X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=libchimara%2Fpager.c;h=c88ab63630c3918478e7c1d75027af4a85307175;hb=441fcc88b3dfe63ca59faf77c00caf7504497c35;hp=f9a0a32c69fa0b670ba01162603ec988e401513e;hpb=a2e82e317a6000511953c2dbc0eb1026c7b245a7;p=rodin%2Fchimara.git

diff --git a/libchimara/pager.c b/libchimara/pager.c
index f9a0a32..c88ab63 100644
--- a/libchimara/pager.c
+++ b/libchimara/pager.c
@@ -5,8 +5,8 @@
 /* Helper function: move the pager to the last visible position in the buffer,
  and return the distance between the pager and the end of the buffer in buffer
  coordinates */
-static gint
-move_pager_and_get_scroll_distance(GtkTextView *textview)
+static void
+move_pager_and_get_scroll_distance(GtkTextView *textview, gint *view_height, gint *scroll_distance, gboolean move )
 {
 	GdkRectangle pagerpos, endpos, visiblerect;
 	GtkTextIter oldpager, newpager, end;
@@ -15,27 +15,35 @@ move_pager_and_get_scroll_distance(GtkTextView *textview)
 	
 	/* Get an iter at the lower right corner of the visible part of the buffer */
 	gtk_text_view_get_visible_rect(textview, &visiblerect);
-	gtk_text_view_get_iter_at_location(textview, &newpager, visiblerect.x + visiblerect.width, visiblerect.y + visiblerect.height);
+	gtk_text_view_get_iter_at_location(
+		textview,
+		&newpager,
+		visiblerect.x + visiblerect.width,
+		visiblerect.y + visiblerect.height
+	);
 	gtk_text_buffer_get_iter_at_mark(buffer, &oldpager, pager);
 	
-	gtk_text_buffer_move_mark(buffer, pager, &newpager);
+	if(move)
+		gtk_text_buffer_move_mark(buffer, pager, &newpager);
 
 	/* Get the buffer coordinates of the pager and the end iter */
 	gtk_text_buffer_get_end_iter(buffer, &end);
 	gtk_text_buffer_get_iter_at_mark(buffer, &newpager, pager);
 	gtk_text_view_get_iter_location(textview, &newpager, &pagerpos);
 	gtk_text_view_get_iter_location(textview, &end, &endpos);
+
+	g_printerr("View height = %d\n", visiblerect.height);
+	g_printerr("End - Pager = %d\n", endpos.y - pagerpos.y);
 	
-	//g_printerr("View height = %d\n", visiblerect.height);
-	//g_printerr("End - Pager = %d\n", endpos.y - pagerpos.y);
-	
-	return endpos.y - pagerpos.y;
+	*view_height = visiblerect.height;
+	*scroll_distance = endpos.y - pagerpos.y;
 }
 
 /* Helper function: turn on paging for this textview */
 static void
 start_paging(winid_t win)
 {
+	printf("Start paging\n");
 	win->currently_paging = TRUE;
 	g_signal_handler_unblock(win->widget, win->pager_expose_handler);
 	g_signal_handler_unblock(win->widget, win->pager_keypress_handler);
@@ -45,34 +53,66 @@ start_paging(winid_t win)
 static void
 stop_paging(winid_t win)
 {
+	printf("Stop paging\n");
 	win->currently_paging = FALSE;
 	g_signal_handler_block(win->widget, win->pager_expose_handler);
 	g_signal_handler_block(win->widget, win->pager_keypress_handler);
 }
 
-/* Update the pager position after new text is inserted in the buffer */
-void
-pager_after_insert_text(GtkTextBuffer *buffer, GtkTextIter *location, gchar *text, gint len, winid_t win)
+/* Check whether paging should be done. This function is called inside the 
+ * idle handler, after the textview has finished updating. */
+gboolean
+pager_check(gpointer data)
 {
-	while(gtk_events_pending())
-		gtk_main_iteration();
-	
+
+	printf("pager check (idle)...\n");
+	winid_t win = (winid_t) data;
+
+
 	/* Move the pager to the last visible character in the buffer */
-	gint scroll_distance = move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget) );
+	gint view_height, scroll_distance;
+	move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, FALSE );
+
+	gdk_threads_enter();
+
+	if(view_height <= 1)
+		/* Paging is unusable when window is too small */
+		return FALSE;
 	
-	if(scroll_distance > 0 && !win->currently_paging)
-		start_paging(win);
+	if(!win->currently_paging) {
+		if(scroll_distance > view_height) {
+			start_paging(win);
+			/* Seriously... */
+			/* COMPAT: */
+#if GTK_CHECK_VERSION(2,14,0)
+			gdk_window_invalidate_rect(gtk_widget_get_window(win->widget), NULL, TRUE);
+#else
+			gdk_window_invalidate_rect(win->widget->window, NULL, TRUE);
+#endif
+		}
+		else if(scroll_distance > 0) {
+			if(win->input_request_type != INPUT_REQUEST_NONE) {
+				GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
+				GtkTextMark *end = gtk_text_buffer_get_mark(buffer, "end_position");
+
+				gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(win->widget), end);
+			}
+		}
+	}
+	gdk_threads_leave();
+
+	/* Returning FALSE to prevent this function from being called multiple times */
+	return FALSE;
 }
 
+/* When the user scrolls up in a textbuffer, start paging. */
 void
 pager_after_adjustment_changed(GtkAdjustment *adj, winid_t win)
 {
-	while(gtk_events_pending())
-		gtk_main_iteration();
-	
 	/* Move the pager, etc. */
-	gint scroll_distance = move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget) );
-	
+	gint scroll_distance, view_height;
+   	move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, TRUE );
+
 	if(scroll_distance > 0 && !win->currently_paging)
 		start_paging(win);
 	else if(scroll_distance == 0 && win->currently_paging)
@@ -86,11 +126,6 @@ pager_after_adjustment_changed(GtkAdjustment *adj, winid_t win)
 gboolean
 pager_on_key_press_event(GtkTextView *textview, GdkEventKey *event, winid_t win)
 {
-	/*** ALTERNATIVE, POSSIBLY INFERIOR, METHOD OF SCROLLING ***
-	GtkTextMark *pagermark = gtk_text_buffer_get_mark(buffer, "pager_position");
-	gtk_text_view_scroll_to_mark(textview, pagermark, 0.0, TRUE, 0.0, 0.0);
-	*/
-
 	GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment( GTK_SCROLLED_WINDOW(win->frame) );
 	gdouble step_increment, page_size, upper, lower, value;
 	g_object_get(adj, 
@@ -131,12 +166,6 @@ pager_on_expose(GtkTextView *textview, GdkEventExpose *event, winid_t win)
 
 	/* Draw the 'more' tag */
 	GdkGC *context = gdk_gc_new(GDK_DRAWABLE(event->window));
-	/*
-	gdk_draw_layout_with_colors(event->window, context, 
-		winx + winwidth - promptwidth, 
-		winy + winheight - promptheight, 
-		prompt, &white, &red);
-	*/
 	gdk_draw_layout(event->window, context, 
 		winx + winwidth - promptwidth, 
 		winy + winheight - promptheight, 
@@ -144,3 +173,48 @@ pager_on_expose(GtkTextView *textview, GdkEventExpose *event, winid_t win)
 
 	return FALSE; /* Propagate event further */
 }
+
+gboolean
+pager_after_expose_event(GtkTextView *textview, GdkEventExpose *event, winid_t win)
+{
+	printf("pager check (expose)...\n");
+	g_idle_add(pager_check, win);
+
+//	/* Move the pager to the last visible character in the buffer */
+//	gint view_height, scroll_distance;
+//	move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, FALSE );
+//
+//	if(view_height <= 1)
+//		/* Paging is unusable when window is too small */
+//		return FALSE;
+//	
+//	if(!win->currently_paging) {
+//		if(scroll_distance > view_height) {
+//			start_paging(win);
+//			/* Seriously... */
+//			/* COMPAT: */
+//#if GTK_CHECK_VERSION(2,14,0)
+//			gdk_window_invalidate_rect(gtk_widget_get_window(win->widget), NULL, TRUE);
+//#else
+//			gdk_window_invalidate_rect(win->widget->window, NULL, TRUE);
+//#endif
+//		}
+//		else if(scroll_distance > 0) {
+//			if(win->input_request_type != INPUT_REQUEST_NONE) {
+//				GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
+//				GtkTextMark *end = gtk_text_buffer_get_mark(buffer, "end_position");
+//
+//				gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(win->widget), end);
+//			}
+//		}
+//	}
+
+	return FALSE;
+}
+
+void
+pager_after_size_request(GtkTextView *textview, GtkRequisition *requisition, winid_t win)
+{
+	printf("pager check (size request)...\n");
+	g_idle_add(pager_check, win);
+}