wxPython/demo/EventManager.py

   1 #---------------------------------------------------------------------------
   2 # Name:        EventManager.py
   3 # Purpose:     A module to demonstrate wxPython.lib.evtmgr.EventManager.
   4 #
   5 # Author:      Robb Shecter (robb@acm.org)
   6 #
   7 # Created:     16-December-2002
   8 # Copyright:   (c) 2002 by Robb Shecter (robb@acm.org)
   9 # Licence:     wxWindows license
  10 #---------------------------------------------------------------------------
  11
  12 import  wx
  13 import  wx.lib.evtmgr   as  em
  14
  15 #----------------------------------------------------------------------
  16
  17 class TestPanel(wx.Panel):
  18     def __init__(self, parent, log):
  19         wx.Panel.__init__(self, parent, -1)
  20         self.log = log
  21
  22         fsize    = self.GetFont().GetPointSize()
  23         f1 = wx.Font(fsize+0, wx.SWISS, wx.NORMAL, wx.NORMAL)
  24         f2 = wx.Font(fsize+2, wx.SWISS, wx.NORMAL, wx.BOLD)
  25         f3 = wx.Font(fsize+6, wx.SWISS, wx.NORMAL, wx.BOLD)
  26
  27         title1 = wx.StaticText(self, -1, 'EventManager')
  28         title1.SetFont(f3)
  29         txt = """\
  30         This demo shows  (1) basic uses and features of the EventManager, as well
  31         as  (2) how it helps with a real-world task: creating independent, object-
  32         oriented components."""
  33         message0 = wx.StaticText(self, -1, txt)
  34         message0.SetFont(f1)
  35
  36         title2 = wx.StaticText(self, -1, 'Event Listeners')
  37         title2.SetFont(f2)
  38
  39         txt = """\
  40         These objects listen to motion events from the target window, using the ability
  41         to register one event with multiple listeners.  They also register for mouse events
  42         on themselves to implement toggle-button functionality."""
  43         message1 = wx.StaticText(self, -1, txt)
  44         message1.SetFont(f1)
  45
  46         title3 = wx.StaticText(self, -1, 'Target Window')
  47         title3.SetFont(f2)
  48
  49         txt = """\
  50         A passive window that's used as an event generator.  Move the mouse over it to
  51         send events to the listeners above."""
  52         message2 = wx.StaticText(self, -1, txt)
  53         message2.SetFont(f1)
  54
  55         targetPanel = Tile(self, log, bgColor=wx.Colour(80,10,10), active=0)
  56         buttonPanel = wx.Panel(self ,-1)
  57         sizer       = wx.BoxSizer(wx.HORIZONTAL)
  58         target      = targetPanel.tile
  59
  60         sizer.Add((0,0), 1)
  61         for factor in [0.2, 0.3, 0.4, 0.5, 0.6, 0.7]:
  62             sizer.Add(Tile(buttonPanel, log, factor-0.05, target), 0, wx.ALIGN_CENTER)
  63             sizer.Add((0,0),1)
  64             sizer.Add(Tile(buttonPanel, log, factor,      target), 0, wx.ALIGN_CENTER)
  65             sizer.Add((0,0),1)
  66
  67         buttonPanel.SetAutoLayout(1)
  68         buttonPanel.SetSizer(sizer)
  69         sizer.Fit(buttonPanel)
  70
  71         sizer = wx.BoxSizer(wx.VERTICAL)
  72         sizer.Add(title1,      0, wx.ALIGN_CENTER | wx.TOP | wx.BOTTOM, 6)
  73         sizer.Add(message0,    0, wx.ALIGN_CENTER | wx.ALL, 6)
  74         sizer.Add(title2,      0, wx.ALIGN_CENTER | wx.LEFT | wx.TOP    | wx.RIGHT, 16)
  75         sizer.Add(message1,    0, wx.ALIGN_CENTER | wx.ALL, 6)
  76         sizer.Add(buttonPanel, 0, wx.EXPAND       | wx.LEFT | wx.BOTTOM | wx.RIGHT, 16)
  77         sizer.Add(title3,      0, wx.ALIGN_CENTER | wx.LEFT | wx.RIGHT, 16)
  78         sizer.Add(message2,    0, wx.ALIGN_CENTER | wx.ALL, 6)
  79         sizer.Add(targetPanel, 2, wx.EXPAND       | wx.LEFT | wx.BOTTOM | wx.RIGHT, 16)
  80         self.SetAutoLayout(1)
  81         self.SetSizer(sizer)
  82
  83
  84
  85 class Tile(wx.Panel):
  86     """
  87     This outer class is responsible for changing
  88     its border color in response to certain mouse
  89     events over its contained 'InnerTile'.
  90     """
  91     normal = wx.Colour(150,150,150)
  92     active = wx.Colour(250,245,245)
  93     hover  = wx.Colour(210,220,210)
  94
  95     def __init__(self, parent, log, factor=1, thingToWatch=None, bgColor=None, active=1, size=(38,38), borderWidth=3):
  96         wx.Panel.__init__(self, parent, -1, size=size, style=wx.CLIP_CHILDREN)
  97         self.tile = InnerTile(self, log, factor, thingToWatch, bgColor)
  98         self.log  = log
  99         sizer = wx.BoxSizer(wx.HORIZONTAL)
 100         sizer.Add(self.tile, 1, wx.EXPAND | wx.ALL, borderWidth)
 101         self.SetAutoLayout(1)
 102         self.SetSizer(sizer)
 103         self.Layout()
 104         self.SetBackgroundColour(Tile.normal)
 105         if active:
 106             # Register myself for mouse events over self.tile in order to
 107             # create typical button/hyperlink visual effects.
 108             em.eventManager.Register(self.setHover,  wx.EVT_ENTER_WINDOW, self.tile)
 109             em.eventManager.Register(self.setNormal, wx.EVT_LEAVE_WINDOW, self.tile)
 110             em.eventManager.Register(self.setActive, wx.EVT_LEFT_DOWN,    self.tile)
 111             em.eventManager.Register(self.setHover,  wx.EVT_LEFT_UP,      self.tile)
 112
 113
 114     def setHover(self, event):
 115         self.SetBackgroundColour(Tile.hover)
 116         self.Refresh()
 117
 118
 119     def setActive(self, event):
 120         self.SetBackgroundColour(Tile.active)
 121         self.Refresh()
 122
 123
 124     def setNormal(self, event):
 125         self.SetBackgroundColour(Tile.normal)
 126         self.Refresh()
 127
 128
 129
 130 class InnerTile(wx.Panel):
 131     IDLE_COLOR  = wx.Colour( 80, 10, 10)
 132     START_COLOR = wx.Colour(200, 70, 50)
 133     FINAL_COLOR = wx.Colour( 20, 80,240)
 134     OFF_COLOR   = wx.Colour(185,190,185)
 135     # Some pre-computation.
 136     DELTAS            = map(lambda a,b: b-a, START_COLOR.Get(), FINAL_COLOR.Get())
 137     START_COLOR_TUPLE = START_COLOR.Get()
 138
 139     """
 140     This inner panel changes its color in reaction to mouse
 141     events over the 'thingToWatch'.
 142     """
 143     def __init__(self, parent, log, factor, thingToWatch=None, bgColor=None):
 144         wx.Panel.__init__(self, parent, -1)
 145         self.log=log
 146         if bgColor:
 147             self.SetBackgroundColour(bgColor)
 148         if thingToWatch:
 149             self.factor       = factor
 150             self.thingToWatch = thingToWatch
 151             self.state        = 0
 152             self.toggleOnOff()
 153             # Watch for the mouse click to enable/disable myself.
 154             em.eventManager.Register(self.toggleOnOff, wx.EVT_LEFT_UP, self)
 155
 156
 157     def toggleOnOff(self, event=None):
 158         # Implement being on or off by registering and
 159         # de-registering self.makeColor() from the event manager.
 160         if self.state:
 161             em.eventManager.DeregisterListener(self.makeColor)
 162         else:
 163             em.eventManager.Register(self.makeColor, wx.EVT_MOTION, self.thingToWatch)
 164         self.state = 1 - self.state
 165         self.resetColor()
 166
 167
 168     def resetColor(self, event=None):
 169         if self.state:
 170             self.setColor(InnerTile.IDLE_COLOR)
 171         else:
 172             self.setColor(InnerTile.OFF_COLOR)
 173
 174
 175     def setColor(self, color):
 176         self.SetBackgroundColour(color)
 177         self.Refresh()
 178
 179
 180     def makeColor(self, mouseEvent):
 181         self.makeColorFromTuple(mouseEvent.GetPositionTuple())
 182
 183
 184     def makeColorFromTuple(self, (x, y)):
 185         MAX     = 180.0
 186         scaled  = min((x + y) * self.factor, MAX)  # In range [0..MAX]
 187         percent = scaled / MAX
 188         r = InnerTile.START_COLOR_TUPLE[0] + (InnerTile.DELTAS[0] * percent)
 189         g = InnerTile.START_COLOR_TUPLE[1] + (InnerTile.DELTAS[1] * percent)
 190         b = InnerTile.START_COLOR_TUPLE[2] + (InnerTile.DELTAS[2] * percent)
 191         self.setColor(wx.Colour(int(r), int(g), int(b)))
 192
 193
 194
 195
 196 #----------------------------------------------------------------------
 197
 198 def runTest(frame, nb, log):
 199     win = TestPanel(nb, log)
 200     return win
 201
 202 #----------------------------------------------------------------------
 203
 204
 205
 206 overview = """<html><body>
 207 <h2>EventManager</h2>
 208
 209 <p> The goal of the EventManager is to make wxWindows events more
 210 'Pythonic' (ie. object-oriented) and easier to work with, without
 211 impacting performance.  It offers these features:
 212
 213 <p>
 214 <ul>
 215
 216     <li> Allows any number of listeners to register for a single
 217     event.  (In addition to the standard wxPython feature of a single
 218     listener being able to respond to many events.)
 219
 220     <li> Makes it easy to disconnect and reconnect listeners.  This
 221     has the effect of reducing the need for case-based branching in
 222     application code.
 223
 224     <li> Has an object-oriented API.  Programmers register to get
 225     events directly from the objects that generate them, instead of
 226     using ID numbers.
 227
 228 </ul>
 229
 230 <h3>Usage</h3>
 231
 232 <p>The EventManager class has three public methods.  First get a
 233 reference to it:
 234
 235 <PRE>
 236   from wxPython.lib.evtmgr import eventManager
 237 </PRE>
 238
 239 <p>...and then invoke any of the following methods.  These methods are
 240 'safe'; duplicate registrations or de-registrations will have no
 241 effect.
 242
 243 <p><b>Registering a listener:</b>
 244
 245 <PRE>
 246   eventManager.Register(listener, event, event-source)
 247 </PRE>
 248
 249
 250 <p><b>De-registering by window:</b>
 251
 252 <PRE>
 253   eventManager.DeregisterWindow(event-source)
 254 </PRE>
 255
 256
 257 <p><b>De-registering by listener:</b>
 258
 259 <PRE>
 260   eventManager.DeregisterListener(listener)
 261 </PRE>
 262
 263 <p><b>Simple Example:</b>
 264
 265 <PRE>
 266   from wxPython.lib.evtmgr import eventManager
 267
 268   aButton = wxButton(somePanel, -1, 'Click me')
 269   eventManager.Register(self.someMethod, EVT_BUTTON, aButton)
 270 </PRE>
 271
 272 <p> See the demo code as well as the documentation in the source of
 273 <tt>wxPython.lib.evtmgr</tt> for more details.
 274
 275
 276 <p>
 277 by Robb Shecter (robb@acm.org)
 278 </body></html>
 279 """
 280
 281
 282
 283 if __name__ == '__main__':
 284     import sys,os
 285     import run
 286     run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
 287