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/*
* File: dw_aligned_page.c
*
* Copyright (C) 2002, 2003 Sebastian Geerken <S.Geerken@ping.de>
*
* 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 is an abstract class for horizontical alignment of an vertical
* array of text blocks, e.g. list items (with list item markers of
* different width) and (in the future) table cells aligned at
* characters (e.g. decimal point/comma).
*
* The aligned text blocks are represented by instances of sub-classes
* of DwAlignedPage, which define a value used for alignment
* (e.g. list item marker width), and implement the following two
* methods:
*
* get_value: Returns the value independent of all other
* values.
*
* set_max_value: This method is called to set the actual value,
* calculated from the maximum of all values.
*/
#include "dw_aligned_page.h"
#include "list.h"
static void Dw_aligned_page_class_init (DwAlignedPageClass *klass);
static void Dw_aligned_page_init (DwAlignedPage *aligned_page);
static void Dw_aligned_page_destroy (GtkObject *object);
static gint32 Dw_aligned_page_real_get_value (DwAlignedPage *aligned_page);
static void Dw_aligned_page_real_set_max_value (DwAlignedPage *aligned_page,
gint32 max_value,
gint32 value);
static DwPageClass *parent_class;
/*
* Standard Gtk+ function.
*/
GtkType a_Dw_aligned_page_get_type (void)
{
static GtkType type = 0;
if (!type) {
GtkTypeInfo info = {
"DwAlignedPage",
sizeof (DwAlignedPage),
sizeof (DwAlignedPageClass),
(GtkClassInitFunc) Dw_aligned_page_class_init,
(GtkObjectInitFunc) Dw_aligned_page_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL,
(GtkClassInitFunc) NULL
};
type = gtk_type_unique (DW_TYPE_PAGE, &info);
}
return type;
}
/*
* Standard Gtk+ function.
*/
static void Dw_aligned_page_class_init (DwAlignedPageClass *klass)
{
parent_class = gtk_type_class (DW_TYPE_PAGE);
GTK_OBJECT_CLASS(klass)->destroy = Dw_aligned_page_destroy;
klass->get_value = Dw_aligned_page_real_get_value;
klass->set_max_value = Dw_aligned_page_real_set_max_value;
}
/*
* Standard Gtk+ function.
*/
static void Dw_aligned_page_init (DwAlignedPage *aligned_page)
{
aligned_page->list = NULL;
}
/*
* Standard Gtk+ function.
*/
static void Dw_aligned_page_destroy (GtkObject *object)
{
DwAlignedPage *aligned_page = DW_ALIGNED_PAGE (object);
if (aligned_page->list) {
if (aligned_page->list->refcount == 1) {
/* This is the last page in the array, so the list is removed. */
g_free (aligned_page->list->pages);
g_free (aligned_page->list->values);
g_free (aligned_page->list);
} else {
/* Remove this page from the list. The values are simply set to
NULL and 0. */
aligned_page->list->pages[aligned_page->list_pos] = NULL;
aligned_page->list->values[aligned_page->list_pos] = 0;
aligned_page->list->refcount--;
}
}
GTK_OBJECT_CLASS(parent_class)->destroy (object);
}
/*
* This function should be called by the sub-class to define the
* relations between the aligned pages. ref_page is either NULL (this
* will create a new array), or one page in an other array.
*/
void p_Dw_aligned_page_set_ref_page (DwAlignedPage *aligned_page,
DwAlignedPage *ref_page)
{
DwAlignedPageList *list;
if (ref_page == NULL) {
list = g_new (DwAlignedPageList, 1);
list->num = 0;
list->refcount = 0;
list->pages = NULL;
list->values = NULL;
list->num_pages_max = 4;
list->num_values_max = 4;
list->max_value = 0;
} else
list = ref_page->list;
list->num++;
list->refcount++;
a_List_add (list->pages, list->num, list->num_pages_max);
list->pages[list->num - 1] = aligned_page;
a_List_add (list->values, list->num, list->num_values_max);
list->values[list->num - 1] = 0;
aligned_page->list = list;
aligned_page->list_pos = list->num - 1;
p_Dw_aligned_page_update_value (aligned_page);
}
/*
* This function should be called by the sub-class whenever the
* alignment value changes.
*/
void p_Dw_aligned_page_update_value (DwAlignedPage *aligned_page)
{
DwAlignedPageClass *klass;
int i;
if (aligned_page->list) {
klass = DW_ALIGNED_PAGE_CLASS (GTK_OBJECT(aligned_page)->klass);
aligned_page->list->values[aligned_page->list_pos] =
klass->get_value (aligned_page);
if (aligned_page->list->values[aligned_page->list_pos] >
aligned_page->list->max_value) {
/* New value greater than current maximum -> apply it to others. */
aligned_page->list->max_value =
aligned_page->list->values[aligned_page->list_pos];
for (i = 0; i < aligned_page->list->num; i++)
if (aligned_page->list->pages[i]) {
klass = DW_ALIGNED_PAGE_CLASS
(GTK_OBJECT(aligned_page->list->pages[i])->klass);
klass->set_max_value (aligned_page->list->pages[i],
aligned_page->list->max_value,
aligned_page->list->values[i]);
}
} else {
/* No change, apply old max_value only to this page. */
klass = DW_ALIGNED_PAGE_CLASS (GTK_OBJECT(aligned_page)->klass);
klass->set_max_value (aligned_page, aligned_page->list->max_value,
aligned_page->list->values
[aligned_page->list_pos]);
}
}
}
/*
* Standard implementation of DwAlignedPage::get_value.
*/
static gint32 Dw_aligned_page_real_get_value (DwAlignedPage *aligned_page)
{
g_warning ("DwAlignedPage::get_value not implemented for `%s'",
gtk_type_name (GTK_OBJECT_TYPE (aligned_page)));
return 0;
}
/*
* Standard implementation of DwAlignedPage::set_max_value.
*/
static void Dw_aligned_page_real_set_max_value (DwAlignedPage *aligned_page,
gint32 max_value,
gint32 value)
{
g_warning ("DwAlignedPage::set_max_value not implemented for `%s'",
gtk_type_name (GTK_OBJECT_TYPE (aligned_page)));
}
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