb753b24b1
commit 571b7ded02
3 changed files with 62 additions and 24 deletions
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27
src/Gui/WinNativeGestureRecognizers.cpp
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@@ -41,6 +41,7 @@
#include <qgesture.h>
#include <private/qevent_p.h>
#include <Base/Exception.h>
QT_BEGIN_NAMESPACE
@@ -188,10 +189,28 @@ void WinNativeGestureRecognizerPinch::reset(QGesture* gesture)
q->fingerDistance = 0;
}
//function prototype for dymanic linking
typedef BOOL ( __stdcall * ptrSetGestureConfig) (
HWND , // window for which configuration is specified
DWORD , // reserved, must be 0
UINT , // count of GESTURECONFIG structures
PGESTURECONFIG , // array of GESTURECONFIG structures, dwIDs will be processed in the
// order specified and repeated occurances will overwrite previous ones
UINT ); // sizeof(GESTURECONFIG)
void WinNativeGestureRecognizerPinch::TuneWindowsGestures(QWidget* target)
{
//modify windows-specific gesture options
#if WINVER >= _WIN32_WINNT_WIN7
//dynamic linking - required to be able to run on windows pre-7
HINSTANCE hinstLib = LoadLibraryA("user32.dll");
if (hinstLib == 0)
throw Base::Exception("LoadLibrary(user32.dll) failed. Could not tune Windows gestures.");
ptrSetGestureConfig dllSetGestureConfig = reinterpret_cast<ptrSetGestureConfig> (GetProcAddress(hinstLib,"SetGestureConfig"));
if (dllSetGestureConfig == 0)
throw Base::Exception("DLL entry point for SetGestureConfig not found in user32.dll. Could not tune Windows gestures.");
HWND w = target->winId();
//fill in the options
@@ -205,10 +224,12 @@ void WinNativeGestureRecognizerPinch::TuneWindowsGestures(QWidget* target)
cfgs[1].dwWant = GC_ROTATE;
//set the options
bool ret = SetGestureConfig(w, 0, nCfg, cfgs, sizeof(GESTURECONFIG));
assert(ret); //if(!ret) throw
bool ret = dllSetGestureConfig(w, 0, nCfg, cfgs, sizeof(GESTURECONFIG));
assert(ret);
if(!ret){
DWORD err = GetLastError();//for debugging
DWORD err = GetLastError();
QString errMsg = QString::fromLatin1("Error in SetGestureConfig. GetLastError = %1").arg(err);
throw Base::Exception(errMsg.toLatin1());
}
#endif
}