File indexing completed on 2024-05-12 05:03:13

 /*
    SPDX-FileCopyrightText: 2020 David Faure <faure@kde.org>
 
    SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "completionlistview.h"
 
 #include <QApplication>
 #include <QDebug>
 #include <QKeyEvent>
 #include <QScreen>
 #include <QScrollBar>
 
 CompletionListView::CompletionListView()
     : QListView()
 {
     setUniformItemSizes(true);
     setWindowFlag(Qt::Popup);
     hide();
 
     connect(this, &QListView::clicked, this, &CompletionListView::complete);
 }
 
 CompletionListView::~CompletionListView() = default;
 
 void CompletionListView::setTextWidget(QWidget *textWidget)
 {
     mTextWidget = textWidget;
     const Qt::FocusPolicy origPolicy = textWidget->focusPolicy();
     setFocusPolicy(Qt::NoFocus);
     textWidget->setFocusPolicy(origPolicy);
     setFocusProxy(textWidget);
 }
 
 // Typically called with one of the 3 models returned by InputTextManager:
 // inputCompleterModel() for users and channels, emojiCompleterModel(), or commandModel()
 void CompletionListView::setModel(QAbstractItemModel *model)
 {
     QAbstractItemModel *oldModel = QListView::model();
     if (model != oldModel) {
         if (oldModel) {
             disconnect(oldModel, &QAbstractItemModel::rowsInserted, this, &CompletionListView::slotCompletionAvailable);
             disconnect(oldModel, &QAbstractItemModel::rowsRemoved, this, &CompletionListView::slotCompletionAvailable);
         }
         connect(model, &QAbstractItemModel::rowsInserted, this, &CompletionListView::slotCompletionAvailable);
         connect(model, &QAbstractItemModel::rowsRemoved, this, &CompletionListView::slotCompletionAvailable);
         QListView::setModel(model);
     }
 }
 
 void CompletionListView::keyPressEvent(QKeyEvent *event)
 {
     const int key = event->key();
     if (key == Qt::Key_Escape) {
         hide();
         event->accept();
         return;
     } else if (key == Qt::Key_Return || key == Qt::Key_Enter) {
         Q_EMIT complete(currentIndex());
         event->accept();
         return;
     } else if (key != Qt::Key_Down && key != Qt::Key_Up && key != Qt::Key_PageDown && key != Qt::Key_PageUp && key != Qt::Key_Home && key != Qt::Key_End
                && key != Qt::Key_Left && key != Qt::Key_Right) {
         // send keypresses to the linedit
         qApp->sendEvent(mTextWidget, event);
         return;
     }
 
     QListView::keyPressEvent(event);
 }
 
 bool CompletionListView::event(QEvent *event)
 {
     // QAbstractScrollArea::event doesn't call QWidget::mousePressEvent, which leads to
     // https://bugs.kde.org/show_bug.cgi?id=434473 when making the scrollarea a Qt::Popup
     if (event->type() == QEvent::MouseButtonPress) {
         QWidget::mousePressEvent(static_cast<QMouseEvent *>(event));
     }
     return QListView::event(event);
 }
 
 void CompletionListView::slotCompletionAvailable()
 {
     const int rowCount = model()->rowCount();
     if (rowCount == 0) {
         hide();
         return;
     }
     const int maxVisibleItems = 15;
 
     // Not entirely unlike QCompletionPrivate::showPopup
     const QRect screenRect = mTextWidget->screen()->availableGeometry();
     int h = (sizeHintForRow(0) * qMin(maxVisibleItems, rowCount) + 3) + 3;
     QScrollBar *hsb = horizontalScrollBar();
     if (hsb && hsb->isVisible()) {
         h += horizontalScrollBar()->sizeHint().height();
     }
 
     const int rh = mTextWidget->height();
     QPoint pos = mTextWidget->mapToGlobal(QPoint(0, rh - 2));
     int w = mTextWidget->width();
 
     if (w > screenRect.width()) {
         w = screenRect.width();
     }
     if ((pos.x() + w) > (screenRect.x() + screenRect.width())) {
         pos.setX(screenRect.x() + screenRect.width() - w);
     }
     if (pos.x() < screenRect.x()) {
         pos.setX(screenRect.x());
     }
 
     int top = pos.y() - rh - screenRect.top() + 2;
     int bottom = screenRect.bottom() - pos.y();
     h = qMax(h, minimumHeight());
     if (h > bottom) {
         h = qMin(qMax(top, bottom), h);
 
         if (top > bottom) {
             pos.setY(pos.y() - h - rh + 2);
         }
     }
 
     // qDebug() << "showing at" << pos << "size" << w << "x" << h;
     setGeometry(pos.x(), pos.y(), w, h);
 
     if (!isVisible()) {
         if (!currentIndex().isValid()) {
             setCurrentIndex(model()->index(0, 0));
         }
         show();
     }
 }
 
 #include "moc_completionlistview.cpp"