1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
27 #include "gtksignal.h"
28 #include "gtkviewport.h"
30 #include "gtkmarshalers.h"
40 static void gtk_viewport_class_init (GtkViewportClass *klass);
41 static void gtk_viewport_init (GtkViewport *viewport);
42 static void gtk_viewport_destroy (GtkObject *object);
43 static void gtk_viewport_set_property (GObject *object,
47 static void gtk_viewport_get_property (GObject *object,
51 static void gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
52 GtkAdjustment *hadjustment,
53 GtkAdjustment *vadjustment);
54 static void gtk_viewport_realize (GtkWidget *widget);
55 static void gtk_viewport_unrealize (GtkWidget *widget);
56 static void gtk_viewport_paint (GtkWidget *widget,
58 static gint gtk_viewport_expose (GtkWidget *widget,
59 GdkEventExpose *event);
60 static void gtk_viewport_add (GtkContainer *container,
62 static void gtk_viewport_size_request (GtkWidget *widget,
63 GtkRequisition *requisition);
64 static void gtk_viewport_size_allocate (GtkWidget *widget,
65 GtkAllocation *allocation);
66 static void gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
68 static void gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
70 static void gtk_viewport_style_set (GtkWidget *widget,
71 GtkStyle *previous_style);
73 static GtkBinClass *parent_class;
76 gtk_viewport_get_type (void)
78 static GtkType viewport_type = 0;
82 static const GtkTypeInfo viewport_info =
86 sizeof (GtkViewportClass),
87 (GtkClassInitFunc) gtk_viewport_class_init,
88 (GtkObjectInitFunc) gtk_viewport_init,
89 /* reserved_1 */ NULL,
90 /* reserved_2 */ NULL,
91 (GtkClassInitFunc) NULL,
94 viewport_type = gtk_type_unique (GTK_TYPE_BIN, &viewport_info);
101 gtk_viewport_class_init (GtkViewportClass *class)
103 GtkObjectClass *object_class;
104 GObjectClass *gobject_class;
105 GtkWidgetClass *widget_class;
106 GtkContainerClass *container_class;
108 object_class = (GtkObjectClass*) class;
109 gobject_class = G_OBJECT_CLASS (class);
110 widget_class = (GtkWidgetClass*) class;
111 container_class = (GtkContainerClass*) class;
112 parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);
114 gobject_class->set_property = gtk_viewport_set_property;
115 gobject_class->get_property = gtk_viewport_get_property;
116 object_class->destroy = gtk_viewport_destroy;
118 widget_class->realize = gtk_viewport_realize;
119 widget_class->unrealize = gtk_viewport_unrealize;
120 widget_class->expose_event = gtk_viewport_expose;
121 widget_class->size_request = gtk_viewport_size_request;
122 widget_class->size_allocate = gtk_viewport_size_allocate;
123 widget_class->style_set = gtk_viewport_style_set;
125 container_class->add = gtk_viewport_add;
127 class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
129 g_object_class_install_property (gobject_class,
131 g_param_spec_object ("hadjustment",
132 _("Horizontal adjustment"),
133 _("The GtkAdjustment that determines the values of the horizontal position for this viewport."),
137 g_object_class_install_property (gobject_class,
139 g_param_spec_object ("vadjustment",
140 _("Vertical adjustment"),
141 _("The GtkAdjustment that determines the values of the vertical position for this viewport."),
145 g_object_class_install_property (gobject_class,
147 g_param_spec_enum ("shadow_type",
149 _("Determines how the shadowed box around the viewport is drawn."),
150 GTK_TYPE_SHADOW_TYPE,
154 widget_class->set_scroll_adjustments_signal =
155 gtk_signal_new ("set_scroll_adjustments",
157 GTK_CLASS_TYPE (object_class),
158 GTK_SIGNAL_OFFSET (GtkViewportClass, set_scroll_adjustments),
159 _gtk_marshal_VOID__OBJECT_OBJECT,
160 GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
164 gtk_viewport_set_property (GObject *object,
169 GtkViewport *viewport;
171 viewport = GTK_VIEWPORT (object);
175 case PROP_HADJUSTMENT:
176 gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
178 case PROP_VADJUSTMENT:
179 gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
181 case PROP_SHADOW_TYPE:
182 gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
185 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
191 gtk_viewport_get_property (GObject *object,
196 GtkViewport *viewport;
198 viewport = GTK_VIEWPORT (object);
202 case PROP_HADJUSTMENT:
203 g_value_set_object (value, viewport->hadjustment);
205 case PROP_VADJUSTMENT:
206 g_value_set_object (value, viewport->vadjustment);
208 case PROP_SHADOW_TYPE:
209 g_value_set_enum (value, viewport->shadow_type);
212 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
218 gtk_viewport_init (GtkViewport *viewport)
220 GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
222 gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
223 gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
225 viewport->shadow_type = GTK_SHADOW_IN;
226 viewport->view_window = NULL;
227 viewport->bin_window = NULL;
228 viewport->hadjustment = NULL;
229 viewport->vadjustment = NULL;
234 * @hadjustment: horizontal adjustment.
235 * @vadjustment: vertical adjustment.
236 * @returns: a new #GtkViewport.
238 * Creates a new #GtkViewport with the given adjustments.
242 gtk_viewport_new (GtkAdjustment *hadjustment,
243 GtkAdjustment *vadjustment)
247 viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
248 "hadjustment", hadjustment,
249 "vadjustment", vadjustment,
256 gtk_viewport_destroy (GtkObject *object)
258 GtkViewport *viewport = GTK_VIEWPORT (object);
260 if (viewport->hadjustment)
262 gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
263 gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
264 viewport->hadjustment = NULL;
266 if (viewport->vadjustment)
268 gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
269 gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
270 viewport->vadjustment = NULL;
273 GTK_OBJECT_CLASS (parent_class)->destroy (object);
277 * gtk_viewport_get_hadjustment:
278 * @viewport: a #GtkViewport.
280 * Returns the horizontal adjustment of the viewport.
282 * Return value: the horizontal adjustment of @viewport.
285 gtk_viewport_get_hadjustment (GtkViewport *viewport)
287 g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
289 if (!viewport->hadjustment)
290 gtk_viewport_set_hadjustment (viewport, NULL);
292 return viewport->hadjustment;
296 * gtk_viewport_get_vadjustment:
297 * @viewport: a #GtkViewport.
299 * Returns the vertical adjustment of the viewport.
301 * Return value: the vertical adjustment of @viewport.
304 gtk_viewport_get_vadjustment (GtkViewport *viewport)
306 g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
308 if (!viewport->vadjustment)
309 gtk_viewport_set_vadjustment (viewport, NULL);
311 return viewport->vadjustment;
315 * gtk_viewport_set_hadjustment:
316 * @viewport: a #GtkViewport.
317 * @adjustment: a #GtkAdjustment.
319 * Sets the horizontal adjustment of the viewport.
322 gtk_viewport_set_hadjustment (GtkViewport *viewport,
323 GtkAdjustment *adjustment)
325 g_return_if_fail (GTK_IS_VIEWPORT (viewport));
327 g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
329 if (viewport->hadjustment && viewport->hadjustment != adjustment)
331 gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment), viewport);
332 gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
333 viewport->hadjustment = NULL;
337 adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
340 if (viewport->hadjustment != adjustment)
342 viewport->hadjustment = adjustment;
343 gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
344 gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
346 gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
347 (GtkSignalFunc) gtk_viewport_adjustment_changed,
348 (gpointer) viewport);
349 gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
350 (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
351 (gpointer) viewport);
353 gtk_viewport_adjustment_changed (adjustment, viewport);
356 g_object_notify (G_OBJECT (viewport), "hadjustment");
360 * gtk_viewport_set_vadjustment:
361 * @viewport: a #GtkViewport.
362 * @adjustment: a #GtkAdjustment.
364 * Sets the vertical adjustment of the viewport.
367 gtk_viewport_set_vadjustment (GtkViewport *viewport,
368 GtkAdjustment *adjustment)
370 g_return_if_fail (GTK_IS_VIEWPORT (viewport));
372 g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
374 if (viewport->vadjustment && viewport->vadjustment != adjustment)
376 gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment), viewport);
377 gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
378 viewport->vadjustment = NULL;
382 adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
385 if (viewport->vadjustment != adjustment)
387 viewport->vadjustment = adjustment;
388 gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
389 gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
391 gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
392 (GtkSignalFunc) gtk_viewport_adjustment_changed,
393 (gpointer) viewport);
394 gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
395 (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
396 (gpointer) viewport);
398 gtk_viewport_adjustment_changed (adjustment, viewport);
401 g_object_notify (G_OBJECT (viewport), "vadjustment");
405 gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
406 GtkAdjustment *hadjustment,
407 GtkAdjustment *vadjustment)
409 if (viewport->hadjustment != hadjustment)
410 gtk_viewport_set_hadjustment (viewport, hadjustment);
411 if (viewport->vadjustment != vadjustment)
412 gtk_viewport_set_vadjustment (viewport, vadjustment);
416 * gtk_viewport_set_shadow_type:
417 * @viewport: a #GtkViewport.
418 * @type: the new shadow type.
420 * Sets the shadow type of the viewport.
423 gtk_viewport_set_shadow_type (GtkViewport *viewport,
426 g_return_if_fail (GTK_IS_VIEWPORT (viewport));
428 if ((GtkShadowType) viewport->shadow_type != type)
430 viewport->shadow_type = type;
432 if (GTK_WIDGET_VISIBLE (viewport))
434 gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
435 gtk_widget_queue_draw (GTK_WIDGET (viewport));
438 g_object_notify (G_OBJECT (viewport), "shadow_type");
443 * gtk_viewport_get_shadow_type:
444 * @viewport: a #GtkViewport
446 * Gets the shadow type of the #GtkViewport. See
447 * gtk_viewport_set_shadow_type().
449 * Return value: the shadow type
452 gtk_viewport_get_shadow_type (GtkViewport *viewport)
454 g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
456 return viewport->shadow_type;
460 gtk_viewport_realize (GtkWidget *widget)
463 GtkViewport *viewport;
464 GdkWindowAttr attributes;
465 gint attributes_mask;
469 g_return_if_fail (GTK_IS_VIEWPORT (widget));
471 border_width = GTK_CONTAINER (widget)->border_width;
473 bin = GTK_BIN (widget);
474 viewport = GTK_VIEWPORT (widget);
475 GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
477 attributes.x = widget->allocation.x + border_width;
478 attributes.y = widget->allocation.y + border_width;
479 attributes.width = widget->allocation.width - border_width * 2;
480 attributes.height = widget->allocation.height - border_width * 2;
481 attributes.window_type = GDK_WINDOW_CHILD;
482 attributes.wclass = GDK_INPUT_OUTPUT;
483 attributes.visual = gtk_widget_get_visual (widget);
484 attributes.colormap = gtk_widget_get_colormap (widget);
486 event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
487 /* We select on button_press_mask so that button 4-5 scrolls are trapped.
489 attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
491 attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
493 widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
494 &attributes, attributes_mask);
495 gdk_window_set_user_data (widget->window, viewport);
497 if (viewport->shadow_type != GTK_SHADOW_NONE)
499 attributes.x = widget->style->xthickness;
500 attributes.y = widget->style->ythickness;
508 attributes.width = MAX (1, (gint)widget->allocation.width - attributes.x * 2 - border_width * 2);
509 attributes.height = MAX (1, (gint)widget->allocation.height - attributes.y * 2 - border_width * 2);
510 attributes.event_mask = 0;
512 viewport->view_window = gdk_window_new (widget->window, &attributes, attributes_mask);
513 gdk_window_set_user_data (viewport->view_window, viewport);
520 attributes.width = viewport->hadjustment->upper;
521 attributes.height = viewport->vadjustment->upper;
524 attributes.event_mask = event_mask;
526 viewport->bin_window = gdk_window_new (viewport->view_window, &attributes, attributes_mask);
527 gdk_window_set_user_data (viewport->bin_window, viewport);
530 gtk_widget_set_parent_window (bin->child, viewport->bin_window);
532 widget->style = gtk_style_attach (widget->style, widget->window);
533 gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
534 gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
536 gtk_paint_flat_box(widget->style, viewport->bin_window, GTK_STATE_NORMAL,
538 NULL, widget, "viewportbin",
541 gdk_window_show (viewport->bin_window);
542 gdk_window_show (viewport->view_window);
546 gtk_viewport_unrealize (GtkWidget *widget)
548 GtkViewport *viewport;
550 g_return_if_fail (GTK_IS_VIEWPORT (widget));
552 viewport = GTK_VIEWPORT (widget);
554 gdk_window_set_user_data (viewport->view_window, NULL);
555 gdk_window_destroy (viewport->view_window);
556 viewport->view_window = NULL;
558 gdk_window_set_user_data (viewport->bin_window, NULL);
559 gdk_window_destroy (viewport->bin_window);
560 viewport->bin_window = NULL;
562 if (GTK_WIDGET_CLASS (parent_class)->unrealize)
563 (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
567 gtk_viewport_paint (GtkWidget *widget,
570 GtkViewport *viewport;
572 g_return_if_fail (GTK_IS_VIEWPORT (widget));
573 g_return_if_fail (area != NULL);
575 if (GTK_WIDGET_DRAWABLE (widget))
577 viewport = GTK_VIEWPORT (widget);
579 gtk_draw_shadow (widget->style, widget->window,
580 GTK_STATE_NORMAL, viewport->shadow_type,
586 gtk_viewport_expose (GtkWidget *widget,
587 GdkEventExpose *event)
589 GtkViewport *viewport;
591 GdkEventExpose child_event;
593 g_return_val_if_fail (GTK_IS_VIEWPORT (widget), FALSE);
594 g_return_val_if_fail (event != NULL, FALSE);
596 if (GTK_WIDGET_DRAWABLE (widget))
598 viewport = GTK_VIEWPORT (widget);
599 bin = GTK_BIN (widget);
601 if (event->window == widget->window)
602 gtk_viewport_paint (widget, &event->area);
603 else if (event->window == viewport->bin_window)
605 child_event = *event;
607 gtk_paint_flat_box(widget->style, viewport->bin_window,
608 GTK_STATE_NORMAL, GTK_SHADOW_NONE,
609 &event->area, widget, "viewportbin",
612 (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
622 gtk_viewport_add (GtkContainer *container,
627 g_return_if_fail (GTK_IS_VIEWPORT (container));
628 g_return_if_fail (child != NULL);
630 bin = GTK_BIN (container);
631 g_return_if_fail (bin->child == NULL);
633 gtk_widget_set_parent_window (child, GTK_VIEWPORT (bin)->bin_window);
635 GTK_CONTAINER_CLASS (parent_class)->add (container, child);
639 gtk_viewport_size_request (GtkWidget *widget,
640 GtkRequisition *requisition)
642 GtkViewport *viewport;
644 GtkRequisition child_requisition;
646 g_return_if_fail (GTK_IS_VIEWPORT (widget));
647 g_return_if_fail (requisition != NULL);
649 viewport = GTK_VIEWPORT (widget);
650 bin = GTK_BIN (widget);
652 requisition->width = (GTK_CONTAINER (widget)->border_width +
653 GTK_WIDGET (widget)->style->xthickness) * 2;
655 requisition->height = (GTK_CONTAINER (widget)->border_width * 2 +
656 GTK_WIDGET (widget)->style->ythickness) * 2;
658 if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
660 gtk_widget_size_request (bin->child, &child_requisition);
661 requisition->width += child_requisition.width;
662 requisition->height += child_requisition.height;
667 gtk_viewport_size_allocate (GtkWidget *widget,
668 GtkAllocation *allocation)
670 GtkViewport *viewport = GTK_VIEWPORT (widget);
671 GtkBin *bin = GTK_BIN (widget);
672 GtkAllocation child_allocation;
674 gint border_width = GTK_CONTAINER (widget)->border_width;
676 /* demand creation */
677 if (!viewport->hadjustment)
678 gtk_viewport_set_hadjustment (viewport, NULL);
679 if (!viewport->vadjustment)
680 gtk_viewport_set_vadjustment (viewport, NULL);
682 /* If our size changed, and we have a shadow, queue a redraw on widget->window to
683 * redraw the shadow correctly.
685 if (GTK_WIDGET_MAPPED (widget) &&
686 viewport->shadow_type != GTK_SHADOW_NONE &&
687 (widget->allocation.width != allocation->width ||
688 widget->allocation.height != allocation->height))
689 gdk_window_invalidate_rect (widget->window, NULL, FALSE);
691 widget->allocation = *allocation;
693 child_allocation.x = 0;
694 child_allocation.y = 0;
696 if (viewport->shadow_type != GTK_SHADOW_NONE)
698 child_allocation.x = widget->style->xthickness;
699 child_allocation.y = widget->style->ythickness;
702 child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2 - border_width * 2);
703 child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2 - border_width * 2);
705 if (GTK_WIDGET_REALIZED (widget))
707 gdk_window_move_resize (widget->window,
708 allocation->x + border_width,
709 allocation->y + border_width,
710 allocation->width - border_width * 2,
711 allocation->height - border_width * 2);
713 gdk_window_move_resize (viewport->view_window,
716 child_allocation.width,
717 child_allocation.height);
720 viewport->hadjustment->page_size = child_allocation.width;
721 viewport->hadjustment->page_increment = viewport->hadjustment->page_size / 2;
722 viewport->hadjustment->step_increment = 10;
724 viewport->vadjustment->page_size = child_allocation.height;
725 viewport->vadjustment->page_increment = viewport->vadjustment->page_size / 2;
726 viewport->vadjustment->step_increment = 10;
728 hval = viewport->hadjustment->value;
729 vval = viewport->vadjustment->value;
731 if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
733 GtkRequisition child_requisition;
734 gtk_widget_get_child_requisition (bin->child, &child_requisition);
736 viewport->hadjustment->lower = 0;
737 viewport->hadjustment->upper = MAX (child_requisition.width,
738 child_allocation.width);
740 hval = CLAMP (hval, 0,
741 viewport->hadjustment->upper -
742 viewport->hadjustment->page_size);
744 viewport->vadjustment->lower = 0;
745 viewport->vadjustment->upper = MAX (child_requisition.height,
746 child_allocation.height);
748 vval = CLAMP (vval, 0,
749 viewport->vadjustment->upper -
750 viewport->vadjustment->page_size);
753 if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
755 child_allocation.x = 0;
756 child_allocation.y = 0;
758 child_allocation.width = viewport->hadjustment->upper;
759 child_allocation.height = viewport->vadjustment->upper;
761 if (GTK_WIDGET_REALIZED (widget))
762 gdk_window_resize (viewport->bin_window,
763 child_allocation.width,
764 child_allocation.height);
766 child_allocation.x = 0;
767 child_allocation.y = 0;
768 gtk_widget_size_allocate (bin->child, &child_allocation);
771 gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "changed");
772 gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "changed");
773 if (viewport->hadjustment->value != hval)
775 viewport->hadjustment->value = hval;
776 gtk_signal_emit_by_name (GTK_OBJECT (viewport->hadjustment), "value_changed");
778 if (viewport->vadjustment->value != vval)
780 viewport->vadjustment->value = vval;
781 gtk_signal_emit_by_name (GTK_OBJECT (viewport->vadjustment), "value_changed");
786 gtk_viewport_adjustment_changed (GtkAdjustment *adjustment,
789 GtkViewport *viewport;
791 g_return_if_fail (adjustment != NULL);
792 g_return_if_fail (GTK_IS_VIEWPORT (data));
794 viewport = GTK_VIEWPORT (data);
798 gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
801 GtkViewport *viewport;
803 GtkAllocation child_allocation;
805 g_return_if_fail (adjustment != NULL);
806 g_return_if_fail (GTK_IS_VIEWPORT (data));
808 viewport = GTK_VIEWPORT (data);
809 bin = GTK_BIN (data);
811 if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
813 child_allocation.x = 0;
814 child_allocation.y = 0;
816 if (viewport->hadjustment->lower != (viewport->hadjustment->upper -
817 viewport->hadjustment->page_size))
818 child_allocation.x = viewport->hadjustment->lower - viewport->hadjustment->value;
820 if (viewport->vadjustment->lower != (viewport->vadjustment->upper -
821 viewport->vadjustment->page_size))
822 child_allocation.y = viewport->vadjustment->lower - viewport->vadjustment->value;
824 if (GTK_WIDGET_REALIZED (viewport))
826 gdk_window_move (viewport->bin_window,
830 gdk_window_process_updates (viewport->bin_window, TRUE);
836 gtk_viewport_style_set (GtkWidget *widget,
837 GtkStyle *previous_style)
839 GtkViewport *viewport;
841 if (GTK_WIDGET_REALIZED (widget) &&
842 !GTK_WIDGET_NO_WINDOW (widget))
844 viewport = GTK_VIEWPORT (widget);
846 gtk_style_set_background (widget->style, viewport->bin_window, GTK_STATE_NORMAL);
847 gtk_style_set_background (widget->style, widget->window, widget->state);