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comparison src/gui/layouts/flow_layout.cc @ 253:b3549da699a6

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*: ooooh! stupid big commit! oops
author Paper <paper@paper.us.eu.org>
date Tue, 06 Feb 2024 16:56:32 -0500
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252:a0eeb2cc7e6d 253:b3549da699a6
1 /*
2 * Copyright (C) 2016 The Qt Company Ltd.
3 * Contact: https://www.qt.io/licensing/
4 *
5 * This file is part of the QtCore module of the Qt Toolkit.
6 *
7 * "Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 * * Neither the name of The Qt Company Ltd nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
31 */
32 #include "gui/layouts/flow_layout.h"
33
34 #include <QWidget>
35
36 #include <algorithm>
37
38 FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
39 : QLayout(parent), _horiz_space(hSpacing), _vert_space(vSpacing) {
40 setContentsMargins(margin, margin, margin, margin);
41 }
42
43 FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
44 : _horiz_space(hSpacing), _vert_space(vSpacing) {
45 setContentsMargins(margin, margin, margin, margin);
46 }
47
48 FlowLayout::~FlowLayout() {
49 while (count())
50 delete takeAt(0);
51 }
52
53 void FlowLayout::addItem(QLayoutItem *item) {
54 item_list.append(item);
55 }
56
57 int FlowLayout::horizontalSpacing() const {
58 return (_horiz_space >= 0) ? _horiz_space : smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
59 }
60
61 int FlowLayout::verticalSpacing() const {
62 return (_vert_space >= 0) ? _vert_space : smartSpacing(QStyle::PM_LayoutVerticalSpacing);
63 }
64
65 int FlowLayout::count() const {
66 return item_list.size();
67 }
68
69 QLayoutItem* FlowLayout::itemAt(int index) const {
70 return item_list.value(index);
71 }
72
73 QLayoutItem* FlowLayout::takeAt(int index) {
74 return (index >= 0 && index < item_list.size()) ? item_list.takeAt(index) : nullptr;
75 }
76
77 Qt::Orientations FlowLayout::expandingDirections() const
78 {
79 return {};
80 }
81
82 bool FlowLayout::hasHeightForWidth() const {
83 return true;
84 }
85
86 int FlowLayout::heightForWidth(int width) const {
87 return doLayout(QRect(0, 0, width, 0), true);
88 }
89
90 void FlowLayout::setGeometry(const QRect &rect) {
91 QLayout::setGeometry(rect);
92 doLayout(rect, false);
93 }
94
95 QSize FlowLayout::sizeHint() const {
96 return minimumSize();
97 }
98
99 QSize FlowLayout::minimumSize() const {
100 QSize size;
101 for (QLayoutItem* item : item_list)
102 size = size.expandedTo(item->minimumSize());
103
104 const QMargins margins = contentsMargins();
105 size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
106 return size;
107 }
108
109 int FlowLayout::doLayout(const QRect &rect, bool test) const {
110 int left, top, right, bottom;
111 getContentsMargins(&left, &top, &right, &bottom);
112 QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
113
114 int x = effectiveRect.x();
115 int y = effectiveRect.y();
116 int line_height = 0;
117
118 for (QLayoutItem* item : item_list) {
119 const QWidget* wid = item->widget();
120 int horiz_space = horizontalSpacing();
121 if (horiz_space == -1)
122 horiz_space = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
123
124 int vert_space = verticalSpacing();
125 if (vert_space == -1)
126 vert_space = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
127
128 int next_x = x + item->sizeHint().width() + horiz_space;
129 if ((next_x - horiz_space > effectiveRect.right()) && (line_height > 0)) {
130 x = effectiveRect.x();
131 y = y + line_height + vert_space;
132 next_x = x + item->sizeHint().width() + horiz_space;
133 line_height = 0;
134 }
135
136 if (!test)
137 item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
138
139 x = next_x;
140 line_height = std::max(line_height, item->sizeHint().height());
141 }
142
143 return y + line_height - rect.y() + bottom;
144 }
145
146 int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const {
147 QObject *parent = this->parent();
148 if (!parent) {
149 return -1;
150 } else if (parent->isWidgetType()) {
151 QWidget *pw = static_cast<QWidget *>(parent);
152 return pw->style()->pixelMetric(pm, nullptr, pw);
153 } else {
154 return static_cast<QLayout *>(parent)->spacing();
155 }
156 }