openpagesswitcher.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
#include "openpagesswitcher.h"
 
#include "centralwidget.h"
#include "openpagesmodel.h"
#include "openpageswidget.h"
#include "tracer.h"
 
#include <QtCore/QEvent>
 
#include <QtGui/QKeyEvent>
#include <QtWidgets/QVBoxLayout>
 
QT_BEGIN_NAMESPACE
 
const int gWidth = 300;
const int gHeight = 200;
 
OpenPagesSwitcher::OpenPagesSwitcher(OpenPagesModel *model)
    : QFrame(nullptr, Qt::Popup)
    , m_openPagesModel(model)
{
    TRACE_OBJ
    resize(gWidth, gHeight);
 
    m_openPagesWidget = new OpenPagesWidget(m_openPagesModel);
 
    // We disable the frame on this list view and use a QFrame around it instead.
    // This improves the look with QGTKStyle.
#ifndef Q_OS_MACOS
    setFrameStyle(m_openPagesWidget->frameStyle());
#endif
    m_openPagesWidget->setFrameStyle(QFrame::NoFrame);
 
    m_openPagesWidget->allowContextMenu(false);
    m_openPagesWidget->installEventFilter(this);
 
    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->setContentsMargins(QMargins());
    layout->addWidget(m_openPagesWidget);
 
    connect(m_openPagesWidget, &OpenPagesWidget::closePage,
            this, &OpenPagesSwitcher::closePage);
    connect(m_openPagesWidget, &OpenPagesWidget::setCurrentPage,
            this, &OpenPagesSwitcher::setCurrentPage);
}
 
OpenPagesSwitcher::~OpenPagesSwitcher()
{
    TRACE_OBJ
}
 
void OpenPagesSwitcher::gotoNextPage()
{
    TRACE_OBJ
    selectPageUpDown(1);
}
 
void OpenPagesSwitcher::gotoPreviousPage()
{
    TRACE_OBJ
    selectPageUpDown(-1);
}
 
void OpenPagesSwitcher::selectAndHide()
{
    TRACE_OBJ
    setVisible(false);
    emit setCurrentPage(m_openPagesWidget->currentIndex());
}
 
void OpenPagesSwitcher::selectCurrentPage()
{
    TRACE_OBJ
    m_openPagesWidget->selectCurrentPage();
}
 
void OpenPagesSwitcher::setVisible(bool visible)
{
    TRACE_OBJ
    QWidget::setVisible(visible);
    if (visible)
        setFocus();
}
 
void OpenPagesSwitcher::focusInEvent(QFocusEvent *event)
{
    TRACE_OBJ
    Q_UNUSED(event);
    m_openPagesWidget->setFocus();
}
 
bool OpenPagesSwitcher::eventFilter(QObject *object, QEvent *event)
{
    TRACE_OBJ
    if (object == m_openPagesWidget) {
        if (event->type() == QEvent::KeyPress) {
            QKeyEvent *ke = static_cast<QKeyEvent*>(event);
            if (ke->key() == Qt::Key_Escape) {
                setVisible(false);
                return true;
            }
 
            const int key = ke->key();
            if (key == Qt::Key_Return || key == Qt::Key_Enter || key == Qt::Key_Space) {
                emit setCurrentPage(m_openPagesWidget->currentIndex());
                return true;
            }
 
            Qt::KeyboardModifier modifier = Qt::ControlModifier;
#ifdef Q_OS_MACOS
            modifier = Qt::AltModifier;
#endif
            if (key == Qt::Key_Backtab
                && (ke->modifiers() == (modifier | Qt::ShiftModifier)))
                gotoPreviousPage();
            else if (key == Qt::Key_Tab && (ke->modifiers() == modifier))
                gotoNextPage();
        } else if (event->type() == QEvent::KeyRelease) {
            QKeyEvent *ke = static_cast<QKeyEvent*>(event);
            if (ke->modifiers() == 0
               /*HACK this is to overcome some event inconsistencies between platforms*/
               || (ke->modifiers() == Qt::AltModifier
               && (ke->key() == Qt::Key_Alt || ke->key() == -1))) {
                selectAndHide();
            }
        }
    }
    return QWidget::eventFilter(object, event);
}
 
void OpenPagesSwitcher::selectPageUpDown(int summand)
{
    TRACE_OBJ
    const int pageCount = m_openPagesModel->rowCount();
    if (pageCount < 2)
        return;
 
    const QModelIndexList &list = m_openPagesWidget->selectionModel()->selectedIndexes();
    if (list.isEmpty())
        return;
 
    QModelIndex index = list.first();
    if (!index.isValid())
        return;
 
    index = m_openPagesModel->index((index.row() + summand + pageCount) % pageCount, 0);
    if (index.isValid()) {
        m_openPagesWidget->setCurrentIndex(index);
        m_openPagesWidget->scrollTo(index, QAbstractItemView::PositionAtCenter);
    }
}
 
QT_END_NAMESPACE