edn/tools/exampleCustumWidget/Sources/cpu.c

/* cpu.c */

#include "cpu.h"


static void gtk_cpu_class_init(GtkCpuClass *klass);
static void gtk_cpu_init(GtkCpu *cpu);
static void gtk_cpu_size_request(GtkWidget *widget, GtkRequisition *requisition);
static void gtk_cpu_size_allocate(GtkWidget *widget, GtkAllocation *allocation);
static void gtk_cpu_realize(GtkWidget *widget);
static gboolean gtk_cpu_expose(GtkWidget *widget, GdkEventExpose *event);
static void gtk_cpu_paint(GtkWidget *widget);
static void gtk_cpu_destroy(GtkObject *object);


GtkType gtk_cpu_get_type(void)
{
  static GtkType gtk_cpu_type = 0;

  if (!gtk_cpu_type) {
      static const GtkTypeInfo gtk_cpu_info = {
          "GtkCpu",
          sizeof(GtkCpu),
          sizeof(GtkCpuClass),
          (GtkClassInitFunc) gtk_cpu_class_init,
          (GtkObjectInitFunc) gtk_cpu_init,
          NULL,
          NULL,
          (GtkClassInitFunc) NULL
      };
      gtk_cpu_type = gtk_type_unique(GTK_TYPE_WIDGET, &gtk_cpu_info);
  }


  return gtk_cpu_type;
}

void gtk_cpu_set_state(GtkCpu *cpu, gint num)
{
   cpu->sel = num;
   gtk_cpu_paint(GTK_WIDGET(cpu));
}


GtkWidget * gtk_cpu_new()
{
   return GTK_WIDGET(gtk_type_new(gtk_cpu_get_type()));
}


static void gtk_cpu_class_init(GtkCpuClass *klass)
{
  GtkWidgetClass *widget_class;
  GtkObjectClass *object_class;


  widget_class = (GtkWidgetClass *) klass;
  object_class = (GtkObjectClass *) klass;

  widget_class->realize = gtk_cpu_realize;
  widget_class->size_request = gtk_cpu_size_request;
  widget_class->size_allocate = gtk_cpu_size_allocate;
  widget_class->expose_event = gtk_cpu_expose;

  object_class->destroy = gtk_cpu_destroy;
}


static void gtk_cpu_init(GtkCpu *cpu)
{
   cpu->sel = 0;
}


static void gtk_cpu_size_request(GtkWidget *widget,
    GtkRequisition *requisition)
{
  g_return_if_fail(widget != NULL);
  g_return_if_fail(GTK_IS_CPU(widget));
  g_return_if_fail(requisition != NULL);

  requisition->width = 80;
  requisition->height = 100;
}


static void gtk_cpu_size_allocate(GtkWidget *widget,
    GtkAllocation *allocation)
{
  g_return_if_fail(widget != NULL);
  g_return_if_fail(GTK_IS_CPU(widget));
  g_return_if_fail(allocation != NULL);

  widget->allocation = *allocation;

  if (GTK_WIDGET_REALIZED(widget)) {
     gdk_window_move_resize(
         widget->window,
         allocation->x, allocation->y,
         allocation->width, allocation->height
     );
   }
}


static void gtk_cpu_realize(GtkWidget *widget)
{
  GdkWindowAttr attributes;
  guint attributes_mask;

  g_return_if_fail(widget != NULL);
  g_return_if_fail(GTK_IS_CPU(widget));

  GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = 80;
  attributes.height = 100;

  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.event_mask = gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y;

  widget->window = gdk_window_new(
     gtk_widget_get_parent_window (widget),
     & attributes, attributes_mask
  );

  gdk_window_set_user_data(widget->window, widget);

  widget->style = gtk_style_attach(widget->style, widget->window);
  gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);
}


static gboolean gtk_cpu_expose(GtkWidget *widget, GdkEventExpose *event)
{
  g_return_val_if_fail(widget != NULL, FALSE);
  g_return_val_if_fail(GTK_IS_CPU(widget), FALSE);
  g_return_val_if_fail(event != NULL, FALSE);

  gtk_cpu_paint(widget);

  return FALSE;
}


static void gtk_cpu_paint(GtkWidget *widget)
{
  cairo_t *cr;

  cr = gdk_cairo_create(widget->window);

  cairo_translate(cr, 0, 7);

  cairo_set_source_rgb(cr, 0, 0, 0);
  cairo_paint(cr);

  gint pos = GTK_CPU(widget)->sel;
  gint rect = pos / 5;

  cairo_set_source_rgb(cr, 0.2, 0.4, 0);

  gint i;
  for ( i = 1; i <= 20; i++) {
      if (i > 20 - rect) {
          cairo_set_source_rgb(cr, 0.6, 1.0, 0);
      } else {
          cairo_set_source_rgb(cr, 0.2, 0.4, 0);
      }
      cairo_rectangle(cr, 8, i*4, 30, 3);
      cairo_fill(cr);
      if (i > 20 - rect) {
          cairo_set_source_rgb(cr, 0.9, 1.0, 0);
      } else {
          cairo_set_source_rgb(cr, 0.4, 0.4, 0);
      }
      cairo_rectangle(cr, 42, i*4, 30, 3);
      cairo_fill(cr);
  }

  cairo_destroy(cr);
}


static void gtk_cpu_destroy(GtkObject *object)
{
  GtkCpu *cpu;
  GtkCpuClass *klass;

  g_return_if_fail(object != NULL);
  g_return_if_fail(GTK_IS_CPU(object));

  cpu = GTK_CPU(object);
/*
  klass = gtk_type_class( gtk_widget_get_type() );

  if (GTK_OBJECT_CLASS(klass)->destroy) {
     (* GTK_OBJECT_CLASS(klass)->destroy) (object);
  }
*/
}