/
KeyPreviewImpl.cpp
83 lines (78 loc) · 1.62 KB
/
KeyPreviewImpl.cpp
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#include "KeyPreviewImpl.h"
#include <QKeyEvent>
#include <assert.h>
KeyPreviewEventFilter::KeyPreviewEventFilter(KeyPreviewImpl *previewer) :
previewer_(previewer)
{
assert(previewer_);
}
bool KeyPreviewEventFilter::eventFilter(QObject *obj, QEvent *event)
{
assert(obj->isWidgetType());
//
switch(event->type())
{
case QEvent::KeyPress:
{
QKeyEvent *ke = static_cast<QKeyEvent*>(event);
if(previewer_->keyPreview(ke->key(), ke->modifiers(), true))
{
event->ignore();
return true;
}
}
break;
case QEvent::KeyRelease:
{
QKeyEvent *ke = static_cast<QKeyEvent*>(event);
if(previewer_->keyPreview(ke->key(), ke->modifiers(), false))
{
event->ignore();
return true;
}
}
break;
default:
break;
}
//
return false;
}
KeyPreviewImpl::KeyPreviewImpl() :
enabled_(false), filter_(this)
{
}
void KeyPreviewImpl::enableKeyPreview()
{
if(enabled_) return;
//
QObject *obj = dynamic_cast<QObject*>(this);
//
QObjectList chlist = obj->children();
foreach(QObject *child, chlist)
{
if(child->isWidgetType())
{
child->installEventFilter(&filter_);
}
}
//
enabled_ = true;
}
void KeyPreviewImpl::disableKeyPreview()
{
if(!enabled_) return;
//
QObject *obj = dynamic_cast<QObject*>(this);
//
QObjectList chlist = obj->children();
foreach(QObject *child, chlist)
{
if(child->isWidgetType())
{
child->removeEventFilter(&filter_);
}
}
//
enabled_ = false;
}