can add html content to the QgsLayoutItem

plot_layout/layouts/layout.py

@@ -1,3 +1,8 @@
+from qgis.PyQt.QtCore import (
+    QUrl,
+    QSize
+)
+
 from qgis.core import (
     QgsLayoutItem,
     QgsLayoutItemRegistry,
@@ -6,41 +11,52 @@ from qgis.core import (
     QgsMessageLog,
     QgsGeometry
 )
-
+from qgis.PyQt.QtWebKitWidgets import QWebPage
 
 ITEM_TYPE = QgsLayoutItemRegistry.PluginItem + 1338
 
 
+class LoggingWebPage(QWebPage):
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+    def javaScriptConsoleMessage(self, message, lineNumber, source):
+        QgsMessageLog.logMessage('{}:{} {}'.format(source, lineNumber, message), 'plot-layout')
+
+
 class PlotLayoutItem(QgsLayoutItem):
 
     def __init__(self, layout):
         super().__init__(layout)
 
+        self.web_page = LoggingWebPage(self)
+        self.web_page.mainFrame().setZoomFactor(30.0)
+        self.html_units_to_layout_units = self.calculate_html_units_to_layout_units()
+
+    def calculate_html_units_to_layout_units(self):
+        if not self.layout():
+            return 1
+
+        return 72
+
     def draw(self, context):
-        #pass
-        #if not self.html_loaded:
+        
+        base_url = QUrl.fromLocalFile(self.layout().project().absoluteFilePath())
+        self.web_page.setViewportSize(QSize(self.rect().width() * self.html_units_to_layout_units,
+                                            self.rect().height() * self.html_units_to_layout_units))
+        self.web_page.mainFrame().setHtml('<b>Hello</b>', base_url)
+ 
+
+        # almost a direct copy from QgsLayoutItemLabel!
         painter = context.renderContext().painter()
         painter.save()
 
-    
-
-    def load_content(self):
-        return 'vjdnvjndjn'
-        #     if not self.layout().renderContext().isPreviewRender():
-        #         # this is NOT safe to do when rendering in the gui (i.e. a preview render), but for exports we have
-        #         # to loop around until the HTML has fully loaded
-        #         while not self.html_loaded:
-        #             QCoreApplication.processEvents()
-
-        # # almost a direct copy from QgsLayoutItemLabel!
-        # painter = context.renderContext().painter()
-        # painter.save()
-
-        # # painter is scaled to dots, so scale back to layout units
-        # painter.scale(context.renderContext().scaleFactor() / self.html_units_to_layout_units,
-        #               context.renderContext().scaleFactor() / self.html_units_to_layout_units)
-        # self.web_page.mainFrame().render(painter)
-        # painter.restore()
+        # painter is scaled to dots, so scale back to layout units
+        painter.scale(context.renderContext().scaleFactor() / self.html_units_to_layout_units,
+                      context.renderContext().scaleFactor() / self.html_units_to_layout_units)
+        self.web_page.mainFrame().render(painter)
+        
 
     def type(self):
         return ITEM_TYPE