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gtk2/gtk/gtkviewport.c
CST 1999 Shawn T. Amundson 279e878bdd Added notice to look in AUTHORS and ChangeLog files for a list of changes. 
Wed Feb 24 01:22:39 CST 1999 Shawn T. Amundson <amundson@gtk.org>

        * *.[ch]: Added notice to look in AUTHORS and ChangeLog files
	  for a list of changes.
1999-02-24 07:37:18 +00:00

851 lines
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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.
*/
/*
* 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 "gtksignal.h"
#include "gtkviewport.h"
enum {
ARG_0,
ARG_HADJUSTMENT,
ARG_VADJUSTMENT,
ARG_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_finalize (GtkObject *object);
static void gtk_viewport_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_viewport_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment);
static void gtk_viewport_map (GtkWidget *widget);
static void gtk_viewport_unmap (GtkWidget *widget);
static void gtk_viewport_realize (GtkWidget *widget);
static void gtk_viewport_unrealize (GtkWidget *widget);
static void gtk_viewport_paint (GtkWidget *widget,
GdkRectangle *area);
static void gtk_viewport_draw (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;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
gtk_object_add_arg_type ("GtkViewport::hadjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_HADJUSTMENT);
gtk_object_add_arg_type ("GtkViewport::vadjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_VADJUSTMENT);
gtk_object_add_arg_type ("GtkViewport::shadow_type",
GTK_TYPE_SHADOW_TYPE,
GTK_ARG_READWRITE,
ARG_SHADOW_TYPE);
object_class->set_arg = gtk_viewport_set_arg;
object_class->get_arg = gtk_viewport_get_arg;
object_class->destroy = gtk_viewport_destroy;
object_class->finalize = gtk_viewport_finalize;
widget_class->map = gtk_viewport_map;
widget_class->unmap = gtk_viewport_unmap;
widget_class->realize = gtk_viewport_realize;
widget_class->unrealize = gtk_viewport_unrealize;
widget_class->draw = gtk_viewport_draw;
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;
widget_class->set_scroll_adjustments_signal =
gtk_signal_new ("set_scroll_adjustments",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (GtkViewportClass, set_scroll_adjustments),
gtk_marshal_NONE__POINTER_POINTER,
GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
container_class->add = gtk_viewport_add;
class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
}
static void
gtk_viewport_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkViewport *viewport;
viewport = GTK_VIEWPORT (object);
switch (arg_id)
{
case ARG_HADJUSTMENT:
gtk_viewport_set_hadjustment (viewport, GTK_VALUE_POINTER (*arg));
break;
case ARG_VADJUSTMENT:
gtk_viewport_set_vadjustment (viewport, GTK_VALUE_POINTER (*arg));
break;
case ARG_SHADOW_TYPE:
gtk_viewport_set_shadow_type (viewport, GTK_VALUE_ENUM (*arg));
break;
default:
break;
}
}
static void
gtk_viewport_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkViewport *viewport;
viewport = GTK_VIEWPORT (object);
switch (arg_id)
{
case ARG_HADJUSTMENT:
GTK_VALUE_POINTER (*arg) = viewport->hadjustment;
break;
case ARG_VADJUSTMENT:
GTK_VALUE_POINTER (*arg) = viewport->vadjustment;
break;
case ARG_SHADOW_TYPE:
GTK_VALUE_ENUM (*arg) = viewport->shadow_type;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static void
gtk_viewport_init (GtkViewport *viewport)
{
GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
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;
}
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);
if (viewport->vadjustment)
gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment),
viewport);
GTK_OBJECT_CLASS(parent_class)->destroy (object);
}
static void
gtk_viewport_finalize (GtkObject *object)
{
GtkViewport *viewport = GTK_VIEWPORT (object);
gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
GTK_OBJECT_CLASS(parent_class)->finalize (object);
}
GtkAdjustment*
gtk_viewport_get_hadjustment (GtkViewport *viewport)
{
g_return_val_if_fail (viewport != NULL, NULL);
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
return viewport->hadjustment;
}
GtkAdjustment*
gtk_viewport_get_vadjustment (GtkViewport *viewport)
{
g_return_val_if_fail (viewport != NULL, NULL);
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
return viewport->vadjustment;
}
void
gtk_viewport_set_hadjustment (GtkViewport *viewport,
GtkAdjustment *adjustment)
{
g_return_if_fail (viewport != NULL);
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),
(gpointer) viewport);
gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
}
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);
}
}
void
gtk_viewport_set_vadjustment (GtkViewport *viewport,
GtkAdjustment *adjustment)
{
g_return_if_fail (viewport != NULL);
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),
(gpointer) viewport);
gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
}
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);
}
}
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);
}
void
gtk_viewport_set_shadow_type (GtkViewport *viewport,
GtkShadowType type)
{
g_return_if_fail (viewport != NULL);
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));
}
}
}
static void
gtk_viewport_map (GtkWidget *widget)
{
GtkBin *bin;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
bin = GTK_BIN (widget);
if (bin->child &&
GTK_WIDGET_VISIBLE (bin->child) &&
!GTK_WIDGET_MAPPED (bin->child))
gtk_widget_map (bin->child);
gdk_window_show (widget->window);
}
static void
gtk_viewport_unmap (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
gdk_window_hide (widget->window);
}
static void
gtk_viewport_realize (GtkWidget *widget)
{
GtkBin *bin;
GtkViewport *viewport;
GdkWindowAttr attributes;
gint attributes_mask;
gint event_mask;
gint border_width;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
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->klass->xthickness;
attributes.y = widget->style->klass->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;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
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 (widget != NULL);
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 void
gtk_viewport_draw (GtkWidget *widget,
GdkRectangle *area)
{
GtkViewport *viewport;
GtkBin *bin;
GdkRectangle tmp_area;
GdkRectangle child_area;
gint border_width;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
g_return_if_fail (area != NULL);
if (GTK_WIDGET_DRAWABLE (widget))
{
viewport = GTK_VIEWPORT (widget);
bin = GTK_BIN (widget);
border_width = GTK_CONTAINER (widget)->border_width;
tmp_area = *area;
tmp_area.x -= border_width;
tmp_area.y -= border_width;
gtk_viewport_paint (widget, &tmp_area);
tmp_area.x += viewport->hadjustment->value - widget->style->klass->xthickness;
tmp_area.y += viewport->vadjustment->value - widget->style->klass->ythickness;
gtk_paint_flat_box(widget->style, viewport->bin_window,
GTK_STATE_NORMAL, GTK_SHADOW_NONE,
&tmp_area, widget, "viewportbin",
0, 0, -1, -1);
if (bin->child)
{
if (gtk_widget_intersect (bin->child, &tmp_area, &child_area))
gtk_widget_draw (bin->child, &child_area);
}
}
}
static gint
gtk_viewport_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkViewport *viewport;
GtkBin *bin;
GdkEventExpose child_event;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
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)
{
child_event = *event;
gtk_paint_flat_box(widget->style, viewport->bin_window,
GTK_STATE_NORMAL, GTK_SHADOW_NONE,
&event->area, widget, "viewportbin",
0, 0, -1, -1);
if ((bin->child != NULL) &&
GTK_WIDGET_NO_WINDOW (bin->child) &&
gtk_widget_intersect (bin->child, &event->area, &child_event.area))
gtk_widget_event (bin->child, (GdkEvent*) &child_event);
}
}
return FALSE;
}
static void
gtk_viewport_add (GtkContainer *container,
GtkWidget *child)
{
GtkBin *bin;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (container));
g_return_if_fail (child != NULL);
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;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
g_return_if_fail (requisition != NULL);
viewport = GTK_VIEWPORT (widget);
bin = GTK_BIN (widget);
requisition->width = (GTK_CONTAINER (widget)->border_width +
GTK_WIDGET (widget)->style->klass->xthickness) * 2 + 5;
requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
GTK_WIDGET (widget)->style->klass->ythickness) * 2 + 5;
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;
GtkBin *bin;
GtkAllocation child_allocation;
gint hval, vval;
gint border_width;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (widget));
g_return_if_fail (allocation != NULL);
widget->allocation = *allocation;
viewport = GTK_VIEWPORT (widget);
bin = GTK_BIN (widget);
border_width = GTK_CONTAINER (widget)->border_width;
child_allocation.x = 0;
child_allocation.y = 0;
if (viewport->shadow_type != GTK_SHADOW_NONE)
{
child_allocation.x = GTK_WIDGET (viewport)->style->klass->xthickness;
child_allocation.y = GTK_WIDGET (viewport)->style->klass->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->page_increment = viewport->hadjustment->page_size / 2;
viewport->hadjustment->step_increment = 10;
viewport->vadjustment->page_size = child_allocation.height;
viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
viewport->vadjustment->step_increment = 10;
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))
gtk_widget_realize (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 (adjustment != NULL);
g_return_if_fail (data != NULL);
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;
gint width, height;
g_return_if_fail (adjustment != NULL);
g_return_if_fail (data != NULL);
g_return_if_fail (GTK_IS_VIEWPORT (data));
viewport = GTK_VIEWPORT (data);
bin = GTK_BIN (data);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
gdk_window_get_size (viewport->view_window, &width, &height);
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);
}
}
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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