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gtk2/gtk/gtkscrolledwindow.c
Owen Taylor 10ba4fd066 Merges from gtk-1-2
2000-03-14 19:57:25 +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.
*/
/*
* 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 "gtkscrolledwindow.h"
#include "gtksignal.h"
/* scrolled window policy and size requisition handling:
*
* gtk size requisition works as follows:
* a widget upon size-request reports the width and height that it finds
* to be best suited to display its contents, including children.
* the width and/or height reported from a widget upon size requisition
* may be overidden by the user by specifying a width and/or height
* other than 0 through gtk_widget_set_usize().
*
* a scrolled window needs (for imlementing all three policy types) to
* request its width and height based on two different rationales.
* 1) the user wants the scrolled window to just fit into the space
* that it gets allocated for a specifc dimension.
* 1.1) this does not apply if the user specified a concrete value
* value for that specific dimension by either specifying usize for the
* scrolled window or for its child.
* 2) the user wants the scrolled window to take as much space up as
* is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
*
* also, kinda obvious:
* 3) a user would certainly not have choosen a scrolled window as a container
* for the child, if the resulting allocation takes up more space than the
* child would have allocated without the scrolled window.
*
* conclusions:
* A) from 1) follows: the scrolled window shouldn't request more space for a
* specifc dimension than is required at minimum.
* B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
* window (done automatically) or by usize of the child (needs to be checked).
* C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
* child's dimension.
* D) from 3) follows: the scrolled window child's minimum width and minimum height
* under A) at least correspond to the space taken up by its scrollbars.
*/
#define SCROLLBAR_SPACING(w) (GTK_SCROLLED_WINDOW_CLASS (GTK_OBJECT (w)->klass)->scrollbar_spacing)
#define DEFAULT_SCROLLBAR_SPACING 3
enum {
ARG_0,
ARG_HADJUSTMENT,
ARG_VADJUSTMENT,
ARG_HSCROLLBAR_POLICY,
ARG_VSCROLLBAR_POLICY,
ARG_WINDOW_PLACEMENT
};
static void gtk_scrolled_window_class_init (GtkScrolledWindowClass *klass);
static void gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window);
static void gtk_scrolled_window_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_scrolled_window_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_scrolled_window_destroy (GtkObject *object);
static void gtk_scrolled_window_finalize (GtkObject *object);
static void gtk_scrolled_window_map (GtkWidget *widget);
static void gtk_scrolled_window_unmap (GtkWidget *widget);
static void gtk_scrolled_window_draw (GtkWidget *widget,
GdkRectangle *area);
static void gtk_scrolled_window_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gint gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event);
static void gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void gtk_scrolled_window_relative_allocation(GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data);
static GtkContainerClass *parent_class = NULL;
GtkType
gtk_scrolled_window_get_type (void)
{
static GtkType scrolled_window_type = 0;
if (!scrolled_window_type)
{
static const GtkTypeInfo scrolled_window_info =
{
"GtkScrolledWindow",
sizeof (GtkScrolledWindow),
sizeof (GtkScrolledWindowClass),
(GtkClassInitFunc) gtk_scrolled_window_class_init,
(GtkObjectInitFunc) gtk_scrolled_window_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
scrolled_window_type = gtk_type_unique (GTK_TYPE_BIN, &scrolled_window_info);
}
return scrolled_window_type;
}
static void
gtk_scrolled_window_class_init (GtkScrolledWindowClass *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_BIN);
gtk_object_add_arg_type ("GtkScrolledWindow::hadjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_HADJUSTMENT);
gtk_object_add_arg_type ("GtkScrolledWindow::vadjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_VADJUSTMENT);
gtk_object_add_arg_type ("GtkScrolledWindow::hscrollbar_policy",
GTK_TYPE_POLICY_TYPE,
GTK_ARG_READWRITE,
ARG_HSCROLLBAR_POLICY);
gtk_object_add_arg_type ("GtkScrolledWindow::vscrollbar_policy",
GTK_TYPE_POLICY_TYPE,
GTK_ARG_READWRITE,
ARG_VSCROLLBAR_POLICY);
gtk_object_add_arg_type ("GtkScrolledWindow::window_placement",
GTK_TYPE_CORNER_TYPE,
GTK_ARG_READWRITE,
ARG_WINDOW_PLACEMENT);
object_class->set_arg = gtk_scrolled_window_set_arg;
object_class->get_arg = gtk_scrolled_window_get_arg;
object_class->destroy = gtk_scrolled_window_destroy;
object_class->finalize = gtk_scrolled_window_finalize;
widget_class->map = gtk_scrolled_window_map;
widget_class->unmap = gtk_scrolled_window_unmap;
widget_class->draw = gtk_scrolled_window_draw;
widget_class->size_request = gtk_scrolled_window_size_request;
widget_class->size_allocate = gtk_scrolled_window_size_allocate;
widget_class->scroll_event = gtk_scrolled_window_scroll_event;
container_class->add = gtk_scrolled_window_add;
container_class->remove = gtk_scrolled_window_remove;
container_class->forall = gtk_scrolled_window_forall;
class->scrollbar_spacing = DEFAULT_SCROLLBAR_SPACING;
}
static void
gtk_scrolled_window_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkScrolledWindow *scrolled_window;
scrolled_window = GTK_SCROLLED_WINDOW (object);
switch (arg_id)
{
case ARG_HADJUSTMENT:
gtk_scrolled_window_set_hadjustment (scrolled_window, GTK_VALUE_POINTER (*arg));
break;
case ARG_VADJUSTMENT:
gtk_scrolled_window_set_vadjustment (scrolled_window, GTK_VALUE_POINTER (*arg));
break;
case ARG_HSCROLLBAR_POLICY:
gtk_scrolled_window_set_policy (scrolled_window,
GTK_VALUE_ENUM (*arg),
scrolled_window->vscrollbar_policy);
break;
case ARG_VSCROLLBAR_POLICY:
gtk_scrolled_window_set_policy (scrolled_window,
scrolled_window->hscrollbar_policy,
GTK_VALUE_ENUM (*arg));
break;
case ARG_WINDOW_PLACEMENT:
gtk_scrolled_window_set_placement (scrolled_window,
GTK_VALUE_ENUM (*arg));
break;
default:
break;
}
}
static void
gtk_scrolled_window_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkScrolledWindow *scrolled_window;
scrolled_window = GTK_SCROLLED_WINDOW (object);
switch (arg_id)
{
case ARG_HADJUSTMENT:
GTK_VALUE_POINTER (*arg) = gtk_scrolled_window_get_hadjustment (scrolled_window);
break;
case ARG_VADJUSTMENT:
GTK_VALUE_POINTER (*arg) = gtk_scrolled_window_get_vadjustment (scrolled_window);
break;
case ARG_HSCROLLBAR_POLICY:
GTK_VALUE_ENUM (*arg) = scrolled_window->hscrollbar_policy;
break;
case ARG_VSCROLLBAR_POLICY:
GTK_VALUE_ENUM (*arg) = scrolled_window->vscrollbar_policy;
break;
case ARG_WINDOW_PLACEMENT:
GTK_VALUE_ENUM (*arg) = scrolled_window->window_placement;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW);
gtk_container_set_resize_mode (GTK_CONTAINER (scrolled_window), GTK_RESIZE_QUEUE);
scrolled_window->hscrollbar = NULL;
scrolled_window->vscrollbar = NULL;
scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
scrolled_window->hscrollbar_visible = FALSE;
scrolled_window->vscrollbar_visible = FALSE;
scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
}
GtkWidget*
gtk_scrolled_window_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkWidget *scrolled_window;
if (hadjustment)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
if (vadjustment)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
"hadjustment", hadjustment,
"vadjustment", vadjustment,
NULL);
return scrolled_window;
}
void
gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *hadjustment)
{
GtkBin *bin;
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (hadjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
else
hadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
bin = GTK_BIN (scrolled_window);
if (!scrolled_window->hscrollbar)
{
gtk_widget_push_composite_child ();
scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
gtk_widget_pop_composite_child ();
gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
gtk_widget_ref (scrolled_window->hscrollbar);
gtk_widget_show (scrolled_window->hscrollbar);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
if (old_adjustment == hadjustment)
return;
gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
hadjustment);
}
hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
gtk_signal_connect (GTK_OBJECT (hadjustment),
"changed",
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
if (bin->child)
gtk_widget_set_scroll_adjustments (bin->child,
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
}
void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *vadjustment)
{
GtkBin *bin;
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (vadjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
else
vadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
bin = GTK_BIN (scrolled_window);
if (!scrolled_window->vscrollbar)
{
gtk_widget_push_composite_child ();
scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
gtk_widget_pop_composite_child ();
gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
gtk_widget_ref (scrolled_window->vscrollbar);
gtk_widget_show (scrolled_window->vscrollbar);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
if (old_adjustment == vadjustment)
return;
gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
vadjustment);
}
vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
gtk_signal_connect (GTK_OBJECT (vadjustment),
"changed",
GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
scrolled_window);
gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
if (bin->child)
gtk_widget_set_scroll_adjustments (bin->child,
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
}
GtkAdjustment*
gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (scrolled_window != NULL, NULL);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return (scrolled_window->hscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
NULL);
}
GtkAdjustment*
gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (scrolled_window != NULL, NULL);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return (scrolled_window->vscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
NULL);
}
void
gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType hscrollbar_policy,
GtkPolicyType vscrollbar_policy)
{
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
(scrolled_window->vscrollbar_policy != vscrollbar_policy))
{
scrolled_window->hscrollbar_policy = hscrollbar_policy;
scrolled_window->vscrollbar_policy = vscrollbar_policy;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
void
gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
GtkCornerType window_placement)
{
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (scrolled_window->window_placement != window_placement)
{
scrolled_window->window_placement = window_placement;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
static void
gtk_scrolled_window_destroy (GtkObject *object)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (object != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
scrolled_window = GTK_SCROLLED_WINDOW (object);
gtk_widget_unparent (scrolled_window->hscrollbar);
gtk_widget_unparent (scrolled_window->vscrollbar);
gtk_widget_destroy (scrolled_window->hscrollbar);
gtk_widget_destroy (scrolled_window->vscrollbar);
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gtk_scrolled_window_finalize (GtkObject *object)
{
GtkScrolledWindow *scrolled_window;
scrolled_window = GTK_SCROLLED_WINDOW (object);
gtk_widget_unref (scrolled_window->hscrollbar);
gtk_widget_unref (scrolled_window->vscrollbar);
GTK_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gtk_scrolled_window_map (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
scrolled_window = GTK_SCROLLED_WINDOW (widget);
/* chain parent class handler to map self and child */
GTK_WIDGET_CLASS (parent_class)->map (widget);
if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar) &&
!GTK_WIDGET_MAPPED (scrolled_window->hscrollbar))
gtk_widget_map (scrolled_window->hscrollbar);
if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar) &&
!GTK_WIDGET_MAPPED (scrolled_window->vscrollbar))
gtk_widget_map (scrolled_window->vscrollbar);
}
static void
gtk_scrolled_window_unmap (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
scrolled_window = GTK_SCROLLED_WINDOW (widget);
/* chain parent class handler to unmap self and child */
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
if (GTK_WIDGET_MAPPED (scrolled_window->hscrollbar))
gtk_widget_unmap (scrolled_window->hscrollbar);
if (GTK_WIDGET_MAPPED (scrolled_window->vscrollbar))
gtk_widget_unmap (scrolled_window->vscrollbar);
}
static void
gtk_scrolled_window_draw (GtkWidget *widget,
GdkRectangle *area)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (area != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (widget);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child) &&
gtk_widget_intersect (bin->child, area, &child_area))
gtk_widget_draw (bin->child, &child_area);
if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar) &&
gtk_widget_intersect (scrolled_window->hscrollbar, area, &child_area))
gtk_widget_draw (scrolled_window->hscrollbar, &child_area);
if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar) &&
gtk_widget_intersect (scrolled_window->vscrollbar, area, &child_area))
gtk_widget_draw (scrolled_window->vscrollbar, &child_area);
}
static void
gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (callback != NULL);
GTK_CONTAINER_CLASS (parent_class)->forall (container,
include_internals,
callback,
callback_data);
if (include_internals)
{
GtkScrolledWindow *scrolled_window;
scrolled_window = GTK_SCROLLED_WINDOW (container);
if (scrolled_window->vscrollbar)
callback (scrolled_window->vscrollbar, callback_data);
if (scrolled_window->hscrollbar)
callback (scrolled_window->hscrollbar, callback_data);
}
}
static void
gtk_scrolled_window_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
gint extra_width;
gint extra_height;
GtkRequisition hscrollbar_requisition;
GtkRequisition vscrollbar_requisition;
GtkRequisition child_requisition;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (requisition != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (scrolled_window);
extra_width = 0;
extra_height = 0;
requisition->width = 0;
requisition->height = 0;
gtk_widget_size_request (scrolled_window->hscrollbar,
&hscrollbar_requisition);
gtk_widget_size_request (scrolled_window->vscrollbar,
&vscrollbar_requisition);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
static guint quark_aux_info = 0;
if (!quark_aux_info)
quark_aux_info = g_quark_from_static_string ("gtk-aux-info");
gtk_widget_size_request (bin->child, &child_requisition);
if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
requisition->width += child_requisition.width;
else
{
GtkWidgetAuxInfo *aux_info;
aux_info = gtk_object_get_data_by_id (GTK_OBJECT (bin->child), quark_aux_info);
if (aux_info && aux_info->width > 0)
{
requisition->width += aux_info->width;
extra_width = -1;
}
else
requisition->width += vscrollbar_requisition.width;
}
if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
requisition->height += child_requisition.height;
else
{
GtkWidgetAuxInfo *aux_info;
aux_info = gtk_object_get_data_by_id (GTK_OBJECT (bin->child), quark_aux_info);
if (aux_info && aux_info->height > 0)
{
requisition->height += aux_info->height;
extra_height = -1;
}
else
requisition->height += hscrollbar_requisition.height;
}
}
if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
{
requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
extra_height = SCROLLBAR_SPACING (scrolled_window) + hscrollbar_requisition.height;
}
if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
{
requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
extra_width = SCROLLBAR_SPACING (scrolled_window) + vscrollbar_requisition.width;
}
requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
}
static void
gtk_scrolled_window_relative_allocation (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (widget != NULL);
g_return_if_fail (allocation != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
allocation->x = GTK_CONTAINER (widget)->border_width;
allocation->y = GTK_CONTAINER (widget)->border_width;
allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
if (scrolled_window->vscrollbar_visible)
{
GtkRequisition vscrollbar_requisition;
gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
&vscrollbar_requisition);
if (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->x += (vscrollbar_requisition.width +
SCROLLBAR_SPACING (scrolled_window));
allocation->width = MAX (1, (gint)allocation->width -
((gint)vscrollbar_requisition.width +
(gint)SCROLLBAR_SPACING (scrolled_window)));
}
if (scrolled_window->hscrollbar_visible)
{
GtkRequisition hscrollbar_requisition;
gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
&hscrollbar_requisition);
if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->y += (hscrollbar_requisition.height +
SCROLLBAR_SPACING (scrolled_window));
allocation->height = MAX (1, (gint)allocation->height -
((gint)hscrollbar_requisition.height +
(gint)SCROLLBAR_SPACING (scrolled_window)));
}
}
static void
gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
GtkAllocation relative_allocation;
GtkAllocation child_allocation;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (allocation != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (scrolled_window);
widget->allocation = *allocation;
if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
scrolled_window->hscrollbar_visible = TRUE;
else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
scrolled_window->hscrollbar_visible = FALSE;
if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
scrolled_window->vscrollbar_visible = TRUE;
else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
scrolled_window->vscrollbar_visible = FALSE;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
gboolean previous_hvis;
gboolean previous_vvis;
guint count = 0;
do
{
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
child_allocation.x = relative_allocation.x + allocation->x;
child_allocation.y = relative_allocation.y + allocation->y;
child_allocation.width = relative_allocation.width;
child_allocation.height = relative_allocation.height;
previous_hvis = scrolled_window->hscrollbar_visible;
previous_vvis = scrolled_window->vscrollbar_visible;
gtk_widget_size_allocate (bin->child, &child_allocation);
/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visiblity, then we need both.
*/
if (count &&
previous_hvis != scrolled_window->hscrollbar_visible &&
previous_vvis != scrolled_window->vscrollbar_visible)
{
scrolled_window->hscrollbar_visible = TRUE;
scrolled_window->vscrollbar_visible = TRUE;
/* a new resize is already queued at this point,
* so we will immediatedly get reinvoked
*/
return;
}
count++;
}
while (previous_hvis != scrolled_window->hscrollbar_visible ||
previous_vvis != scrolled_window->vscrollbar_visible);
}
else
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
if (scrolled_window->hscrollbar_visible)
{
GtkRequisition hscrollbar_requisition;
gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
&hscrollbar_requisition);
if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
gtk_widget_show (scrolled_window->hscrollbar);
child_allocation.x = relative_allocation.x;
if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y = (relative_allocation.y +
relative_allocation.height +
SCROLLBAR_SPACING (scrolled_window));
else
child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
child_allocation.width = relative_allocation.width;
child_allocation.height = hscrollbar_requisition.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
}
else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
gtk_widget_hide (scrolled_window->hscrollbar);
if (scrolled_window->vscrollbar_visible)
{
GtkRequisition vscrollbar_requisition;
if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
gtk_widget_show (scrolled_window->vscrollbar);
gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
&vscrollbar_requisition);
if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)
child_allocation.x = (relative_allocation.x +
relative_allocation.width +
SCROLLBAR_SPACING (scrolled_window));
else
child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
child_allocation.y = relative_allocation.y;
child_allocation.width = vscrollbar_requisition.width;
child_allocation.height = relative_allocation.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
}
else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
gtk_widget_hide (scrolled_window->vscrollbar);
}
static gint
gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
{
GtkWidget *range;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
else
range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
if (range && GTK_WIDGET_VISIBLE (range))
{
GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
gfloat new_value;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_LEFT)
new_value = adj->value - adj->page_increment / 2;
else
new_value = adj->value + adj->page_increment / 2;
new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
gtk_adjustment_set_value (adj, new_value);
return TRUE;
}
return FALSE;
}
static void
gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkScrolledWindow *scrolled_win;
g_return_if_fail (adjustment != NULL);
g_return_if_fail (data != NULL);
scrolled_win = GTK_SCROLLED_WINDOW (data);
if (adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
{
if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = scrolled_win->hscrollbar_visible;
scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
adjustment->page_size);
if (scrolled_win->hscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
}
}
else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
{
if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = scrolled_win->vscrollbar_visible;
scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
adjustment->page_size);
if (scrolled_win->vscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
}
}
}
static void
gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *child)
{
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
bin = GTK_BIN (container);
g_return_if_fail (bin->child == NULL);
scrolled_window = GTK_SCROLLED_WINDOW (container);
bin->child = child;
gtk_widget_set_parent (child, GTK_WIDGET (bin));
/* this is a temporary message */
if (!gtk_widget_set_scroll_adjustments (child,
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
"use gtk_scrolled_window_add_with_viewport() instead");
if (GTK_WIDGET_REALIZED (child->parent))
gtk_widget_realize (child);
if (GTK_WIDGET_VISIBLE (child->parent) && GTK_WIDGET_VISIBLE (child))
{
if (GTK_WIDGET_MAPPED (child->parent))
gtk_widget_map (child);
gtk_widget_queue_resize (child);
}
}
static void
gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *child)
{
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (child != NULL);
g_return_if_fail (GTK_BIN (container)->child == child);
gtk_widget_set_scroll_adjustments (child, NULL, NULL);
/* chain parent class handler to remove child */
GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
}
void
gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
GtkWidget *child)
{
GtkBin *bin;
GtkWidget *viewport;
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (child != NULL);
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (child->parent == NULL);
bin = GTK_BIN (scrolled_window);
if (bin->child != NULL)
{
g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
viewport = bin->child;
}
else
{
viewport =
gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
gtk_scrolled_window_get_vadjustment (scrolled_window));
gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
}
gtk_widget_show (viewport);
gtk_container_add (GTK_CONTAINER (viewport), child);
}
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