Source Code for Module library.pyjamas.ui.DoubleControl

  1  """ Control Widgets.  Presently comprises a Vertical Slider Demo and derivatives. 
  2   
  3      HorizontalDemoSlider and HorizontalDemoSlider2 added by Bill Winder 
  4      AreaDemoSlider and AreaDemoSlider2 added by Bill Winder 
  5   
  6      Copyright (C) 2008, 2009, 2010 Luke Kenneth Casson Leighton <lkcl@lkcl.net> 
  7      Copyright (C) 2010 - Cedric Gestes <gestes@aldebaran-robotics.com> 
  8      Copyright (C) 2009, 2010 - Bill Winder <wgwinder@gmail.com> 
  9   
 10   
 11      To do: All controls with draggable=True do not fire the OnFocus methon on single click. 
 12      the control does not activate the OnFocus method. Clicking the handle does fire OnFocus, however. 
 13   
 14  """ 
 15   
 16  from pyjamas import Factory 
 17  import math 
 18  from pyjamas import DOM 
 19  from pyjamas.ui.FocusWidget import FocusWidget 
 20  from pyjamas.ui import Focus 
 21  from pyjamas.ui.MouseListener import MouseHandler 
 22  from pyjamas.ui import KeyboardListener 
 23  from pyjamas.ui.Control import Control 
 24   
 25   
 26 -class DoubleControl(Control): 
 27   
 28 -    def __init__(self, element, min_value, max_value, 
 29                         start_value_xy=None, step_xy=None, **kwargs): 
 30   
 31          self.min_value_x = min_value[0] 
 32          self.min_value_y = min_value[1] 
 33   
 34          self.max_value_x = max_value[0] 
 35          self.max_value_y = max_value[1] 
 36   
 37          if start_value_xy is None: 
 38              self.start_value_x = self.min_value_x 
 39              self.start_value_y = self.min_value_y 
 40          else: 
 41              self.start_value_x = start_value_xy[0] 
 42              self.start_value_y = start_value_xy[1] 
 43   
 44          if step_xy is None: 
 45              self.step_x = (self.max_value_x - self.min_value_x) / 20 
 46              self.step_y = (self.max_value_y - self.min_value_y) / 20 
 47          else: 
 48              self.step_x = step_xy[0] 
 49              self.step_y = step_xy[1] 
 50   
 51          self.value_x = self.start_value_x 
 52          self.value_y = self.start_value_y 
 53   
 54          self.valuechange_listeners = [] 
 55          self.dragging = False 
 56          self.drag_enabled = False 
 57   
 58          if not kwargs.has_key("TabIndex"): kwargs['TabIndex'] = 0 
 59          FocusWidget.__init__(self, element, **kwargs) 
 60          MouseHandler.__init__(self) 
 61   
 62 -    def processValue(self, value): 
 63   
 64          """ rounds and limits the value to acceptable range 
 65          """ 
 66          value_x = value[0] 
 67          value_y = value[1] 
 68   
 69          value_x = math.floor((value_x - self.min_value_x) / self.step_x) 
 70          value_x = (value_x * self.step_x) + self.min_value_x 
 71          value_x = max(value_x, self.min_value_x) 
 72          value_x = min(value_x, self.max_value_x) 
 73   
 74          value_y = math.floor((value_y - self.min_value_y) / self.step_y) 
 75          value_y = (value_y * self.step_y) + self.min_value_y 
 76          value_y = max(value_y, self.min_value_y) 
 77          value_y = min(value_y, self.max_value_y) 
 78   
 79          return [value_x, value_y] 
 80   
 81 -    def setValue(self, (new_value_x,new_value_y), notify=1): 
 82   
 83          old_value = [self.value_x, self.value_y] 
 84   
 85          self.value_x = new_value[0] 
 86          self.value_y = new_value[1] 
 87   
 88          if not notify: 
 89              return 
 90   
 91          for listener in self.valuechange_listeners: 
 92              listener.onControlValueChanged(self, old_value, new_value) 
 93   
 94 -    def onControlValueChanged(self, value_old_xy, value_new_xy): 
 95          pass 
 96   
 97 -    def onKeyDown(self, sender, keycode, modifiers): 
 98          if keycode == KeyboardListener.KEY_UP: 
 99              DOM.eventPreventDefault(DOM.eventGetCurrentEvent()) 
100              new_value = \ 
101                  self.processValue((self.value_x + self.step_x, 
102                                     self.value_y + self.step_y)) 
103              self.setControlPos(new_value) 
104              self.setValue(new_value) 
105          elif keycode == KeyboardListener.KEY_DOWN: 
106              DOM.eventPreventDefault(DOM.eventGetCurrentEvent()) 
107              new_value = \ 
108                 self.processValue((self.value_x - self.step_x, 
109                                    self.value_y-self.step_y)) 
110              self.setControlPos(new_value) 
111              self.setValue(new_value) 
112   
113  Factory.registerClass('pyjamas.ui.DoubleControl', 'DoubleControl', DoubleControl) 
114