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gtk2/gtk/gtklayout.c
Jeff Garzik ba58aa201d Check args for NULL. (gtk_selection_default_handler): Replace manual list 
Thu Jan 21 17:13:12 1999  Jeff Garzik  <jgarzik@pobox.com>

        * gtk/gtkselection.c:
        (gtk_selection_property_notify): Check args for NULL.
        (gtk_selection_default_handler):
        Replace manual list count with call to g_list_length.
        Remove signedness of temp var 'count' to agree with usage.
        Slight spacing adjustment for readability.

        * gtk/gtkbox.c, gtk/gtklayout.c, gtk/gtkselection.c:
        Init a few ptrs to NULL, to quiet warnings.
1999-01-21 22:29:58 +00:00

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/* 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
*/
#include "gtklayout.h"
#include "gtksignal.h"
#include "gdk/gdkx.h"
static void gtk_layout_class_init (GtkLayoutClass *class);
static void gtk_layout_init (GtkLayout *layout);
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_realize_child (GtkLayout *layout,
GtkLayoutChild *child);
static void gtk_layout_position_child (GtkLayout *layout,
GtkLayoutChild *child,
gboolean force_allocate);
static void gtk_layout_position_children (GtkLayout *layout);
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 GdkFilterReturn gtk_layout_filter (GdkXEvent *gdk_xevent,
GdkEvent *event,
gpointer data);
static GdkFilterReturn gtk_layout_main_filter (GdkXEvent *gdk_xevent,
GdkEvent *event,
gpointer data);
static gboolean gtk_layout_gravity_works (void);
static void gtk_layout_set_static_gravity (GdkWindow *win,
gboolean op);
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);
}
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->window = NULL;
child->x = x;
child->y = y;
child->widget->requisition.width = 0;
child->widget->requisition.height = 0;
child->mapped = FALSE;
layout->children = g_list_append (layout->children, child);
gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
gtk_widget_size_request (child->widget, &child->widget->requisition);
if (GTK_WIDGET_REALIZED (layout) &&
!GTK_WIDGET_REALIZED (child_widget))
gtk_layout_realize_child (layout, child);
gtk_layout_position_child (layout, child, TRUE);
}
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;
if (child->widget == child_widget)
{
child->x = x;
child->y = y;
gtk_layout_position_child (layout, child, TRUE);
return;
}
tmp_list = tmp_list->next;
}
}
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);
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->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);
gravity_works = gtk_layout_gravity_works ();
container_class->remove = gtk_layout_remove;
container_class->forall = gtk_layout_forall;
class->set_scroll_adjustments = gtk_layout_set_adjustments;
}
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;
}
/* 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 = 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);
if (gravity_works)
gtk_layout_set_static_gravity (layout->bin_window, TRUE);
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);
gdk_window_add_filter (widget->window, gtk_layout_main_filter, layout);
gdk_window_add_filter (layout->bin_window, gtk_layout_filter, layout);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
if (GTK_WIDGET_VISIBLE (child->widget))
gtk_layout_realize_child (layout, child);
tmp_list = tmp_list->next;
}
}
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;
if (child->mapped && GTK_WIDGET_VISIBLE (child->widget))
{
if (!GTK_WIDGET_MAPPED (child->widget))
gtk_widget_map (child->widget);
if (child->window)
gdk_window_show (child->window);
}
tmp_list = tmp_list->next;
}
gdk_window_show (layout->bin_window);
gdk_window_show (widget->window);
}
static void
gtk_layout_unrealize (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);
tmp_list = layout->children;
gdk_window_set_user_data (layout->bin_window, NULL);
gdk_window_destroy (layout->bin_window);
layout->bin_window = NULL;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
if (child->window)
{
gdk_window_set_user_data (child->window, NULL);
gdk_window_destroy (child->window);
child->window = NULL;
}
tmp_list = tmp_list->next;
}
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
static void
gtk_layout_draw (GtkWidget *widget, GdkRectangle *area)
{
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (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;
gtk_widget_size_request (child->widget, &child->widget->requisition);
tmp_list = tmp_list->next;
}
}
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;
gtk_layout_position_child (layout, child, TRUE);
tmp_list = tmp_list->next;
}
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;
gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment), "changed");
layout->vadjustment->page_size = allocation->height;
layout->vadjustment->page_increment = allocation->height / 2;
gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment), "changed");
}
static gint
gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
{
GList *tmp_list;
GtkLayout *layout;
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;
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
if (event->window == child->window)
return gtk_widget_event (child->widget, (GdkEvent *)event);
tmp_list = tmp_list->next;
}
return FALSE;
}
/* 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)
{
if (child->window)
{
/* FIXME: This will cause problems for reparenting NO_WINDOW
* widgets out of a GtkLayout
*/
gdk_window_set_user_data (child->window, NULL);
gdk_window_destroy (child->window);
}
gtk_widget_unparent (widget);
layout->children = g_list_remove_link (layout->children, tmp_list);
g_list_free_1 (tmp_list);
g_free (child);
}
}
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_realize_child (GtkLayout *layout,
GtkLayoutChild *child)
{
GtkWidget *widget;
gint attributes_mask;
widget = GTK_WIDGET (layout);
if (GTK_WIDGET_NO_WINDOW (child->widget))
{
GdkWindowAttr attributes;
gint x = child->x - layout->xoffset;
gint y = child->y - layout->xoffset;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = x;
attributes.y = y;
attributes.width = child->widget->requisition.width;
attributes.height = child->widget->requisition.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = GDK_EXPOSURE_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
child->window = gdk_window_new (layout->bin_window,
&attributes, attributes_mask);
gdk_window_set_user_data (child->window, widget);
if (child->window)
gtk_style_set_background (widget->style,
child->window,
GTK_STATE_NORMAL);
}
gtk_widget_set_parent_window (child->widget,
child->window ? child->window : layout->bin_window);
gtk_widget_realize (child->widget);
if (gravity_works)
gtk_layout_set_static_gravity (child->window ? child->window : child->widget->window, TRUE);
}
static void
gtk_layout_position_child (GtkLayout *layout,
GtkLayoutChild *child,
gboolean force_allocate)
{
gint x;
gint y;
x = child->x - layout->xoffset;
y = child->y - layout->yoffset;
if ((x >= G_MINSHORT) && (x <= G_MAXSHORT) &&
(y >= G_MINSHORT) && (y <= G_MAXSHORT))
{
if (!child->mapped)
{
child->mapped = TRUE;
if (GTK_WIDGET_MAPPED (layout) &&
GTK_WIDGET_VISIBLE (child->widget))
{
if (child->window)
gdk_window_show (child->window);
if (!GTK_WIDGET_MAPPED (child->widget))
gtk_widget_map (child->widget);
child->mapped = TRUE;
force_allocate = TRUE;
}
}
if (force_allocate)
{
GtkAllocation allocation;
if (GTK_WIDGET_NO_WINDOW (child->widget))
{
if (child->window)
{
gdk_window_move_resize (child->window,
x, y,
child->widget->requisition.width,
child->widget->requisition.height);
}
allocation.x = 0;
allocation.y = 0;
}
else
{
allocation.x = x;
allocation.y = y;
}
allocation.width = child->widget->requisition.width;
allocation.height = child->widget->requisition.height;
gtk_widget_size_allocate (child->widget, &allocation);
}
}
else
{
if (child->mapped)
{
child->mapped = FALSE;
if (child->window)
gdk_window_hide (child->window);
else if (GTK_WIDGET_MAPPED (child->widget))
gtk_widget_unmap (child->widget);
}
}
}
static void
gtk_layout_position_children (GtkLayout *layout)
{
GList *tmp_list;
tmp_list = layout->children;
while (tmp_list)
{
gtk_layout_position_child (layout, tmp_list->data, FALSE);
tmp_list = tmp_list->next;
}
}
/* 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)
{
if (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);
}
}
/* This function is used to find events to process while scrolling
* Removing the GravityNotify events is a bit of a hack - currently
* GTK uses a lot of time processing them as GtkEventOther - a
* feature that is obsolete and will be removed. Until then...
*/
static Bool
gtk_layout_expose_predicate (Display *display,
XEvent *xevent,
XPointer arg)
{
if ((xevent->type == Expose) || (xevent->type == GravityNotify) ||
((xevent->xany.window == *(Window *)arg) &&
(xevent->type == ConfigureNotify)))
return True;
else
return False;
}
/* 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
*/
static void
gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
GtkLayout *layout)
{
GtkWidget *widget;
XEvent xevent;
gint dx, dy;
widget = GTK_WIDGET (layout);
dx = (gint)layout->hadjustment->value - layout->xoffset;
dy = (gint)layout->vadjustment->value - layout->yoffset;
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;
}
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
{
/* FIXME */
}
gtk_layout_expose_area (layout,
widget->allocation.width - dx,
0,
dx,
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
{
/* FIXME */
}
gtk_layout_expose_area (layout,
0,
0,
-dx,
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
{
/* FIXME */
}
gtk_layout_expose_area (layout,
0,
widget->allocation.height - dy,
widget->allocation.width,
dy);
}
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
{
/* FIXME */
}
gtk_layout_expose_area (layout,
0,
0,
widget->allocation.height,
-dy);
}
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();
while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (layout->bin_window),
&xevent,
gtk_layout_expose_predicate,
(XPointer)&GDK_WINDOW_XWINDOW (layout->bin_window)))
{
GdkEvent event;
GtkWidget *event_widget;
if ((xevent.xany.window == GDK_WINDOW_XWINDOW (layout->bin_window)) &&
(gtk_layout_filter (&xevent, &event, layout) == GDK_FILTER_REMOVE))
continue;
if (xevent.type == Expose)
{
event.expose.window = gdk_window_lookup (xevent.xany.window);
gdk_window_get_user_data (event.expose.window,
(gpointer *)&event_widget);
if (event_widget)
{
event.expose.type = GDK_EXPOSE;
event.expose.area.x = xevent.xexpose.x;
event.expose.area.y = xevent.xexpose.y;
event.expose.area.width = xevent.xexpose.width;
event.expose.area.height = xevent.xexpose.height;
event.expose.count = xevent.xexpose.count;
gdk_window_ref (event.expose.window);
gtk_widget_event (event_widget, &event);
gdk_window_unref (event.expose.window);
}
}
}
}
/* The main event filter. Actually, we probably don't really need
* to install this as a filter at all, since we are calling it
* directly above in the expose-handling hack. But in case scrollbars
* are fixed up in some manner...
*
* This routine identifies expose events that are generated when
* we've temporarily moved the bin_window_origin, and translates
* them or discards them, depending on whether we are obscured
* or not.
*/
static GdkFilterReturn
gtk_layout_filter (GdkXEvent *gdk_xevent,
GdkEvent *event,
gpointer data)
{
XEvent *xevent;
GtkLayout *layout;
xevent = (XEvent *)gdk_xevent;
layout = GTK_LAYOUT (data);
switch (xevent->type)
{
case Expose:
if (xevent->xexpose.serial == layout->configure_serial)
{
if (layout->visibility == GDK_VISIBILITY_UNOBSCURED)
return GDK_FILTER_REMOVE;
else
{
xevent->xexpose.x += layout->scroll_x;
xevent->xexpose.y += layout->scroll_y;
break;
}
}
break;
case ConfigureNotify:
if ((xevent->xconfigure.x != 0) || (xevent->xconfigure.y != 0))
{
layout->configure_serial = xevent->xconfigure.serial;
layout->scroll_x = xevent->xconfigure.x;
layout->scroll_y = xevent->xconfigure.y;
}
break;
}
return GDK_FILTER_CONTINUE;
}
/* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
* there is no corresponding event in GTK, so we have
* to get the events from a filter
*/
static GdkFilterReturn
gtk_layout_main_filter (GdkXEvent *gdk_xevent,
GdkEvent *event,
gpointer data)
{
XEvent *xevent;
GtkLayout *layout;
xevent = (XEvent *)gdk_xevent;
layout = GTK_LAYOUT (data);
if (xevent->type == VisibilityNotify)
{
switch (xevent->xvisibility.state)
{
case VisibilityFullyObscured:
layout->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
break;
case VisibilityPartiallyObscured:
layout->visibility = GDK_VISIBILITY_PARTIAL;
break;
case VisibilityUnobscured:
layout->visibility = GDK_VISIBILITY_UNOBSCURED;
break;
}
return GDK_FILTER_REMOVE;
}
return GDK_FILTER_CONTINUE;
}
/* Routines to set the window gravity, and check whether it is
* functional. Extra capabilities need to be added to GDK, so
* we don't have to use Xlib here.
*/
static void
gtk_layout_set_static_gravity (GdkWindow *win, gboolean on)
{
XSetWindowAttributes xattributes;
xattributes.win_gravity = on ? StaticGravity : NorthWestGravity;
xattributes.bit_gravity = on ? StaticGravity : NorthWestGravity;
XChangeWindowAttributes (GDK_WINDOW_XDISPLAY (win),
GDK_WINDOW_XWINDOW (win),
CWBitGravity | CWWinGravity,
&xattributes);
}
static gboolean
gtk_layout_gravity_works (void)
{
GdkWindowAttr attr;
GdkWindow *parent;
GdkWindow *child;
gint y;
/* This particular server apparently has a bug so that the test
* works but the actual code crashes it
*/
if ((!strcmp (XServerVendor (GDK_DISPLAY()), "Sun Microsystems, Inc.")) &&
(VendorRelease (GDK_DISPLAY()) == 3400))
return FALSE;
attr.window_type = GDK_WINDOW_TEMP;
attr.wclass = GDK_INPUT_OUTPUT;
attr.x = 0;
attr.y = 0;
attr.width = 100;
attr.height = 100;
attr.event_mask = 0;
parent = gdk_window_new (NULL, &attr, GDK_WA_X | GDK_WA_Y);
attr.window_type = GDK_WINDOW_CHILD;
child = gdk_window_new (parent, &attr, GDK_WA_X | GDK_WA_Y);
gtk_layout_set_static_gravity (parent, TRUE);
gtk_layout_set_static_gravity (child, TRUE);
gdk_window_resize (parent, 100, 110);
gdk_window_move (parent, 0, -10);
gdk_window_move_resize (parent, 0, 0, 100, 100);
gdk_window_resize (parent, 100, 110);
gdk_window_move (parent, 0, -10);
gdk_window_move_resize (parent, 0, 0, 100, 100);
gdk_window_get_geometry (child, NULL, &y, NULL, NULL, NULL);
gdk_window_destroy (parent);
gdk_window_destroy (child);
return (y == -20);
}
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