Re: Obtaining a location on a Drawing Area via a mouse click.

[Billy Patton <bpatton dal asp ti com>]

Here's my mouse motion sub that will get what you need :)
gint motion_notify_event(GtkWidget *widget,GdkEventMotion *event)
{
  point_t         pt;
  GdkModifierType state;
  gchar           buffer[64];
  static gint     message_id = INT_MIN;
  char            *cname = NULL;

  if (event->is_hint)
    gdk_window_get_pointer (event->window, &pt.x, &pt.y, &state);
  else
    {
      pt.x = event->x;
      pt.y = event->y;
      state = event->state;
    }
  if (fcellp) cname = fcellp->name;
  pt.x = (int)((pt.x * scale) + shiftX);

  pt.y = canvas_y - pt.y;
  pt.y = (int)((pt.y * scale) + shiftY);
  RoundPt(&pt,50);
  sprintf(buffer,"%s  ,  XY : %d,%d",(cname)?cname:"NO CELL SELECTED",pt.x,pt.y);

  if (message_id NE INT_MIN)
    gtk_statusbar_remove(GTK_STATUSBAR(widget)
                        ,context_id
                        ,message_id);
   message_id = gtk_statusbar_push(GTK_STATUSBAR(widget)
                                  ,context_id
                                  ,buffer);
  return TRUE;
}

Colin Thomas wrote:

> Hi,
>
> I would like to be able to click on a Drawing area and extract
> the cursors position, and possibly drag-select over its suface.
>
> Are there any tutorials on this?
>
> I have connected a function to the button release on the Drawing
> Area (see below), this does not seem to trigger the function call,
>
>   gtk_signal_connect (GTK_OBJECT (guiDrawingArea), "button_press_event",
>                       GTK_SIGNAL_FUNC (on_guiDrawingArea_button_press_event),
>                       NULL);
>
> But even if I managed to get the function call to execute, from where do
> I extract the cursor's location..
>
> I look forward to your collective wisdom..
>
> Many thanks in advance..
>
> Colin Thomas.
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | Colin Thomas.
> | Email   : colin designresources co uk
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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