wxPython/wx/lib/gestures.py

   1 #Mouse Gestures
   2
   3 #Version 0.0.1
   4
   5 #By Daniel Pozmanter
   6 #drpython@bluebottle.com
   7
   8 #Released under the terms of the wxWindows License.
   9
  10 """
  11 This is a class to add Mouse Gestures to a program.
  12 It can be used in two ways:
  13
  14 1.  Automatic:
  15     Automatically runs mouse gestures.
  16     You need to set the gestures, and their associated actions,
  17     as well as the Mouse Button/Modifiers to use.
  18
  19 2.  Manual:
  20     Same as above, but you do not need to set the mouse button/modifiers.
  21     You can launch this from events as you wish.
  22
  23 An example is provided in the demo.
  24 The parent window is where the mouse events will be recorded.
  25 (So if you want to record them in a pop up window, use manual mode,
  26 and set the pop up as the parent).
  27
  28 Start() starts recording mouse movement.
  29 End() stops the recording, compiles all the gestures into a list,
  30 and looks through the registered gestures to find a match.
  31 The first matchs associated    action is then run.
  32
  33 The marginoferror is how much to forgive when calculating movement:
  34 If the margin is 25, then movement less than 25 pixels will not be detected.
  35
  36 Recognized:  L, R, U, D, 1, 3, 7, 9
  37
  38 Styles:  Manual (Automatic By Default), DisplayNumbersForDiagonals (Off By Default).
  39 Not Yet Implemented
  40
  41 The criteria for a direction is as follows:
  42 x in a row.  (Where x is the WobbleTolerance).
  43 So if the WobbleTolerance is 9
  44 'URUUUUUUUUUUUUUUURUURUUUU1' is Up.
  45
  46 The higher this number, the less sensitive this class is.
  47 So the more likely something like 1L will translate to 1.
  48
  49 This is good, since the mouse does tend to wobble somewhat,
  50 and a higher number allows for this.
  51
  52 To change this, use SetWobbleTolerance
  53
  54 Also, to help with recognition of a diagonal versus
  55 a vey messy straight line, if the greater absolute value
  56 is not greater than twice the lesser, only the grater value
  57 is counted.
  58
  59 In automatic mode, EVT_MOUSE_EVENTS is used.
  60 This allows the user to change the mouse button/modifiers at runtime.
  61 """
  62
  63 ###########################################
  64
  65 '''
  66 Changelog:
  67 0.0.1:  Treats a mouse leaving event as mouse up.
  68         (Bug Report, Thanks Peter Damoc).
  69
  70
  71 0.0.0:  Initial Release.
  72 '''
  73
  74 ###########################################
  75 #ToDo:
  76
  77 #Fully Implement Manual Mode
  78
  79 #Add "Ends With":  AddGestureEndsWith(self, gesture, action, args)
  80 #Add "Starts With":  AddGestuteStartsWith(self, gesture, action, args)
  81
  82 #For better control of when the gesture starts and stops,
  83 #use manual mode.
  84 #At the moment, you need to Bind the OnMouseMotion event if you want to use
  85 #manual mode.
  86
  87 import wx
  88
  89 class MouseGestures:
  90     def __init__(self, parent, Auto=True, MouseButton=wx.MOUSE_BTN_MIDDLE):
  91         self.parent = parent
  92
  93         self.gestures = []
  94         self.actions = []
  95         self.actionarguments = []
  96
  97         self.mousebutton = MouseButton
  98         self.modifiers = []
  99
 100         self.recording = False
 101
 102         self.lastposition = (-1, -1)
 103
 104         self.pen = wx.Pen(wx.Colour(0, 144, 255), 5)
 105
 106         self.dc = wx.ScreenDC()
 107         self.dc.SetPen(self.pen)
 108
 109         self.showgesture = False
 110
 111         self.wobbletolerance = 7
 112
 113         self.rawgesture = ''
 114
 115         self.SetAuto(Auto)
 116
 117     def _check_modifiers(self, event):
 118         '''Internal:  Returns True if all needed modifiers are down
 119         for the given event.'''
 120         if len(self.modifiers) > 0:
 121             good = True
 122             if wx.WXK_CONTROL in self.modifiers:
 123                 good = good and event.ControlDown()
 124             if wx.WXK_SHIFT in self.modifiers:
 125                 good = good and event.ShiftDown()
 126             if wx.WXK_ALT in self.modifiers:
 127                 good = good and event.AltDown()
 128             return good
 129         return True
 130
 131     def AddGesture(self, gesture, action, *args):
 132         '''Registers a gesture, and an associated function, with any arguments needed.'''
 133         #Make Sure not a duplicate:
 134         self.RemoveGesture(gesture)
 135
 136         self.gestures.append(gesture)
 137         self.actions.append(action)
 138         self.actionarguments.append(args)
 139
 140     def DoAction(self, gesture):
 141         '''If the gesture is in the array of registered gestures, run the associated function.'''
 142         if gesture in self.gestures:
 143             i = self.gestures.index(gesture)
 144             apply(self.actions[i], self.actionarguments[i])
 145
 146     def End(self):
 147         '''Stops recording the points to create the mouse gesture from,
 148         and creates the mouse gesture, returns the result as a string.'''
 149         self.recording = False
 150
 151         #Figure out the gestures (Look for occurances of 5 in a row or more):
 152
 153         tempstring = '0'
 154         possiblechange = '0'
 155
 156         directions = ''
 157
 158         for g in self.rawgesture:
 159             l = len(tempstring)
 160             if g != tempstring[l - 1]:
 161                 if g == possiblechange:
 162                     tempstring = g + g
 163                 else:
 164                     possiblechange = g
 165             else:
 166                 tempstring += g
 167             if len(tempstring) >= self.wobbletolerance:
 168                 ld = len(directions)
 169                 if ld > 0:
 170                     if directions[ld - 1] != g:
 171                         directions += g
 172                 else:
 173                     directions += g
 174                 tempstring = '0'
 175
 176         if self.showgesture:
 177             self.parent.Refresh()
 178
 179         return directions
 180
 181     def GetDirection(self, point1, point2):
 182         '''Gets the direction between two points.'''
 183         #point1 is the old point
 184         #point2 is current
 185
 186         x1, y1 = point1
 187         x2, y2 = point2
 188
 189         #(Negative = Left, Up)
 190         #(Positive = Right, Down)
 191
 192         horizontal = x2 - x1
 193         vertical = y2 - y1
 194
 195         horizontalchange = abs(horizontal) > 0
 196         verticalchange = abs(vertical) > 0
 197
 198         if horizontalchange and verticalchange:
 199             ah = abs(horizontal)
 200             av = abs(vertical)
 201             if ah > av:
 202                 if (ah / av) > 2:
 203                     vertical = 0
 204                     verticalchange = False
 205             elif av > ah:
 206                 if (av / ah) > 2:
 207                     horizontal = 0
 208                     horizontalchange = False
 209
 210         if horizontalchange and verticalchange:
 211             #Diagonal
 212             if (horizontal > 0) and (vertical > 0):
 213                 return '3'
 214             elif (horizontal > 0) and (vertical < 0):
 215                 return '9'
 216             elif (horizontal < 0) and (vertical > 0):
 217                 return '1'
 218             else:
 219                 return '7'
 220         else:
 221             #Straight Line
 222             if horizontalchange:
 223                 if horizontal > 0:
 224                     return 'R'
 225                 else:
 226                     return 'L'
 227             else:
 228                 if vertical > 0:
 229                     return 'D'
 230                 else:
 231                     return 'U'
 232
 233     def GetRecording(self):
 234         '''Returns whether or not Gesture Recording has started.'''
 235         return self.recording
 236
 237     def OnMotion(self, event):
 238         '''Internal.  Used if Start() has been run'''
 239         if self.recording:
 240             currentposition = event.GetPosition()
 241             if self.lastposition != (-1, -1):
 242                 self.rawgesture += self.GetDirection(self.lastposition, currentposition)
 243                 if self.showgesture:
 244                     #Draw it!
 245                     px1, py1 = self.parent.ClientToScreen(self.lastposition)
 246                     px2, py2 = self.parent.ClientToScreen(currentposition)
 247                     self.dc.DrawLine(px1, py1, px2, py2)
 248
 249             self.lastposition = currentposition
 250
 251         event.Skip()
 252
 253     def OnMouseEvent(self, event):
 254         '''Internal.  Used in Auto Mode.'''
 255         if event.ButtonDown(self.mousebutton) and self._check_modifiers(event):
 256             self.Start()
 257         elif (event.ButtonUp(self.mousebutton) or event.Leaving()) and self.GetRecording():
 258             result = self.End()
 259             self.DoAction(result)
 260         event.Skip()
 261
 262     def RemoveGesture(self, gesture):
 263         '''Removes a gesture, and its associated action'''
 264         if gesture in self.gestures:
 265             i = self.gestures.index(gesture)
 266
 267             del self.gestures[i]
 268             del self.actions[i]
 269             del self.actionarguments[i]
 270
 271     def SetAuto(self, auto):
 272         '''Warning:  Once auto is set, it stays set, unless you manually use UnBind'''
 273         if auto:
 274             self.parent.Bind(wx.EVT_MOUSE_EVENTS, self.OnMouseEvent)
 275             self.parent.Bind(wx.EVT_MOTION, self.OnMotion)
 276
 277     def SetGesturePen(self, pen):
 278         '''Sets the wx pen used to visually represent each gesture'''
 279         self.pen = pen
 280         self.dc.SetPen(self.pen)
 281
 282     def SetGesturePen(self, colour, width):
 283         '''Sets the colour and width of the line drawn to visually represent each gesture'''
 284         self.pen = wx.Pen(colour, width)
 285         self.dc.SetPen(self.pen)
 286
 287     def SetGesturesVisible(self, vis):
 288         '''Sets whether a line is drawn to visually represent each gesture'''
 289         self.showgesture = vis
 290
 291     def SetModifiers(self, modifiers=[]):
 292         '''Takes an array of wx Key constants (Control, Shift, and/or Alt).
 293         Leave empty to unset all modifiers.'''
 294         self.modifiers = modifiers
 295
 296     def SetMouseButton(self, mousebutton):
 297         '''Takes the wx constant for the target mousebutton'''
 298         self.mousebutton = mousebutton
 299
 300     def SetWobbleTolerance(self, wobbletolerance):
 301         '''Sets just how much wobble this class can take!'''
 302         self.WobbleTolerance = wobbletolerance
 303
 304     def Start(self):
 305         '''Starts recording the points to create the mouse gesture from'''
 306         self.recording = True
 307         self.rawgesture = ''
 308         self.lastposition = (-1, -1)
 309         if self.showgesture:
 310             self.parent.Refresh()