94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/*
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* Copyright (C) 2020-2022 Roy Qu (royqh1979@gmail.com)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef QPATCHEDCOMBOBOX_H
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#define QPATCHEDCOMBOBOX_H
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#include <QComboBox>
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#include <QListView>
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#include <QPaintEvent>
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#include <QPainter>
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class QPatchedComboBoxListView : public QListView
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{
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Q_OBJECT
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public:
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QPatchedComboBoxListView(QComboBox *cmb = nullptr) : combo(cmb) {}
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protected:
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void resizeEvent(QResizeEvent *event) override
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{
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resizeContents(viewport()->width(), contentsSize().height());
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QListView::resizeEvent(event);
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}
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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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void initViewItemOption(QStyleOptionViewItem *option) const override
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{
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QListView::initViewItemOption(option);
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option->showDecorationSelected = true;
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}
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#else
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QStyleOptionViewItem viewOptions() const override
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{
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QStyleOptionViewItem option = QListView::viewOptions();
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option.showDecorationSelected = true;
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// if (combo)
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// option.font = combo->font();
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return option;
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}
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#endif
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void paintEvent(QPaintEvent *e) override
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{
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if (combo) {
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QStyleOptionComboBox opt;
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opt.initFrom(combo);
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opt.editable = combo->isEditable();
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if (combo->style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, combo)) {
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//we paint the empty menu area to avoid having blank space that can happen when scrolling
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QStyleOptionMenuItem menuOpt;
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menuOpt.initFrom(this);
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menuOpt.palette = palette();
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menuOpt.state = QStyle::State_None;
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menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
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menuOpt.menuRect = e->rect();
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menuOpt.maxIconWidth = 0;
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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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menuOpt.reservedShortcutWidth = 0;
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#else
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menuOpt.tabWidth = 0;
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#endif
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QPainter p(viewport());
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combo->style()->drawControl(QStyle::CE_MenuEmptyArea, &menuOpt, &p, this);
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}
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}
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QListView::paintEvent(e);
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}
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private:
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QComboBox *combo;
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};
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class QPatchedComboBox : public QComboBox
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{
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Q_OBJECT
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public:
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explicit QPatchedComboBox(QWidget *parent = nullptr);
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};
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#endif // QPATCHEDCOMBOBOX_H
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