Added the GTK3 InputStyle abstraction and updated input style/chanview declarations to avoid direct GtkStyle usage in GTK3 builds.

Updated input style initialization and kept GTK2-only RC parsing while applying GTK3 palette styling for the channel tree via CSS-aware paths.

src/fe-gtk/chanview-tree.c

@@ -118,9 +118,14 @@ cv_tree_init (chanview *cv)
 	gtk_widget_set_name (view, "zoitechat-tree");
 	if (cv->style)
 	{
+#if HAVE_GTK3
+		gtkutil_apply_palette (view, &colors[COL_BG], &colors[COL_FG],
+		                       cv->style->font_desc);
+#else
 		gtkutil_apply_palette (view, &cv->style->base[GTK_STATE_NORMAL],
 		                       &cv->style->text[GTK_STATE_NORMAL],
 		                       cv->style->font_desc);
+#endif
 	}
 	/*gtk_widget_modify_base (view, GTK_STATE_NORMAL, &colors[COL_BG]);*/
 	gtk_widget_set_can_focus (view, FALSE);

src/fe-gtk/chanview.c

@@ -45,7 +45,7 @@ struct _chanview
 	int size;			/* number of channels in view */
 
 	GtkWidget *box;	/* the box we destroy when changing implementations */
-	GtkStyle *style;	/* style used for tree */
+	InputStyle *style;	/* style used for tree */
 	chan *focused;		/* currently focused channel */
 	int trunc_len;
 
@@ -292,7 +292,7 @@ chanview_box_destroy_cb (GtkWidget *box, chanview *cv)
 
 chanview *
 chanview_new (int type, int trunc_len, gboolean sort, gboolean use_icons,
-				  GtkStyle *style)
+				  InputStyle *style)
 {
 	chanview *cv;
 

src/fe-gtk/chanview.h

@@ -20,10 +20,12 @@
 #ifndef ZOITECHAT_CHANVIEW_H
 #define ZOITECHAT_CHANVIEW_H
 
+#include "fe-gtk.h"
+
 typedef struct _chanview chanview;
 typedef struct _chan chan;
 
-chanview *chanview_new (int type, int trunc_len, gboolean sort, gboolean use_icons, GtkStyle *style);
+chanview *chanview_new (int type, int trunc_len, gboolean sort, gboolean use_icons, InputStyle *style);
 void chanview_set_callbacks (chanview *cv,
 	void (*cb_focus) (chanview *, chan *, int tag, void *userdata),
 	void (*cb_xbutton) (chanview *, chan *, int tag, void *userdata),

src/fe-gtk/fe-gtk.c

@@ -250,6 +250,7 @@ fe_args (int argc, char *argv[])
 	return -1;
 }
 
+#if !HAVE_GTK3
 const char cursor_color_rc[] =
 	"style \"xc-ib-st\""
 	"{"
@@ -272,6 +273,7 @@ static const char adwaita_workaround_rc[] =
 		"}"
 	"}"
 	"widget \"*.zoitechat-inputbox\" style \"zoitechat-input-workaround\"";
+#endif
 
 static gboolean
 fe_system_prefers_dark (void)
@@ -397,13 +399,19 @@ fe_dark_mode_is_enabled (void)
 	return fe_dark_mode_is_enabled_for (prefs.hex_gui_dark_mode);
 }
 
-GtkStyle *
+InputStyle *
-create_input_style (GtkStyle *style)
+create_input_style (InputStyle *style)
 {
 	char buf[256];
 	static int done_rc = FALSE;
 
-	pango_font_description_free (style->font_desc);
+#if HAVE_GTK3
+	if (!style)
+		style = g_new0 (InputStyle, 1);
+#endif
+
+	if (style->font_desc)
+		pango_font_description_free (style->font_desc);
 	style->font_desc = pango_font_description_from_string (prefs.hex_text_font);
 
 	/* fall back */
@@ -417,6 +425,7 @@ create_input_style (GtkStyle *style)
 
 	if (prefs.hex_gui_input_style && !done_rc)
 	{
+#if !HAVE_GTK3
 		GtkSettings *settings = gtk_settings_get_default ();
 		char *theme_name;
 
@@ -427,7 +436,6 @@ create_input_style (GtkStyle *style)
 			gtk_rc_parse_string (adwaita_workaround_rc);
 		g_free (theme_name);
 
-		done_rc = TRUE;
 		{
 			guint16 red;
 			guint16 green;
@@ -437,11 +445,15 @@ create_input_style (GtkStyle *style)
 			sprintf (buf, cursor_color_rc, (red >> 8), (green >> 8), (blue >> 8));
 		}
 		gtk_rc_parse_string (buf);
+#endif
+		done_rc = TRUE;
 	}
 
+#if !HAVE_GTK3
 	style->bg[GTK_STATE_NORMAL] = colors[COL_FG];
 	style->base[GTK_STATE_NORMAL] = colors[COL_BG];
 	style->text[GTK_STATE_NORMAL] = colors[COL_FG];
+#endif
 
 	return style;
 }
@@ -460,7 +472,11 @@ fe_init (void)
 	gtkosx_application_set_dock_icon_pixbuf (osx_app, pix_zoitechat);
 #endif
 	channelwin_pix = pixmap_load_from_file (prefs.hex_text_background);
+#if HAVE_GTK3
+	input_style = create_input_style (input_style);
+#else
 	input_style = create_input_style (gtk_style_new ());
+#endif
 
 	settings = gtk_settings_get_default ();
 	if (settings)

src/fe-gtk/fe-gtk.h

@@ -48,6 +48,15 @@
 #define flag_b flag_wid[7]
 #define NUM_FLAG_WIDS 8
 
+#if HAVE_GTK3
+typedef struct _input_style
+{
+	PangoFontDescription *font_desc;
+} InputStyle;
+#else
+typedef GtkStyle InputStyle;
+#endif
+
 #ifdef HAVE_GTK_MAC
 extern GtkosxApplication *osx_app;
 #endif

src/fe-gtk/maingui.c

@@ -272,7 +272,7 @@ static const char chan_flags[] = { 'c', 'n', 't', 'i', 'm', 'l', 'k' };
 static chan *active_tab = NULL; /* active tab */
 GtkWidget *parent_window = NULL;                        /* the master window */
 
-GtkStyle *input_style;
+InputStyle *input_style;
 
 static PangoAttrList *away_list;
 static PangoAttrList *newdata_list;

src/fe-gtk/maingui.h

@@ -20,7 +20,7 @@
 #ifndef ZOITECHAT_MAINGUI_H
 #define ZOITECHAT_MAINGUI_H
 
-extern GtkStyle *input_style;
+extern InputStyle *input_style;
 extern GtkWidget *parent_window;
 
 void mg_changui_new (session *sess, restore_gui *res, int tab, int focus);

src/fe-gtk/setup.c

@@ -48,7 +48,7 @@
 #endif
 #include "sexy-spell-entry.h"
 
-GtkStyle *create_input_style (GtkStyle *);
+InputStyle *create_input_style (InputStyle *);
 
 #define LABEL_INDENT 12
 
@@ -2860,7 +2860,7 @@ setup_apply_to_sess (session_gui *gui)
 
         if (prefs.hex_gui_input_style)
         {
-#if GTK_CHECK_VERSION(3,0,0)
+#if HAVE_GTK3
                 char buf[128];
                 GtkCssProvider *provider = gtk_css_provider_new ();
                 GtkStyleContext *context;