ghostwriter/src/HtmlPreview.cpp at dev · jackcoolpython/ghostwriter · GitHub

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/***********************************************************************

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <http://www.gnu.org/licenses/>.

***********************************************************************/

#include <QVariant>

#include <QFile>

#include <QTextStream>

#include <QString>

#include <QApplication>

#include <QStack>

#include <QDir>

#include <QDesktopServices>

#include <QtConcurrentRun>

#include <QFuture>

#include <QWebChannel>

#include "HtmlPreview.h"

#include "Exporter.h"

#include "SandboxedWebPage.h"

HtmlPreview::HtmlPreview

(

TextDocument* document,

Exporter* exporter,

QWidget* parent

)

: QWebEngineView(parent), document(document), updateInProgress(false),

updateAgain(false), exporter(exporter)

{

vanillaHtml = "";

baseUrl = "";

livePreviewHtml.setText("");

styleSheetUrl.setText(":/resources/github.css");

this->setPage(new SandboxedWebPage(this));

this->settings()->setDefaultTextEncoding("utf-8");

this->settings()->setAttribute(QWebEngineSettings::LocalContentCanAccessFileUrls, true);

this->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

this->page()->action(QWebEnginePage::Reload)->setVisible(false);

this->page()->action(QWebEnginePage::ReloadAndBypassCache)->setVisible(false);

this->page()->action(QWebEnginePage::OpenLinkInThisWindow)->setVisible(false);

this->page()->action(QWebEnginePage::OpenLinkInNewWindow)->setVisible(false);

this->page()->action(QWebEnginePage::ViewSource)->setVisible(false);

this->page()->action(QWebEnginePage::SavePage)->setVisible(false);

connect(this, SIGNAL(loadFinished(bool)), this, SLOT(onLoadFinished(bool)));

headingTagExp.setPattern("^[Hh][1-6]$");

futureWatcher = new QFutureWatcher<QString>(this);

this->connect(futureWatcher, SIGNAL(finished()), SLOT(onHtmlReady()));

this->connect(document, SIGNAL(filePathChanged()), SLOT(updateBaseDir()));

// Set zoom factor for Chromium browser to account for system DPI settings,

// since Chromium assumes 96 DPI as a fixed resolution.

QWidget* window = QApplication::desktop()->screen();

int horizontalDpi = window->logicalDpiX();

this->setZoomFactor((horizontalDpi / 96.0));

QWebChannel *channel = new QWebChannel(this);

channel->registerObject(QStringLiteral("stylesheeturl"), &styleSheetUrl);

channel->registerObject(QStringLiteral("livepreviewcontent"), &livePreviewHtml);

this->page()->setWebChannel(channel);

this->wrapperHtml =

"<!doctype html>"

"<html lang=\"en\">"

"<meta charset=\"utf-8\">"

"<head>"

" <link id='ghostwriter_css' rel='stylesheet' type='text/css' href='qrc:/resources/github.css' media='all' />"

" <script src=\"qrc:/qtwebchannel/qwebchannel.js\"></script>"

"</head>"

"<body>"

" <div id=\"livepreviewplaceholder\"></div>"

" <script src=\"qrc:/resources/gw.js\"></script>"

" <script>"

" new QWebChannel(qt.webChannelTransport,"

" function(channel) {"

" var styleSheetUrl = channel.objects.stylesheeturl;"

" loadStyleSheet(styleSheetUrl.text);"

" styleSheetUrl.textChanged.connect(loadStyleSheet);"

" var content = channel.objects.livepreviewcontent;"

" updateText(content.text);"

" content.textChanged.connect(updateText);"

" }"

" );"

" </script>"

"</body>"

"</html>";

// Set the base URL and load the preview using wrapperHtml above.

this->updateBaseDir();

}

HtmlPreview::~HtmlPreview()

{

// Wait for thread to finish if in the middle of updating the preview.

futureWatcher->waitForFinished();

}

void HtmlPreview::contextMenuEvent(QContextMenuEvent* event)

{

QMenu* menu = page()->createStandardContextMenu();

menu->popup(event->globalPos());

}

void HtmlPreview::updatePreview()

{

if (updateInProgress)

{

updateAgain = true;

return;

}

if (this->isVisible())

{

// Some markdown processors don't handle empty text very well

// and will err. Thus, only pass in text from the document

// into the markdown processor if the text isn't empty or null.

if (document->isEmpty())

{

this->setHtmlContent("");

}

else if (NULL != exporter)

{

QString text = document->toPlainText();

if (!text.isNull() && !text.isEmpty())

{

updateInProgress = true;

QFuture<QString> future =

QtConcurrent::run

(

this,

&HtmlPreview::exportToHtml,

document->toPlainText(),

exporter

);

futureWatcher->setFuture(future);

}

void HtmlPreview::navigateToHeading(int headingSequenceNumber)

{

this->page()->runJavaScript

(

QString

(

"document.getElementById('livepreviewhnbr%1').scrollIntoView()"

).arg(headingSequenceNumber)

);

}

void HtmlPreview::setHtmlExporter(Exporter* exporter)

{

this->exporter = exporter;

setHtmlContent("");

updatePreview();

}

void HtmlPreview::setStyleSheet(const QString& filePath)

{

// If not an internal resource file, use a URL path from the local file

if (!filePath.startsWith(":") && !filePath.startsWith("qrc:") && !filePath.startsWith("file:"))

{

styleSheetUrl.setText(QUrl::fromLocalFile(filePath).toString());

}

// Ensure "qrc" is in front of local resource file path

else if (filePath.startsWith(":"))

{

styleSheetUrl.setText("qrc" + filePath);

}

else

{

styleSheetUrl.setText(filePath);

}

void HtmlPreview::onHtmlReady()

{

QString html = futureWatcher->result();

// Find where the change occurred since last time, and slip an

// anchor in the location so that we can scroll there.

QString anchoredHtml = "";

QTextStream newHtmlDoc((QString*) &html, QIODevice::ReadOnly);

QTextStream oldHtmlDoc((QString*) &(this->vanillaHtml), QIODevice::ReadOnly);

QTextStream anchoredHtmlDoc(&anchoredHtml, QIODevice::WriteOnly);

bool differenceFound = false;

QString oldLine = oldHtmlDoc.readLine();

QString newLine = newHtmlDoc.readLine();

while (!oldLine.isNull() && !newLine.isNull() && !differenceFound)

{

if (oldLine != newLine)

{

// Found the difference, so insert an anchor point at the

// beginning of the line.

differenceFound = true;

anchoredHtmlDoc << "<a id=\"livepreviewmodifypoint\"></a>";

}

else

{

anchoredHtmlDoc << newLine << "\n";

oldLine = oldHtmlDoc.readLine();

newLine = newHtmlDoc.readLine();

}

// If lines were removed at the end of the new document,

// ensure anchor point is inserted.

if (!differenceFound && !oldLine.isNull() && newLine.isNull())

{

differenceFound = true;

anchoredHtmlDoc << "<a id=\"livepreviewmodifypoint\"></a>";

}

// Put any remaining new HTML data into the

// anchored HTML string.

while (!newLine.isNull())

{

if (!differenceFound)

{

anchoredHtmlDoc << "<a id=\"livepreviewmodifypoint\"></a>";

}

differenceFound = true;

anchoredHtmlDoc << newLine << "\n";

newLine = newHtmlDoc.readLine();

}

if (differenceFound)

{

setHtmlContent(anchoredHtml);

this->vanillaHtml = html;

}

updateInProgress = false;

if (updateAgain)

{

updateAgain = false;

updatePreview();

}

void HtmlPreview::onLoadFinished(bool ok)

{

if (ok)

{

this->page()->runJavaScript("document.documentElement.contentEditable = false;");

}

void HtmlPreview::updateBaseDir()

{

if (!document->getFilePath().isNull() && !document->getFilePath().isEmpty())

{

// Note that a forward slash ("/") is appended to the path to

// ensure it works. If the slash isn't there, then it won't

// recognize the base URL for some reason.

baseUrl =

QUrl::fromLocalFile(QFileInfo(document->getFilePath()).dir().absolutePath()

+ "/").toString();

}

else

{

this->baseUrl = "";

}

this->setHtml(wrapperHtml, baseUrl);

this->updatePreview();

}

QSize HtmlPreview::sizeHint() const

{

return QSize(500, 600);

}

void HtmlPreview::closeEvent(QCloseEvent* event)

{

Q_UNUSED(event);

setHtmlContent("");

vanillaHtml = "";

livePreviewHtml.setText("");

}

void HtmlPreview::setHtmlContent(const QString& html)

{

this->vanillaHtml = html;

this->livePreviewHtml.setText(html);

}

QString HtmlPreview::exportToHtml

(

const QString& text,

Exporter* exporter

) const

{

QString html;

// Enable smart typography for preview, if available for the exporter.

bool smartTypographyEnabled = exporter->getSmartTypographyEnabled();

exporter->setSmartTypographyEnabled(true);

// Export to HTML.

exporter->exportToHtml(text, html);

// Put smart typography setting back to the way it was before

// so that the last setting used during document export is remembered.

exporter->setSmartTypographyEnabled(smartTypographyEnabled);

return html;

}

ghostwriter/src/HtmlPreview.cpp at dev · jackcoolpython/ghostwriter · GitHub

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