+++ /dev/null
-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-/*
- * color-group.c - Utility to keep a shered memory of custom colors
- * between arbitrary widgets.
- * Copyright 2000, Michael Levy
- * Copyright 2001, Almer S. Tigelaar
- *
- * Authors:
- * Michael Levy (mlevy@genoscope.cns.fr)
- * Revised and polished by:
- * Almer S. Tigelaar <almer@gnome.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License, version 2, as published by the Free Software Foundation.
- *
- * 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
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-
-#include "color-group.h"
-#include <glib-object.h>
-#include <gdk/gdkcolor.h>
-#include "e-util.h"
-#include <string.h>
-
-#define PARENT_TYPE G_TYPE_OBJECT
-
-enum {
- CUSTOM_COLOR_ADD,
- LAST_SIGNAL
-};
-
-static GObjectClass *parent_class;
-
-static GQuark color_group_signals [LAST_SIGNAL] = { 0 };
-
-static void color_group_finalize (GObject *obj);
-
-static void
-color_group_class_init (ColorGroupClass *klass)
-{
- GObjectClass *object_class;
-
- object_class = (GObjectClass*) klass;
-
- object_class->finalize = &color_group_finalize;
- parent_class = g_type_class_peek (PARENT_TYPE);
-
- color_group_signals [CUSTOM_COLOR_ADD] =
- g_signal_new ("custom_color_add",
- COLOR_GROUP_TYPE,
- G_SIGNAL_RUN_LAST,
- G_STRUCT_OFFSET (ColorGroupClass, custom_color_add),
- (GSignalAccumulator) NULL, NULL,
- g_cclosure_marshal_VOID__POINTER,
- G_TYPE_NONE,
- 1, G_TYPE_POINTER);
-}
-
-static void
-color_group_init (ColorGroup *cg)
-{
- cg->name = NULL;
- cg->history = NULL;
- cg->history_size = 0;
-}
-
-E_MAKE_TYPE(color_group,
- "ColorGroup",
- ColorGroup,
- color_group_class_init,
- color_group_init,
- PARENT_TYPE)
-
-
-/* Hash table used to ensure unicity in newly created names*/
-static GHashTable *group_names = NULL;
-
-static guint
-cg_hash (gconstpointer key)
-{
- /* Do NOT use smart type checking it will not work for the tmp_key */
- return g_str_hash (((ColorGroup *)key)->name);
-}
-
-static gint
-cg_cmp (gconstpointer a, gconstpointer b)
-{
- /* Do NOT use smart type checking it will not work for the tmp_key */
- ColorGroup const *cg_a = (ColorGroup *)a;
- ColorGroup const *cg_b = (ColorGroup *)b;
- if (cg_a == cg_b)
- return TRUE;
- if (cg_a->context != cg_b->context)
- return FALSE;
- return g_str_equal (cg_a->name, cg_b->name);
-}
-
-static void
-initialize_group_names (void)
-{
- g_assert (group_names == NULL);
- group_names = g_hash_table_new (cg_hash, cg_cmp);
-}
-
-/**
- * color_group_get :
- * @name :
- * @context :
- *
- * Look up the name/context specific color-group. Return NULL if it is not found.
- * No reference is added if it is found.
- */
-ColorGroup *
-color_group_get (const gchar * name, gpointer context)
-{
- ColorGroup tmp_key;
- gpointer res;
-
- g_assert(group_names);
-
- g_return_val_if_fail(name != NULL, NULL);
-
- tmp_key.name = (char *)name;
- tmp_key.context = context;
- res = g_hash_table_lookup (group_names, &tmp_key);
-
- if (res != NULL)
- return COLOR_GROUP (res);
- else
- return NULL;
-}
-
-static gchar *
-create_unique_name (gpointer context)
-{
- const gchar *prefix = "__cg_autogen_name__";
- static gint latest_suff = 0;
- gchar *new_name;
-
- for(;;latest_suff++) {
- new_name = g_strdup_printf("%s%i", prefix, latest_suff);
- if (color_group_get (new_name, context) == NULL)
- return new_name;
- else
- g_free(new_name);
- }
- g_assert_not_reached();
-}
-
-static void
-color_group_finalize (GObject *obj)
-{
- ColorGroup *cg;
-
- g_return_if_fail(obj != NULL);
- g_return_if_fail(IS_COLOR_GROUP(obj));
- g_assert(group_names != NULL);
-
- cg = COLOR_GROUP (obj);
-
- /* make this name available */
- if (cg->name) {
- g_hash_table_remove (group_names, cg);
- g_free (cg->name);
- cg->name = NULL;
- }
-
- if (cg->history) {
- /* Free the whole colour history */
- while ((int) cg->history->len > 0)
- gdk_color_free ((GdkColor *)
- g_ptr_array_remove_index (cg->history, 0));
- g_ptr_array_free (cg->history, TRUE);
- cg->history = NULL;
- }
-
- if (parent_class->finalize)
- (parent_class->finalize) (obj);
-}
-
-/*
- * color_group_get_history_size:
- * Get the size of the custom color history
- */
-gint
-color_group_get_history_size (ColorGroup *cg)
-{
- g_return_val_if_fail (cg != NULL, 0);
-
- return cg->history_size;
-}
-
-/*
- * Change the size of the custom color history.
- */
-void
-color_group_set_history_size (ColorGroup *cg, gint size)
-{
- g_return_if_fail(cg != NULL);
- g_return_if_fail(size >= 0);
-
- /* Remove excess elements (begin with kicking out the oldest) */
- while ((int) cg->history->len > size)
- gdk_color_free ((GdkColor *) g_ptr_array_remove_index (cg->history, 0));
-}
-
-/*
- * color_group_fetch :
- * @name :
- * @context :
- *
- * if name is NULL or a name not currently in use by another group
- * then a new group is created and returned. If name was NULL
- * then the new group is given a unique name prefixed by "__cg_autogen_name__"
- * (thereby insuring namespace separation).
- * If name was already used by a group then the reference count is
- * incremented and a pointer to the group is returned.
- */
-ColorGroup *
-color_group_fetch (const gchar *name, gpointer context)
-{
- ColorGroup *cg;
- gchar *new_name;
-
- if (group_names == NULL)
- initialize_group_names();
-
- if (name == NULL)
- new_name = create_unique_name (context);
- else
- new_name = g_strdup (name);
-
- cg = color_group_get (new_name, context);
- if (cg != NULL) {
- g_free (new_name);
- g_object_ref (G_OBJECT (cg));
- return cg;
- }
-
- /* Take care of creating the new object */
- cg = g_object_new (color_group_get_type (), NULL);
- g_return_val_if_fail(cg != NULL, NULL);
-
- cg->name = new_name;
- cg->context = context;
-
- /* Create history */
- cg->history = g_ptr_array_new ();
-
- /* FIXME: Why not 8? We never use more then 8 on the palette,
- * maybe we can't free colors while they are still on the palette and
- * need to be sure they are not on it when we free them and thus we
- * make the upper limit twice the size of the number of displayed items
- * (2 * 8) ?
- */
- cg->history_size = 16;
-
- /* lastly register this name */
- g_hash_table_insert (group_names, cg, cg);
-
- return cg;
-}
-
-/*
- * color_group_get_custom_colors:
- * Retrieve all custom colors currently in the history using a callback
- * mechanism. The custom colors will be passed from the oldest to the newest.
- */
-void
-color_group_get_custom_colors (ColorGroup *cg, CbCustomColors callback, gpointer user_data)
-{
- int i;
-
- g_return_if_fail (cg != NULL);
-
- /* Invoke the callback for our full history */
- for (i = 0; i < (int) cg->history->len; i++) {
- GdkColor const * const color = g_ptr_array_index (cg->history, i);
-
- callback (color, user_data);
- }
-}
-
-/*
- * color_group_add_color:
- * Changes the colors. The color to be set should always be a custom
- * color! It has no use adding a color which is already in the default
- * palette.
- */
-void
-color_group_add_color (ColorGroup *cg, GdkColor const * const color)
-{
- int i;
-
- g_return_if_fail(cg != NULL);
- g_return_if_fail(color != NULL); /* Can't be NULL */
-
- /* Let's be smart and see if it's already in our history, no need to add it again*/
- for (i = 0; i < (int) cg->history->len; i++) {
- GdkColor *current = g_ptr_array_index (cg->history, i);
-
- if (gdk_color_equal (color, current))
- return;
- }
-
- /*
- * We make our own private copy of the color passed and put
- * it in the history, this is freed later.
- */
- if (cg->history_size > 0)
- g_ptr_array_add (cg->history, gdk_color_copy (color));
-
- /* Shift out the oldest item if we grow beyond our set size */
- if ((int) cg->history->len > cg->history_size)
- gdk_color_free ((GdkColor *) g_ptr_array_remove_index (cg->history, 0));
-
- /* Tell color-palette's that use this group that
- * a new custom color was added.
- */
- g_signal_emit (G_OBJECT(cg),
- color_group_signals [CUSTOM_COLOR_ADD],
- 0,
- color);
-}
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