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//
// C++ Implementation: undo_redo
//
// Description:
//
//
// Author: Juan Linietsky <reduzio@gmail.com>, (C) 2008
//
// Copyright: See COPYING file that comes with this distribution
//
//
#include "undo_redo.h"
void UndoRedo::_delete_group(Group *p_group, bool p_do, bool p_undo) {
for (List<CommandBase *>::Element *E = p_group->undo_method_list.front(); E; E = E->next()) {
delete E->get();
}
for (List<CommandBase *>::Element *E = p_group->do_method_list.front(); E; E = E->next()) {
delete E->get();
}
if (p_undo) {
for (List<Data *>::Element *E = p_group->undo_data.front(); E; E = E->next()) {
E->get()->free();
}
}
if (p_do) {
for (List<Data *>::Element *E = p_group->do_data.front(); E; E = E->next()) {
E->get()->free();
}
}
delete p_group;
}
void UndoRedo::begin_action(String p_name, bool p_mergeable) {
if (group_rc > 0) {
group_rc++;
return;
}
if (group_list.size() > current_group) {
//delete redo history
for (int i = current_group; i < group_list.size(); i++) {
_delete_group(group_list[i], true, false);
}
group_list.resize(current_group);
}
Group *g = new Group;
g->name = p_name;
group_list.push_back(g);
g->merge_backward = false;
g->merge_forward = false;
if (p_mergeable && current_group > 0 && group_list[current_group - 1]->name == p_name) {
//mergeable command, use previous group, append to it.
group_list[current_group - 1]->merge_forward = true;
g->merge_backward = true;
} else {
}
group_rc++;
if (action_callback) {
action_callback(group_list[current_group]->name, action_callback_userdata);
}
}
void UndoRedo::commit_action() {
ERR_FAIL_COND(group_rc <= 0);
group_rc--;
if (group_rc > 0) {
return;
}
redo();
}
void UndoRedo::undo() {
if (current_group > group_list.size() || current_group == 0)
return;
do {
current_group--;
for (List<CommandBase *>::Element *E = group_list[current_group]->undo_method_list.front(); E; E = E->next()) {
E->get()->call();
}
if (action_callback) {
action_callback(group_list[current_group]->name, action_callback_userdata);
}
} while (current_group > 0 && group_list[current_group]->merge_backward);
}
void UndoRedo::redo() {
if (current_group >= group_list.size())
return;
do {
for (List<CommandBase *>::Element *E = group_list[current_group]->do_method_list.front(); E; E = E->next()) {
E->get()->call();
}
current_group++;
if (action_callback) {
action_callback(group_list[current_group - 1]->name, action_callback_userdata);
}
} while (group_list[current_group - 1]->merge_forward);
}
int UndoRedo::get_current_version() {
return current_group;
}
void UndoRedo::clean() {
for (int i = 0; i < group_list.size(); i++) {
_delete_group(group_list[i], false, true);
}
group_list.clear();
current_group = 0;
group_rc = 0;
}
void UndoRedo::set_action_callback(ActionCallback p_action_callback, void *p_action_callback_userdata) {
action_callback = p_action_callback;
action_callback_userdata = p_action_callback_userdata;
}
UndoRedo::UndoRedo() {
current_group = 0;
group_rc = 0;
action_callback = NULL;
action_callback_userdata = NULL;
}
UndoRedo::~UndoRedo() {
clean();
}
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