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New utility class QgsTemporaryCursorRestoreOverride

This class temporarily removes ALL cursor overrides for the
QApplication for the lifetime of the object, and restores them
(in the same order) upon object destruction.
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nyalldawson committed Mar 12, 2019
1 parent 6bb0723 commit 5fb980222976ebd5ea58847a743b65a011be8ffb
Showing with 59 additions and 0 deletions.
  1. +28 −0 src/gui/qgsguiutils.cpp
  2. +31 −0 src/gui/qgsguiutils.h
@@ -272,3 +272,31 @@ void QgsTemporaryCursorOverride::release()
mHasOverride = false;
QApplication::restoreOverrideCursor();
}


//
// QgsTemporaryCursorRestoreOverride
//

QgsTemporaryCursorRestoreOverride::QgsTemporaryCursorRestoreOverride()
{
while ( QApplication::overrideCursor() )
{
mCursors.emplace_back( QCursor( *QApplication::overrideCursor() ) );
QApplication::restoreOverrideCursor();
}
}

QgsTemporaryCursorRestoreOverride::~QgsTemporaryCursorRestoreOverride()
{
restore();
}

void QgsTemporaryCursorRestoreOverride::restore()
{
for ( auto it = mCursors.rbegin(); it != mCursors.rend(); ++it )
{
QApplication::setOverrideCursor( *it );
}
mCursors.clear();
}
@@ -206,4 +206,35 @@ class GUI_EXPORT QgsTemporaryCursorOverride

};

/**
* Temporarily removes all cursor overrides for the QApplication for the lifetime of the object.
*
* When the object is deleted, all stacked cursor overrides are restored.
*
* \ingroup gui
* \since QGIS 3.8
*/
class GUI_EXPORT QgsTemporaryCursorRestoreOverride
{
public:

/**
* Constructor for QgsTemporaryCursorRestoreOverride. Removes all application override
* cursors.
*/
QgsTemporaryCursorRestoreOverride();

~QgsTemporaryCursorRestoreOverride();

/**
* Restores the cursor override early (i.e. before this object is destroyed).
*/
void restore();

private:

std::vector< QCursor > mCursors;

};

#endif // QGSGUIUTILS_H

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