Add a utility function that can calculate word-wrap line breaks, and

use it in the AboutBox demo.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42055 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/lib/wordwrap.py

@@ -0,0 +1,91 @@
+#----------------------------------------------------------------------
+# Name:        wx.lib.wrap
+# 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):
+    """
+    Returns a copy of text with newline characters inserted where long
+    lines should be broken such that they will fit within the given
+    width, on the given `wx.DC` using its current font settings.  By
+    default words that are wider than 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)
+        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 > width and (spcIdx != -1 or breakLongWords):
+                if spcIdx != -1:
+                    idx = spcIdx + 1
+                wrapped_lines.append( line[startIdx : idx] )
+                start = pte[idx]
+                startIdx = idx
+                spcIdx = -1
+
+            idx += 1
+
+        wrapped_lines.append( line[startIdx : idx] )
+
+    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)
+
+        def OnDoUpdate(self, evt):
+            WIDTH = 200
+            bmp = wx.EmptyBitmap(WIDTH, WIDTH)
+            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, WIDTH)
+            
+            text = wordwrap(self.tc.GetValue(), WIDTH-2, mdc, False)
+            #print repr(text)
+            mdc.DrawLabel(text, (1,1, WIDTH-2, WIDTH-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()
+
+