263 lines
9.3 KiB
Python
263 lines
9.3 KiB
Python
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from wxPython.wx import wxLayoutConstraints,\
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wxTop, wxLeft, wxBottom, wxRight, \
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wxHeight, wxWidth, wxCentreX, wxCentreY
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import re,string
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class Layoutf(wxLayoutConstraints):
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"""
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The class Layoutf(wxLayoutConstraints) presents a simplification
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of the wxLayoutConstraints syntax. The name Layoutf is choosen
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because of the similarity with C's printf function.
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Quick Example:
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lc = Layoutf('t=t#1;l=r10#2;r!100;h%h50#1', (self, self.panel))
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is equivalent to
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lc = wxLayoutContraints()
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lc.top.SameAs(self, wxTop)
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lc.left.SameAs(self.panel, wxRight, 10)
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lc.right.Absolute(100)
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lc.height.PercentOf(self, wxHeight, 50)
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Usage:
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You can give a constraint string to the Layoutf constructor,
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or use the 'pack' method. The following are equivalent:
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lc = Layoutf('t=t#1;l=r#2;r!100;h%h50#1', (self, self.panel))
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and
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lc = Layoutf()
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lc.pack('t=t#1;l=r#2;r!100;h%h50#1', (self, self.panel))
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Besides 'pack' there's also 'debug_pack' which does not set
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constraints, but prints traditional wxLayoutConstraint calls to
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stdout.
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The calls to the Layoutf constructor and pack methods have
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the following argument list:
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(constraint_string, objects_tuple)
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Constraint String syntax:
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Constraint directives are separated by semi-colons. You
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generally (always?) need four directives to completely describe a
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subwindow's location.
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A single directive has either of the following forms:
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1. <own attribute><compare operation>[numerical argument]
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for example r!100 -> lc.right.Absolute(100) )
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and w* -> lc.width.AsIs()
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2. <own attribute><compare operation>[numerical argument]
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#<compare object nr.>
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for example t_10#2 (lc.top.Below(<second obj>, 10)
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3. <own attribute><compare operation><compare attribute>
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[numerical argument]#<compare object nr.>
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for example w%h50#2 ( lc.width.PercentOf(<second obj>,
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wxHeight, 50) and t=b#1 ( lc.top.SameAs(<first obj>,
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wxBottom) )
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Which one you need is defined by the <compare operation>
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type. The following take type 1 (no object to compare with):
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'!': 'Absolute', '?': 'Unconstrained', '*': 'AsIs'
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These take type 2 (need to be compared with another object)
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'<': 'LeftOf', '>': 'RightOf', '^': 'Above', '_': 'Below'
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These take type 3 (need to be compared to another object
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attribute)
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'=': 'SameAs', '%': 'PercentOf'
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For all types, the <own attribute> letter can be any of
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't': 'top', 'l': 'left', 'b': 'bottom',
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'r': 'right', 'h': 'height', 'w': 'width',
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'x': 'centreX', 'y': 'centreY'
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If the operation takes an (optional) numerical argument, place it
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in [numerical argument]. For type 3 directives, the <compare
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attribute> letter can be any of
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't': 'wxTop', 'l': 'wxLeft', 'b': 'wxBottom'
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'r': 'wxRight', 'h': 'wxHeight', 'w': 'wxWidth',
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'x': 'wxCentreX', 'y': 'wxCentreY'
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Note that these are the same letters as used for <own attribute>,
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so you'll only need to remember one set. Finally, the object
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whose attribute is refered to, is specified by #<compare object
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nr>, where <compare object nr> is the 1-based (stupid, I know,
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but I've gotten used to it) index of the object in the
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objects_tuple argument.
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Bugs:
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Not entirely happy about the logic in the order of arguments
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after the <compare operation> character.
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Not all wxLayoutConstraint methods are included in the
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syntax. However, the type 3 directives are generally the most
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used. Further excuse: wxWindows layout constraints are at the
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time of this writing not documented.
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"""
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attr_d = { 't': 'top', 'l': 'left', 'b': 'bottom',
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'r': 'right', 'h': 'height', 'w': 'width',
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'x': 'centreX', 'y': 'centreY' }
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op_d = { '=': 'SameAs', '%': 'PercentOf', '<': 'LeftOf',
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'>': 'RightOf', '^': 'Above', '_': 'Below',
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'!': 'Absolute', '?': 'Unconstrained', '*': 'AsIs' }
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cmp_d = { 't': 'wxTop', 'l': 'wxLeft', 'b': 'wxBottom',
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'r': 'wxRight', 'h': 'wxHeight', 'w': 'wxWidth',
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'x': 'wxCentreX', 'y': 'wxCentreY' }
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rexp1 = re.compile('^\s*([tlrbhwxy])\s*([!\?\*])\s*(\d*)\s*$')
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rexp2 = re.compile('^\s*([tlrbhwxy])\s*([=%<>^_])\s*([tlrbhwxy]?)\s*(\d*)\s*#(\d+)\s*$')
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def __init__(self,pstr=None,winlist=None):
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wxLayoutConstraints.__init__(self)
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if pstr:
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self.pack(pstr,winlist)
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def pack(self, pstr, winlist):
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pstr = string.lower(pstr)
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for item in string.split(pstr,';'):
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m = self.rexp1.match(item)
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if m:
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g = list(m.groups())
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attr = getattr(self, self.attr_d[g[0]])
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func = getattr(attr, self.op_d[g[1]])
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if g[1] == '!':
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func(int(g[2]))
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else:
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func()
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continue
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m = self.rexp2.match(item)
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if not m: raise ValueError
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g = list(m.groups())
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attr = getattr(self, self.attr_d[g[0]])
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func = getattr(attr, self.op_d[g[1]])
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if g[3]: g[3] = int(g[3])
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else: g[3] = None;
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g[4] = int(g[4]) - 1
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if g[1] in '<>^_':
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if g[3]: func(winlist[g[4]], g[3])
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else: func(winlist[g[4]])
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else:
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cmp = eval(self.cmp_d[g[2]])
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if g[3]: func(winlist[g[4]], cmp, g[3])
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else: func(winlist[g[4]], cmp)
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def debug_pack(self, pstr, winlist):
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pstr = string.lower(pstr)
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for item in string.split(pstr,';'):
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m = self.rexp1.match(item)
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if m:
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g = list(m.groups())
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attr = getattr(self, self.attr_d[g[0]])
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func = getattr(attr, self.op_d[g[1]])
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if g[1] == '!':
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print "%s.%s.%s(%s)" % \
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('self',self.attr_d[g[0]],self.op_d[g[1]],g[2])
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else:
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print "%s.%s.%s()" % \
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('self',self.attr_d[g[0]],self.op_d[g[1]])
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continue
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m = self.rexp2.match(item)
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if not m: raise ValueError
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g = list(m.groups())
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if g[3]: g[3] = int(g[3])
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else: g[3] = 0;
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g[4] = int(g[4]) - 1
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if g[1] in '<>^_':
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if g[3]: print "%s.%s.%s(%s,%d)" % \
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('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]],
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g[3])
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else: print "%s.%s.%s(%s)" % \
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('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]])
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else:
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if g[3]: print "%s.%s.%s(%s,%s,%d)" % \
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('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]],
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self.cmp_d[g[2]],g[3])
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else: print "%s.%s.%s(%s,%s)" % \
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('self',self.attr_d[g[0]],self.op_d[g[1]],winlist[g[4]],
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self.cmp_d[g[2]])
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if __name__=='__main__':
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from wxPython.wx import *
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class TestLayoutf(wxFrame):
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def __init__(self, parent):
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wxFrame.__init__(self, parent, -1, 'Test Layout Constraints',
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wxPyDefaultPosition, wxSize(500, 300))
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self.SetAutoLayout(true)
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EVT_BUTTON(self, 100, self.OnButton)
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EVT_BUTTON(self, 101, self.OnAbout)
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self.panelA = wxWindow(self, -1, wxPyDefaultPosition, wxPyDefaultSize, wxSIMPLE_BORDER)
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self.panelA.SetBackgroundColour(wxBLUE)
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self.panelA.SetConstraints(Layoutf('t=t10#1;l=l10#1;b=b10#1;r%r50#1',(self,)))
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self.panelB = wxWindow(self, -1, wxPyDefaultPosition, wxPyDefaultSize, wxSIMPLE_BORDER)
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self.panelB.SetBackgroundColour(wxRED)
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self.panelB.SetConstraints(Layoutf('t=t10#1;r=r10#1;b%b30#1;l>10#2', (self,self.panelA)))
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self.panelC = wxWindow(self, -1, wxPyDefaultPosition, wxPyDefaultSize, wxSIMPLE_BORDER)
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self.panelC.SetBackgroundColour(wxWHITE)
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self.panelC.SetConstraints(Layoutf('t_10#3;r=r10#1;b=b10#1;l>10#2', (self,self.panelA,self.panelB)))
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b = wxButton(self.panelA, 101, ' About: ')
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b.SetConstraints(Layoutf('X=X#1;Y=Y#1;h*;w%w50#1', (self.panelA,)))
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b = wxButton(self.panelB, 100, ' Panel B ')
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b.SetConstraints(Layoutf('t=t2#1;r=r4#1;h*;w*', (self.panelB,)))
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self.panelD = wxWindow(self.panelC, -1, wxPyDefaultPosition, wxPyDefaultSize, wxSIMPLE_BORDER)
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self.panelD.SetBackgroundColour(wxGREEN)
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self.panelD.SetConstraints(Layoutf('b%h50#1;r%w50#1;h=h#2;w=w#2', (self.panelC, b)))
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b = wxButton(self.panelC, 100, ' Panel C ')
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b.SetConstraints(Layoutf('t_#1;l>#1;h*;w*', (self.panelD,)))
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wxStaticText(self.panelD, -1, "Panel D", wxPoint(4, 4)).SetBackgroundColour(wxGREEN)
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def OnButton(self, event):
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self.Close(true)
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def OnAbout(self, event):
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try:
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from dialogs import wxScrolledMessageDialog
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msg = wxScrolledMessageDialog(self, Layoutf.__doc__, "about")
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msg.ShowModal()
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except:
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print msg
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def OnCloseWindow(self, event):
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self.Destroy()
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class TestApp(wxApp):
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def OnInit(self):
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frame = TestLayoutf(NULL)
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frame.Show(1)
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self.SetTopWindow(frame)
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return 1
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app = TestApp(0)
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app.MainLoop()
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