widgets/gui: Handle missing QtWebKitWidgets

Author: ales-erjavec

Orange/widgets/gui.py

@@ -7,14 +7,19 @@
 import pkg_resources
 import numpy
 
-from AnyQt import QtWidgets, QtCore, QtGui, QtWebKitWidgets
+from AnyQt import QtWidgets, QtCore, QtGui
 from AnyQt.QtCore import Qt, Signal, Slot
 from AnyQt.QtGui import QCursor
 from AnyQt.QtWidgets import (
     QApplication, QStyle, QSizePolicy, QWidget, QLabel, QGroupBox, QSlider,
     QComboBox, QLineEdit, QVBoxLayout, QHBoxLayout,
     QTableWidget, QTableWidgetItem, QItemDelegate, QStyledItemDelegate
 )
+try:
+    from AnyQt.QtWebKitWidgets import QWebView
+    HAVE_WEBKIT = True
+except ImportError:
+    HAVE_WEBKIT = False
 
 import Orange.data
 from Orange.widgets.utils import getdeepattr
@@ -217,54 +222,62 @@ def deselectRowsWhere(self, col, value, n_hits=-1,
         return self.selectRowsWhere(col, value, n_hits, flags, False)
 
 
-class WebviewWidget(QtWebKitWidgets.QWebView):
-    """WebKit window in a window"""
-    def __init__(self, parent=None, bridge=None, html=None, debug=None):
+if HAVE_WEBKIT:
+    class WebviewWidget(QWebView):
         """
-        Parameters
-        ----------
-        parent: QObject
-            Parent QObject. If parent has layout(), this widget is added to it.
-        bridge: QObject
-            The "bridge" object exposed as ``window.pybridge`` in JavaScript.
-            Any bridge methods desired to be accessible from JS need to be
-            decorated ``@QtCore.pyqtSlot(<*args>, result=<type>)``.
-        html: str
-            HTML content to set in the webview.
-        debug: bool
-            If True, enable context menu and webkit inspector.
+        WebKit view widget.
+
+        .. warning:
+            QtWebKit was removed from Qt v5.6.0, therefore this class will not
+            be available when using Qt >= 5.6. Port your code to support
+            QtWebEngine (or both).
         """
-        super().__init__(parent)
-        self.setSizePolicy(QSizePolicy(QSizePolicy.Expanding,
-                                       QSizePolicy.Expanding))
-        self._bridge = bridge
-        try: parent.layout().addWidget(self)
-        except (AttributeError, TypeError): pass
-        settings = self.settings()
-        settings.setAttribute(settings.LocalContentCanAccessFileUrls, True)
-        if debug is None:
-            import logging
-            debug = logging.getLogger().level <= logging.DEBUG
-        if debug:
-            settings.setAttribute(settings.DeveloperExtrasEnabled, True)
-        else:
-            self.setContextMenuPolicy(Qt.NoContextMenu)
-        if html:
-            self.setHtml(html)
+        def __init__(self, parent=None, bridge=None, html=None, debug=None):
+            """
+            Parameters
+            ----------
+            parent: QWidget
+                Parent QWidget. If parent has layout(), this widget is added to it.
+            bridge: QObject
+                The "bridge" object exposed as ``window.pybridge`` in JavaScript.
+                Any bridge methods desired to be accessible from JS need to be
+                decorated with` @QtCore.pyqtSlot(<*args>, result=<type>)``.
+            html: str
+                HTML content to set in the webview.
+            debug: bool
+                If True, enable context menu and webkit inspector.
+            """
+            super().__init__(parent)
+            self.setSizePolicy(QSizePolicy(QSizePolicy.Expanding,
+                                           QSizePolicy.Expanding))
+            self._bridge = bridge
+            try: parent.layout().addWidget(self)
+            except (AttributeError, TypeError): pass
+            settings = self.settings()
+            settings.setAttribute(settings.LocalContentCanAccessFileUrls, True)
+            if debug is None:
+                import logging
+                debug = logging.getLogger().level <= logging.DEBUG
+            if debug:
+                settings.setAttribute(settings.DeveloperExtrasEnabled, True)
+            else:
+                self.setContextMenuPolicy(Qt.NoContextMenu)
+            if html:
+                self.setHtml(html)
 
-    def setContent(self, data, mimetype, url=''):
-        super().setContent(data, mimetype, QtCore.QUrl(url))
-        if self._bridge:
-            self.page().mainFrame().addToJavaScriptWindowObject('pybridge', self._bridge)
+        def setContent(self, data, mimetype, url=''):
+            super().setContent(data, mimetype, QtCore.QUrl(url))
+            if self._bridge:
+                self.page().mainFrame().addToJavaScriptWindowObject('pybridge', self._bridge)
 
-    def setHtml(self, html, url=''):
-        self.setContent(html.encode('utf-8'), 'text/html', url)
+        def setHtml(self, html, url=''):
+            self.setContent(html.encode('utf-8'), 'text/html', url)
 
-    def sizeHint(self):
-        return QtCore.QSize(600, 500)
+        def sizeHint(self):
+            return QtCore.QSize(600, 500)
 
-    def evalJS(self, javascript):
-        self.page().mainFrame().evaluateJavaScript(javascript)
+        def evalJS(self, javascript):
+            self.page().mainFrame().evaluateJavaScript(javascript)
 
 
 class ControlledAttributesDict(dict):