jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <LibGUI/Model.h>
30#include <LibGUI/TextBox.h>
31#include <LibGUI/Widget.h>
32
33namespace GUI {
34
35class ModelEditingDelegate {
36public:
37 virtual ~ModelEditingDelegate() {}
38
39 void bind(Model& model, const ModelIndex& index)
40 {
41 if (m_model.ptr() == &model && m_index == index)
42 return;
43 m_model = model;
44 m_index = index;
45 m_widget = create_widget();
46 }
47
48 Widget* widget() { return m_widget; }
49 const Widget* widget() const { return m_widget; }
50
51 Function<void()> on_commit;
52
53 virtual Variant value() const = 0;
54 virtual void set_value(const Variant&) = 0;
55
56 virtual void will_begin_editing() {}
57
58protected:
59 ModelEditingDelegate() {}
60
61 virtual RefPtr<Widget> create_widget() = 0;
62 void commit()
63 {
64 if (on_commit)
65 on_commit();
66 }
67
68private:
69 RefPtr<Model> m_model;
70 ModelIndex m_index;
71 RefPtr<Widget> m_widget;
72};
73
74class StringModelEditingDelegate : public ModelEditingDelegate {
75public:
76 StringModelEditingDelegate() {}
77 virtual ~StringModelEditingDelegate() override {}
78
79 virtual RefPtr<Widget> create_widget() override
80 {
81 auto textbox = TextBox::construct();
82 textbox->on_return_pressed = [this] {
83 commit();
84 };
85 return textbox;
86 }
87 virtual Variant value() const override { return static_cast<const TextBox*>(widget())->text(); }
88 virtual void set_value(const Variant& value) override { static_cast<TextBox*>(widget())->set_text(value.to_string()); }
89};
90
91}