From Vasilis.Vlachoudis at cern.ch  Sun Nov  4 14:37:29 2018
From: Vasilis.Vlachoudis at cern.ch (Vasilis Vlachoudis)
Date: Sun, 4 Nov 2018 19:37:29 +0000
Subject: [Tkinter-discuss] Text drag&drop
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E026A56B4D4@CERNXCHG53.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E026A56B4D4@CERNXCHG53.cern.ch>
Message-ID: <0BC70B5D93E054469872FFD0FE07220E026A579E3E@CERNXCHG53.cern.ch>

Hi all,

answering to my own email :)

#2. I found out my mistake why the Label doesn't appear on the second window
the "event" that it is passed to the dnd_motion is the event referring to the original
window and not the target one. So instead of using the event.x, event.y
I need to use the root coordinates and I convert them to local ones
		x = event.x_root - self.winfo_rootx()
		y = event.y_root - self.winfo_rooty()
		self.dnd_item.place(x=x, y=y)

#1. However I cannot get rid of the #1. I've tried to subclass the DndHandler()
especially the on_motion() method to delete the text anchor (dirty hack) after
looking at the text.tcl  as well deleting the selection and calling the CancelRepeat
to avoid the auto-scrolling, but nothing worked ok.
Is there a way to tell the Text() to stop the selection?

class MyDndHandler(Dnd.DndHandler):
	def __init__(self, source, event):
		super().__init__(source, event)
		anchor = self.source.tk.call("tk::TextAnchor", self.source._w)
		self.source.mark_unset(anchor)

	def on_motion(self, event):
		super().on_motion(event)
		anchor = self.source.tk.call("tk::TextAnchor", self.source._w)
		self.source.mark_unset(anchor)
#		if self.target is not self.source: self.source.tk.call("tk::CancelRepeat")
#		self.source.tag_remove(tk.SEL, "1.0", tk.END)
		return "break"

def dnd_start(source, event):
	h = MyDndHandler(source, event)
	if h.root:
		return h
	else:
		return None

Vasilis 


________________________________________
From: Tkinter-discuss [tkinter-discuss-bounces+vasilis.vlachoudis=cern.ch at python.org] on behalf of Vasilis Vlachoudis [Vasilis.Vlachoudis at cern.ch]
Sent: Wednesday, October 31, 2018 15:27
To: tkinter-discuss at python.org
Subject: [Tkinter-discuss] Text drag&drop

Hi all,

moving from Canvas() to Text() I wanted to re-implement the same drag&drop
functionality I have.
I created a small test program show my problem(s).

I am creating two, Toplevel windows with MyText() inside.
The MyText extends the Text and adds a drag&drop.
For demonstration I've binded on the Control-Button-1 the starting of the drag action
it creates a "floating" Label() with the selected text, which is placed at the mouse position.
Now the problems:
1. The selection on the "drag" window keeps changing as I move the mouse.
   The selection is changing as if there was a grab_set() even if the cursor is on the second window.
2. If I drag the mouse on the second window, despite the Label is created() it doesn't show it.

How can I correct those problems?

Many thanks in advance
Vasilis


import tkinter as tk
import tkinter.dnd as Dnd

class MyText(tk.Text):
        def __init__(self, master, *kw, **kwargs):
                super().__init__(master, *kw, **kwargs)
                self.bind("<Control-Button-1>", self.button1)
                self.dnd_text = None

        # ----------------------------------------------------------------------
        def button1(self, event):
                Dnd.dnd_start(text1, event)
                self.dnd_text = text1.get(tk.SEL_FIRST, tk.SEL_LAST)

        # ----------------------------------------------------------------------
        def dnd_accept(self, source, event):
                return self

        # ----------------------------------------------------------------------
        def dnd_enter(self, source, event):
                self.focus_set()
                self.dnd_item = tk.Label(self, text=source.dnd_text,
                                        border=2, relief=tk.RAISED)
                self.dnd_motion(source, event)

        # ----------------------------------------------------------------------
        def dnd_leave(self, source, event):
                self.dnd_item.place_forget()
                self.dnd_item = None

        # ----------------------------------------------------------------------
        def dnd_motion(self, source, event):
                self.dnd_item.place(x=event.x, y=event.y)

        # ----------------------------------------------------------------------
        def dnd_end(self, target, event):
                if self.dnd_item:
                        self.dnd_item.place_forget()
                        self.dnd_item = None
                self.dnd_text = None

        # ----------------------------------------------------------------------
        # Object has been dropped here
        # ----------------------------------------------------------------------
        def dnd_commit(self, source, event):
                if self.dnd_item:
                        self.dnd_item.place_forget()
                        self.dnd_item = None
                if source.dnd_text is None: return

                self.insert(tk.CURRENT, source.dnd_text)
                self.dnd_text = None

root=tk.Tk()
root.title("Top1")
text1 = MyText(root)
text1.pack(fill=tk.BOTH, expand=tk.YES)
for i in range(1000):
        text1.insert(tk.END, "%d  The quick brown fox jumps over the lazy dog's tail\n"%(i))


top2  = tk.Toplevel(root)
top2.title("Top2")
text2 = MyText(top2)
text2.pack(fill=tk.BOTH, expand=tk.YES)


root.mainloop()
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From klappnase at web.de  Sun Nov  4 16:56:25 2018
From: klappnase at web.de (Michael Lange)
Date: Sun, 4 Nov 2018 22:56:25 +0100
Subject: [Tkinter-discuss] Text drag&drop
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E026A579E3E@CERNXCHG53.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E026A56B4D4@CERNXCHG53.cern.ch>
 <0BC70B5D93E054469872FFD0FE07220E026A579E3E@CERNXCHG53.cern.ch>
Message-ID: <20181104225625.6d6159213af74f6f1b2e10b6@web.de>

Hi,

On Sun, 4 Nov 2018 19:37:29 +0000
Vasilis Vlachoudis <Vasilis.Vlachoudis at cern.ch> wrote:

(...)
> #1. However I cannot get rid of the #1. I've tried to subclass the
> #DndHandler()
> especially the on_motion() method to delete the text anchor (dirty
> hack) after looking at the text.tcl  as well deleting the selection and
> calling the CancelRepeat to avoid the auto-scrolling, but nothing
> worked ok. Is there a way to tell the Text() to stop the selection?

I think you could add something like this to DnDHandler.__init__() :

        def _return_break(widget, event):
            return 'break'
        self._id = widget.bind('<B1-Motion>')
        widget.bind('<B1-Motion>', _return_break)

which should remove the motion-selection binding and then restore it after
the dnd operation has finished by adding

        self.initial_widget.bind('<B1-Motion>', self._id)

to the end of DnDHandler.finish() (untested however).

Regards

Michael





.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

	"The combination of a number of things to make existence
worthwhile." "Yes, the philosophy of 'none,' meaning 'all.'"
		-- Spock and Lincoln, "The Savage Curtain", stardate
5906.4

From Vasilis.Vlachoudis at cern.ch  Mon Nov  5 02:39:33 2018
From: Vasilis.Vlachoudis at cern.ch (Vasilis Vlachoudis)
Date: Mon, 5 Nov 2018 07:39:33 +0000
Subject: [Tkinter-discuss] Text drag&drop
In-Reply-To: <20181104225625.6d6159213af74f6f1b2e10b6@web.de>
References: <0BC70B5D93E054469872FFD0FE07220E026A56B4D4@CERNXCHG53.cern.ch>
 <0BC70B5D93E054469872FFD0FE07220E026A579E3E@CERNXCHG53.cern.ch>,
 <20181104225625.6d6159213af74f6f1b2e10b6@web.de>
Message-ID: <0BC70B5D93E054469872FFD0FE07220E026A57A0EE@CERNXCHG53.cern.ch>

Thanks Michael,

looking at the text.tcl I saw that I need to bind() also the "B1-Enter" and "B1-Leave"
since they are responsible for the AutoRepeat window scroll once you exit the window.
In order not to lose the auto-scroll I've duplicated the functionality copying
from text.tcl and removing the selection auto repeat
like this

...
		self.bind('<B1-Leave>',		self.autoRepeat)
		self.bind('<B1-Enter>',		self.cancelRepeat)
...

	def cancelRepeat(self, event=None):
		if self._autoId:
			self.after_cancel(self._autoId)
		self._autoId = None
		return "break"

	def autoRepeat(self, event=None):
		self._autoId = None
		if not self.winfo_exists(): return "break"

		if event is None:
			x, y = self._autoPos
		else: # Unfortunatelly the scroll is fixed from the first time it exits
			x, y = self._autoPos = event.x, event.y
# Something like this would be more dynamic, but it doesn't work
#		x = self.winfo_pointerx() - self.winfo_rootx()
#		y = self.winfo_pointery() - self.winfo_rooty()

		if y > self.winfo_height():
			self.yview(tk.SCROLL, 1+y-self.winfo_height(), "pixels")
		elif y < 0:
			self.yview(tk.SCROLL, -1+y, "pixels")
		elif x > self.winfo_width():
			self.xview(tk.SCROLL,  2, tk.UNITS)
		elif x < 0:
			self.xview(tk.SCROLL, -2, tk.UNITS)
		else:
			return "break"
		self._autoId = self.after(50, self.autoRepeat)
		return "break"

Vasilis

________________________________________
From: Tkinter-discuss [tkinter-discuss-bounces+vasilis.vlachoudis=cern.ch at python.org] on behalf of Michael Lange [klappnase at web.de]
Sent: Sunday, November 04, 2018 22:56
To: tkinter-discuss at python.org
Subject: Re: [Tkinter-discuss] Text drag&drop

Hi,

On Sun, 4 Nov 2018 19:37:29 +0000
Vasilis Vlachoudis <Vasilis.Vlachoudis at cern.ch> wrote:

(...)
> #1. However I cannot get rid of the #1. I've tried to subclass the
> #DndHandler()
> especially the on_motion() method to delete the text anchor (dirty
> hack) after looking at the text.tcl  as well deleting the selection and
> calling the CancelRepeat to avoid the auto-scrolling, but nothing
> worked ok. Is there a way to tell the Text() to stop the selection?

I think you could add something like this to DnDHandler.__init__() :

        def _return_break(widget, event):
            return 'break'
        self._id = widget.bind('<B1-Motion>')
        widget.bind('<B1-Motion>', _return_break)

which should remove the motion-selection binding and then restore it after
the dnd operation has finished by adding

        self.initial_widget.bind('<B1-Motion>', self._id)

to the end of DnDHandler.finish() (untested however).

Regards

Michael





.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

        "The combination of a number of things to make existence
worthwhile." "Yes, the philosophy of 'none,' meaning 'all.'"
                -- Spock and Lincoln, "The Savage Curtain", stardate
5906.4
_______________________________________________
Tkinter-discuss mailing list
Tkinter-discuss at python.org
https://mail.python.org/mailman/listinfo/tkinter-discuss