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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/View/Base/CustomEventFilters.cpp
//! @brief Defines classes releted to event filtering.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "GUI/View/Base/CustomEventFilters.h"
#include "Base/Util/Assert.h"
#include <QApplication>
#include <QComboBox>
#include <QKeyEvent>
#include <QString>
#include <utility>
SpaceKeyEater::SpaceKeyEater(QObject* parent)
: QObject(parent)
{
}
bool SpaceKeyEater::eventFilter(QObject* obj, QEvent* event)
{
if (event->type() != QEvent::KeyPress)
return QObject::eventFilter(obj, event);
auto* keyEvent = dynamic_cast<QKeyEvent*>(event);
if (keyEvent->key() == Qt::Key_Space)
return true; /* Always accept space bar */
return QObject::eventFilter(obj, event);
// standard event processing
}
// ----------------------------------------------------------------------------
WheelEventEater::WheelEventEater(QObject* parent)
: QObject(parent)
{
}
void WheelEventEater::install(QObject* obj)
{
auto* p = new WheelEventEater(obj);
obj->installEventFilter(p);
}
bool WheelEventEater::eventFilter(QObject* obj, QEvent* event)
{
if (auto* spinBox = qobject_cast<QAbstractSpinBox*>(obj)) {
if (event->type() == QEvent::Wheel) {
if (spinBox->focusPolicy() == Qt::WheelFocus) {
event->accept();
return false;
}
event->ignore();
return true;
}
if (event->type() == QEvent::FocusIn)
spinBox->setFocusPolicy(Qt::WheelFocus);
else if (event->type() == QEvent::FocusOut)
spinBox->setFocusPolicy(Qt::StrongFocus);
} else if (qobject_cast<QComboBox*>(obj)) {
if (event->type() == QEvent::Wheel) {
event->ignore();
return true;
}
event->accept();
return false;
}
return QObject::eventFilter(obj, event);
}
// ----------------------------------------------------------------------------
bool DeleteEventFilter::eventFilter(QObject* dist, QEvent* event)
{
Q_UNUSED(dist);
if (event->type() == QEvent::KeyPress) {
auto* keyEvent = dynamic_cast<QKeyEvent*>(event);
ASSERT(keyEvent);
if (keyEvent->key() == Qt::Key_Delete)
emit removeItem();
}
return QObject::eventFilter(dist, event);
}
// ----------------------------------------------------------------------------
LostFocusFilter::LostFocusFilter(QObject* parent)
: QObject(parent)
{
}
bool LostFocusFilter::eventFilter(QObject* obj, QEvent* event)
{
if (event->type() == QEvent::FocusOut)
return true;
return QObject::eventFilter(obj, event);
}
// ----------------------------------------------------------------------------
ShortcodeFilter::ShortcodeFilter(const QString& shortcode, QObject* parent)
: QObject(parent)
, m_shortcode(shortcode)
, m_index(0)
{
}
bool ShortcodeFilter::eventFilter(QObject* obj, QEvent* event)
{
Q_UNUSED(obj);
if (event->type() == QEvent::KeyPress) {
auto* keyEvent = dynamic_cast<QKeyEvent*>(event);
ASSERT(keyEvent);
if (m_shortcode.at(m_index) == keyEvent->text()) {
m_index++;
if (m_index == m_shortcode.length()) {
emit found();
m_index = 0;
}
} else {
int right = m_index;
while (m_index > 0) {
if (m_shortcode.at(m_index - 1) == keyEvent->text()
&& m_shortcode.left(m_index - 1)
== m_shortcode.mid(right - m_index + 1, m_index - 1))
break;
m_index--;
}
}
}
return false;
}
RightMouseButtonEater::RightMouseButtonEater(QObject* parent)
: QObject(parent)
{
}
bool RightMouseButtonEater::eventFilter(QObject* obj, QEvent* event)
{
if (event->type() != QEvent::MouseButtonPress)
// standard event processing
return QObject::eventFilter(obj, event);
auto* mouseEvent = dynamic_cast<QMouseEvent*>(event);
ASSERT(mouseEvent);
if (mouseEvent->button() == Qt::RightButton) {
event->ignore();
return true;
}
event->accept();
return false;
}
//! Passing focus-related events from child widget (e.g. QSpinBox) to parent (e.g. IntEditor)
//! to trigger QTreeView delegate's mechanism to switch editors on "tab" press key.
//! https://stackoverflow.com/questions/12145522/why-pressing-of-tab-key-emits-only-qeventshortcutoverride-event
TabFromFocusProxy::TabFromFocusProxy(QWidget* parent)
: QObject(parent)
, m_parent(parent)
{
if (parent->focusProxy())
parent->focusProxy()->installEventFilter(this);
}
bool TabFromFocusProxy::eventFilter(QObject* obj, QEvent* event)
{
if (event->type() == QEvent::KeyPress) {
auto* keyEvent = dynamic_cast<QKeyEvent*>(event);
ASSERT(keyEvent);
if (keyEvent->key() == Qt::Key_Tab || keyEvent->key() == Qt::Key_Backtab) {
// we are posting event as if m_parent had "tab" key
QApplication::postEvent(
m_parent, new QKeyEvent(keyEvent->type(), keyEvent->key(), keyEvent->modifiers()));
return false; // let QSpinBox that triggered the event process it
}
}
else if (event->type() == QEvent::FocusOut) {
auto* focusEvent = dynamic_cast<QFocusEvent*>(event);
ASSERT(focusEvent);
QApplication::postEvent(this, new QFocusEvent(focusEvent->type(), focusEvent->reason()));
return false; // Don't filter because focus can be changed internally in editor
}
return QObject::eventFilter(obj, event);
}
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