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POtkinter prevent deletion of selected text with return key
 

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  1. POtkinter prevent deletion of selected text with return key
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    <p>I am implementing a tkinter text widget based console application and as a part of auto complete feature, I am observing one problem that on pressing return key results in the deletion of the selected text. Below example shows the similar problem :</p> <pre><code>from Tkinter import * def getCommand(*args): global text text.insert(END, "\n") text.insert(END, "command&gt;") x = text.get("1.0",END) print "command is %s" %(x) return 'break' def handle_keyrelease(event): global text if event.keysym == "Return": text.tag_remove(SEL,"1.9",END) text.mark_set("insert",END) getCommand() return 'break' root = Tk() text = Text(root) text.pack() text.insert(END,"command&gt;") text.focus() text.bind("&lt;KeyRelease&gt;", handle_keyrelease) text.insert(END,"sometext") text.tag_add(SEL,"1.9",END) text.mark_set("insert","1.9") root.mainloop() </code></pre> <p>In this code, when I hit the return key, I want to get the complete command <code>sometext</code>, however with the current code only <code>s</code> is retrieved. I have tried setting the cursor position to end and deletion of selection tag when the return key event is recieved. </p> <p><em><strong>EDIT</em></strong></p> <p>Problem with <code>KeyPress</code> event handler :</p> <pre><code>from Tkinter import * def getCommand(*args): global text text.insert(END, "\n") text.insert(END, "command&gt;") x = text.get("1.0",END) print x return 'break' validkeysymchars = [] validkeysymchars = validkeysymchars + map(chr, range(65,91)) validkeysymchars = validkeysymchars + map(chr, range(97,123)) def handle_keyrelease(event): global text if event.keysym == "Return": text.tag_remove(SEL,"1.9",END) text.mark_set("insert",END) getCommand() return 'break' if event.keysym in validkeysymchars: for x in ['testcommand']: strtocmp = text.get("MARK","end") strtocmp = strtocmp.encode('ascii','ignore') strtocmp = strtocmp.strip() print strtocmp if x.startswith(strtocmp): currpos = text.index(INSERT) text.insert(END,x[len(strtocmp):]) text.tag_add(SEL,currpos,"%s+%dc"%(currpos,len(x)-len(strtocmp))) text.mark_set("insert",currpos) root = Tk() text = Text(root) text.pack() text.insert(END,"command&gt;") text.mark_set("MARK",INSERT) text.mark_gravity("MARK",LEFT) text.focus() text.bind("&lt;KeyPress&gt;", handle_keyrelease) root.mainloop() </code></pre>
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