Minimal text editor using MLTE (code based on wed.py, the waste demo).

It's sort-of starting to work, but there's still problems with redraws and
with resizing the window.

Mac/Demo/mlte/mlted.py

+# A minimal text editor using MLTE. Based on wed.py.
+#
+# To be done:
+# - Functionality: find, etc.
+
+from Menu import DrawMenuBar
+from FrameWork import *
+import Win
+import Qd
+import Res
+import Scrap
+import os
+import macfs
+import MacTextEditor
+import Mlte
+
+UNDOLABELS = [ # Indexed by MLTECanUndo() value
+	"Typing", "Cut", "Paste", "Clear", "Font Change", "Color Change", "Size Change",
+	"Style Change", "Align Left", "Align Center", "Align Right", "Drop", "Move"]
+	
+class WasteWindow(Window):
+	def open(self, path, name, data):
+		self.path = path
+		self.name = name
+		r = windowbounds(400, 400)
+		w = Win.NewWindow(r, name, 1, 0, -1, 1, 0x55555555)
+		self.wid = w
+##		vr = 0, 0, r[2]-r[0]-15, r[3]-r[1]-15
+##		dr = (0, 0, 10240, 0)
+##		Qd.SetPort(w)
+##		Qd.TextFont(4)
+##		Qd.TextSize(9)
+##		self.ted = waste.WENew(dr, vr, flags)
+		flags = MacTextEditor.kTXNDrawGrowIconMask|MacTextEditor.kTXNShowWindowMask|MacTextEditor.kTXNWantHScrollBarMask| \
+				MacTextEditor.kTXNWantVScrollBarMask
+		self.ted, self.frameid = Mlte.TXNNewObject(None, w, None, flags, MacTextEditor.kTXNTextEditStyleFrameType,
+				MacTextEditor.kTXNTextFile, MacTextEditor.kTXNMacOSEncoding)
+##		self.tedtexthandle = Res.Resource(data)
+##		self.ted.WEUseText(self.tedtexthandle)
+		self.ted.TXNSetData(MacTextEditor.kTXNTextData, data, 0, 0x7fffffff)
+##		self.ted.WECalText()
+##		w.DrawGrowIcon()
+##		self.scrollbars()
+		self.changed = 0
+		self.do_postopen()
+		self.do_activate(1, None)
+		
+	def do_idle(self, event):
+##		(what, message, when, where, modifiers) = event
+##		Qd.SetPort(self.wid)
+		self.ted.TXNIdle()	
+		self.ted.TXNAdjustCursor(None)
+		
+##	def getscrollbarvalues(self):
+##		dr = self.ted.WEGetDestRect()
+##		vr = self.ted.WEGetViewRect()
+##		vx = self.scalebarvalue(dr[0], dr[2], vr[0], vr[2])
+##		vy = self.scalebarvalue(dr[1], dr[3], vr[1], vr[3])
+####		print dr, vr, vx, vy
+##		return vx, vy
+##		
+##	def scrollbar_callback(self, which, what, value):
+##		if which == 'y':
+##			if what == 'set':
+##				height = self.ted.WEGetHeight(0, 0x3fffffff)
+##				cur = self.getscrollbarvalues()[1]
+##				delta = (cur-value)*height/32767
+##			if what == '-':
+##				topline_off,dummy = self.ted.WEGetOffset((1,1))
+##				topline_num = self.ted.WEOffsetToLine(topline_off)
+##				delta = self.ted.WEGetHeight(topline_num, topline_num+1)
+##			elif what == '--':
+##				delta = (self.ted.WEGetViewRect()[3]-10)
+##				if delta <= 0:
+##					delta = 10 # Random value
+##			elif what == '+':
+##				# XXXX Wrong: should be bottom line size
+##				topline_off,dummy = self.ted.WEGetOffset((1,1))
+##				topline_num = self.ted.WEOffsetToLine(topline_off)
+##				delta = -self.ted.WEGetHeight(topline_num, topline_num+1)
+##			elif what == '++':
+##				delta = -(self.ted.WEGetViewRect()[3]-10)
+##				if delta >= 0:
+##					delta = -10
+##			self.ted.WEScroll(0, delta)
+####			print 'SCROLL Y', delta
+##		else:
+##			if what == 'set':
+##				return # XXXX
+##			vr = self.ted.WEGetViewRect()
+##			winwidth = vr[2]-vr[0]
+##			if what == '-':
+##				delta = winwidth/10
+##			elif what == '--':
+##				delta = winwidth/2
+##			elif what == '+':
+##				delta = -winwidth/10
+##			elif what == '++':
+##				delta = -winwidth/2
+##			self.ted.WEScroll(delta, 0)
+##		# Pin the scroll
+##		l, t, r, b = self.ted.WEGetDestRect()
+##		vl, vt, vr, vb = self.ted.WEGetViewRect()
+##		if t > 0 or l > 0:
+##			dx = dy = 0
+##			if t > 0: dy = -t
+##			if l > 0: dx = -l
+####			print 'Extra scroll', dx, dy
+##			self.ted.WEScroll(dx, dy)
+##		elif b < vb:
+####			print 'Extra downscroll', b-vb
+##			self.ted.WEScroll(0, b-vb)
+
+		
+	def do_activate(self, onoff, evt):
+##		print "ACTIVATE", onoff
+		Qd.SetPort(self.wid)
+		Window.do_activate(self, onoff, evt)
+		if onoff:
+			self.ted.TXNFocus(1)
+			self.parent.active = self
+			self.parent.updatemenubar()
+		else:
+			self.ted.TXNFocus(0)
+
+	def do_update(self, wid, event):
+		Qd.SetPort(self.wid)
+##		region = wid.GetWindowPort().visRgn
+##		if Qd.EmptyRgn(region):
+##			return
+##		Qd.EraseRgn(region)
+		self.ted.TXNUpdate()
+##		self.updatescrollbars()
+		
+##	def do_postresize(self, width, height, window):
+##		l, t, r, b = self.ted.WEGetViewRect()
+##		vr = (l, t, l+width-15, t+height-15)
+##		self.ted.WESetViewRect(vr)
+##		self.wid.InvalWindowRect(vr)
+##		ScrolledWindow.do_postresize(self, width, height, window)
+		
+	def do_contentclick(self, local, modifiers, evt):
+##		(what, message, when, where, modifiers) = evt
+		self.ted.TXNClick(evt)
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+
+	def do_char(self, ch, event):
+		self.ted.TXNKeyDown(event)
+##		self.ted.WESelView()
+##		(what, message, when, where, modifiers) = event
+##		self.ted.WEKey(ord(ch), modifiers)
+##		self.changed = 1
+##		self.updatescrollbars()
+##		self.parent.updatemenubar()
+		
+	def close(self):
+		if self.changed:
+			save = EasyDialogs.AskYesNoCancel('Save window "%s" before closing?'%self.name, 1)
+			if save > 0:
+				self.menu_save()
+			elif save < 0:
+				return
+		if self.parent.active == self:
+			self.parent.active = None
+##		self.parent.updatemenubar()
+		del self.ted
+##		del self.tedtexthandle
+		self.do_postclose()
+		
+	def menu_save(self):
+		if not self.path:
+			self.menu_save_as()
+			return # Will call us recursively
+		print 'Saving to ', self.path
+		dhandle = self.ted.TXNGetData(0, 0x7fffffff)
+		data = dhandle.data
+		fp = open(self.path, 'wb')  # NOTE: wb, because data has CR for end-of-line
+		fp.write(data)
+		if data[-1] <> '\r': fp.write('\r')
+		fp.close()
+		self.changed = 0
+		
+	def menu_save_as(self):
+		fss, ok = macfs.StandardPutFile('Save as:')
+		if not ok: return
+		self.path = fss.as_pathname()
+		self.name = os.path.split(self.path)[-1]
+		self.wid.SetWTitle(self.name)
+		self.menu_save()
+		
+	def menu_cut(self):
+##		self.ted.WESelView()
+		self.ted.TXNCut()
+###		Mlte.ConvertToPublicScrap()
+##		Scrap.ZeroScrap()
+##		self.ted.WECut()
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+		self.changed = 1
+		
+	def menu_copy(self):
+##		Scrap.ZeroScrap()
+		self.ted.TXNCopy()
+###		Mlte.ConvertToPublicScrap()
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+		
+	def menu_paste(self):
+###		Mlte.ConvertFromPublicScrap()
+		self.ted.TXNPaste()
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+		self.changed = 1
+		
+	def menu_clear(self):
+##		self.ted.WESelView()
+		self.ted.TXNClear()
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+		self.changed = 1
+
+	def menu_undo(self):
+		self.ted.TXNUndo()
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+				
+	def menu_redo(self):
+		self.ted.TXNRedo()
+##		self.updatescrollbars()
+		self.parent.updatemenubar()
+				
+	def have_selection(self):
+		start, stop = self.ted.TXNGetSelection()
+		return start < stop
+		
+	def can_paste(self):
+		return Mlte.TXNIsScrapPastable()
+		
+	def can_undo(self):
+		can, which = self.ted.TXNCanUndo()
+		if not can:
+			return None
+		if which >= len(UNDOLABELS):
+			# Unspecified undo
+			return "Undo"
+		which = UNDOLABELS[which]
+		
+		return "Undo "+which
+
+	def can_redo(self):
+		can, which = self.ted.TXNCanRedo()
+		if not can:
+			return None
+		if which >= len(UNDOLABELS):
+			# Unspecified undo
+			return "Redo"
+		which = UNDOLABELS[which]
+		
+		return "Redo "+which
+
+class Mlted(Application):
+	def __init__(self):
+		Application.__init__(self)
+		self.num = 0
+		self.active = None
+		self.updatemenubar()
+		
+	def makeusermenus(self):
+		self.filemenu = m = Menu(self.menubar, "File")
+		self.newitem = MenuItem(m, "New window", "N", self.open)
+		self.openitem = MenuItem(m, "Open...", "O", self.openfile)
+		self.closeitem = MenuItem(m, "Close", "W", self.closewin)
+		m.addseparator()
+		self.saveitem = MenuItem(m, "Save", "S", self.save)
+		self.saveasitem = MenuItem(m, "Save as...", "", self.saveas)
+		m.addseparator()
+		self.quititem = MenuItem(m, "Quit", "Q", self.quit)
+		
+		self.editmenu = m = Menu(self.menubar, "Edit")
+		self.undoitem = MenuItem(m, "Undo", "Z", self.undo)
+		self.redoitem = MenuItem(m, "Undo", None, self.redo)
+		self.cutitem = MenuItem(m, "Cut", "X", self.cut)
+		self.copyitem = MenuItem(m, "Copy", "C", self.copy)
+		self.pasteitem = MenuItem(m, "Paste", "V", self.paste)
+		self.clearitem = MenuItem(m, "Clear", "", self.clear)
+		
+		# Groups of items enabled together:
+		self.windowgroup = [self.closeitem, self.saveitem, self.saveasitem, self.editmenu]
+		self.focusgroup = [self.cutitem, self.copyitem, self.clearitem]
+		self.windowgroup_on = -1
+		self.focusgroup_on = -1
+		self.pastegroup_on = -1
+		self.undo_label = "never"
+		self.redo_label = "never"
+		
+	def updatemenubar(self):
+		changed = 0
+		on = (self.active <> None)
+		if on <> self.windowgroup_on:
+			for m in self.windowgroup:
+				m.enable(on)
+			self.windowgroup_on = on
+			changed = 1
+		if on:
+			# only if we have an edit menu
+			on = self.active.have_selection()
+			if on <> self.focusgroup_on:
+				for m in self.focusgroup:
+					m.enable(on)
+				self.focusgroup_on = on
+				changed = 1
+			on = self.active.can_paste()
+			if on <> self.pastegroup_on:
+				self.pasteitem.enable(on)
+				self.pastegroup_on = on
+				changed = 1
+			on = self.active.can_undo()
+			if on <> self.undo_label:
+				if on:
+					self.undoitem.enable(1)
+					self.undoitem.settext(on)
+					self.undo_label = on
+				else:
+					self.undoitem.settext("Nothing to undo")
+					self.undoitem.enable(0)
+				changed = 1
+			on = self.active.can_redo()
+			if on <> self.redo_label:
+				if on:
+					self.redoitem.enable(1)
+					self.redoitem.settext(on)
+					self.redo_label = on
+				else:
+					self.redoitem.settext("Nothing to redo")
+					self.redoitem.enable(0)
+				changed = 1
+		if changed:
+			DrawMenuBar()
+
+	#
+	# Apple menu
+	#
+	
+	def do_about(self, id, item, window, event):
+		EasyDialogs.Message("A simple single-font text editor based on MacTextEditor")
+			
+	#
+	# File menu
+	#
+
+	def open(self, *args):
+		self._open(0)
+		
+	def openfile(self, *args):
+		self._open(1)
+
+	def _open(self, askfile):
+		if askfile:
+			fss, ok = macfs.StandardGetFile('TEXT')
+			if not ok:
+				return
+			path = fss.as_pathname()
+			name = os.path.split(path)[-1]
+			try:
+				fp = open(path, 'rb') # NOTE binary, we need cr as end-of-line
+				data = fp.read()
+				fp.close()
+			except IOError, arg:
+				EasyDialogs.Message("IOERROR: "+`arg`)
+				return
+		else:
+			path = None
+			name = "Untitled %d"%self.num
+			data = ''
+		w = WasteWindow(self)
+		w.open(path, name, data)
+		self.num = self.num + 1
+		
+	def closewin(self, *args):
+		if self.active:
+			self.active.close()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	def save(self, *args):
+		if self.active:
+			self.active.menu_save()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	def saveas(self, *args):
+		if self.active:
+			self.active.menu_save_as()
+		else:
+			EasyDialogs.Message("No active window?")
+			
+		
+	def quit(self, *args):
+		for w in self._windows.values():
+			w.close()
+		if self._windows:
+			return
+		self._quit()
+		
+	#
+	# Edit menu
+	#
+	
+	def undo(self, *args):
+		if self.active:
+			self.active.menu_undo()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	def redo(self, *args):
+		if self.active:
+			self.active.menu_redo()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	def cut(self, *args):
+		if self.active:
+			self.active.menu_cut()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	def copy(self, *args):
+		if self.active:
+			self.active.menu_copy()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	def paste(self, *args):
+		if self.active:
+			self.active.menu_paste()
+		else:
+			EasyDialogs.Message("No active window?")
+
+	def clear(self, *args):
+		if self.active:
+			self.active.menu_clear()
+		else:
+			EasyDialogs.Message("No active window?")
+		
+	#
+	# Other stuff
+	#	
+
+	def idle(self, event):
+		if self.active:
+			self.active.do_idle(event)
+
+def main():
+	Mlte.TXNInitTextension(0)
+	try:
+		App = Mlted()
+		App.mainloop()
+	finally:
+		Mlte.TXNTerminateTextension()
+	
+if __name__ == '__main__':
+	main()
+