This is the code i have used in the application to implement the widget that
displays a number(along with decorated background).
Code Snippet:
class CMyClass: public Gtk::Widget
{
public:
//constructor and destructor
void UpdateValues(); //Will be called every second
private:
Glib::RefPtr<Gdk::Window> m_refWnd; //Self. Reference stored when
on_realize
//is called and a
new window is created
virtual void on_expose_event(GdkEventExpose * pEvent);
void DrawValue(Cairo::RefPtr<Cairo::Context> refCairo); //Draws only value
}
......
//Draws the background and then draws the new value
void CMyClass::on_expose_event(GdkEventExpose * pevent)
{
Cairo::RefPtr<Cairo::Context> refCairo;
if(m_refWnd)
{
//Create a cairo context for the window
refCairo = m_refWnd->create_cairo_context();
//Draw background (border etc)
....
//Draw label and other static text
...
//Draw value
DrawValue(refCairo);
}
}
//Simply updates the value area (only) of the widget
void CMyClass::UpdateValues()
{
Cairo::RefPtr<Cairo::Context> refCairo;
if(m_refWnd)
{
DrawValue(m_refWnd->create_cairo_context());
}
}
void CMyClass::DrawValue(Cairo::RefPtr<cairo::Context> refCairo)
{
//Create a pango layout
Glib::RefPtr<Pango::Layout> refPango = Pango::Layout::create(refCairo);
//Setup cairo with the foreground color (white)
refCairo->set_source_rgb(1, 1, 1);
//Select the font description for the pango layout object
...
//Add text to the pango object
refPango->set_text(.....);
//Set drawing position
refCairo->move_to(.......);
//Add layout info to cairo
refPango->add_to_cairo_context(refCairo);
//Clear the area in which the value is to be shown
m_refWnd->clear_area(....);
//Draw!!!
refCairo->fill();
}
On Tue, Jan 20, 2009 at 1:59 PM, dipjyoti bharali <[email protected]> wrote:
> Hi,
> I have ported my gtkmm application with directfb as backend... However in
> the application i have some text which have to blink.. They are blinking
> when iam compiling it with X11 as backend and not with directfb... Iam
> porting the gtkmm/directfb application for Alchemy db1200 board.... the X11
> port was tried with a pc tough.. directfb has been compiled for single
> application support(without fusion). Please enlighten... My application is
> otherwise running..
>
> Thanking you,
> DJ
>
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