From 7df3792ae360f7d0ec5ea4a50b2b7b68c1e7ccda Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko <sev@scummvm.org>
Date: Sat, 1 Oct 2022 16:57:03 +0200
Subject: [PATCH] GUI: Implement drawing mode of top dialog only

---
 gui/gui-manager.cpp | 19 ++++++++++++++++---
 gui/gui-manager.h   |  4 ++++
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/gui/gui-manager.cpp b/gui/gui-manager.cpp
index 7073dabaeb4..57e4ebace04 100644
--- a/gui/gui-manager.cpp
+++ b/gui/gui-manager.cpp
@@ -78,6 +78,8 @@ GuiManager::GuiManager() : CommandSender(nullptr), _redrawStatus(kRedrawDisabled
 	_topDialogLeftPadding = 0;
 	_topDialogRightPadding = 0;
 
+	_displayTopDialogOnly = false;
+
 	// Clear the cursor
 	memset(_cursor, 0xFF, sizeof(_cursor));
 
@@ -343,6 +345,15 @@ void GuiManager::redrawFull() {
 	_system->updateScreen();
 }
 
+void GuiManager::displayTopDialogOnly(bool mode) {
+	if (mode == _displayTopDialogOnly)
+		return;
+
+	_displayTopDialogOnly = mode;
+
+	redrawFull();
+}
+
 void GuiManager::redraw() {
 	ThemeEngine::ShadingStyle shading;
 
@@ -369,9 +380,11 @@ void GuiManager::redraw() {
 			_theme->clearAll();
 			_theme->drawToBackbuffer();
 
-			for (DialogStack::size_type i = 0; i < _dialogStack.size() - 1; i++) {
-				_dialogStack[i]->drawDialog(kDrawLayerBackground);
-				_dialogStack[i]->drawDialog(kDrawLayerForeground);
+			if (!_displayTopDialogOnly) {
+				for (DialogStack::size_type i = 0; i < _dialogStack.size() - 1; i++) {
+					_dialogStack[i]->drawDialog(kDrawLayerBackground);
+					_dialogStack[i]->drawDialog(kDrawLayerForeground);
+				}
 			}
 
 			// fall through
diff --git a/gui/gui-manager.h b/gui/gui-manager.h
index 66df2f6acdb..8dfb46210ba 100644
--- a/gui/gui-manager.h
+++ b/gui/gui-manager.h
@@ -140,6 +140,8 @@ public:
 
 	void initIconsSet();
 
+	void displayTopDialogOnly(bool mode);
+
 protected:
 	enum RedrawStatus {
 		kRedrawDisabled = 0,
@@ -169,6 +171,8 @@ protected:
 	int			_topDialogLeftPadding;
 	int			_topDialogRightPadding;
 
+	bool		_displayTopDialogOnly;
+
 	Common::Mutex _iconsMutex;
 	Common::SearchSet _iconsSet;
 	bool _iconsSetChanged;