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PIKApp/app/display/pikascalecombobox.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikascalecombobox.c
* Copyright (C) 2004, 2008 Sven Neumann <sven@gimp.org>
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "stdlib.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "gdk/gdkkeysyms.h"
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "display-types.h"
#include "pikascalecombobox.h"
#define MAX_ITEMS 10
enum
{
COLUMN_SCALE,
COLUMN_LABEL,
COLUMN_PERSISTENT,
N_COLUMNS
};
enum
{
ENTRY_ACTIVATED,
LAST_SIGNAL
};
static void pika_scale_combo_box_constructed (GObject *object);
static void pika_scale_combo_box_finalize (GObject *object);
static void pika_scale_combo_box_changed (PikaScaleComboBox *combo_box);
static void pika_scale_combo_box_entry_activate (GtkWidget *entry,
PikaScaleComboBox *combo_box);
static gboolean pika_scale_combo_box_entry_key_press (GtkWidget *entry,
GdkEventKey *event,
PikaScaleComboBox *combo_box);
static void pika_scale_combo_box_scale_iter_set (GtkListStore *store,
GtkTreeIter *iter,
gdouble scale,
gboolean persistent);
G_DEFINE_TYPE (PikaScaleComboBox, pika_scale_combo_box,
GTK_TYPE_COMBO_BOX)
#define parent_class pika_scale_combo_box_parent_class
static guint scale_combo_box_signals[LAST_SIGNAL] = { 0 };
static void
pika_scale_combo_box_class_init (PikaScaleComboBoxClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
scale_combo_box_signals[ENTRY_ACTIVATED] =
g_signal_new ("entry-activated",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaScaleComboBoxClass, entry_activated),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
object_class->constructed = pika_scale_combo_box_constructed;
object_class->finalize = pika_scale_combo_box_finalize;
}
static void
pika_scale_combo_box_init (PikaScaleComboBox *combo_box)
{
combo_box->scale = 1.0;
combo_box->last_path = NULL;
}
static void
pika_scale_combo_box_constructed (GObject *object)
{
PikaScaleComboBox *combo_box = PIKA_SCALE_COMBO_BOX (object);
GtkWidget *entry;
GtkListStore *store;
GtkCellLayout *layout;
GtkCellRenderer *cell;
GtkTreeIter iter;
GtkBorder border = { 0, 0, 0, 0 };
gint i;
G_OBJECT_CLASS (parent_class)->constructed (object);
store = gtk_list_store_new (N_COLUMNS,
G_TYPE_DOUBLE, /* SCALE */
G_TYPE_STRING, /* LABEL */
G_TYPE_BOOLEAN); /* PERSISTENT */
gtk_combo_box_set_model (GTK_COMBO_BOX (combo_box), GTK_TREE_MODEL (store));
g_object_unref (store);
gtk_combo_box_set_entry_text_column (GTK_COMBO_BOX (combo_box),
COLUMN_LABEL);
entry = gtk_bin_get_child (GTK_BIN (combo_box));
gtk_widget_add_events (GTK_WIDGET (entry), GDK_SCROLL_MASK);
g_object_set (entry,
"xalign", 1.0,
"width-chars", 5,
"truncate-multiline", TRUE,
"inner-border", &border,
NULL);
layout = GTK_CELL_LAYOUT (combo_box);
cell = g_object_new (GTK_TYPE_CELL_RENDERER_TEXT,
"xalign", 1.0,
NULL);
gtk_cell_layout_clear (layout);
gtk_cell_layout_pack_start (layout, cell, TRUE);
gtk_cell_layout_set_attributes (layout, cell,
"text", COLUMN_LABEL,
NULL);
for (i = 8; i > 0; i /= 2)
{
gtk_list_store_append (store, &iter);
pika_scale_combo_box_scale_iter_set (store, &iter, i, TRUE);
}
for (i = 2; i <= 8; i *= 2)
{
gtk_list_store_append (store, &iter);
pika_scale_combo_box_scale_iter_set (store, &iter, 1.0 / i, TRUE);
}
g_signal_connect (combo_box, "changed",
G_CALLBACK (pika_scale_combo_box_changed),
NULL);
g_signal_connect (entry, "activate",
G_CALLBACK (pika_scale_combo_box_entry_activate),
combo_box);
g_signal_connect (entry, "key-press-event",
G_CALLBACK (pika_scale_combo_box_entry_key_press),
combo_box);
}
static void
pika_scale_combo_box_finalize (GObject *object)
{
PikaScaleComboBox *combo_box = PIKA_SCALE_COMBO_BOX (object);
if (combo_box->last_path)
{
gtk_tree_path_free (combo_box->last_path);
combo_box->last_path = NULL;
}
if (combo_box->mru)
{
g_list_free_full (combo_box->mru,
(GDestroyNotify) gtk_tree_row_reference_free);
combo_box->mru = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_scale_combo_box_changed (PikaScaleComboBox *combo_box)
{
GtkTreeIter iter;
if (gtk_combo_box_get_active_iter (GTK_COMBO_BOX (combo_box), &iter))
{
GtkTreeModel *model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
gdouble scale;
gtk_tree_model_get (model, &iter,
COLUMN_SCALE, &scale,
-1);
if (scale > 0.0)
{
combo_box->scale = scale;
if (combo_box->last_path)
gtk_tree_path_free (combo_box->last_path);
combo_box->last_path = gtk_tree_model_get_path (model, &iter);
}
}
}
static gboolean
pika_scale_combo_box_parse_text (const gchar *text,
gdouble *scale)
{
gchar *end;
gdouble left_number;
gdouble right_number;
/* try to parse a number */
left_number = strtod (text, &end);
if (end == text)
return FALSE;
else
text = end;
/* skip over whitespace */
while (g_unichar_isspace (g_utf8_get_char (text)))
text = g_utf8_next_char (text);
if (*text == '\0' || *text == '%')
{
*scale = left_number / 100.0;
return TRUE;
}
/* check for a valid separator */
if (*text != '/' && *text != ':')
{
*scale = left_number;
return TRUE;
}
text = g_utf8_next_char (text);
/* skip over whitespace */
while (g_unichar_isspace (g_utf8_get_char (text)))
text = g_utf8_next_char (text);
/* try to parse another number */
right_number = strtod (text, &end);
if (end == text)
return FALSE;
if (right_number == 0.0)
return FALSE;
*scale = left_number / right_number;
return TRUE;
}
static void
pika_scale_combo_box_entry_activate (GtkWidget *entry,
PikaScaleComboBox *combo_box)
{
const gchar *text = gtk_entry_get_text (GTK_ENTRY (entry));
gdouble scale;
if (pika_scale_combo_box_parse_text (text, &scale) &&
scale >= 1.0 / 256.0 &&
scale <= 256.0)
{
pika_scale_combo_box_set_scale (combo_box, scale);
}
else
{
gtk_widget_error_bell (entry);
pika_scale_combo_box_set_scale (combo_box, combo_box->scale);
}
g_signal_emit (combo_box, scale_combo_box_signals[ENTRY_ACTIVATED], 0);
}
static gboolean
pika_scale_combo_box_entry_key_press (GtkWidget *entry,
GdkEventKey *event,
PikaScaleComboBox *combo_box)
{
if (event->keyval == GDK_KEY_Escape)
{
pika_scale_combo_box_set_scale (combo_box, combo_box->scale);
g_signal_emit (combo_box, scale_combo_box_signals[ENTRY_ACTIVATED], 0);
return TRUE;
}
if (event->keyval == GDK_KEY_Tab ||
event->keyval == GDK_KEY_KP_Tab ||
event->keyval == GDK_KEY_ISO_Left_Tab)
{
pika_scale_combo_box_entry_activate (entry, combo_box);
return TRUE;
}
return FALSE;
}
static void
pika_scale_combo_box_scale_iter_set (GtkListStore *store,
GtkTreeIter *iter,
gdouble scale,
gboolean persistent)
{
gchar label[32];
#ifdef G_OS_WIN32
/* use a normal space until pango's windows backend uses harfbuzz,
* see bug #735505
*/
#define PERCENT_SPACE " "
#else
/* use U+2009 THIN SPACE to separate the percent sign from the number */
#define PERCENT_SPACE "\342\200\211"
#endif
if (scale > 1.0)
g_snprintf (label, sizeof (label),
"%d" PERCENT_SPACE "%%", (gint) ROUND (100.0 * scale));
else
g_snprintf (label, sizeof (label),
"%.3g" PERCENT_SPACE "%%", 100.0 * scale);
gtk_list_store_set (store, iter,
COLUMN_SCALE, scale,
COLUMN_LABEL, label,
COLUMN_PERSISTENT, persistent,
-1);
}
static void
pika_scale_combo_box_mru_add (PikaScaleComboBox *combo_box,
GtkTreeIter *iter)
{
GtkTreeModel *model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
GtkTreePath *path = gtk_tree_model_get_path (model, iter);
GList *list;
gboolean found;
for (list = combo_box->mru, found = FALSE; list && !found; list = list->next)
{
GtkTreePath *this = gtk_tree_row_reference_get_path (list->data);
if (gtk_tree_path_compare (this, path) == 0)
{
if (list->prev)
{
combo_box->mru = g_list_remove_link (combo_box->mru, list);
combo_box->mru = g_list_concat (list, combo_box->mru);
}
found = TRUE;
}
gtk_tree_path_free (this);
}
if (! found)
combo_box->mru = g_list_prepend (combo_box->mru,
gtk_tree_row_reference_new (model, path));
gtk_tree_path_free (path);
}
static void
pika_scale_combo_box_mru_remove_last (PikaScaleComboBox *combo_box)
{
GtkTreeModel *model;
GtkTreePath *path;
GList *last;
GtkTreeIter iter;
if (! combo_box->mru)
return;
model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
last = g_list_last (combo_box->mru);
path = gtk_tree_row_reference_get_path (last->data);
if (gtk_tree_model_get_iter (model, &iter, path))
{
gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
gtk_tree_row_reference_free (last->data);
combo_box->mru = g_list_delete_link (combo_box->mru, last);
}
gtk_tree_path_free (path);
}
/**
* pika_scale_combo_box_new:
*
* Returns: a new #PikaScaleComboBox.
**/
GtkWidget *
pika_scale_combo_box_new (void)
{
return g_object_new (PIKA_TYPE_SCALE_COMBO_BOX,
"has-entry", TRUE,
NULL);
}
void
pika_scale_combo_box_set_scale (PikaScaleComboBox *combo_box,
gdouble scale)
{
GtkTreeModel *model;
GtkListStore *store;
GtkWidget *entry;
GtkTreeIter iter;
gboolean iter_valid;
gboolean persistent;
gint n_digits;
g_return_if_fail (PIKA_IS_SCALE_COMBO_BOX (combo_box));
g_return_if_fail (scale > 0.0);
model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
store = GTK_LIST_STORE (model);
for (iter_valid = gtk_tree_model_get_iter_first (model, &iter);
iter_valid;
iter_valid = gtk_tree_model_iter_next (model, &iter))
{
gdouble this;
gtk_tree_model_get (model, &iter,
COLUMN_SCALE, &this,
-1);
if (fabs (this - scale) < 0.0001)
break;
}
if (! iter_valid)
{
GtkTreeIter sibling;
for (iter_valid = gtk_tree_model_get_iter_first (model, &sibling);
iter_valid;
iter_valid = gtk_tree_model_iter_next (model, &sibling))
{
gdouble this;
gtk_tree_model_get (model, &sibling,
COLUMN_SCALE, &this,
-1);
if (this < scale)
break;
}
gtk_list_store_insert_before (store, &iter, iter_valid ? &sibling : NULL);
pika_scale_combo_box_scale_iter_set (store, &iter, scale, FALSE);
}
gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo_box), &iter);
gtk_tree_model_get (model, &iter,
COLUMN_PERSISTENT, &persistent,
-1);
if (! persistent)
{
pika_scale_combo_box_mru_add (combo_box, &iter);
if (gtk_tree_model_iter_n_children (model, NULL) > MAX_ITEMS)
pika_scale_combo_box_mru_remove_last (combo_box);
}
/* Update entry size appropriately. */
entry = gtk_bin_get_child (GTK_BIN (combo_box));
n_digits = (gint) floor (log10 (scale) + 1);
g_object_set (entry,
"width-chars", MAX (5, n_digits + 4),
NULL);
}
gdouble
pika_scale_combo_box_get_scale (PikaScaleComboBox *combo_box)
{
g_return_val_if_fail (PIKA_IS_SCALE_COMBO_BOX (combo_box), 1.0);
return combo_box->scale;
}
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