Mega Code Archive
Event filters
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#ifndef FILTEROBJECT_H
#define FILTEROBJECT_H
#include <QObject>
class FilterObject : public QObject
{
Q_OBJECT
public:
FilterObject(QObject *parent = 0);
bool eventFilter(QObject *object, QEvent *event);
void setFilteredObject(QObject *object);
private:
QObject *target;
};
#endif
#include <QtGui>
#include "filterobject.h"
FilterObject::FilterObject(QObject *parent)
: QObject(parent), target(0)
{
}
bool FilterObject::eventFilter(QObject *object, QEvent *event)
{
if (object == target && event->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
if (keyEvent->key() == Qt::Key_Tab) {
// Special tab handling
return true;
} else
return false;
}
return false;
}
void FilterObject::setFilteredObject(QObject *object)
{
if (target)
target->removeEventFilter(this);
target = object;
if (target)
target->installEventFilter(this);
}
#include <QApplication>
#include <QTextEdit>
#include "filterobject.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QTextEdit editor;
FilterObject filter;
filter.setFilteredObject(&editor);
editor.show();
return app.exec();
}
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