Source Code for Module pyjamas.Canvas2D

  1  # Canvas wrapper component for Pyjamas 
  2  # Ported by Willie Gollino from Canvas component for GWT - Originally by Alexei Sokolov http://gwt.components.googlepages.com/ 
  3  # 
  4  # Canvas API reference: 
  5  # http://developer.apple.com/documentation/AppleApplications/Reference/SafariJSRef/Classes/Canvas.html#//apple_ref/js/Canvas.clearRect 
  6  # 
  7  # Usage Notes: 
  8  #   - IE support requires ExplorerCanvas from excanvas.sourceforge.net 
  9  #   - place excanvas.js in your apps public folder 
 10  #   - add this to your MainModule.html: <!--[if IE]><script src="excanvas.js" type="text/javascript"></script><![endif]--> 
 11   
 12  from pyjamas import DOM 
 13  from pyjamas.ui.Image import Image 
 14  from pyjamas.ui.FocusWidget import FocusWidget 
 15  from pyjamas.ui import Event 
 16  from pyjamas.ui import MouseListener 
 17  from pyjamas.ui import KeyboardListener 
 18  from pyjamas.ui import Focus 
 19  from pyjamas.ui import FocusListener 
 20   
 21  from __pyjamas__ import JS 
 22   
 23 -class Canvas(FocusWidget): 
 24 -    def __init__(self, Width=0, Height=0, **kwargs): 
 25          if not kwargs.has_key('StyleName'): 
 26              kwargs['StyleName'] = 'gwt-Canvas' 
 27          kwargs['Width'] = Width 
 28          kwargs['Height'] = Height 
 29   
 30          self.context = None 
 31          
 32          focusable = Focus.createFocusable()  
 33          self.canvas = DOM.createElement("canvas") 
 34          DOM.appendChild(focusable, self.canvas) 
 35          FocusWidget.__init__(self, focusable, **kwargs) 
 36           
 37          self.init() 
 38           
 39          self.context.fillStyle = "black" 
 40          self.context.strokeStyle = "black" 
 41   
 42 -    def setWidth(self, width): 
 43          FocusWidget.setWidth(self, width) 
 44          self.canvas.width = width 
 45   
 46 -    def setHeight(self, height): 
 47          FocusWidget.setHeight(self, height) 
 48          self.canvas.height = height 
 49   
 50 -    def getContext(self): 
 51          return self.context 
 52   
 53 -    def isEmulation(self): 
 54          return False 
 55   
 56 -    def init(self): 
 57          el = self.getElement().firstChild 
 58          ctx = el.getContext("2d") 
 59           
 60          """ 
 61          ctx._createPattern = ctx.createPattern 
 62          ctx.createPattern = function(img, rep) { 
 63              if (!(img instanceof Image)) img = img.getElement();  
 64              return self._createPattern(img, rep) 
 65              } 
 66   
 67          ctx._drawImage = ctx.drawImage 
 68          ctx.drawImage = function() { 
 69              var a=arguments 
 70              if (!(a[0] instanceof Image)) a[0] = a[0].getElement() 
 71              if (a.length==9) return self._drawImage(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]) 
 72              else if (a.length==5) return self._drawImage(a[0], a[1], a[2], a[3], a[4]) 
 73              return self._drawImage(a[0], a[1], a[2]) 
 74              } 
 75          """ 
 76          self.context = ctx 
 77   
 78 -class CanvasImage(Image): 
 79 -    def __init__(self, url="", load_listener = None): 
 80          Image.__init__(self, url) 
 81          if load_listener: 
 82              self.addLoadListener(load_listener)      
 83          self.onAttach() 
 84   
 85 -    def isLoaded(self): 
 86          return self.getElement().complete 
 87   
 88   
 89 -class ImageLoadListener: 
 90 -    def __init__(self, listener = None): 
 91          self.wait_list = [] 
 92          self.loadListeners = [] 
 93           
 94          if listener: 
 95              self.addLoadListener(listener)   
 96   
 97 -    def add(self, sender): 
 98          self.wait_list.append(sender) 
 99          sender.addLoadListener(self) 
100       
101 -    def addLoadListener(self, listener): 
102          self.loadListeners.append(listener) 
103   
104 -    def isLoaded(self): 
105          if len(self.wait_list): 
106              return False 
107          return True 
108   
109 -    def onError(self, sender): 
110          for listener in self.loadListeners: 
111              listener.onError(sender) 
112           
113 -    def onLoad(self, sender): 
114          self.wait_list.remove(sender) 
115           
116          if self.isLoaded(): 
117              for listener in self.loadListeners: 
118                  listener.onLoad(self) 
119