gtk2/gtk/gtklayout.c
Tim Janik afee2c67c5 applied patch from Andreas Persenius <ndap@swipnet.se> that updates the
Wed Jul 26 12:59:31 2000  Tim Janik  <timj@gtk.org>

        * *.[hc]: applied patch from Andreas Persenius <ndap@swipnet.se> that
        updates the license headers to the GNU Lesser General Public License,
        as well as updating the copyright year to 2000.
2000-07-26 11:33:08 +00:00

771 lines
20 KiB
C

/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* GtkLayout: Widget for scrolling of arbitrary-sized areas.
*
* Copyright Owen Taylor, 1998
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "gdkconfig.h"
#include "gtklayout.h"
#include "gtksignal.h"
#include "gtkprivate.h"
typedef struct _GtkLayoutChild GtkLayoutChild;
struct _GtkLayoutChild {
GtkWidget *widget;
gint x;
gint y;
};
static void gtk_layout_class_init (GtkLayoutClass *class);
static void gtk_layout_init (GtkLayout *layout);
static void gtk_layout_finalize (GObject *object);
static void gtk_layout_realize (GtkWidget *widget);
static void gtk_layout_unrealize (GtkWidget *widget);
static void gtk_layout_map (GtkWidget *widget);
static void gtk_layout_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_layout_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_layout_draw (GtkWidget *widget,
GdkRectangle *area);
static gint gtk_layout_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_layout_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_layout_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void gtk_layout_set_adjustments (GtkLayout *layout,
GtkAdjustment *hadj,
GtkAdjustment *vadj);
static void gtk_layout_allocate_child (GtkLayout *layout,
GtkLayoutChild *child);
static void gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
GtkLayout *layout);
static GtkWidgetClass *parent_class = NULL;
/* Public interface
*/
GtkWidget*
gtk_layout_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkLayout *layout;
layout = gtk_type_new (GTK_TYPE_LAYOUT);
gtk_layout_set_adjustments (layout, hadjustment, vadjustment);
return GTK_WIDGET (layout);
}
GtkAdjustment*
gtk_layout_get_hadjustment (GtkLayout *layout)
{
g_return_val_if_fail (layout != NULL, NULL);
g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
return layout->hadjustment;
}
GtkAdjustment*
gtk_layout_get_vadjustment (GtkLayout *layout)
{
g_return_val_if_fail (layout != NULL, NULL);
g_return_val_if_fail (GTK_IS_LAYOUT (layout), NULL);
return layout->vadjustment;
}
static void
gtk_layout_set_adjustments (GtkLayout *layout,
GtkAdjustment *hadj,
GtkAdjustment *vadj)
{
gboolean need_adjust = FALSE;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
if (hadj)
g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
else
hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (vadj)
g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
else
vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (layout->hadjustment && (layout->hadjustment != hadj))
{
gtk_signal_disconnect_by_data (GTK_OBJECT (layout->hadjustment), layout);
gtk_object_unref (GTK_OBJECT (layout->hadjustment));
}
if (layout->vadjustment && (layout->vadjustment != vadj))
{
gtk_signal_disconnect_by_data (GTK_OBJECT (layout->vadjustment), layout);
gtk_object_unref (GTK_OBJECT (layout->vadjustment));
}
if (layout->hadjustment != hadj)
{
layout->hadjustment = hadj;
gtk_object_ref (GTK_OBJECT (layout->hadjustment));
gtk_object_sink (GTK_OBJECT (layout->hadjustment));
gtk_signal_connect (GTK_OBJECT (layout->hadjustment), "value_changed",
(GtkSignalFunc) gtk_layout_adjustment_changed,
layout);
need_adjust = TRUE;
}
if (layout->vadjustment != vadj)
{
layout->vadjustment = vadj;
gtk_object_ref (GTK_OBJECT (layout->vadjustment));
gtk_object_sink (GTK_OBJECT (layout->vadjustment));
gtk_signal_connect (GTK_OBJECT (layout->vadjustment), "value_changed",
(GtkSignalFunc) gtk_layout_adjustment_changed,
layout);
need_adjust = TRUE;
}
if (need_adjust)
gtk_layout_adjustment_changed (NULL, layout);
}
static void
gtk_layout_finalize (GObject *object)
{
GtkLayout *layout = GTK_LAYOUT (object);
gtk_object_unref (GTK_OBJECT (layout->hadjustment));
gtk_object_unref (GTK_OBJECT (layout->vadjustment));
G_OBJECT_CLASS (parent_class)->finalize (object);
}
void
gtk_layout_set_hadjustment (GtkLayout *layout,
GtkAdjustment *adjustment)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
gtk_layout_set_adjustments (layout, adjustment, layout->vadjustment);
}
void
gtk_layout_set_vadjustment (GtkLayout *layout,
GtkAdjustment *adjustment)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
gtk_layout_set_adjustments (layout, layout->hadjustment, adjustment);
}
void
gtk_layout_put (GtkLayout *layout,
GtkWidget *child_widget,
gint x,
gint y)
{
GtkLayoutChild *child;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
g_return_if_fail (child_widget != NULL);
g_return_if_fail (GTK_IS_WIDGET (child_widget));
child = g_new (GtkLayoutChild, 1);
child->widget = child_widget;
child->x = x;
child->y = y;
layout->children = g_list_append (layout->children, child);
gtk_widget_set_parent (child_widget, GTK_WIDGET (layout));
if (GTK_WIDGET_REALIZED (layout))
gtk_widget_set_parent_window (child->widget, layout->bin_window);
if (GTK_WIDGET_REALIZED (layout))
gtk_widget_realize (child_widget);
if (GTK_WIDGET_VISIBLE (layout) && GTK_WIDGET_VISIBLE (child_widget))
{
if (GTK_WIDGET_MAPPED (layout))
gtk_widget_map (child_widget);
gtk_widget_queue_resize (child_widget);
}
}
void
gtk_layout_move (GtkLayout *layout,
GtkWidget *child_widget,
gint x,
gint y)
{
GList *tmp_list;
GtkLayoutChild *child;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
tmp_list = layout->children;
while (tmp_list)
{
child = tmp_list->data;
tmp_list = tmp_list->next;
if (child->widget == child_widget)
{
child->x = x;
child->y = y;
if (GTK_WIDGET_VISIBLE (child_widget) && GTK_WIDGET_VISIBLE (layout))
gtk_widget_queue_resize (child_widget);
return;
}
}
}
static void
gtk_layout_set_adjustment_upper (GtkAdjustment *adj, gfloat upper)
{
if (upper != adj->upper)
{
gfloat min = MAX (0., upper - adj->page_size);
gboolean value_changed = FALSE;
adj->upper = upper;
if (adj->value > min)
{
adj->value = min;
value_changed = TRUE;
}
gtk_signal_emit_by_name (GTK_OBJECT (adj), "changed");
if (value_changed)
gtk_signal_emit_by_name (GTK_OBJECT (adj), "value_changed");
}
}
void
gtk_layout_set_size (GtkLayout *layout,
guint width,
guint height)
{
GtkWidget *widget;
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
widget = GTK_WIDGET (layout);
layout->width = width;
layout->height = height;
gtk_layout_set_adjustment_upper (layout->hadjustment, layout->width);
gtk_layout_set_adjustment_upper (layout->vadjustment, layout->height);
if (GTK_WIDGET_REALIZED (layout))
{
width = MAX (width, widget->allocation.width);
height = MAX (height, widget->allocation.height);
gdk_window_resize (layout->bin_window, width, height);
}
}
void
gtk_layout_freeze (GtkLayout *layout)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
layout->freeze_count++;
}
void
gtk_layout_thaw (GtkLayout *layout)
{
g_return_if_fail (layout != NULL);
g_return_if_fail (GTK_IS_LAYOUT (layout));
if (layout->freeze_count)
if (!(--layout->freeze_count))
gtk_widget_draw (GTK_WIDGET (layout), NULL);
}
/* Basic Object handling procedures
*/
GtkType
gtk_layout_get_type (void)
{
static GtkType layout_type = 0;
if (!layout_type)
{
static const GTypeInfo layout_info =
{
sizeof (GtkLayoutClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gtk_layout_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkLayout),
16, /* n_preallocs */
(GInstanceInitFunc) gtk_layout_init,
};
layout_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkLayout", &layout_info);
}
return layout_type;
}
static void
gtk_layout_class_init (GtkLayoutClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (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_CONTAINER);
gobject_class->finalize = gtk_layout_finalize;
widget_class->realize = gtk_layout_realize;
widget_class->unrealize = gtk_layout_unrealize;
widget_class->map = gtk_layout_map;
widget_class->size_request = gtk_layout_size_request;
widget_class->size_allocate = gtk_layout_size_allocate;
widget_class->draw = gtk_layout_draw;
widget_class->expose_event = gtk_layout_expose;
container_class->remove = gtk_layout_remove;
container_class->forall = gtk_layout_forall;
class->set_scroll_adjustments = gtk_layout_set_adjustments;
widget_class->set_scroll_adjustments_signal =
gtk_signal_new ("set_scroll_adjustments",
GTK_RUN_LAST,
GTK_CLASS_TYPE (object_class),
GTK_SIGNAL_OFFSET (GtkLayoutClass, set_scroll_adjustments),
gtk_marshal_NONE__POINTER_POINTER,
GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
}
static void
gtk_layout_init (GtkLayout *layout)
{
layout->children = NULL;
layout->width = 100;
layout->height = 100;
layout->hadjustment = NULL;
layout->vadjustment = NULL;
layout->bin_window = NULL;
layout->scroll_x = 0;
layout->scroll_y = 0;
layout->visibility = GDK_VISIBILITY_PARTIAL;
layout->freeze_count = 0;
}
/* Widget methods
*/
static void
gtk_layout_realize (GtkWidget *widget)
{
GList *tmp_list;
GtkLayout *layout;
GdkWindowAttr attributes;
gint attributes_mask;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = GDK_VISIBILITY_NOTIFY_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, widget);
attributes.x = 0;
attributes.y = 0;
attributes.width = MAX (layout->width, widget->allocation.width);
attributes.height = MAX (layout->height, widget->allocation.height);
attributes.event_mask = GDK_EXPOSURE_MASK | GDK_SCROLL_MASK |
gtk_widget_get_events (widget);
layout->bin_window = gdk_window_new (widget->window,
&attributes, attributes_mask);
gdk_window_set_user_data (layout->bin_window, widget);
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, layout->bin_window, GTK_STATE_NORMAL);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
gtk_widget_set_parent_window (child->widget, layout->bin_window);
}
}
static void
gtk_layout_map (GtkWidget *widget)
{
GList *tmp_list;
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
if (GTK_WIDGET_VISIBLE (child->widget))
{
if (!GTK_WIDGET_MAPPED (child->widget))
gtk_widget_map (child->widget);
}
}
gdk_window_show (layout->bin_window);
gdk_window_show (widget->window);
}
static void
gtk_layout_unrealize (GtkWidget *widget)
{
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
gdk_window_set_user_data (layout->bin_window, NULL);
gdk_window_destroy (layout->bin_window);
layout->bin_window = NULL;
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
static void
gtk_layout_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GList *tmp_list;
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
requisition->width = 0;
requisition->height = 0;
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
GtkRequisition child_requisition;
tmp_list = tmp_list->next;
gtk_widget_size_request (child->widget, &child_requisition);
}
}
static void
gtk_layout_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GList *tmp_list;
GtkLayout *layout;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
widget->allocation = *allocation;
layout = GTK_LAYOUT (widget);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
gtk_layout_allocate_child (layout, child);
}
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_move_resize (widget->window,
allocation->x, allocation->y,
allocation->width, allocation->height);
gdk_window_resize (layout->bin_window,
MAX (layout->width, allocation->width),
MAX (layout->height, allocation->height));
}
layout->hadjustment->page_size = allocation->width;
layout->hadjustment->page_increment = allocation->width / 2;
layout->hadjustment->lower = 0;
layout->hadjustment->upper = MAX (allocation->width, layout->width);
gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment), "changed");
layout->vadjustment->page_size = allocation->height;
layout->vadjustment->page_increment = allocation->height / 2;
layout->vadjustment->lower = 0;
layout->vadjustment->upper = MAX (allocation->height, layout->height);
gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment), "changed");
}
static void
gtk_layout_draw (GtkWidget *widget, GdkRectangle *area)
{
GList *tmp_list;
GtkLayout *layout;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LAYOUT (widget));
layout = GTK_LAYOUT (widget);
/* We don't have any way of telling themes about this properly,
* so we just assume a background pixmap
*/
if (!GTK_WIDGET_APP_PAINTABLE (widget))
gdk_window_clear_area (layout->bin_window,
area->x, area->y, area->width, area->height);
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
if (gtk_widget_intersect (child->widget, area, &child_area))
gtk_widget_draw (child->widget, &child_area);
}
}
static gint
gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
{
GList *tmp_list;
GtkLayout *layout;
GdkEventExpose child_event;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_LAYOUT (widget), FALSE);
layout = GTK_LAYOUT (widget);
if (event->window != layout->bin_window)
return FALSE;
tmp_list = layout->children;
while (tmp_list)
{
GtkLayoutChild *child = tmp_list->data;
tmp_list = tmp_list->next;
child_event = *event;
if (GTK_WIDGET_DRAWABLE (child->widget) &&
GTK_WIDGET_NO_WINDOW (child->widget) &&
gtk_widget_intersect (child->widget, &event->area, &child_event.area))
gtk_widget_event (child->widget, (GdkEvent*) &child_event);
}
return FALSE;
}
/* Container method
*/
static void
gtk_layout_remove (GtkContainer *container,
GtkWidget *widget)
{
GList *tmp_list;
GtkLayout *layout;
GtkLayoutChild *child = NULL;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_LAYOUT (container));
layout = GTK_LAYOUT (container);
tmp_list = layout->children;
while (tmp_list)
{
child = tmp_list->data;
if (child->widget == widget)
break;
tmp_list = tmp_list->next;
}
if (tmp_list)
{
gtk_widget_unparent (widget);
layout->children = g_list_remove_link (layout->children, tmp_list);
g_list_free_1 (tmp_list);
g_free (child);
}
}
static void
gtk_layout_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkLayout *layout;
GtkLayoutChild *child;
GList *tmp_list;
g_return_if_fail (container != NULL);
g_return_if_fail (GTK_IS_LAYOUT (container));
g_return_if_fail (callback != NULL);
layout = GTK_LAYOUT (container);
tmp_list = layout->children;
while (tmp_list)
{
child = tmp_list->data;
tmp_list = tmp_list->next;
(* callback) (child->widget, callback_data);
}
}
/* Operations on children
*/
static void
gtk_layout_allocate_child (GtkLayout *layout,
GtkLayoutChild *child)
{
GtkAllocation allocation;
GtkRequisition requisition;
allocation.x = child->x - layout->xoffset;
allocation.y = child->y - layout->yoffset;
gtk_widget_get_child_requisition (child->widget, &requisition);
allocation.width = requisition.width;
allocation.height = requisition.height;
gtk_widget_size_allocate (child->widget, &allocation);
}
/* Callbacks */
static void
gtk_layout_adjustment_changed (GtkAdjustment *adjustment,
GtkLayout *layout)
{
GtkWidget *widget;
widget = GTK_WIDGET (layout);
if (layout->freeze_count)
return;
if (GTK_WIDGET_REALIZED (layout))
{
gdk_window_move (layout->bin_window,
- layout->hadjustment->value,
- layout->vadjustment->value);
gdk_window_process_updates (layout->bin_window, TRUE);
}
}