Il 04/11/2013 15:24, Jasper St. Pierre ha scritto:
> Hm. This shouldn't be happening. What version of GTK+3 are you using,
> and can you produce a small reproducible example[0] ?
>
> [0] http://sscce.org/
>
Please, find the attached example. I can get what I think is the right
behaviour by commenting the call to the drawing function in
on_daCairo_draw() callback, but when I have any cairo_ action, the
result is an infinite firing.
Release I'm currently using is 3.8.4 (Debian testing current version).
>
> On Mon, Nov 4, 2013 at 9:18 AM, onetmt <onetmt@xxxxxxxxx
> <mailto:onetmt@xxxxxxxxx>> wrote:
>
> Il 04/11/2013 15:06, Jasper St. Pierre ha scritto:
> > Connect to the "draw" signal on the widget to do your drawing, and
> call
> > gtk_widget_queue_redraw(); on the widget if you want to request a
> redraw.
> >
> This is what I'm currently doing (I've connected to "draw" signal of a
> GtkDrawingArea), but the problem is that I have the "draw" event fired
> continuosly.
>
>
> >
> > On Mon, Nov 4, 2013 at 9:02 AM, onetmt <onetmt@xxxxxxxxx
> <mailto:onetmt@xxxxxxxxx>
> > <mailto:onetmt@xxxxxxxxx <mailto:onetmt@xxxxxxxxx>>> wrote:
> >
> > I'm currently in the process of porting to gtk+-3 an old finite
> > difference calculation application; this application had a
> custom graph
> > drawing routine based on gdk_ subsystem that cannot be
> compiled anymore
> > against new gtk3 api :( . I succesfully converted every gdk_
> invocation
> > in their cairo_ counterparts, but now I have to substitute the
> no longer
> > available "expose-event" with the new "draw" event. The
> problem is that
> > it runs continuosly in an infinite loop.
> >
> > What is the expected mechanism of this new event? How can I
> refresh the
> > graph in a clean way as in old expose-event?
> >
> > TIA
> >
> > --
> > Hofstadter's Law:
> > "It always takes longer than you expect, even when you take
> into account
> > Hofstadter's Law."
> > _______________________________________________
> > gtk-list mailing list
> > gtk-list@xxxxxxxxx <mailto:gtk-list@xxxxxxxxx>
> <mailto:gtk-list@xxxxxxxxx <mailto:gtk-list@xxxxxxxxx>>
> > https://mail.gnome.org/mailman/listinfo/gtk-list
> >
> >
> >
> >
> > --
> > Jasper
>
>
> --
> Hofstadter's Law:
> "It always takes longer than you expect, even when you take into account
> Hofstadter's Law."
> _______________________________________________
> gtk-list mailing list
> gtk-list@xxxxxxxxx <mailto:gtk-list@xxxxxxxxx>
> https://mail.gnome.org/mailman/listinfo/gtk-list
>
>
>
>
> --
> Jasper
--
Hofstadter's Law:
"It always takes longer than you expect, even when you take into account
Hofstadter's Law."
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
* cairo_test.c
*/
#include <gtk/gtk.h>
#include <glib.h>
#include <cairo.h>
#include <pango/pango.h>
#include <stdio.h>
#include <locale.h>
#define UI_STRING "<?xml version=\"1.0\" encoding=\"UTF-8\"?> \
<interface> \
<!-- interface-requires gtk+ 3.0 --> \
<object class=\"GtkWindow\" id=\"window\"> \
<property name=\"can_focus\">False</property> \
<property name=\"window_position\">center</property> \
<property name=\"default_width\">450</property> \
<property name=\"default_height\">450</property> \
<signal name=\"destroy\" handler=\"on_window_destroy\" swapped=\"no\"/> \
<child> \
<object class=\"GtkBox\" id=\"box1\"> \
<property name=\"visible\">True</property> \
<property name=\"can_focus\">False</property> \
<property name=\"orientation\">vertical</property> \
<property name=\"spacing\">5</property> \
<child> \
<placeholder/> \
</child> \
<child> \
<object class=\"GtkDrawingArea\" id=\"daCairo\"> \
<property name=\"visible\">True</property> \
<property name=\"app_paintable\">True</property> \
<property name=\"can_focus\">False</property> \
<signal name=\"draw\" handler=\"on_daCairo_draw\" swapped=\"no\"/> \
</object> \
<packing> \
<property name=\"expand\">True</property> \
<property name=\"fill\">True</property> \
<property name=\"position\">1</property> \
</packing> \
</child> \
<child> \
<object class=\"GtkButtonBox\" id=\"buttonbox1\"> \
<property name=\"visible\">True</property> \
<property name=\"can_focus\">False</property> \
<property name=\"spacing\">5</property> \
<property name=\"layout_style\">start</property> \
<child> \
<object class=\"GtkButton\" id=\"btnDraw\"> \
<property name=\"label\" translatable=\"yes\">Draw</property> \
<property name=\"visible\">True</property> \
<property name=\"can_focus\">True</property> \
<property name=\"receives_default\">True</property> \
<signal name=\"clicked\" handler=\"on_btnDraw_clicked\" swapped=\"no\"/> \
</object> \
<packing> \
<property name=\"expand\">False</property> \
<property name=\"fill\">True</property> \
<property name=\"position\">0</property> \
</packing> \
</child> \
<child> \
<placeholder/> \
</child> \
<child> \
<placeholder/> \
</child> \
</object> \
<packing> \
<property name=\"expand\">False</property> \
<property name=\"fill\">True</property> \
<property name=\"position\">2</property> \
</packing> \
</child> \
</object> \
</child> \
</object> \
</interface>"
/*
* Da builder - variabile globale
*/
GtkBuilder *builder;
float thick = 1.0;
/* Called when the window is closed
*/
G_MODULE_EXPORT void on_window_destroy(GtkWidget *self, gpointer data)
{
gtk_main_quit();
}
void draw_me(GtkWidget *self, cairo_t *cr)
{
GdkRGBA rosa, bianco, nero, rosso;
gint width, height;
gdouble dash[] = {10.0, 10.0};
rosa.red = 1;
rosa.green = 0.2;
rosa.blue = 0.2;
rosa.alpha = 0.6;
rosso.red = 1;
rosso.green = 0;
rosso.blue = 0;
rosso.alpha = 0.6;
bianco.red = 1;
bianco.green = 1;
bianco.blue = 1;
bianco.alpha = 1;
nero.red = 0;
nero.green = 0;
nero.blue = 0;
nero.alpha = 1;
//cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.6);
gdk_cairo_set_source_rgba(cr, &rosa);
cairo_set_line_width(cr, thick);
cairo_set_dash(cr, dash, 2, 0);
gdk_window_set_background_rgba(gtk_widget_get_window(self), &bianco);
cairo_move_to(cr, 128.0, 25.6);
cairo_line_to(cr, 230.4, 230.4);
cairo_stroke(cr);
gdk_cairo_set_source_rgba(cr, &rosso);
cairo_set_dash(cr, dash, 0, 0);
cairo_move_to(cr, 230.4, 230.4);
cairo_rel_line_to(cr, -102.4, 0.0);
cairo_rel_line_to(cr, 100, 100);
cairo_stroke(cr);
gdk_cairo_set_source_rgba(cr, &nero);
cairo_move_to(cr, 250, 250);
cairo_set_font_size(cr, 16.0);
cairo_show_text(cr, "A ciccio");
gdk_window_get_geometry(gtk_widget_get_window(self), NULL, NULL, &width, &height);
cairo_rectangle(cr, 0, 0, width, height);
cairo_stroke(cr);
}
/** @fn on_btnQuit_clicked(GtkButton *, gpointer)
* Callback collegata al pulsante "Quit".
*/
G_MODULE_EXPORT void on_btnDraw_clicked(GtkButton *self, gpointer data)
{
GtkWidget *da;
cairo_rectangle_int_t rec;
g_print("drawing...\n");
if (thick < 10.0)
{
thick *= 1.5;
}
else
{
thick = 1.0;
}
da = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
rec.x = 0;
rec.y = 0;
gdk_window_get_geometry(gtk_widget_get_window(da), NULL, NULL, &(rec.width), &(rec.height));
gdk_window_invalidate_rect(gtk_widget_get_window(da), &rec, TRUE);
}
G_MODULE_EXPORT gboolean on_daCairo_draw(GtkWidget *self, cairo_t *cr, gpointer data)
{
g_print("draw+");
/* all drawing actions are performed by this function
*/
draw_me(self, cr);
return FALSE;
}
static GtkWidget *create_window(void)
{
GtkWidget *window;
GError *error = NULL;
/*
* Load UI from file
*/
builder = gtk_builder_new();
//if (!gtk_builder_add_from_file(builder, "./cairo_test.ui", &error))
if (!gtk_builder_add_from_string(builder, UI_STRING, -1, &error))
{
g_critical("Couldn't load builder file: %s", error->message);
g_error_free(error);
}
/*
* Get the window object from the ui file
*/
window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
if (!window)
{
g_critical("Widget \"%s\" is missing in file %s.",
"window",
"./cairo_test.ui");
}
/*
* Auto-connect signal handlers
*/
gtk_builder_connect_signals(builder, window);
return window;
}
int main(int argc, char *argv[])
{
GtkWidget *window;
/*
* Prima di invocare il main loop, imposto il locale
* di default ("C", per leggere i float con il punto)
*/
setlocale(/*LC_NUMERIC*/1, "C");
gtk_disable_setlocale();
gtk_init(&argc, &argv);
window = create_window();
gtk_widget_show(window);
gtk_main();
g_object_unref(builder);
return 0;
}
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