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/*
* 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.
*
* See the COPYING file for license information.
*
* Guillaume Chazarain <guichaz@gmail.com>
*/
/******************************************
* The vertical and horizontal scrollbars *
******************************************/
#include "gliv.h"
#include "scrollbars.h"
#include "options.h"
#include "gliv-image.h"
#include "windows.h"
#include "matrix.h"
#include "params.h"
#include "rendering.h"
extern rt_struct *rt;
extern options_struct *options;
extern GlivImage *current_image;
/* Horizontal Scrollbar. */
static GtkHScrollbar *hscroll;
/* Vertical Scrollbar. */
static GtkVScrollbar *vscroll;
gboolean toggle_scrollbars(void)
{
GtkWidget *widgets[2];
widgets[0] = GTK_WIDGET(hscroll);
widgets[1] = GTK_WIDGET(vscroll);
if (toggle_widgets(widgets, 2, &options->scrollbars) && options->scrollbars)
update_scrollbars();
return FALSE;
}
static void changed_scrollbars(void)
{
gtk_adjustment_changed(gtk_range_get_adjustment(GTK_RANGE(hscroll)));
gtk_adjustment_changed(gtk_range_get_adjustment(GTK_RANGE(vscroll)));
}
/* Update a given scrollbar. */
static void update_scroll(GtkScrollbar * scroll, gfloat min, gfloat max,
gfloat dim)
{
GtkAdjustment *adj;
gboolean update_needed = FALSE;
gfloat previous;
adj = gtk_range_get_adjustment(GTK_RANGE(scroll));
/* Smallest length containing the image and the window = window U image. */
previous = adj->lower;
adj->lower = MIN(min, 0.0);
update_needed = update_needed || !float_equal(previous, adj->lower);
previous = adj->upper;
adj->upper = MAX(max, dim);
update_needed = update_needed || !float_equal(previous, adj->upper);
/* Window size. */
adj->page_size = dim;
adj->step_increment = MOVE_OFFSET;
adj->page_increment = dim;
/* The offset is actually computed with adj->lower and adj->upper. */
adj->value = 0.0;
if (update_needed)
do_later(G_PRIORITY_LOW, changed_scrollbars);
}
/* Update both scrollbars. */
void update_scrollbars(void)
{
gfloat min_x, max_x, min_y, max_y;
if (current_image == NULL || options->scrollbars == FALSE)
return;
get_matrix_bounding_box(&min_x, &max_x, &min_y, &max_y);
update_scroll(GTK_SCROLLBAR(hscroll), min_x, max_x,
(gfloat) rt->wid_size->width);
update_scroll(GTK_SCROLLBAR(vscroll), min_y, max_y,
(gfloat) rt->wid_size->height);
}
static gboolean scroll_val(GtkRange * range)
{
gfloat offset;
offset = -1.0 * gtk_range_get_value(range);
if (range == GTK_RANGE(hscroll))
matrix_move(offset, 0.0);
else
/* range == GTK_RANGE(vscroll) */
matrix_move(0.0, offset);
refresh(REFRESH_BURST | APPEND_HISTORY);
update_scrollbars();
return FALSE;
}
/* Called during the initialization to build the two scrollbars. */
GtkWidget *get_new_scrollbar(gboolean horizontal)
{
GtkRange *range;
if (horizontal) {
range = GTK_RANGE(gtk_hscrollbar_new(NULL));
hscroll = GTK_HSCROLLBAR(range);
} else {
range = GTK_RANGE(gtk_vscrollbar_new(NULL));
vscroll = GTK_VSCROLLBAR(range);
}
gtk_range_set_update_policy(range, GTK_UPDATE_CONTINUOUS);
g_signal_connect(range, "value-changed", G_CALLBACK(scroll_val), NULL);
return GTK_WIDGET(range);
}
void hide_scrollbars(void)
{
gtk_widget_hide(GTK_WIDGET(hscroll));
gtk_widget_hide(GTK_WIDGET(vscroll));
}
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