I am adding line number feature to the text widget by following Bryan Oakley's code here. I am inserting my own XML file in that text box. That file is listed below:
myFile.xml
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<p1:sample1 xmlns:p1="http://www.example.org/eHorizon">
<p1:time nTimestamp="5">
<p1:location hours = "1" path = '1'>
<p1:feature color="6" type="a">560</p1:feature>
<p1:feature color="2" type="a">564</p1:feature>
<p1:feature color="3" type="b">570</p1:feature>
<p1:feature color="4" type="c">570</p1:feature>
</p1:location>
</p1:time>
<p1:time nTimestamp="6">
<p1:location hours = "1" path = '1'>
<p1:feature color="2" type="a">564</p1:feature>
<p1:feature color="3" type="b">570</p1:feature>
<p1:feature color="4" type="c">570</p1:feature>
</p1:location>
</p1:time>
</p1:sample1>
myCode.py
import Tkinter as tk
class TextLineNumbers(tk.Canvas):
def __init__(self, *args, **kwargs):
tk.Canvas.__init__(self, *args, **kwargs)
self.textwidget = None
def attach(self, text_widget):
self.textwidget = text_widget
def redraw(self, *args):
'''redraw line numbers'''
self.delete("all")
i = self.textwidget.index("@0,0")
while True :
dline= self.textwidget.dlineinfo(i)
if dline is None: break
y = dline[1]
linenum = str(i).split(".")[0]
self.create_text(2,y,anchor="nw", text=linenum)
i = self.textwidget.index("%s+1line" % i)
class CustomText(tk.Text):
def __init__(self, *args, **kwargs):
tk.Text.__init__(self, *args, **kwargs)
self.tk.eval('''
proc widget_proxy {widget widget_command args} {
# call the real tk widget command with the real args
set result [uplevel [linsert $args 0 $widget_command]]
# generate the event for certain types of commands
if {([lindex $args 0] in {insert replace delete}) ||
([lrange $args 0 2] == {mark set insert}) ||
([lrange $args 0 1] == {xview moveto}) ||
([lrange $args 0 1] == {xview scroll}) ||
([lrange $args 0 1] == {yview moveto}) ||
([lrange $args 0 1] == {yview scroll})} {
event generate $widget <<Change>> -when tail
}
# return the result from the real widget command
return $result
}
''')
self.tk.eval('''
rename {widget} _{widget}
interp alias {{}} ::{widget} {{}} widget_proxy {widget} _{widget}
'''.format(widget=str(self)))
class Example(tk.Frame):
def __init__(self, *args, **kwargs):
tk.Frame.__init__(self, *args, **kwargs)
self.text = CustomText(self)
self.vsb = tk.Scrollbar(orient="vertical", command=self.text.yview)
self.text.configure(yscrollcommand=self.vsb.set)
self.text.tag_configure("bigfont", font=("Helvetica", "24", "bold"))
self.linenumbers = TextLineNumbers(self, width=30)
self.linenumbers.attach(self.text)
self.vsb.pack(side="right", fill="y")
self.linenumbers.pack(side="left", fill="y")
self.text.pack(side="right", fill="both", expand=True)
self.text.bind("<<Change>>", self._on_change)
self.text.bind("<Configure>", self._on_change)
file = open('C:/your/file/location/myFile.xml')
self.text.insert("end", file.read())
def _on_change(self, event):
self.linenumbers.redraw()
if __name__ == "__main__":
root = tk.Tk()
Example(root).pack(side="top", fill="both", expand=True)
root.mainloop()
What I want:
The result generated on running code looks like this:
I have edited this pic using ms-paint to show red markings. Numbering of lines in red is what I want. As it can be seen that numbering on canvas also includes space, I want to modify code in such a manner that there are no line numbers on empty or white spaces.
So there are two objectives I want to achieve:
1). Follow line numbering in a way numbers marked in red are given.
2). After this changes are made if possible I also want to extract the line number from canvas for any given string for that text widget.
What I tried
I am trying to compare two files and introduce empty lines on places where there are missing points. Before I proceed I need to implement an algorithm which can exclude empty white space from allotting line numbers (which happens with most of the editors). So far I am playing around but cannot find how can I implement this in code above.
