From 4ec232d2621c5dec285b019a7c565621ee83577e Mon Sep 17 00:00:00 2001
From: Ali Gholami Rudi <ali@rudi.ir>
Date: Sat, 28 Feb 2009 21:39:55 +0330
Subject: [PATCH] txtwin: use adjustments for scrolling

---
 txtwin.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/txtwin.c b/txtwin.c
index 2bdd773..9a13eb7 100644
--- a/txtwin.c
+++ b/txtwin.c
@@ -10,6 +10,7 @@ struct txtwin {
 	GtkWidget *main;
 	/* A GtkEntry */
 	GtkWidget *bar;
+	GtkAdjustment *adjst;
 };
 
 static void on_window_destroy(GtkWidget *widget, gpointer data)
@@ -17,18 +18,17 @@ static void on_window_destroy(GtkWidget *widget, gpointer data)
 	gtk_main_quit();
 }
 
-static void scroll(GtkTextView *view, float amount)
+static void scroll(struct txtwin *tw, int count)
 {
-	GdkRectangle rect;
-	GtkTextIter iter;
-	GtkTextBuffer *buffer;
-	int y;
-	buffer = gtk_text_view_get_buffer(view);
-	gtk_text_view_get_visible_rect(view, &rect);
-	y = rect.y + amount * rect.height;
-	gtk_text_view_get_iter_at_location(view, &iter, 0, y);
-	gtk_text_view_scroll_to_iter(GTK_TEXT_VIEW(view), &iter,
-				     0.0, TRUE, 0, 0);
+	int val = gtk_adjustment_get_value(tw->adjst);
+	int max = gtk_adjustment_get_upper(tw->adjst) -
+		  gtk_adjustment_get_page_size(tw->adjst);
+	val += count * gtk_adjustment_get_step_increment(tw->adjst);
+	if (val > max)
+		val = max;
+	if (val < 0)
+		val = 0;
+	gtk_adjustment_set_value(tw->adjst, val);
 }
 
 static gboolean on_key_press(GtkWidget *widget, GdkEventKey *event,
@@ -37,10 +37,10 @@ static gboolean on_key_press(GtkWidget *widget, GdkEventKey *event,
 	struct txtwin *tw = data;
 	switch(event->keyval) {
 	case GDK_j:
-		scroll(GTK_TEXT_VIEW(tw->main), 0.05);
+		scroll(tw, 1);
 		break;
 	case GDK_k:
-		scroll(GTK_TEXT_VIEW(tw->main), -0.05);
+		scroll(tw, -1);
 		break;
 	case GDK_q:
 		gtk_main_quit();
@@ -55,7 +55,6 @@ struct txtwin *txtwin_alloc()
 {
 	GtkWidget *window;
 	GtkWidget *vbox;
-	GtkTextBuffer *buffer;
 	struct txtwin *tw = xmalloc(sizeof(struct txtwin));
 	memset(tw, 0, sizeof(*tw));
 	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
@@ -75,8 +74,9 @@ struct txtwin *txtwin_alloc()
 				    GTK_WRAP_WORD);
 	gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(tw->main), FALSE);
 
-	/* write something */
-	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tw->main));
+	/* add the adjustment */
+	tw->adjst = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, 100, 1, 9, 10));
+	gtk_widget_set_scroll_adjustments(tw->main, NULL, tw->adjst);
 
 	/* create the minibuffer */
 	tw->bar = gtk_entry_new();
-- 
2.11.4.GIT