# 12/09/2003 - Jeff Grimmett (grimmtooth@softhome.net)
#
# o Updated for wx namespace
#
# 12/18/2003 - Jeff Grimmett (grimmtooth@softhome.net)
#
# o wxScrolledMessageDialog -> ScrolledMessageDialog
#
import re
import wx
class Layoutf(wx.LayoutConstraints):
"""
The class Layoutf(wxLayoutConstraints) presents a simplification
of the wxLayoutConstraints syntax. The name Layoutf is choosen
because of the similarity with C's printf function.
Quick Example:
lc = Layoutf('t=t#1;l=r10#2;r!100;h%h50#1', (self, self.panel))
is equivalent to
lc = wxLayoutContraints()
lc.top.SameAs(self, wxTop)
lc.left.SameAs(self.panel, wxRight, 10)
lc.right.Absolute(100)
lc.height.PercentOf(self, wxHeight, 50)
Usage:
You can give a constraint string to the Layoutf constructor,
or use the 'pack' method. The following are equivalent:
lc = Layoutf('t=t#1;l=r#2;r!100;h%h50#1', (self, self.panel))
and
lc = Layoutf()
lc.pack('t=t#1;l=r#2;r!100;h%h50#1', (self, self.panel))
Besides 'pack' there's also 'debug_pack' which does not set
constraints, but prints traditional wxLayoutConstraint calls to
stdout.
The calls to the Layoutf constructor and pack methods have
the following argument list:
(constraint_string, objects_tuple)
Constraint String syntax:
Constraint directives are separated by semi-colons. You
generally (always?) need four directives to completely describe a
subwindow's location.
A single directive has either of the following forms:
1. <own attribute><compare operation>[numerical argument]
for example r!100 -> lc.right.Absolute(100) )
and w* -> lc.width.AsIs()
2. <own attribute><compare operation>[numerical argument]
#<compare object nr.>
for example t_10#2 (lc.top.Below(<second obj>, 10)
3. <own attribute><compare operation><compare attribute>
[numerical argument]#<compare object nr.>
for example w%h50#2 ( lc.width.PercentOf(<second obj>,
wxHeight, 50) and t=b#1 ( lc.top.SameAs(<first obj>,
wxBottom) )
Which one you need is defined by the <compare operation>
type. The following take type 1 (no object to compare with):
'!': 'Absolute', '?': 'Unconstrained', '*': 'AsIs'
These take type 2 (need to be compared with another object)
'<': 'LeftOf', '>': 'RightOf', '^': 'Above', '_': 'Below'
These take type 3 (need to be compared to another object
attribute)
'=': 'SameAs', '%': 'PercentOf'
For all types, the <own attribute> letter can be any of
't': 'top', 'l': 'left', 'b': 'bottom',
'r': 'right', 'h': 'height', 'w': 'width',
'x': 'centreX', 'y': 'centreY'
If the operation takes an (optional) numerical argument, place it
in [numerical argument]. For type 3 directives, the <compare
attribute> letter can be any of
't': 'wxTop', 'l': 'wxLeft', 'b': 'wxBottom'
'r': 'wxRight', 'h': 'wxHeight', 'w': 'wxWidth',
'x': 'wxCentreX', 'y': 'wxCentreY'
Note that these are the same letters as used for <own attribute>,
so you'll only need to remember one set. Finally, the object
whose attribute is refered to, is specified by #<compare object
nr>, where <compare object nr> is the 1-based (stupid, I know,
but I've gotten used to it) index of the object in the
objects_tuple argument.
Bugs:
Not entirely happy about the logic in the order of arguments
after the <compare operation> character.
Not all wxLayoutConstraint methods are included in the
syntax. However, the type 3 directives are generally the most
used. Further excuse: wxWindows layout constraints are at the
time of this writing not documented.
"""
attr_d = { 't': 'top', 'l': 'left', 'b': 'bottom',
'r': 'right', 'h': 'height', 'w': 'width',
'x': 'centreX', 'y': 'centreY' }
op_d = { '=': 'SameAs', '%': 'PercentOf', '<': 'LeftOf',
'>': 'RightOf', '^': 'Above', '_': 'Below',
'!': 'Absolute', '?': 'Unconstrained', '*': 'AsIs' }
cmp_d = { 't': 'wx.Top', 'l': 'wx.Left', 'b': 'wx.Bottom',
'r': 'wx.Right', 'h': 'wx.Height', 'w': 'wx.Width',
'x': 'wx.CentreX', 'y': 'wx.CentreY' }
rexp1 = re.compile('^\s*([tlrbhwxy])\s*([!\?\*])\s*(\d*)\s*$')
rexp2 = re.compile('^\s*([tlrbhwxy])\s*([=%<>^_])\s*([tlrbhwxy]?)\s*(\d*)\s*#(\d+)\s*$')
def __init__(self,pstr=None,winlist=None):
wx.LayoutConstraints.__init__(self)
if pstr:
self.pack(pstr,winlist)
def pack(self, pstr, winlist):
pstr = pstr.lower()
for item in pstr.split(';'):
m = self.rexp1.match(item)
if m:
g = list(m.groups())
attr = getattr(self, self.attr_d[g[0]])
func = getattr(attr, self.op_d[g[1]])
if g[1] == '!':
func(int(g[2]))
else:
func()
continue
m = self.rexp2.match(item)
if not m: raise ValueError
g = list(m.groups())
attr = getattr(self, self.attr_d[g[0]])
func = getattr(attr, self.op_d[g[1]])
if g[3]: g[3] = int(g[3])
else: g[3] = None;
g[4] = int(g[4]) - 1
if g[1] in '<>^_':
if g[3]: func(winlist[g[4]], g[3])
else: func(winlist[g[4]])
else:
cmp = eval(self.cmp_d[g[2]])
if g[3]: func(winlist[g[4]], cmp, g[3])
else: func(winlist[g[4]], cmp)
def debug_pack(self, pstr, winlist):
pstr = pstr.lower()
for item in pstr.split(';'):
m = self.rexp1.match(item)
if m:
g = list(m.groups())
attr = getattr(self, self.attr_d[g[0]])
func = getattr(attr, self.op_d[g[1]])
if g[1] == '!':
print "%s.%s.%s(%s)" % \
('self',self.attr_d[g[0]],self.op_d[g[1]],g[2])
else:
print "%s.%s.%s()" % \
('self',self.attr_d[g[0]],self.op_d[g[1]])
continue
m = self.rexp2.match(item)
if not m: raise ValueError
g = list(m.groups())
if g[3]: g[3] = int(g[3])
else: g[3] = 0;
g[4] = int(g[4]) - 1
if g[1] in '<>^_':
if g[3]: print "%s.%s.%s(%s,%d)" % \
('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]],
g[3])
else: print "%s.%s.%s(%s)" % \
('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]])
else:
if g[3]: print "%s.%s.%s(%s,%s,%d)" % \
('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]],
self.cmp_d[g[2]],g[3])
else: print "%s.%s.%s(%s,%s)" % \
('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]],
self.cmp_d[g[2]])
if __name__=='__main__':
class TestLayoutf(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, -1, 'Test Layout Constraints',
wx.DefaultPosition, (500, 300))
self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
self.SetAutoLayout(True)
self.panelA = wx.Window(self, -1, style=wx.SIMPLE_BORDER)
self.panelA.SetBackgroundColour(wx.BLUE)
self.panelA.SetConstraints(Layoutf('t=t10#1;l=l10#1;b=b10#1;r%r50#1',(self,)))
self.panelB = wx.Window(self, -1, style=wx.SIMPLE_BORDER)
self.panelB.SetBackgroundColour(wx.RED)
self.panelB.SetConstraints(Layoutf('t=t10#1;r=r10#1;b%b30#1;l>10#2', (self,self.panelA)))
self.panelC = wx.Window(self, -1, style=wx.SIMPLE_BORDER)
self.panelC.SetBackgroundColour(wx.WHITE)
self.panelC.SetConstraints(Layoutf('t_10#3;r=r10#1;b=b10#1;l>10#2', (self,self.panelA,self.panelB)))
b = wx.Button(self.panelA, -1, ' About: ')
b.SetConstraints(Layoutf('X=X#1;Y=Y#1;h*;w%w50#1', (self.panelA,)))
self.Bind(wx.EVT_BUTTON, self.OnAbout, b)
b = wx.Button(self.panelB, 100, ' Panel B ')
b.SetConstraints(Layoutf('t=t2#1;r=r4#1;h*;w*', (self.panelB,)))
self.panelD = wx.Window(self.panelC, -1, style=wx.SIMPLE_BORDER)
self.panelD.SetBackgroundColour(wx.GREEN)
self.panelD.SetConstraints(Layoutf('b%h50#1;r%w50#1;h=h#2;w=w#2', (self.panelC, b)))
b = wx.Button(self.panelC, -1, ' Panel C ')
b.SetConstraints(Layoutf('t_#1;l>#1;h*;w*', (self.panelD,)))
self.Bind(wx.EVT_BUTTON, self.OnButton, b)
wx.StaticText(self.panelD, -1, "Panel D", (4, 4)).SetBackgroundColour(wx.GREEN)
def OnButton(self, event):
self.Close(True)
def OnAbout(self, event):
import wx.lib.dialogs
msg = wx.lib.dialogs.ScrolledMessageDialog(self, Layoutf.__doc__, "about")
msg.ShowModal()
msg.Destroy()
def OnCloseWindow(self, event):
self.Destroy()
class TestApp(wx.App):
def OnInit(self):
frame = TestLayoutf(None)
frame.Show(1)
self.SetTopWindow(frame)
return 1
app = TestApp(0)
app.MainLoop()
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