/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* e-selection-model-array.c: a Selection Model
*
* Author:
* Christopher James Lahey <clahey@ximian.com>
*
* (C) 2000, 2001 Ximian, Inc.
*/
#include <config.h>
#include <gtk/gtksignal.h>
#include "e-bit-array.h"
#include "gal/util/e-util.h"
#define EBA_CLASS(e) ((EBitArrayClass *)((GtkObject *)e)->klass)
#define PARENT_TYPE (gtk_object_get_type ())
#define ONES ((guint32) 0xffffffff)
#define BOX(n) ((n) / 32)
#define OFFSET(n) (31 - ((n) % 32))
#define BITMASK(n) ((guint32)(((guint32) 0x1) << OFFSET((n))))
#define BITMASK_LEFT(n) ((((n) % 32) == 0) ? 0 : (ONES << (32 - ((n) % 32))))
#define BITMASK_RIGHT(n) ((guint32)(((guint32) ONES) >> ((n) % 32)))
static GtkObjectClass *parent_class;
static void
e_bit_array_insert_real(EBitArray *eba, int row)
{
int box;
int i;
if(eba->bit_count >= 0) {
/* Add another word if needed. */
if ((eba->bit_count & 0x1f) == 0) {
eba->data = g_renew(gint, eba->data, (eba->bit_count >> 5) + 1);
eba->data[eba->bit_count >> 5] = 0;
}
/* The box is the word that our row is in. */
box = BOX(row);
/* Shift all words to the right of our box right one bit. */
for (i = eba->bit_count >> 5; i > box; i--) {
eba->data[i] = (eba->data[i] >> 1) | (eba->data[i - 1] << 31);
}
/* Shift right half of box one bit to the right. */
eba->data[box] = (eba->data[box] & BITMASK_LEFT(row)) | ((eba->data[box] & BITMASK_RIGHT(row)) >> 1);
eba->bit_count ++;
}
}
static void
e_bit_array_delete_real(EBitArray *eba, int row, gboolean move_selection_mode)
{
int box;
int i;
int last;
int selected = FALSE;
if(eba->bit_count >= 0) {
guint32 bitmask;
box = row >> 5;
last = eba->bit_count >> 5;
/* Build bitmasks for the left and right half of the box */
bitmask = BITMASK_RIGHT(row) >> 1;
if (move_selection_mode)
selected = e_bit_array_value_at(eba, row);
/* Shift right half of box one bit to the left. */
eba->data[box] = (eba->data[box] & BITMASK_LEFT(row))| ((eba->data[box] & bitmask) << 1);
/* Shift all words to the right of our box left one bit. */
if (box < last) {
eba->data[box] &= eba->data[box + 1] >> 31;
for (i = box + 1; i < last; i++) {
eba->data[i] = (eba->data[i] << 1) | (eba->data[i + 1] >> 31);
}
/* this over-runs our memory! */
/*eba->data[i] = eba->data[i] << 1; */
}
eba->bit_count --;
/* Remove the last word if not needed. */
if ((eba->bit_count & 0x1f) == 0) {
eba->data = g_renew(gint, eba->data, eba->bit_count >> 5);
}
if (move_selection_mode && selected) {
e_bit_array_select_single_row (eba, row > 0 ? row - 1 : 0);
}
}
}
/* FIXME : Improve efficiency here. */
void
e_bit_array_delete(EBitArray *eba, int row, int count)
{
int i;
for (i = 0; i < count; i++)
e_bit_array_delete_real(eba, row, FALSE);
}
/* FIXME : Improve efficiency here. */
void
e_bit_array_delete_single_mode(EBitArray *eba, int row, int count)
{
int i;
for (i = 0; i < count; i++)
e_bit_array_delete_real(eba, row, TRUE);
}
/* FIXME : Improve efficiency here. */
void
e_bit_array_insert(EBitArray *eba, int row, int count)
{
int i;
for (i = 0; i < count; i++)
e_bit_array_insert_real(eba, row);
}
/* FIXME: Implement this more efficiently. */
void
e_bit_array_move_row(EBitArray *eba, int old_row, int new_row)
{
e_bit_array_delete_real(eba, old_row, FALSE);
e_bit_array_insert_real(eba, new_row);
}
static void
eba_destroy (GtkObject *object)
{
EBitArray *eba;
eba = E_BIT_ARRAY (object);
g_free(eba->data);
}
/**
* e_selection_model_is_row_selected
* @selection: #EBitArray to check
* @n: The row to check
*
* This routine calculates whether the given row is selected.
*
* Returns: %TRUE if the given row is selected
*/
gboolean
e_bit_array_value_at (EBitArray *eba,
gint n)
{
if (eba->bit_count < n || eba->bit_count == 0)
return 0;
else
return (eba->data[BOX(n)] >> OFFSET(n)) & 0x1;
}
/**
* e_selection_model_foreach
* @selection: #EBitArray to traverse
* @callback: The callback function to call back.
* @closure: The closure
*
* This routine calls the given callback function once for each
* selected row, passing closure as the closure.
*/
void
e_bit_array_foreach (EBitArray *eba,
EForeachFunc callback,
gpointer closure)
{
int i;
int last = (eba->bit_count + 31) / 32;
for (i = 0; i < last; i++) {
if (eba->data[i]) {
int j;
guint32 value = eba->data[i];
for (j = 0; j < 32; j++) {
if (value & 0x80000000) {
callback(i * 32 + j, closure);
}
value <<= 1;
}
}
}
}
/**
* e_selection_model_clear
* @selection: #EBitArray to clear
*
* This routine clears the selection to no rows selected.
*/
void
e_bit_array_clear(EBitArray *eba)
{
g_free(eba->data);
eba->data = NULL;
eba->bit_count = 0;
}
#define PART(x,n) (((x) & (0x01010101 << n)) >> n)
#define SECTION(x, n) (((x) >> (n * 8)) & 0xff)
/**
* e_selection_model_selected_count
* @selection: #EBitArray to count
*
* This routine calculates the number of rows selected.
*
* Returns: The number of rows selected in the given model.
*/
gint
e_bit_array_selected_count (EBitArray *eba)
{
gint count;
int i;
int last;
if (!eba->data)
return 0;
count = 0;
last = BOX(eba->bit_count - 1);
for (i = 0; i <= last; i++) {
int j;
guint32 thiscount = 0;
for (j = 0; j < 8; j++)
thiscount += PART(eba->data[i], j);
for (j = 0; j < 4; j++)
count += SECTION(thiscount, j);
}
return count;
}
/**
* e_selection_model_select_all
* @selection: #EBitArray to select all
*
* This routine selects all the rows in the given
* #EBitArray.
*/
void
e_bit_array_select_all (EBitArray *eba)
{
int i;
if (!eba->data)
eba->data = g_new0 (gint, (eba->bit_count + 31) / 32);
for (i = 0; i < (eba->bit_count + 31) / 32; i ++) {
eba->data[i] = ONES;
}
/* need to zero out the bits corresponding to the rows not
selected in the last full 32 bit mask */
if (eba->bit_count % 32) {
int unselected_mask = 0;
int num_unselected_in_last_byte = 32 - eba->bit_count % 32;
for (i = 0; i < num_unselected_in_last_byte; i ++)
unselected_mask |= 1 << i;
eba->data[(eba->bit_count + 31) / 32 - 1] &= ~unselected_mask;
}
}
/**
* e_selection_model_invert_selection
* @selection: #EBitArray to invert
*
* This routine inverts all the rows in the given
* #EBitArray.
*/
void
e_bit_array_invert_selection (EBitArray *eba)
{
int i;
if (!eba->data)
eba->data = g_new0 (gint, (eba->bit_count + 31) / 32);
for (i = 0; i < (eba->bit_count + 31) / 32; i ++) {
eba->data[i] = ~eba->data[i];
}
}
int
e_bit_array_bit_count (EBitArray *eba)
{
return eba->bit_count;
}
gboolean
e_bit_array_cross_and (EBitArray *eba)
{
int i;
for (i = 0; i < eba->bit_count / 32; i++) {
if (eba->data[i] != ONES)
return FALSE;
}
if ((eba->bit_count % 32) && ((eba->data[i] & BITMASK_LEFT(eba->bit_count)) != BITMASK_LEFT(eba->bit_count)))
return FALSE;
return TRUE;
}
gboolean
e_bit_array_cross_or (EBitArray *eba)
{
int i;
for (i = 0; i < eba->bit_count / 32; i++) {
if (eba->data[i] != 0)
return TRUE;
}
if ((eba->bit_count % 32) && ((eba->data[i] & BITMASK_LEFT(eba->bit_count)) != 0))
return TRUE;
return FALSE;
}
#define OPERATE(object, i,mask,grow) ((grow) ? (((object)->data[(i)]) |= ((guint32) ~(mask))) : (((object)->data[(i)]) &= (mask)))
void
e_bit_array_change_one_row(EBitArray *eba, int row, gboolean grow)
{
int i;
i = BOX(row);
OPERATE(eba, i, ~BITMASK(row), grow);
}
void
e_bit_array_change_range(EBitArray *eba, int start, int end, gboolean grow)
{
int i, last;
if (start != end) {
i = BOX(start);
last = BOX(end);
if (i == last) {
OPERATE(eba, i, BITMASK_LEFT(start) | BITMASK_RIGHT(end), grow);
} else {
OPERATE(eba, i, BITMASK_LEFT(start), grow);
if (grow)
for (i ++; i < last; i++)
eba->data[i] = ONES;
else
for (i ++; i < last; i++)
eba->data[i] = 0;
OPERATE(eba, i, BITMASK_RIGHT(end), grow);
}
}
}
void
e_bit_array_select_single_row (EBitArray *eba, int row)
{
int i;
for (i = 0; i < ((eba->bit_count + 31) / 32); i++) {
if (!((i == BOX(row) && eba->data[i] == BITMASK(row)) ||
(i != BOX(row) && eba->data[i] == 0))) {
g_free(eba->data);
eba->data = g_new0(gint, (eba->bit_count + 31) / 32);
eba->data[BOX(row)] = BITMASK(row);
break;
}
}
}
void
e_bit_array_toggle_single_row (EBitArray *eba, int row)
{
if (eba->data[BOX(row)] & BITMASK(row))
eba->data[BOX(row)] &= ~BITMASK(row);
else
eba->data[BOX(row)] |= BITMASK(row);
}
static void
e_bit_array_init (EBitArray *eba)
{
eba->data = NULL;
eba->bit_count = 0;
}
static void
e_bit_array_class_init (EBitArrayClass *klass)
{
GtkObjectClass *object_class;
parent_class = gtk_type_class (PARENT_TYPE);
object_class = GTK_OBJECT_CLASS(klass);
object_class->destroy = eba_destroy;
}
E_MAKE_TYPE(e_bit_array, "EBitArray", EBitArray,
e_bit_array_class_init, e_bit_array_init, PARENT_TYPE);
EBitArray *
e_bit_array_new (int count)
{
EBitArray *eba = gtk_type_new (e_bit_array_get_type ());
eba->bit_count = count;
eba->data = g_new0(gint, (eba->bit_count + 31) / 32);
return eba;
}
