1 | // Copyright (C) 2020 The Qt Company Ltd. |
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | |
4 | #include "qoptionswidget_p.h" |
5 | |
6 | #include <QtWidgets/qitemdelegate.h> |
7 | #include <QtWidgets/qlayout.h> |
8 | #include <QtWidgets/qlistwidget.h> |
9 | |
10 | QT_BEGIN_NAMESPACE |
11 | |
12 | using namespace Qt::StringLiterals; |
13 | |
14 | class ListWidgetDelegate : public QItemDelegate |
15 | { |
16 | public: |
17 | ListWidgetDelegate(QWidget *w) : QItemDelegate(w), m_widget(w) {} |
18 | |
19 | static bool isSeparator(const QModelIndex &index) { |
20 | return index.data(arole: Qt::AccessibleDescriptionRole).toString() == "separator"_L1 ; |
21 | } |
22 | static void setSeparator(QListWidgetItem *item) { |
23 | item->setData(role: Qt::AccessibleDescriptionRole, value: QString::fromLatin1(ba: "separator" )); |
24 | item->setFlags(item->flags() & ~(Qt::ItemIsSelectable|Qt::ItemIsEnabled)); |
25 | } |
26 | |
27 | protected: |
28 | void paint(QPainter *painter, const QStyleOptionViewItem &option, |
29 | const QModelIndex &index) const override |
30 | { |
31 | if (isSeparator(index)) { |
32 | QRect rect = option.rect; |
33 | if (const QAbstractItemView *view = qobject_cast<const QAbstractItemView*>(object: option.widget)) |
34 | rect.setWidth(view->viewport()->width()); |
35 | QStyleOption opt; |
36 | opt.rect = rect; |
37 | m_widget->style()->drawPrimitive(pe: QStyle::PE_IndicatorToolBarSeparator, opt: &opt, p: painter, |
38 | w: m_widget); |
39 | } else { |
40 | QItemDelegate::paint(painter, option, index); |
41 | } |
42 | } |
43 | |
44 | QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override |
45 | { |
46 | if (isSeparator(index)) { |
47 | int pm = m_widget->style()->pixelMetric(metric: QStyle::PM_DefaultFrameWidth, option: nullptr, widget: m_widget); |
48 | return {pm, pm}; |
49 | } |
50 | return QItemDelegate::sizeHint(option, index); |
51 | } |
52 | |
53 | private: |
54 | QWidget *m_widget; |
55 | }; |
56 | |
57 | static QStringList subtract(const QStringList &minuend, const QStringList &subtrahend) |
58 | { |
59 | QStringList result = minuend; |
60 | for (const QString &str : subtrahend) |
61 | result.removeOne(t: str); |
62 | return result; |
63 | } |
64 | |
65 | QOptionsWidget::QOptionsWidget(QWidget *parent) |
66 | : QWidget(parent) |
67 | , m_noOptionText(tr(s: "No Option" )) |
68 | , m_invalidOptionText(tr(s: "Invalid Option" )) |
69 | { |
70 | m_listWidget = new QListWidget(this); |
71 | m_listWidget->setItemDelegate(new ListWidgetDelegate(m_listWidget)); |
72 | QVBoxLayout *layout = new QVBoxLayout(this); |
73 | layout->addWidget(m_listWidget); |
74 | layout->setContentsMargins({}); |
75 | connect(sender: m_listWidget, signal: &QListWidget::itemChanged, context: this, slot: &QOptionsWidget::itemChanged); |
76 | } |
77 | |
78 | void QOptionsWidget::setOptions(const QStringList &validOptions, const QStringList &selectedOptions) |
79 | { |
80 | m_listWidget->clear(); |
81 | m_optionToItem.clear(); |
82 | m_itemToOption.clear(); |
83 | |
84 | m_validOptions = validOptions; |
85 | m_validOptions.removeDuplicates(); |
86 | std::sort(first: m_validOptions.begin(), last: m_validOptions.end()); |
87 | |
88 | m_selectedOptions = selectedOptions; |
89 | m_selectedOptions.removeDuplicates(); |
90 | std::sort(first: m_selectedOptions.begin(), last: m_selectedOptions.end()); |
91 | |
92 | m_invalidOptions = subtract(minuend: m_selectedOptions, subtrahend: m_validOptions); |
93 | const QStringList validSelectedOptions = subtract(minuend: m_selectedOptions, subtrahend: m_invalidOptions); |
94 | const QStringList validUnselectedOptions = subtract(minuend: m_validOptions, subtrahend: m_selectedOptions); |
95 | |
96 | for (const QString &option : validSelectedOptions) |
97 | appendItem(optionName: option, valid: true, selected: true); |
98 | |
99 | for (const QString &option : m_invalidOptions) |
100 | appendItem(optionName: option, valid: false, selected: true); |
101 | |
102 | if ((validSelectedOptions.size() + m_invalidOptions.size()) && validUnselectedOptions.size()) |
103 | appendSeparator(); |
104 | |
105 | for (const QString &option : validUnselectedOptions) { |
106 | appendItem(optionName: option, valid: true, selected: false); |
107 | if (option.isEmpty() && validUnselectedOptions.size() > 1) // special No Option item |
108 | appendSeparator(); |
109 | } |
110 | } |
111 | |
112 | void QOptionsWidget::setNoOptionText(const QString &text) |
113 | { |
114 | if (m_noOptionText == text) |
115 | return; |
116 | |
117 | m_noOptionText = text; |
118 | |
119 | // update GUI |
120 | const auto itEnd = m_optionToItem.constEnd(); |
121 | for (auto it = m_optionToItem.constBegin(); it != itEnd; ++it) { |
122 | const QString optionName = it.key(); |
123 | if (optionName.isEmpty()) |
124 | it.value()->setText(optionText(optionName, valid: m_validOptions.contains(str: optionName))); |
125 | } |
126 | } |
127 | |
128 | void QOptionsWidget::setInvalidOptionText(const QString &text) |
129 | { |
130 | if (m_invalidOptionText == text) |
131 | return; |
132 | |
133 | m_invalidOptionText = text; |
134 | |
135 | // update GUI |
136 | for (const QString &option : m_invalidOptions) |
137 | m_optionToItem.value(key: option)->setText(optionText(optionName: option, valid: false)); |
138 | } |
139 | |
140 | QString QOptionsWidget::optionText(const QString &optionName, bool valid) const |
141 | { |
142 | QString text = optionName; |
143 | if (optionName.isEmpty()) |
144 | text = u'[' + m_noOptionText + u']'; |
145 | if (!valid) |
146 | text += "\t["_L1 + m_invalidOptionText + u']'; |
147 | return text; |
148 | } |
149 | |
150 | QListWidgetItem *QOptionsWidget::appendItem(const QString &optionName, bool valid, bool selected) |
151 | { |
152 | QListWidgetItem *optionItem = new QListWidgetItem(optionText(optionName, valid), m_listWidget); |
153 | optionItem->setCheckState(selected ? Qt::Checked : Qt::Unchecked); |
154 | m_listWidget->addItem(aitem: optionItem); |
155 | m_optionToItem[optionName] = optionItem; |
156 | m_itemToOption[optionItem] = optionName; |
157 | return optionItem; |
158 | } |
159 | |
160 | void QOptionsWidget::appendSeparator() |
161 | { |
162 | QListWidgetItem *separatorItem = new QListWidgetItem(m_listWidget); |
163 | ListWidgetDelegate::setSeparator(separatorItem); |
164 | m_listWidget->addItem(aitem: separatorItem); |
165 | } |
166 | |
167 | void QOptionsWidget::itemChanged(QListWidgetItem *item) |
168 | { |
169 | const auto it = m_itemToOption.constFind(key: item); |
170 | if (it == m_itemToOption.constEnd()) |
171 | return; |
172 | |
173 | const QString option = *it; |
174 | |
175 | if (item->checkState() == Qt::Checked && !m_selectedOptions.contains(str: option)) { |
176 | m_selectedOptions.append(t: option); |
177 | std::sort(first: m_selectedOptions.begin(), last: m_selectedOptions.end()); |
178 | } else if (item->checkState() == Qt::Unchecked && m_selectedOptions.contains(str: option)) { |
179 | m_selectedOptions.removeOne(t: option); |
180 | } else { |
181 | return; |
182 | } |
183 | emit optionSelectionChanged(options: m_selectedOptions); |
184 | } |
185 | |
186 | QT_END_NAMESPACE |
187 | |