def _drag_start(self, event):
near=self.listbox.nearest(event.y)
if not self.listbox.select_includes(near):
self._dnd_selection(near)
tuples=self.selected_with_idx()
items=DraggedItemsCopy(self, tuples)
Tkdnd.dnd_start(items, event)
def on_dnd_start(Event):
"""
This is invoked by InitiationObject to start the drag and drop process
"""
#Create an object to be dragged
ThingToDrag = Dragged()
#Pass the object to be dragged and the event to Tkdnd
Tkdnd.dnd_start(ThingToDrag, Event)
def on_dnd_start(Event):
"""
This is invoked by InitiationObject to start the drag and drop process.
"""
#Create an object to be dragged
ThingToDrag = Dragged()
#Pass the object to be dragged and the event to Tkdnd
Tkdnd.dnd_start(ThingToDrag,Event)
def _descPress(self, event):
self.root.balloon.withdraw()
self.root._select(self)
if self.dnd:
Tkdnd.dnd_start(self, event)
event.widget.bind('<Leave>', self._ignore, add=1)
event.widget.bind('<Motion>', self._ignore, add=1)
return 'break'
def on_dnd_start(self, event, type):
# Create placeholder info and add it to tree
print("dnd entered")
ID = len(Workspace.current.get_tree().fields)
info = self.info_from_type(ID, type)
Workspace.current.get_tree().fields.insert(ID, info)
ThingToDrag = Draggable(self, ID)
Tkdnd.dnd_start(ThingToDrag, event)
def _drag_start(self, event):
if self.notify_drag_start:
self.notify_drag_start()
near=self.listbox.nearest(event.y)
if not self.listbox.select_includes(near):
self._dnd_selection(near)
tuples=self.selected_with_idx()
#XXX# self.del_idx(map(lambda t: t[0], tuples))
items=DraggedItems(self, tuples)
Tkdnd.dnd_start(items, event)
self._dnd_selection(self.listbox.nearest(event.y))
def start_move_fixation(self, event):
# TODO Does this really belong here?
# What is the closest fixation?
i1, d1 = self.sc1.closest_fixation(event.x, event.y)
i2, d2 = self.sc2.closest_fixation(event.x, event.y)
if (d1 < d2):
sc = self.sc1
i = i1
else:
sc = self.sc2
i = i2
sc._translate = lambda dx, dy: sc.translate_fixation(i, dx, dy)
sc._command = lambda dx, dy: TranslateFixationCommand(sc, i, dx, dy)
Tkdnd.dnd_start(sc, event)
def start_move_fixation(self, event):
# TODO Does this really belong here?
# What is the closest fixation?
i1, d1 = self.sc1.closest_fixation(event.x, event.y)
i2, d2 = self.sc2.closest_fixation(event.x, event.y)
if (d1 < d2):
sc = self.sc1
i = i1
else:
sc = self.sc2
i = i2
sc._translate = lambda dx, dy:sc.translate_fixation(i, dx, dy)
sc._command = lambda dx, dy: TranslateFixationCommand(sc, i, dx, dy)
Tkdnd.dnd_start(sc, event)
def on_dnd_start(event):
"""
This is invoked by initiation_object to start the drag and drop process
"""
#Create an object to be dragged
try:
image = Image.open("emoji/monsters/1.gif")
except IOError:
tkMessageBox.showerror(
"Open file",
"No emoji available! Ensure there are images in the folders emoji/land and emoji/monsters"
)
return
thing_to_drag = Dragged(image)
thing_to_drag.offset_x=20
thing_to_drag.offset_y=10
#Pass the object to be dragged and the event to Tkdnd
Tkdnd.dnd_start(thing_to_drag,event)
def PVT_click(self, event):
"""Handle mouse clicks by kicking off possible drag'n'drop
processing"""
if self.widget.drop_callback:
if Tkdnd.dnd_start(self, event):
x1, y1, x2, y2 = self.widget.bbox(self.symbol)
self.x_off = (x1 - x2) / 2
self.y_off = (y1 - y2) / 2
else:
# no callback, don't bother with drag'n'drop
self.widget.drag = 0
self.dnd_end(None, None)
def PVT_click(self, event):
"""Handle mouse clicks by kicking off possible drag'n'drop
processing"""
if self.widget.drop_callback:
if Tkdnd.dnd_start(self, event):
x1, y1, x2, y2=self.widget.bbox(self.symbol)
self.x_off=(x1-x2)/2
self.y_off=(y1-y2)/2
else:
# no callback, don't bother with drag'n'drop
self.widget.drag=0
self.dnd_end(None, None)
def Press(self, Event):
# Save our current status
self.OriginalCanvas = self.Canvas
self.OriginalID = self.ID
self.OriginalLabel = self.Label
# Make phantom invisible
self.Label.__hide__()
# Say we have no current label
self.ID = None
self.Label = None
self.Canvas = None
# Ask Tkdnd to start the drag operation
if Tkdnd.dnd_start(self, Event):
# Save where the mouse pointer was in the label so it stays in the
# same relative position as we drag it around
self.OffsetX, self.OffsetY = MouseInWidget(self.OriginalLabel,
Event)
# Draw a label of ourself for the user to drag around
XY = MouseInWidget(self.OriginalCanvas, Event)
self.Appear(self.OriginalCanvas, XY)
def press(self,event):
"""
User has clicked on a label representing us. Initiate drag and drop.
"""
#Save our current label as the Original label
self.original_id = self.id
self.original_canvas = self.canvas
self.canvas.itemconfig(self.id,state=HIDDEN)
#Say we have no current label
self.id = None
self.canvas = None
#Ask Tkdnd to start the drag operation
if Tkdnd.dnd_start(self,event):
#Save where the mouse pointer was in the label so it stays in the
# same relative position as we drag it around
self.offset_x, self.offset_y = mouse_in_item(self.original_canvas,self.original_id,event)
#print self.offset_x, self.offset_y
#Draw a label of ourself for the user to drag around
xy = mouse_in_widget(self.original_canvas,event)
width = self.original_canvas.winfo_width()
height = self.original_canvas.winfo_height()
bounds = (0,0,width,height)
self.appear(self.original_canvas,xy,bounds)
def cs_dragStart(self, event): # start drag Tkdnd.dnd_start(self, event)
def dnd_start(self, event): Tkdnd.dnd_start(self, event)
def cs_dragStart(self, event):
# start drag
Tkdnd.dnd_start(self, event)
def Press(self,Event):
"""
User has clicked on a label representing us. Initiate drag and drop.
There is a problem, er, opportunity here. In this case we would like to
act as both the InitiationObject (because the user clicked on us
and it't up to us to start the drag and drop) but we also want to
act as the dragged object (because it's us the user wants to drag
around). If we simply pass ourself to "Tkdnd" as the dragged object
it won't work because the entire drag and drop process is moved
along by <motion> events as a result of a binding by the widget
on which the user clicked. That widget is the label which represents
us and it get moved around by our "move" method. It also gets
DELETED by our "vanish" method if the user moves it off the current
canvas, which is a perfectly legal thing from them to do. If the
widget which is driving the process gets deleted, the whole drag and
drop grinds to a real quick halt. We use a little sleight of hand to
get around this:
o We take the label which is currently representing us (self.Label)
and we make it into an invisible phantom by setting its text to ''
and settings its relief to FLAT. It is now, so to speak, a polar
bear in a snowstorm. It's still there, but it blends in with the
rest of then canvas on which it sits.
o We move all the information about the phantom label (Canvas, ID
and Label) into variables which store information about the
previous label (PreviousCanvas, PreviousID and PreviousLabel)
o We set self.Canvas and friends to None, which indicates that we
don't have a label representing us on the canvas. This is a bit
of a lie (the phantom is technically on the canvas) but it does no
harm.
o We call "self.Appear" which, noting that don't have a label
representing us on the canvas, promptly draws one for us, which
gets saved as self.Canvas etc.
We went to all this trouble so that:
o The original widget on which the user clicked (now the phantom)
could hang around driving the drag and drop until it is done, and
o The user has a label (the one just created by Appear) which they
can drag around, from canvas to canvas as desired, until they
drop it. THIS one can get deleted from the current canvas and
redrawn on another canvas without Anything Bad happening.
From the users viewpoint the whole thing is seamless: they think
the ARE dragging around the original label, but they are not. To
make it really clear what is happening, go to the top of the
code and set "LeavePhantomVisible" to 1. Then when you drag an
existing object, you will see the phantom.
The phantom is resolved by routine "dnd_end" above. If the user
drops us on a canvas, then we take up residence on the canvas and
the phantom label, no longer needed, is deleted. If the user tries
to drop us in the middle of nowhere, then there will be no
'current' label for us (because we are in the middle of nowhere)
and thus we resurrect the phantom label which in this case
continues to represent us.
Note that this whole deal happens ONLY when the user clicks on an
EXISTING instance of us. In the case where the user clicks over
the button marked "InitiationObject" then it it that button that
IS the initiation object, it creates a copy of us and the whole
opportunity never happens, since the "InitiationObject" button
is never in any danger of being deleted.
"""
Blab(1, "Dragged.press")
#Save our current label as the Original label
self.OriginalID = self.ID
self.OriginalLabel = self.Label
self.OriginalCanvas = self.Canvas
#Make the phantom invisible (unless the user asked to see it)
self.WidgetHide(self.OriginalLabel)
#Say we have no current label
self.ID = None
self.Canvas = None
self.Label = None
#Ask Tkdnd to start the drag operation
if Tkdnd.dnd_start(self,Event):
#Save where the mouse pointer was in the label so it stays in the
# same relative position as we drag it around
self.OffsetX, self.OffsetY = MouseInWidget(self.OriginalLabel,self.OriginalCanvas,Event,Xlate=0)
#Draw a label of ourself for the user to drag around
XY = MouseInWidget(self.OriginalCanvas,self.OriginalCanvas,Event)
self.Appear(self.OriginalCanvas,XY)
def start_move_scanpath(self, event):
sc = self.find_closest_scanpath(event.x, event.y)
# NOTE This mess could be avoided if fixations were objects of their own.
sc._translate = sc.translate
sc._command = lambda dx, dy: TranslateScanpathCommand(sc, dx, dy)
Tkdnd.dnd_start(sc, event)
def Press(self,Event):
"""
User has clicked on a label representing us. Initiate drag and drop.
There is a problem, er, opportunity here. In this case we would like to
act as both the InitiationObject (because the user clicked on us
and it't up to us to start the drag and drop) but we also want to
act as the dragged object (because it's us the user wants to drag
around). If we simply pass ourself to "Tkdnd" as the dragged object
it won't work because the entire drag and drop process is moved
along by <motion> events as a result of a binding by the widget
on which the user clicked. That widget is the label which represents
us and it get moved around by our "move" method. It also gets
DELETED by our "vanish" method if the user moves it off the current
canvas, which is a perfectly legal thing from them to do. If the
widget which is driving the process gets deleted, the whole drag and
drop grinds to a real quick halt. We use a little sleight of hand to
get around this:
1) From the label which is currently representing us (self.Label)
we take the text and save it in self.OriginalText. This will allow
us to resurrect the label at a later time if so desired. (It turns
out we so desire if the user tries to drop us in the middle of
nowhere, but that's a different story; see "dnd_end", above).
2) We take the label which is currently representing us (self.Label)
and we make it into an invisible phantom by setting its text to ''
and settings its relief to FLAT. It is now, so to speak, a polar
bear in a snowstorm. It's still there, but it blends in with the
rest of then canvas on which it sits.
3) We move all the information about the phantom label (Canvas, ID
and Label) into variables which store information about the
previous label (PreviousCanvas, PreviousID and PreviousLabel)
4) We set self.Canvas and friends to None, which indicates that we
don't have a label representing us on the canvas. This is a bit
of a lie (the phantom is technically on the canvas) but it does no
harm.
5) We call "self.Appear" which, noting that don't have a label
representing us on the canvas, promptly draws one for us, which
gets saved as self.Canvas etc.
We went to all this trouble so that:
a) The original widget on which the user clicked (now the phantom)
could hang around driving the drag and drop until it is done, and
b) The user has a label (the one just created by Appear) which they
can drag around, from canvas to canvas as desired, until they
drop it. THIS one can get deleted from the current canvas and
redrawn on another canvas without Anything Bad happening.
From the users viewpoint the whole thing is seamless: they think
the ARE dragging around the original label, but they are not. To
make it really clear what is happening, go to the top of the
code and set "LeavePhantomVisible" to 1. Then when you drag an
existing object, you will see the phantom.
The phantom is resolved by routine "dnd_end" above. If the user
drops us on a canvas, then we take up residence on the canvas and
the phantom label, no longer needed, is deleted. If the user tries
to drop us in the middle of nowhere, then there will be no
'current' label for us (because we are in the middle of nowhere)
and thus we resurrect the phantom label which in this case
continues to represent us.
Note that this whole deal happens ONLY when the user clicks on an
EXISTING instance of us. In the case where the user clicks over
the button marked "InitiationObject" then it it that button that
IS the initiation object, it creates a copy of us and the whole
opportunity never happens, since the "InitiationObject" button
is never in any danger of being deleted.
"""
Blab(1, "Dragged.press")
#Save our current label as the Original label
self.OriginalID = self.ID
self.OriginalLabel = self.Label
self.OriginalText = self.OriginalLabel['text']
self.OriginalCanvas = self.Canvas
#Made the phantom invisible (unless the user asked to see it)
if LeavePhantomVisible:
self.OriginalLabel['text'] = '<phantom>'
self.OriginalLabel['relief']=RAISED
else:
self.OriginalLabel['text'] = ''
self.OriginalLabel['relief']=FLAT
#Say we have no current label
self.ID = None
self.Canvas = None
self.Label = None
#Ask Tkdnd to start the drag operation
if Tkdnd.dnd_start(self,Event):
#Save where the mouse pointer was in the label so it stays in the
# same relative position as we drag it around
self.OffsetX, self.OffsetY = MouseInWidget(self.OriginalLabel,Event)
#Draw a label of ourself for the user to drag around
XY = MouseInWidget(self.OriginalCanvas,Event)
self.Appear(self.OriginalCanvas,XY)
def dnd_start(self, event):
Tkdnd.dnd_start(self, event)
def _drag_start(self, event):
if self.content:
items=DraggedItemsCopy(self, [(0, self.content)])
Tkdnd.dnd_start(items, event)
def start_move_scanpath(self, event):
sc = self.find_closest_scanpath(event.x, event.y)
# NOTE This mess could be avoided if fixations were objects of their own.
sc._translate = sc.translate
sc._command = lambda dx, dy: TranslateScanpathCommand(sc, dx, dy)
Tkdnd.dnd_start(sc, event)
