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Replace cell widgets by pixmaps while dragging on overlays #18

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Replace cell widgets by pixmaps while dragging on overlays #18

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4497ddc
Hack to replace cells with images during drag
remram44 Mar 20, 2013
5593831
Adds WA_TransparentForMouseEvents
remram44 Mar 21, 2013
0a96c94
Removes scrollarea to avoid VTK having siblings
remram44 Apr 3, 2013
1de939e
Keeps the scrollarea around during the drag
remram44 Apr 18, 2013
408ceed
Gets a pixmap from the widget *before* removing it
remram44 Apr 18, 2013
77f7cfd
Added pixmap replacement for "show overlay" button
rexissimus May 27, 2015
12c3485
Removes _displayed_widget
remram44 Jun 9, 2015
9efdce8
Removes _saved_widget
remram44 Jun 9, 2015
8bf7610
Major rewrite of the pixmap-widget logic
remram44 Jun 9, 2015
9327d20
Removes painted red cross on pixmap (for debug)
remram44 Jun 9, 2015
a90de6a
Fixed flickering when dragging variable over existing plot
rexissimus Jun 15, 2015
d881733
Add missing WA_TransparentForMouseEvents
remram44 Jun 15, 2015
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109 changes: 95 additions & 14 deletions dat/gui/cellcontainer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,8 @@ def __init__(self, cellInfo=None, widget=None, error=None, parent=None):

self._parameter_hovered = None
self._insert_pos = None
self._dragging = False
self._fake_widget = None

# Notifications
app = get_vistrails_application()
Expand All @@ -62,7 +64,7 @@ def __init__(self, cellInfo=None, widget=None, error=None, parent=None):

# Overlay
self._overlay = None
self._overlay_scrollarea = QtGui.QScrollArea(self)
self._overlay_scrollarea = QtGui.QScrollArea() # FIXME: no parent
self._overlay_scrollarea.setObjectName('overlay_scrollarea')
self._overlay_scrollarea.setStyleSheet(
'QScrollArea#overlay_scrollarea {'
Expand All @@ -72,6 +74,7 @@ def __init__(self, cellInfo=None, widget=None, error=None, parent=None):
' background-color: transparent;'
'}')
self._overlay_scrollarea.setWidgetResizable(True)
self._overlay_scrollarea.setVisible(False)

# Toolbar
self._container_toolbar = QtGui.QToolBar(self)
Expand Down Expand Up @@ -144,17 +147,67 @@ def setCellInfo(self, cellInfo):
app.unregister_notification(
'dragging_to_overlays', self._set_dragging)

def _set_dragging(self, dragging):
"""This is a hack to avoid an issue with Qt's mouse event propagation.
def _make_fake_widget(self):
if self._fake_widget is None:
if hasattr(self.containedWidget, 'grabWindowPixmap'):
pixmap = self.containedWidget.grabWindowPixmap()
else:
pixmap = QtGui.QPixmap.grabWidget(self.containedWidget)

self.containedWidget.setAttribute(
QtCore.Qt.WA_TransparentForMouseEvents, True)
self.containedWidget.setParent(None)
self.containedWidget.hide()

If we don't set TransparentForMouseEvents on the overlay, when the drag
enters, the overlay will receive the mouse event and propagate it to
us. Thus it is on the call stack and we can't replace it with another
overlay... It would cause a segmentation fault on Mac OS.
self._fake_widget = QtGui.QLabel(self)
self._fake_widget.setPixmap(pixmap)
self._fake_widget.setAttribute(
QtCore.Qt.WA_TransparentForMouseEvents, True)

def _set_dragging(self, dragging):
"""This is a hack to workaround issues related to dragging.
"""
self._dragging = dragging

# Issue with Qt's mouse event propagation.
#
# If we don't set TransparentForMouseEvents on the overlay, when the
# drag enters, the overlay will receive the mouse event and propagate
# it to us. Thus it is on the call stack and we can't replace it with
# another overlay... It would cause a segmentation fault on Mac OS.
self._overlay_scrollarea.setAttribute(
QtCore.Qt.WA_TransparentForMouseEvents, dragging)

# Issue with some non-Qt widgets, such as VTK's (that use direct
# rendering)
# We can just replace the cell with an image of the previous content,
# like the spreadsheet does with QCellPresenter
if dragging:
if self.containedWidget is not None:
self._make_fake_widget()
self._fake_widget.raise_()
self._fake_widget.show()

self._overlay_scrollarea.setParent(self)
self._overlay_scrollarea.setVisible(True)
self._overlay_scrollarea.lower()

self.do_layout()
else:
if self._fake_widget is not None:
self._fake_widget.setParent(None)
self._fake_widget.deleteLater()
self._fake_widget = None
if self.containedWidget is not None:
self.containedWidget.setAttribute(
QtCore.Qt.WA_TransparentForMouseEvents, False)

self.containedWidget.setParent(self)
self.containedWidget.show()
self.containedWidget.raise_()

self.do_layout()

def _variable_added(self, controller, varname, renamed_from=None):
if (renamed_from is None or
controller != self._controller or
Expand Down Expand Up @@ -208,24 +261,24 @@ def setWidget(self, widget):
This is called by the spreadsheet to put or remove a visualization in
this cell.
"""
if widget != self.containedWidget:
assert self._fake_widget is None
if widget is not self.containedWidget:
if self.containedWidget:
self.containedWidget.setParent(None)
self.containedWidget.deleteLater()
self.toolBar = None
if widget:
widget.setParent(self)
widget.show()
self.containedWidget = widget

if widget is None:
return
widget.raise_()
self._set_toolbar_buttons(True)

self.contentsUpdated()

def takeWidget(self):
assert self._fake_widget is None
widget = self.containedWidget
if widget is not None:
widget.setParent(None)
Expand Down Expand Up @@ -273,7 +326,7 @@ def contentsUpdated(self):
self._set_overlay(None)

def _set_overlay(self, overlay_class, **kwargs):
if overlay_class is None:
if overlay_class is None and not self._execute_pending:
# Default overlay
if self._plot is not None and self.has_error():
self._set_overlay(VariableDroppingOverlay, overlayed=False)
Expand All @@ -293,22 +346,45 @@ def _set_overlay(self, overlay_class, **kwargs):

if overlay_class is None:
self._overlay = None
self._overlay_scrollarea.lower()
if not self._dragging:
self._overlay_scrollarea.setParent(None)
self._overlay_scrollarea.setVisible(False)
if self._plot is not None:
self._set_toolbar_buttons(True)
else:
self._set_toolbar_buttons(None)

if self._fake_widget is not None:
self._fake_widget.setParent(None)
self._fake_widget.deleteLater()
self._fake_widget = None
if self.containedWidget:
self.containedWidget.setParent(self)
self.containedWidget.show()
self.containedWidget.raise_()
self.containedWidget.setAttribute(
QtCore.Qt.WA_TransparentForMouseEvents, False)
self.do_layout()

# Now that we are done with the overlay, we can go on with a
# deferred execution
if self._execute_pending:
self.update_pipeline()
self._execute_pending = False
else:
if self.containedWidget is not None:
self._make_fake_widget()
self._fake_widget.lower()
self._fake_widget.show()

self._overlay = overlay_class(self, **kwargs)
if not self._dragging:
self._overlay_scrollarea.setParent(self)
self._overlay_scrollarea.setVisible(True)
self._overlay_scrollarea.setWidget(self._overlay)
self._overlay.show()
self._overlay_scrollarea.raise_()

self.do_layout()
self._set_toolbar_buttons(None)

Expand Down Expand Up @@ -347,8 +423,13 @@ def resizeEvent(self, event):
self.do_layout()

def do_layout(self):
if self.containedWidget is not None:
self.containedWidget.setGeometry(
if self._fake_widget is not None:
widget = self._fake_widget
else:
widget = self.containedWidget

if widget is not None:
widget.setGeometry(
4, 4,
self.width() - 8, self.height() - 8)
self._overlay_scrollarea.setGeometry(
Expand Down