virtual BOOL on_draw(HELEMENT he, UINT draw_type, HDC hdc, const
RECT &rc)
{
if ((DRAW_EVENTS)draw_type != where)
return FALSE;
// do default draw
int w = rc.right - rc.left;
int h = rc.bottom - rc.top;
if (!surface)
{
surface = image::create(w, h);
redraw = true;
}
else if (w != surface->width() || h != surface->height())
{
delete surface;
surface = image::create(w, h);
redraw = true;
}
else if (redraw)
surface->clear();
if (redraw)
{
graphics gx(surface);
draw(he, gx, w, h);
redraw = false;
}
surface->blit(hdc, rc.left, rc.top);
return default_draw ? TRUE : FALSE;
}
