112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
#include "CompletionPopup.h"
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#include <QApplication>
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#include <QPainter>
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#include <QScreen>
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#include <QStyledItemDelegate>
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namespace {
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constexpr int DetailRole = Qt::UserRole + 1;
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constexpr int AmbiguousRole = Qt::UserRole + 2;
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class CompletionDelegate : public QStyledItemDelegate {
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public:
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using QStyledItemDelegate::QStyledItemDelegate;
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void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
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{
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QStyleOptionViewItem opt = option;
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initStyleOption(&opt, index);
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const QString display = opt.text;
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opt.text.clear();
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const QWidget *w = opt.widget;
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(w ? w->style() : QApplication::style())->drawControl(QStyle::CE_ItemViewItem, &opt, painter, w);
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const bool selected = opt.state & QStyle::State_Selected;
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const QPalette &pal = opt.palette;
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const QString detail = index.data(DetailRole).toString();
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const bool ambiguous = index.data(AmbiguousRole).toBool();
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painter->save();
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painter->setPen(selected ? pal.highlightedText().color() : pal.text().color());
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QRect r = opt.rect.adjusted(4, 0, -4, 0);
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painter->drawText(r, Qt::AlignVCenter | Qt::AlignLeft, display);
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if (!detail.isEmpty()) {
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const int x = painter->fontMetrics().horizontalAdvance(display) + 12;
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QColor dim = selected ? pal.highlightedText().color() : pal.color(QPalette::Disabled, QPalette::Text);
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painter->setPen(dim);
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if (ambiguous) {
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QFont f = painter->font();
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f.setBold(true);
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painter->setFont(f);
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}
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painter->drawText(r.adjusted(x, 0, 0, 0), Qt::AlignVCenter | Qt::AlignLeft, QStringLiteral("\u2014 ") + detail);
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}
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painter->restore();
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}
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QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override
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{
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QSize s = QStyledItemDelegate::sizeHint(option, index);
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const QFontMetrics fm(option.font);
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s.setWidth(fm.horizontalAdvance(index.data(Qt::DisplayRole).toString())
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+ fm.horizontalAdvance(index.data(DetailRole).toString()) + 40);
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return s;
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}
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};
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} // namespace
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CompletionPopup::CompletionPopup(QWidget *parent)
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: QListWidget(parent)
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{
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setWindowFlags(Qt::ToolTip);
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setAttribute(Qt::WA_ShowWithoutActivating);
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setFocusPolicy(Qt::NoFocus);
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setUniformItemSizes(true);
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setItemDelegate(new CompletionDelegate(this));
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connect(this, &QListWidget::itemClicked, this, [this](QListWidgetItem *item) {
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emit itemAccepted(row(item));
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});
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}
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void CompletionPopup::setItems(const std::vector<EditorCompletionItem> &items)
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{
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clear();
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int width = 150;
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const QFontMetrics fm(font());
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for (const auto &i : items) {
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auto *item = new QListWidgetItem(i.display, this);
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item->setData(DetailRole, i.detail);
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item->setData(AmbiguousRole, i.ambiguous);
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width = std::max(width, fm.horizontalAdvance(i.display) + fm.horizontalAdvance(i.detail) + 50);
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}
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if (!items.empty())
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setCurrentRow(0);
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const int rows = static_cast<int>(std::min<size_t>(items.size(), 10));
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const int rowHeight = fm.height() + 6;
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resize(std::min(width, 600), rows * rowHeight + 2 * frameWidth() + 2);
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}
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void CompletionPopup::moveSelection(int delta)
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{
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const int n = count();
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if (n == 0)
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return;
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int r = QListWidget::currentRow() + delta;
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r = std::clamp(r, 0, n - 1);
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setCurrentRow(r);
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}
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void CompletionPopup::showAt(const QPoint &globalPos)
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{
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QPoint p = globalPos;
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if (auto *screen = QApplication::screenAt(globalPos)) {
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const QRect avail = screen->availableGeometry();
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if (p.x() + width() > avail.right())
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p.setX(std::max(avail.left(), avail.right() - width()));
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}
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move(p);
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show();
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}
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