AssetExport: Export line height value in pixels

Task-number: QDS-2597
Change-Id: I96db25b08db55c3107931ab31e4b9342be92e644
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/CMakeLists.txt

@@ -42,7 +42,7 @@ add_qtc_plugin(QmlDesigner
 
 add_qtc_plugin(assetexporterplugin
   CONDITION TARGET QmlDesigner
-  DEPENDS Core ProjectExplorer QmlDesigner Utils Qt5::Qml
+  DEPENDS Core ProjectExplorer QmlDesigner Utils Qt5::Qml Qt5::QuickPrivate
   PUBLIC_INCLUDES assetexporterplugin
   SOURCES
     assetexporterplugin/assetexportdialog.h assetexporterplugin/assetexportdialog.cpp assetexporterplugin/assetexportdialog.ui

src/plugins/qmldesigner/assetexporterplugin/assetexporterplugin.pri

@@ -1,4 +1,5 @@
 QT *= qml quick core widgets
+QT += quick-private
 
 VPATH += $$PWD
 

src/plugins/qmldesigner/assetexporterplugin/assetexporterplugin.qbs

@@ -10,6 +10,12 @@ QtcProduct {
     Depends { name: "ProjectExplorer" }
     Depends { name: "QmlDesigner" }
     Depends { name: "Utils" }
+    Depends {
+        name: "Qt"
+        submodules: [
+            "quick-private"
+        ]
+    }
 
     cpp.includePaths: base.concat([
         "./",

src/plugins/qmldesigner/assetexporterplugin/parsers/textnodeparser.cpp

@@ -28,7 +28,11 @@
 
 #include <QColor>
 #include <QFontInfo>
+#include <QFontMetricsF>
 #include <QHash>
+#include <QtMath>
+
+#include <private/qquicktext_p.h>
 
 namespace  {
 const QHash<QString, QString> AlignMapping{
@@ -86,6 +90,14 @@ QJsonObject TextNodeParser::json(Component &component) const
 
     textDetails.insert(IsMultilineTag, propertyValue("wrapMode").toString().compare("NoWrap") != 0);
 
+    // Calculate line height in pixels
+    QFontMetricsF fm(font);
+    auto lineHeightMode = propertyValue("lineHeightMode").value<QQuickText::LineHeightMode>();
+    double lineHeight = propertyValue("lineHeight").toDouble();
+    qreal lineHeightPx = (lineHeightMode == QQuickText::FixedHeight) ?
+                lineHeight : qCeil(fm.height()) * lineHeight;
+    textDetails.insert(LineHeightTag, lineHeightPx);
+
     QJsonObject metadata = jsonObject.value(MetadataTag).toObject();
     metadata.insert(TextDetailsTag, textDetails);
     jsonObject.insert(MetadataTag, metadata);