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add Buffer::{undo,redo}()

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This commit is contained in:
Josh Holtrop 2017-01-11 22:18:02 -05:00
parent e0615011a3
commit 2057c69585
2 changed files with 33 additions and 0 deletions
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31
src/core/Buffer.cc
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@ -386,3 +386,34 @@ void Buffer::apply_change_unit(const ChangeUnit & change_unit, bool forward)
erase_data(change_unit.buffer_position, change_unit.length);
}
}
void Buffer::undo()
{
if (m_current_change_operation_index != INVALID_CHANGE_OPERATION_INDEX)
{
apply_change_operation(*m_change_operations[m_current_change_operation_index], false);
m_current_change_operation_index = m_change_operations[m_current_change_operation_index]->parent;
}
}
void Buffer::redo()
{
size_t child_index = INVALID_CHANGE_OPERATION_INDEX;
if (m_current_change_operation_index == INVALID_CHANGE_OPERATION_INDEX)
{
if (m_change_operations.size() > 0u)
{
child_index = 0u;
}
}
else
{
child_index = *m_change_operations[m_current_change_operation_index]->children.begin();
}
if (child_index != INVALID_CHANGE_OPERATION_INDEX)
{
apply_change_operation(*m_change_operations[child_index], true);
m_current_change_operation_index = child_index;
}
}

2
src/core/Buffer.h
View File

@ -134,6 +134,8 @@ public:
Iterator end() const { return *m_eof_iterator; }
void push_operation() { m_operation_level++; }
void pop_operation();
void undo();
void redo();
protected:
bool m_eol_at_eof;