QtSidekickViewer/contentviewwidget.cpp at master · cburwell/QtSidekickViewer · GitHub

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#include "contentviewwidget.h"
#include "commandbarwidget.h"
#include "dndwebengineview.h"

#include <QDragEnterEvent>
#include <QFileInfo>
#include <QHBoxLayout>
#include <QPushButton>
#include <QStringLiteral>
#include <QWebChannel>
#include <QWebEngineProfile>
#include <QWebEngineScript>
#include <QWebEngineScriptCollection>
#include <QWebEngineSettings>

ContentViewWidget::ContentViewWidget(QWidget *parent, std::string id)
    : QWidget{parent}
{
    _id = id;
    lastPos = new QPointF();
    isProgScroll = false;

    // container
    QWidget *containerWidget = new QWidget();

    // command bar widget
    CommandBarWidget *cmdBar = new CommandBarWidget();
    QObject::connect(cmdBar,
                     &CommandBarWidget::newUrlSelected,
                     this,
                     &ContentViewWidget::handleFileOrUrlChange);
    QObject::connect(cmdBar,
                     &CommandBarWidget::newFileSelected,
                     this,
                     &ContentViewWidget::handleFileOrUrlChange);

    // Web view
    webView = new DNDWebEngineView();
    // Set attributes to handle PDFs
    webView->settings()->setAttribute(QWebEngineSettings::PluginsEnabled, true);
    webView->settings()->setAttribute(QWebEngineSettings::FullScreenSupportEnabled, true);
    webView->settings()->setAttribute(QWebEngineSettings::PdfViewerEnabled, true);

    QObject::connect(webView->page(),
                     &QWebEnginePage::loadFinished,
                     this,
                     &ContentViewWidget::updateMaxYPos);

    QObject::connect(webView->page(),
                     &QWebEnginePage::scrollPositionChanged,
                     this,
                     &ContentViewWidget::handleScrollPositionChanged);

    QObject::connect(webView,
                     &DNDWebEngineView::updateCommandStatusText,
                     cmdBar,
                     &CommandBarWidget::setSelectedLabelText);

    // Container layout
    QVBoxLayout *containerLayout = new QVBoxLayout(containerWidget);
    containerLayout->setContentsMargins(0, 0, 0, 0);
    containerLayout->addWidget(cmdBar);
    containerLayout->addWidget(webView);

    setLayout(containerLayout);
}

void ContentViewWidget::updateMaxYPos()
{
    webView->page()->runJavaScript(
        "document.documentElement.scrollHeight - document.documentElement.clientHeight;",
        [this](const QVariant &v) { maxYPos = v.toInt(); });
}

void ContentViewWidget::handleScrollPositionChanged(const QPointF &position)
{
    // TODO: This results in extra overhead every time position is updated, need to figure out alternative in JS land (webchannel possibly)
    updateMaxYPos();

    // Calc delta
    int deltaX = position.x() - lastPos->x();
    int deltaY = position.y() - lastPos->y();

    // Update lastPos
    lastPos->setX(position.x());
    lastPos->setY(position.y());

    // Only emit scroll changes if it was scrolled by user
    if (!isProgScroll)
        emit changedScrollPosition(_id, deltaX, deltaY);
    else
        isProgScroll = false;
}

void ContentViewWidget::setProgScroll(bool isProgScroll)
{
    this->isProgScroll = isProgScroll;
}

void ContentViewWidget::scrollBy(int deltaX, int deltaY)
{
    // Update position, even if out of bounds (keeps track of other view)
    lastPos->setY(lastPos->y() + deltaY);

    // Only scroll if in bounds
    if (lastPos->y() > 0 && lastPos->y() <= maxYPos)
        webView->page()->runJavaScript(QString("window.scrollTo({top:%1});").arg(lastPos->y()));
}

void ContentViewWidget::handleFileOrUrlChange(QString newFileOrUrl)
{
    webView->setUrl(newFileOrUrl);
}