Re: How to get the pixmap's position?

[Olexiy Avramchenko <ath beast stu cn ua>]

anukeey wrote:

> Hi all:
>   I had designed a GtkPixmap widget, and set eventbox
> for the pixmap widget, now I captured the button ress
> event when user clicked the pixmap to load another
> pixmap. As we know, the pixmap widget is rectangle
> shape, but the pixmap that we loaded may be polygon
> shape, so how to make sure the mouse pointer is only
> on the top of pixmap not the else part of pixmap
> widget?
The first quick suggestion:
You can create the shaped window (with mask from your pixmap)
and connect to "button_press_event". The event will not be sent
if you push the button outside your pixmap. Take a look at attach -
i slightly changed the "wheelbarrow" example in this way.

The second suggestion:
Look at the nautilus sources - I see the icons on my gnome-1.4 desktop
interacting in such a way, but 'xwininfo' doesnt show any windows on them.
(btw: I dont like such icons, because I need to move mouse pointer precisely
on image)

Olexiy

#include <stdio.h>
#include <gtk/gtk.h>

/* XPM */
static char * WheelbarrowFull_xpm[] = {
"48 48 64 1",
"       c None",
".      c #DF7DCF3CC71B",
"X      c #965875D669A6",
"o      c #71C671C671C6",
"O      c #A699A289A699",
"+      c #965892489658",
"@      c #8E38410330C2",
"#      c #D75C7DF769A6",
"$      c #F7DECF3CC71B",
"%      c #96588A288E38",
"&      c #A69992489E79",
"*      c #8E3886178E38",
"=      c #104008200820",
"-      c #596510401040",
";      c #C71B30C230C2",
":      c #C71B9A699658",
">      c #618561856185",
",      c #20811C712081",
"<      c #104000000000",
"1      c #861720812081",
"2      c #DF7D4D344103",
"3      c #79E769A671C6",
"4      c #861782078617",
"5      c #41033CF34103",
"6      c #000000000000",
"7      c #49241C711040",
"8      c #492445144924",
"9      c #082008200820",
"0      c #69A618611861",
"q      c #B6DA71C65144",
"w      c #410330C238E3",
"e      c #CF3CBAEAB6DA",
"r      c #71C6451430C2",
"t      c #EFBEDB6CD75C",
"y      c #28A208200820",
"u      c #186110401040",
"i      c #596528A21861",
"p      c #71C661855965",
"a      c #A69996589658",
"s      c #30C228A230C2",
"d      c #BEFBA289AEBA",
"f      c #596545145144",
"g      c #30C230C230C2",
"h      c #8E3882078617",
"j      c #208118612081",
"k      c #38E30C300820",
"l      c #30C2208128A2",
"z      c #38E328A238E3",
"x      c #514438E34924",
"c      c #618555555965",
"v      c #30C2208130C2",
"b      c #38E328A230C2",
"n      c #28A228A228A2",
"m      c #41032CB228A2",
"M      c #104010401040",
"N      c #492438E34103",
"B      c #28A2208128A2",
"V      c #A699596538E3",
"C      c #30C21C711040",
"Z      c #30C218611040",
"A      c #965865955965",
"S      c #618534D32081",
"D      c #38E31C711040",
"F      c #082000000820",
"                                                ",
"          .XoO                                  ",
"         + #$%o&                                ",
"         *=-;#::o+                              ",
"           >,<12#:34                            ",
"             45671#:X3                          ",
"               +89<02qwo                        ",
"e*                >,67;ro                       ",
"ty>                 459@>+&&                    ",
"$2u+                  ><ipas8*                  ",
"%$;=*                *3:.Xa.dfg>                ",
"Oh$;ya             *3d.a8j,Xe.d3g8+             ",
" Oh$;ka          *3d$a8lz,,xxc:.e3g54           ",
"  Oh$;kO       *pd$%svbzz,sxxxxfX..&wn>         ",
"   Oh$ mO    *3dthwlsslszjzxxxxxxx3:td8M4       ",
"    Oh$ g& *3d$XNlvvvlllm,mNwxxxxxxxfa.:,B*     ",
"     Oh$@,Od czlllllzlmmqV V#V@fxxxxxxxf:%j5&   ",
"      Oh$1hd5lllslllCCZrV#r#:#2AxxxxxxxxxcdwM*  ",
"       OXq6c.%8vvvllZZiqqApA:mq:Xxcpcxxxxxfdc9* ",
"        2r<6gde3bllZZrVi7S SV77A::qApxxxxxxfdcM ",
"        :,q-6MN.dfmZZrrSS:#riirDSAX Af5xxxxxfevo",
"         +A26jguXtAZZZC7iDiCCrVVii7Cmmmxxxxxx%3g",
"          *#16jszN..3DZZZZrCVSA2rZrV7Dmmwxxxx&en",
"           p2yFvzssXe:fCZZCiiD7iiZDiDSSZwwxx8e*>",
"           OA1<jzxwwc:$d%NDZZZZCCCZCCZZCmxxfd.B ",
"            3206Bwxxszx%et.eaAp77m77mmmf3&eeeg* ",
"             @26MvzxNzvlbwfpdettttttttttt.c,n&  ",
"             *;16=lsNwwNwgsvslbwwvccc3pcfu<o    ",
"              p;<69BvwwsszslllbBlllllllu<5+     ",
"              OS0y6FBlvvvzvzss,u=Blllj=54       ",
"               c1-699Blvlllllu7k96MMMg4         ",
"               *10y8n6FjvllllB<166668           ",
"                S-kg+>666<M<996-y6n<8*          ",
"                p71=4 m69996kD8Z-66698&&        ",
"                &i0ycm6n4 ogk17,0<6666g         ",
"                 N-k-<>     >=01-kuu666>        ",
"                 ,6ky&      &46-10ul,66,        ",
"                 Ou0<>       o66y<ulw<66&       ",
"                  *kk5       >66By7=xu664       ",
"                   <<M4      466lj<Mxu66o       ",
"                   *>>       +66uv,zN666*       ",
"                              566,xxj669        ",
"                              4666FF666>        ",
"                               >966666M         ",
"                                oM6668+         ",
"                                  *4            ",
"                                                ",
"                                                "};


/* When invoked (via signal delete_event), terminates the application */
gint close_application( GtkWidget *widget,
                        GdkEvent  *event,
                        gpointer   data )
{
    gtk_main_quit();
    return(FALSE);
}

gboolean button_press(GtkWidget *widget, GdkEventButton *event)
{
	printf("%d pressed at %.0fx%.0f\n", event->button, event->x,event->y);
	return TRUE;
}

int main (int argc,
          char *argv[] )
{
    /* GtkWidget is the storage type for widgets */
    GtkWidget *window, *pixmap, *fixed;
    GdkPixmap *gdk_pixmap;
    GdkBitmap *mask;
    GtkStyle *style;
    GdkGC *gc;
    
    /* Create the main window, and attach delete_event signal to terminate
     * the application.  Note that the main window will not have a titlebar
     * since we're making it a popup. */
    gtk_init (&argc, &argv);
    window = gtk_window_new (GTK_WINDOW_POPUP);
    g_signal_connect (G_OBJECT (window), "delete_event",
                      G_CALLBACK (close_application), NULL);

/* setting event mask */
    gtk_widget_add_events(window, GDK_BUTTON_PRESS_MASK);
/* connecting signal */
    g_signal_connect(G_OBJECT(window), "button_press_event", G_CALLBACK(button_press), NULL);

    gtk_widget_show (window);

    /* Now for the pixmap and the pixmap widget */
    style = gtk_widget_get_default_style();
    gc = style->black_gc;
    gdk_pixmap = gdk_pixmap_create_from_xpm_d (window->window, &mask,
                                               &style->bg[GTK_STATE_NORMAL],
                                               WheelbarrowFull_xpm);
    pixmap = gtk_image_new_from_pixmap (gdk_pixmap, mask);
    gtk_widget_show (pixmap);

    /* To display the pixmap, we use a fixed widget to place the pixmap */
    fixed = gtk_fixed_new ();
    gtk_widget_set_size_request (fixed, 200, 200);
    gtk_fixed_put (GTK_FIXED (fixed), pixmap, 0, 0);
    gtk_container_add (GTK_CONTAINER (window), fixed);
    gtk_widget_show (fixed);

    /* This masks out everything except for the image itself */
    gtk_widget_shape_combine_mask (window, mask, 0, 0);
    
    /* show the window */
    gtk_widget_show (window);
    gtk_main ();
          
    return 0;
}