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gtk2/gtk/gtkviewport.c
Owen Taylor ef33adff83 Add a 'type' parameter, make public. 
Thu Oct  3 14:13:33 2002  Owen Taylor  <otaylor@redhat.com>

        * gdk/gdkevents.c (gdk_event_new): Add a 'type'
        parameter, make public.

        * gdk/gdkevents.c (gdk_event_copy): Copy the screen.

        * gdk/gdkevents.c gdk/linux-fb/gdkmain-fb.c
        gdk/x11/gdkevents-x11.c gdk/win32/gdkevents-win32.c:
        _gdk_event_new() => gdk_event_new().

        * gdk/win32/gdkevents-win32.c (real_window_procedure):
        Fix event_private->screen breakage that results from evil
        encapsulation breakage here.

        * gtk/gtkclist.c gtk/gtkcombo.c gtk/gtkcontainer.c
        gtk/gtkdialog.c gtk/gtkdnd.c gtk/gtkdrawingarea.c
        gtk/gtkimcontextsimple.c gtk/gtklist.c gtk/gtkmenu.c
        gtk/gtknotebook.c gtk/gtkplug.c gtk/gtkselection.c
        gtk/gtktext.c gtk/gtktreeitem.c gtk/gtktreeview.c
        gtk/gtkviewport.c gtk/gtkwindow-decorate.c gtk/gtkwindow.c
        tests/testgtk.c: Remove most usage of stack-allocated
        GdkEvent structures.

        * gtk/gtktreeview.c: Use a cut-and-paste of the full
        send_focus_event() from gtkwindow.c that does the necessary
        notification of the ::has-focus property and setting of
        the HAS_FOCUS flag.x

        * gtk/gtkdnd.c: Clean up some mess/duplicated code; removing
        an extraneous use of a GdkEvent.
2002-10-03 20:53:30 +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 Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. 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 "gtksignal.h"
#include "gtkviewport.h"
#include "gtkintl.h"
#include "gtkmarshalers.h"
enum {
PROP_0,
PROP_HADJUSTMENT,
PROP_VADJUSTMENT,
PROP_SHADOW_TYPE
};
static void gtk_viewport_class_init (GtkViewportClass *klass);
static void gtk_viewport_init (GtkViewport *viewport);
static void gtk_viewport_destroy (GtkObject *object);
static void gtk_viewport_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_viewport_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment);
static void gtk_viewport_realize (GtkWidget *widget);
static void gtk_viewport_unrealize (GtkWidget *widget);
static void gtk_viewport_paint (GtkWidget *widget,
GdkRectangle *area);
static gint gtk_viewport_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_viewport_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_viewport_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_viewport_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
gpointer data);
static void gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer data);
static void gtk_viewport_style_set (GtkWidget *widget,
GtkStyle *previous_style);
static GtkBinClass *parent_class;
GtkType
gtk_viewport_get_type (void)
{
static GtkType viewport_type = 0;
if (!viewport_type)
{
static const GtkTypeInfo viewport_info =
{
"GtkViewport",
sizeof (GtkViewport),
sizeof (GtkViewportClass),
(GtkClassInitFunc) gtk_viewport_class_init,
(GtkObjectInitFunc) gtk_viewport_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
viewport_type = gtk_type_unique (GTK_TYPE_BIN, &viewport_info);
}
return viewport_type;
}
static void
gtk_viewport_class_init (GtkViewportClass *class)
{
GtkObjectClass *object_class;
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
object_class = (GtkObjectClass*) class;
gobject_class = G_OBJECT_CLASS (class);
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
gobject_class->set_property = gtk_viewport_set_property;
gobject_class->get_property = gtk_viewport_get_property;
object_class->destroy = gtk_viewport_destroy;
widget_class->realize = gtk_viewport_realize;
widget_class->unrealize = gtk_viewport_unrealize;
widget_class->expose_event = gtk_viewport_expose;
widget_class->size_request = gtk_viewport_size_request;
widget_class->size_allocate = gtk_viewport_size_allocate;
widget_class->style_set = gtk_viewport_style_set;
container_class->add = gtk_viewport_add;
class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
g_object_class_install_property (gobject_class,
PROP_HADJUSTMENT,
g_param_spec_object ("hadjustment",
_("Horizontal adjustment"),
_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
GTK_TYPE_ADJUSTMENT,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_VADJUSTMENT,
g_param_spec_object ("vadjustment",
_("Vertical adjustment"),
_("The GtkAdjustment that determines the values of the vertical position for this viewport"),
GTK_TYPE_ADJUSTMENT,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_SHADOW_TYPE,
g_param_spec_enum ("shadow_type",
_("Shadow type"),
_("Determines how the shadowed box around the viewport is drawn"),
GTK_TYPE_SHADOW_TYPE,
GTK_SHADOW_IN,
G_PARAM_READWRITE));
widget_class->set_scroll_adjustments_signal =
gtk_signal_new ("set_scroll_adjustments",
GTK_RUN_LAST,
GTK_CLASS_TYPE (object_class),
GTK_SIGNAL_OFFSET (GtkViewportClass, set_scroll_adjustments),
_gtk_marshal_VOID__OBJECT_OBJECT,
GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
}
static void
gtk_viewport_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkViewport *viewport;
viewport = GTK_VIEWPORT (object);
switch (prop_id)
{
case PROP_HADJUSTMENT:
gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
break;
case PROP_VADJUSTMENT:
gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
break;
case PROP_SHADOW_TYPE:
gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_viewport_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkViewport *viewport;
viewport = GTK_VIEWPORT (object);
switch (prop_id)
{
case PROP_HADJUSTMENT:
g_value_set_object (value, viewport->hadjustment);
break;
case PROP_VADJUSTMENT:
g_value_set_object (value, viewport->vadjustment);
break;
case PROP_SHADOW_TYPE:
g_value_set_enum (value, viewport->shadow_type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_viewport_init (GtkViewport *viewport)
{
GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
viewport->shadow_type = GTK_SHADOW_IN;
viewport->view_window = NULL;
viewport->bin_window = NULL;
viewport->hadjustment = NULL;
viewport->vadjustment = NULL;
}
/**
* gtk_viewport_new:
* @hadjustment: horizontal adjustment.
* @vadjustment: vertical adjustment.
* @returns: a new #GtkViewport.
*
* Creates a new #GtkViewport with the given adjustments.
*
**/
GtkWidget*
gtk_viewport_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkWidget *viewport;
viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
"hadjustment", hadjustment,
"vadjustment", vadjustment,
NULL);
return viewport;
}
static void
gtk_viewport_destroy (GtkObject *object)
{
GtkViewport *viewport = GTK_VIEWPORT (object);
if (viewport->hadjustment)
{
gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
viewport->hadjustment = NULL;
}
if (viewport->vadjustment)
{
gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
viewport->vadjustment = NULL;
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
/**
* gtk_viewport_get_hadjustment:
* @viewport: a #GtkViewport.
*
* Returns the horizontal adjustment of the viewport.
*
* Return value: the horizontal adjustment of @viewport.
**/
GtkAdjustment*
gtk_viewport_get_hadjustment (GtkViewport *viewport)
{
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
if (!viewport->hadjustment)
gtk_viewport_set_hadjustment (viewport, NULL);
return viewport->hadjustment;
}
/**
* gtk_viewport_get_vadjustment:
* @viewport: a #GtkViewport.
*
* Returns the vertical adjustment of the viewport.
*
* Return value: the vertical adjustment of @viewport.
**/
GtkAdjustment*
gtk_viewport_get_vadjustment (GtkViewport *viewport)
{
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
if (!viewport->vadjustment)
gtk_viewport_set_vadjustment (viewport, NULL);
return viewport->vadjustment;
}
/**
* gtk_viewport_set_hadjustment:
* @viewport: a #GtkViewport.
* @adjustment: a #GtkAdjustment.
*
* Sets the horizontal adjustment of the viewport.
**/
void
gtk_viewport_set_hadjustment (GtkViewport *viewport,
GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (viewport->hadjustment && viewport->hadjustment != adjustment)
{
gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
viewport->hadjustment = NULL;
}
if (!adjustment)
adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
0.0, 0.0, 0.0));
if (viewport->hadjustment != adjustment)
{
viewport->hadjustment = adjustment;
gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
(GtkSignalFunc) gtk_viewport_adjustment_changed,
(gpointer) viewport);
gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
(GtkSignalFunc) gtk_viewport_adjustment_value_changed,
(gpointer) viewport);
gtk_viewport_adjustment_changed (adjustment, viewport);
}
g_object_notify (G_OBJECT (viewport), "hadjustment");
}
/**
* gtk_viewport_set_vadjustment:
* @viewport: a #GtkViewport.
* @adjustment: a #GtkAdjustment.
*
* Sets the vertical adjustment of the viewport.
**/
void
gtk_viewport_set_vadjustment (GtkViewport *viewport,
GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (viewport->vadjustment && viewport->vadjustment != adjustment)
{
gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
viewport->vadjustment = NULL;
}
if (!adjustment)
adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
0.0, 0.0, 0.0));
if (viewport->vadjustment != adjustment)
{
viewport->vadjustment = adjustment;
gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
(GtkSignalFunc) gtk_viewport_adjustment_changed,
(gpointer) viewport);
gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
(GtkSignalFunc) gtk_viewport_adjustment_value_changed,
(gpointer) viewport);
gtk_viewport_adjustment_changed (adjustment, viewport);
}
g_object_notify (G_OBJECT (viewport), "vadjustment");
}
static void
gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
if (viewport->hadjustment != hadjustment)
gtk_viewport_set_hadjustment (viewport, hadjustment);
if (viewport->vadjustment != vadjustment)
gtk_viewport_set_vadjustment (viewport, vadjustment);
}
/**
* gtk_viewport_set_shadow_type:
* @viewport: a #GtkViewport.
* @type: the new shadow type.
*
* Sets the shadow type of the viewport.
**/
void
gtk_viewport_set_shadow_type (GtkViewport *viewport,
GtkShadowType type)
{
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
if ((GtkShadowType) viewport->shadow_type != type)
{
viewport->shadow_type = type;
if (GTK_WIDGET_VISIBLE (viewport))
{
gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
gtk_widget_queue_draw (GTK_WIDGET (viewport));
}
g_object_notify (G_OBJECT (viewport), "shadow_type");
}
}
/**
* gtk_viewport_get_shadow_type:
* @viewport: a #GtkViewport
*
* Gets the shadow type of the #GtkViewport. See
* gtk_viewport_set_shadow_type().
* Return value: the shadow type
**/
GtkShadowType
gtk_viewport_get_shadow_type (GtkViewport *viewport)
{
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
return viewport->shadow_type;
}
static void
gtk_viewport_realize (GtkWidget *widget)
{
GtkBin *bin;
GtkViewport *viewport;
GdkWindowAttr attributes;
gint attributes_mask;
gint event_mask;
gint border_width;
border_width = GTK_CONTAINER (widget)->border_width;
bin = GTK_BIN (widget);
viewport = GTK_VIEWPORT (widget);
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
attributes.x = widget->allocation.x + border_width;
attributes.y = widget->allocation.y + border_width;
attributes.width = widget->allocation.width - border_width * 2;
attributes.height = widget->allocation.height - border_width * 2;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
/* We select on button_press_mask so that button 4-5 scrolls are trapped.
*/
attributes.event_mask = event_mask | GDK_BUTTON_PRESS_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, viewport);
if (viewport->shadow_type != GTK_SHADOW_NONE)
{
attributes.x = widget->style->xthickness;
attributes.y = widget->style->ythickness;
}
else
{
attributes.x = 0;
attributes.y = 0;
}
attributes.width = MAX (1, (gint)widget->allocation.width - attributes.x * 2 - border_width * 2);
attributes.height = MAX (1, (gint)widget->allocation.height - attributes.y * 2 - border_width * 2);
attributes.event_mask = 0;
viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
gdk_window_set_user_data (viewport->view_window, viewport);
attributes.x = 0;
attributes.y = 0;
if (bin->child)
{
attributes.width = viewport->hadjustment->upper;
attributes.height = viewport->vadjustment->upper;
}
attributes.event_mask = event_mask;
viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
gdk_window_set_user_data (viewport->bin_window, viewport);
if (bin->child)
gtk_widget_set_parent_window (bin->child, viewport->bin_window);
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, viewport->bin_window, GTK_STATE_NORMAL);
gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
GTK_SHADOW_NONE,
NULL, widget, "viewportbin",
0, 0, -1, -1);
gdk_window_show (viewport->bin_window);
gdk_window_show (viewport->view_window);
}
static void
gtk_viewport_unrealize (GtkWidget *widget)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
gdk_window_set_user_data (viewport->view_window, NULL);
gdk_window_destroy (viewport->view_window);
viewport->view_window = NULL;
gdk_window_set_user_data (viewport->bin_window, NULL);
gdk_window_destroy (viewport->bin_window);
viewport->bin_window = NULL;
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
static void
gtk_viewport_paint (GtkWidget *widget,
GdkRectangle *area)
{
GtkViewport *viewport;
g_return_if_fail (GTK_IS_VIEWPORT (widget));
g_return_if_fail (area != NULL);
if (GTK_WIDGET_DRAWABLE (widget))
{
viewport = GTK_VIEWPORT (widget);
gtk_draw_shadow (widget->style, widget->window,
GTK_STATE_NORMAL, viewport->shadow_type,
0, 0, -1, -1);
}
}
static gint
gtk_viewport_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkViewport *viewport;
GtkBin *bin;
if (GTK_WIDGET_DRAWABLE (widget))
{
viewport = GTK_VIEWPORT (widget);
bin = GTK_BIN (widget);
if (event->window == widget->window)
gtk_viewport_paint (widget, &event->area);
else if (event->window == viewport->bin_window)
{
gtk_paint_flat_box(widget->style, viewport->bin_window,
GTK_STATE_NORMAL, GTK_SHADOW_NONE,
&event->area, widget, "viewportbin",
0, 0, -1, -1);
(* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
}
}
return FALSE;
}
static void
gtk_viewport_add (GtkContainer *container,
GtkWidget *child)
{
GtkBin *bin;
g_return_if_fail (GTK_IS_WIDGET (child));
bin = GTK_BIN (container);
g_return_if_fail (bin->child == NULL);
gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
GTK_CONTAINER_CLASS (parent_class)->add (container, child);
}
static void
gtk_viewport_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkViewport *viewport;
GtkBin *bin;
GtkRequisition child_requisition;
viewport = GTK_VIEWPORT (widget);
bin = GTK_BIN (widget);
requisition->width = (GTK_CONTAINER (widget)->border_width +
GTK_WIDGET (widget)->style->xthickness) * 2;
requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
GTK_WIDGET (widget)->style->ythickness) * 2;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
gtk_widget_size_request (bin->child, &child_requisition);
requisition->width += child_requisition.width;
requisition->height += child_requisition.height;
}
}
static void
gtk_viewport_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkBin *bin = GTK_BIN (widget);
GtkAllocation child_allocation;
gint hval, vval;
gint border_width = GTK_CONTAINER (widget)->border_width;
/* demand creation */
if (!viewport->hadjustment)
gtk_viewport_set_hadjustment (viewport, NULL);
if (!viewport->vadjustment)
gtk_viewport_set_vadjustment (viewport, NULL);
/* If our size changed, and we have a shadow, queue a redraw on widget->window to
* redraw the shadow correctly.
*/
if (GTK_WIDGET_MAPPED (widget) &&
viewport->shadow_type != GTK_SHADOW_NONE &&
(widget->allocation.width != allocation->width ||
widget->allocation.height != allocation->height))
gdk_window_invalidate_rect (widget->window, NULL, FALSE);
widget->allocation = *allocation;
child_allocation.x = 0;
child_allocation.y = 0;
if (viewport->shadow_type != GTK_SHADOW_NONE)
{
child_allocation.x = widget->style->xthickness;
child_allocation.y = widget->style->ythickness;
}
child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_move_resize (widget->window,
allocation->x + border_width,
allocation->y + border_width,
allocation->width - border_width * 2,
allocation->height - border_width * 2);
gdk_window_move_resize (viewport->view_window,
child_allocation.x,
child_allocation.y,
child_allocation.width,
child_allocation.height);
}
viewport->hadjustment->page_size = child_allocation.width;
viewport->hadjustment->step_increment = child_allocation.width * 0.1;
viewport->hadjustment->page_increment = child_allocation.width * 0.9;
viewport->vadjustment->page_size = child_allocation.height;
viewport->vadjustment->step_increment = child_allocation.height * 0.1;
viewport->vadjustment->page_increment = child_allocation.height * 0.9;
hval = viewport->hadjustment->value;
vval = viewport->vadjustment->value;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
GtkRequisition child_requisition;
gtk_widget_get_child_requisition (bin->child, &child_requisition);
viewport->hadjustment->lower = 0;
viewport->hadjustment->upper = MAX (child_requisition.width,
child_allocation.width);
hval = CLAMP (hval, 0,
viewport->hadjustment->upper -
viewport->hadjustment->page_size);
viewport->vadjustment->lower = 0;
viewport->vadjustment->upper = MAX (child_requisition.height,
child_allocation.height);
vval = CLAMP (vval, 0,
viewport->vadjustment->upper -
viewport->vadjustment->page_size);
}
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
child_allocation.x = 0;
child_allocation.y = 0;
child_allocation.width = viewport->hadjustment->upper;
child_allocation.height = viewport->vadjustment->upper;
if (GTK_WIDGET_REALIZED (widget))
gdk_window_resize (viewport->bin_window,
child_allocation.width,
child_allocation.height);
child_allocation.x = 0;
child_allocation.y = 0;
gtk_widget_size_allocate (bin->child, &child_allocation);
}
gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
if (viewport->hadjustment->value != hval)
{
viewport->hadjustment->value = hval;
gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
}
if (viewport->vadjustment->value != vval)
{
viewport->vadjustment->value = vval;
gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
}
}
static void
gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkViewport *viewport;
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
g_return_if_fail (GTK_IS_VIEWPORT (data));
viewport = GTK_VIEWPORT (data);
}
static void
gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkViewport *viewport;
GtkBin *bin;
GtkAllocation child_allocation;
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
g_return_if_fail (GTK_IS_VIEWPORT (data));
viewport = GTK_VIEWPORT (data);
bin = GTK_BIN (data);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
child_allocation.x = 0;
child_allocation.y = 0;
if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
viewport->hadjustment->page_size))
child_allocation.x = viewport->hadjustment->lower - viewport->hadjustment->value;
if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
viewport->vadjustment->page_size))
child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
if (GTK_WIDGET_REALIZED (viewport))
{
gdk_window_move (viewport->bin_window,
child_allocation.x,
child_allocation.y);
gdk_window_process_updates (viewport->bin_window, TRUE);
}
}
}
static void
gtk_viewport_style_set (GtkWidget *widget,
GtkStyle *previous_style)
{
GtkViewport *viewport;
if (GTK_WIDGET_REALIZED (widget) &&
!GTK_WIDGET_NO_WINDOW (widget))
{
viewport = GTK_VIEWPORT (widget);
gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
gtk_style_set_background (widget->style, widget->window, widget->state);
}
}
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