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#include "EntryGridKeyUpDownEventFilter.h"
#include <QKeyEvent>
#include <QLineEdit>
#include <QWidget>
#include <algorithm>
#include <cassert>
#include <vector>
namespace ODbgRegisterView {
bool entry_grid_key_event_filter(QWidget *parent, QObject *obj, QEvent *event) {
auto entry = qobject_cast<QLineEdit *>(obj);
if (!entry || event->type() != QEvent::KeyPress) {
return false;
}
auto keyEvent = static_cast<QKeyEvent *>(event);
const auto key = keyEvent->key();
if (key != Qt::Key_Up && key != Qt::Key_Down)
return false;
// subtraction of 1 from x prevents selection of entry to the right-top/bottom instead directly top/bottom
const auto pos = entry->pos() - QPoint(1, 0);
const auto children = parent->findChildren<QLineEdit *>();
// Find the neighbors above/below the current entry
std::vector<QLineEdit *> neighbors;
for (auto *const child : children) {
if (!child->isVisible())
continue;
if (key == Qt::Key_Up && child->y() >= pos.y())
continue;
if (key == Qt::Key_Down && child->y() <= pos.y())
continue;
neighbors.emplace_back(child);
}
if (neighbors.empty()) {
return false;
}
// Bring the vertically closest neighbors to the front
const auto y = pos.y();
std::sort(neighbors.begin(), neighbors.end(), [y](QLineEdit *a, QLineEdit *b) {
return std::abs(y - a->y()) < std::abs(y - b->y());
});
// Remove those too far vertically, so that they don't interfere with later calculations
const auto verticallyClosestY = neighbors.front()->y();
neighbors.erase(std::remove_if(neighbors.begin(), neighbors.end(), [verticallyClosestY](QLineEdit *e) {
return e->y() != verticallyClosestY;
}),
neighbors.end());
assert(!neighbors.empty());
const auto x = pos.x();
const auto bestNeighbor = *std::min_element(neighbors.begin(), neighbors.end(), [x](QLineEdit *a, QLineEdit *b) {
return std::abs(x - a->x()) < std::abs(x - b->x());
});
bestNeighbor->setFocus(Qt::TabFocusReason);
return true;
}
}
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