jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#pragma once
8
9#include <AK/Badge.h>
10#include <AK/HashTable.h>
11#include <AK/Noncopyable.h>
12#include <AK/TemporaryChange.h>
13#include <AK/Vector.h>
14#include <LibGUI/ModelIndex.h>
15
16namespace GUI {
17
18class ModelSelection {
19 AK_MAKE_NONCOPYABLE(ModelSelection);
20 AK_MAKE_NONMOVABLE(ModelSelection);
21
22public:
23 ModelSelection(AbstractView& view)
24 : m_view(view)
25 {
26 }
27
28 int size() const { return m_indices.size(); }
29 bool is_empty() const { return m_indices.is_empty(); }
30 bool contains(ModelIndex const& index) const { return m_indices.contains(index); }
31 bool contains_row(int row) const
32 {
33 for (auto& index : m_indices) {
34 if (index.row() == row)
35 return true;
36 }
37 return false;
38 }
39
40 void set(ModelIndex const&);
41 void add(ModelIndex const&);
42 void add_all(Vector<ModelIndex> const&);
43 void toggle(ModelIndex const&);
44 bool remove(ModelIndex const&);
45 void clear();
46
47 template<typename Callback>
48 void for_each_index(Callback callback)
49 {
50 for (auto& index : indices())
51 callback(index);
52 }
53
54 template<typename Callback>
55 void for_each_index(Callback callback) const
56 {
57 for (auto& index : indices())
58 callback(index);
59 }
60
61 Vector<ModelIndex> indices() const
62 {
63 Vector<ModelIndex> selected_indices;
64
65 for (auto& index : m_indices)
66 selected_indices.append(index);
67
68 return selected_indices;
69 }
70
71 // FIXME: This doesn't guarantee that what you get is the lowest or "first" index selected..
72 ModelIndex first() const
73 {
74 if (m_indices.is_empty())
75 return {};
76 return *m_indices.begin();
77 }
78
79 void remove_all_matching(Function<bool(ModelIndex const&)> const& filter);
80
81 template<typename Function>
82 void change_from_model(Badge<SortingProxyModel>, Function f)
83 {
84 {
85 TemporaryChange change(m_disable_notify, true);
86 m_notify_pending = false;
87 f(*this);
88 }
89 if (m_notify_pending)
90 notify_selection_changed();
91 }
92
93private:
94 void notify_selection_changed();
95
96 AbstractView& m_view;
97 HashTable<ModelIndex> m_indices;
98 bool m_disable_notify { false };
99 bool m_notify_pending { false };
100};
101
102}