Re: TEXT over transparent background

[Julio Pastrana <pastrana informatik uni-freiburg de>]

Hello again Ariel
well I changed  some things from
the example and I add a line that does
magic .. just to mask the whole window

 gtk_widget_shape_combine_mask( window, xpm, 0, 0 );

it is explained in theWheelbarrow (i think)

OK other thing
try this 2 types of windows

window = gtk_window_new( GTK_WINDOW_TOPLEVEL);

window = gtk_window_new( GTK_WINDOW_POPUP );

just replace  GTK_WINDOW_TOPLEVEL for GTK_WINDOW_POPUP
or viseversa ... and check the efect

i hope you ca understand this one  =)
heve fun


-------------------------------------------------------
#include <gtk/gtk.h>
#include <stdlib.h>

void close_application( GtkWidget *widget, GdkEvent
*event, gpointer data ) {
    gtk_main_quit();
}

int main (int argc, char *argv[])
{
           //widgets we will show
       GtkWidget *window, *pixmap;

           // just to define colors
        GdkGC *gccc;
        GdkGC *gc;
        GdkColor white;
        GdkColor black;

           GdkPixmap   *p;       // this is the color pixmap
        GdkPixmap *xpm; //this is the mask
        GdkFont *label_font=NULL; // to store the text you want to draw

        GtkWidget *vbox1;


    int sizeX = 300;
    int sizeY = 100;


    gtk_init (&argc, &argv);



    window = gtk_window_new( GTK_WINDOW_TOPLEVEL);  // window = gtk_window_new( GTK_WINDOW_POPUP );
    gtk_widget_set_usize (window,  sizeX ,  sizeY);
    gtk_signal_connect (GTK_OBJECT (window), "delete_event",
                        GTK_SIGNAL_FUNC (close_application), NULL);
    gtk_widget_show (window);


    vbox1 = gtk_vbox_new (FALSE, 0);
    gtk_widget_set_name (vbox1, "vbox1");
    gtk_widget_ref (vbox1);
    gtk_object_set_data_full (GTK_OBJECT (window), "vbox1", vbox1,
                             (GtkDestroyNotify) gtk_widget_unref);
    gtk_container_add (GTK_CONTAINER (window), vbox1);
    gtk_widget_show (vbox1);


         gdk_color_parse("white", &white);
         gdk_color_alloc(gtk_widget_get_colormap(window),&white);

         gdk_color_parse("black", &black);
         gdk_color_alloc(gtk_widget_get_colormap(window),&black);




           p =  gdk_pixmap_new ( window->window, sizeX,sizeY, -1);  //creating color pixmap
           xpm = gdk_pixmap_new ( NULL, sizeX, sizeY,1);   //creating  one color pixmap (It is actually a 
BITMAP)

          // getting the gc for the bitmap 1 bit color
           gc = gdk_gc_new(xpm);
           gdk_gc_set_foreground(gc, &black);
           gdk_draw_rectangle(xpm, gc, TRUE, 0,0, sizeX,sizeY);
           gdk_gc_set_foreground(gc, &white);



                  /* everything you draw you have to draw it on the mask also */
                  /* just with the white color */

                   // getting the gc for the pixmap
                   gccc = gdk_gc_new(p);
                  gdk_gc_set_background(gccc, &white);
                  gdk_draw_rectangle(p, gccc, TRUE, 0,0,  sizeX,sizeY);

                  label_font = gdk_font_load("-*-helvetica-*-r-normal-*-14-*-*-*-*-*-*-*");
                  char * text = "Ventana Transparente";
                  gdk_draw_string(p , label_font , gccc , 30, 30, text);
                  gdk_draw_string(xpm , label_font , gc , 30, 30, text);


        //as in the Wheelbarrow example
        //we need to send the pixmap "p" to a pixmap Widget
        //and we mask it with the bitmap xpm
         pixmap = gtk_pixmap_new( p, xpm);

                 //now we do not need the pixmap
                 //because the widget has the data
                 //and we free the memory of the pixmap and the bitmap
                  gdk_pixmap_unref(p);
                  gdk_pixmap_unref(xpm);

         //attaching the widget to a vbox
         gtk_container_add( GTK_CONTAINER(vbox1),  pixmap);
         gtk_widget_show( pixmap );

        /* This masks out everything except for the image itself */
         gtk_widget_shape_combine_mask( window, xpm, 0, 0 );
         gtk_widget_show( pixmap );

    gtk_main ();

    return 0;
}




-------------------------------------------------------


On Thu, 23 Oct 2003, Ariel Fritz wrote:

> Thanks for information
>
> I really tryed to understand your code but I couldn´t at all.
> I´m very beginer in GTK, and I don´t know some of functions that you use in
> code.
> I´ll explain my doubts and my needs.
>
> I realy need to show a text on over any window. This text should be holded
> in another window with tranparent background. Image TV menu labels.
>
> I was taking a look in wheelbarrow.c example that came with GTK and your
> example. But I couldn´t get any good results.
>
> If you can help me I´ll thank you.
>
> Ariel Antonio Fritz
> --- Original Message -----
> From: "Julio Pastrana" <pastrana informatik uni-freiburg de>
> To: "Ariel Fritz" <duin tutopia com>
> Cc: <gtk-app-devel-list gnome org>
> Sent: Thursday, October 23, 2003 5:31 AM
> Subject: Re: TEXT over transparent background