Lib/stdwin/WindowParent.py

   1 # A 'WindowParent' is the only module that uses real stdwin functionality.
   2 # It is the root of the tree.
   3 # It should have exactly one child when realized.
   4 #
   5 # There is also an alternative interface to "mainloop" here.
   6
   7 import stdwin
   8 from stdwinevents import *
   9 import mainloop
  10
  11 from TransParent import ManageOneChild
  12
  13 Error = 'WindowParent.Error'    # Exception
  14
  15 class WindowParent(ManageOneChild):
  16         #
  17         def create(self, title, size):
  18                 self.title = title
  19                 self.size = size                # (width, height)
  20                 self._reset()
  21                 self.close_hook = WindowParent.delayed_destroy
  22                 return self
  23         #
  24         def _reset(self):
  25                 self.child = None
  26                 self.win = None
  27                 self.itimer = 0
  28                 self.do_mouse = 0
  29                 self.do_keybd = 0
  30                 self.do_timer = 0
  31                 self.do_altdraw = 0
  32                 self.pending_destroy = 0
  33                 self.close_hook = None
  34                 self.menu_hook = None
  35         #
  36         def destroy(self):
  37                 mainloop.unregister(self.win)
  38                 if self.child: self.child.destroy()
  39                 self._reset()
  40         #
  41         def delayed_destroy(self):
  42                 # This interface to be used by 'Close' buttons etc.;
  43                 # destroying a window from within a button hook
  44                 # is not a good idea...
  45                 self.pending_destroy = 1
  46         #
  47         def close_trigger(self):
  48                 if self.close_hook: self.close_hook(self)
  49         #
  50         def menu_trigger(self, menu, item):
  51                 if self.menu_hook:
  52                         self.menu_hook(self, menu, item)
  53         #
  54         def need_mouse(self, child): self.do_mouse = 1
  55         def no_mouse(self, child): self.do_mouse = 0
  56         #
  57         def need_keybd(self, child):
  58                 self.do_keybd = 1
  59                 self.child.activate()
  60         def no_keybd(self, child):
  61                 self.do_keybd = 0
  62                 self.child.deactivate()
  63         #
  64         def need_timer(self, child): self.do_timer = 1
  65         def no_timer(self, child): self.do_timer = 0
  66         #
  67         def need_altdraw(self, child): self.do_altdraw = 1
  68         def no_altdraw(self, child): self.do_altdraw = 0
  69         #
  70         def realize(self):
  71                 if self.win:
  72                         raise Error, 'realize(): called twice'
  73                 if not self.child:
  74                         raise Error, 'realize(): no child'
  75                 # Compute suggested size
  76                 self.size = self.child.getminsize(self.beginmeasuring(), \
  77                                                   self.size)
  78                 save_defsize = stdwin.getdefwinsize()
  79                 scrwidth, scrheight = stdwin.getscrsize()
  80                 width, height = self.size
  81                 if width > scrwidth:
  82                         width = scrwidth * 2/3
  83                 if height > scrheight:
  84                         height = scrheight * 2/3
  85                 stdwin.setdefwinsize(width, height)
  86                 self.hbar, self.vbar = stdwin.getdefscrollbars()
  87                 self.win = stdwin.open(self.title)
  88                 stdwin.setdefwinsize(save_defsize)
  89                 self.win.setdocsize(self.size)
  90                 if self.itimer:
  91                         self.win.settimer(self.itimer)
  92                 width, height = self.win.getwinsize()
  93                 if self.hbar:
  94                         width = self.size[0]
  95                 if self.vbar:
  96                         height = self.size[1]
  97                 self.child.setbounds(((0, 0), (width, height)))
  98                 self.child.realize()
  99                 self.win.dispatch = self.dispatch
 100                 mainloop.register(self.win)
 101         #
 102         def fixup(self):
 103                 # XXX This could share code with realize() above
 104                 self.size = self.child.getminsize(self.beginmeasuring(), \
 105                                                   self.win.getwinsize())
 106                 self.win.setdocsize(self.size)
 107                 width, height = self.win.getwinsize()
 108                 if self.hbar:
 109                         width = self.size[0]
 110                 if self.vbar:
 111                         height = self.size[1]
 112                 self.child.setbounds(((0, 0), (width, height)))
 113                 # Force a redraw of the entire window:
 114                 self.win.change((0, 0), self.size)
 115         #
 116         def beginmeasuring(self):
 117                 # Return something with which a child can measure text
 118                 if self.win:
 119                         return self.win.begindrawing()
 120                 else:
 121                         return stdwin
 122         #
 123         def begindrawing(self):
 124                 if self.win:
 125                         return self.win.begindrawing()
 126                 else:
 127                         raise Error, 'begindrawing(): not realized yet'
 128         #
 129         def getwindow(self):
 130                 if self.win:
 131                         return self.win
 132                 else:
 133                         raise Error, 'getwindow(): not realized yet'
 134         #
 135         def change(self, area):
 136                 if self.win:
 137                         self.win.change(area)
 138         #
 139         def scroll(self, area, vector):
 140                 if self.win:
 141                         self.win.scroll(area, vector)
 142         #
 143         def settimer(self, itimer):
 144                 if self.win:
 145                         self.win.settimer(itimer)
 146                 else:
 147                         self.itimer = itimer
 148         #
 149         # Only call dispatch once we are realized
 150         #
 151         def dispatch(self, (type, win, detail)):
 152                 if type == WE_DRAW:
 153                         d = self.win.begindrawing()
 154                         self.child.draw(d, detail)
 155                         del d
 156                         if self.do_altdraw: self.child.altdraw(detail)
 157                 elif type == WE_MOUSE_DOWN:
 158                         if self.do_mouse: self.child.mouse_down(detail)
 159                 elif type == WE_MOUSE_MOVE:
 160                         if self.do_mouse: self.child.mouse_move(detail)
 161                 elif type == WE_MOUSE_UP:
 162                         if self.do_mouse: self.child.mouse_up(detail)
 163                 elif type in (WE_CHAR, WE_COMMAND):
 164                         if self.do_keybd: self.child.keybd(type, detail)
 165                 elif type == WE_TIMER:
 166                         if self.do_timer: self.child.timer()
 167                 elif type == WE_SIZE:
 168                         self.fixup()
 169                 elif type == WE_CLOSE:
 170                         self.close_trigger()
 171                 elif type == WE_MENU:
 172                         self.menu_trigger(detail)
 173                 if self.pending_destroy:
 174                         self.destroy()
 175         #
 176
 177 def MainLoop():
 178         mainloop.mainloop()
 179
 180 def Dispatch(event):
 181         mainloop.dispatch(event)
 182
 183 # Interface used by WindowSched:
 184
 185 def CountWindows():
 186         return mainloop.countwindows()
 187
 188 def AnyWindow():
 189         return mainloop.anywindow()