Re: Emulating a block cursor in GtkSourceView

[Paolo Borelli <pborelli katamail com>]

Il giorno dom, 24/08/2008 alle 21.14 +0100, Tony Houghton ha scritto:
> I'm trying to emulate a block cursor in GtkSourceView by superimposing a
> rectangle over it.

Which version of gtk are you using? Block cursor when pressing INS has
been included since gtk 2.12 (or maybe even 2.10, I do not recall the
details). I guess you can simply require that version of gtk or take a
look at gtk itself to see how it is implemented

ciao
	Paolo


>  I registered a handler for expose-event with
> g_signal_connect_after, and it does get called with expected
> coordinates, but no rectangle appears. I'm trying to draw it with
> gdk_draw_rectangle on the widget's window field.
> 
> I don't know whether the reason for the failure is because I haven't set
> up the GdkGC properly (do I need to set a clip mask pixmap? - I don't
> understand how; does leaving it blank draw everything?) or something or
> if you just can't draw on top of widgets this way.
> 
> Can anyone help? Is this a generic widget issue so I'd be better off
> asking in the gtk-app-devel list? The essentials of my code (in python)
> are below.
> 
>     @staticmethod
>     def eor_colours(c1, c2):
>         return gtk.gdk.Color(c1.red ^ c2.red, \
>                 c1.green ^ c2.green, c1.blue ^ c2.blue)
> 
>     ...
> 
>     def set_style(self, widget = None, old_style = None):
>         ...
>         # self.view is the gtksourceview2.View
>         self.win = self.view.get_window(gtk.TEXT_WINDOW_WIDGET)
>         ...
>         c = self.eor_colours(style.base[gtk.STATE_NORMAL], self.colour)
>         self.norm_gc = gtk.gdk.GC(self.win, c, c, None,
>                 gtk.gdk.XOR, gtk.gdk.SOLID,
>                 line_width = 1, line_style = gtk.gdk.LINE_SOLID)
> 
>     ...
> 
>     def enable(self):
>         ...
>         if self.expose_tag == None:
>             self.expose_tag = self.view.connect_after("expose-event",
>                     self.expose_handler)
>         ...
> 
>     # ... there's some code to work out the cursor position and store it
>     # in self.rect and call self.win.invalidate_rect() whenever it
>     # moves, blinks or otherwise needs updating
> 
>     def expose_handler(self, widget, event):
>         if self.blinked_off or not self.rect or not self.enabled:
>             return True
>         intersect = event.area.intersect(self.rect)
>         if intersect.width and intersect.height:
>             if not self.norm_gc:
>                 self.set_style()
>             if self.in_selection:
>                 gc = self.sel_gc
>             else:
>                 gc = self.norm_gc
>             self.win.draw_rectangle(gc, self.has_focus,
>                     self.rect.x, self.rect.y, self.rect.width, self.rect.height)
>         return True     # I've tried False here, no apparent difference
>