wordwrap.py
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#----------------------------------------------------------------------
# Name: wx.lib.wordwrap
# Purpose: Contains a function to aid in word-wrapping some text
#
# Author: Robin Dunn
#
# Created: 15-Oct-2006
# RCS-ID: $Id$
# Copyright: (c) 2006 by Total Control Software
# Licence: wxWindows license
#----------------------------------------------------------------------
def wordwrap(text, width, dc, breakLongWords=True, margin=0):
"""
Returns a copy of text with newline characters inserted where long
lines should be broken such that they will fit within the given
width, with the given margin left and right, on the given `wx.DC`
using its current font settings. By default words that are wider
than the margin-adjusted width will be broken at the nearest
character boundary, but this can be disabled by passing ``False``
for the ``breakLongWords`` parameter.
"""
wrapped_lines = []
text = text.split('\n')
for line in text:
pte = dc.GetPartialTextExtents(line)
wid = ( width - (2*margin+1)*dc.GetTextExtent(' ')[0]
- max([0] + [pte[i]-pte[i-1] for i in range(1,len(pte))]) )
idx = 0
start = 0
startIdx = 0
spcIdx = -1
while idx < len(pte):
# remember the last seen space
if line[idx] == ' ':
spcIdx = idx
# have we reached the max width?
if pte[idx] - start > wid and (spcIdx != -1 or breakLongWords):
if spcIdx != -1:
idx = min(spcIdx + 1, len(pte) - 1)
wrapped_lines.append(' '*margin + line[startIdx : idx] + ' '*margin)
start = pte[idx]
startIdx = idx
spcIdx = -1
idx += 1
wrapped_lines.append(' '*margin + line[startIdx : idx] + ' '*margin)
return '\n'.join(wrapped_lines)
if __name__ == '__main__':
import wx
class TestPanel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
self.tc = wx.TextCtrl(self, -1, "", (20,20), (150,150), wx.TE_MULTILINE)
self.Bind(wx.EVT_TEXT, self.OnDoUpdate, self.tc)
self.Bind(wx.EVT_SIZE, self.OnSize)
def OnSize(self, evt):
wx.CallAfter(self.OnDoUpdate, None)
def OnDoUpdate(self, evt):
WIDTH = self.GetSize().width - 220
HEIGHT = 200
bmp = wx.EmptyBitmap(WIDTH, HEIGHT)
mdc = wx.MemoryDC(bmp)
mdc.SetBackground(wx.Brush("white"))
mdc.Clear()
mdc.SetPen(wx.Pen("black"))
mdc.SetFont(wx.Font(10, wx.SWISS, wx.NORMAL, wx.NORMAL))
mdc.DrawRectangle(0,0, WIDTH, HEIGHT)
text = wordwrap(self.tc.GetValue(), WIDTH-2, mdc, False)
#print repr(text)
mdc.DrawLabel(text, (1,1, WIDTH-2, HEIGHT-2))
del mdc
dc = wx.ClientDC(self)
dc.DrawBitmap(bmp, 200, 20)
app = wx.App(False)
frm = wx.Frame(None, title="Test wordWrap")
pnl = TestPanel(frm)
frm.Show()
app.MainLoop()