init

Telegram/lib_base/base/qt/qt_tab_key.cpp

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#include "base/qt/qt_tab_key.h"
+
+#include "base/event_filter.h"
+
+#include <QApplication>
+#include <QKeyEvent>
+#include <QWidget>
+
+namespace base {
+
+bool FocusNextPrevChildBlocked(not_null<QWidget*> widget, bool next) {
+	const auto skip = [&](QWidget *w) {
+		return next ? w->nextInFocusChain() : w->previousInFocusChain();
+	};
+	const auto focused = QApplication::focusWidget();
+	const auto start = focused ? focused : widget.get();
+	auto w = skip(start);
+	while (w && w != start) {
+		if ((w->focusPolicy() & Qt::TabFocus) && widget->isAncestorOf(w)) {
+			break;
+		}
+		w = skip(w);
+	}
+	if (w && w != start) {
+		w->setFocus(next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
+	}
+	return true;
+}
+
+void DisableTabKey(QWidget *widget) {
+	if (!widget) {
+		return;
+	}
+	install_event_filter(widget, [=](not_null<QEvent*> e) {
+		if (e->type() == QEvent::KeyPress) {
+			const auto key = static_cast<QKeyEvent*>(e.get())->key();
+			if ((key == Qt::Key_Tab) || (key == Qt::Key_Backtab)) {
+				return base::EventFilterResult::Cancel;
+			}
+		}
+		return base::EventFilterResult::Continue;
+	});
+}
+
+} // namespace base