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;

    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 (is_resize && (border_x || border_y))
            {
                // old and new border areas need to be invalidated,
                // otherwise they will not be erased/redrawn properly
                const GtkAllocation& a1 = widget->allocation;
                const GtkAllocation& a2 = *alloc;
                GdkRectangle r1 = { a1.x, a1.y, a1.width, a1.height };
                GdkRectangle r2 = { a2.x, a2.y, a2.width, a2.height };
                gdk_window_invalidate_rect(widget->parent->window, &r1, false);
                gdk_window_invalidate_rect(widget->parent->window, &r2, 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_old_alloc = child->widget->allocation;

            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,void* owner)
{
    GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
    wxPizza* pizza = WX_PIZZA(widget);
    pizza->m_owner = owner;
    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);
    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. 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	wxPizza* pizza = WX_PIZZA(widget);
	51	int border_x, border_y;
	52	pizza->get_border_widths(border_x, border_y);
	53	int w = alloc->width - 2 * border_x;
	54	if (w < 0) w = 0;
	55
	56	if (GTK_WIDGET_REALIZED(widget) && (is_move \|\| is_resize))
	57	{
	58	int h = alloc->height - 2 * border_y;
	59	if (h < 0) h = 0;
	60
	61	if (pizza->m_is_scrollable)
	62	{
	63	// two windows, both same size
	64	gdk_window_move_resize(pizza->m_backing_window,
	65	alloc->x + border_x, alloc->y + border_y, w, h);
	66	if (is_resize)
	67	gdk_window_resize(widget->window, w, h);
	68	}
	69	else
	70	{
	71	// one window
	72	gdk_window_move_resize(widget->window,
	73	alloc->x + border_x, alloc->y + border_y, w, h);
	74
	75	if (is_resize && (border_x \|\| border_y))
	76	{
	77	// old and new border areas need to be invalidated,
	78	// otherwise they will not be erased/redrawn properly
	79	const GtkAllocation& a1 = widget->allocation;
	80	const GtkAllocation& a2 = *alloc;
	81	GdkRectangle r1 = { a1.x, a1.y, a1.width, a1.height };
	82	GdkRectangle r2 = { a2.x, a2.y, a2.width, a2.height };
	83	gdk_window_invalidate_rect(widget->parent->window, &r1, false);
	84	gdk_window_invalidate_rect(widget->parent->window, &r2, false);
	85	}
	86	}
	87	}
	88
	89	widget->allocation = *alloc;
	90
	91	// adjust child positions
	92	for (const GList* list = pizza->m_fixed.children; list; list = list->next)
	93	{
	94	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	95	if (GTK_WIDGET_VISIBLE(child->widget))
	96	{
	97	GtkAllocation child_old_alloc = child->widget->allocation;
	98
	99	GtkAllocation child_alloc;
	100	// note that child positions do not take border into
	101	// account, they need to be relative to widget->window,
	102	// which has already been adjusted
	103	child_alloc.x = child->x - pizza->m_scroll_x;
	104	child_alloc.y = child->y - pizza->m_scroll_y;
	105	GtkRequisition req;
	106	gtk_widget_get_child_requisition(child->widget, &req);
	107	child_alloc.width = req.width;
	108	child_alloc.height = req.height;
	109	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	110	child_alloc.x = w - child_alloc.x - child_alloc.width;
	111	gtk_widget_size_allocate(child->widget, &child_alloc);
	112	}
	113	}
	114	}
	115
	116	static void realize(GtkWidget* widget)
	117	{
	118	parent_class->realize(widget);
	119
	120	wxPizza* pizza = WX_PIZZA(widget);
	121	if (pizza->m_border_style \|\| pizza->m_is_scrollable)
	122	{
	123	int border_x, border_y;
	124	pizza->get_border_widths(border_x, border_y);
	125	int x = widget->allocation.x + border_x;
	126	int y = widget->allocation.y + border_y;
	127	int w = widget->allocation.width - 2 * border_x;
	128	int h = widget->allocation.height - 2 * border_y;
	129	if (w < 0) w = 0;
	130	if (h < 0) h = 0;
	131	if (pizza->m_is_scrollable)
	132	{
	133	// second window is created if wxWindow is scrollable
	134	GdkWindowAttr attr;
	135	attr.event_mask = 0;
	136	attr.x = x;
	137	attr.y = y;
	138	attr.width = w;
	139	attr.height = h;
	140	attr.wclass = GDK_INPUT_OUTPUT;
	141	attr.visual = gtk_widget_get_visual(widget);
	142	attr.colormap = gtk_widget_get_colormap(widget);
	143	attr.window_type = GDK_WINDOW_CHILD;
	144
	145	pizza->m_backing_window = gdk_window_new(
	146	gdk_window_get_parent(widget->window),
	147	&attr,
	148	GDK_WA_X \| GDK_WA_Y \| GDK_WA_VISUAL \| GDK_WA_COLORMAP);
	149
	150	gdk_window_set_user_data(pizza->m_backing_window, widget);
	151	gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
	152	gdk_window_resize(widget->window, w, h);
	153
	154	// Parts of m_backing_window may be exposed temporarily while
	155	// resizing. Setting the backing pixmap to None prevents those
	156	// areas from being briefly painted black.
	157	gdk_window_set_back_pixmap(pizza->m_backing_window, NULL, false);
	158	}
	159	else
	160	gdk_window_move_resize(widget->window, x, y, w, h);
	161	}
	162	}
	163
	164	static void unrealize(GtkWidget* widget)
	165	{
	166	parent_class->unrealize(widget);
	167
	168	wxPizza* pizza = WX_PIZZA(widget);
	169	if (pizza->m_backing_window)
	170	{
	171	gdk_window_set_user_data(pizza->m_backing_window, NULL);
	172	gdk_window_destroy(pizza->m_backing_window);
	173	pizza->m_backing_window = NULL;
	174	}
	175	}
	176
	177	static void map(GtkWidget* widget)
	178	{
	179	parent_class->map(widget);
	180
	181	wxPizza* pizza = WX_PIZZA(widget);
	182	if (pizza->m_backing_window)
	183	gdk_window_show(pizza->m_backing_window);
	184	}
	185
	186	static void unmap(GtkWidget* widget)
	187	{
	188	parent_class->unmap(widget);
	189
	190	wxPizza* pizza = WX_PIZZA(widget);
	191	if (pizza->m_backing_window)
	192	gdk_window_hide(pizza->m_backing_window);
	193	}
	194
	195	// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
	196	static void set_scroll_adjustments(GtkWidget, GtkAdjustment, GtkAdjustment*)
	197	{
	198	}
	199
	200	// Marshaller needed for set_scroll_adjustments signal,
	201	// generated with GLib-2.4.6 glib-genmarshal
	202	#define g_marshal_value_peek_object(v) g_value_get_object (v)
	203	static void
	204	g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure *closure,
	205	GValue * /return_value/,
	206	guint n_param_values,
	207	const GValue *param_values,
	208	gpointer /invocation_hint/,
	209	gpointer marshal_data)
	210	{
	211	typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer data1,
	212	gpointer arg_1,
	213	gpointer arg_2,
	214	gpointer data2);
	215	register GMarshalFunc_VOID__OBJECT_OBJECT callback;
	216	register GCClosure cc = (GCClosure) closure;
	217	register gpointer data1, data2;
	218
	219	g_return_if_fail (n_param_values == 3);
	220
	221	if (G_CCLOSURE_SWAP_DATA (closure))
	222	{
	223	data1 = closure->data;
	224	data2 = g_value_peek_pointer (param_values + 0);
	225	}
	226	else
	227	{
	228	data1 = g_value_peek_pointer (param_values + 0);
	229	data2 = closure->data;
	230	}
	231	callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
	232
	233	callback (data1,
	234	g_marshal_value_peek_object (param_values + 1),
	235	g_marshal_value_peek_object (param_values + 2),
	236	data2);
	237	}
	238
	239	static void class_init(void* g_class, void*)
	240	{
	241	GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
	242	widget_class->size_allocate = size_allocate;
	243	widget_class->realize = realize;
	244	widget_class->unrealize = unrealize;
	245	widget_class->map = map;
	246	widget_class->unmap = unmap;
	247	wxPizzaClass* klass = (wxPizzaClass*)g_class;
	248
	249	// needed to make widget appear scrollable to GTK+
	250	klass->set_scroll_adjustments = set_scroll_adjustments;
	251	widget_class->set_scroll_adjustments_signal =
	252	g_signal_new(
	253	"set_scroll_adjustments",
	254	G_TYPE_FROM_CLASS(g_class),
	255	G_SIGNAL_RUN_LAST,
	256	G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
	257	NULL, NULL,
	258	g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
	259	G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
	260
	261	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
	262	}
	263
	264	} // extern "C"
	265
	266	GType wxPizza::type()
	267	{
	268	static GtkType type;
	269	if (type == 0)
	270	{
	271	const GTypeInfo info = {
	272	sizeof(wxPizzaClass),
	273	NULL, NULL,
	274	class_init,
	275	NULL, NULL,
	276	sizeof(wxPizza), 0,
	277	NULL, NULL
	278	};
	279	type = g_type_register_static(
	280	GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
	281	}
	282	return type;
	283	}
	284
	285	GtkWidget* wxPizza::New(long windowStyle,void* owner)
	286	{
	287	GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
	288	wxPizza* pizza = WX_PIZZA(widget);
	289	pizza->m_owner = owner;
	290	pizza->m_backing_window = NULL;
	291	pizza->m_scroll_x = 0;
	292	pizza->m_scroll_y = 0;
	293	pizza->m_is_scrollable = (windowStyle & (wxHSCROLL \| wxVSCROLL)) != 0;
	294	// mask off border styles not useable with wxPizza
	295	pizza->m_border_style = int(windowStyle & BORDER_STYLES);
	296	gtk_fixed_set_has_window(GTK_FIXED(widget), true);
	297	gtk_widget_add_events(widget,
	298	GDK_EXPOSURE_MASK \|
	299	GDK_SCROLL_MASK \|
	300	GDK_POINTER_MOTION_MASK \|
	301	GDK_POINTER_MOTION_HINT_MASK \|
	302	GDK_BUTTON_MOTION_MASK \|
	303	GDK_BUTTON1_MOTION_MASK \|
	304	GDK_BUTTON2_MOTION_MASK \|
	305	GDK_BUTTON3_MOTION_MASK \|
	306	GDK_BUTTON_PRESS_MASK \|
	307	GDK_BUTTON_RELEASE_MASK \|
	308	GDK_KEY_PRESS_MASK \|
	309	GDK_KEY_RELEASE_MASK \|
	310	GDK_ENTER_NOTIFY_MASK \|
	311	GDK_LEAVE_NOTIFY_MASK \|
	312	GDK_FOCUS_CHANGE_MASK);
	313	return widget;
	314	}
	315
	316	// gtk_fixed_move does not check for a change before issuing a queue_resize,
	317	// we need to avoid that to prevent endless sizing loops, so check first
	318	void wxPizza::move(GtkWidget* widget, int x, int y)
	319	{
	320	GtkFixed* fixed = &m_fixed;
	321	for (const GList* list = fixed->children; list; list = list->next)
	322	{
	323	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	324	if (child->widget == widget)
	325	{
	326	if (child->x != x \|\| child->y != y)
	327	gtk_fixed_move(fixed, widget, x, y);
	328	break;
	329	}
	330	}
	331	}
	332
	333	struct AdjustData {
	334	GdkWindow* window;
	335	int dx, dy;
	336	};
	337
	338	// Adjust allocations for all widgets using the GdkWindow which was just scrolled
	339	extern "C" {
	340	static void scroll_adjust(GtkWidget* widget, void* data)
	341	{
	342	const AdjustData* p = static_cast<AdjustData*>(data);
	343	widget->allocation.x += p->dx;
	344	widget->allocation.y += p->dy;
	345
	346	if (widget->window == p->window)
	347	{
	348	// GtkFrame requires a queue_resize, otherwise parts of
	349	// the frame newly exposed by the scroll are not drawn.
	350	// To be safe, do it for all widgets.
	351	gtk_widget_queue_resize_no_redraw(widget);
	352	if (GTK_IS_CONTAINER(widget))
	353	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, data);
	354	}
	355	}
	356	}
	357
	358	void wxPizza::scroll(int dx, int dy)
	359	{
	360	GtkWidget* widget = GTK_WIDGET(this);
	361	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	362	dx = -dx;
	363	m_scroll_x -= dx;
	364	m_scroll_y -= dy;
	365	if (widget->window)
	366	{
	367	gdk_window_scroll(widget->window, dx, dy);
	368	// Adjust child allocations. Doing a queue_resize on the children is not
	369	// enough, sometimes they redraw in the wrong place during fast scrolling.
	370	AdjustData data = { widget->window, dx, dy };
	371	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, &data);
	372	}
	373	}
	374
	375	void wxPizza::get_border_widths(int& x, int& y)
	376	{
	377	x = y = 0;
	378	if (m_border_style == 0)
	379	return;
	380
	381	#ifndef __WXUNIVERSAL__
	382	if (m_border_style & wxBORDER_SIMPLE)
	383	x = y = 1;
	384	else if (m_is_scrollable \|\| (m_border_style & wxBORDER_THEME))
	385	{
	386	GtkWidget *style_widget = wxGTKPrivate::GetTreeWidget();
	387
	388	if (style_widget->style)
	389	{
	390	x = style_widget->style->xthickness;
	391	y = style_widget->style->ythickness;
	392	}
	393	}
	394	else
	395	{
	396	GtkWidget *style_widget = wxGTKPrivate::GetEntryWidget();
	397
	398	if (style_widget->style)
	399	{
	400	x = style_widget->style->xthickness;
	401	y = style_widget->style->ythickness;
	402	}
	403	}
	404	#endif
	405	}