Add Ui::AppInFocus() method.

ui/layers/layer_widget.cpp

@@ -462,10 +462,10 @@ void LayerStackWidget::setCacheImages() {
 
 void LayerStackWidget::closeLayer(not_null<LayerWidget*> layer) {
 	const auto weak = Ui::MakeWeak(layer.get());
-	if (weak->inFocusChain()) {
+	if (Ui::InFocusChain(layer)) {
 		setFocus();
 	}
-	if (!weak || !weak->setClosing()) {
+	if (!layer->setClosing()) {
 		// This layer is already closing.
 		return;
 	} else if (!weak) {
@@ -734,9 +734,11 @@ void LayerStackWidget::appendBox(
 LayerWidget *LayerStackWidget::pushBox(
 		object_ptr<BoxContent> box,
 		anim::type animated) {
-	auto oldLayer = currentLayer();
+	const auto oldLayer = currentLayer();
 	if (oldLayer) {
-		if (oldLayer->inFocusChain()) setFocus();
+		if (Ui::InFocusChain(oldLayer)) {
+			setFocus();
+		}
 		oldLayer->hide();
 	}
 	_layers.push_back(
@@ -793,7 +795,7 @@ void LayerStackWidget::clearClosingLayers() {
 	while (!_closingLayers.empty()) {
 		const auto index = _closingLayers.size() - 1;
 		const auto layer = _closingLayers.back().get();
-		if (layer->inFocusChain()) {
+		if (Ui::InFocusChain(layer)) {
 			setFocus();
 		}
 

ui/rp_widget.h

@@ -28,10 +28,6 @@ public:
 		return QMargins();
 	}
 
-	bool inFocusChain() const {
-		return Ui::InFocusChain(this);
-	}
-
 	void hideChildren() {
 		for (auto child : Base::children()) {
 			if (child->isWidgetType()) {

ui/ui_utility.cpp

@@ -8,8 +8,8 @@
 
 #include "ui/style/style_core.h"
 
+#include <QtWidgets/QApplication>
 #include <QtGui/QWindow>
-#include <QtGui/QGuiApplication>
 #include <QtGui/QtEvents>
 
 #include <array>
@@ -82,6 +82,10 @@ void SendPendingEventsRecursive(QWidget *target, bool parentHiddenFlag) {
 
 } // namespace
 
+bool AppInFocus() {
+	return QApplication::focusWidget() != nullptr;
+}
+
 void SendPendingMoveResizeEvents(not_null<QWidget*> target) {
 	CreateWidgetStateRecursive(target);
 	SendPendingEventsRecursive(target, !target->isVisible());

ui/ui_utility.h

@@ -98,6 +98,8 @@ inline not_null<std::decay_t<Value>*> AttachAsChild(
 		std::forward<Value>(value))->value();
 }
 
+[[nodiscard]] bool AppInFocus();
+
 [[nodiscard]] inline bool InFocusChain(not_null<const QWidget*> widget) {
 	if (const auto top = widget->window()) {
 		if (auto focused = top->focusWidget()) {