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.

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;

    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;

        gdk_window_move_resize(widget->window,
            alloc->x + border_x, alloc->y + border_y, w, h);

        if (is_resize && (border_x || border_y))
        {
            // old and new border areas need to be invalidated,
            // otherwise they will not be erased/redrawn properly
            GdkWindow* parent = gtk_widget_get_parent_window(widget);
            gdk_window_invalidate_rect(parent, &widget->allocation, false);
            gdk_window_invalidate_rect(parent, alloc, false);
        }
    }

    widget->allocation = *alloc;

    // 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)
    {
        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;
        gdk_window_move_resize(widget->window, x, y, w, h);
    }
}

static void show(GtkWidget* widget)
{
    if (widget->parent && WX_PIZZA(widget)->m_border_style)
    {
        // invalidate whole allocation so borders will be drawn properly
        const GtkAllocation& a = widget->allocation;
        gtk_widget_queue_draw_area(widget->parent, a.x, a.y, a.width, a.height);
    }

    parent_class->show(widget);
}

static void hide(GtkWidget* widget)
{
    if (widget->parent && WX_PIZZA(widget)->m_border_style)
    {
        // invalidate whole allocation so borders will be erased properly
        const GtkAllocation& a = widget->allocation;
        gtk_widget_queue_draw_area(widget->parent, a.x, a.y, a.width, a.height);
    }

    parent_class->hide(widget);
}

// 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->show = show;
    widget_class->hide = hide;
    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_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::put(GtkWidget* widget, int x, int y)
{
    gtk_fixed_put(&m_fixed, widget, x, y);
}

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);
    widget->allocation.x += p->dx;
    widget->allocation.y += p->dy;

    if (widget->window == p->window)
    {
        // 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;
    if (m_border_style == 0)
        return;

#ifndef __WXUNIVERSAL__
    if (m_border_style & wxBORDER_SIMPLE)
        x = y = 1;
    else if (m_is_scrollable /* || (m_border_style & wxBORDER_THEME) */)
    {
        GtkWidget *style_widget = wxGTKPrivate::GetTreeWidget();

        if (style_widget->style)
        {
            x = style_widget->style->xthickness;
            y = style_widget->style->ythickness;
        }
    }
    else
    {
        GtkWidget *style_widget = wxGTKPrivate::GetEntryWidget();

        if (style_widget->style)
        {
            x = style_widget->style->xthickness;
            y = style_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.
	23
	24	For borders, space is reserved in realize and size_allocate. The border is
	25	drawn on wxPizza's parent GdkWindow.
	26
	27	For RTL, child widget positions are mirrored in size_allocate.
	28	*/
	29
	30	static GtkWidgetClass* parent_class;
	31
	32	extern "C" {
	33
	34	struct wxPizzaClass
	35	{
	36	GtkFixedClass parent;
	37	void (set_scroll_adjustments)(GtkWidget, GtkAdjustment, GtkAdjustment);
	38	};
	39
	40	static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
	41	{
	42	const bool is_resize =
	43	widget->allocation.width != alloc->width \|\|
	44	widget->allocation.height != alloc->height;
	45	const bool is_move =
	46	widget->allocation.x != alloc->x \|\|
	47	widget->allocation.y != alloc->y;
	48
	49	wxPizza* pizza = WX_PIZZA(widget);
	50	int border_x, border_y;
	51	pizza->get_border_widths(border_x, border_y);
	52	int w = alloc->width - 2 * border_x;
	53	if (w < 0) w = 0;
	54
	55	if (GTK_WIDGET_REALIZED(widget) && (is_move \|\| is_resize))
	56	{
	57	int h = alloc->height - 2 * border_y;
	58	if (h < 0) h = 0;
	59
	60	gdk_window_move_resize(widget->window,
	61	alloc->x + border_x, alloc->y + border_y, w, h);
	62
	63	if (is_resize && (border_x \|\| border_y))
	64	{
	65	// old and new border areas need to be invalidated,
	66	// otherwise they will not be erased/redrawn properly
	67	GdkWindow* parent = gtk_widget_get_parent_window(widget);
	68	gdk_window_invalidate_rect(parent, &widget->allocation, false);
	69	gdk_window_invalidate_rect(parent, alloc, false);
	70	}
	71	}
	72
	73	widget->allocation = *alloc;
	74
	75	// adjust child positions
	76	for (const GList* list = pizza->m_fixed.children; list; list = list->next)
	77	{
	78	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	79	if (GTK_WIDGET_VISIBLE(child->widget))
	80	{
	81	GtkAllocation child_alloc;
	82	// note that child positions do not take border into
	83	// account, they need to be relative to widget->window,
	84	// which has already been adjusted
	85	child_alloc.x = child->x - pizza->m_scroll_x;
	86	child_alloc.y = child->y - pizza->m_scroll_y;
	87	GtkRequisition req;
	88	gtk_widget_get_child_requisition(child->widget, &req);
	89	child_alloc.width = req.width;
	90	child_alloc.height = req.height;
	91	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	92	child_alloc.x = w - child_alloc.x - child_alloc.width;
	93	gtk_widget_size_allocate(child->widget, &child_alloc);
	94	}
	95	}
	96	}
	97
	98	static void realize(GtkWidget* widget)
	99	{
	100	parent_class->realize(widget);
	101
	102	wxPizza* pizza = WX_PIZZA(widget);
	103	if (pizza->m_border_style)
	104	{
	105	int border_x, border_y;
	106	pizza->get_border_widths(border_x, border_y);
	107	int x = widget->allocation.x + border_x;
	108	int y = widget->allocation.y + border_y;
	109	int w = widget->allocation.width - 2 * border_x;
	110	int h = widget->allocation.height - 2 * border_y;
	111	if (w < 0) w = 0;
	112	if (h < 0) h = 0;
	113	gdk_window_move_resize(widget->window, x, y, w, h);
	114	}
	115	}
	116
	117	static void show(GtkWidget* widget)
	118	{
	119	if (widget->parent && WX_PIZZA(widget)->m_border_style)
	120	{
	121	// invalidate whole allocation so borders will be drawn properly
	122	const GtkAllocation& a = widget->allocation;
	123	gtk_widget_queue_draw_area(widget->parent, a.x, a.y, a.width, a.height);
	124	}
	125
	126	parent_class->show(widget);
	127	}
	128
	129	static void hide(GtkWidget* widget)
	130	{
	131	if (widget->parent && WX_PIZZA(widget)->m_border_style)
	132	{
	133	// invalidate whole allocation so borders will be erased properly
	134	const GtkAllocation& a = widget->allocation;
	135	gtk_widget_queue_draw_area(widget->parent, a.x, a.y, a.width, a.height);
	136	}
	137
	138	parent_class->hide(widget);
	139	}
	140
	141	// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
	142	static void set_scroll_adjustments(GtkWidget, GtkAdjustment, GtkAdjustment*)
	143	{
	144	}
	145
	146	// Marshaller needed for set_scroll_adjustments signal,
	147	// generated with GLib-2.4.6 glib-genmarshal
	148	#define g_marshal_value_peek_object(v) g_value_get_object (v)
	149	static void
	150	g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure *closure,
	151	GValue * /return_value/,
	152	guint n_param_values,
	153	const GValue *param_values,
	154	gpointer /invocation_hint/,
	155	gpointer marshal_data)
	156	{
	157	typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer data1,
	158	gpointer arg_1,
	159	gpointer arg_2,
	160	gpointer data2);
	161	register GMarshalFunc_VOID__OBJECT_OBJECT callback;
	162	register GCClosure cc = (GCClosure) closure;
	163	register gpointer data1, data2;
	164
	165	g_return_if_fail (n_param_values == 3);
	166
	167	if (G_CCLOSURE_SWAP_DATA (closure))
	168	{
	169	data1 = closure->data;
	170	data2 = g_value_peek_pointer (param_values + 0);
	171	}
	172	else
	173	{
	174	data1 = g_value_peek_pointer (param_values + 0);
	175	data2 = closure->data;
	176	}
	177	callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
	178
	179	callback (data1,
	180	g_marshal_value_peek_object (param_values + 1),
	181	g_marshal_value_peek_object (param_values + 2),
	182	data2);
	183	}
	184
	185	static void class_init(void* g_class, void*)
	186	{
	187	GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
	188	widget_class->size_allocate = size_allocate;
	189	widget_class->realize = realize;
	190	widget_class->show = show;
	191	widget_class->hide = hide;
	192	wxPizzaClass* klass = (wxPizzaClass*)g_class;
	193
	194	// needed to make widget appear scrollable to GTK+
	195	klass->set_scroll_adjustments = set_scroll_adjustments;
	196	widget_class->set_scroll_adjustments_signal =
	197	g_signal_new(
	198	"set_scroll_adjustments",
	199	G_TYPE_FROM_CLASS(g_class),
	200	G_SIGNAL_RUN_LAST,
	201	G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
	202	NULL, NULL,
	203	g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
	204	G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
	205
	206	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
	207	}
	208
	209	} // extern "C"
	210
	211	GType wxPizza::type()
	212	{
	213	static GtkType type;
	214	if (type == 0)
	215	{
	216	const GTypeInfo info = {
	217	sizeof(wxPizzaClass),
	218	NULL, NULL,
	219	class_init,
	220	NULL, NULL,
	221	sizeof(wxPizza), 0,
	222	NULL, NULL
	223	};
	224	type = g_type_register_static(
	225	GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
	226	}
	227	return type;
	228	}
	229
	230	GtkWidget* wxPizza::New(long windowStyle)
	231	{
	232	GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
	233	wxPizza* pizza = WX_PIZZA(widget);
	234	pizza->m_scroll_x = 0;
	235	pizza->m_scroll_y = 0;
	236	pizza->m_is_scrollable = (windowStyle & (wxHSCROLL \| wxVSCROLL)) != 0;
	237	// mask off border styles not useable with wxPizza
	238	pizza->m_border_style = int(windowStyle & BORDER_STYLES);
	239	gtk_fixed_set_has_window(GTK_FIXED(widget), true);
	240	gtk_widget_add_events(widget,
	241	GDK_EXPOSURE_MASK \|
	242	GDK_SCROLL_MASK \|
	243	GDK_POINTER_MOTION_MASK \|
	244	GDK_POINTER_MOTION_HINT_MASK \|
	245	GDK_BUTTON_MOTION_MASK \|
	246	GDK_BUTTON1_MOTION_MASK \|
	247	GDK_BUTTON2_MOTION_MASK \|
	248	GDK_BUTTON3_MOTION_MASK \|
	249	GDK_BUTTON_PRESS_MASK \|
	250	GDK_BUTTON_RELEASE_MASK \|
	251	GDK_KEY_PRESS_MASK \|
	252	GDK_KEY_RELEASE_MASK \|
	253	GDK_ENTER_NOTIFY_MASK \|
	254	GDK_LEAVE_NOTIFY_MASK \|
	255	GDK_FOCUS_CHANGE_MASK);
	256	return widget;
	257	}
	258
	259	// gtk_fixed_move does not check for a change before issuing a queue_resize,
	260	// we need to avoid that to prevent endless sizing loops, so check first
	261	void wxPizza::move(GtkWidget* widget, int x, int y)
	262	{
	263	GtkFixed* fixed = &m_fixed;
	264	for (const GList* list = fixed->children; list; list = list->next)
	265	{
	266	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	267	if (child->widget == widget)
	268	{
	269	if (child->x != x \|\| child->y != y)
	270	gtk_fixed_move(fixed, widget, x, y);
	271	break;
	272	}
	273	}
	274	}
	275
	276	void wxPizza::put(GtkWidget* widget, int x, int y)
	277	{
	278	gtk_fixed_put(&m_fixed, widget, x, y);
	279	}
	280
	281	struct AdjustData {
	282	GdkWindow* window;
	283	int dx, dy;
	284	};
	285
	286	// Adjust allocations for all widgets using the GdkWindow which was just scrolled
	287	extern "C" {
	288	static void scroll_adjust(GtkWidget* widget, void* data)
	289	{
	290	const AdjustData* p = static_cast<AdjustData*>(data);
	291	widget->allocation.x += p->dx;
	292	widget->allocation.y += p->dy;
	293
	294	if (widget->window == p->window)
	295	{
	296	// GtkFrame requires a queue_resize, otherwise parts of
	297	// the frame newly exposed by the scroll are not drawn.
	298	// To be safe, do it for all widgets.
	299	gtk_widget_queue_resize_no_redraw(widget);
	300	if (GTK_IS_CONTAINER(widget))
	301	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, data);
	302	}
	303	}
	304	}
	305
	306	void wxPizza::scroll(int dx, int dy)
	307	{
	308	GtkWidget* widget = GTK_WIDGET(this);
	309	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	310	dx = -dx;
	311	m_scroll_x -= dx;
	312	m_scroll_y -= dy;
	313	if (widget->window)
	314	{
	315	gdk_window_scroll(widget->window, dx, dy);
	316	// Adjust child allocations. Doing a queue_resize on the children is not
	317	// enough, sometimes they redraw in the wrong place during fast scrolling.
	318	AdjustData data = { widget->window, dx, dy };
	319	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, &data);
	320	}
	321	}
	322
	323	void wxPizza::get_border_widths(int& x, int& y)
	324	{
	325	x = y = 0;
	326	if (m_border_style == 0)
	327	return;
	328
	329	#ifndef __WXUNIVERSAL__
	330	if (m_border_style & wxBORDER_SIMPLE)
	331	x = y = 1;
	332	else if (m_is_scrollable /* \|\| (m_border_style & wxBORDER_THEME) */)
	333	{
	334	GtkWidget *style_widget = wxGTKPrivate::GetTreeWidget();
	335
	336	if (style_widget->style)
	337	{
	338	x = style_widget->style->xthickness;
	339	y = style_widget->style->ythickness;
	340	}
	341	}
	342	else
	343	{
	344	GtkWidget *style_widget = wxGTKPrivate::GetEntryWidget();
	345
	346	if (style_widget->style)
	347	{
	348	x = style_widget->style->xthickness;
	349	y = style_widget->style->ythickness;
	350	}
	351	}
	352	#endif
	353	}