Re: base_graphics_backend

[Ryan Rusaw]

On Wed, Sep 10, 2008 at 2:00 AM, Michael Goffioul
<address@hidden> wrote:
> There's something strange in this backtrace: when delete_children()
> is called from axes::properties::set_defaults(), normally the title
> and labels contains invalid handles, such that the call to free()
> (from delete_children()) should not trigger any object_destroyed()
> in the backend. It seems that between "title = graphics_handle ()"
> and "delete_children ()" (in axes::properties::set_defaults), the handle
> for the title is recreated. Ryan, could you track this down?
>
> Michael.
>

#0  octave_eclipse_backend::object_created (this=0x84634c0, address@hidden)
    at octave_eclipse_backend.cc:578
#1  0xb7542571 in gh_manager::do_make_graphics_handle (this=0x81c9c08,
    address@hidden, address@hidden, do_createfcn=true) at ./graphics.h:1519
#2  0xb7546f43 in axes::properties::get_title (this=0x84de100)
    at ./graphics.h:8584
#3  0xb754be6e in axes::properties::get (this=0x84de100, address@hidden)
    at ./graphics-props.cc:1390
#4  0xb51dce2b in octave_eclipse_backend::property_changed (this=0x84634c0,
    address@hidden, id=3001) at octave_eclipse_backend.cc:525
#5  0xb7526946 in base_property::set (this=0x84de720, address@hidden,
    do_run=true) at ./graphics.h:1512
#6  0xb754705d in axes::properties::set_defaults (this=0x84de100,
    address@hidden, address@hidden) at ./graphics.h:1125
#7  0xb759b63b in axes::set_defaults (this=0x84de0f8, address@hidden)
    at ./graphics.h:5288
#8  0xb7562b07 in F__go_axes_init__ (address@hidden) at ./graphics.h:2209

It looks like when set_defaults assigns a graphics handle to the title
property, it calls property_changed on the title. My backend then
attempts to get the property value from the object which results in
another text object being created.

And now to sleep.

Ryan