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POHow to create child window and communicate with parent in TkInter
 

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    <p>I'm creating some dialogs using TkInter and need to be able to open a child sub-window (modal or modeless) on clicking a button in the parent. The child would then allow a data record to be created and this data (either the record or if the operation was cancelled) needs to be communicated back to the parent window. So far I have:</p> <pre><code>import sel_company_dlg from Tkinter import Tk def main(): root = Tk() myCmp = sel_company_dlg.SelCompanyDlg(root) root.mainloop() if __name__ == '__main__': main() </code></pre> <p>This invokes the top level dialog which allows the user to select a company. The company selection dialog looks like this:</p> <pre><code>class SelCompanyDlg(Frame): def __init__(self, parent): Frame.__init__(self, parent) self.parent_ = parent self.frame_ = Frame( self.parent_ ) // .. more init stuff .. self.btNew_ = Button( self.frame_, text="New ...", command=self.onNew ) def onNew(self): root = Toplevel() myCmp = company_dlg.CompanyDlg(root) </code></pre> <p>On clicking the <strong>New ...</strong> button, a Create Company dialog is displayed which allows the user to fill in company details and click on create or cancel. Here's the opening bit of that:</p> <pre><code>class CompanyDlg(Frame): def __init__(self, parent): Frame.__init__(self, parent) // etc. </code></pre> <p>I'm struggling with the best way of invoking the child dialog in <code>onNew()</code> - what I have works but I'm not convinced it's the best approach and also, I can't see how to communicate the details to and from the child dialog.</p> <p>I've tried looking at online tutorials / references but what I've found is either too simplistic or focuses on things like <code>tkMessageBox.showinfo()</code> which iss not what I want.</p>
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