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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#include <LibGUI/BoxLayout.h>
28#include <LibGUI/StackWidget.h>
29
30namespace GUI {
31
32StackWidget::StackWidget()
33{
34}
35
36StackWidget::~StackWidget()
37{
38}
39
40void StackWidget::set_active_widget(Widget* widget)
41{
42 if (widget == m_active_widget)
43 return;
44
45 if (m_active_widget)
46 m_active_widget->set_visible(false);
47 m_active_widget = widget;
48 if (m_active_widget) {
49 m_active_widget->set_relative_rect(rect());
50 m_active_widget->set_visible(true);
51 }
52 if (on_active_widget_change)
53 on_active_widget_change(m_active_widget);
54}
55
56void StackWidget::resize_event(ResizeEvent& event)
57{
58 if (!m_active_widget)
59 return;
60 m_active_widget->set_relative_rect({ {}, event.size() });
61}
62
63void StackWidget::child_event(Core::ChildEvent& event)
64{
65 if (!event.child() || !Core::is<Widget>(*event.child()))
66 return Widget::child_event(event);
67 auto& child = Core::to<Widget>(*event.child());
68 if (event.type() == Event::ChildAdded) {
69 if (!m_active_widget)
70 set_active_widget(&child);
71 else if (m_active_widget != &child)
72 child.set_visible(false);
73 } else if (event.type() == Event::ChildRemoved) {
74 if (m_active_widget == &child) {
75 Widget* new_active_widget = nullptr;
76 for_each_child_widget([&](auto& new_child) {
77 new_active_widget = &new_child;
78 return IterationDecision::Break;
79 });
80 set_active_widget(new_active_widget);
81 }
82 }
83 Widget::child_event(event);
84}
85
86}