src/gtk/win_gtk.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk/win_gtk.cpp
// Purpose:     native GTK+ widget for wxWindow
// Author:      Paul Cornett
// Id:          $Id$
// Copyright:   (c) 2007 Paul Cornett
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

#include "wx/defs.h"
#include "wx/gtk/win_gtk.h"
#include "gtk/gtk.h"

/*
wxPizza is a custom GTK+ widget derived from GtkFixed.  A custom widget
is needed to adapt GTK+ to wxWidgets needs in 3 areas: scrolling, window
borders, and RTL.

For scrolling, the "set_scroll_adjustments" signal is implemented
to make wxPizza appear scrollable to GTK+, allowing it to be put in a
GtkScrolledWindow.  Child widget positions are adjusted for the scrolling
position in size_allocate.  A second same-size GdkWindow is placed behind
widget->window, to allow GDK to use a more efficient scrolling technique.

For borders, space is reserved in realize and size_allocate.
For non-scrolling wxWindows, a second GdkWindow is used for the
border; scrolling wxWindows draw their border on wxPizza's parent
(a GtkScrolledWindow) GdkWindow.  Border widths for sunken and raised
styles are taken from widget->style, so they will match the current theme.

For RTL, child widget positions are mirrored in size_allocate.
*/

static GtkWidgetClass* parent_class;

extern "C" {

struct wxPizzaClass
{
    GtkFixedClass parent;
    void (*set_scroll_adjustments)(GtkWidget*, GtkAdjustment*, GtkAdjustment*);
};

static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
{
    const bool is_resize =
        widget->allocation.width  != alloc->width ||
        widget->allocation.height != alloc->height;
    const bool is_move =
        widget->allocation.x != alloc->x ||
        widget->allocation.y != alloc->y;

    widget->allocation = *alloc;

    wxPizza* pizza = WX_PIZZA(widget);
    int border_x, border_y;
    pizza->get_border_widths(border_x, border_y);
    int w = alloc->width - 2 * border_x;
    if (w < 0) w = 0;

    if (GTK_WIDGET_REALIZED(widget) && (is_move || is_resize))
    {
        int h = alloc->height - 2 * border_y;
        if (h < 0) h = 0;

        if (pizza->m_is_scrollable)
        {
            // backing window is inside border
            gdk_window_move_resize(pizza->m_backing_window,
                alloc->x + border_x, alloc->y + border_y, w, h);
        }
        else
        {
            // border window (or only window if
            // no-scroll no-border) is full size
            GdkWindow* window = pizza->m_backing_window;
            if (window == NULL)
                window = widget->window;
            gdk_window_move_resize(
                window, alloc->x, alloc->y, alloc->width, alloc->height);
        }
        if (is_resize && pizza->m_backing_window)
        {
            // main window is inside border
            if (pizza->m_is_scrollable)
                gdk_window_resize(widget->window, w, h);
            else
                // need move as well as resize because border can change
                gdk_window_move_resize(widget->window, border_x, border_y, w, h);

            // wxWidgets turns off redraw-on-allocate by default,
            // so border area needs to be invalidated
            if (border_x > 1 || border_y > 1)
            {
                if (pizza->m_is_scrollable)
                    ; // invalidate does not seem to be needed in this case
                else
                    gdk_window_invalidate_rect(pizza->m_backing_window, NULL, false);
            }
        }
    }
    // adjust child positions
    for (const GList* list = pizza->m_fixed.children; list; list = list->next)
    {
        const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
        if (GTK_WIDGET_VISIBLE(child->widget))
        {
            GtkAllocation child_alloc;
            // note that child positions do not take border into
            // account, they need to be relative to widget->window,
            // which has already been adjusted
            child_alloc.x = child->x - pizza->m_scroll_x;
            child_alloc.y = child->y - pizza->m_scroll_y;
            GtkRequisition req;
            gtk_widget_get_child_requisition(child->widget, &req);
            child_alloc.width  = req.width;
            child_alloc.height = req.height;
            if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
            {
                child_alloc.x = w - child_alloc.x - child_alloc.width;
            }
            gtk_widget_size_allocate(child->widget, &child_alloc);
        }
    }
}

static void realize(GtkWidget* widget)
{
    parent_class->realize(widget);

    wxPizza* pizza = WX_PIZZA(widget);
    // second window is created if there is a border, or wxWindow is scrollable
    if (pizza->m_border_style || pizza->m_is_scrollable)
    {
        GdkWindowAttr attr;
        attr.event_mask = pizza->m_is_scrollable ? 0 : GDK_EXPOSURE_MASK;
        attr.x = widget->allocation.x;
        attr.y = widget->allocation.y;
        attr.width = widget->allocation.width;
        attr.height = widget->allocation.height;
        int border_x, border_y;
        pizza->get_border_widths(border_x, border_y);
        int w = widget->allocation.width  - 2 * border_x;
        int h = widget->allocation.height - 2 * border_y;
        if (w < 0) w = 0;
        if (h < 0) h = 0;
        if (pizza->m_is_scrollable)
        {
            attr.x += border_x;
            attr.y += border_y;
            attr.width  = w;
            attr.height = h;
        }
        attr.wclass = GDK_INPUT_OUTPUT;
        attr.visual = gtk_widget_get_visual(widget);
        attr.colormap = gtk_widget_get_colormap(widget);
        attr.window_type = GDK_WINDOW_CHILD;

        pizza->m_backing_window = gdk_window_new(
            gdk_window_get_parent(widget->window),
            &attr,
            GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP);

        gdk_window_set_user_data(pizza->m_backing_window, widget);
        if (pizza->m_is_scrollable)
            gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
        else
            gdk_window_reparent(widget->window, pizza->m_backing_window, border_x, border_y);
        gdk_window_resize(widget->window, w, h);

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

static void unrealize(GtkWidget* widget)
{
    parent_class->unrealize(widget);

    wxPizza* pizza = WX_PIZZA(widget);
    if (pizza->m_backing_window)
    {
        gdk_window_set_user_data(pizza->m_backing_window, NULL);
        gdk_window_destroy(pizza->m_backing_window);
        pizza->m_backing_window = NULL;
    }
}

static void map(GtkWidget* widget)
{
    parent_class->map(widget);

    wxPizza* pizza = WX_PIZZA(widget);
    if (pizza->m_backing_window)
        gdk_window_show(pizza->m_backing_window);
}

static void unmap(GtkWidget* widget)
{
    parent_class->unmap(widget);

    wxPizza* pizza = WX_PIZZA(widget);
    if (pizza->m_backing_window)
        gdk_window_hide(pizza->m_backing_window);
}

// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
static void set_scroll_adjustments(GtkWidget*, GtkAdjustment*, GtkAdjustment*)
{
}

// Marshaller needed for set_scroll_adjustments signal,
// generated with GLib-2.4.6 glib-genmarshal
#define g_marshal_value_peek_object(v)   g_value_get_object (v)
static void
g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure     *closure,
                                             GValue       * /*return_value*/,
                                             guint         n_param_values,
                                             const GValue *param_values,
                                             gpointer      /*invocation_hint*/,
                                             gpointer      marshal_data)
{
  typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer     data1,
                                                    gpointer     arg_1,
                                                    gpointer     arg_2,
                                                    gpointer     data2);
  register GMarshalFunc_VOID__OBJECT_OBJECT callback;
  register GCClosure *cc = (GCClosure*) closure;
  register gpointer data1, data2;

  g_return_if_fail (n_param_values == 3);

  if (G_CCLOSURE_SWAP_DATA (closure))
    {
      data1 = closure->data;
      data2 = g_value_peek_pointer (param_values + 0);
    }
  else
    {
      data1 = g_value_peek_pointer (param_values + 0);
      data2 = closure->data;
    }
  callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);

  callback (data1,
            g_marshal_value_peek_object (param_values + 1),
            g_marshal_value_peek_object (param_values + 2),
            data2);
}

static void class_init(void* g_class, void*)
{
    GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
    widget_class->size_allocate = size_allocate;
    widget_class->realize = realize;
    widget_class->unrealize = unrealize;
    widget_class->map = map;
    widget_class->unmap = unmap;
    wxPizzaClass* klass = (wxPizzaClass*)g_class;

    // needed to make widget appear scrollable to GTK+
    klass->set_scroll_adjustments = set_scroll_adjustments;
    widget_class->set_scroll_adjustments_signal =
        g_signal_new(
            "set_scroll_adjustments",
            G_TYPE_FROM_CLASS(g_class),
            G_SIGNAL_RUN_LAST,
            G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
            NULL, NULL,
            g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
            G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);

    parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
}

} // extern "C"

GType wxPizza::type()
{
    static GtkType type;
    if (type == 0)
    {
        const GTypeInfo info = {
            sizeof(wxPizzaClass),
            NULL, NULL,
            class_init,
            NULL, NULL,
            sizeof(wxPizza), 0,
            NULL, NULL
        };
        type = g_type_register_static(
            GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
    }
    return type;
}

GtkWidget* wxPizza::New(long windowStyle)
{
    GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
    wxPizza* pizza = WX_PIZZA(widget);
    pizza->m_backing_window = NULL;
    pizza->m_scroll_x = 0;
    pizza->m_scroll_y = 0;
    pizza->m_is_scrollable = (windowStyle & (wxHSCROLL | wxVSCROLL)) != 0;
    // mask off border styles not useable with wxPizza
    pizza->m_border_style = int(windowStyle & BORDER_STYLES);
    gtk_fixed_set_has_window(GTK_FIXED(widget), true);
    gtk_widget_add_events(widget,
        GDK_EXPOSURE_MASK |
        GDK_SCROLL_MASK |
        GDK_POINTER_MOTION_MASK |
        GDK_POINTER_MOTION_HINT_MASK |
        GDK_BUTTON_MOTION_MASK |
        GDK_BUTTON1_MOTION_MASK |
        GDK_BUTTON2_MOTION_MASK |
        GDK_BUTTON3_MOTION_MASK |
        GDK_BUTTON_PRESS_MASK |
        GDK_BUTTON_RELEASE_MASK |
        GDK_KEY_PRESS_MASK |
        GDK_KEY_RELEASE_MASK |
        GDK_ENTER_NOTIFY_MASK |
        GDK_LEAVE_NOTIFY_MASK |
        GDK_FOCUS_CHANGE_MASK);
    return widget;
}

// gtk_fixed_move does not check for a change before issuing a queue_resize,
// we need to avoid that to prevent endless sizing loops, so check first
void wxPizza::move(GtkWidget* widget, int x, int y)
{
    GtkFixed* fixed = &m_fixed;
    for (const GList* list = fixed->children; list; list = list->next)
    {
        const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
        if (child->widget == widget)
        {
            if (child->x != x || child->y != y)
                gtk_fixed_move(fixed, widget, x, y);
            break;
        }
    }
}

void wxPizza::scroll(int dx, int dy)
{
    GtkWidget* widget = GTK_WIDGET(this);
    if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
        dx = -dx;
    m_scroll_x -= dx;
    m_scroll_y -= dy;
    if (widget->window)
        gdk_window_scroll(widget->window, dx, dy);
    const GList* list = m_fixed.children;
    if (list)
    {
        const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
        // queueing a resize on any child will update them all
        gtk_widget_queue_resize(child->widget);
    }
}

extern GtkWidget *GetEntryWidget();

void wxPizza::get_border_widths(int& x, int& y)
{
    x = y = 0;
    if (m_border_style & wxBORDER_SIMPLE)
        x = y = 1;
    else if (m_border_style)
    {
        GtkWidget *entry_widget = GetEntryWidget();
        if (entry_widget->style)
        {
            x = entry_widget->style->xthickness;
            y = entry_widget->style->ythickness;
        }
    }
}
Commit	Line	Data
	1	///////////////////////////////////////////////////////////////////////////////
	2	// Name: src/gtk/win_gtk.cpp
	3	// Purpose: native GTK+ widget for wxWindow
	4	// Author: Paul Cornett
	5	// Id: $Id$
	6	// Copyright: (c) 2007 Paul Cornett
	7	// Licence: wxWindows licence
	8	///////////////////////////////////////////////////////////////////////////////
	9
	10	#include "wx/defs.h"
	11	#include "wx/gtk/win_gtk.h"
	12	#include "gtk/gtk.h"
	13
	14	/*
	15	wxPizza is a custom GTK+ widget derived from GtkFixed. A custom widget
	16	is needed to adapt GTK+ to wxWidgets needs in 3 areas: scrolling, window
	17	borders, and RTL.
	18
	19	For scrolling, the "set_scroll_adjustments" signal is implemented
	20	to make wxPizza appear scrollable to GTK+, allowing it to be put in a
	21	GtkScrolledWindow. Child widget positions are adjusted for the scrolling
	22	position in size_allocate. A second same-size GdkWindow is placed behind
	23	widget->window, to allow GDK to use a more efficient scrolling technique.
	24
	25	For borders, space is reserved in realize and size_allocate.
	26	For non-scrolling wxWindows, a second GdkWindow is used for the
	27	border; scrolling wxWindows draw their border on wxPizza's parent
	28	(a GtkScrolledWindow) GdkWindow. Border widths for sunken and raised
	29	styles are taken from widget->style, so they will match the current theme.
	30
	31	For RTL, child widget positions are mirrored in size_allocate.
	32	*/
	33
	34	static GtkWidgetClass* parent_class;
	35
	36	extern "C" {
	37
	38	struct wxPizzaClass
	39	{
	40	GtkFixedClass parent;
	41	void (set_scroll_adjustments)(GtkWidget, GtkAdjustment, GtkAdjustment);
	42	};
	43
	44	static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
	45	{
	46	const bool is_resize =
	47	widget->allocation.width != alloc->width \|\|
	48	widget->allocation.height != alloc->height;
	49	const bool is_move =
	50	widget->allocation.x != alloc->x \|\|
	51	widget->allocation.y != alloc->y;
	52
	53	widget->allocation = *alloc;
	54
	55	wxPizza* pizza = WX_PIZZA(widget);
	56	int border_x, border_y;
	57	pizza->get_border_widths(border_x, border_y);
	58	int w = alloc->width - 2 * border_x;
	59	if (w < 0) w = 0;
	60
	61	if (GTK_WIDGET_REALIZED(widget) && (is_move \|\| is_resize))
	62	{
	63	int h = alloc->height - 2 * border_y;
	64	if (h < 0) h = 0;
	65
	66	if (pizza->m_is_scrollable)
	67	{
	68	// backing window is inside border
	69	gdk_window_move_resize(pizza->m_backing_window,
	70	alloc->x + border_x, alloc->y + border_y, w, h);
	71	}
	72	else
	73	{
	74	// border window (or only window if
	75	// no-scroll no-border) is full size
	76	GdkWindow* window = pizza->m_backing_window;
	77	if (window == NULL)
	78	window = widget->window;
	79	gdk_window_move_resize(
	80	window, alloc->x, alloc->y, alloc->width, alloc->height);
	81	}
	82	if (is_resize && pizza->m_backing_window)
	83	{
	84	// main window is inside border
	85	if (pizza->m_is_scrollable)
	86	gdk_window_resize(widget->window, w, h);
	87	else
	88	// need move as well as resize because border can change
	89	gdk_window_move_resize(widget->window, border_x, border_y, w, h);
	90
	91	// wxWidgets turns off redraw-on-allocate by default,
	92	// so border area needs to be invalidated
	93	if (border_x > 1 \|\| border_y > 1)
	94	{
	95	if (pizza->m_is_scrollable)
	96	; // invalidate does not seem to be needed in this case
	97	else
	98	gdk_window_invalidate_rect(pizza->m_backing_window, NULL, false);
	99	}
	100	}
	101	}
	102	// adjust child positions
	103	for (const GList* list = pizza->m_fixed.children; list; list = list->next)
	104	{
	105	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	106	if (GTK_WIDGET_VISIBLE(child->widget))
	107	{
	108	GtkAllocation child_alloc;
	109	// note that child positions do not take border into
	110	// account, they need to be relative to widget->window,
	111	// which has already been adjusted
	112	child_alloc.x = child->x - pizza->m_scroll_x;
	113	child_alloc.y = child->y - pizza->m_scroll_y;
	114	GtkRequisition req;
	115	gtk_widget_get_child_requisition(child->widget, &req);
	116	child_alloc.width = req.width;
	117	child_alloc.height = req.height;
	118	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	119	{
	120	child_alloc.x = w - child_alloc.x - child_alloc.width;
	121	}
	122	gtk_widget_size_allocate(child->widget, &child_alloc);
	123	}
	124	}
	125	}
	126
	127	static void realize(GtkWidget* widget)
	128	{
	129	parent_class->realize(widget);
	130
	131	wxPizza* pizza = WX_PIZZA(widget);
	132	// second window is created if there is a border, or wxWindow is scrollable
	133	if (pizza->m_border_style \|\| pizza->m_is_scrollable)
	134	{
	135	GdkWindowAttr attr;
	136	attr.event_mask = pizza->m_is_scrollable ? 0 : GDK_EXPOSURE_MASK;
	137	attr.x = widget->allocation.x;
	138	attr.y = widget->allocation.y;
	139	attr.width = widget->allocation.width;
	140	attr.height = widget->allocation.height;
	141	int border_x, border_y;
	142	pizza->get_border_widths(border_x, border_y);
	143	int w = widget->allocation.width - 2 * border_x;
	144	int h = widget->allocation.height - 2 * border_y;
	145	if (w < 0) w = 0;
	146	if (h < 0) h = 0;
	147	if (pizza->m_is_scrollable)
	148	{
	149	attr.x += border_x;
	150	attr.y += border_y;
	151	attr.width = w;
	152	attr.height = h;
	153	}
	154	attr.wclass = GDK_INPUT_OUTPUT;
	155	attr.visual = gtk_widget_get_visual(widget);
	156	attr.colormap = gtk_widget_get_colormap(widget);
	157	attr.window_type = GDK_WINDOW_CHILD;
	158
	159	pizza->m_backing_window = gdk_window_new(
	160	gdk_window_get_parent(widget->window),
	161	&attr,
	162	GDK_WA_X \| GDK_WA_Y \| GDK_WA_VISUAL \| GDK_WA_COLORMAP);
	163
	164	gdk_window_set_user_data(pizza->m_backing_window, widget);
	165	if (pizza->m_is_scrollable)
	166	gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
	167	else
	168	gdk_window_reparent(widget->window, pizza->m_backing_window, border_x, border_y);
	169	gdk_window_resize(widget->window, w, h);
	170
	171	widget->style = gtk_style_attach (widget->style, pizza->m_backing_window);
	172	gtk_style_set_background (widget->style, pizza->m_backing_window, GTK_STATE_NORMAL);
	173	}
	174	}
	175
	176	static void unrealize(GtkWidget* widget)
	177	{
	178	parent_class->unrealize(widget);
	179
	180	wxPizza* pizza = WX_PIZZA(widget);
	181	if (pizza->m_backing_window)
	182	{
	183	gdk_window_set_user_data(pizza->m_backing_window, NULL);
	184	gdk_window_destroy(pizza->m_backing_window);
	185	pizza->m_backing_window = NULL;
	186	}
	187	}
	188
	189	static void map(GtkWidget* widget)
	190	{
	191	parent_class->map(widget);
	192
	193	wxPizza* pizza = WX_PIZZA(widget);
	194	if (pizza->m_backing_window)
	195	gdk_window_show(pizza->m_backing_window);
	196	}
	197
	198	static void unmap(GtkWidget* widget)
	199	{
	200	parent_class->unmap(widget);
	201
	202	wxPizza* pizza = WX_PIZZA(widget);
	203	if (pizza->m_backing_window)
	204	gdk_window_hide(pizza->m_backing_window);
	205	}
	206
	207	// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
	208	static void set_scroll_adjustments(GtkWidget, GtkAdjustment, GtkAdjustment*)
	209	{
	210	}
	211
	212	// Marshaller needed for set_scroll_adjustments signal,
	213	// generated with GLib-2.4.6 glib-genmarshal
	214	#define g_marshal_value_peek_object(v) g_value_get_object (v)
	215	static void
	216	g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure *closure,
	217	GValue * /return_value/,
	218	guint n_param_values,
	219	const GValue *param_values,
	220	gpointer /invocation_hint/,
	221	gpointer marshal_data)
	222	{
	223	typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer data1,
	224	gpointer arg_1,
	225	gpointer arg_2,
	226	gpointer data2);
	227	register GMarshalFunc_VOID__OBJECT_OBJECT callback;
	228	register GCClosure cc = (GCClosure) closure;
	229	register gpointer data1, data2;
	230
	231	g_return_if_fail (n_param_values == 3);
	232
	233	if (G_CCLOSURE_SWAP_DATA (closure))
	234	{
	235	data1 = closure->data;
	236	data2 = g_value_peek_pointer (param_values + 0);
	237	}
	238	else
	239	{
	240	data1 = g_value_peek_pointer (param_values + 0);
	241	data2 = closure->data;
	242	}
	243	callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
	244
	245	callback (data1,
	246	g_marshal_value_peek_object (param_values + 1),
	247	g_marshal_value_peek_object (param_values + 2),
	248	data2);
	249	}
	250
	251	static void class_init(void* g_class, void*)
	252	{
	253	GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
	254	widget_class->size_allocate = size_allocate;
	255	widget_class->realize = realize;
	256	widget_class->unrealize = unrealize;
	257	widget_class->map = map;
	258	widget_class->unmap = unmap;
	259	wxPizzaClass* klass = (wxPizzaClass*)g_class;
	260
	261	// needed to make widget appear scrollable to GTK+
	262	klass->set_scroll_adjustments = set_scroll_adjustments;
	263	widget_class->set_scroll_adjustments_signal =
	264	g_signal_new(
	265	"set_scroll_adjustments",
	266	G_TYPE_FROM_CLASS(g_class),
	267	G_SIGNAL_RUN_LAST,
	268	G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
	269	NULL, NULL,
	270	g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
	271	G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
	272
	273	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
	274	}
	275
	276	} // extern "C"
	277
	278	GType wxPizza::type()
	279	{
	280	static GtkType type;
	281	if (type == 0)
	282	{
	283	const GTypeInfo info = {
	284	sizeof(wxPizzaClass),
	285	NULL, NULL,
	286	class_init,
	287	NULL, NULL,
	288	sizeof(wxPizza), 0,
	289	NULL, NULL
	290	};
	291	type = g_type_register_static(
	292	GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
	293	}
	294	return type;
	295	}
	296
	297	GtkWidget* wxPizza::New(long windowStyle)
	298	{
	299	GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
	300	wxPizza* pizza = WX_PIZZA(widget);
	301	pizza->m_backing_window = NULL;
	302	pizza->m_scroll_x = 0;
	303	pizza->m_scroll_y = 0;
	304	pizza->m_is_scrollable = (windowStyle & (wxHSCROLL \| wxVSCROLL)) != 0;
	305	// mask off border styles not useable with wxPizza
	306	pizza->m_border_style = int(windowStyle & BORDER_STYLES);
	307	gtk_fixed_set_has_window(GTK_FIXED(widget), true);
	308	gtk_widget_add_events(widget,
	309	GDK_EXPOSURE_MASK \|
	310	GDK_SCROLL_MASK \|
	311	GDK_POINTER_MOTION_MASK \|
	312	GDK_POINTER_MOTION_HINT_MASK \|
	313	GDK_BUTTON_MOTION_MASK \|
	314	GDK_BUTTON1_MOTION_MASK \|
	315	GDK_BUTTON2_MOTION_MASK \|
	316	GDK_BUTTON3_MOTION_MASK \|
	317	GDK_BUTTON_PRESS_MASK \|
	318	GDK_BUTTON_RELEASE_MASK \|
	319	GDK_KEY_PRESS_MASK \|
	320	GDK_KEY_RELEASE_MASK \|
	321	GDK_ENTER_NOTIFY_MASK \|
	322	GDK_LEAVE_NOTIFY_MASK \|
	323	GDK_FOCUS_CHANGE_MASK);
	324	return widget;
	325	}
	326
	327	// gtk_fixed_move does not check for a change before issuing a queue_resize,
	328	// we need to avoid that to prevent endless sizing loops, so check first
	329	void wxPizza::move(GtkWidget* widget, int x, int y)
	330	{
	331	GtkFixed* fixed = &m_fixed;
	332	for (const GList* list = fixed->children; list; list = list->next)
	333	{
	334	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	335	if (child->widget == widget)
	336	{
	337	if (child->x != x \|\| child->y != y)
	338	gtk_fixed_move(fixed, widget, x, y);
	339	break;
	340	}
	341	}
	342	}
	343
	344	void wxPizza::scroll(int dx, int dy)
	345	{
	346	GtkWidget* widget = GTK_WIDGET(this);
	347	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	348	dx = -dx;
	349	m_scroll_x -= dx;
	350	m_scroll_y -= dy;
	351	if (widget->window)
	352	gdk_window_scroll(widget->window, dx, dy);
	353	const GList* list = m_fixed.children;
	354	if (list)
	355	{
	356	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	357	// queueing a resize on any child will update them all
	358	gtk_widget_queue_resize(child->widget);
	359	}
	360	}
	361
	362	extern GtkWidget *GetEntryWidget();
	363
	364	void wxPizza::get_border_widths(int& x, int& y)
	365	{
	366	x = y = 0;
	367	if (m_border_style & wxBORDER_SIMPLE)
	368	x = y = 1;
	369	else if (m_border_style)
	370	{
	371	GtkWidget *entry_widget = GetEntryWidget();
	372	if (entry_widget->style)
	373	{
	374	x = entry_widget->style->xthickness;
	375	y = entry_widget->style->ythickness;
	376	}
	377	}
	378	}