ex25_2.c

linux 高级编程的例子源码,包括了本书上的所有代码

/* filename: testfont.c */
#include <gtk/gtk.h>
#include <stdlib.h>

int font_state;

typedef
struct 
{
	GtkWidget *dialog;
	gchar *fontname;
}diafont;

void OnCancel(GtkWidget *widget,gpointer data)
{
        font_state=0;
	gtk_grab_remove(widget);
    if (data!=NULL)
	   gtk_widget_destroy(GTK_WIDGET(data));
}

void OnClose(GtkWidget *widget,gpointer data)
{
       gtk_widget_destroy(GTK_WIDGET(data));
       gtk_main_quit();
}
void OnExit(GtkWidget *widget,gpointer data)
{    
     gtk_main_quit();
}
 
void OnSelectedFont(GtkWidget *widget,diafont *fontinfo)
{
     
	GtkFontSelectionDialog *fs;
        font_state=1;
	fs=(GtkFontSelectionDialog*)fontinfo->dialog;
	
	/* get the dialog box and the color */
	fontinfo->fontname=gtk_font_selection_dialog_get_font_name(fs);

	gtk_widget_destroy(GTK_WIDGET(fs));
        
}

int  GetSelectedFont (gchar fontname[])
{
  GtkWidget *window;
  diafont *fontinfo;
  gchar buf[256];

  /* create a font selection dialog window */
  window=gtk_font_selection_dialog_new("选择字体");
  fontinfo=g_malloc(sizeof(diafont));
  fontinfo->dialog=window;
  fontinfo->fontname=fontname;
 
  gtk_signal_connect(GTK_OBJECT(window),"destroy",
  GTK_SIGNAL_FUNC(gtk_main_quit),NULL);			
  
 /* transfer function OnSelectedFont when Ok button is clicked */
  gtk_signal_connect(
	  GTK_OBJECT(GTK_FONT_SELECTION_DIALOG(window)->ok_button),"clicked",
	  GTK_SIGNAL_FUNC(OnSelectedFont),fontinfo);
   /* transfer function CloseDialog when Cancel button is clicked */
  gtk_signal_connect(
	  GTK_OBJECT(GTK_FONT_SELECTION_DIALOG(window)->cancel_button),"clicked",
	  GTK_SIGNAL_FUNC(OnCancel),window);
  
   gtk_widget_show(window);
  /* only this dialog window can be done now */
  gtk_grab_add(window);
  gtk_main();
  
  sprintf(fontname,"%s",fontinfo->fontname);

  return font_state;
}

GtkStyle *CreatStyleByFont(GdkFont *fn)
{
	GtkStyle *defausty;
	GtkStyle *sty;
			
	defausty=gtk_widget_get_default_style();
	sty=gtk_style_copy(defausty);
 
	sty->font = fn;
	return(sty);
}

void SetWidgetStyle(GtkWidget *widget,gpointer data)
{
	GtkStyle *style;
	style=(GtkStyle*)data;
      
        gtk_widget_set_style(widget,style);
        
	 if(GTK_IS_CONTAINER(widget))
	{		gtk_container_foreach(GTK_CONTAINER(widget),SetWidgetStyle,style);
	}
}

void OnSelect(GtkWidget *widget,gpointer gdata)
{
	GtkStyle *sty;
	GdkFont *font;
	gchar fontsz[256];

	/* transfer function GetSelectedFont to get a font */
	 if (GetSelectedFont(fontsz))
        {
			font=gdk_font_load(fontsz);

	   

	/* create a style */
	sty=CreatStyleByFont(font);
	/* transfer function SetWidgetStyle to set the style of the widget */
	SetWidgetStyle(GTK_WIDGET(gdata),(gpointer)sty);
       }
}
  	
int main(int argc, char *argv[])
{
  GtkWidget *dialog_window;
  GtkWidget *button1;  
  GtkWidget *button2; 
  GtkWidget *label; 
  
  gtk_init(&argc, &argv);
  /* create a dialog window */
  dialog_window=gtk_dialog_new();
  gtk_window_set_title(GTK_WINDOW(dialog_window),"字体试验");
  gtk_signal_connect(GTK_OBJECT(dialog_window),"destroy",
                    GTK_SIGNAL_FUNC(OnExit),NULL);			
  gtk_container_border_width(GTK_CONTAINER(dialog_window),10);
  /*GTK_WIDGET_SET_FLAGS(dialog_window,GTK_NO_WINDOW); */ 

  /* create "选择" and "关闭" buttons */
  button1=gtk_button_new_with_label("选择");
  button2=gtk_button_new_with_label("关闭");
  GTK_WIDGET_SET_FLAGS(button1,GTK_CAN_DEFAULT);
  GTK_WIDGET_SET_FLAGS(button2,GTK_CAN_DEFAULT);
  
  /* add the buttons to the dialog action_area */
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog_window)->action_area),
	                 button1,TRUE,TRUE,0);
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog_window)->action_area),
	                 button2,TRUE,TRUE,0);

  /* click "选择" button to transfer function OnSelect */
  gtk_signal_connect(GTK_OBJECT(button1),"clicked",
                    GTK_SIGNAL_FUNC(OnSelect),GTK_DIALOG(dialog_window)->vbox);		
  /* click "关闭" button to transfer function OnClose */
  gtk_signal_connect(GTK_OBJECT(button2),"clicked",
                    GTK_SIGNAL_FUNC(OnClose),dialog_window);			
  gtk_widget_show(button1);
  gtk_widget_show(button2);
  gtk_widget_grab_default(button1);
  
  /* create a label with message */
  label=gtk_label_new("请选择字体式样");
  gtk_misc_set_padding(GTK_MISC(label),10,10);
  /* add the label to the dialog box */
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog_window)->vbox),
	                 label,TRUE,TRUE,0);
  gtk_widget_show(label);
  gtk_widget_show(dialog_window);;
 
  gtk_main();
  return(0);
}