Merge branch 'master' of https://github.com/PythonCHB/PythonCertSpring

Author: Chris Barker

week-09/code/basic_app_3.py

@@ -0,0 +1,201 @@
+#!/usr/bin/env python
+
+"""
+Example of the very basic, minimal farmework for a wxPython application
+
+This version adds a basic menu bar with a file menu
+"""
+
+import wx
+import os
+
+#---------------------------------------------------------------------------
+
+# This is how you pre-establish a file filter so that the dialog
+# only shows the extension(s) you want it to.
+wildcard = "Python source (*.py)|*.py|"     \
+           "Compiled Python (*.pyc)|*.pyc|" \
+           "SPAM files (*.spam)|*.spam|"    \
+           "Egg file (*.egg)|*.egg|"        \
+           "All files (*.*)|*.*"
+
+#---------------------------------------------------------------------------
+
+
+class AppLogic(object):
+    """
+    A class to hold the application Application Logic.
+
+    You generally don't want the real logic of the app mixed
+    in with the GUI
+
+    In a real app, this would be a substantial collection of 
+    modules, classes, etc...
+    """
+
+    def file_open(self, filename="default_name"):
+        """This method opens a file"""
+        print "Open a file: "
+        print "I'd be opening file: %s now"%filename
+
+    def file_close(self):
+        """This method closes a file"""
+        print "Close a file: "
+        print "I'd be closing a file now"
+ 
+
+
+class TestFrame(wx.Frame):
+    def __init__(self, app_logic, *args, **kwargs):
+        kwargs.setdefault('title', "Simple test App")
+        wx.Frame.__init__(self, *args, **kwargs)
+
+        self.app_logic = app_logic
+
+        # Add a panel so it looks the correct on all platforms
+        self.panel = wx.Panel(self, wx.ID_ANY)
+ 
+
+        # Build up the menu bar:
+        menuBar = wx.MenuBar()
+        
+        fileMenu = wx.Menu()
+        
+        newMenuItem = fileMenu.Append(wx.ID_ANY, "&New", "Create a new file")
+        self.Bind(wx.EVT_MENU, self.onNew, newMenuItem )
+        
+        openMenuItem = fileMenu.Append(wx.ID_ANY, "&Open", "Open an existing file" )
+        self.Bind(wx.EVT_MENU, self.onOpen, openMenuItem)
+
+        closeMenuItem = fileMenu.Append(wx.ID_ANY, "&Close", "Close a file" )
+        self.Bind(wx.EVT_MENU, self.onClose, closeMenuItem)
+
+        exitMenuItem = fileMenu.Append(wx.ID_EXIT, "Exit", "Exit the application")
+        self.Bind(wx.EVT_MENU, self.onExit, exitMenuItem)
+        menuBar.Append(fileMenu, "&File")
+        
+        helpMenu = wx.Menu()
+        helpMenuItem = helpMenu.Append(wx.ID_HELP, "Help", "Get help")
+        menuBar.Append(helpMenu, "&Help")
+
+        self.SetMenuBar(menuBar)
+
+#    def onNew (self, evt=None):
+#        print "Create menu selected"
+#        self.file_create()
+        
+#   def onOpen(self, evt=None):
+#        print "open menu selected"
+
+    def onClose(self, evt=None):
+        print "close menu selected"
+        self.file_close()
+
+    def onExit(self, evt=None):
+        print "Exit the program here"
+        print "The event passed to onExit is type ", type(evt),
+        self.Close()
+
+    def onNew ( self, evt=None ):
+        """This method creates a new file"""
+
+        # Create the dialog. In this case the current directory is forced as the starting
+        # directory for the dialog, and no default file name is forced. This can easilly
+        # be changed in your program. This is an 'save' dialog.
+        #
+        # Unlike the 'open dialog' example found elsewhere, this example does NOT
+        # force the current working directory to change if the user chooses a different
+        # directory than the one initially set.
+        dlg = wx.FileDialog(
+            self, message="Save file as ...", defaultDir=os.getcwd(), 
+            defaultFile="", wildcard=wildcard, style=wx.SAVE )
+
+        # This sets the default filter that the user will initially see. Otherwise,
+        # the first filter in the list will be used by default.
+        dlg.SetFilterIndex(2)
+
+        # Show the dialog and retrieve the user response. If it is the OK response, 
+        # process the data.
+        if dlg.ShowModal() == wx.ID_OK:
+            path = dlg.GetPath()
+
+            # Normally, at this point you would save your data using the file and path
+            # data that the user provided to you, but since we didn't actually start
+            # with any data to work with, that would be difficult.
+            # 
+            # The code to do so would be similar to this, assuming 'data' contains
+            # the data you want to save:
+            #
+            # fp = file(path, 'w') # Create file anew
+            # fp.write(data)
+            # fp.close()
+            #
+            # You might want to add some error checking :-)
+            #
+
+        # Note that the current working dir didn't change. This is good since
+        # that's the way we set it up.
+
+        # Destroy the dialog. Don't do this until you are done with it!
+        # BAD things can happen otherwise!
+        dlg.Destroy()
+
+        
+
+    
+    def onOpen(self, evt=None):
+        """This method opens an existing file"""
+        print "Open a file: "
+        # Create the dialog. In this case the current directory is forced as the starting
+        # directory for the dialog, and no default file name is forced. This can easilly
+        # be changed in your program. This is an 'open' dialog, and allows multitple
+        # file selections as well.
+        #
+        # Finally, if the directory is changed in the process of getting files, this
+        # dialog is set up to change the current working directory to the path chosen.
+        dlg = wx.FileDialog(
+            self, message="Choose a file",
+            defaultDir=os.getcwd(), 
+            defaultFile="",
+            wildcard=wildcard,
+            style=wx.OPEN | wx.CHANGE_DIR
+            )
+
+        # Show the dialog and retrieve the user response. If it is the OK response, 
+        # process the data.
+        if dlg.ShowModal() == wx.ID_OK:
+            # This returns a Python list of files that were selected.
+            path = dlg.GetPath()
+
+
+
+
+        # Destroy the dialog. Don't do this until you are done with it!
+        # BAD things can happen otherwise!
+        dlg.Destroy()
+
+        print "I'd be opening file in onOpen ", path
+        self.app_logic.file_open( path )
+
+    def file_close(self):
+        """This method closes a file"""
+        print "Close a file: "
+        print "I'd be closing a file now"
+ 
+
+class TestApp(wx.App):
+    def OnInit(self):
+        """
+        App initilization goes here -- not much to do, in this case
+        """
+        app_logic = AppLogic()
+        f = TestFrame(app_logic, parent=None)
+#        assert isinstance(f, wxWindow)
+        f.Show()
+
+        return True
+
+if __name__ == "__main__":
+    app = TestApp()
+    app.MainLoop()
+