fontbutton.c

来自「开发linux应用-用gtk+和gdk开发linux图形用户界面应用－－的实例」· C语言 代码 · 共 168 行

/*
 * File: fontbutton.c
 *
 */
#include <gtk/gtk.h>
#include <stdlib.h>

GtkWidget *button;
GtkWidget *vbox;

gchar *GetFont ();


/*
 * NewStyle
 *
 * Create a style with the new font
 */
GtkStyle *NewStyle (GdkFont *f)
{
    GtkStyle *style;
    GtkStyle *defstyle;

    /* --- Get the default style --- */
    defstyle = gtk_widget_get_default_style ();

    /* --- Make a copy of it. --- */
    style = gtk_style_copy (defstyle);

    style->font = f;

    /* --- return the style --- */
    return (style);
}


/*
 * CloseAppWindow
 *
 * Close down the application
 */
gint CloseAppWindow (GtkWidget *widget, gpointer gdata)
{
    g_print ("Quitting...\n");
    gtk_main_quit ();
    return (FALSE);
}


/*
 * SetStyleRecursively
 *
 * Set the style on the current widget and on any 
 * children widgets.
 */
void SetStyleRecursively (GtkWidget *widget, gpointer data)
{
    GtkStyle *style;

    /* --- Get the style --- */
    style = (GtkStyle *) data;

    /* --- Set style on current widget --- */
    gtk_widget_set_style (widget, style);

    /* --- If it has other widgets --- */
    if (GTK_IS_CONTAINER (widget)) {

        /* --- Set the style on those widgets too --- */
        gtk_container_foreach (GTK_CONTAINER (widget), 
                           SetStyleRecursively, style);
    }
}


/*
 * button_was_clicked
 * 
 * event handler called when the button is clicked.
 * We can do this because the font dialog is modal here 
 * and doesn't return until a font is retrieved.
 */
void ButtonClicked (GtkWidget *widget, gpointer gdata)
{
    GtkStyle *style;
    char *szFont;
    GdkFont *font;

    /* --- Call the font dialog to get a font --- */
    szFont = GetFont ();

    printf ("GetFont=%s\n", szFont);
    font = gdk_font_load (szFont);
    g_free (szFont);

    /* --- Create a style based on the font --- */
    style = NewStyle (font);

    /* --- Set the style of the wiget based on that new style */
    SetStyleRecursively (widget, (gpointer) style);
}

/*
 * CreateButton
 *
 * Create a button and add it to the vbox.  Setup the 
 * event handler to "ButtonClicked"
 */
void CreateButton (GtkWidget *vbox, char *label)
{
    GtkWidget *button;

    /* --- Create a button --- */
    button = gtk_button_new_with_label (label);

    gtk_signal_connect (GTK_OBJECT (button), "clicked", 
                GTK_SIGNAL_FUNC (ButtonClicked), NULL);

    /* --- The main windows contains the button.  --- */
    gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

    /* --- Make the button visible --- */
    gtk_widget_show (button);
}


/*
 * main
 *
 * Program begins here.
 */
int main (int argc, char *argv[]) 
{
    GtkWidget *window;

    /* --- Initialize gtk, handle command line parameters --- */
    gtk_init (&argc, &argv);

    /* --- Create a window --- */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

    /* --- Need to know when window closes --- */
    gtk_signal_connect (GTK_OBJECT (window), "delete_event", 
                GTK_SIGNAL_FUNC (CloseAppWindow), NULL);
    
    /* --- Put some room around objects in the container --- */
    gtk_container_border_width (GTK_CONTAINER (window), 15);

    /* --- Create vertical packing box --- */
    vbox = gtk_vbox_new (FALSE, 0);

    /* --- Create buttons --- */
    CreateButton (vbox, "Pick Font");
    CreateButton (vbox, "The fox jumped over the lazy dog");

    /* --- Now, make the window visible --- */
    gtk_widget_show (vbox);
    gtk_container_add (GTK_CONTAINER (window), vbox);
    gtk_widget_show (window);

    /* --- Do not return until "quit" --- */
    gtk_main ();

    /* --- Exit status code. --- */
    return 0;
}