A simple gtksourceview example, I need to make it better, I know.

src/gtksourceview-example/.geanyprj

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+[project]
+name=gtksourceview-auto-completion
+description=A simple GtkSourceView class example.
+base_path=./
+run_cmd=./main
+regenerate=true
+type=C

src/gtksourceview-example/Makefile

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+PKG_CONFIG = `pkg-config --libs --cflags gtk+-3.0 gtksourceview-3.0`
+LIBS = gucodeviewer.c gucodeviewer.h
+LIB_OBJ = gucodeviewer.o
+MAIN = main.c
+CC = gcc
+MAIN_FLAGS = -o
+OBJ_FLAGS = -c
+
+all:
+	$(CC) $(LIBS) $(OBJ_FLAGS) $(PKG_CONFIG)
+	$(CC) $(MAIN) $(LIB_OBJ) $(MAIN_FLAGS) gucodeviewer $(PKG_CONFIG) 
+clean:
+	rm -rf gucodeviewer
+	rm -rf $(LIB_OBJ)

src/gtksourceview-example/gucodeviewer.c

@@ -0,0 +1,212 @@
+/*
+ * gucodeviewer.c
+ * 
+ * Copyright 2013 userx <userx@AdventChildren>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ * 
+ * 
+ */
+
+#include "gucodeviewer.h"
+
+#include <gtksourceview/gtksourceview.h>
+#include <gtksourceview/gtksourcebuffer.h>
+#include <gtksourceview/gtksourcelanguage.h>
+#include <gtksourceview/gtksourcelanguagemanager.h>
+
+/*  I decided to design it with the GtkBox to pack the widgets
+ * instead of GtkGrid or something like this, just becouse I wanted
+ * to make it simple and easy to understand for anyone and GtkGrid seems
+ * to be something more complicated, I don't know...anyway,
+ * be confortable to modify it as you want.
+ * 
+ * P.S.: Once again, sorry about my english.
+ */
+
+
+struct GuCodeViewerPrivate_
+{
+	GtkWidget * vbox;
+	GtkWidget * hbox;
+
+	GtkWidget * OpenButton;
+
+	GtkWidget * cButton;
+	GtkWidget * javaButton;
+	GtkWidget * pyButton;
+
+	GtkWidget * sView;
+	GtkSourceBuffer * sBuffer;
+	GtkSourceLanguage * lang;
+	GtkSourceLanguageManager * lm; // language manager ::
+
+	gpointer delete_me;
+};
+
+static void gu_code_viewer_finalize (GObject *object);
+
+G_DEFINE_TYPE (GuCodeViewer, gu_code_viewer, GTK_TYPE_WINDOW)
+
+// callbacks ::
+
+void
+gu_code_viewer_open_file (GtkWidget * widget,
+							gpointer user_data)
+{
+	GuCodeViewer * cViewer = GU_CODE_VIEWER (user_data);
+	GtkResponseType response;
+	GtkWidget * dialog;
+	dialog = gtk_file_chooser_dialog_new ("GU - Code Viewer open file diaog",
+											GTK_WINDOW(cViewer),
+											GTK_FILE_CHOOSER_ACTION_OPEN,
+											GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+											GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
+											NULL);
+
+	response = gtk_dialog_run (GTK_DIALOG (dialog));
+	if (response == GTK_RESPONSE_ACCEPT)
+	{
+		const gchar * filename;
+		gchar * file_content;
+		GError * error = NULL;
+		GuCodeViewerPrivate * priv = cViewer->priv;
+		filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER(dialog));
+
+		gboolean open = g_file_get_contents (filename, &file_content,
+											NULL, &error);
+		if (open == FALSE)
+		{
+			g_print("[WARNING] Error: %s\n", error->message);
+			error = NULL;
+
+		} else 
+		{
+
+			gtk_text_buffer_set_text (GTK_TEXT_BUFFER (priv->sBuffer), file_content, -1);
+
+
+		}
+
+	}
+
+	gtk_widget_destroy (dialog);
+
+}
+
+void
+gu_code_viewer_set_langhightlight (GtkWidget * widget, gpointer user_data)
+{
+	GuCodeViewerPrivate * priv = GU_CODE_VIEWER (user_data)->priv;
+	const gchar * mime_type = gtk_button_get_label (GTK_BUTTON(widget));	
+	priv->lang = gtk_source_language_manager_get_language (GTK_SOURCE_LANGUAGE_MANAGER(priv->lm), mime_type);
+
+	gtk_source_buffer_set_language (GTK_SOURCE_BUFFER (priv->sBuffer), priv->lang);
+}
+
+static void
+gu_code_viewer_class_init (GuCodeViewerClass *klass)
+{
+  GObjectClass *g_object_class;
+
+  g_object_class = G_OBJECT_CLASS (klass);
+
+  g_object_class->finalize = gu_code_viewer_finalize;
+
+  g_type_class_add_private ((gpointer)klass, sizeof (GuCodeViewerPrivate));
+}
+
+
+static void
+gu_code_viewer_finalize (GObject *object)
+{
+  GuCodeViewer *self;
+
+  g_return_if_fail (GU_IS_CODE_VIEWER (object));
+
+  self = GU_CODE_VIEWER (object);
+
+  G_OBJECT_CLASS (gu_code_viewer_parent_class)->finalize (object);
+}
+
+
+static void
+gu_code_viewer_init (GuCodeViewer *self)
+{
+	GtkWidget * scrolled;
+	GtkWidget * langButton;
+	GtkWidget * langLabel;
+
+	self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GU_TYPE_CODE_VIEWER, GuCodeViewerPrivate);
+	GuCodeViewerPrivate * priv = self->priv;
+
+	// box create ::
+	priv->vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+	priv->hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+
+	priv->OpenButton = gtk_button_new_from_stock (GTK_STOCK_OPEN);
+
+	priv->cButton = gtk_button_new_with_label ("c");
+	priv->javaButton = gtk_button_new_with_label ("java");
+	priv->pyButton = gtk_button_new_with_label ("python");
+
+	// window with horizontal and vertical scroll ::
+	scrolled = gtk_scrolled_window_new (NULL, NULL);
+	// automatic scrolling ::
+	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled),
+									GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
+
+	priv->sView = gtk_source_view_new ();
+	gtk_container_add (GTK_CONTAINER(scrolled), priv->sView);
+
+	priv->lm = gtk_source_language_manager_new ();
+	priv->sBuffer = gtk_source_buffer_new (NULL);
+	gtk_source_buffer_set_highlight_syntax (GTK_SOURCE_BUFFER(priv->sBuffer), TRUE);
+
+	gtk_text_view_set_buffer (GTK_TEXT_VIEW (priv->sView), GTK_TEXT_BUFFER(priv->sBuffer));
+
+	gtk_container_add (GTK_CONTAINER(self), priv->vbox);
+	gtk_box_pack_start (GTK_BOX(priv->vbox), priv->hbox, TRUE, TRUE, 5);
+
+	gtk_box_pack_start (GTK_BOX(priv->vbox), priv->OpenButton, FALSE, FALSE, 5);
+	gtk_box_pack_start (GTK_BOX(priv->vbox), priv->cButton, FALSE, FALSE, 5);
+	gtk_box_pack_start (GTK_BOX(priv->vbox), priv->javaButton, FALSE, FALSE, 5);
+	gtk_box_pack_start (GTK_BOX(priv->vbox), priv->pyButton, FALSE, FALSE, 5);	
+
+	gtk_box_pack_start (GTK_BOX(priv->hbox), scrolled, TRUE, TRUE, 0);
+
+	g_signal_connect (priv->OpenButton, "clicked",
+						G_CALLBACK (gu_code_viewer_open_file), self);					
+	g_signal_connect (priv->cButton, "clicked",
+						G_CALLBACK (gu_code_viewer_set_langhightlight), self);
+	g_signal_connect (priv->javaButton, "clicked", 
+						G_CALLBACK (gu_code_viewer_set_langhightlight), self);
+	g_signal_connect (priv->pyButton, "clicked",
+						G_CALLBACK (gu_code_viewer_set_langhightlight), self);
+	g_signal_connect (self, "destroy",
+						G_CALLBACK (gtk_main_quit), NULL);
+}
+
+
+GtkWidget *
+gu_code_viewer_new (void)
+{
+  return g_object_new (GU_TYPE_CODE_VIEWER,
+						"type", GTK_WINDOW_TOPLEVEL,
+						"default-width", 640, "default-height", 480,
+						"window-position", GTK_WIN_POS_CENTER,
+						NULL);
+}

src/gtksourceview-example/gucodeviewer.h

@@ -0,0 +1,69 @@
+/*
+ * gucodeviewer.h
+ * 
+ * Copyright 2013 userx <userx@AdventChildren>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ * 
+ * 
+ */
+
+
+#ifndef GUCODEVIEWER_H_
+#define GUCODEVIEWER_H_
+
+#include <gtk/gtk.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+
+#define GU_TYPE_CODE_VIEWER             (gu_code_viewer_get_type ())
+#define GU_CODE_VIEWER(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), GU_TYPE_CODE_VIEWER, GuCodeViewer))
+#define GU_CODE_VIEWER_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), GU_TYPE_CODE_VIEWER, GuCodeViewerClass))
+#define GU_IS_CODE_VIEWER(obj)          (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GU_TYPE_CODE_VIEWER))
+#define GU_IS_CODE_VIEWER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), GU_TYPE_CODE_VIEWER))
+#define GU_CODE_VIEWER_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), GU_TYPE_CODE_VIEWER, GuCodeViewerClass))
+
+typedef struct GuCodeViewer_         GuCodeViewer;
+typedef struct GuCodeViewerClass_    GuCodeViewerClass;
+typedef struct GuCodeViewerPrivate_  GuCodeViewerPrivate;
+
+struct GuCodeViewer_
+{
+  GtkWindow parent;
+  /* add your public declarations here */
+  GuCodeViewerPrivate * priv;
+};
+
+struct GuCodeViewerClass_
+{
+  GtkWindowClass parent_class;
+};
+
+
+GType gu_code_viewer_get_type (void) G_GNUC_CONST;
+GtkWidget *gu_code_viewer_new (void);
+
+// callbacks ::
+void gu_code_viewer_open_file (GtkWidget * widget,
+								gpointer user_data);
+void gu_code_viewer_set_langhightlight (GtkWidget * widget,
+										gpointer user_data);
+
+G_END_DECLS
+
+#endif /* GUCODEVIEWER_H_ */

src/gtksourceview-example/main.c

@@ -0,0 +1,39 @@
+/*
+ * main.c
+ * 
+ * Copyright 2013 userx <userx@AdventChildren>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ * 
+ * 
+ */
+
+
+#include <gtk/gtk.h>
+#include "gucodeviewer.h"
+
+int main(int argc, char **argv)
+{
+	GtkWidget * window;
+	gtk_init(&argc, &argv);
+
+	window = gu_code_viewer_new ();
+
+	gtk_widget_show_all (window);
+	gtk_main();
+	return 0;
+}
+