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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 "QSWidget.h"
28#include <LibGUI/MessageBox.h>
29#include <LibGUI/Painter.h>
30#include <LibGUI/Window.h>
31#include <LibGfx/Bitmap.h>
32#include <LibGfx/Palette.h>
33
34QSWidget::QSWidget()
35{
36 set_fill_with_background_color(false);
37}
38
39QSWidget::~QSWidget()
40{
41}
42
43void QSWidget::relayout()
44{
45 if (m_bitmap.is_null())
46 return;
47
48 float scale_factor = (float)m_scale / 100.0f;
49
50 Gfx::Size new_size;
51 new_size.set_width(m_bitmap->width() * scale_factor);
52 new_size.set_height(m_bitmap->height() * scale_factor);
53 m_bitmap_rect.set_size(new_size);
54
55 Gfx::Point new_location;
56 new_location.set_x((width() / 2) - (new_size.width() / 2) - (m_pan_origin.x() * scale_factor));
57 new_location.set_y((height() / 2) - (new_size.height() / 2) - (m_pan_origin.y() * scale_factor));
58 m_bitmap_rect.set_location(new_location);
59
60 update();
61}
62
63void QSWidget::resize_event(GUI::ResizeEvent& event)
64{
65 relayout();
66 GUI::Widget::resize_event(event);
67}
68
69void QSWidget::paint_event(GUI::PaintEvent& event)
70{
71 GUI::Painter painter(*this);
72 painter.add_clip_rect(event.rect());
73
74 painter.fill_rect_with_checkerboard(rect(), { 8, 8 }, palette().base().darkened(0.9), palette().base());
75
76 if (!m_bitmap.is_null())
77 painter.draw_scaled_bitmap(m_bitmap_rect, *m_bitmap, m_bitmap->rect());
78}
79
80void QSWidget::mousedown_event(GUI::MouseEvent& event)
81{
82 if (event.button() != GUI::MouseButton::Left)
83 return;
84 m_click_position = event.position();
85 m_saved_pan_origin = m_pan_origin;
86}
87
88void QSWidget::mouseup_event(GUI::MouseEvent& event)
89{
90 UNUSED_PARAM(event);
91}
92
93void QSWidget::mousemove_event(GUI::MouseEvent& event)
94{
95 if (!(event.buttons() & GUI::MouseButton::Left))
96 return;
97
98 auto delta = event.position() - m_click_position;
99 float scale_factor = (float)m_scale / 100.0f;
100 m_pan_origin = m_saved_pan_origin.translated(
101 -delta.x() / scale_factor,
102 -delta.y() / scale_factor);
103
104 relayout();
105}
106
107void QSWidget::mousewheel_event(GUI::MouseEvent& event)
108{
109 auto old_scale = m_scale;
110 auto old_scale_factor = (float)m_scale / 100.0f;
111
112 m_scale += -event.wheel_delta() * 10;
113 if (m_scale < 10)
114 m_scale = 10;
115 if (m_scale > 1000)
116 m_scale = 1000;
117
118 auto new_scale_factor = (float)m_scale / 100.0f;
119
120 auto focus_point = Gfx::FloatPoint(
121 m_pan_origin.x() - ((float)event.x() - (float)width() / 2.0) / old_scale_factor,
122 m_pan_origin.y() - ((float)event.y() - (float)height() / 2.0) / old_scale_factor);
123
124 m_pan_origin = Gfx::FloatPoint(
125 focus_point.x() - new_scale_factor / old_scale_factor * (focus_point.x() - m_pan_origin.x()),
126 focus_point.y() - new_scale_factor / old_scale_factor * (focus_point.y() - m_pan_origin.y()));
127
128 relayout();
129
130 if (old_scale != m_scale) {
131 if (on_scale_change)
132 on_scale_change(m_scale);
133 }
134}
135
136void QSWidget::load_from_file(const String& path)
137{
138 auto bitmap = Gfx::Bitmap::load_from_file(path);
139 if (!bitmap) {
140 GUI::MessageBox::show(String::format("Failed to open %s", path.characters()), "Cannot open image", GUI::MessageBox::Type::Error, GUI::MessageBox::InputType::OK, window());
141 return;
142 }
143
144 window()->resize(bitmap->size());
145
146 m_path = path;
147 m_bitmap = bitmap;
148 m_scale = 100;
149 m_pan_origin = { 0, 0 };
150 if (on_scale_change)
151 on_scale_change(m_scale);
152 relayout();
153}
154
155void QSWidget::drop_event(GUI::DropEvent& event)
156{
157 event.accept();
158 if (on_drop)
159 on_drop(event);
160}