canvas/report: Use QtWebEngine if available

Author: ales-erjavec

Orange/canvas/report/owreport.py

@@ -1,18 +1,21 @@
 import os
 import pkg_resources
 import pickle
+import textwrap
+import warnings
 from enum import IntEnum
 
-from AnyQt.QtCore import Qt, pyqtSlot
+from AnyQt.QtCore import Qt, QObject, QFile, QTimer, QUrl, pyqtSlot, QT_VERSION
 from AnyQt.QtGui import QIcon, QCursor, QStandardItemModel, QStandardItem
 from AnyQt.QtWidgets import (
-    QApplication, QDialog, QFileDialog, QTableView, QHeaderView
+    QApplication, QDialog, QFileDialog, QTableView, QHeaderView, QSizePolicy
 )
 from AnyQt.QtPrintSupport import QPrinter, QPrintDialog
 
 from Orange.widgets import gui
 from Orange.widgets.widget import OWWidget
 from Orange.widgets.settings import Setting
+from Orange.widgets.utils import webview
 from Orange.canvas.application.canvasmain import CanvasMainWindow
 from Orange.canvas.gui.utils import message_critical
 
@@ -151,7 +154,31 @@ def _setup_ui_(self):
         self.print_button = gui.button(
             box, self, "Print", callback=self._print_report
         )
-        self.report_view = gui.WebviewWidget(self.mainArea, bridge=self)
+
+        class PyBridge(QObject):
+            @pyqtSlot(str)
+            def _select_item(myself, item_id):
+                item = self.table_model.get_item_by_id(item_id)
+                self.table.selectRow(self.table_model.indexFromItem(item).row())
+                self._change_selected_item(item)
+
+            @pyqtSlot(str, str)
+            def _add_comment(myself, item_id, value):
+                item = self.table_model.get_item_by_id(item_id)
+                item.comment = value
+
+        if webview.HAVE_WEBENGINE:
+            viewclass = webview.WebEngineView
+        else:
+            viewclass = webview.WebKitView
+
+        self.report_view = viewclass(
+            self.mainArea, bridge=PyBridge(self),
+            contextMenuPolicy=Qt.NoContextMenu,
+            sizePolicy=QSizePolicy(QSizePolicy.Expanding,
+                                   QSizePolicy.Expanding)
+        )
+        self.mainArea.layout().addWidget(self.report_view)
 
     def __getstate__(self):
         rep_dict = self.__dict__.copy()
@@ -217,24 +244,26 @@ def _build_html(self):
         self.report_view.setHtml(html)
 
     def _scroll_to_item(self, item):
-        self.report_view.evalJS("document.getElementById('{}')."
-                                "scrollIntoView();".format(item.id))
+        self.report_view.runJavaScript(
+            "document.getElementById('{}').scrollIntoView();".format(item.id)
+        )
 
     def _change_selected_item(self, item):
-        self.report_view.evalJS(
-            "var sel_el = document.getElementsByClassName('selected')[0]; "
-            "if (sel_el.id != {}) "
-            "   sel_el.className = 'normal';".format(item.id))
-        self.report_view.evalJS("document.getElementById('{}')."
-                                "className = 'selected';".format(item.id))
-
-    @pyqtSlot(str)
+        self.report_view.runJavaScript(
+            "var sel_el = document.getElementsByClassName('selected')[0];\n"
+            "if (sel_el.id != '{}') {{\n"
+            "   sel_el.className = 'normal';\n"
+            "}}".format(item.id))
+        self.report_view.runJavaScript(
+            "document.getElementById('{}').className = 'selected';"
+            .format(item.id)
+        )
+
     def _select_item(self, item_id):
         item = self.table_model.get_item_by_id(item_id)
         self.table.selectRow(self.table_model.indexFromItem(item).row())
         self._change_selected_item(item)
 
-    @pyqtSlot(str, str)
     def _add_comment(self, item_id, value):
         item = self.table_model.get_item_by_id(item_id)
         item.comment = value
@@ -284,9 +313,16 @@ def _save_report(self):
             with open(filename, 'wb') as f:
                 pickle.dump(self, f)
         else:
-            frame = self.report_view.page().currentFrame()
-            with open(filename, "w") as f:
-                f.write(frame.documentElement().toInnerXml())
+            page = self.report_view.page()
+
+            def save_html(contents):
+                with open(filename, "w") as f:
+                    f.write(contents)
+
+            if webview.HAVE_WEBENGINE:
+                page.toHtml(save_html)
+            else:
+                save_html(page.mainFrame().toHtml())
 
     def _print_report(self):
         printer = QPrinter()