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gtk2/gtk/gtkscrolledwindow.c
PDT 1998 Shawn T. Amundson 92006c8e78 Changed LGPL address for FSF in all .h and .c files 
Sun Apr 12 18:54:29 PDT 1998 Shawn T. Amundson <amundson@gtk.org>

        * Changed LGPL address for FSF in all .h and .c files
1998-04-13 02:02:47 +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.
*/
#include "gtkscrolledwindow.h"
#include "gtksignal.h"
#define SCROLLBAR_SPACING(w) (GTK_SCROLLED_WINDOW_CLASS (GTK_OBJECT (w)->klass)->scrollbar_spacing)
static void gtk_scrolled_window_class_init (GtkScrolledWindowClass *klass);
static void gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window);
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 void gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_foreach (GtkContainer *container,
GtkCallback callback,
gpointer callback_data);
static void gtk_scrolled_window_viewport_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data);
static GtkContainerClass *parent_class = NULL;
guint
gtk_scrolled_window_get_type ()
{
static guint scrolled_window_type = 0;
if (!scrolled_window_type)
{
GtkTypeInfo scrolled_window_info =
{
"GtkScrolledWindow",
sizeof (GtkScrolledWindow),
sizeof (GtkScrolledWindowClass),
(GtkClassInitFunc) gtk_scrolled_window_class_init,
(GtkObjectInitFunc) gtk_scrolled_window_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL,
};
scrolled_window_type = gtk_type_unique (gtk_container_get_type (), &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_container_get_type ());
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;
container_class->add = gtk_scrolled_window_add;
container_class->remove = gtk_scrolled_window_remove;
container_class->foreach = gtk_scrolled_window_foreach;
class->scrollbar_spacing = 5;
}
static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW);
scrolled_window->hscrollbar = NULL;
scrolled_window->vscrollbar = NULL;
scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
}
GtkWidget*
gtk_scrolled_window_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkWidget *scrolled_window;
scrolled_window = gtk_type_new (gtk_scrolled_window_get_type ());
gtk_scrolled_window_construct (GTK_SCROLLED_WINDOW (scrolled_window), hadjustment, vadjustment);
return scrolled_window;
}
void
gtk_scrolled_window_construct (GtkScrolledWindow *scrolled_window,
GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (scrolled_window->viewport == NULL);
scrolled_window->viewport = gtk_viewport_new (hadjustment, vadjustment);
hadjustment = gtk_viewport_get_hadjustment (GTK_VIEWPORT (scrolled_window->viewport));
vadjustment = gtk_viewport_get_vadjustment (GTK_VIEWPORT (scrolled_window->viewport));
gtk_signal_connect (GTK_OBJECT (hadjustment), "changed",
(GtkSignalFunc) gtk_scrolled_window_adjustment_changed,
(gpointer) scrolled_window);
gtk_signal_connect (GTK_OBJECT (vadjustment), "changed",
(GtkSignalFunc) gtk_scrolled_window_adjustment_changed,
(gpointer) scrolled_window);
scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
gtk_widget_set_parent (scrolled_window->viewport, GTK_WIDGET (scrolled_window));
gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
gtk_widget_show (scrolled_window->viewport);
gtk_widget_show (scrolled_window->hscrollbar);
gtk_widget_show (scrolled_window->vscrollbar);
gtk_widget_ref (scrolled_window->viewport);
gtk_widget_ref (scrolled_window->hscrollbar);
gtk_widget_ref (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 gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
}
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 gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
}
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;
if (GTK_WIDGET (scrolled_window)->parent)
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_destroy (scrolled_window->viewport);
gtk_widget_destroy (scrolled_window->hscrollbar);
gtk_widget_destroy (scrolled_window->vscrollbar);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* 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->viewport);
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));
if (!GTK_WIDGET_MAPPED (widget))
{
GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
if (GTK_WIDGET_VISIBLE (scrolled_window->viewport) &&
!GTK_WIDGET_MAPPED (scrolled_window->viewport))
gtk_widget_map (scrolled_window->viewport);
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));
if (GTK_WIDGET_MAPPED (widget))
{
GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
if (GTK_WIDGET_MAPPED (scrolled_window->viewport))
gtk_widget_unmap (scrolled_window->viewport);
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;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (area != NULL);
if (GTK_WIDGET_DRAWABLE (widget))
{
scrolled_window = GTK_SCROLLED_WINDOW (widget);
if (gtk_widget_intersect (scrolled_window->viewport, area, &child_area))
gtk_widget_draw (scrolled_window->viewport, &child_area);
if (gtk_widget_intersect (scrolled_window->hscrollbar, area, &child_area))
gtk_widget_draw (scrolled_window->hscrollbar, &child_area);
if (gtk_widget_intersect (scrolled_window->vscrollbar, area, &child_area))
gtk_widget_draw (scrolled_window->vscrollbar, &child_area);
}
}
static void
gtk_scrolled_window_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkScrolledWindow *scrolled_window;
gint extra_height;
gint extra_width;
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);
requisition->width = 0;
requisition->height = 0;
if (GTK_WIDGET_VISIBLE (scrolled_window->viewport))
{
gtk_widget_size_request (scrolled_window->viewport, &scrolled_window->viewport->requisition);
requisition->width += scrolled_window->viewport->requisition.width;
requisition->height += scrolled_window->viewport->requisition.height;
}
extra_width = 0;
extra_height = 0;
if ((scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC) ||
GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
{
gtk_widget_size_request (scrolled_window->hscrollbar,
&scrolled_window->hscrollbar->requisition);
requisition->width = MAX (requisition->width, scrolled_window->hscrollbar->requisition.width);
extra_height = SCROLLBAR_SPACING (scrolled_window) + scrolled_window->hscrollbar->requisition.height;
}
if ((scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC) ||
GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
{
gtk_widget_size_request (scrolled_window->vscrollbar,
&scrolled_window->vscrollbar->requisition);
requisition->height = MAX (requisition->height, scrolled_window->vscrollbar->requisition.height);
extra_width = SCROLLBAR_SPACING (scrolled_window) + scrolled_window->vscrollbar->requisition.width;
}
requisition->width += GTK_CONTAINER (widget)->border_width * 2 + extra_width;
requisition->height += GTK_CONTAINER (widget)->border_width * 2 + extra_height;
}
static void
gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScrolledWindow *scrolled_window;
GtkAllocation viewport_allocation;
GtkAllocation child_allocation;
guint previous_hvis;
guint previous_vvis;
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);
widget->allocation = *allocation;
gtk_scrolled_window_viewport_allocate (widget, &viewport_allocation);
gtk_container_disable_resize (GTK_CONTAINER (scrolled_window));
if (GTK_WIDGET_VISIBLE (scrolled_window->viewport))
{
do {
gtk_scrolled_window_viewport_allocate (widget, &viewport_allocation);
child_allocation.x = viewport_allocation.x + allocation->x;
child_allocation.y = viewport_allocation.y + allocation->y;
child_allocation.width = viewport_allocation.width;
child_allocation.height = viewport_allocation.height;
previous_hvis = GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar);
previous_vvis = GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar);
gtk_widget_size_allocate (scrolled_window->viewport, &child_allocation);
} while ((previous_hvis != GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar)) ||
(previous_vvis != GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar)));
}
if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
{
child_allocation.x = viewport_allocation.x;
child_allocation.y = viewport_allocation.y + viewport_allocation.height + SCROLLBAR_SPACING (scrolled_window);
child_allocation.width = viewport_allocation.width;
child_allocation.height = scrolled_window->hscrollbar->requisition.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
}
if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
{
child_allocation.x = viewport_allocation.x + viewport_allocation.width + SCROLLBAR_SPACING (scrolled_window);
child_allocation.y = viewport_allocation.y;
child_allocation.width = scrolled_window->vscrollbar->requisition.width;
child_allocation.height = viewport_allocation.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
}
gtk_container_enable_resize (GTK_CONTAINER (scrolled_window));
}
static void
gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (widget != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (container);
gtk_container_add (GTK_CONTAINER (scrolled_window->viewport), widget);
}
static void
gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (widget != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (container);
if (scrolled_window->viewport == widget ||
scrolled_window->hscrollbar == widget ||
scrolled_window->vscrollbar == widget)
{
/* this happens during destroy */
gtk_widget_unparent (widget);
}
else
gtk_container_remove (GTK_CONTAINER (scrolled_window->viewport), widget);
}
static void
gtk_scrolled_window_foreach (GtkContainer *container,
GtkCallback callback,
gpointer callback_data)
{
GtkScrolledWindow *scrolled_window;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (callback != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (container);
(* callback) (scrolled_window->viewport, callback_data);
}
static void
gtk_scrolled_window_viewport_allocate (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, widget->allocation.width - allocation->x * 2);
allocation->height = MAX (1, widget->allocation.height - allocation->y * 2);
if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
allocation->width = MAX (1,
allocation->width - (scrolled_window->vscrollbar->requisition.width + SCROLLBAR_SPACING (scrolled_window)));
if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
allocation->height = MAX (1,
allocation->height - (scrolled_window->hscrollbar->requisition.height + SCROLLBAR_SPACING (scrolled_window)));
}
static void
gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkScrolledWindow *scrolled_win;
GtkWidget *scrollbar;
gint hide_scrollbar;
gint policy;
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)))
{
scrollbar = scrolled_win->hscrollbar;
policy = scrolled_win->hscrollbar_policy;
}
else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
{
scrollbar = scrolled_win->vscrollbar;
policy = scrolled_win->vscrollbar_policy;
}
else
{
g_warning ("could not determine which adjustment scrollbar received change signal for");
return;
}
if (policy == GTK_POLICY_AUTOMATIC)
{
hide_scrollbar = FALSE;
if ((adjustment->upper - adjustment->lower) <= adjustment->page_size)
hide_scrollbar = TRUE;
if (hide_scrollbar)
{
if (GTK_WIDGET_VISIBLE (scrollbar))
gtk_widget_hide (scrollbar);
}
else
{
if (!GTK_WIDGET_VISIBLE (scrollbar))
gtk_widget_show (scrollbar);
}
}
}
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