gtk+: how to refresh canvas immediately (closed) -


followed layout in gtk+.

+----------------------------+------+------+------+ |                            |page 1|page 2|page 3| |                            +------+------+------+ |                            |                    | |                            |                    | |     canvas area            |                    | |                            |                    | |                            |                    | |                            |                    | |                            |                    | |                            |                    | +------------------+---------+                    | |                  | button  |                    | |                  +---------+                    | |                            |                    | |                            |                    | |                            |                    | |                            |                    | +----------------------------+--------------------+

-> "canvas area" , "button" on left in vertical box. "page 1~3" on right pages of notebook in vertical box.

-> "canvas area" on left created gtk_drawing_area_new , connected signal expose-event.

-> in "page 3", there "canvas area", created above.

-> every time when press "button", "canvas area" on left refreshed @ once.

the problem is

-> if page 3 current page, when pressing "button", "canvas area" in page 3 won't refresh until switch page, e.g., page 1 or page 2, switch page 3. seemed signal expose-event won't emit if staying "page 3".

-> possible refresh "canvas area" in page 3 when page 3 current page, "canvas area" on left refreshes when pressing "button"?

-> haved tried gdk_threads_enter, gdk_threads_leave, didn't work.

please help. thank you.

followed small example. works well, mean problem mentioned above won't come up. problem in function "button_pressed" missed "gdk_invalidate_region (g_object_get_data(g_object(widget), "right_canvas"));" in application.

#include <gtk/gtk.h>  int num, if_draw = 0;  void gdk_invalidate_region (gtkwidget *obj) {   gdkregion *region;    region = gdk_drawable_get_visible_region(obj->window);   gdk_window_invalidate_region(obj->window, region, true);   gdk_region_destroy (region);   gtk_widget_queue_draw(obj);   /* gdk_window_process_updates(obj->window, true); */ }  void num_changed (gtkwidget *box, gtkwidget *window) {   num = gtk_option_menu_get_history((gtkoptionmenu *)box) + 1;   if_draw = 0;   gdk_invalidate_region (g_object_get_data(g_object(window), "left_canvas"));   gdk_invalidate_region (g_object_get_data(g_object(window), "right_canvas")); }  gboolean draw_expose_left (gtkwidget *canvas, gdkeventexpose *event, gpointer user_data) {   cairo_t *cr;    cr = gdk_cairo_create (canvas->window);   if(if_draw)   {     int i;      cairo_set_line_width (cr, 0.7);     for(i = 0; < num; i++)     {       printf("i=%d\n", i);       cairo_move_to(cr, 50, (i + 1) * 50);       cairo_rel_line_to(cr, 150, 0);       cairo_stroke(cr);     }   }   else   {     cairo_select_font_face(cr, "sans", cairo_font_slant_normal, cairo_font_weight_bold);     cairo_set_font_size(cr, 0.35);     cairo_move_to(cr, 5, canvas->allocation.height / 2);     cairo_show_text(cr, "press button \"press..\" update!!");   }   cairo_destroy (cr);    return false; }  gboolean draw_expose_right (gtkwidget *canvas, gdkeventexpose *event, gpointer user_data) {   cairo_t *cr;    cr = gdk_cairo_create (canvas->window);   if(if_draw)   {     int i;      cairo_set_line_width (cr, 0.7);     for(i = 0; < num; i++)     {       printf("i=%d\n", i);       cairo_move_to(cr, (i + 1) * 50, 50);       cairo_rel_line_to(cr, 0, 100);       cairo_stroke(cr);     }   }   else   {     cairo_select_font_face(cr, "sans", cairo_font_slant_normal, cairo_font_weight_bold);     cairo_set_font_size(cr, 0.35);     cairo_move_to(cr, 5, canvas->allocation.height / 2);     cairo_show_text(cr, "press button \"press..\" update!!");   }   cairo_destroy (cr);    return false; }  void button_pressed (gtkwidget *button, gtkwidget *widget) {   gdk_invalidate_region (g_object_get_data(g_object(widget), "left_canvas"));   gdk_invalidate_region (g_object_get_data(g_object(widget), "right_canvas"));   if_draw = 1; }  int main (int argc, char *argv[]) {   gtkwidget *window, *main_box, *box, *hbox, *entry, *menu, *menu_item;   gtkwidget *notebook, *label;    gtk_init(&argc, &argv);    window = gtk_window_new (gtk_window_toplevel);   /* gtk_window_set_default_size(gtk_window(window), 300, 200); */   g_signal_connect(g_object(window), "destroy", g_callback(gtk_main_quit), null);    main_box = gtk_hbox_new(false, 0);   gtk_container_add(gtk_container(window), main_box);   gtk_widget_show(main_box);    /***** left **********/   box = gtk_vbox_new(false, 0);   gtk_box_pack_start(gtk_box(main_box), box, false, true, 0);   gtk_widget_show(box);    entry = gtk_drawing_area_new();   gtk_widget_set_size_request(entry, 400, 200);   g_object_set_data(g_object(window), "left_canvas", entry);   gtk_widget_show(entry);   gtk_box_pack_start(gtk_box(box), entry, true, true, 0);   g_signal_connect(g_object(entry), "expose-event", g_callback(draw_expose_left), window);    hbox = gtk_hbox_new(false, 0);   gtk_box_pack_start(gtk_box(box), hbox, false, true, 0);   gtk_widget_show(hbox);    entry = gtk_label_new("num: ");   gtk_box_pack_start(gtk_box(hbox), entry, true, true, 0);   gtk_widget_show(entry);    entry = gtk_option_menu_new();   gtk_widget_set_size_request(entry, 40, -1);   gtk_box_pack_start(gtk_box(hbox), entry, true, true, 0);   gtk_widget_show(entry);    menu = gtk_menu_new();   menu_item = gtk_menu_item_new_with_label("1");   gtk_widget_show(menu_item);   gtk_menu_shell_append(gtk_menu_shell(menu), menu_item);   menu_item = gtk_menu_item_new_with_label("2");   gtk_widget_show(menu_item);   gtk_menu_shell_append(gtk_menu_shell(menu), menu_item);   menu_item = gtk_menu_item_new_with_label("3");   gtk_widget_show(menu_item);   gtk_menu_shell_append(gtk_menu_shell(menu), menu_item);   gtk_option_menu_set_menu(gtk_option_menu(entry), menu);   gtk_option_menu_set_history((gtkoptionmenu *)entry, 1);   num = 2;   gtk_signal_connect(gtk_object(entry), "changed", gtk_signal_func(num_changed), window);    entry = gtk_button_new_with_label("press..");   gtk_box_pack_start(gtk_box(hbox), entry, true, true, 0);   gtk_signal_connect(gtk_object(entry), "clicked", gtk_signal_func(button_pressed), window);   gtk_widget_show(entry);   /*********************/    /***** right *********/   box = gtk_vbox_new(false, 0);   gtk_box_pack_start(gtk_box(main_box), box, false, true, 0);   gtk_widget_show(box);    notebook = gtk_notebook_new();   gtk_notebook_set_tab_pos(gtk_notebook(notebook), gtk_pos_top);   gtk_box_pack_start(gtk_box(box), notebook, true, true, 0);   /* g_signal_connect(g_object(notebook), "switch-page", g_callback(qqaa_show_page_status_acc_platform), window); */   gtk_widget_show(notebook);    entry = gtk_label_new("one");   label = gtk_label_new("page 1");   gtk_notebook_append_page(gtk_notebook(notebook), entry, label);    entry = gtk_label_new("two");   label = gtk_label_new("page 2");   gtk_notebook_append_page(gtk_notebook(notebook), entry, label);    entry = gtk_drawing_area_new();   gtk_widget_set_size_request(entry, 400, 200);   g_object_set_data(g_object(window), "right_canvas", entry);   gtk_widget_show(entry);   g_signal_connect(g_object(entry), "expose-event", g_callback(draw_expose_right), window);   label = gtk_label_new("page 3");   gtk_notebook_append_page(gtk_notebook(notebook), entry, label);   /*********************/    gtk_widget_show_all(window);    gtk_main();    return 0; }


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