1 # A very simple Drag and Drop Example
   2 # provided with no warranty whatsoever for any purpose, ever
   3 
   4 # A very simple Drag and Drop Example
   5 # provided with no warranty whatsoever for any purpose, ever
   6 
   7 # This code creates a Text Control from which Text can be dragged,
   8 # a Text Control to which Text can be dragged (from the first Text Control or from other applications),
   9 # and a Text Control to which Files can be dragged from outside this application.
  10 # While the later two windows can receive data from outside the application, the first window
  11 # does not appear to be able to provide text to other applications.  Please feel free to fix
  12 # this if you know how, as I think that would be more useful as an example.
  13 
  14 # It is designed to demonstrate the fundamentals of very simple drag-and-drop operations.
  15 
  16 """ This mini-ap is designed to demonstrate simple Drag and Drop functioning in wx.Python """
  17 
  18 __author__ = 'David Woods, Wisconsin Center for Education Research <dwoods@wcer.wisc.edu>'
  19 
  20 # Import wx.Python
  21 import wx
  22 
  23 # Declare GUI Constants
  24 MENU_FILE_EXIT = wx.NewId()
  25 DRAG_SOURCE    = wx.NewId()
  26 
  27 # Define Text Drop Target class
  28 class TextDropTarget(wx.TextDropTarget):
  29    """ This object implements Drop Target functionality for Text """
  30    def __init__(self, obj):
  31       """ Initialize the Drop Target, passing in the Object Reference to
  32           indicate what should receive the dropped text """
  33       # Initialize the wx.TextDropTarget Object
  34       wx.TextDropTarget.__init__(self)
  35       # Store the Object Reference for dropped text
  36       self.obj = obj
  37 
  38    def OnDropText(self, x, y, data):
  39       """ Implement Text Drop """
  40       # When text is dropped, write it into the object specified
  41       self.obj.WriteText(data + '\n\n')
  42 
  43 # Define File Drop Target class
  44 class FileDropTarget(wx.FileDropTarget):
  45    """ This object implements Drop Target functionality for Files """
  46    def __init__(self, obj):
  47       """ Initialize the Drop Target, passing in the Object Reference to
  48           indicate what should receive the dropped files """
  49       # Initialize the wsFileDropTarget Object
  50       wx.FileDropTarget.__init__(self)
  51       # Store the Object Reference for dropped files
  52       self.obj = obj
  53 
  54    def OnDropFiles(self, x, y, filenames):
  55       """ Implement File Drop """
  56       # For Demo purposes, this function appends a list of the files dropped at the end of the widget's text
  57       # Move Insertion Point to the end of the widget's text
  58       self.obj.SetInsertionPointEnd()
  59       # append a list of the file names dropped
  60       self.obj.WriteText("%d file(s) dropped at %d, %d:\n" % (len(filenames), x, y))
  61       for file in filenames:
  62          self.obj.WriteText(file + '\n')
  63       self.obj.WriteText('\n')
  64 
  65 
  66 
  67 class MainWindow(wx.Frame):
  68    """ This window displays the GUI Widgets. """
  69    def __init__(self,parent,id,title):
  70        wx.Frame.__init__(self,parent,-4, title, size = (800,600), style=wx.DEFAULT_FRAME_STYLE|wx.NO_FULL_REPAINT_ON_RESIZE)
  71        self.SetBackgroundColour(wx.WHITE)
  72 
  73        # Menu Bar
  74        # Create a MenuBar
  75        menuBar = wx.MenuBar()
  76        # Build a Menu Object to go into the Menu Bar
  77        menu1 = wx.Menu()
  78        menu1.Append(MENU_FILE_EXIT, "E&xit", "Quit Application")
  79        # Place the Menu Item in the Menu Bar
  80        menuBar.Append(menu1, "&File")
  81        # Place the Menu Bar on the ap
  82        self.SetMenuBar(menuBar)
  83        #Define Events for the Menu Items
  84        wx.EVT_MENU(self, MENU_FILE_EXIT, self.CloseWindow)
  85 
  86        # GUI Widgets
  87        # Define a Text Control from which Text can be dragged for dropping
  88        # Label the control
  89        wx.StaticText(self, -1, "Text Drag Source  (left-click to select, right-click to drag)", (10, 1))
  90        # Create a Text Control
  91        self.text = wx.TextCtrl(self, DRAG_SOURCE, "", pos=(10,15), size=(350,500), style = wx.TE_MULTILINE|wx.HSCROLL)
  92        # Make this control a Text Drop Target
  93        # Create a Text Drop Target object
  94        dt1 = TextDropTarget(self.text)
  95        # Link the Drop Target Object to the Text Control
  96        self.text.SetDropTarget(dt1)
  97        # Put some text in the control as a starting place to have something to copy
  98        for x in range(20):
  99           self.text.WriteText("This is line %d of some text to drag.\n" % x)
 100        # Define Right-Click as start of Drag
 101        wx.EVT_RIGHT_DOWN(self.text, self.OnDragInit)
 102 
 103        # Define a Text Control to recieve Dropped Text
 104        # Label the control
 105        wx.StaticText(self, -1, "Text Drop Target", (370, 1))
 106        # Create a read-only Text Control
 107        self.text2 = wx.TextCtrl(self, -1, "", pos=(370,15), size=(410,235), style = wx.TE_MULTILINE|wx.HSCROLL|wx.TE_READONLY)
 108        # Make this control a Text Drop Target
 109        # Create a Text Drop Target object
 110        dt2 = TextDropTarget(self.text2)
 111        # Link the Drop Target Object to the Text Control
 112        self.text2.SetDropTarget(dt2)
 113 
 114        # Define a Text Control to recieve Dropped Files
 115        # Label the control
 116        wx.StaticText(self, -1, "File Drop Target (from off application only)", (370, 261))
 117        # Create a read-only Text Control
 118        self.text3 = wx.TextCtrl(self, -1, "", pos=(370,275), size=(410,235), style = wx.TE_MULTILINE|wx.HSCROLL|wx.TE_READONLY)
 119        # Make this control a File Drop Target
 120        # Create a File Drop Target object
 121        dt3 = FileDropTarget(self.text3)
 122        # Link the Drop Target Object to the Text Control
 123        self.text3.SetDropTarget(dt3)
 124 
 125        # Display the Window
 126        self.Show(True)
 127 
 128 
 129    def CloseWindow(self, event):
 130        """ Close the Window """
 131        self.Close()
 132 
 133    def OnDragInit(self, event):
 134        """ Begin a Drag Operation """
 135        # Create a Text Data Object, which holds the text that is to be dragged
 136        tdo = wx.PyTextDataObject(self.text.GetStringSelection())
 137        # Create a Drop Source Object, which enables the Drag operation
 138        tds = wx.DropSource(self.text)
 139        # Associate the Data to be dragged with the Drop Source Object
 140        tds.SetData(tdo)
 141        # Intiate the Drag Operation
 142        tds.DoDragDrop(True)
 143 
 144 
 145 
 146 class MyApp(wx.App):
 147    """ Define the Drag and Drop Example Application """
 148    def OnInit(self):
 149       """ Initialize the Application """
 150       # Declare the Main Application Window
 151       frame = MainWindow(None, -1, "Drag and Drop Example")
 152       # Show the Application as the top window
 153       self.SetTopWindow(frame)
 154       return True
 155 
 156 
 157 # Declare the Application and start the Main Loop
 158 app = MyApp(0)
 159 app.MainLoop()