Introduce new API for managing devicePixelRatio (#15041)

Issue: #10964

src/webpage.cpp

@@ -30,28 +30,20 @@
 
 #include "webpage.h"
 
-#include <QApplication>
 #include <QBuffer>
-#include <QContextMenuEvent>
-#include <QDateTime>
 #include <QDebug>
 #include <QDesktopServices>
 #include <QDir>
 #include <QFileInfo>
 #include <QImageWriter>
 #include <QKeyEvent>
 #include <QMapIterator>
-#include <QMouseEvent>
 #include <QNetworkAccessManager>
-#include <QNetworkCookie>
-#include <QNetworkProxy>
 #include <QNetworkRequest>
-#include <QPainter>
 #include <QScreen>
 #include <QUrl>
 #include <QUuid>
 #include <QWebElement>
-#include <QWebHistory>
 #include <QWebHistoryItem>
 #include <QWebFrame>
 #include <QWebInspector>
@@ -765,12 +757,11 @@ QVariantMap WebPage::paperSize() const
 
 QVariant WebPage::evaluateJavaScript(const QString& code)
 {
-    QVariant evalResult;
-    QString function = "(" + code + ")()";
+	QString function = "(" + code + ")()";
 
     qDebug() << "WebPage - evaluateJavaScript" << function;
 
-    evalResult = m_currentFrame->evaluateJavaScript(function);
+    QVariant evalResult = m_currentFrame->evaluateJavaScript(function);
 
     qDebug() << "WebPage - evaluateJavaScript result" << evalResult;
 
@@ -1799,4 +1790,14 @@ void WebPage::clearMemoryCache()
     QWebSettings::clearMemoryCaches();
 }
 
+qreal WebPage::devicePixelRatio() const
+{
+    return m_customWebPage->devicePixelRatio();
+}
+
+void WebPage::setDevicePixelRatio(qreal devicePixelRatio)
+{
+    m_customWebPage->setDevicePixelRatio(devicePixelRatio);
+}
+
 #include "webpage.moc"

src/webpage.h

@@ -81,6 +81,7 @@ class WebPage : public QObject
     Q_PROPERTY(int framesCount READ framesCount)
     Q_PROPERTY(QString focusedFrameName READ focusedFrameName)
     Q_PROPERTY(QObject* cookieJar READ cookieJar WRITE setCookieJarFromQObject)
+    Q_PROPERTY(qreal devicePixelRatio READ devicePixelRatio WRITE setDevicePixelRatio)
 
 public:
     WebPage(QObject* parent, const QUrl& baseUrl = QUrl());
@@ -488,6 +489,8 @@ public slots:
     qreal stringToPointSize(const QString&) const;
     qreal printMargin(const QVariantMap&, const QString&);
     qreal getHeight(const QVariantMap&, const QString&) const;
+    qreal devicePixelRatio() const;
+    void setDevicePixelRatio(qreal devicePixelRatio);
 
 signals:
     void initialized();

test/module/webpage/device-pixel-ratio.js

@@ -0,0 +1,14 @@
+const webpage = require('webpage');
+
+test(function () {
+    const page = webpage.create();
+
+    page.devicePixelRatio = 1.5;
+    assert_equals(page.devicePixelRatio, 1.5);
+
+    page.devicePixelRatio = 2.0;
+    assert_equals(page.devicePixelRatio, 2.0);
+
+    page.devicePixelRatio = 0.5;
+    assert_equals(page.devicePixelRatio, 0.5);
+}, "page.devicePixelRatio");