[PATCH] GtkLayout for Win32.
- From: Wolfgang Glas <Wolfgang Glas hfm tu-graz ac at>
- To: gtk-list redhat com
- Subject: [PATCH] GtkLayout for Win32.
- Date: Mon, 13 Sep 1999 11:50:22 +0200
Hi,
I just hacked out a rewrite gtklayout, which is running under Win32 at a first
glance.
I uploaded a patch to the gtk+-1.2.4 distribution to ftp.gimp.org and include
the whole source file gtklayout.c and a README file to this mail and hope, that
it turns out to be useful.
Wolfgang
--
Mag. Wolfgang Glas
Institut fuer hydraulische Stroemungsmaschinen
Kopernikusgasse 24 Phone:++43/316/873/7578
A-8010 Graz Fax: ++43/316/873/7577
mailto:Wolfgang.Glas@hfm.tu-graz.ac.at
http://fhysmsg01.tu-graz.ac.at/Wolfgang.Glas/
Patch for gtklayout.c of the gtk+-1.2.4 distribution.
Author: Wolfgang.Glas@hfm.tu-graz.ac.at
Problem fixed:
The Guffaw-scrolling of gtklayout.c was heavily dependent on X11 event calls,
which wasn't compatible with Win32.
Also Win32 does not support static Gravity, so I implemented a fallback
scrolling method, which works halfway, but I consider it to be useful because
I get good results with gtkplot-4.0 under Win32.
Technicalities:
This patch is an all-platform re-write of The guffaw-scrolling
in gtklayout.c.
As I can't handle configure events for the bin_window using gdk-calls,
I decided to mark
the temporary expose events from the scrolling by a contaminated
expose-event, which tells the expose-event handler to treat the temporary
exposures just the way that the original gtklayout.c did.
I also had to hack a facility to pop the expose events from the gdk
event stack instead of using X11-filters. This code should be replaced
by a gdk_event_... call, which works just like XCheckIfEvent or some
call which extends the possibilities of gdk_event_get_graphics_expose, which
is far too less flexible for the requirements of guffaw-scrolling.
I tested the patch under IRIX-6.5 with gcc-2.95.1 and under Win32
using Tor Lillquist's gtk+19990828 snapshot. My aim was to port an application
which uses gtkplot-4.0 to Win32, which succeeded with this patch.
At my advice the patch should be carefully tested with a set of X Servers
and platforms. Maybe the original author Mark Owen should also srtess-test
the new scrolling source in order to make it a reliable replacement for
the former version.
Wolfgang Glas
/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* GtkLayout: Widget for scrolling of arbitrary-sized areas.
*
* Copyright Owen Taylor, 1998
*/
/*
* Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "gtklayout.h"
#include "gtksignal.h"
#include "gtkprivate.h"
#include "gdk/gdkx.h"
typedef struct _GtkLayoutAdjData GtkLayoutAdjData;
typedef struct _GtkLayoutChild GtkLayoutChild;
struct _GtkLayoutAdjData {
gint dx;
gint dy;
};
struct _GtkLayoutChild {
GtkWidget *widget;
gint x;
gint y;
};
#define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
(y >= G_MINSHORT) && (y <= G_MAXSHORT))
/* a value for the width and height for 'salted' expose events,
which are used to mark temporary expose events from Guffaw-scrolling. */
#define EXPOSE_SALT ((guint16)-1)
/* a value for configure_serial, which tells us, that the handler
is processing the next expose event as a temporary one. */
#define CONFIGURE_SERIAL_ATTENTION (~(gulong)0)
static void gtk_layout_class_init (GtkLayoutClass *class);
static void gtk_layout_init (GtkLayout *layout);
static void gtk_layout_finalize (GtkObject *object);
static void gtk_layout_realize (GtkWidget *widget);
static void gtk_layout_unrealize (GtkWidget *widget);
static void gtk_layout_map (GtkWidget *widget);
static void gtk_layout_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_layout_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_layout_draw (GtkWidget *widget,
GdkRectangle *area);
static gint gtk_layout_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_layout_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_layout_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void gtk_layout_set_adjustments (GtkLayout *layout,
GtkAdjustment *hadj,
GtkAdjustment *vadj);
static void gtk_layout_position_child (GtkLayout *layout,
GtkLayoutChild *child);
static void gtk_layout_allocate_child (GtkLayout *layout,
GtkLayoutChild *child);
static void gtk_layout_position_children (GtkLayout *layout);
static void gtk_layout_adjust_allocations_recurse (GtkWidget *widget,
gpointer cb_data);
static void gtk_layout_adjust_allocations (GtkLayout *layout,
gint dx,
gint dy);
static void gtk_layout_expose_area (GtkLayout *layout,
gint x,
gint y,
gint width,
gint height);
static void gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
GtkLayout *layout);
static gint gtk_layout_visibility_notify (GtkWidget *widget,
GdkEventVisibility *event);
static void gtk_layout_send_salted_expose (GtkLayout *layout,
gint scroll_x,
gint scroll_y);
static GtkWidgetClass *parent_class = NULL;
static gboolean gravity_works;
/* Public interface
*/
GtkWidget*
gtk_layout_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkLayout *layout;
layout = gtk_type_new (GTK_TYPE_LAYOUT);
gtk_layout_set_adjustments (layout, hadjustment, vadjustment);
return GTK_WIDGET (layout);
}
GtkAdjustment*
gtk_layout_get_hadjustment (GtkLayout *layout)
{
g_return_val_if_fail (layout != NULL, NULL);
g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
return layout->hadjustment;
}
GtkAdjustment*
gtk_layout_get_vadjustment (GtkLayout *layout)
{
g_return_val_if_fail (layout != NULL, NULL);
g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
return layout->vadjustment;
}
static void
gtk_layout_set_adjustments (GtkLayout *layout,
GtkAdjustment *hadj,
GtkAdjustment *vadj)
{
gboolean need_adjust = FALSE;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
if (hadj)
g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
else
hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (vadj)
g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
else
vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (layout->hadjustment && (layout->hadjustment != hadj))
{
gtk_signal_disconnect_by_data (GTK_OBJECT (layout->hadjustment), layout);
gtk_object_unref (GTK_OBJECT (layout->hadjustment));
}
if (layout->vadjustment && (layout->vadjustment != vadj))
{
gtk_signal_disconnect_by_data (GTK_OBJECT (layout->vadjustment), layout);
gtk_object_unref (GTK_OBJECT (layout->vadjustment));
}
if (layout->hadjustment != hadj)
{
layout->hadjustment = hadj;
gtk_object_ref (GTK_OBJECT (layout->hadjustment));
gtk_object_sink (GTK_OBJECT (layout->hadjustment));
gtk_signal_connect (GTK_OBJECT (layout->hadjustment), "value_changed",
(GtkSignalFunc) gtk_layout_adjustment_changed,
layout);
need_adjust = TRUE;
}
if (layout->vadjustment != vadj)
{
layout->vadjustment = vadj;
gtk_object_ref (GTK_OBJECT (layout->vadjustment));
gtk_object_sink (GTK_OBJECT (layout->vadjustment));
gtk_signal_connect (GTK_OBJECT (layout->vadjustment), "value_changed",
(GtkSignalFunc) gtk_layout_adjustment_changed,
layout);
need_adjust = TRUE;
}
if (need_adjust)
gtk_layout_adjustment_changed (NULL, layout);
}
static void
gtk_layout_finalize (GtkObject *object)
{
GtkLayout *layout = GTK_LAYOUT (object);
gtk_object_unref (GTK_OBJECT (layout->hadjustment));
gtk_object_unref (GTK_OBJECT (layout->vadjustment));
GTK_OBJECT_CLASS (parent_class)->finalize (object);
}
void
gtk_layout_set_hadjustment (GtkLayout *layout,
GtkAdjustment *adjustment)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
gtk_layout_set_adjustments (layout, adjustment, layout->vadjustment);
}
void
gtk_layout_set_vadjustment (GtkLayout *layout,
GtkAdjustment *adjustment)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
gtk_layout_set_adjustments (layout, layout->hadjustment, adjustment);
}
void
gtk_layout_put (GtkLayout *layout,
GtkWidget *child_widget,
gint x,
gint y)
{
GtkLayoutChild *child;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
g_return_if_fail (child_widget != NULL);
g_return_if_fail (GTK_IS_WIDGET (child_widget));
child = g_new (GtkLayoutChild, 1);
child->widget = child_widget;
child->x = x;
child->y = y;
layout->children = g_list_append (layout->children, child);
gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
if (GTK_WIDGET_REALIZED (layout))
gtk_widget_set_parent_window (child->widget, layout->bin_window);
if (!IS_ONSCREEN (x, y))
GTK_PRIVATE_SET_FLAG (child_widget, GTK_IS_OFFSCREEN);
if (GTK_WIDGET_REALIZED (layout))
gtk_widget_realize (child_widget);
if (GTK_WIDGET_VISIBLE (layout) && GTK_WIDGET_VISIBLE (child_widget))
{
if (GTK_WIDGET_MAPPED (layout))
gtk_widget_map (child_widget);
gtk_widget_queue_resize (child_widget);
}
}
void
gtk_layout_move (GtkLayout *layout,
GtkWidget *child_widget,
gint x,
gint y)
{
GList *tmp_list;
GtkLayoutChild *child;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
tmp_list = layout->children;
while (tmp_list)
{
child = tmp_list->data;
tmp_list = tmp_list->next;
if (child->widget == child_widget)
{
child->x = x;
child->y = y;
if (GTK_WIDGET_VISIBLE (child_widget) && GTK_WIDGET_VISIBLE (layout))
gtk_widget_queue_resize (child_widget);
return;
}
}
}
void
gtk_layout_set_size (GtkLayout *layout,
guint width,
guint height)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
layout->width = width;
layout->height = height;
layout->hadjustment->upper = layout->width;
gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment), "changed");
layout->vadjustment->upper = layout->height;
gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment), "changed");
}
void
gtk_layout_freeze (GtkLayout *layout)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
layout->freeze_count++;
}
void
gtk_layout_thaw (GtkLayout *layout)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
if (layout->freeze_count)
if (!(--layout->freeze_count))
{
gtk_layout_position_children (layout);
gtk_widget_draw (GTK_WIDGET (layout), NULL);
}
}
/* Basic Object handling procedures
*/
GtkType
gtk_layout_get_type (void)
{
static GtkType layout_type = 0;
if (!layout_type)
{
static const GtkTypeInfo layout_info =
{
"GtkLayout",
sizeof (GtkLayout),
sizeof (GtkLayoutClass),
(GtkClassInitFunc) gtk_layout_class_init,
(GtkObjectInitFunc) gtk_layout_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL,
};
layout_type = gtk_type_unique (GTK_TYPE_CONTAINER, &layout_info);
}
return layout_type;
}
static void
gtk_layout_class_init (GtkLayoutClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
object_class->finalize = gtk_layout_finalize;
widget_class->realize = gtk_layout_realize;
widget_class->unrealize = gtk_layout_unrealize;
widget_class->map = gtk_layout_map;
widget_class->size_request = gtk_layout_size_request;
widget_class->size_allocate = gtk_layout_size_allocate;
widget_class->draw = gtk_layout_draw;
widget_class->expose_event = gtk_layout_expose;
widget_class->visibility_notify_event = gtk_layout_visibility_notify;
container_class->remove = gtk_layout_remove;
container_class->forall = gtk_layout_forall;
class->set_scroll_adjustments = gtk_layout_set_adjustments;
widget_class->set_scroll_adjustments_signal =
gtk_signal_new ("set_scroll_adjustments",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (GtkLayoutClass, set_scroll_adjustments),
gtk_marshal_NONE__POINTER_POINTER,
GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
}
static void
gtk_layout_init (GtkLayout *layout)
{
layout->children = NULL;
layout->width = 100;
layout->height = 100;
layout->hadjustment = NULL;
layout->vadjustment = NULL;
layout->bin_window = NULL;
layout->configure_serial = 0;
layout->scroll_x = 0;
layout->scroll_y = 0;
layout->visibility = GDK_VISIBILITY_PARTIAL;
layout->freeze_count = 0;
gtk_signal_connect (GTK_OBJECT (layout), "expose_event",
(GtkSignalFunc) gtk_layout_expose,
layout);
}
/* Widget methods
*/
static void
gtk_layout_realize (GtkWidget *widget)
{
GList *tmp_list;
GtkLayout *layout;
GdkWindowAttr attributes;
gint attributes_mask;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (widget->window, widget);
attributes.x = 0;
attributes.y = 0;
attributes.event_mask = GDK_EXPOSURE_MASK |
gtk_widget_get_events (widget);
layout->bin_window = gdk_window_new (widget->window,
&attributes, attributes_mask);
gdk_window_set_user_data (layout->bin_window, widget);
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);
/* XXX: If we ever get multiple displays for GTK+, then gravity_works
* will have to become a widget member. Right now we just
* keep it as a global
*/
gravity_works = gdk_window_set_static_gravities (layout->bin_window, TRUE);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
gtk_widget_set_parent_window (child->widget, layout->bin_window);
}
}
static void
gtk_layout_map (GtkWidget *widget)
{
GList *tmp_list;
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
if (GTK_WIDGET_VISIBLE (child->widget))
{
if (!GTK_WIDGET_MAPPED (child->widget) &&
!GTK_WIDGET_IS_OFFSCREEN (child->widget))
gtk_widget_map (child->widget);
}
}
gdk_window_show (layout->bin_window);
gdk_window_show (widget->window);
}
static void
gtk_layout_unrealize (GtkWidget *widget)
{
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
gdk_window_set_user_data (layout->bin_window, NULL);
gdk_window_destroy (layout->bin_window);
layout->bin_window = NULL;
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
static void
gtk_layout_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GList *tmp_list;
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
requisition->width = 0;
requisition->height = 0;
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
GtkRequisition child_requisition;
tmp_list = tmp_list->next;
gtk_widget_size_request (child->widget, &child_requisition);
}
}
static void
gtk_layout_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GList *tmp_list;
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
widget->allocation = *allocation;
layout = GTK_LAYOUT (widget);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
gtk_layout_position_child (layout, child);
gtk_layout_allocate_child (layout, child);
}
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_move_resize (widget->window,
allocation->x, allocation->y,
allocation->width, allocation->height);
gdk_window_move_resize (GTK_LAYOUT(widget)->bin_window,
0, 0,
allocation->width, allocation->height);
}
layout->hadjustment->page_size = allocation->width;
layout->hadjustment->page_increment = allocation->width / 2;
layout->hadjustment->lower = 0;
layout->hadjustment->upper = layout->width;
gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment), "changed");
layout->vadjustment->page_size = allocation->height;
layout->vadjustment->page_increment = allocation->height / 2;
layout->vadjustment->lower = 0;
layout->vadjustment->upper = layout->height;
gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment), "changed");
/* check, whether we have to correct the placement */
if (layout->hadjustment->value &&
layout->hadjustment->value + layout->hadjustment->page_size >
layout->hadjustment->upper )
{
/* move to the bottom, if the size of the layout
is smaller than the the size of the bin_window.
Otherwise, just choose a default placement on the top */
if (layout->hadjustment->upper > layout->hadjustment->page_size)
layout->hadjustment->value =
layout->hadjustment->upper - layout->hadjustment->page_size;
else
layout->hadjustment->value = 0;
gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment),
"value-changed" );
}
if (layout->vadjustment->value &&
layout->vadjustment->value + layout->vadjustment->page_size >
layout->vadjustment->upper )
{
/* move to the right, if the size of the layout
is smaller than the the size of the bin_window.
Otherwise, just choose a default placement on the left */
if (layout->vadjustment->upper > layout->vadjustment->page_size)
layout->vadjustment->value =
layout->vadjustment->upper - layout->vadjustment->page_size;
else
layout->vadjustment->value = 0;
gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment),
"value-changed" );
}
}
static void
gtk_layout_draw (GtkWidget *widget, GdkRectangle *area)
{
GList *tmp_list;
GtkLayout *layout;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
/* We don't have any way of telling themes about this properly,
* so we just assume a background pixmap
*/
if (!GTK_WIDGET_APP_PAINTABLE (widget))
gdk_window_clear_area (layout->bin_window,
area->x, area->y, area->width, area->height);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
if (gtk_widget_intersect (child->widget, area, &child_area))
gtk_widget_draw (child->widget, &child_area);
}
}
static gint
gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
{
GList *tmp_list;
GtkLayout *layout;
GdkEventExpose child_event;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_LAYOUT (widget), FALSE);
layout = GTK_LAYOUT (widget);
if (event->window != layout->bin_window)
return FALSE;
/* if we receive a salted event, be care ful in the next turn. */
if (event->area.width == EXPOSE_SALT && event->area.height == EXPOSE_SALT)
{
layout->scroll_x = event->area.x;
layout->scroll_y = event->area.y;
layout->configure_serial = CONFIGURE_SERIAL_ATTENTION;
return TRUE;
}
/* look out for temporary expose events */
if (layout->configure_serial)
{
/* Unfortunately some Xservers set the count field for all expose events
from one suite to the total number of events in that suite,
so that ine can't just query for the count field to be zero.
I chose to store the number of expose events in the suite
in configure_serial and to decrease the number with each incoming
event.*/
/* first temp. event caught
--> save the number of following temp. events */
if (layout->configure_serial == CONFIGURE_SERIAL_ATTENTION)
layout->configure_serial = event->count;
else
/* successor of first temporary event caught
--> decrease the number of follows-ups. */
layout->configure_serial--;
/* In we are totally visible, we trust our own expose event,
discard the temporary. */
if (layout->visibility == GDK_VISIBILITY_UNOBSCURED)
return TRUE;
/* correct the position to be in phase with the scrolling. */
event->area.x += layout->scroll_x;
event->area.y += layout->scroll_y;
}
/* Hand the event down to the children. */
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
child_event = *event;
if (GTK_WIDGET_DRAWABLE (child->widget) &&
GTK_WIDGET_NO_WINDOW (child->widget) &&
gtk_widget_intersect (child->widget, &event->area, &child_event.area))
gtk_widget_event (child->widget, (GdkEvent*) &child_event);
}
return FALSE;
}
/* get the visibility from an ordinary GTK callback */
static gint
gtk_layout_visibility_notify (GtkWidget *widget, GdkEventVisibility *event)
{
GTK_LAYOUT (widget)->visibility = event->state;
return TRUE;
}
/* Container method
*/
static void
gtk_layout_remove (GtkContainer *container,
GtkWidget *widget)
{
GList *tmp_list;
GtkLayout *layout;
GtkLayoutChild *child = NULL;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_LAYOUT (container));
layout = GTK_LAYOUT (container);
tmp_list = layout->children;
while (tmp_list)
{
child = tmp_list->data;
if (child->widget == widget)
break;
tmp_list = tmp_list->next;
}
if (tmp_list)
{
gtk_widget_unparent (widget);
layout->children = g_list_remove_link (layout->children, tmp_list);
g_list_free_1 (tmp_list);
g_free (child);
}
GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
}
static void
gtk_layout_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkLayout *layout;
GtkLayoutChild *child;
GList *tmp_list;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_LAYOUT (container));
g_return_if_fail (callback != NULL);
layout = GTK_LAYOUT (container);
tmp_list = layout->children;
while (tmp_list)
{
child = tmp_list->data;
tmp_list = tmp_list->next;
(* callback) (child->widget, callback_data);
}
}
/* Operations on children
*/
static void
gtk_layout_position_child (GtkLayout *layout,
GtkLayoutChild *child)
{
gint x;
gint y;
x = child->x - layout->xoffset;
y = child->y - layout->yoffset;
if (IS_ONSCREEN (x,y))
{
if (GTK_WIDGET_MAPPED (layout) &&
GTK_WIDGET_VISIBLE (child->widget))
{
if (!GTK_WIDGET_MAPPED (child->widget))
gtk_widget_map (child->widget);
}
if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
}
else
{
if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
if (GTK_WIDGET_MAPPED (child->widget))
gtk_widget_unmap (child->widget);
}
}
static void
gtk_layout_allocate_child (GtkLayout *layout,
GtkLayoutChild *child)
{
GtkAllocation allocation;
GtkRequisition requisition;
allocation.x = child->x - layout->xoffset;
allocation.y = child->y - layout->yoffset;
gtk_widget_get_child_requisition (child->widget, &requisition);
allocation.width = requisition.width;
allocation.height = requisition.height;
gtk_widget_size_allocate (child->widget, &allocation);
}
static void
gtk_layout_position_children (GtkLayout *layout)
{
GList *tmp_list;
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
gtk_layout_position_child (layout, child);
}
}
static void
gtk_layout_adjust_allocations_recurse (GtkWidget *widget,
gpointer cb_data)
{
GtkLayoutAdjData *data = cb_data;
widget->allocation.x += data->dx;
widget->allocation.y += data->dy;
if (GTK_WIDGET_NO_WINDOW (widget) &&
GTK_IS_CONTAINER (widget))
gtk_container_forall (GTK_CONTAINER (widget),
gtk_layout_adjust_allocations_recurse,
cb_data);
}
static void
gtk_layout_adjust_allocations (GtkLayout *layout,
gint dx,
gint dy)
{
GList *tmp_list;
GtkLayoutAdjData data;
data.dx = dx;
data.dy = dy;
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
child->widget->allocation.x += dx;
child->widget->allocation.y += dy;
if (GTK_WIDGET_NO_WINDOW (child->widget) &&
GTK_IS_CONTAINER (child->widget))
gtk_container_forall (GTK_CONTAINER (child->widget),
gtk_layout_adjust_allocations_recurse,
&data);
}
}
/* Callbacks */
/* Send a synthetic expose event to the widget
*/
static void
gtk_layout_expose_area (GtkLayout *layout,
gint x, gint y, gint width, gint height)
{
/* Always send the expose, if static gravity does not work. */
if (!gravity_works ||
layout->visibility == GDK_VISIBILITY_UNOBSCURED)
{
GdkEventExpose event;
event.type = GDK_EXPOSE;
event.send_event = TRUE;
event.window = layout->bin_window;
event.count = 0;
event.area.x = x;
event.area.y = y;
event.area.width = width;
event.area.height = height;
gdk_window_ref (event.window);
gtk_widget_event (GTK_WIDGET (layout), (GdkEvent *)&event);
gdk_window_unref (event.window);
}
}
/* Send a 'salted' expose event to the widget, which contains the
information about how much the following expose events must be
offset. This information is used if the bin_window is partial visible
to correct the expose events from Guffaw-scrolling.
If the bin_window is totally visible, the following expose events are
discarded and replaced by an expose event from gtk_layout_expose_area.
*/
static void gtk_layout_send_salted_expose (GtkLayout *layout,
gint scroll_x,
gint scroll_y)
{
GdkEventExpose event;
event.type = GDK_EXPOSE;
event.send_event = TRUE;
event.window = layout->bin_window;
event.count = 0;
event.area.x = scroll_x;
event.area.y = scroll_y;
event.area.width = EXPOSE_SALT;
event.area.height = EXPOSE_SALT;
gdk_window_ref (event.window);
gtk_widget_event (GTK_WIDGET (layout), (GdkEvent *)&event);
gdk_window_unref (event.window);
}
/* This is the main routine to do the scrolling. Scrolling is
* done by "Guffaw" scrolling, as in the Mozilla XFE, with
* a few modifications.
*
* The main improvement is that we keep track of whether we
* are obscured or not. If not, we ignore the generated expose
* events and instead do the exposes ourself, without having
* to wait for a roundtrip to the server. This also provides
* a limited form of expose-event compression, since we do
* the affected area as one big chunk.
*
* Real expose event compression, as in the XFE, could be added
* here. It would help opaque drags over the region, and the
* obscured case.
*
* Code needs to be added here to do the scrolling on machines
* that don't have working WindowGravity. That could be done
*
* - XCopyArea and move the windows, and accept trailing the
* background color. (Since it is only a fallback method)
* - XmHTML style. As above, but turn off expose events when
* not obscured and do the exposures ourself.
* - gzilla-style. Move the window continuously, and reset
* every 32768 pixels
*
* For now I've implemented the first approach, which is necessary for
* running the code on Win32. It seems to run for classes, which are
* derived from GtkLayout, but if child widgets are present it's far from
* being perfect. (Wolfgang.Glas@hfm.tu-graz.ac.at 1999-07-09)
*
*/
static void
gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
GtkLayout *layout)
{
GtkWidget *widget;
GdkEvent *event;
GList *event_stack = NULL;
gint dx, dy;
widget = GTK_WIDGET (layout);
dx = (gint)layout->hadjustment->value - layout->xoffset;
dy = (gint)layout->vadjustment->value - layout->yoffset;
/* We have to mark the following expose events as temporary by sending
a salted event containing the offset for the expose events */
if (gravity_works && GTK_WIDGET_MAPPED (layout))
gtk_layout_send_salted_expose (layout,
dx>0 ? -dx : 0,
dy>0 ? -dy : 0);
layout->xoffset = (gint)layout->hadjustment->value;
layout->yoffset = (gint)layout->vadjustment->value;
if (layout->freeze_count)
return;
if (!GTK_WIDGET_MAPPED (layout))
{
gtk_layout_position_children (layout);
return;
}
gtk_layout_adjust_allocations (layout, -dx, -dy);
if (dx > 0)
{
if (gravity_works)
{
gdk_window_resize (layout->bin_window,
widget->allocation.width + dx,
widget->allocation.height);
gdk_window_move (layout->bin_window, -dx, 0);
gdk_window_move_resize (layout->bin_window,
0, 0,
widget->allocation.width,
widget->allocation.height);
}
else
{
gdk_window_copy_area (layout->bin_window,
GTK_WIDGET(layout)->style->fg_gc[0],
0,0,
layout->bin_window,
dx,0,
MAX ((gint)widget->allocation.width - dx, 0),
widget->allocation.height);
}
gtk_layout_expose_area (layout,
MAX ((gint)widget->allocation.width - dx, 0),
0,
MIN (dx, widget->allocation.width),
widget->allocation.height);
}
else if (dx < 0)
{
if (gravity_works)
{
gdk_window_move_resize (layout->bin_window,
dx, 0,
widget->allocation.width - dx,
widget->allocation.height);
gdk_window_move (layout->bin_window, 0, 0);
gdk_window_resize (layout->bin_window,
widget->allocation.width,
widget->allocation.height);
}
else
{
gdk_window_copy_area (layout->bin_window,
GTK_WIDGET(layout)->style->fg_gc[0],
-dx,0,
layout->bin_window,
0,0,
MAX ((gint)widget->allocation.width + dx, 0),
widget->allocation.height);
}
gtk_layout_expose_area (layout,
0,
0,
MIN (-dx, widget->allocation.width),
widget->allocation.height);
}
if (dy > 0)
{
if (gravity_works)
{
gdk_window_resize (layout->bin_window,
widget->allocation.width,
widget->allocation.height + dy);
gdk_window_move (layout->bin_window, 0, -dy);
gdk_window_move_resize (layout->bin_window,
0, 0,
widget->allocation.width,
widget->allocation.height);
}
else
{
gdk_window_copy_area (layout->bin_window,
GTK_WIDGET(layout)->style->fg_gc[0],
0,0,
layout->bin_window,
0,dy,
widget->allocation.width,
MAX ((gint)widget->allocation.height - dy, 0));
}
gtk_layout_expose_area (layout,
0,
MAX ((gint)widget->allocation.height - dy, 0),
widget->allocation.width,
MIN (dy, widget->allocation.height));
}
else if (dy < 0)
{
if (gravity_works)
{
gdk_window_move_resize (layout->bin_window,
0, dy,
widget->allocation.width,
widget->allocation.height - dy);
gdk_window_move (layout->bin_window, 0, 0);
gdk_window_resize (layout->bin_window,
widget->allocation.width,
widget->allocation.height);
}
else
{
gdk_window_copy_area (layout->bin_window,
GTK_WIDGET(layout)->style->fg_gc[0],
0,-dy,
layout->bin_window,
0,0,
widget->allocation.width,
MAX ((gint)widget->allocation.height + dy, 0));
}
gtk_layout_expose_area (layout,
0,
0,
widget->allocation.width,
MIN (-dy, (gint)widget->allocation.height));
}
gtk_layout_position_children (layout);
/* We have to make sure that all exposes from this scroll get
* processed before we scroll again, or the expose events will
* have invalid coordinates.
*
* We also do expose events for other windows, since otherwise
* their updating will fall behind the scrolling
*
* This also avoids a problem in pre-1.0 GTK where filters don't
* have access to configure events that were compressed.
*/
gdk_flush();
/* The following loops are a bit of a hack to extract the expose
* events without using any X11-function. I pop all events from
* gdk's event stack, process the expose events and store the rest
* in a local event_stack.
*
* Afterwards I put back the event on my stack to gdk's stack.
*
* Obviously, this should be included in the functionality of
* gdk's event handling, but it isn't by now (gtk+-1.2.4).
*/
while ((event=gdk_event_get()) != NULL)
{
if (event -> type == GDK_EXPOSE)
{
GtkWidget *event_widget;
gdk_window_get_user_data (event->expose.window,
(gpointer *)&event_widget);
gdk_window_ref(event->expose.window);
gtk_widget_event(event_widget,event);
gdk_window_unref(event->expose.window);
gdk_event_free(event);
}
else
event_stack = g_list_append (event_stack, event);
}
while (event_stack)
{
event = (GdkEvent *) event_stack->data;
event_stack = g_list_remove_link (event_stack,event_stack);
gdk_event_put(event);
gdk_event_free(event);
}
}
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