yeajchao wrote: > > However, the need for some applications to use fixed colours like > > green, yellow and red to indicate things like error-free results, > > warnings, error messages or critical choices / operations is > > recognized. That's why you can rather easily change colours and > > appearances of texts on screen. See the following URL for an > > overview of how to change text appearances of markup-enabled widgets > > even easier than tweaking themes: > > First,thank you very much for your advice > As you say, I want to use the radio button as a alarm, > Usually,alarm's color is red > My application controls some peripheral instrument, > when my application detected some one broken down > the alarm will be flicker with red color > > I am a beginer of gtk, also beginer of program,so I have no other > idea to resolve the problem > Will you be so kind as to give some advice ?
First: you really should forget about manually recolouring the knobs of radiobuttons, checkboxes and other controls. Recolouring just texts is sufficient for this purpose and can be accomplished almost easily. To make text(s) in dialogs flicker there are about four steps to be taken. I assume you have your standard GtkRadiobutton* (the one to be recoloured) within reach. In this example I will call it "rb_flicker": 1. learn about Pango's simple markup to apply custom colours (and other styles) to labels. See: http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html 2. obtain the GtkLabel that is (usually) associated with a GtkRadiobutton. The simpliest way to get it is about this: label_flicker = gtk_bin_get_child (GTK_BIN (rb_flicker)); See: http://developer.gnome.org/doc/API/2.0/gtk/GtkBin.html#gtk-bin-get-child 3. use gtk_label_set_markup() to change the appearance of the label once, something like this: gtk_label_set_markup (label_flicker, "<span foreground=\"red\">This is critical</span>"); See: http://developer.gnome.org/doc/API/2.0/gtk/GtkLabel.html#gtk-label-set-markup 4. to actually achieve a flicker effect (periodically changing appearance) you manually have to change the markup text of the label periodically. There are no automatic means to achieve any sort of animation in GTK+. Use one of gtk_timeout_add() or g_timeout_add() to register a simple function which periodically switches between two (or more) states of the label, like 1. "<span foreground=\"red\">This is critical</span>" and 2. "This is critical". This switches between red and default colour of the text. Upon registration, this simple markup changer function should receive the GtkLabel of the GtkRadiobutton as its data, like this: gtk_timeout_add (500, func_flicker, label_flicker); See: http://developer.gnome.org/doc/API/2.0/gtk/gtk-General.html#gtk-timeout-add http://developer.gnome.org/doc/API/2.0/glib/glib-The-Main-Event-Loop.html#g-timeout-add Notes: Step 2, as described here, assumes you are using a simple radiobutton, that is, a GtkRadiobutton with exactly one GtkLabel attached to it. GTK+ also supports more complex radiobuttons which have containers and multiple children, i.e. images, attached to them, instead of just a simple GtkLabel. In that case locating the GtkLabel would require some more efforts. Step 4: it is up to you to take care to stop the periodically called timeout function. For instance, when the dialog that contains the flickering radiobutton gets destroyed, the flicker function MUST NOT continue to try changing the appearance of the radiobutton's label any more. Removal of your timeout fucntion does not happen automatically! After all I'd like to repeat: you shouldn't play with the appearance of GTK+ widgets in a custom, non-themable way unless absolutely required! _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
