/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Author :
* Damon Chaplin <damon@helixcode.com>
*
* Copyright 1999, Helix Code, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*
* EVScrolledBar is like GtkScrolledWindow but only scrolls the child widget
* vertically. It is intended for scrolling narrow vertical bars.
*/
#include <config.h>
#include <gtk/gtkarrow.h>
#include <gtk/gtkbutton.h>
#include <gtk/gtksignal.h>
#include "e-vscrolled-bar.h"
/* These are the offsets of the up & down buttons from the right and top/bottom
of the widget. */
#define E_VSCROLLED_BAR_BUTTON_X_OFFSET 2
#define E_VSCROLLED_BAR_BUTTON_Y_OFFSET 2
/* This is the time between scrolls. */
#define E_VSCROLLED_BAR_SCROLL_TIMEOUT 20
static void e_vscrolled_bar_class_init (EVScrolledBarClass *class);
static void e_vscrolled_bar_init (EVScrolledBar *vscrolled_bar);
static void e_vscrolled_bar_destroy (GtkObject *object);
static void e_vscrolled_bar_finalize (GtkObject *object);
static void e_vscrolled_bar_map (GtkWidget *widget);
static void e_vscrolled_bar_unmap (GtkWidget *widget);
static void e_vscrolled_bar_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void e_vscrolled_bar_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void e_vscrolled_bar_draw (GtkWidget *widget,
GdkRectangle *area);
static gint e_vscrolled_bar_button_press (GtkWidget *widget,
GdkEventButton *event);
static void e_vscrolled_bar_add (GtkContainer *container,
GtkWidget *child);
static void e_vscrolled_bar_remove (GtkContainer *container,
GtkWidget *child);
static void e_vscrolled_bar_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void e_vscrolled_bar_adjustment_changed (GtkAdjustment *adjustment,
gpointer data);
static void e_vscrolled_bar_button_pressed (GtkWidget *button,
EVScrolledBar *vscrolled_bar);
static void e_vscrolled_bar_button_released (GtkWidget *button,
EVScrolledBar *vscrolled_bar);
static void e_vscrolled_bar_button_clicked (GtkWidget *button,
EVScrolledBar *vscrolled_bar);
static gboolean e_vscrolled_bar_timeout_handler (gpointer data);
static GtkBinClass *parent_class;
GtkType
e_vscrolled_bar_get_type (void)
{
static GtkType e_vscrolled_bar_type = 0;
if (!e_vscrolled_bar_type) {
GtkTypeInfo e_vscrolled_bar_info = {
"EVScrolledBar",
sizeof (EVScrolledBar),
sizeof (EVScrolledBarClass),
(GtkClassInitFunc) e_vscrolled_bar_class_init,
(GtkObjectInitFunc) e_vscrolled_bar_init,
NULL, /* reserved 1 */
NULL, /* reserved 2 */
(GtkClassInitFunc) NULL
};
parent_class = gtk_type_class (GTK_TYPE_BIN);
e_vscrolled_bar_type = gtk_type_unique (GTK_TYPE_BIN,
&e_vscrolled_bar_info);
}
return e_vscrolled_bar_type;
}
static void
e_vscrolled_bar_class_init (EVScrolledBarClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
object_class = (GtkObjectClass *) class;
widget_class = (GtkWidgetClass *) class;
container_class = (GtkContainerClass *) class;
/* Method override */
object_class->destroy = e_vscrolled_bar_destroy;
object_class->finalize = e_vscrolled_bar_finalize;
widget_class->map = e_vscrolled_bar_map;
widget_class->unmap = e_vscrolled_bar_unmap;
widget_class->size_request = e_vscrolled_bar_size_request;
widget_class->size_allocate = e_vscrolled_bar_size_allocate;
widget_class->draw = e_vscrolled_bar_draw;
widget_class->button_press_event = e_vscrolled_bar_button_press;
container_class->add = e_vscrolled_bar_add;
container_class->remove = e_vscrolled_bar_remove;
container_class->forall = e_vscrolled_bar_forall;
}
static void
e_vscrolled_bar_init (EVScrolledBar *vscrolled_bar)
{
GtkWidget *arrow;
GTK_WIDGET_SET_FLAGS (vscrolled_bar, GTK_NO_WINDOW);
gtk_container_set_resize_mode (GTK_CONTAINER (vscrolled_bar),
GTK_RESIZE_QUEUE);
gtk_widget_push_composite_child ();
vscrolled_bar->up_button = gtk_button_new ();
gtk_widget_set_composite_name (vscrolled_bar->up_button,
"up_button");
gtk_widget_set_parent (vscrolled_bar->up_button,
GTK_WIDGET (vscrolled_bar));
arrow = gtk_arrow_new (GTK_ARROW_UP, GTK_SHADOW_OUT);
gtk_misc_set_padding (GTK_MISC (arrow), 1, 1);
gtk_widget_show (arrow);
gtk_container_add (GTK_CONTAINER (vscrolled_bar->up_button), arrow);
gtk_widget_show (vscrolled_bar->up_button);
gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->up_button), "pressed", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_pressed), vscrolled_bar);
gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->up_button), "released", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_released), vscrolled_bar);
gtk_signal_connect (GTK_OBJECT (vscrolled_bar->up_button), "clicked", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_clicked), vscrolled_bar);
vscrolled_bar->down_button = gtk_button_new ();
gtk_widget_set_composite_name (vscrolled_bar->up_button,
"down_button");
gtk_widget_set_parent (vscrolled_bar->down_button,
GTK_WIDGET (vscrolled_bar));
arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
gtk_misc_set_padding (GTK_MISC (arrow), 1, 1);
gtk_widget_show (arrow);
gtk_container_add (GTK_CONTAINER (vscrolled_bar->down_button), arrow);
gtk_widget_show (vscrolled_bar->down_button);
gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->down_button), "pressed", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_pressed), vscrolled_bar);
gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->down_button), "released", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_released), vscrolled_bar);
gtk_signal_connect (GTK_OBJECT (vscrolled_bar->down_button), "clicked", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_clicked), vscrolled_bar);
gtk_widget_pop_composite_child ();
vscrolled_bar->adjustment = NULL;
vscrolled_bar->timeout_id = 0;
vscrolled_bar->scrolling_up = FALSE;
vscrolled_bar->min_distance = -1.0;
vscrolled_bar->button_pressed = FALSE;
}
/**
* e_vscrolled_bar_new:
*
* @adjustment: The #GtkAdjustment to use for scrolling, or NULL.
* @Return: A new #EVScrolledBar.
*
* Creates a new #EVScrolledBar with the given adjustment.
**/
GtkWidget *
e_vscrolled_bar_new (GtkAdjustment *adjustment)
{
GtkWidget *vscrolled_bar;
vscrolled_bar = GTK_WIDGET (gtk_type_new (e_vscrolled_bar_get_type ()));
e_vscrolled_bar_set_adjustment (E_VSCROLLED_BAR (vscrolled_bar),
adjustment);
return vscrolled_bar;
}
static void
e_vscrolled_bar_destroy (GtkObject *object)
{
EVScrolledBar *vscrolled_bar;
vscrolled_bar = E_VSCROLLED_BAR (object);
if (vscrolled_bar->timeout_id) {
g_source_remove (vscrolled_bar->timeout_id);
vscrolled_bar->timeout_id = 0;
}
gtk_widget_unparent (vscrolled_bar->up_button);
gtk_widget_unparent (vscrolled_bar->down_button);
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
e_vscrolled_bar_finalize (GtkObject *object)
{
EVScrolledBar *vscrolled_bar;
vscrolled_bar = E_VSCROLLED_BAR (object);
gtk_object_unref (GTK_OBJECT (vscrolled_bar->adjustment));
GTK_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
e_vscrolled_bar_map (GtkWidget *widget)
{
EVScrolledBar *vscrolled_bar;
GtkAdjustment *adjustment;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
vscrolled_bar = E_VSCROLLED_BAR (widget);
/* chain parent class handler to map self and child */
GTK_WIDGET_CLASS (parent_class)->map (widget);
adjustment = vscrolled_bar->adjustment;
if (GTK_WIDGET_VISIBLE (vscrolled_bar->up_button)
&& adjustment->value != adjustment->lower
&& !GTK_WIDGET_MAPPED (vscrolled_bar->up_button))
gtk_widget_map (vscrolled_bar->up_button);
if (GTK_WIDGET_VISIBLE (vscrolled_bar->down_button)
&& adjustment->value < adjustment->upper - adjustment->page_size
&& !GTK_WIDGET_MAPPED (vscrolled_bar->down_button))
gtk_widget_map (vscrolled_bar->down_button);
}
static void
e_vscrolled_bar_unmap (GtkWidget *widget)
{
EVScrolledBar *vscrolled_bar;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
vscrolled_bar = E_VSCROLLED_BAR (widget);
/* chain parent class handler to unmap self and child */
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
if (GTK_WIDGET_MAPPED (vscrolled_bar->up_button))
gtk_widget_unmap (vscrolled_bar->up_button);
if (GTK_WIDGET_MAPPED (vscrolled_bar->down_button))
gtk_widget_unmap (vscrolled_bar->down_button);
}
static void
e_vscrolled_bar_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
EVScrolledBar *vscrolled_bar;
GtkBin *bin;
GtkRequisition child_requisition;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
g_return_if_fail (requisition != NULL);
vscrolled_bar = E_VSCROLLED_BAR (widget);
bin = GTK_BIN (widget);
requisition->width = 0;
requisition->height = 0;
/* We just return the requisition of the child widget, plus the
border width. */
if (bin->child && GTK_WIDGET_VISIBLE (bin->child)) {
gtk_widget_size_request (bin->child, &child_requisition);
*requisition = child_requisition;
}
/* We remember the requested heights of the up & down buttons. */
gtk_widget_size_request (vscrolled_bar->up_button,
&child_requisition);
vscrolled_bar->up_button_width = child_requisition.width;
vscrolled_bar->up_button_height = child_requisition.height;
gtk_widget_size_request (vscrolled_bar->down_button,
&child_requisition);
vscrolled_bar->down_button_width = child_requisition.width;
vscrolled_bar->down_button_height = child_requisition.height;
/* Add on the standard container border widths. */
requisition->width += GTK_CONTAINER (widget)->border_width * 2;
requisition->height += GTK_CONTAINER (widget)->border_width * 2;
}
static void
e_vscrolled_bar_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
EVScrolledBar *vscrolled_bar;
GtkBin *bin;
GtkAllocation button_allocation, child_allocation;
gint border_width;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
g_return_if_fail (allocation != NULL);
vscrolled_bar = E_VSCROLLED_BAR (widget);
bin = GTK_BIN (widget);
widget->allocation = *allocation;
border_width = GTK_CONTAINER (widget)->border_width;
child_allocation.x = border_width;
child_allocation.y = border_width;
child_allocation.width = allocation->width - 2 * border_width;
child_allocation.height = allocation->height - 2 * border_width;
gtk_widget_size_allocate (bin->child, &child_allocation);
button_allocation.x = allocation->width - border_width
- vscrolled_bar->up_button_width
- E_VSCROLLED_BAR_BUTTON_X_OFFSET;
button_allocation.y = border_width + E_VSCROLLED_BAR_BUTTON_Y_OFFSET;
button_allocation.width = vscrolled_bar->up_button_width;
button_allocation.height = vscrolled_bar->up_button_height;
gtk_widget_size_allocate (vscrolled_bar->up_button,
&button_allocation);
button_allocation.x = allocation->width - border_width
- vscrolled_bar->down_button_width
- E_VSCROLLED_BAR_BUTTON_X_OFFSET;
button_allocation.y = allocation->height - border_width
- vscrolled_bar->down_button_height
- E_VSCROLLED_BAR_BUTTON_Y_OFFSET;
button_allocation.width = vscrolled_bar->down_button_width;
button_allocation.height = vscrolled_bar->down_button_height;
gtk_widget_size_allocate (vscrolled_bar->down_button,
&button_allocation);
}
static void
e_vscrolled_bar_draw (GtkWidget *widget,
GdkRectangle *area)
{
EVScrolledBar *vscrolled_bar;
GtkBin *bin;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
g_return_if_fail (area != NULL);
vscrolled_bar = E_VSCROLLED_BAR (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_DRAWABLE (vscrolled_bar->up_button) &&
gtk_widget_intersect (vscrolled_bar->up_button, area, &child_area))
gtk_widget_draw (vscrolled_bar->up_button, &child_area);
if (GTK_WIDGET_DRAWABLE (vscrolled_bar->down_button) &&
gtk_widget_intersect (vscrolled_bar->down_button, area, &child_area))
gtk_widget_draw (vscrolled_bar->down_button, &child_area);
}
static gint
e_vscrolled_bar_button_press (GtkWidget *widget,
GdkEventButton *event)
{
EVScrolledBar *vscrolled_bar;
GtkAdjustment *adjustment;
gfloat new_value, step;
vscrolled_bar = E_VSCROLLED_BAR (widget);
adjustment = vscrolled_bar->adjustment;
step = adjustment->page_size;
if (event->button == 4) {
new_value = adjustment->value - step;
if (new_value <= adjustment->lower) {
new_value = adjustment->lower;
}
} else if (event->button == 5) {
new_value = adjustment->value + step;
if (new_value >= adjustment->upper - adjustment->page_size) {
new_value = adjustment->upper - adjustment->page_size;
}
} else
return FALSE;
if (adjustment->value != new_value) {
adjustment->value = new_value;
gtk_signal_emit_by_name (GTK_OBJECT (adjustment),
"value_changed");
return TRUE;
}
return FALSE;
}
static void
e_vscrolled_bar_add (GtkContainer *container,
GtkWidget *child)
{
EVScrolledBar *vscrolled_bar;
GtkBin *bin;
g_return_if_fail (container != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (container));
vscrolled_bar = E_VSCROLLED_BAR (container);
bin = GTK_BIN (container);
g_return_if_fail (bin->child == NULL);
bin->child = child;
gtk_widget_set_parent (child, GTK_WIDGET (bin));
gtk_widget_set_scroll_adjustments (child, NULL,
vscrolled_bar->adjustment);
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
e_vscrolled_bar_remove (GtkContainer *container,
GtkWidget *child)
{
g_return_if_fail (container != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (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);
}
static void
e_vscrolled_bar_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
g_return_if_fail (container != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (container));
g_return_if_fail (callback != NULL);
GTK_CONTAINER_CLASS (parent_class)->forall (container,
include_internals,
callback,
callback_data);
if (include_internals) {
EVScrolledBar *vscrolled_bar;
vscrolled_bar = E_VSCROLLED_BAR (container);
if (vscrolled_bar->up_button)
callback (vscrolled_bar->up_button, callback_data);
if (vscrolled_bar->down_button)
callback (vscrolled_bar->down_button, callback_data);
}
}
/**
* e_vscrolled_bar_get_adjustment:
*
* @vscrolled_bar: An #EVScrolledBar.
* @Return: The #GtkAdjustment used for scrolling @vscrolled_bar.
*
* Returns the #GtkAdjustment used for scrolling the #EVscrolledBar.
**/
GtkAdjustment*
e_vscrolled_bar_get_adjustment (EVScrolledBar *vscrolled_bar)
{
g_return_val_if_fail (vscrolled_bar != NULL, NULL);
g_return_val_if_fail (E_IS_VSCROLLED_BAR (vscrolled_bar), NULL);
return vscrolled_bar->adjustment;
}
/**
* e_vscrolled_bar_set_adjustment:
*
* @vscrolled_bar: An #EVScrolledBar.
* @adjustment: The #GtkAdjustment to use for scrolling @vscrolled_bar.
*
* Sets the #GtkAdjustment to use for scrolling the #EVscrolledBar.
**/
void
e_vscrolled_bar_set_adjustment (EVScrolledBar *vscrolled_bar,
GtkAdjustment *adjustment)
{
g_return_if_fail (vscrolled_bar != NULL);
g_return_if_fail (E_IS_VSCROLLED_BAR (vscrolled_bar));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
else
adjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
if (vscrolled_bar->adjustment == adjustment)
return;
if (vscrolled_bar->adjustment) {
gtk_signal_disconnect_by_func (GTK_OBJECT (vscrolled_bar->adjustment),
GTK_SIGNAL_FUNC (e_vscrolled_bar_adjustment_changed),
vscrolled_bar);
gtk_object_unref (GTK_OBJECT (vscrolled_bar->adjustment));
}
vscrolled_bar->adjustment = adjustment;
gtk_object_ref (GTK_OBJECT (vscrolled_bar->adjustment));
gtk_object_sink (GTK_OBJECT (vscrolled_bar->adjustment));
/* I've used connect_after here to avoid a problem when using a
GnomeCanvas as the child widget. When just using connect it would
leave a blank space when one of the buttons is hidden. We want
the GtkLayout to handle the scrolling before we hide any buttons. */
gtk_signal_connect_after (GTK_OBJECT (adjustment), "changed",
GTK_SIGNAL_FUNC (e_vscrolled_bar_adjustment_changed),
vscrolled_bar);
gtk_signal_connect_after (GTK_OBJECT (adjustment), "value_changed",
GTK_SIGNAL_FUNC (e_vscrolled_bar_adjustment_changed),
vscrolled_bar);
e_vscrolled_bar_adjustment_changed (adjustment, vscrolled_bar);
if (GTK_BIN (vscrolled_bar)->child)
gtk_widget_set_scroll_adjustments (GTK_BIN (vscrolled_bar)->child, NULL, adjustment);
}
static void
e_vscrolled_bar_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
EVScrolledBar *vscrolled_bar;
g_return_if_fail (adjustment != NULL);
g_return_if_fail (data != NULL);
#if 0
g_print ("Adjustment changed to: %g\n", adjustment->value);
#endif
vscrolled_bar = E_VSCROLLED_BAR (data);
if (!GTK_WIDGET_MAPPED (vscrolled_bar))
return;
/* If the adjustment value is not 0, show the up button. */
if (adjustment->value != adjustment->lower) {
gtk_widget_map (vscrolled_bar->up_button);
gdk_window_raise (vscrolled_bar->up_button->window);
} else {
gtk_widget_unmap (vscrolled_bar->up_button);
}
/* If the adjustment value is less than the maximum value, show the
down button. */
if (adjustment->value < adjustment->upper - adjustment->page_size) {
gtk_widget_map (vscrolled_bar->down_button);
gdk_window_raise (vscrolled_bar->down_button->window);
} else {
gtk_widget_unmap (vscrolled_bar->down_button);
}
}
static void
e_vscrolled_bar_button_pressed (GtkWidget *button,
EVScrolledBar *vscrolled_bar)
{
if (vscrolled_bar->timeout_id != 0)
g_source_remove (vscrolled_bar->timeout_id);
vscrolled_bar->timeout_id = g_timeout_add (E_VSCROLLED_BAR_SCROLL_TIMEOUT, e_vscrolled_bar_timeout_handler, vscrolled_bar);
vscrolled_bar->scrolling_up = (button == vscrolled_bar->up_button) ? TRUE : FALSE;
vscrolled_bar->min_distance = vscrolled_bar->adjustment->page_size / 4;
vscrolled_bar->button_pressed = TRUE;
e_vscrolled_bar_timeout_handler (vscrolled_bar);
}
static void
e_vscrolled_bar_button_released (GtkWidget *button,
EVScrolledBar *vscrolled_bar)
{
vscrolled_bar->button_pressed = FALSE;
}
/* This will be called when the user hits the space key to activate the button.
It will also be called just before button_released() is called, but since
we already handle that we simply return if the button is pressed. */
static void
e_vscrolled_bar_button_clicked (GtkWidget *button,
EVScrolledBar *vscrolled_bar)
{
if (vscrolled_bar->button_pressed)
return;
/* We act as if the button is pressed and released immediately. */
e_vscrolled_bar_button_pressed (button, vscrolled_bar);
vscrolled_bar->button_pressed = FALSE;
}
static gboolean
e_vscrolled_bar_timeout_handler (gpointer data)
{
EVScrolledBar *vscrolled_bar;
GtkAdjustment *adjustment;
gfloat new_value;
gboolean retval = TRUE;
vscrolled_bar = E_VSCROLLED_BAR (data);
adjustment = vscrolled_bar->adjustment;
GDK_THREADS_ENTER ();
/* Check if the user has released the button and we have already
scrolled the minimum distance. */
if (vscrolled_bar->button_pressed == FALSE
&& vscrolled_bar->min_distance <= 0) {
GDK_THREADS_LEAVE ();
return FALSE;
}
vscrolled_bar->min_distance -= adjustment->step_increment;
if (vscrolled_bar->scrolling_up) {
new_value = adjustment->value - adjustment->step_increment;
if (new_value <= adjustment->lower) {
new_value = adjustment->lower;
retval = FALSE;
}
} else {
new_value = adjustment->value + adjustment->step_increment;
if (new_value >= adjustment->upper - adjustment->page_size) {
new_value = adjustment->upper - adjustment->page_size;
retval = FALSE;
}
}
if (adjustment->value != new_value) {
adjustment->value = new_value;
gtk_signal_emit_by_name (GTK_OBJECT (adjustment),
"value_changed");
}
GDK_THREADS_LEAVE ();
return retval;
}
