PIKApp/libpikawidgets/pikamemsizeentry.c

337 lines
9.6 KiB
C

/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikamemsizeentry.c
* Copyright (C) 2000-2003 Sven Neumann <sven@gimp.org>
*
* 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 3 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 Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "pikawidgetstypes.h"
#include "pikamemsizeentry.h"
#include "pikawidgets.h"
#include "libpika/libpika-intl.h"
/**
* SECTION: pikamemsizeentry
* @title: PikaMemSizeEntry
* @short_description: A composite widget to enter a memory size.
*
* Similar to a #PikaSizeEntry but instead of lengths, this widget is
* used to let the user enter memory sizes. A combo box allows one to
* switch between Kilobytes, Megabytes and Gigabytes. Used in the PIKA
* preferences dialog.
**/
enum
{
VALUE_CHANGED,
LAST_SIGNAL
};
struct _PikaMemsizeEntryPrivate
{
guint64 value;
guint64 lower;
guint64 upper;
guint shift;
/* adjustment is owned by spinbutton. Do not unref() it. */
GtkAdjustment *adjustment;
GtkWidget *spinbutton;
GtkWidget *menu;
};
#define GET_PRIVATE(obj) (((PikaMemsizeEntry *) (obj))->priv)
static void pika_memsize_entry_adj_callback (GtkAdjustment *adj,
PikaMemsizeEntry *entry);
static void pika_memsize_entry_unit_callback (GtkWidget *widget,
PikaMemsizeEntry *entry);
static guint64 pika_memsize_entry_get_rounded_value (PikaMemsizeEntry *entry,
guint64 value);
G_DEFINE_TYPE_WITH_PRIVATE (PikaMemsizeEntry, pika_memsize_entry, GTK_TYPE_BOX)
#define parent_class pika_memsize_entry_parent_class
static guint pika_memsize_entry_signals[LAST_SIGNAL] = { 0 };
static void
pika_memsize_entry_class_init (PikaMemsizeEntryClass *klass)
{
klass->value_changed = NULL;
pika_memsize_entry_signals[VALUE_CHANGED] =
g_signal_new ("value-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaMemsizeEntryClass, value_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
static void
pika_memsize_entry_init (PikaMemsizeEntry *entry)
{
entry->priv = pika_memsize_entry_get_instance_private (entry);
gtk_orientable_set_orientation (GTK_ORIENTABLE (entry),
GTK_ORIENTATION_HORIZONTAL);
gtk_box_set_spacing (GTK_BOX (entry), 4);
}
static void
pika_memsize_entry_adj_callback (GtkAdjustment *adj,
PikaMemsizeEntry *entry)
{
PikaMemsizeEntryPrivate *private = GET_PRIVATE (entry);
guint64 size = gtk_adjustment_get_value (adj);
if (pika_memsize_entry_get_rounded_value (entry, private->value) != size)
/* Do not allow losing accuracy if the converted/displayed value
* stays the same.
*/
private->value = size << private->shift;
g_signal_emit (entry, pika_memsize_entry_signals[VALUE_CHANGED], 0);
}
static void
pika_memsize_entry_unit_callback (GtkWidget *widget,
PikaMemsizeEntry *entry)
{
PikaMemsizeEntryPrivate *private = GET_PRIVATE (entry);
guint shift;
pika_int_combo_box_get_active (PIKA_INT_COMBO_BOX (widget), (gint *) &shift);
#if _MSC_VER < 1300
# define CAST (gint64)
#else
# define CAST
#endif
if (shift != private->shift)
{
private->shift = shift;
gtk_adjustment_configure (private->adjustment,
pika_memsize_entry_get_rounded_value (entry, private->value),
CAST private->lower >> shift,
CAST private->upper >> shift,
gtk_adjustment_get_step_increment (private->adjustment),
gtk_adjustment_get_page_increment (private->adjustment),
gtk_adjustment_get_page_size (private->adjustment));
}
#undef CAST
}
/**
* pika_memsize_entry_get_rounded_value:
* @entry: #PikaMemsizeEntry whose set unit is used.
* @value: value to convert to @entry unit, and rounded.
*
* Returns: the proper integer value to be displayed for current unit.
* This value has been appropriately rounded to the nearest
* integer, away from zero.
*/
static guint64
pika_memsize_entry_get_rounded_value (PikaMemsizeEntry *entry,
guint64 value)
{
PikaMemsizeEntryPrivate *private = GET_PRIVATE (entry);
guint64 converted;
#if _MSC_VER < 1300
# define CAST (gint64)
#else
# define CAST
#endif
converted = (CAST value >> private->shift) +
((CAST private->value >> (private->shift - 1)) & 1);
#undef CAST
return converted;
}
/**
* pika_memsize_entry_new:
* @value: the initial value (in Bytes)
* @lower: the lower limit for the value (in Bytes)
* @upper: the upper limit for the value (in Bytes)
*
* Creates a new #PikaMemsizeEntry which is a #GtkHBox with a #GtkSpinButton
* and a #GtkOptionMenu all setup to allow the user to enter memory sizes.
*
* Returns: Pointer to the new #PikaMemsizeEntry.
**/
GtkWidget *
pika_memsize_entry_new (guint64 value,
guint64 lower,
guint64 upper)
{
PikaMemsizeEntry *entry;
PikaMemsizeEntryPrivate *private;
guint shift;
#if _MSC_VER < 1300
# define CAST (gint64)
#else
# define CAST
#endif
g_return_val_if_fail (value >= lower && value <= upper, NULL);
entry = g_object_new (PIKA_TYPE_MEMSIZE_ENTRY, NULL);
private = GET_PRIVATE (entry);
for (shift = 30; shift > 10; shift -= 10)
{
if (value > (G_GUINT64_CONSTANT (1) << shift) &&
value % (G_GUINT64_CONSTANT (1) << shift) == 0)
break;
}
private->value = value;
private->lower = lower;
private->upper = upper;
private->shift = shift;
private->adjustment = gtk_adjustment_new (pika_memsize_entry_get_rounded_value (entry,
private->value),
CAST (lower >> shift),
CAST (upper >> shift),
1, 8, 0);
private->spinbutton = pika_spin_button_new (private->adjustment, 1.0, 0);
gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (private->spinbutton), TRUE);
#undef CAST
gtk_entry_set_width_chars (GTK_ENTRY (private->spinbutton), 7);
gtk_box_pack_start (GTK_BOX (entry), private->spinbutton, FALSE, FALSE, 0);
gtk_widget_show (private->spinbutton);
g_signal_connect (private->adjustment, "value-changed",
G_CALLBACK (pika_memsize_entry_adj_callback),
entry);
private->menu = pika_int_combo_box_new (_("Kibibyte"), 10,
_("Mebibyte"), 20,
_("Gibibyte"), 30,
NULL);
pika_int_combo_box_set_active (PIKA_INT_COMBO_BOX (private->menu), shift);
g_signal_connect (private->menu, "changed",
G_CALLBACK (pika_memsize_entry_unit_callback),
entry);
gtk_box_pack_start (GTK_BOX (entry), private->menu, FALSE, FALSE, 0);
gtk_widget_show (private->menu);
return GTK_WIDGET (entry);
}
/**
* pika_memsize_entry_set_value:
* @entry: a #PikaMemsizeEntry
* @value: the new value (in Bytes)
*
* Sets the @entry's value. Please note that the #PikaMemsizeEntry rounds
* the value to full Kilobytes.
**/
void
pika_memsize_entry_set_value (PikaMemsizeEntry *entry,
guint64 value)
{
PikaMemsizeEntryPrivate *private;
guint shift;
g_return_if_fail (PIKA_IS_MEMSIZE_ENTRY (entry));
private = GET_PRIVATE (entry);
g_return_if_fail (value >= private->lower && value <= private->upper);
for (shift = 30; shift > 10; shift -= 10)
{
if (value > (G_GUINT64_CONSTANT (1) << shift) &&
value % (G_GUINT64_CONSTANT (1) << shift) == 0)
break;
}
if (shift != private->shift)
pika_int_combo_box_set_active (PIKA_INT_COMBO_BOX (private->menu), shift);
gtk_adjustment_set_value (private->adjustment,
(gdouble) pika_memsize_entry_get_rounded_value (entry, value));
#undef CASE
}
/**
* pika_memsize_entry_get_value:
* @entry: a #PikaMemsizeEntry
*
* Retrieves the current value from a #PikaMemsizeEntry.
*
* Returns: the current value of @entry (in Bytes).
**/
guint64
pika_memsize_entry_get_value (PikaMemsizeEntry *entry)
{
g_return_val_if_fail (PIKA_IS_MEMSIZE_ENTRY (entry), 0);
return GET_PRIVATE (entry)->value;
}
/**
* pika_memsize_entry_get_spinbutton:
* @entry: a #PikaMemsizeEntry
*
* Returns: (transfer none) (type GtkSpinButton): the entry's #GtkSpinbutton.
*
* Since: 3.0
**/
GtkWidget *
pika_memsize_entry_get_spinbutton (PikaMemsizeEntry *entry)
{
g_return_val_if_fail (PIKA_IS_MEMSIZE_ENTRY (entry), 0);
return GET_PRIVATE (entry)->spinbutton;
}