Initial revision

10 files changed, 812 insertions, 0 deletions

diff --git a/Lib/lib-stdwin/Abstract.py b/Lib/lib-stdwin/Abstract.py
new file mode 100644
index 0000000..d601527
--- /dev/null
+++ b/Lib/lib-stdwin/Abstract.py
@@ -0,0 +1,53 @@
+# Abstract classes for parents and children.
+# Do not use as base class -- this is for documentation only.
+# Note that the tree must be built top down.
+
+class AbstractParent():
+	#
+	# Upcalls from child to parent
+	#
+	def addchild(self, child): unimpl()
+	def delchild(self, child): unimpl()
+	#
+	def need_mouse(self, child): unimpl()
+	def no_mouse(self, child): unimpl()
+	#
+	def need_timer(self, child): unimpl()
+	def no_timer(self, child): unimpl()
+	#
+	# XXX need_kbd, no_kbd; focus???
+	#
+	def begindrawing(self): return unimpl()
+	def beginmeasuring(self): return unimpl()
+	#
+	def change(self, area): unimpl()
+	def scroll(self, (area, (dh, dv))): unimpl()
+	def settimer(self, itimer): unimpl()
+
+class AbstractChild():
+	#
+	# Downcalls from parent to child
+	#
+	def destroy(self): unimpl()
+	#
+	def minsize(self, m): return unimpl()
+	def getbounds(self): return unimpl()
+	def setbounds(self, bounds): unimpl()
+	def draw(self, (d, area)): unimpl()
+	#
+	# Downcalls only made after certain upcalls
+	#
+	def mouse_down(self, detail): unimpl()
+	def mouse_move(self, detail): unimpl()
+	def mouse_up(self, detail): unimpl()
+	#
+	def timer(self): unimpl()
+
+# A "Split" is a child that manages one or more children.
+# (This terminology is due to DEC SRC, except for CSplits.)
+# A child of a split may be another split, a button, a slider, etc.
+# Certain upcalls and downcalls can be handled transparently, but
+# for others (e.g., all geometry related calls) this is not possible.
+
+class AbstractSplit() = AbstractChild(), AbstractParent():
+	pass
diff --git a/Lib/lib-stdwin/HVSplit.py b/Lib/lib-stdwin/HVSplit.py
new file mode 100644
index 0000000..2ee18f2
--- /dev/null
+++ b/Lib/lib-stdwin/HVSplit.py
@@ -0,0 +1,52 @@
+# HVSplit contains generic code for HSplit and VSplit.
+# HSplit and VSplit are specializations to either dimension.
+
+from Split import Split
+
+class HVSplit() = Split():
+	#
+	def create(self, (parent, hv)):
+		# hv is 0 or 1 for HSplit or VSplit
+		self = Split.create(self, parent)
+		self.hv = hv
+		return self
+	#
+	def minsize(self, m):
+		hv, vh = self.hv, 1 - self.hv
+		size = [0, 0]
+		for c in self.children:
+			csize = c.minsize(m)
+			if csize[vh] > size[vh]: size[vh] = csize[vh]
+			size[hv] = size[hv] + csize[hv]
+		return size[0], size[1]
+	#
+	def getbounds(self):
+		return self.bounds
+	#
+	def setbounds(self, bounds):
+		self.bounds = bounds
+		hv, vh = self.hv, 1 - self.hv
+		mf = self.parent.beginmeasuring
+		size = self.minsize(mf())
+		# XXX not yet used!  Later for stretching
+		maxsize_hv = bounds[1][hv] - bounds[0][hv]
+		origin = [self.bounds[0][0], self.bounds[0][1]]
+		for c in self.children:
+			size = c.minsize(mf())
+			corner = [0, 0]
+			corner[vh] = bounds[1][vh]
+			corner[hv] = origin[hv] + size[hv]
+			c.setbounds((origin[0], origin[1]), \
+					(corner[0], corner[1]))
+			origin[hv] = corner[hv]
+			# XXX stretch
+			# XXX too-small
+	#
+
+class HSplit() = HVSplit():
+	def create(self, parent):
+		return HVSplit.create(self, (parent, 0))
+
+class VSplit() = HVSplit():
+	def create(self, parent):
+		return HVSplit.create(self, (parent, 1))
diff --git a/Lib/lib-stdwin/Split.py b/Lib/lib-stdwin/Split.py
new file mode 100644
index 0000000..c442fe3
--- /dev/null
+++ b/Lib/lib-stdwin/Split.py
@@ -0,0 +1,113 @@
+# Generic Split implementation.
+# Use as a base class for other splits.
+
+Error = 'Split.Error'	# Exception
+
+import rect
+from util import remove
+
+class Split():
+	#
+	# Calls from creator
+	# NB derived classes may add parameters to create()
+	#
+	def create(self, parent):
+		parent.addchild(self)
+		self.parent = parent
+		self.children = []
+		self.mouse_interest = []
+		self.timer_interest = []
+		self.mouse_focus = 0
+		return self
+	#
+	# Downcalls from parent to child
+	#
+	def destroy(self):
+		self.parent = 0
+		for child in self.children:
+			child.destroy()
+		self.children[:] = []
+		self.mouse_interest[:] = []
+		self.timer_interest[:] = []
+		self.mouse_focus = 0
+	#
+	def minsize(self, m): return unimpl()
+	def getbounds(self): return unimpl()
+	def setbounds(self, bounds): unimpl()
+	def draw(self, args):
+		# (Could avoid calls to children outside the area)
+		for child in self.children:
+			child.draw(args)
+	#
+	# Downcalls only made after certain upcalls
+	#
+	def mouse_down(self, detail):
+		if self.mouse_focus:
+			self.mouse_focus.mouse_down(detail)
+		p = detail[0]
+		for child in self.mouse_interest:
+			if rect.pointinrect(p, child.getbounds()):
+				self.mouse_focus = child
+				child.mouse_down(detail)
+	def mouse_move(self, detail):
+		if self.mouse_focus:
+			self.mouse_focus.mouse_move(detail)
+	def mouse_up(self, detail):
+		if self.mouse_focus:
+			self.mouse_focus.mouse_up(detail)
+			self.mouse_focus = 0
+	#
+	def timer(self):
+		for child in self.timer_interest:
+			child.timer()
+	#
+	# Upcalls from child to parent
+	#
+	def addchild(self, child):
+		if child in self.children:
+			raise Error, 'addchild: child already inlist'
+		self.children.append(child)
+	def delchild(self, child):
+		if child not in self.children:
+			raise Error, 'delchild: child not in list'
+		remove(child, self.children)
+		if child in self.mouse_interest:
+			remove(child, self.mouse_interest)
+		if child in self.timer_interest:
+			remove(child, self.timer_interest)
+		if child = self.mouse_focus:
+			self.mouse_focus = 0
+	#
+	def need_mouse(self, child):
+		if child not in self.mouse_interest:
+			self.mouse_interest.append(child)
+			self.parent.need_mouse(self)
+	def no_mouse(self, child):
+		if child in self.mouse_interest:
+			remove(child, self.mouse_interest)
+			if not self.mouse_interest:
+				self.parent.no_mouse(self)
+	#
+	def need_timer(self, child):
+		if child not in self.timer_interest:
+			self.timer_interest.append(child)
+			self.parent.need_timer(self)
+	def no_timer(self, child):
+		if child in self.timer_interest:
+			remove(child, self.timer_interest)
+			if not self.timer_interest:
+				self.parent.no_timer(self)
+	#
+	# The rest are transparent:
+	#
+	def begindrawing(self):
+		return self.parent.begindrawing()
+	def beginmeasuring(self):
+		return self.parent.beginmeasuring()
+	#
+	def change(self, area):
+		self.parent.change(area)
+	def scroll(self, args):
+		self.parent.scroll(args)
+	def settimer(self, itimer):
+		self.parent.settimer(itimer)
diff --git a/Lib/lib-stdwin/TransParent.py b/Lib/lib-stdwin/TransParent.py
new file mode 100644
index 0000000..8cee283
--- /dev/null
+++ b/Lib/lib-stdwin/TransParent.py
@@ -0,0 +1,96 @@
+# A class that sits transparently between a parent and one child.
+# First create the parent, then this thing, then the child.
+# Use this as a base class for objects that are almost transparent.
+# Don't use as a base class for parents with multiple children.
+
+Error = 'TransParent.Error'	# Exception
+
+class ManageOneChild():
+	#
+	# Upcalls shared with other single-child parents
+	#
+	def addchild(self, child):
+		if self.child:
+			raise Error, 'addchild: one child only'
+		if not child:
+			raise Error, 'addchild: bad child'
+		self.child = child
+	#
+	def delchild(self, child):
+		if not self.child:
+			raise Error, 'delchild: no child'
+		if child <> self.child:
+			raise Error, 'delchild: not my child'
+		self.child = 0
+
+class TransParent() = ManageOneChild():
+	#
+	# Calls from creator
+	# NB derived classes may add parameters to create()
+	#
+	def create(self, parent):
+		parent.addchild(self)
+		self.parent = parent
+		self.child = 0 # No child yet
+	#
+	# Downcalls from parent to child
+	#
+	def destroy(self):
+		del self.parent
+		if self.child: self.child.destroy()
+		del self.child
+	#
+	def minsize(self, m):
+		if not self.child:
+			return 0, 0
+		else:
+			return self.child.minsize(m)
+	def getbounds(self, bounds):
+		if not self.child:
+			raise Error, 'getbounds w/o child'
+		else:
+			return self.child.getbounds()
+	def setbounds(self, bounds):
+		if not self.child:
+			raise Error, 'setbounds w/o child'
+		else:
+			self.child.setbounds(bounds)
+	def draw(self, args):
+		if self.child:
+			self.child.draw(args)
+	#
+	# Downcalls only made after certain upcalls
+	#
+	def mouse_down(self, detail):
+		if self.child: self.child.mouse_down(detail)
+	def mouse_move(self, detail):
+		if self.child: self.child.mouse_move(detail)
+	def mouse_up(self, detail):
+		if self.child: self.child.mouse_up(detail)
+	#
+	def timer(self):
+		if self.child: self.child.timer()
+	#
+	# Upcalls from child to parent
+	#
+	def need_mouse(self, child):
+		self.parent.need_mouse(self)
+	def no_mouse(self, child):
+		self.parent.no_mouse(self)
+	#
+	def need_timer(self, child):
+		self.parent.need_timer(self)
+	def no_timer(self, child):
+		self.parent.no_timer(self)
+	#
+	def begindrawing(self):
+		return self.parent.begindrawing()
+	def beginmeasuring(self):
+		return self.parent.beginmeasuring()
+	#
+	def change(self, area):
+		self.parent.change(area)
+	def scroll(self, args):
+		self.parent.scroll(args)
+	def settimer(self, itimer):
+		self.parent.settimer(itimer)
diff --git a/Lib/lib-stdwin/WindowParent.py b/Lib/lib-stdwin/WindowParent.py
new file mode 100644
index 0000000..39838f7
--- /dev/null
+++ b/Lib/lib-stdwin/WindowParent.py
@@ -0,0 +1,92 @@
+# A 'WindowParent' is the only module that uses real stdwin functionality.
+# It is the root of the tree.
+# It should have exactly one child when realized.
+
+import stdwin
+from stdwinevents import *
+
+from TransParent import ManageOneChild
+
+Error = 'WindowParent.Error'	# Exception
+
+class WindowParent() = ManageOneChild():
+	#
+	def create(self, (title, size)):
+		self.title = title
+		self.size = size		# (width, height)
+		self.child = 0			# i.e., no child yet
+		self.win = 0			# i.e., no window yet
+		self.itimer = 0
+		self.do_mouse = 0
+		self.do_timer = 0
+		return self
+	#
+	def need_mouse(self, child): self.do_mouse = 1
+	def no_mouse(self, child): self.do_mouse = 0
+	#
+	def need_timer(self, child): self.do_timer = 1
+	def no_timer(self, child): self.do_timer = 0
+	#
+	def realize(self):
+		if self.win:
+			raise Error, 'realize(): called twice'
+		if not self.child:
+			raise Error, 'realize(): no child'
+		size = self.child.minsize(self.beginmeasuring())
+		self.size = max(self.size[0], size[0]), \
+						max(self.size[1], size[1])
+		stdwin.setdefwinsize(self.size)
+		self.win = stdwin.open(self.title)
+		if self.itimer:
+			self.win.settimer(self.itimer)
+		bounds = (0, 0), self.win.getwinsize()
+		self.child.setbounds(bounds)
+	#
+	def beginmeasuring(self):
+		# Return something with which a child can measure text
+		if self.win:
+			return self.win.begindrawing()
+		else:
+			return stdwin
+	#
+	def begindrawing(self):
+		if self.win:
+			return self.win.begindrawing()
+		else:
+			raise Error, 'begindrawing(): not realized yet'
+	#
+	def change(self, area):
+		if self.win:
+			self.win.change(area)
+	#
+	def scroll(self, args):
+		if self.win:
+			self.win.scroll(args)
+	#
+	def settimer(self, itimer):
+		if self.win:
+			self.win.settimer(itimer)
+		else:
+			self.itimer = itimer
+	#
+	# Only call dispatch if we have a child
+	#
+	def dispatch(self, (type, win, detail)):
+		if win <> self.win:
+			return
+		elif type = WE_DRAW:
+			d = self.win.begindrawing()
+			self.child.draw(d, detail)
+		elif type = WE_MOUSE_DOWN:
+			if self.do_mouse: self.child.mouse_down(detail)
+		elif type = WE_MOUSE_MOVE:
+			if self.do_mouse: self.child.mouse_move(detail)
+		elif type = WE_MOUSE_UP:
+			if self.do_mouse: self.child.mouse_up(detail)
+		elif type = WE_TIMER:
+			if self.do_timer: self.child.timer()
+		elif type = WE_SIZE:
+			self.win.change((0, 0), (10000, 10000)) # XXX
+			bounds = (0, 0), self.win.getwinsize()
+			self.child.setbounds(bounds)
+	#
diff --git a/Lib/stdwin/Abstract.py b/Lib/stdwin/Abstract.py
new file mode 100755
index 0000000..d601527
--- /dev/null
+++ b/Lib/stdwin/Abstract.py
@@ -0,0 +1,53 @@
+# Abstract classes for parents and children.
+# Do not use as base class -- this is for documentation only.
+# Note that the tree must be built top down.
+
+class AbstractParent():
+	#
+	# Upcalls from child to parent
+	#
+	def addchild(self, child): unimpl()
+	def delchild(self, child): unimpl()
+	#
+	def need_mouse(self, child): unimpl()
+	def no_mouse(self, child): unimpl()
+	#
+	def need_timer(self, child): unimpl()
+	def no_timer(self, child): unimpl()
+	#
+	# XXX need_kbd, no_kbd; focus???
+	#
+	def begindrawing(self): return unimpl()
+	def beginmeasuring(self): return unimpl()
+	#
+	def change(self, area): unimpl()
+	def scroll(self, (area, (dh, dv))): unimpl()
+	def settimer(self, itimer): unimpl()
+
+class AbstractChild():
+	#
+	# Downcalls from parent to child
+	#
+	def destroy(self): unimpl()
+	#
+	def minsize(self, m): return unimpl()
+	def getbounds(self): return unimpl()
+	def setbounds(self, bounds): unimpl()
+	def draw(self, (d, area)): unimpl()
+	#
+	# Downcalls only made after certain upcalls
+	#
+	def mouse_down(self, detail): unimpl()
+	def mouse_move(self, detail): unimpl()
+	def mouse_up(self, detail): unimpl()
+	#
+	def timer(self): unimpl()
+
+# A "Split" is a child that manages one or more children.
+# (This terminology is due to DEC SRC, except for CSplits.)
+# A child of a split may be another split, a button, a slider, etc.
+# Certain upcalls and downcalls can be handled transparently, but
+# for others (e.g., all geometry related calls) this is not possible.
+
+class AbstractSplit() = AbstractChild(), AbstractParent():
+	pass
diff --git a/Lib/stdwin/HVSplit.py b/Lib/stdwin/HVSplit.py
new file mode 100755
index 0000000..2ee18f2
--- /dev/null
+++ b/Lib/stdwin/HVSplit.py
@@ -0,0 +1,52 @@
+# HVSplit contains generic code for HSplit and VSplit.
+# HSplit and VSplit are specializations to either dimension.
+
+from Split import Split
+
+class HVSplit() = Split():
+	#
+	def create(self, (parent, hv)):
+		# hv is 0 or 1 for HSplit or VSplit
+		self = Split.create(self, parent)
+		self.hv = hv
+		return self
+	#
+	def minsize(self, m):
+		hv, vh = self.hv, 1 - self.hv
+		size = [0, 0]
+		for c in self.children:
+			csize = c.minsize(m)
+			if csize[vh] > size[vh]: size[vh] = csize[vh]
+			size[hv] = size[hv] + csize[hv]
+		return size[0], size[1]
+	#
+	def getbounds(self):
+		return self.bounds
+	#
+	def setbounds(self, bounds):
+		self.bounds = bounds
+		hv, vh = self.hv, 1 - self.hv
+		mf = self.parent.beginmeasuring
+		size = self.minsize(mf())
+		# XXX not yet used!  Later for stretching
+		maxsize_hv = bounds[1][hv] - bounds[0][hv]
+		origin = [self.bounds[0][0], self.bounds[0][1]]
+		for c in self.children:
+			size = c.minsize(mf())
+			corner = [0, 0]
+			corner[vh] = bounds[1][vh]
+			corner[hv] = origin[hv] + size[hv]
+			c.setbounds((origin[0], origin[1]), \
+					(corner[0], corner[1]))
+			origin[hv] = corner[hv]
+			# XXX stretch
+			# XXX too-small
+	#
+
+class HSplit() = HVSplit():
+	def create(self, parent):
+		return HVSplit.create(self, (parent, 0))
+
+class VSplit() = HVSplit():
+	def create(self, parent):
+		return HVSplit.create(self, (parent, 1))
diff --git a/Lib/stdwin/Split.py b/Lib/stdwin/Split.py
new file mode 100755
index 0000000..c442fe3
--- /dev/null
+++ b/Lib/stdwin/Split.py
@@ -0,0 +1,113 @@
+# Generic Split implementation.
+# Use as a base class for other splits.
+
+Error = 'Split.Error'	# Exception
+
+import rect
+from util import remove
+
+class Split():
+	#
+	# Calls from creator
+	# NB derived classes may add parameters to create()
+	#
+	def create(self, parent):
+		parent.addchild(self)
+		self.parent = parent
+		self.children = []
+		self.mouse_interest = []
+		self.timer_interest = []
+		self.mouse_focus = 0
+		return self
+	#
+	# Downcalls from parent to child
+	#
+	def destroy(self):
+		self.parent = 0
+		for child in self.children:
+			child.destroy()
+		self.children[:] = []
+		self.mouse_interest[:] = []
+		self.timer_interest[:] = []
+		self.mouse_focus = 0
+	#
+	def minsize(self, m): return unimpl()
+	def getbounds(self): return unimpl()
+	def setbounds(self, bounds): unimpl()
+	def draw(self, args):
+		# (Could avoid calls to children outside the area)
+		for child in self.children:
+			child.draw(args)
+	#
+	# Downcalls only made after certain upcalls
+	#
+	def mouse_down(self, detail):
+		if self.mouse_focus:
+			self.mouse_focus.mouse_down(detail)
+		p = detail[0]
+		for child in self.mouse_interest:
+			if rect.pointinrect(p, child.getbounds()):
+				self.mouse_focus = child
+				child.mouse_down(detail)
+	def mouse_move(self, detail):
+		if self.mouse_focus:
+			self.mouse_focus.mouse_move(detail)
+	def mouse_up(self, detail):
+		if self.mouse_focus:
+			self.mouse_focus.mouse_up(detail)
+			self.mouse_focus = 0
+	#
+	def timer(self):
+		for child in self.timer_interest:
+			child.timer()
+	#
+	# Upcalls from child to parent
+	#
+	def addchild(self, child):
+		if child in self.children:
+			raise Error, 'addchild: child already inlist'
+		self.children.append(child)
+	def delchild(self, child):
+		if child not in self.children:
+			raise Error, 'delchild: child not in list'
+		remove(child, self.children)
+		if child in self.mouse_interest:
+			remove(child, self.mouse_interest)
+		if child in self.timer_interest:
+			remove(child, self.timer_interest)
+		if child = self.mouse_focus:
+			self.mouse_focus = 0
+	#
+	def need_mouse(self, child):
+		if child not in self.mouse_interest:
+			self.mouse_interest.append(child)
+			self.parent.need_mouse(self)
+	def no_mouse(self, child):
+		if child in self.mouse_interest:
+			remove(child, self.mouse_interest)
+			if not self.mouse_interest:
+				self.parent.no_mouse(self)
+	#
+	def need_timer(self, child):
+		if child not in self.timer_interest:
+			self.timer_interest.append(child)
+			self.parent.need_timer(self)
+	def no_timer(self, child):
+		if child in self.timer_interest:
+			remove(child, self.timer_interest)
+			if not self.timer_interest:
+				self.parent.no_timer(self)
+	#
+	# The rest are transparent:
+	#
+	def begindrawing(self):
+		return self.parent.begindrawing()
+	def beginmeasuring(self):
+		return self.parent.beginmeasuring()
+	#
+	def change(self, area):
+		self.parent.change(area)
+	def scroll(self, args):
+		self.parent.scroll(args)
+	def settimer(self, itimer):
+		self.parent.settimer(itimer)
diff --git a/Lib/stdwin/TransParent.py b/Lib/stdwin/TransParent.py
new file mode 100755
index 0000000..8cee283
--- /dev/null
+++ b/Lib/stdwin/TransParent.py
@@ -0,0 +1,96 @@
+# A class that sits transparently between a parent and one child.
+# First create the parent, then this thing, then the child.
+# Use this as a base class for objects that are almost transparent.
+# Don't use as a base class for parents with multiple children.
+
+Error = 'TransParent.Error'	# Exception
+
+class ManageOneChild():
+	#
+	# Upcalls shared with other single-child parents
+	#
+	def addchild(self, child):
+		if self.child:
+			raise Error, 'addchild: one child only'
+		if not child:
+			raise Error, 'addchild: bad child'
+		self.child = child
+	#
+	def delchild(self, child):
+		if not self.child:
+			raise Error, 'delchild: no child'
+		if child <> self.child:
+			raise Error, 'delchild: not my child'
+		self.child = 0
+
+class TransParent() = ManageOneChild():
+	#
+	# Calls from creator
+	# NB derived classes may add parameters to create()
+	#
+	def create(self, parent):
+		parent.addchild(self)
+		self.parent = parent
+		self.child = 0 # No child yet
+	#
+	# Downcalls from parent to child
+	#
+	def destroy(self):
+		del self.parent
+		if self.child: self.child.destroy()
+		del self.child
+	#
+	def minsize(self, m):
+		if not self.child:
+			return 0, 0
+		else:
+			return self.child.minsize(m)
+	def getbounds(self, bounds):
+		if not self.child:
+			raise Error, 'getbounds w/o child'
+		else:
+			return self.child.getbounds()
+	def setbounds(self, bounds):
+		if not self.child:
+			raise Error, 'setbounds w/o child'
+		else:
+			self.child.setbounds(bounds)
+	def draw(self, args):
+		if self.child:
+			self.child.draw(args)
+	#
+	# Downcalls only made after certain upcalls
+	#
+	def mouse_down(self, detail):
+		if self.child: self.child.mouse_down(detail)
+	def mouse_move(self, detail):
+		if self.child: self.child.mouse_move(detail)
+	def mouse_up(self, detail):
+		if self.child: self.child.mouse_up(detail)
+	#
+	def timer(self):
+		if self.child: self.child.timer()
+	#
+	# Upcalls from child to parent
+	#
+	def need_mouse(self, child):
+		self.parent.need_mouse(self)
+	def no_mouse(self, child):
+		self.parent.no_mouse(self)
+	#
+	def need_timer(self, child):
+		self.parent.need_timer(self)
+	def no_timer(self, child):
+		self.parent.no_timer(self)
+	#
+	def begindrawing(self):
+		return self.parent.begindrawing()
+	def beginmeasuring(self):
+		return self.parent.beginmeasuring()
+	#
+	def change(self, area):
+		self.parent.change(area)
+	def scroll(self, args):
+		self.parent.scroll(args)
+	def settimer(self, itimer):
+		self.parent.settimer(itimer)
diff --git a/Lib/stdwin/WindowParent.py b/Lib/stdwin/WindowParent.py
new file mode 100755
index 0000000..39838f7
--- /dev/null
+++ b/Lib/stdwin/WindowParent.py
@@ -0,0 +1,92 @@
+# A 'WindowParent' is the only module that uses real stdwin functionality.
+# It is the root of the tree.
+# It should have exactly one child when realized.
+
+import stdwin
+from stdwinevents import *
+
+from TransParent import ManageOneChild
+
+Error = 'WindowParent.Error'	# Exception
+
+class WindowParent() = ManageOneChild():
+	#
+	def create(self, (title, size)):
+		self.title = title
+		self.size = size		# (width, height)
+		self.child = 0			# i.e., no child yet
+		self.win = 0			# i.e., no window yet
+		self.itimer = 0
+		self.do_mouse = 0
+		self.do_timer = 0
+		return self
+	#
+	def need_mouse(self, child): self.do_mouse = 1
+	def no_mouse(self, child): self.do_mouse = 0
+	#
+	def need_timer(self, child): self.do_timer = 1
+	def no_timer(self, child): self.do_timer = 0
+	#
+	def realize(self):
+		if self.win:
+			raise Error, 'realize(): called twice'
+		if not self.child:
+			raise Error, 'realize(): no child'
+		size = self.child.minsize(self.beginmeasuring())
+		self.size = max(self.size[0], size[0]), \
+						max(self.size[1], size[1])
+		stdwin.setdefwinsize(self.size)
+		self.win = stdwin.open(self.title)
+		if self.itimer:
+			self.win.settimer(self.itimer)
+		bounds = (0, 0), self.win.getwinsize()
+		self.child.setbounds(bounds)
+	#
+	def beginmeasuring(self):
+		# Return something with which a child can measure text
+		if self.win:
+			return self.win.begindrawing()
+		else:
+			return stdwin
+	#
+	def begindrawing(self):
+		if self.win:
+			return self.win.begindrawing()
+		else:
+			raise Error, 'begindrawing(): not realized yet'
+	#
+	def change(self, area):
+		if self.win:
+			self.win.change(area)
+	#
+	def scroll(self, args):
+		if self.win:
+			self.win.scroll(args)
+	#
+	def settimer(self, itimer):
+		if self.win:
+			self.win.settimer(itimer)
+		else:
+			self.itimer = itimer
+	#
+	# Only call dispatch if we have a child
+	#
+	def dispatch(self, (type, win, detail)):
+		if win <> self.win:
+			return
+		elif type = WE_DRAW:
+			d = self.win.begindrawing()
+			self.child.draw(d, detail)
+		elif type = WE_MOUSE_DOWN:
+			if self.do_mouse: self.child.mouse_down(detail)
+		elif type = WE_MOUSE_MOVE:
+			if self.do_mouse: self.child.mouse_move(detail)
+		elif type = WE_MOUSE_UP:
+			if self.do_mouse: self.child.mouse_up(detail)
+		elif type = WE_TIMER:
+			if self.do_timer: self.child.timer()
+		elif type = WE_SIZE:
+			self.win.change((0, 0), (10000, 10000)) # XXX
+			bounds = (0, 0), self.win.getwinsize()
+			self.child.setbounds(bounds)
+	#