blob: 11585e362d46cfb2ded2b0cd73f670f34258bd5c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGUI/Command.h>
#include <LibGUI/UndoStack.h>
namespace GUI {
UndoStack::UndoStack()
{
}
UndoStack::~UndoStack()
{
}
bool UndoStack::can_undo() const
{
return m_stack_index > 0;
}
bool UndoStack::can_redo() const
{
if (m_stack.is_empty())
return false;
return m_stack_index != m_stack.size();
}
void UndoStack::undo()
{
if (!can_undo())
return;
auto& command = m_stack[--m_stack_index];
command.undo();
if (on_state_change)
on_state_change();
}
void UndoStack::redo()
{
if (!can_redo())
return;
auto& command = m_stack[m_stack_index++];
command.redo();
if (on_state_change)
on_state_change();
}
void UndoStack::push(NonnullOwnPtr<Command> command)
{
// If the stack cursor is behind the top of the stack, nuke everything from here to the top.
while (m_stack.size() != m_stack_index)
m_stack.take_last();
if (m_clean_index.has_value() && m_clean_index.value() > m_stack.size())
m_clean_index = {};
if (!m_stack.is_empty() && is_current_modified()) {
if (m_stack.last().merge_with(*command))
return;
}
m_stack.append(move(command));
m_stack_index = m_stack.size();
if (on_state_change)
on_state_change();
}
void UndoStack::set_current_unmodified()
{
if (m_clean_index.has_value() && m_clean_index.value() == m_stack_index)
return;
m_clean_index = m_stack_index;
if (on_state_change)
on_state_change();
}
bool UndoStack::is_current_modified() const
{
if (m_stack.is_empty())
return false;
if (!m_clean_index.has_value())
return true;
if (m_stack_index != m_clean_index.value())
return true;
return false;
}
void UndoStack::clear()
{
if (m_stack.is_empty() && m_stack_index == 0 && !m_clean_index.has_value())
return;
m_stack.clear();
m_stack_index = 0;
m_clean_index.clear();
if (on_state_change)
on_state_change();
}
Optional<String> UndoStack::undo_action_text() const
{
if (!can_undo())
return {};
return m_stack[m_stack_index - 1].action_text();
}
Optional<String> UndoStack::redo_action_text() const
{
if (!can_redo())
return {};
return m_stack[m_stack_index].action_text();
}
}
|
