[ENH] Implement copying graph to clipboard using Ctrl-C (Cmd-C)

Orange/widgets/classify/owtreeviewer2d.py

@@ -361,7 +361,7 @@ class OWTreeViewer2D(OWWidget):
     _DEF_NODE_WIDTH = 24
     _DEF_NODE_HEIGHT = 20
 
-    graph_name = True
+    graph_name = "scene"
 
     def __init__(self):
         super().__init__()

Orange/widgets/io.py

@@ -1,5 +1,6 @@
 from PyQt4 import QtGui, QtCore, QtSvg
-from PyQt4.QtGui import QGraphicsScene, QGraphicsView, QWidget
+from PyQt4.QtCore import QMimeData
+from PyQt4.QtGui import QGraphicsScene, QGraphicsView, QWidget, QApplication
 
 from Orange.data.io import FileFormat
 
@@ -100,6 +101,23 @@ def _export(exporter, filename):
         buffer.save(filename, "png")
 
 
+class ClipboardFormat(PngFormat):
+    EXTENSIONS = ()
+    DESCRIPTION = 'System Clipboard'
+    PRIORITY = 50
+
+    @staticmethod
+    def _save_buffer(buffer, _):
+        QApplication.clipboard().setPixmap(buffer)
+
+    @staticmethod
+    def _export(exporter, _):
+        buffer = exporter.export(toBytes=True)
+        mimedata = QMimeData()
+        mimedata.setData("image/png", buffer)
+        QApplication.clipboard().setMimeData(mimedata)
+
+
 class SvgFormat(ImgFormat):
     EXTENSIONS = ('.svg',)
     DESCRIPTION = 'Scalable Vector Graphics'

Orange/widgets/widget.py

@@ -18,6 +18,7 @@
 from Orange.canvas.registry import description as widget_description
 from Orange.canvas.report import Report
 from Orange.widgets.gui import ControlledAttributesDict, notify_changed
+from Orange.widgets.io import ClipboardFormat
 from Orange.widgets.settings import SettingsHandler
 from Orange.widgets.utils import saveplot, getdeepattr
 from .utils.overlay import MessageOverlayWidget
@@ -198,6 +199,9 @@ def __new__(cls, *args, **kwargs):
         sc = QShortcut(QKeySequence(Qt.ShiftModifier | Qt.Key_F1), self)
         sc.activated.connect(self.__quicktip)
 
+        sc = QShortcut(QKeySequence.Copy, self)
+        sc.activated.connect(self.copy_to_clipboard)
+
         return self
 
     def __init__(self, *args, **kwargs):
@@ -316,6 +320,12 @@ def save_graph(self):
             return
         saveplot.save_plot(graph_obj, self.graph_writers)
 
+    def copy_to_clipboard(self):
+        graph_obj = getdeepattr(self, self.graph_name, None)
+        if graph_obj is None:
+            return
+        ClipboardFormat.write_image(None, graph_obj)
+
     def __restoreWidgetGeometry(self):
 
         def _fullscreen_to_maximized(geometry):