Line-by-line text file display in wxpython

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Line-by-line text file display in wxpython

 
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  #1
Jun 27th, 2009
I'm trying to learn wxPython. Unfortunately when I came to China in Jan I had to leave the nice wxPython book in Canada because it was too heavy for my suitcase. So I humbly ask you to bear with my ignorance.

As practice (and because I have a practical use for it) I want to read in a textfile and display the text line by line. Much to my surprise & delight, the following program actually works!
python Syntax (Toggle Plain Text) 
  1. ''' TextFileDisp00.py
  2. '''
  3.  
  4. import wx
  5. import codecs
  6.  
  7. #-------------------
  8. class TextFrame(wx.Frame):
  9.  
  10.     def __init__(self, parent, mytitle, mysize):
  11.         wx.Frame.__init__(self, parent, -1, mytitle, mysize)
  12.         self.menubar = wx.MenuBar()
  13.         self.file = wx.Menu()
  14.         self.SetMenuBar(self.menubar)
  15.         self.menubar.Append(self.file,'&File')
  16.         self.openitem = self.file.Append(wx.ID_ANY,'&Open')
  17.         self.Bind(wx.EVT_MENU,self.openevent,self.openitem)
  18.         self.runitem = self.file.Append(wx.ID_ANY,'&Run')
  19.         self.Bind(wx.EVT_MENU,self.runevent,self.runitem)
  20.         self.exititem = self.file.Append(wx.ID_ANY,'E&xit')
  21.         self.Bind(wx.EVT_MENU,self.exitevent,self.exititem)
  22.  
  23.         self.background = wx.Panel(self)
  24.         self.vbox = wx.BoxSizer(wx.VERTICAL)
  25.         self.vbox.Add(self.background, proportion=0, flag=wx.EXPAND)
  26.         self.SetSizer(self.vbox)
  27.         self.fileisopen = False
  28.         self.Show()
  29.  
  30.     def openevent(self, event):
  31.         filedialog = wx.FileDialog(self,
  32.             message = 'Open text file',
  33.             defaultDir = '.',
  34.             defaultFile = 'TestTOC.txt',
  35.             wildcard = 'Text file (*.txt;*.prn)| *.txt;*.prn',
  36.             style = wx.OPEN)
  37.         if filedialog.ShowModal() == wx.ID_OK:
  38.             self.path = filedialog.GetPath()
  39.             self.fileisopen = True
  40.  
  41.     def runevent(self, event):
  42.         if not self.fileisopen:
  43.             msgbox = wx.MessageDialog(self.background, message="No file is open!", style=wx.OK)
  44.             if msgbox.ShowModal() == wx.ID_OK:
  45.                 msgbox.Destroy()
  46.         else:
  47.             myOK = True
  48.             linenr = 0
  49.             InFile = codecs.open(self.path, 'r')
  50.             textline = InFile.readline()
  51.             while textline <> '' and myOK:
  52.                 linenr += 1
  53.                 msg = "Line " + repr(linenr) + ": " + textline
  54.                 msgbox = wx.MessageDialog(self.background, message=msg, style=wx.OK+wx.CANCEL)
  55.                 if msgbox.ShowModal() == wx.ID_CANCEL:
  56.                     myOK = False
  57.                 msgbox.Destroy()
  58.                 textline = InFile.readline()
  59.             msg = "Finished, # lines = " + repr(linenr)
  60.             msgbox = wx.MessageDialog(self.background, message=msg, style=wx.OK)
  61.             if msgbox.ShowModal() == wx.ID_OK:
  62.                 msgbox.Destroy()
  63.             InFile.close()
  64.             self.Destroy()
  65.  
  66.     def exitevent(self, event):
  67.         self.Destroy()
  68.  
  69. #-------------------
  70. ''' Main application
  71. '''
  72.  
  73. app = wx.App(redirect = False)
  74. mywidth = 300
  75. myheight = 150
  76. mytitle = "Text file display"
  77. frame = TextFrame(None, mytitle, (mywidth,myheight))
  78. app.MainLoop()
I would appreciate the comments of experienced users about style and things I have not understood. I have a couple of specific questions as well:

1. I don't seem to understand sizers, and I can't make the background panel extend to the bottom of the app window.

2. I would like to display the text much bigger, i.e. in a (possibly multiline) textbox in which I could set font and font color & size. But I would still like to use a modal box, so I can press Enter to see the next line. How is this done?

Thanks for your help and understanding! Next time my questions might be smarter.
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Re: Line-by-line text file display in wxpython

 
0
  #2
Jun 27th, 2009
Corrected your code a little and it works just fine:
python Syntax (Toggle Plain Text) 
  1. ''' TextFileDisp00.py
  2. '''
  3.  
  4. import wx
  5. import codecs
  6.  
  7. #-------------------
  8. class TextFrame(wx.Frame):
  9.  
  10.     def __init__(self, parent, mytitle, mysize):
  11.         wx.Frame.__init__(self, parent, -1, mytitle, mysize)
  12.         self.menubar = wx.MenuBar()
  13.         self.file = wx.Menu()
  14.         self.SetMenuBar(self.menubar)
  15.         self.menubar.Append(self.file,'&File')
  16.         self.openitem = self.file.Append(wx.ID_ANY,'&Open')
  17.         self.Bind(wx.EVT_MENU,self.openevent,self.openitem)
  18.         self.runitem = self.file.Append(wx.ID_ANY,'&Run')
  19.         self.Bind(wx.EVT_MENU,self.runevent,self.runitem)
  20.         self.exititem = self.file.Append(wx.ID_ANY,'E&xit')
  21.         self.Bind(wx.EVT_MENU,self.exitevent,self.exititem)
  22.  
  23.         self.background = wx.Panel(self)
  24.         self.background.SetBackgroundColour("white")
  25.         self.vbox = wx.BoxSizer(wx.VERTICAL)
  26.         self.vbox.Add(self.background, proportion=1, flag=wx.EXPAND)  #!!!!
  27.         self.SetSizer(self.vbox)
  28.         self.fileisopen = False
  29.         self.Show()
  30.  
  31.     def openevent(self, event):
  32.         filedialog = wx.FileDialog(self,
  33.             message = 'Open text file',
  34.             defaultDir = '.',
  35.             defaultFile = 'TestTOC.txt',
  36.             wildcard = 'Textfile (.txt .prn)|*.txt;*.prn|All (.*)|*.*', #!!!!
  37.             style = wx.OPEN)
  38.         if filedialog.ShowModal() == wx.ID_OK:
  39.             self.path = filedialog.GetPath()
  40.             self.fileisopen = True
  41.  
  42.     def runevent(self, event):
  43.         if not self.fileisopen:
  44.             msgbox = wx.MessageDialog(self.background,
  45.                 message="No file is open!", style=wx.OK)
  46.             if msgbox.ShowModal() == wx.ID_OK:
  47.                 msgbox.Destroy()
  48.         else:
  49.             myOK = True
  50.             linenr = 0
  51.             InFile = codecs.open(self.path, 'r')
  52.             textline = InFile.readline()
  53.             while textline <> '' and myOK:
  54.                 linenr += 1
  55.                 msg = "Line " + repr(linenr) + ": " + textline
  56.                 msgbox = wx.MessageDialog(self.background,
  57.                     message=msg, style=wx.OK+wx.CANCEL)
  58.                 if msgbox.ShowModal() == wx.ID_CANCEL:
  59.                     myOK = False
  60.                 msgbox.Destroy()
  61.                 textline = InFile.readline()
  62.             msg = "Finished, # lines = " + repr(linenr)
  63.             msgbox = wx.MessageDialog(self.background,
  64.                 message=msg, style=wx.OK)
  65.             if msgbox.ShowModal() == wx.ID_OK:
  66.                 msgbox.Destroy()
  67.             InFile.close()
  68.             self.Destroy()
  69.  
  70.     def exitevent(self, event):
  71.         self.Destroy()
  72.  
  73. #-------------------
  74. ''' Main application
  75. '''
  76.  
  77. app = wx.App(redirect = False)
  78. mywidth = 300
  79. myheight = 150
  80. mytitle = "Text file display"
  81. frame = TextFrame(None, mytitle, (mywidth,myheight))
  82. app.MainLoop()
Line one of wx.AboutBox() has a larger font, maybe you can use that. See:
http://www.daniweb.com/forums/post901743-112.html
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Re: Line-by-line text file display in wxpython

 
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  #3
Jun 28th, 2009
Sneekula, thanks for your reply! From your comments I conclude that a modal dialog is too limited for the kind of display I want. Here's a second try at displaying all lines of a file sequentially, using a text box instead. But it doesn't wait for me to press Enter, so all I see is the last line of the file. What to do?
python Syntax (Toggle Plain Text) 
  1. import wx
  2. import codecs
  3.  
  4. #-------------------
  5. class TextFrame(wx.Frame):
  6.  
  7.     def __init__(self, parent, mytitle, mysize):
  8.         wx.Frame.__init__(self, parent, -1, mytitle, mysize)
  9.         self.menubar = wx.MenuBar()
  10.         self.file = wx.Menu()
  11.         self.SetMenuBar(self.menubar)
  12.         self.menubar.Append(self.file,'&File')
  13.         self.openitem = self.file.Append(wx.ID_ANY,'&Open')
  14.         self.Bind(wx.EVT_MENU,self.openevent,self.openitem)
  15.         self.runitem = self.file.Append(wx.ID_ANY,'&Run')
  16.         self.Bind(wx.EVT_MENU,self.runevent,self.runitem)
  17.         self.exititem = self.file.Append(wx.ID_ANY,'E&xit')
  18.         self.Bind(wx.EVT_MENU,self.exitevent,self.exititem)
  19.  
  20.         self.background = wx.Panel(self)
  21.         self.background.SetBackgroundColour("white")
  22.  
  23.         self.textdisp = wx.TextCtrl(self.background, 100,
  24.             style = wx.TE_READONLY | wx.TE_MULTILINE | wx.TE_PROCESS_ENTER)
  25.         wx.EVT_TEXT_ENTER ( self.background, 100, self.handleEnter )
  26.  
  27.         self.vbox = wx.BoxSizer(wx.VERTICAL)
  28.         self.vbox.Add(self.textdisp, proportion=1, border=0, flag=wx.EXPAND)
  29.         self.background.SetSizer(self.vbox)
  30.         self.fileisopen = False
  31.         self.Show()
  32.  
  33.     def handleEnter(self, event):
  34.         pass # ?? what to do?
  35.  
  36.     def openevent(self, event):
  37.         filedialog = wx.FileDialog(self,
  38.             message = 'Open text file',
  39.             defaultDir = '.',
  40.             defaultFile = 'TestTOC.txt',
  41.             wildcard = 'Text file (*.txt;*.prn)| *.txt;*.prn',
  42.             style = wx.OPEN)
  43.         if filedialog.ShowModal() == wx.ID_OK:
  44.             self.path = filedialog.GetPath()
  45.             self.fileisopen = True
  46.  
  47. # Display the lines of the file sequentially. Wait for <Enter> between lines -- how??
  48.  
  49.     def runevent(self, event):
  50.         if not self.fileisopen:
  51.             msgbox = wx.MessageDialog(self.background, message="No file is open!", style=wx.OK)
  52.             if msgbox.ShowModal() == wx.ID_OK:
  53.                 msgbox.Destroy()
  54.         else:
  55.             myOK = True
  56.             linenr = 0
  57.             InFile = codecs.open(self.path, 'r')
  58.             textline = InFile.readline()
  59.             while textline <> '' and myOK:
  60.                 linenr += 1
  61.                 textstr = "Line " + repr(linenr) + ": " + textline
  62.                 self.textdisp.SetValue(textstr) # ?? Now I want to wait for <Enter>
  63.  
  64.                 textline = InFile.readline()
  65.             msg = "Finished, # lines = " + repr(linenr)
  66.             msgbox = wx.MessageDialog(self.background, message=msg, style=wx.OK)
  67.             if msgbox.ShowModal() == wx.ID_OK:
  68.                 msgbox.Destroy()
  69.             InFile.close()
  70.             self.Destroy()
  71.  
  72.     def exitevent(self, event):
  73.         self.Close(True)
  74.  
  75. #-------------------
  76. ''' Main application
  77. '''
  78. app = wx.App(redirect = False)
  79. mywidth = 300
  80. myheight = 150
  81. mytitle = "Text file display"
  82. frame = TextFrame(None, mytitle, (mywidth,myheight))
  83. app.MainLoop()
If I can get this working, then I'll replace the TextCtrl by a RichTextCtrl (?) that will allow me to change font size etc., but first things first.

It's VERY difficult to find the documentation I need on the Web. Is there a place where things like wx.TE_PROCESS_ENTER and wx.EVT_TEXT_ENTER are actually explained? I truly hate blundering around in the dark like this.

Thanks again for your help (and anyone else's who wants to)!
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A better idea! Ignore previous post please

 
0
  #4
Jun 28th, 2009
Excuse me! I'm really not clever yet with GUI programming, my apologies! I just realized that the behavior I want from the Enter key has nothing to do with the textbox display, which after all is just showing stuff out of the file. Here's a version that does what I want.
Python Syntax (Toggle Plain Text) 
  1. import wx
  2. import codecs
  3.  
  4. #-------------------
  5. class TextFrame(wx.Frame):
  6.  
  7.     def __init__(self, parent, mytitle, mysize):
  8.         wx.Frame.__init__(self, parent, -1, mytitle, mysize)
  9.         self.menubar = wx.MenuBar()
  10.         self.file = wx.Menu()
  11.         self.SetMenuBar(self.menubar)
  12.         self.menubar.Append(self.file,'&File')
  13.         self.openitem = self.file.Append(wx.ID_ANY,'&Open')
  14.         self.Bind(wx.EVT_MENU,self.openevent,self.openitem)
  15.         self.runitem = self.file.Append(wx.ID_ANY,'&Run')
  16.         self.Bind(wx.EVT_MENU,self.runevent,self.runitem)
  17.         self.exititem = self.file.Append(wx.ID_ANY,'E&xit')
  18.         self.Bind(wx.EVT_MENU,self.exitevent,self.exititem)
  19.  
  20.         self.background = wx.Panel(self)
  21.         self.background.SetBackgroundColour("white")
  22.  
  23.         self.textdisp = wx.TextCtrl(self.background, 100,
  24.             style = wx.TE_READONLY | wx.TE_MULTILINE)
  25.  
  26.         self.vbox = wx.BoxSizer(wx.VERTICAL)
  27.         self.vbox.Add(self.textdisp, proportion=1, border=0, flag=wx.EXPAND)
  28.         self.background.SetSizer(self.vbox)
  29.         self.fileisopen = False
  30.         self.myOK = True
  31.         self.Show()
  32.  
  33.     def openevent(self, event):
  34.         filedialog = wx.FileDialog(self,
  35.             message = 'Open text file',
  36.             defaultDir = '.',
  37.             defaultFile = 'TestTOC.txt',
  38.             wildcard = 'Text file (*.txt;*.prn)| *.txt;*.prn',
  39.             style = wx.OPEN)
  40.         if filedialog.ShowModal() == wx.ID_OK:
  41.             self.path = filedialog.GetPath()
  42.             self.fileisopen = True
  43.  
  44. # Display the lines of the file sequentially. Wait for <Enter> between lines by posting a modal message box.
  45.  
  46.     def runevent(self, event):
  47.         if not self.fileisopen:
  48.             msgbox = wx.MessageDialog(self.background, message="No file is open!", style=wx.OK)
  49.             if msgbox.ShowModal() == wx.ID_OK:
  50.                 msgbox.Close(True)
  51.         else:
  52.             self.myOK = True
  53.             linenr = 0
  54.             InFile = codecs.open(self.path, 'r')
  55.             textline = InFile.readline()
  56.             while textline <> '' and self.myOK:
  57.                 linenr += 1
  58.                 textstr = "Line " + repr(linenr) + ": " + textline
  59.                 self.textdisp.SetValue(textstr)
  60.  
  61.                 msg = 'Show next line?'
  62.                 msgbox = wx.MessageDialog(self.background, message=msg, style=wx.YES_NO)
  63.                 if msgbox.ShowModal() == wx.ID_NO:
  64.                     self.myOK = False
  65.                 msgbox.Close(True)
  66.  
  67.                 textline = InFile.readline()
  68.             msg = "Finished, # lines = " + repr(linenr)
  69.             msgbox = wx.MessageDialog(self.background, message=msg, style=wx.OK)
  70.             if msgbox.ShowModal() == wx.ID_OK:
  71.                 msgbox.Destroy()
  72.             InFile.close()
  73.             self.Destroy()
  74.  
  75.     def exitevent(self, event):
  76. #        self.Destroy()
  77.         self.Close(True)
  78.  
  79. #-------------------
  80. ''' Main application
  81. '''
  82.  
  83. app = wx.App(redirect = False)
  84. mywidth = 300
  85. myheight = 150
  86. mytitle = "Text file display"
  87. frame = TextFrame(None, mytitle, (mywidth,myheight))
  88. app.MainLoop()
Now every line of the file displays separately, and I can continue viewing by pressing Enter or quit by choosing NO.

Ideally I would want my message box to be invisible and just respond to Enter to continue, and to some other key, say Esc, to pause, resume at a different line, open another file, or quit. Are there any invisible message boxes on the market?

My deep apologies if you read the previous message uselessly. I would have edited or deleted it but didn't know how.
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Re: Line-by-line text file display in wxpython

 
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  #5
Jun 28th, 2009
I guess the person who developed wxPython as a wrapper for wxWindows (written in C++) didn't do much about documentation, leaving that to his book he published later. The rub was that the editor of the book introduced a lot of errors and made the book not very friendly to use.
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Re: Line-by-line text file display in wxpython

 
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  #6
Jun 28th, 2009
I always use the wxPython api when i want to find something out, its a very very useful skill to be able to do that, because of the lack of documentation you really have to try and use what you do have.

I once wrote a small explanation on wxTextCtrl, ill attach it to the post, its a pdf. One bit of it goes over the side of the page, sorry bout that

Hope it helps
Attached Files
File Type: pdf wxTextCtrl.pdf (32.4 KB, 3 views)
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Re: Line-by-line text file display in wxpython

 
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  #7
Jun 28th, 2009
Sneekula, thanks for your help. I feel like my WxPython expertise has gone up from level 0 to at least 0.1. And I am reading the very clear GUI tutorials on this site, thanks for these too.
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Re: Line-by-line text file display in wxpython

 
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  #8
Jun 28th, 2009
paulthom, thanks for your note. I learned most of the little I know about wxpython from your very practical tutorials on www.wxpython.webs.com/. The down-home language is entertaining and explicit. I like your layout on www.thecodecookie.com also, and am looking forward to seeing more. Thanks again!
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