GTK+ Forums

Mk27 · GTK+ Guru Joined: 07 Aug 2008 Posts: 100 Location: NYC

I came up with this because I wanted a toggle button for starting/stopping a server, but with something more substantially visual to indicate the toggle is depressed and the server is up and running.

The demo here uses xpm images for simplicity, but if you use a higher quality png it looks pretty sharp. It starts with a normal button; when you click it, a flashing light replaces the button. Click on the light to get the button back. Alternately, you could just leave the image of the light off and not use a labelled button at all (or use a third image, like a little globe, clock, etc.)

The button used is not actually a toggle, but the blinkbutton struct has a "status" member that can be used the same way you would check a toggle's state. In the demo, toggling the button doesn't do anything but start the light flashing; in implimentation you would want to add some further purpose in the toggle_indicator() function.

I put the struct spec and functions in a seperate header to the demo program for convenience. A second header contains the xpm images for the demo.

Code: (C)

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#include <gtk/gtk.h>
#include "indicator.h"
#include "images.h" /* the xpm's */

int main () {
GdkPixbuf *pbuf;
GtkWidget *window, *button, *on1_img, *on2_img, *blab;
blinkbutton mybutton;

gtk_init (NULL,NULL);

/*initialize images*/
pbuf=gdk_pixbuf_new_from_xpm_data((const char**)on1_xpm);
on1_img=gtk_image_new_from_pixbuf(pbuf);
g_object_ref(G_OBJECT(on1_img)); /* add one to the reference count */
pbuf=gdk_pixbuf_new_from_xpm_data((const char**)on2_xpm); /* otherwise the widget will get */
on2_img=gtk_image_new_from_pixbuf(pbuf); /* deleted the first time it's removed */
g_object_ref(G_OBJECT(on2_img));

window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_main_quit), NULL);
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
gtk_window_set_title(GTK_WINDOW (window), "GtkIndicator");

button = gtk_button_new(); /* don't use _with_label because the */
blab=gtk_label_new("click"); /* label must be a seperate widget */
g_object_ref(G_OBJECT(blab)); /* add one to the reference count here too */
mybutton.wgt=button; mybutton.lab=blab; mybutton.image1=on1_img; mybutton.image2=on2_img; mybutton.status=0;
/* see indicator.h for the struct spec...define everything but blinkbutton.timer */
gtk_container_add(GTK_CONTAINER(mybutton.wgt),mybutton.lab);
gtk_container_add(GTK_CONTAINER(window),button);
g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(toggle_indicator),&mybutton);

gtk_widget_show(on1_img); /* the images are not contained in the window */
gtk_widget_show(on2_img); /* so must be realized seperately */
gtk_widget_show_all (window);

gtk_main ();

return 0;
}

indicator.h

Code: (C)

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#include <gtk/gtk.h>

typedef struct _blink_button blinkbutton;
struct _blink_button {
GtkWidget *wgt; /*the button*/
GtkWidget *lab; /*the button label*/
GtkWidget *image1; /*first image of blink*/
GtkWidget *image2; /*second*/
short int status; /*contents of button: 0=lab,1=image1,2=image2*/
guint timer; /*the g_timeout*/
};

gboolean flashblink (blinkbutton *button) {
if (button->status==1) {
gtk_container_remove(GTK_CONTAINER(button->wgt),button->image1);
gtk_container_add(GTK_CONTAINER(button->wgt),button->image2);
button->status=2;
} else {
gtk_container_remove(GTK_CONTAINER(button->wgt),button->image2);
gtk_container_add(GTK_CONTAINER(button->wgt),button->image1);
button->status=1;
}
return TRUE;
}

void toggle_indicator (GtkWidget *widget, blinkbutton *button) {
if (button->status==0) { /*toggle on*/
gtk_container_remove(GTK_CONTAINER(button->wgt),button->lab);
gtk_button_set_relief(GTK_BUTTON(button->wgt),GTK_RELIEF_NONE);
button->status=1;
gtk_container_add(GTK_CONTAINER(button->wgt),button->image1);
button->timer=g_timeout_add((750), (GSourceFunc)flashblink, button);
} else { /*toggle off*/
g_source_remove(button->timer);
/* remove the correct image*/
if (button->status == 1) gtk_container_remove(GTK_CONTAINER(button->wgt),button->image1);
else gtk_container_remove(GTK_CONTAINER(button->wgt),button->image2);
button->status=0;
gtk_button_set_relief(GTK_BUTTON(button->wgt),GTK_RELIEF_NORMAL);
gtk_container_add(GTK_CONTAINER(button->wgt),button->lab);
}
}

images.h

Code: (C)

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/* XPM */
static char * on1_xpm[] = {
"20 20 54 1",
" c None",
". c #D02C10",
"+ c #CB210C",
"@ c #C61708",
"# c #C21207",
"$ c #C31207",
"% c #C51708",
"& c #CA210C",
"* c #C81D0A",
"= c #B80803",
"- c #A90100",
"; c #9C0000",
"> c #950000",
", c #C11206",
"' c #AA0201",
") c #900000",
"! c #7C0000",
"~ c #6E0000",
"{ c #680000",
"] c #6D0000",
"^ c #C21206",
"/ c #A20000",
"( c #820000",
"_ c #660000",
": c #590000",
"< c #530000",
"[ c #510000",
"} c #AB0201",
"| c #630000",
"1 c #4B0000",
"2 c #460000",
"3 c #430000",
"4 c #420000",
"5 c #450000",
"6 c #4C0000",
"7 c #C81C0A",
"8 c #480000",
"9 c #3F0000",
"0 c #370000",
"a c #340000",
"b c #330000",
"c c #380000",
"d c #540000",
"e c #7D0000",
"f c #2B0000",
"g c #260000",
"h c #1F0000",
"i c #180000",
"j c #170000",
"k c #0C0000",
"l c #500000",
"m c #960000",
"n c #0B0000",
"o c #CB210B",
" ",
" .+@#$%&. ",
" *=-;>>;-=* ",
" ,')!~{{]!)'^ ",
" ^/(_:<[[<:_(/^ ",
" *}(|<123456<|(}7 ",
" .=)_<890abc98d_)=. ",
" +-e:69afggfa96:e-+ ",
" %;~<20fhijhf02<~;% ",
" $>{[3agjkkjga4l{m$ ",
" $m{[3bgjknjga3[{>$ ",
" %;]<50fhjjhf02<~;% ",
" o-e:19afggfa96:!-& ",
" .=)_<890aa098d_)=. ",
" 7'(|<623326d|(}7 ",
" ^/(_:<[l<:_(/, ",
" ,')!~{{~!)}^ ",
" *=-;mm;-=7 ",
" .&%$$%&. ",
" "};
/* XPM */
static char *on2_xpm[] = {
/* columns rows colors chars-per-pixel */
"20 20 114 2",
" c #753D00",
". c #763E00",
"X c #7B3E01",
"o c #7A3F01",
"O c #7B3F01",
"+ c #7F3E01",
"@ c #505F02",
"# c #555D02",
"$ c #5E5C01",
"% c #5F5C01",
"& c #694600",
"* c #684700",
"= c #624F01",
"- c #634F01",
"; c #794001",
": c #7A4001",
"> c #714B01",
", c #714C01",
"< c #635801",
"1 c #635901",
"2 c #4D6501",
"3 c #4F6702",
"4 c #4F6A02",
"5 c #506002",
"6 c #536602",
"7 c #536702",
"8 c #437702",
"9 c #447702",
"0 c #4B7102",
"q c #4B7202",
"w c #487A03",
"e c #8A2F00",
"r c #902F00",
"t c #922E01",
"y c #8C3701",
"u c #8D3701",
"i c #813800",
"p c #823800",
"a c #803D01",
"s c #833D01",
"d c #843D01",
"f c #8C3A01",
"g c #8D3A01",
"h c #903000",
"j c #9E3203",
"k c #A22B03",
"l c #AC2F06",
"z c #AD2F06",
"x c #A73706",
"c c #AB3307",
"v c #AC3207",
"b c #A83706",
"n c #AE3607",
"m c #AF3607",
"M c #B03307",
"N c #B03407",
"B c #B53407",
"V c #B53507",
"C c #B13A07",
"Z c #B13B07",
"A c #B53B09",
"S c #B73A08",
"D c #B63A09",
"F c #B73A09",
"G c #B33E09",
"H c #B43E09",
"J c #B14009",
"K c #B8460D",
"L c #B9470D",
"P c #B44E0D",
"I c #B3510D",
"U c #B2510E",
"Y c #3E8603",
"T c #3F8603",
"R c #3E8B02",
"E c #3B9703",
"W c #3C9503",
"Q c #3D9503",
"! c #3C9703",
"~ c #3A9A03",
"^ c #3B9A03",
"/ c #3C9A03",
"( c #3C9B03",
") c #38A303",
"_ c #38A304",
"` c #35AA04",
"' c #36B304",
"] c #34B704",
"[ c #33BD04",
"{ c #34BD04",
"} c #418703",
"| c #33C204",
" . c #32C304",
".. c #33C305",
"X. c #32C405",
"o. c #31C705",
"O. c #32C704",
"+. c #32C805",
"@. c #2FD905",
"#. c #2FDA05",
"$. c #30D605",
"%. c #2FE305",
"&. c #2FE006",
"*. c #2FE306",
"=. c #2FE605",
"-. c #2FE706",
";. c #2FEA06",
":. c #2EED06",
">. c #2EF306",
",. c #2EF406",
"<. c #2EF506",
"1. c #2EF706",
"2. c #2EF806",
"3. c None",
/* pixels */
"3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.",
"3.3.3.3.3.3.P H m c v v F K 3.3.3.3.3.3.",
"3.3.3.3.3.Z j y s ; o + h k V 3.3.3.3.3.",
"3.3.3.3.x f , % 6 4 3 # - . t z 3.3.3.3.",
"3.3.3.b s < 0 } E ~ E R 9 5 * e z 3.3.3.",
"3.3.Z f < w ( ' | o. .] ) Y 3 * t B 3.3.",
"3.P j , 0 ( [ $.*.=.*.@.o.` Y # . k L 3.",
"3.H y % } ' $.;.>.>.>.>.#.o.) 8 - h F 3.",
"3.n + 6 ! .*.>.1.1.1.1.:.@.] R # i v 3.",
"3.c ; 4 E o.=.>.2.2.2.1.>.*. .E 3 o v 3.",
"3.v o 6 E .=.>.1.1.1.2.1.-.o.~ 4 ; v 3.",
"3.N i # R ] @.:.1.1.2.2.>.*. .Q 7 s n 3.",
"3.F h - 8 _ o.#.:.>.1.>.;.$.' } % y H 3.",
"3.K k . 2 T ` o.@.*.-.*.$.{ ( 0 > j P 3.",
"3.3.V t * 2 T _ ] .+. .' ( w < f C 3.3.",
"3.3.3.z e * # 9 R ! ~ Q } 0 < d x 3.3.3.",
"3.3.3.3.v t . - # 4 4 6 % > f b 3.3.3.3.",
"3.3.3.3.3.V k e i + o + y j Z 3.3.3.3.3.",
"3.3.3.3.3.3.L F N v v N J P 3.3.3.3.3.3.",
"3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3."
};