TextCtrl focus events in wxWidgets
I have a simple form with some input values and some calculated values in TextCtrl widgets. What I would like to do is have the display update automaticaly when the user changes one of the input fields, without having to click on a 'Calculate' button. I was thinking of having an update triggered when one of the text Controlls loses focus, indicating that the user has finished changing it's value. I don't want to do an update on every character entry, as this would create a lot of bogus/meaningless updates. There doesn't seem to be such an event. Any ideas how I could implement this, or a similarly user friendly behaviour? Best regards, Simon Hibbs -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Simon Hibbs wrote: I have a simple form with some input values and some calculated values in TextCtrl widgets. What I would like to do is have the display update automaticaly when the user changes one of the input fields, without having to click on a 'Calculate' button. I was thinking of having an update triggered when one of the text Controlls loses focus, indicating that the user has finished changing it's value. I don't want to do an update on every character entry, as this would create a lot of bogus/meaningless updates. There doesn't seem to be such an event. Any ideas how I could implement this, or a similarly user friendly behaviour? It should be quite simple: you need to handle EVT_SET_FOCUS and/or EVT_KILL_FOCUS events (documented in the wxPython docs) to know when to recaclulate the values. Sounds like that should be enough of a hint to you. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Steve Holden wrote: It should be quite simple: you need to handle EVT_SET_FOCUS and/or EVT_KILL_FOCUS events (documented in the wxPython docs) to know when to recaclulate the values. Sounds like that should be enough of a hint to you. I've tried that, but it doesn't work. Here is the test code: self.PlantCtrl = wx.TextCtrl(self, -1, ) self.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl, self.PlantCtrl) def OnUpdatePlantCtrl(self, event): print set Plant When the control loses focus, I don't get the message in the console. I'm trapping other events successfuly elsewhere using similar code. Simon Hibbs . -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Since the event handler of a textctrl inherits from wxCommandEvent, I would guess that the binding should be to EVT_COMMAND_KILL_FOCUS Not tested... Rony Le Wed, 19 Jul 2006 03:15:36 -0700, Simon Hibbs a écrit : Steve Holden wrote: It should be quite simple: you need to handle EVT_SET_FOCUS and/or EVT_KILL_FOCUS events (documented in the wxPython docs) to know when to recaclulate the values. Sounds like that should be enough of a hint to you. I've tried that, but it doesn't work. Here is the test code: self.PlantCtrl = wx.TextCtrl(self, -1, ) self.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl, self.PlantCtrl) def OnUpdatePlantCtrl(self, event): print set Plant When the control loses focus, I don't get the message in the console. I'm trapping other events successfuly elsewhere using similar code. Simon Hibbs . -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
rony steelandt wrote: Since the event handler of a textctrl inherits from wxCommandEvent, I would guess that the binding should be to EVT_COMMAND_KILL_FOCUS Still not working :( Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Simon Hibbs wrote: rony steelandt wrote: Since the event handler of a textctrl inherits from wxCommandEvent, I would guess that the binding should be to EVT_COMMAND_KILL_FOCUS Still not working :( I can trap EVT_TEXT_ENTER events successfuly, without using EVT_COMMAND_ENTER. This almost gets me where I want to be. The user must press 'enter' after modifying each value though. If they forget the UI isn't updated, so I'd need some way of visualy distinguishing between modified values that have been ENTER'd and those that haven't which is a pain, and not very user friendly at all. There must be some way of doing this, but blowed if I can figure it out. Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Simon Hibbs wrote: Steve Holden wrote: It should be quite simple: you need to handle EVT_SET_FOCUS and/or EVT_KILL_FOCUS events (documented in the wxPython docs) to know when to recaclulate the values. Sounds like that should be enough of a hint to you. I've tried that, but it doesn't work. Here is the test code: self.PlantCtrl = wx.TextCtrl(self, -1, ) self.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl, self.PlantCtrl) def OnUpdatePlantCtrl(self, event): print set Plant When the control loses focus, I don't get the message in the console. I'm trapping other events successfuly elsewhere using similar code. Simon Hibbs Try self.PlantCtrl.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl) Frank Millman -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Simon Hibbs wrote: Steve Holden wrote: It should be quite simple: you need to handle EVT_SET_FOCUS and/or EVT_KILL_FOCUS events (documented in the wxPython docs) to know when to recaclulate the values. Sounds like that should be enough of a hint to you. I've tried that, but it doesn't work. Here is the test code: self.PlantCtrl = wx.TextCtrl(self, -1, ) self.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl, self.PlantCtrl) def OnUpdatePlantCtrl(self, event): print set Plant When the control loses focus, I don't get the message in the console. I'm trapping other events successfuly elsewhere using similar code. This would probably be a good question for the wxPython list then - you are clearly in some little-known area of swamp ;-) regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Frank Millman wrote: Try self.PlantCtrl.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl) And Voila! It works. Many, many thanks. Any idea what is going on? Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Simon Hibbs wrote: Frank Millman wrote: Try self.PlantCtrl.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl) And Voila! It works. Many, many thanks. Any idea what is going on? AIUI, wx.EVT_KILL_FOCUS is not a Command Event i.e. it doesn't propagate up the hierarchy of widgets until it gets handled, so it has to be bound explicitly to the control itself, as above. Originally you used: self.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl, self.PlantCtrl) which binds the event to self (presumably the containing frame or panel) and adds the condition that it must come from self.PlantCtrl - which never happens. -- Regards David Hughes -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
On 19 Jul 2006 04:55:24 -0700, Simon Hibbs [EMAIL PROTECTED] wrote: Frank Millman wrote: Try self.PlantCtrl.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl) And Voila! It works. Many, many thanks. Any idea what is going on? Your first attempt used self.Bind, which binds the kill focus event of self to the method. This version binds the kill focus event of the *text control* to the method, which is what you want. I used to get bitten by this a lot, but now I've switched to using the dabo.ui module of Dabo to do my GUI stuff. It has the concept of binding changes in controls to update events, which was needed for database-type apps, but you can bind a control to any property of any object. You should really check it out if you need this sort of interactive updating in your app. http://dabodev.com. -- # p.d. -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
Simon Hibbs wrote: Frank Millman wrote: Try self.PlantCtrl.Bind(wx.EVT_KILL_FOCUS, self.OnUpdatePlantCtrl) And Voila! It works. Many, many thanks. My pleasure Any idea what is going on? I only understand it in simple terms, though it can get complex. Here is my simple explanation. Events are received by objects. There are default event handlers that are called to deal with the events. If you want your own event handler to be called, you use Bind(), which brings together three elements - the window receiving the event (in wxPython, all objects derive from wx.Window), the event itself, and the event handler to be called. In pseudo code, you call Bind() like this - w = the window receiving the event e = the event h = the handler to be called w.Bind(e,h) You bound EVT_KILL_FOCUS to self, which I assume in your case is a panel, but the panel does not receive the KILL_FOCUS event, the text control does. For more information, type help(wx.Window.Bind) at the interpreter prompt. If you want an authoritative answer, post a question to the wxPython mailing list. Robin Dunn, the creator of wxPython and the resident guru, is always happy to explain in detail exactly what is going on. You can also get Robin's book, wxPython In Action. Frank -- http://mail.python.org/mailman/listinfo/python-list
Re: TextCtrl focus events in wxWidgets
David Hughes wrote: AIUI, wx.EVT_KILL_FOCUS is not a Command Event i.e. it doesn't propagate up the hierarchy of widgets until it gets handled, so it has to be bound explicitly to the control itself, as above. Right. This is one of the sources of confusion with events - which ones 'propagate up the hierarchy' and which ones do not. This is a quote from the wxWidgets documentation - Typically events that deal with a window as a window (size, motion, paint, mouse, keyboard, etc.) are sent only to the window. Events that have a higher level of meaning and/or are generated by the window itself, (button click, menu select, tree expand, etc.) are command events and are sent up to the parent to see if it is interested in the event. Simon's first attempt would have been correct if EVT_KILL_FOCUS was treated as a Command Event. Unfortunately, it is not, and therefore it was not passed up to 'self' for handling. Frank -- http://mail.python.org/mailman/listinfo/python-list
