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/private.h"
#include "wx/gtk/private/win_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.  The border is
drawn on wxPizza's parent GdkWindow.

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)
        {
            // two windows, both same size
            gdk_window_move_resize(pizza->m_backing_window,
                alloc->x + border_x, alloc->y + border_y, w, h);
            if (is_resize)
                gdk_window_resize(widget->window, w, h);
        }
        else
        {
            // one window
            gdk_window_move_resize(widget->window,
                alloc->x + border_x, alloc->y + border_y, w, h);

            if ((border_x > 0) || (border_y > 0))
            {
                // Otherwise we get can redraw artefacts from
                // the border.
                GtkWidget *parent = gtk_widget_get_parent( widget );
                gtk_widget_queue_draw( parent );
            }
        }
    }
    // 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);
    if (pizza->m_border_style || pizza->m_is_scrollable)
    {
        int border_x, border_y;
        pizza->get_border_widths(border_x, border_y);
        int x = widget->allocation.x + border_x;
        int y = widget->allocation.y + 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)
        {
            // second window is created if wxWindow is scrollable
            GdkWindowAttr attr;
            attr.event_mask = 0;
            attr.x = x;
            attr.y = 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);
            gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
            gdk_window_resize(widget->window, w, h);

            // Parts of m_backing_window may be exposed temporarily while
            // resizing. Setting the backing pixmap to None prevents those
            // areas from being briefly painted black.
            gdk_window_set_back_pixmap(pizza->m_backing_window, NULL, false);
        }
        else
            gdk_window_move_resize(widget->window, x, y, w, h);
    }
}

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;
        }
    }
}

struct AdjustData {
    GdkWindow* window;
    int dx, dy;
};

// Adjust allocations for all widgets using the GdkWindow which was just scrolled
extern "C" {
static void scroll_adjust(GtkWidget* widget, void* data)
{
    const AdjustData* p = static_cast<AdjustData*>(data);
    if (widget->window == p->window)
    {
        widget->allocation.x += p->dx;
        widget->allocation.y += p->dy;
        // GtkFrame requires a queue_resize, otherwise parts of
        // the frame newly exposed by the scroll are not drawn.
        // To be safe, do it for all widgets.
        gtk_widget_queue_resize_no_redraw(widget);
        if (GTK_IS_CONTAINER(widget))
            gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, data);
    }
}
}

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);
        // Adjust child allocations. Doing a queue_resize on the children is not
        // enough, sometimes they redraw in the wrong place during fast scrolling.
        AdjustData data = { widget->window, dx, dy };
        gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, &data);
    }
}

void wxPizza::get_border_widths(int& x, int& y)
{
    x = y = 0;
#ifndef __WXUNIVERSAL__
    if (m_border_style & wxBORDER_SIMPLE)
        x = y = 1;
    else if (m_border_style)
    {
        GtkWidget *entry_widget = wxGTKPrivate::GetEntryWidget();
        if (entry_widget->style)
        {
            x = entry_widget->style->xthickness;
            y = entry_widget->style->ythickness;
        }
    }
#endif
}
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/private.h"
	12	#include "wx/gtk/private/win_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. The border is
	26	drawn on wxPizza's parent GdkWindow.
	27
	28	For RTL, child widget positions are mirrored in size_allocate.
	29	*/
	30
	31	static GtkWidgetClass* parent_class;
	32
	33	extern "C" {
	34
	35	struct wxPizzaClass
	36	{
	37	GtkFixedClass parent;
	38	void (set_scroll_adjustments)(GtkWidget, GtkAdjustment, GtkAdjustment);
	39	};
	40
	41	static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
	42	{
	43	const bool is_resize =
	44	widget->allocation.width != alloc->width \|\|
	45	widget->allocation.height != alloc->height;
	46	const bool is_move =
	47	widget->allocation.x != alloc->x \|\|
	48	widget->allocation.y != alloc->y;
	49
	50	widget->allocation = *alloc;
	51
	52	wxPizza* pizza = WX_PIZZA(widget);
	53	int border_x, border_y;
	54	pizza->get_border_widths(border_x, border_y);
	55	int w = alloc->width - 2 * border_x;
	56	if (w < 0) w = 0;
	57
	58	if (GTK_WIDGET_REALIZED(widget) && (is_move \|\| is_resize))
	59	{
	60	int h = alloc->height - 2 * border_y;
	61	if (h < 0) h = 0;
	62
	63	if (pizza->m_is_scrollable)
	64	{
	65	// two windows, both same size
	66	gdk_window_move_resize(pizza->m_backing_window,
	67	alloc->x + border_x, alloc->y + border_y, w, h);
	68	if (is_resize)
	69	gdk_window_resize(widget->window, w, h);
	70	}
	71	else
	72	{
	73	// one window
	74	gdk_window_move_resize(widget->window,
	75	alloc->x + border_x, alloc->y + border_y, w, h);
	76
	77	if ((border_x > 0) \|\| (border_y > 0))
	78	{
	79	// Otherwise we get can redraw artefacts from
	80	// the border.
	81	GtkWidget *parent = gtk_widget_get_parent( widget );
	82	gtk_widget_queue_draw( parent );
	83	}
	84	}
	85	}
	86	// adjust child positions
	87	for (const GList* list = pizza->m_fixed.children; list; list = list->next)
	88	{
	89	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	90	if (GTK_WIDGET_VISIBLE(child->widget))
	91	{
	92	GtkAllocation child_alloc;
	93	// note that child positions do not take border into
	94	// account, they need to be relative to widget->window,
	95	// which has already been adjusted
	96	child_alloc.x = child->x - pizza->m_scroll_x;
	97	child_alloc.y = child->y - pizza->m_scroll_y;
	98	GtkRequisition req;
	99	gtk_widget_get_child_requisition(child->widget, &req);
	100	child_alloc.width = req.width;
	101	child_alloc.height = req.height;
	102	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	103	{
	104	child_alloc.x = w - child_alloc.x - child_alloc.width;
	105	}
	106	gtk_widget_size_allocate(child->widget, &child_alloc);
	107	}
	108	}
	109	}
	110
	111	static void realize(GtkWidget* widget)
	112	{
	113	parent_class->realize(widget);
	114
	115	wxPizza* pizza = WX_PIZZA(widget);
	116	if (pizza->m_border_style \|\| pizza->m_is_scrollable)
	117	{
	118	int border_x, border_y;
	119	pizza->get_border_widths(border_x, border_y);
	120	int x = widget->allocation.x + border_x;
	121	int y = widget->allocation.y + border_y;
	122	int w = widget->allocation.width - 2 * border_x;
	123	int h = widget->allocation.height - 2 * border_y;
	124	if (w < 0) w = 0;
	125	if (h < 0) h = 0;
	126	if (pizza->m_is_scrollable)
	127	{
	128	// second window is created if wxWindow is scrollable
	129	GdkWindowAttr attr;
	130	attr.event_mask = 0;
	131	attr.x = x;
	132	attr.y = y;
	133	attr.width = w;
	134	attr.height = h;
	135	attr.wclass = GDK_INPUT_OUTPUT;
	136	attr.visual = gtk_widget_get_visual(widget);
	137	attr.colormap = gtk_widget_get_colormap(widget);
	138	attr.window_type = GDK_WINDOW_CHILD;
	139
	140	pizza->m_backing_window = gdk_window_new(
	141	gdk_window_get_parent(widget->window),
	142	&attr,
	143	GDK_WA_X \| GDK_WA_Y \| GDK_WA_VISUAL \| GDK_WA_COLORMAP);
	144
	145	gdk_window_set_user_data(pizza->m_backing_window, widget);
	146	gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
	147	gdk_window_resize(widget->window, w, h);
	148
	149	// Parts of m_backing_window may be exposed temporarily while
	150	// resizing. Setting the backing pixmap to None prevents those
	151	// areas from being briefly painted black.
	152	gdk_window_set_back_pixmap(pizza->m_backing_window, NULL, false);
	153	}
	154	else
	155	gdk_window_move_resize(widget->window, x, y, w, h);
	156	}
	157	}
	158
	159	static void unrealize(GtkWidget* widget)
	160	{
	161	parent_class->unrealize(widget);
	162
	163	wxPizza* pizza = WX_PIZZA(widget);
	164	if (pizza->m_backing_window)
	165	{
	166	gdk_window_set_user_data(pizza->m_backing_window, NULL);
	167	gdk_window_destroy(pizza->m_backing_window);
	168	pizza->m_backing_window = NULL;
	169	}
	170	}
	171
	172	static void map(GtkWidget* widget)
	173	{
	174	parent_class->map(widget);
	175
	176	wxPizza* pizza = WX_PIZZA(widget);
	177	if (pizza->m_backing_window)
	178	gdk_window_show(pizza->m_backing_window);
	179	}
	180
	181	static void unmap(GtkWidget* widget)
	182	{
	183	parent_class->unmap(widget);
	184
	185	wxPizza* pizza = WX_PIZZA(widget);
	186	if (pizza->m_backing_window)
	187	gdk_window_hide(pizza->m_backing_window);
	188	}
	189
	190	// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
	191	static void set_scroll_adjustments(GtkWidget, GtkAdjustment, GtkAdjustment*)
	192	{
	193	}
	194
	195	// Marshaller needed for set_scroll_adjustments signal,
	196	// generated with GLib-2.4.6 glib-genmarshal
	197	#define g_marshal_value_peek_object(v) g_value_get_object (v)
	198	static void
	199	g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure *closure,
	200	GValue * /return_value/,
	201	guint n_param_values,
	202	const GValue *param_values,
	203	gpointer /invocation_hint/,
	204	gpointer marshal_data)
	205	{
	206	typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer data1,
	207	gpointer arg_1,
	208	gpointer arg_2,
	209	gpointer data2);
	210	register GMarshalFunc_VOID__OBJECT_OBJECT callback;
	211	register GCClosure cc = (GCClosure) closure;
	212	register gpointer data1, data2;
	213
	214	g_return_if_fail (n_param_values == 3);
	215
	216	if (G_CCLOSURE_SWAP_DATA (closure))
	217	{
	218	data1 = closure->data;
	219	data2 = g_value_peek_pointer (param_values + 0);
	220	}
	221	else
	222	{
	223	data1 = g_value_peek_pointer (param_values + 0);
	224	data2 = closure->data;
	225	}
	226	callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
	227
	228	callback (data1,
	229	g_marshal_value_peek_object (param_values + 1),
	230	g_marshal_value_peek_object (param_values + 2),
	231	data2);
	232	}
	233
	234	static void class_init(void* g_class, void*)
	235	{
	236	GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
	237	widget_class->size_allocate = size_allocate;
	238	widget_class->realize = realize;
	239	widget_class->unrealize = unrealize;
	240	widget_class->map = map;
	241	widget_class->unmap = unmap;
	242	wxPizzaClass* klass = (wxPizzaClass*)g_class;
	243
	244	// needed to make widget appear scrollable to GTK+
	245	klass->set_scroll_adjustments = set_scroll_adjustments;
	246	widget_class->set_scroll_adjustments_signal =
	247	g_signal_new(
	248	"set_scroll_adjustments",
	249	G_TYPE_FROM_CLASS(g_class),
	250	G_SIGNAL_RUN_LAST,
	251	G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
	252	NULL, NULL,
	253	g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
	254	G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
	255
	256	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
	257	}
	258
	259	} // extern "C"
	260
	261	GType wxPizza::type()
	262	{
	263	static GtkType type;
	264	if (type == 0)
	265	{
	266	const GTypeInfo info = {
	267	sizeof(wxPizzaClass),
	268	NULL, NULL,
	269	class_init,
	270	NULL, NULL,
	271	sizeof(wxPizza), 0,
	272	NULL, NULL
	273	};
	274	type = g_type_register_static(
	275	GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
	276	}
	277	return type;
	278	}
	279
	280	GtkWidget* wxPizza::New(long windowStyle)
	281	{
	282	GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
	283	wxPizza* pizza = WX_PIZZA(widget);
	284	pizza->m_backing_window = NULL;
	285	pizza->m_scroll_x = 0;
	286	pizza->m_scroll_y = 0;
	287	pizza->m_is_scrollable = (windowStyle & (wxHSCROLL \| wxVSCROLL)) != 0;
	288	// mask off border styles not useable with wxPizza
	289	pizza->m_border_style = int(windowStyle & BORDER_STYLES);
	290	gtk_fixed_set_has_window(GTK_FIXED(widget), true);
	291	gtk_widget_add_events(widget,
	292	GDK_EXPOSURE_MASK \|
	293	GDK_SCROLL_MASK \|
	294	GDK_POINTER_MOTION_MASK \|
	295	GDK_POINTER_MOTION_HINT_MASK \|
	296	GDK_BUTTON_MOTION_MASK \|
	297	GDK_BUTTON1_MOTION_MASK \|
	298	GDK_BUTTON2_MOTION_MASK \|
	299	GDK_BUTTON3_MOTION_MASK \|
	300	GDK_BUTTON_PRESS_MASK \|
	301	GDK_BUTTON_RELEASE_MASK \|
	302	GDK_KEY_PRESS_MASK \|
	303	GDK_KEY_RELEASE_MASK \|
	304	GDK_ENTER_NOTIFY_MASK \|
	305	GDK_LEAVE_NOTIFY_MASK \|
	306	GDK_FOCUS_CHANGE_MASK);
	307	return widget;
	308	}
	309
	310	// gtk_fixed_move does not check for a change before issuing a queue_resize,
	311	// we need to avoid that to prevent endless sizing loops, so check first
	312	void wxPizza::move(GtkWidget* widget, int x, int y)
	313	{
	314	GtkFixed* fixed = &m_fixed;
	315	for (const GList* list = fixed->children; list; list = list->next)
	316	{
	317	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	318	if (child->widget == widget)
	319	{
	320	if (child->x != x \|\| child->y != y)
	321	gtk_fixed_move(fixed, widget, x, y);
	322	break;
	323	}
	324	}
	325	}
	326
	327	struct AdjustData {
	328	GdkWindow* window;
	329	int dx, dy;
	330	};
	331
	332	// Adjust allocations for all widgets using the GdkWindow which was just scrolled
	333	extern "C" {
	334	static void scroll_adjust(GtkWidget* widget, void* data)
	335	{
	336	const AdjustData* p = static_cast<AdjustData*>(data);
	337	if (widget->window == p->window)
	338	{
	339	widget->allocation.x += p->dx;
	340	widget->allocation.y += p->dy;
	341	// GtkFrame requires a queue_resize, otherwise parts of
	342	// the frame newly exposed by the scroll are not drawn.
	343	// To be safe, do it for all widgets.
	344	gtk_widget_queue_resize_no_redraw(widget);
	345	if (GTK_IS_CONTAINER(widget))
	346	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, data);
	347	}
	348	}
	349	}
	350
	351	void wxPizza::scroll(int dx, int dy)
	352	{
	353	GtkWidget* widget = GTK_WIDGET(this);
	354	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	355	dx = -dx;
	356	m_scroll_x -= dx;
	357	m_scroll_y -= dy;
	358	if (widget->window)
	359	{
	360	gdk_window_scroll(widget->window, dx, dy);
	361	// Adjust child allocations. Doing a queue_resize on the children is not
	362	// enough, sometimes they redraw in the wrong place during fast scrolling.
	363	AdjustData data = { widget->window, dx, dy };
	364	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, &data);
	365	}
	366	}
	367
	368	void wxPizza::get_border_widths(int& x, int& y)
	369	{
	370	x = y = 0;
	371	#ifndef __WXUNIVERSAL__
	372	if (m_border_style & wxBORDER_SIMPLE)
	373	x = y = 1;
	374	else if (m_border_style)
	375	{
	376	GtkWidget *entry_widget = wxGTKPrivate::GetEntryWidget();
	377	if (entry_widget->style)
	378	{
	379	x = entry_widget->style->xthickness;
	380	y = entry_widget->style->ythickness;
	381	}
	382	}
	383	#endif
	384	}