gtkzoom.c

   1 #include "gtkzoom.h"
   2
   3 struct _GtkZoomPrivate
   4 {
   5         int dummy;
   6 //  GtkWidget *child;
   7 };
   8
   9 static gboolean
  10 gtk_zoom_draw      (GtkWidget      *widget,
  11                                      cairo_t        *cr);
  12 static void
  13 gtk_zoom_size_allocate (GtkWidget     *widget, GtkAllocation *allocation);
  14 static void
  15 gtk_zoom_get_preferred_width (GtkWidget *widget,
  16                                  gint      *minimum,
  17                                  gint      *natural);
  18 static void
  19 gtk_zoom_get_preferred_height (GtkWidget *widget,
  20                                  gint      *minimum,
  21                                  gint      *natural);
  22
  23 G_DEFINE_TYPE (GtkZoom, gtk_zoom, GTK_TYPE_BIN)
  24
  25 static void
  26 gtk_zoom_class_init (GtkZoomClass *class)
  27 {
  28   GtkWidgetClass *widget_class = (GtkWidgetClass*) class;
  29
  30   widget_class->draw          = gtk_zoom_draw;
  31   widget_class->size_allocate = gtk_zoom_size_allocate;
  32   widget_class->get_preferred_width = gtk_zoom_get_preferred_width;
  33   widget_class->get_preferred_height = gtk_zoom_get_preferred_height;
  34
  35
  36   g_type_class_add_private (class, sizeof (GtkZoomPrivate));
  37 }
  38
  39 static void
  40 gtk_zoom_init (GtkZoom *zoom)
  41 {
  42   GtkZoomPrivate *priv;
  43
  44   zoom->priv = G_TYPE_INSTANCE_GET_PRIVATE (zoom,
  45                                            GTK_TYPE_ZOOM,
  46                                            GtkZoomPrivate);
  47   priv = zoom->priv;
  48 }
  49
  50 GtkWidget*
  51 gtk_zoom_new (void)
  52 {
  53   return g_object_new (GTK_TYPE_ZOOM, NULL);
  54 }
  55
  56
  57 static void
  58 gtk_zoom_size_allocate (GtkWidget     *widget, GtkAllocation *allocation)
  59 {
  60   GtkWidget *main_widget;
  61
  62   GTK_WIDGET_CLASS (gtk_zoom_parent_class)->size_allocate (widget, allocation);
  63
  64   main_widget = gtk_bin_get_child (GTK_BIN (widget));
  65   if (!main_widget || !gtk_widget_get_visible (main_widget))
  66     return;
  67
  68   gtk_widget_size_allocate (main_widget, allocation);
  69 }
  70
  71 static void
  72 gtk_zoom_get_preferred_width (GtkWidget *widget,
  73                                  gint      *minimum,
  74                                  gint      *natural)
  75 {
  76   GtkBin *bin = GTK_BIN (widget);
  77   GtkWidget *child;
  78
  79   if (minimum)
  80     *minimum = 0;
  81
  82   if (natural)
  83     *natural = 0;
  84
  85   child = gtk_bin_get_child (bin);
  86   if (child && gtk_widget_get_visible (child))
  87     gtk_widget_get_preferred_width (child, minimum, natural);
  88 }
  89
  90 static void
  91 gtk_zoom_get_preferred_height (GtkWidget *widget,
  92                                   gint      *minimum,
  93                                   gint      *natural)
  94 {
  95   GtkBin *bin = GTK_BIN (widget);
  96   GtkWidget *child;
  97
  98   if (minimum)
  99     *minimum = 0;
 100
 101   if (natural)
 102     *natural = 0;
 103
 104   child = gtk_bin_get_child (bin);
 105   if (child && gtk_widget_get_visible (child))
 106     gtk_widget_get_preferred_height (child, minimum, natural);
 107 }
 108
 109
 110
 111 static gboolean
 112 gtk_zoom_draw (GtkWidget *widget, cairo_t   *cr)
 113 {
 114         GtkWidget *child;
 115         child = gtk_bin_get_child (GTK_BIN(widget));
 116         if (child) {
 117                 cairo_save(cr);
 118                 cairo_scale(cr, 2, 2);
 119                 gtk_widget_draw(child, cr);
 120                 cairo_restore(cr);
 121         }
 122
 123         //GTK_WIDGET_CLASS (gtk_zoom_parent_class)->draw (widget, cr);
 124
 125         return FALSE;
 126 }
 127