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;

static inline GdkWindow* get_backing_window(GtkWidget* widget)
{
    GdkWindow* w = NULL;
    if (widget->window && WX_PIZZA(widget)->m_is_scrollable)
        w = gdk_window_get_parent(widget->window);
    return w;
}

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
            GdkWindow* backing_window = gdk_window_get_parent(widget->window);
            gdk_window_move_resize(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_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;

            GdkWindow* 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(backing_window, widget);
            gdk_window_reparent(widget->window, backing_window, 0, 0);
            gdk_window_resize(widget->window, w, h);

            // Parts of 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(backing_window, NULL, false);
        }
        else
            gdk_window_move_resize(widget->window, x, y, w, h);
    }
}

static void unrealize(GtkWidget* widget)
{
    GdkWindow* backing_window = get_backing_window(widget);

    parent_class->unrealize(widget);

    if (backing_window)
    {
        gdk_window_set_user_data(backing_window, NULL);
        gdk_window_destroy(backing_window);
    }
}

static void map(GtkWidget* widget)
{
    GdkWindow* backing_window = get_backing_window(widget);
    if (backing_window)
        gdk_window_show(backing_window);

    parent_class->map(widget);
}

static void unmap(GtkWidget* widget)
{
    GdkWindow* backing_window = get_backing_window(widget);

    parent_class->unmap(widget);

    if (backing_window)
        gdk_window_hide(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_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	static inline GdkWindow* get_backing_window(GtkWidget* widget)
	34	{
	35	GdkWindow* w = NULL;
	36	if (widget->window && WX_PIZZA(widget)->m_is_scrollable)
	37	w = gdk_window_get_parent(widget->window);
	38	return w;
	39	}
	40
	41	extern "C" {
	42
	43	struct wxPizzaClass
	44	{
	45	GtkFixedClass parent;
	46	void (set_scroll_adjustments)(GtkWidget, GtkAdjustment, GtkAdjustment);
	47	};
	48
	49	static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
	50	{
	51	const bool is_resize =
	52	widget->allocation.width != alloc->width \|\|
	53	widget->allocation.height != alloc->height;
	54	const bool is_move =
	55	widget->allocation.x != alloc->x \|\|
	56	widget->allocation.y != alloc->y;
	57
	58	wxPizza* pizza = WX_PIZZA(widget);
	59	int border_x, border_y;
	60	pizza->get_border_widths(border_x, border_y);
	61	int w = alloc->width - 2 * border_x;
	62	if (w < 0) w = 0;
	63
	64	if (GTK_WIDGET_REALIZED(widget) && (is_move \|\| is_resize))
	65	{
	66	int h = alloc->height - 2 * border_y;
	67	if (h < 0) h = 0;
	68
	69	if (pizza->m_is_scrollable)
	70	{
	71	// two windows, both same size
	72	GdkWindow* backing_window = gdk_window_get_parent(widget->window);
	73	gdk_window_move_resize(backing_window,
	74	alloc->x + border_x, alloc->y + border_y, w, h);
	75	if (is_resize)
	76	gdk_window_resize(widget->window, w, h);
	77	}
	78	else
	79	{
	80	// one window
	81	gdk_window_move_resize(widget->window,
	82	alloc->x + border_x, alloc->y + border_y, w, h);
	83
	84	if (is_resize && (border_x \|\| border_y))
	85	{
	86	// old and new border areas need to be invalidated,
	87	// otherwise they will not be erased/redrawn properly
	88	const GtkAllocation& a1 = widget->allocation;
	89	const GtkAllocation& a2 = *alloc;
	90	GdkRectangle r1 = { a1.x, a1.y, a1.width, a1.height };
	91	GdkRectangle r2 = { a2.x, a2.y, a2.width, a2.height };
	92	gdk_window_invalidate_rect(widget->parent->window, &r1, false);
	93	gdk_window_invalidate_rect(widget->parent->window, &r2, false);
	94	}
	95	}
	96	}
	97
	98	widget->allocation = *alloc;
	99
	100	// adjust child positions
	101	for (const GList* list = pizza->m_fixed.children; list; list = list->next)
	102	{
	103	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	104	if (GTK_WIDGET_VISIBLE(child->widget))
	105	{
	106	GtkAllocation child_alloc;
	107	// note that child positions do not take border into
	108	// account, they need to be relative to widget->window,
	109	// which has already been adjusted
	110	child_alloc.x = child->x - pizza->m_scroll_x;
	111	child_alloc.y = child->y - pizza->m_scroll_y;
	112	GtkRequisition req;
	113	gtk_widget_get_child_requisition(child->widget, &req);
	114	child_alloc.width = req.width;
	115	child_alloc.height = req.height;
	116	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	117	child_alloc.x = w - child_alloc.x - child_alloc.width;
	118	gtk_widget_size_allocate(child->widget, &child_alloc);
	119	}
	120	}
	121	}
	122
	123	static void realize(GtkWidget* widget)
	124	{
	125	parent_class->realize(widget);
	126
	127	wxPizza* pizza = WX_PIZZA(widget);
	128	if (pizza->m_border_style \|\| pizza->m_is_scrollable)
	129	{
	130	int border_x, border_y;
	131	pizza->get_border_widths(border_x, border_y);
	132	int x = widget->allocation.x + border_x;
	133	int y = widget->allocation.y + border_y;
	134	int w = widget->allocation.width - 2 * border_x;
	135	int h = widget->allocation.height - 2 * border_y;
	136	if (w < 0) w = 0;
	137	if (h < 0) h = 0;
	138	if (pizza->m_is_scrollable)
	139	{
	140	// second window is created if wxWindow is scrollable
	141	GdkWindowAttr attr;
	142	attr.event_mask = 0;
	143	attr.x = x;
	144	attr.y = y;
	145	attr.width = w;
	146	attr.height = h;
	147	attr.wclass = GDK_INPUT_OUTPUT;
	148	attr.visual = gtk_widget_get_visual(widget);
	149	attr.colormap = gtk_widget_get_colormap(widget);
	150	attr.window_type = GDK_WINDOW_CHILD;
	151
	152	GdkWindow* backing_window = gdk_window_new(
	153	gdk_window_get_parent(widget->window),
	154	&attr,
	155	GDK_WA_X \| GDK_WA_Y \| GDK_WA_VISUAL \| GDK_WA_COLORMAP);
	156
	157	gdk_window_set_user_data(backing_window, widget);
	158	gdk_window_reparent(widget->window, backing_window, 0, 0);
	159	gdk_window_resize(widget->window, w, h);
	160
	161	// Parts of backing window may be exposed temporarily while
	162	// resizing. Setting the backing pixmap to None prevents those
	163	// areas from being briefly painted black.
	164	gdk_window_set_back_pixmap(backing_window, NULL, false);
	165	}
	166	else
	167	gdk_window_move_resize(widget->window, x, y, w, h);
	168	}
	169	}
	170
	171	static void unrealize(GtkWidget* widget)
	172	{
	173	GdkWindow* backing_window = get_backing_window(widget);
	174
	175	parent_class->unrealize(widget);
	176
	177	if (backing_window)
	178	{
	179	gdk_window_set_user_data(backing_window, NULL);
	180	gdk_window_destroy(backing_window);
	181	}
	182	}
	183
	184	static void map(GtkWidget* widget)
	185	{
	186	GdkWindow* backing_window = get_backing_window(widget);
	187	if (backing_window)
	188	gdk_window_show(backing_window);
	189
	190	parent_class->map(widget);
	191	}
	192
	193	static void unmap(GtkWidget* widget)
	194	{
	195	GdkWindow* backing_window = get_backing_window(widget);
	196
	197	parent_class->unmap(widget);
	198
	199	if (backing_window)
	200	gdk_window_hide(backing_window);
	201	}
	202
	203	// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
	204	static void set_scroll_adjustments(GtkWidget, GtkAdjustment, GtkAdjustment*)
	205	{
	206	}
	207
	208	// Marshaller needed for set_scroll_adjustments signal,
	209	// generated with GLib-2.4.6 glib-genmarshal
	210	#define g_marshal_value_peek_object(v) g_value_get_object (v)
	211	static void
	212	g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure *closure,
	213	GValue * /return_value/,
	214	guint n_param_values,
	215	const GValue *param_values,
	216	gpointer /invocation_hint/,
	217	gpointer marshal_data)
	218	{
	219	typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer data1,
	220	gpointer arg_1,
	221	gpointer arg_2,
	222	gpointer data2);
	223	register GMarshalFunc_VOID__OBJECT_OBJECT callback;
	224	register GCClosure cc = (GCClosure) closure;
	225	register gpointer data1, data2;
	226
	227	g_return_if_fail (n_param_values == 3);
	228
	229	if (G_CCLOSURE_SWAP_DATA (closure))
	230	{
	231	data1 = closure->data;
	232	data2 = g_value_peek_pointer (param_values + 0);
	233	}
	234	else
	235	{
	236	data1 = g_value_peek_pointer (param_values + 0);
	237	data2 = closure->data;
	238	}
	239	callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
	240
	241	callback (data1,
	242	g_marshal_value_peek_object (param_values + 1),
	243	g_marshal_value_peek_object (param_values + 2),
	244	data2);
	245	}
	246
	247	static void class_init(void* g_class, void*)
	248	{
	249	GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
	250	widget_class->size_allocate = size_allocate;
	251	widget_class->realize = realize;
	252	widget_class->unrealize = unrealize;
	253	widget_class->map = map;
	254	widget_class->unmap = unmap;
	255	wxPizzaClass* klass = (wxPizzaClass*)g_class;
	256
	257	// needed to make widget appear scrollable to GTK+
	258	klass->set_scroll_adjustments = set_scroll_adjustments;
	259	widget_class->set_scroll_adjustments_signal =
	260	g_signal_new(
	261	"set_scroll_adjustments",
	262	G_TYPE_FROM_CLASS(g_class),
	263	G_SIGNAL_RUN_LAST,
	264	G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
	265	NULL, NULL,
	266	g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
	267	G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
	268
	269	parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
	270	}
	271
	272	} // extern "C"
	273
	274	GType wxPizza::type()
	275	{
	276	static GtkType type;
	277	if (type == 0)
	278	{
	279	const GTypeInfo info = {
	280	sizeof(wxPizzaClass),
	281	NULL, NULL,
	282	class_init,
	283	NULL, NULL,
	284	sizeof(wxPizza), 0,
	285	NULL, NULL
	286	};
	287	type = g_type_register_static(
	288	GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
	289	}
	290	return type;
	291	}
	292
	293	GtkWidget* wxPizza::New(long windowStyle)
	294	{
	295	GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
	296	wxPizza* pizza = WX_PIZZA(widget);
	297	pizza->m_scroll_x = 0;
	298	pizza->m_scroll_y = 0;
	299	pizza->m_is_scrollable = (windowStyle & (wxHSCROLL \| wxVSCROLL)) != 0;
	300	// mask off border styles not useable with wxPizza
	301	pizza->m_border_style = int(windowStyle & BORDER_STYLES);
	302	gtk_fixed_set_has_window(GTK_FIXED(widget), true);
	303	gtk_widget_add_events(widget,
	304	GDK_EXPOSURE_MASK \|
	305	GDK_SCROLL_MASK \|
	306	GDK_POINTER_MOTION_MASK \|
	307	GDK_POINTER_MOTION_HINT_MASK \|
	308	GDK_BUTTON_MOTION_MASK \|
	309	GDK_BUTTON1_MOTION_MASK \|
	310	GDK_BUTTON2_MOTION_MASK \|
	311	GDK_BUTTON3_MOTION_MASK \|
	312	GDK_BUTTON_PRESS_MASK \|
	313	GDK_BUTTON_RELEASE_MASK \|
	314	GDK_KEY_PRESS_MASK \|
	315	GDK_KEY_RELEASE_MASK \|
	316	GDK_ENTER_NOTIFY_MASK \|
	317	GDK_LEAVE_NOTIFY_MASK \|
	318	GDK_FOCUS_CHANGE_MASK);
	319	return widget;
	320	}
	321
	322	// gtk_fixed_move does not check for a change before issuing a queue_resize,
	323	// we need to avoid that to prevent endless sizing loops, so check first
	324	void wxPizza::move(GtkWidget* widget, int x, int y)
	325	{
	326	GtkFixed* fixed = &m_fixed;
	327	for (const GList* list = fixed->children; list; list = list->next)
	328	{
	329	const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
	330	if (child->widget == widget)
	331	{
	332	if (child->x != x \|\| child->y != y)
	333	gtk_fixed_move(fixed, widget, x, y);
	334	break;
	335	}
	336	}
	337	}
	338
	339	struct AdjustData {
	340	GdkWindow* window;
	341	int dx, dy;
	342	};
	343
	344	// Adjust allocations for all widgets using the GdkWindow which was just scrolled
	345	extern "C" {
	346	static void scroll_adjust(GtkWidget* widget, void* data)
	347	{
	348	const AdjustData* p = static_cast<AdjustData*>(data);
	349	widget->allocation.x += p->dx;
	350	widget->allocation.y += p->dy;
	351
	352	if (widget->window == p->window)
	353	{
	354	// GtkFrame requires a queue_resize, otherwise parts of
	355	// the frame newly exposed by the scroll are not drawn.
	356	// To be safe, do it for all widgets.
	357	gtk_widget_queue_resize_no_redraw(widget);
	358	if (GTK_IS_CONTAINER(widget))
	359	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, data);
	360	}
	361	}
	362	}
	363
	364	void wxPizza::scroll(int dx, int dy)
	365	{
	366	GtkWidget* widget = GTK_WIDGET(this);
	367	if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
	368	dx = -dx;
	369	m_scroll_x -= dx;
	370	m_scroll_y -= dy;
	371	if (widget->window)
	372	{
	373	gdk_window_scroll(widget->window, dx, dy);
	374	// Adjust child allocations. Doing a queue_resize on the children is not
	375	// enough, sometimes they redraw in the wrong place during fast scrolling.
	376	AdjustData data = { widget->window, dx, dy };
	377	gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, &data);
	378	}
	379	}
	380
	381	void wxPizza::get_border_widths(int& x, int& y)
	382	{
	383	x = y = 0;
	384	if (m_border_style == 0)
	385	return;
	386
	387	#ifndef __WXUNIVERSAL__
	388	if (m_border_style & wxBORDER_SIMPLE)
	389	x = y = 1;
	390	else if (m_is_scrollable /* \|\| (m_border_style & wxBORDER_THEME) */)
	391	{
	392	GtkWidget *style_widget = wxGTKPrivate::GetTreeWidget();
	393
	394	if (style_widget->style)
	395	{
	396	x = style_widget->style->xthickness;
	397	y = style_widget->style->ythickness;
	398	}
	399	}
	400	else
	401	{
	402	GtkWidget *style_widget = wxGTKPrivate::GetEntryWidget();
	403
	404	if (style_widget->style)
	405	{
	406	x = style_widget->style->xthickness;
	407	y = style_widget->style->ythickness;
	408	}
	409	}
	410	#endif
	411	}