Please explain 1st arg of configure & expose event functions...

[Chris Seberino <seberino spawar navy mil>]

Examples of configure and expose event functions
have a mysterious GtkWidget for the first arg.
I cannot seem to discern what it is.

Please explain...


Here is an example of an expose event function:

gint middleMassTimeSeriesPlotPatch(GtkWidget* widget, GdkEventExpose* event) {
   gdk_draw_pixmap(widget->window, widget->style->fg_gc[GTK_WIDGET_STATE(widget)],
      Pixmaps::middleMassTimeSeriesPlot, event->area.x, event->area.y,
      event->area.x, event->area.y, event->area.width, event->area.height);

   return FALSE;
};

Here is an example of a configure event function:

gint middleMassTimeSeriesPlotDraw(GtkWidget* widget, GdkEventConfigure* event) {
   gdk_pixmap_unref(Pixmaps::middleMassTimeSeriesPlot);
   Pixmaps::middleMassTimeSeriesPlot = gdk_pixmap_new(widget->window,
      widget->allocation.width, widget->allocation.height, -1);
   gdk_draw_rectangle(Pixmaps::middleMassTimeSeriesPlot,
      widget->style->black_gc, TRUE, 0, 0,
      widget->allocation.width, widget->allocation.height);
   gdk_draw_line(Pixmaps::middleMassTimeSeriesPlot, widget->style->white_gc, 0, 0,
      widget->allocation.width, widget->allocation.height);
   gdk_draw_line(Pixmaps::middleMassTimeSeriesPlot, 
      widget->style->white_gc, 0, widget->allocation.height,
      widget->allocation.width, 0);

   return TRUE;
};

What is all this widget->allocation.height, widget->window stuff and where
did it come from and why is it useful?

Thanks,

Chris

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