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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpmemsizeentry.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 "gimpwidgetstypes.h"
+
+#include "gimpmemsizeentry.h"
+#include "gimpspinbutton.h"
+#include "gimpwidgets.h"
+
+#include "libgimp/libgimp-intl.h"
+
+
+/**
+ * SECTION: gimpmemsizeentry
+ * @title: GimpMemSizeEntry
+ * @short_description: A composite widget to enter a memory size.
+ *
+ * Similar to a #GimpSizeEntry 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 GIMP
+ * preferences dialog.
+ **/
+
+
+enum
+{
+ VALUE_CHANGED,
+ LAST_SIGNAL
+};
+
+
+static void gimp_memsize_entry_finalize (GObject *object);
+
+static void gimp_memsize_entry_adj_callback (GtkAdjustment *adj,
+ GimpMemsizeEntry *entry);
+static void gimp_memsize_entry_unit_callback (GtkWidget *widget,
+ GimpMemsizeEntry *entry);
+
+static guint64 gimp_memsize_entry_get_rounded_value (GimpMemsizeEntry *entry,
+ guint64 value);
+
+G_DEFINE_TYPE (GimpMemsizeEntry, gimp_memsize_entry, GTK_TYPE_BOX)
+
+#define parent_class gimp_memsize_entry_parent_class
+
+static guint gimp_memsize_entry_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_memsize_entry_class_init (GimpMemsizeEntryClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->finalize = gimp_memsize_entry_finalize;
+
+ klass->value_changed = NULL;
+
+ gimp_memsize_entry_signals[VALUE_CHANGED] =
+ g_signal_new ("value-changed",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpMemsizeEntryClass, value_changed),
+ NULL, NULL,
+ g_cclosure_marshal_VOID__VOID,
+ G_TYPE_NONE, 0);
+}
+
+static void
+gimp_memsize_entry_init (GimpMemsizeEntry *entry)
+{
+ gtk_orientable_set_orientation (GTK_ORIENTABLE (entry),
+ GTK_ORIENTATION_HORIZONTAL);
+
+ gtk_box_set_spacing (GTK_BOX (entry), 4);
+
+ entry->value = 0;
+ entry->lower = 0;
+ entry->upper = 0;
+ entry->shift = 0;
+ entry->adjustment = NULL;
+ entry->menu = NULL;
+}
+
+static void
+gimp_memsize_entry_finalize (GObject *object)
+{
+ GimpMemsizeEntry *entry = (GimpMemsizeEntry *) object;
+
+ g_clear_object (&entry->adjustment);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_memsize_entry_adj_callback (GtkAdjustment *adj,
+ GimpMemsizeEntry *entry)
+{
+ guint64 size = gtk_adjustment_get_value (adj);
+
+ if (gimp_memsize_entry_get_rounded_value (entry, entry->value) != size)
+ /* Do not allow losing accuracy if the converted/displayed value
+ * stays the same.
+ */
+ entry->value = size << entry->shift;
+
+ g_signal_emit (entry, gimp_memsize_entry_signals[VALUE_CHANGED], 0);
+}
+
+static void
+gimp_memsize_entry_unit_callback (GtkWidget *widget,
+ GimpMemsizeEntry *entry)
+{
+ guint shift;
+
+ gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (widget), (gint *) &shift);
+
+#if _MSC_VER < 1300
+# define CAST (gint64)
+#else
+# define CAST
+#endif
+
+ if (shift != entry->shift)
+ {
+ entry->shift = shift;
+
+ gtk_adjustment_configure (entry->adjustment,
+ gimp_memsize_entry_get_rounded_value (entry, entry->value),
+ CAST entry->lower >> shift,
+ CAST entry->upper >> shift,
+ gtk_adjustment_get_step_increment (entry->adjustment),
+ gtk_adjustment_get_page_increment (entry->adjustment),
+ gtk_adjustment_get_page_size (entry->adjustment));
+ }
+
+#undef CAST
+}
+
+/**
+ * gimp_memsize_entry_get_rounded_value:
+ * @entry: #GimpMemsizeEntry 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
+gimp_memsize_entry_get_rounded_value (GimpMemsizeEntry *entry,
+ guint64 value)
+{
+ guint64 converted;
+
+#if _MSC_VER < 1300
+# define CAST (gint64)
+#else
+# define CAST
+#endif
+
+ converted = (CAST value >> entry->shift) +
+ ((CAST entry->value >> (entry->shift - 1)) & 1);
+
+#undef CAST
+
+ return converted;
+}
+
+
+/**
+ * gimp_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 #GimpMemsizeEntry 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 #GimpMemsizeEntry.
+ **/
+GtkWidget *
+gimp_memsize_entry_new (guint64 value,
+ guint64 lower,
+ guint64 upper)
+{
+ GimpMemsizeEntry *entry;
+ GtkAdjustment *adj;
+ 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 (GIMP_TYPE_MEMSIZE_ENTRY, NULL);
+
+ for (shift = 30; shift > 10; shift -= 10)
+ {
+ if (value > (G_GUINT64_CONSTANT (1) << shift) &&
+ value % (G_GUINT64_CONSTANT (1) << shift) == 0)
+ break;
+ }
+
+ entry->value = value;
+ entry->lower = lower;
+ entry->upper = upper;
+ entry->shift = shift;
+
+ adj = (GtkAdjustment *) gtk_adjustment_new (gimp_memsize_entry_get_rounded_value (entry,
+ entry->value),
+ CAST (lower >> shift),
+ CAST (upper >> shift),
+ 1, 8, 0);
+
+ entry->spinbutton = gimp_spin_button_new (adj, 1.0, 0);
+ gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (entry->spinbutton), TRUE);
+
+#undef CAST
+
+ entry->adjustment = GTK_ADJUSTMENT (adj);
+ g_object_ref_sink (entry->adjustment);
+
+ gtk_entry_set_width_chars (GTK_ENTRY (entry->spinbutton), 7);
+ gtk_box_pack_start (GTK_BOX (entry), entry->spinbutton, FALSE, FALSE, 0);
+ gtk_widget_show (entry->spinbutton);
+
+ g_signal_connect (entry->adjustment, "value-changed",
+ G_CALLBACK (gimp_memsize_entry_adj_callback),
+ entry);
+
+ entry->menu = gimp_int_combo_box_new (_("Kibibyte"), 10,
+ _("Mebibyte"), 20,
+ _("Gibibyte"), 30,
+ NULL);
+
+ gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (entry->menu), shift);
+
+ g_signal_connect (entry->menu, "changed",
+ G_CALLBACK (gimp_memsize_entry_unit_callback),
+ entry);
+
+ gtk_box_pack_start (GTK_BOX (entry), entry->menu, FALSE, FALSE, 0);
+ gtk_widget_show (entry->menu);
+
+ return GTK_WIDGET (entry);
+}
+
+/**
+ * gimp_memsize_entry_set_value:
+ * @entry: a #GimpMemsizeEntry
+ * @value: the new value (in Bytes)
+ *
+ * Sets the @entry's value. Please note that the #GimpMemsizeEntry rounds
+ * the value to full Kilobytes.
+ **/
+void
+gimp_memsize_entry_set_value (GimpMemsizeEntry *entry,
+ guint64 value)
+{
+ guint shift;
+
+ g_return_if_fail (GIMP_IS_MEMSIZE_ENTRY (entry));
+ g_return_if_fail (value >= entry->lower && value <= entry->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 != entry->shift)
+ gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (entry->menu), shift);
+
+ gtk_adjustment_set_value (entry->adjustment,
+ (gdouble) gimp_memsize_entry_get_rounded_value (entry, value));
+
+#undef CASE
+}
+
+/**
+ * gimp_memsize_entry_get_value:
+ * @entry: a #GimpMemsizeEntry
+ *
+ * Retrieves the current value from a #GimpMemsizeEntry.
+ *
+ * Returns: the current value of @entry (in Bytes).
+ **/
+guint64
+gimp_memsize_entry_get_value (GimpMemsizeEntry *entry)
+{
+ g_return_val_if_fail (GIMP_IS_MEMSIZE_ENTRY (entry), 0);
+
+ return entry->value;
+}
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