From 10a5b70b0af167c1f154a4c9dbe8829fe966fffa Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Wed, 27 Mar 2019 19:07:08 -0700
Subject: GLK: FROTZ: Handle creating Glk window when switching to/from fixed
 width styles

---
 engines/glk/frotz/windows.cpp | 22 ++++++++++++++++------
 engines/glk/frotz/windows.h   |  7 ++++---
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/engines/glk/frotz/windows.cpp b/engines/glk/frotz/windows.cpp
index 8ebc263151..0619030567 100644
--- a/engines/glk/frotz/windows.cpp
+++ b/engines/glk/frotz/windows.cpp
@@ -23,6 +23,7 @@
 #include "glk/frotz/windows.h"
 #include "glk/frotz/frotz.h"
 #include "glk/window_pair.h"
+#include "glk/window_text_grid.h"
 #include "glk/window_text_buffer.h"
 #include "glk/conf.h"
 
@@ -143,6 +144,11 @@ void Window::setPosition(const Point &newPos) {
 void Window::setCursor(const Point &newPos) {
 	int x = newPos.x, y = newPos.y;
 
+	if (!(_currStyle & FIXED_WIDTH_STYLE)) {
+		_currStyle |= FIXED_WIDTH_STYLE;
+		ensureGlkWindow();
+	}
+
 	if (y < 0) {
 		// Cursor on/off
 		if (y == -2)
@@ -226,10 +232,10 @@ uint Window::setFont(uint font) {
 	return result;
 }
 
-void Window::setStyle(int style) {
+void Window::setStyle(uint style) {
 	if (style == 0)
 		_currStyle = 0;
-	else if (style != -1)
+	else if (style != 0xf000)
 		// not tickle time
 		_currStyle |= style;
 
@@ -247,8 +253,7 @@ void Window::setStyle(int style) {
 void Window::updateStyle() {
 	uint style = _currStyle;
 
-	if (!_win)
-		createGlkWindow();
+	ensureGlkWindow();
 
 	if (style & REVERSE_STYLE)
 		setReverseVideo(true);
@@ -289,9 +294,14 @@ void Window::setReverseVideo(bool reverse) {
 	_win->_stream->setReverseVideo(reverse);
 }
 
-void Window::createGlkWindow() {
+void Window::ensureGlkWindow() {
 	// Create a new window	
-	if (_index == 1) {
+	if (_win && (dynamic_cast<TextGridWindow *>(_win) != nullptr) != ((_currStyle & FIXED_WIDTH_STYLE) != 0)) {
+		g_vm->glk_window_close(_win);
+		_win = nullptr;
+	}
+
+	if (_currStyle & FIXED_WIDTH_STYLE) {
 		// Text grid window
 		_win = g_vm->glk_window_open(g_vm->glk_window_get_root(),
 			winmethod_Arbitrary | winmethod_Fixed, 0, wintype_TextGrid, 0);
diff --git a/engines/glk/frotz/windows.h b/engines/glk/frotz/windows.h
index fe59cc7e00..f12d9eec20 100644
--- a/engines/glk/frotz/windows.h
+++ b/engines/glk/frotz/windows.h
@@ -102,9 +102,10 @@ private:
 	void update();
 
 	/**
-	 * Creates a new Glk window to attach to the window
+	 * Creates a new Glk window to attach to the window if not already present, or recreates the window
+	 * if the font style has changed to/from fixed width
 	 */
-	void createGlkWindow();
+	void ensureGlkWindow();
 
 	/**
 	 * Updates the current font/style
@@ -191,7 +192,7 @@ public:
 	/**
 	 * Set the textstyle
 	 */
-	void setStyle(int style = -1);
+	void setStyle(uint style = 0xf000);
 
 	/**
 	 * Set reverse video
-- 
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