wxPython/wx/lib/editor/editor.py

   1 #----------------------------------------------------------------------
   2 # Name:        wxPython.lib.editor.Editor
   3 # Purpose:     An intelligent text editor with colorization capabilities.
   4 #
   5 # Original
   6 # Authors:      Dirk Holtwic, Robin Dunn
   7 #
   8 # New
   9 # Authors:      Adam Feuer, Steve Howell
  10 #
  11 # History:
  12 #   This code used to support a fairly complex subclass that did
  13 #   syntax coloring and outliner collapse mode.  Adam and Steve
  14 #   inherited the code, and added a lot of basic editor
  15 #   functionality that had not been there before, such as cut-and-paste.
  16 #
  17 #
  18 # Created:     15-Dec-1999
  19 # RCS-ID:      $Id$
  20 # Copyright:   (c) 1999 by Dirk Holtwick, 1999
  21 # Licence:     wxWindows license
  22 #----------------------------------------------------------------------
  23 # 12/14/2003 - Jeff Grimmett (grimmtooth@softhome.net)
  24 #
  25 # o 2.5 compatability update.
  26 #
  27 # 12/21/2003 - Jeff Grimmett (grimmtooth@softhome.net)
  28 #
  29 # o wxEditor -> Editor
  30 #
  31
  32 import  os
  33 import  time
  34
  35 import  wx
  36
  37 import  selection
  38 import  images
  39
  40 #----------------------------
  41
  42 def ForceBetween(min, val, max):
  43     if val  > max:
  44         return max
  45     if val < min:
  46         return min
  47     return val
  48
  49
  50 def LineTrimmer(lineOfText):
  51     if len(lineOfText) == 0:
  52         return ""
  53     elif lineOfText[-1] == '\r':
  54         return lineOfText[:-1]
  55     else:
  56         return lineOfText
  57
  58 def LineSplitter(text):
  59     return map (LineTrimmer, text.split('\n'))
  60
  61
  62 #----------------------------
  63
  64 class Scroller:
  65     def __init__(self, parent):
  66         self.parent = parent
  67         self.ow = 0
  68         self.oh = 0
  69         self.ox = 0
  70         self.oy = 0
  71
  72     def SetScrollbars(self, fw, fh, w, h, x, y):
  73         if (self.ow != w or self.oh != h or self.ox != x or self.oy != y):
  74             self.parent.SetScrollbars(fw, fh, w, h, x, y)
  75             self.ow = w
  76             self.oh = h
  77             self.ox = x
  78             self.oy = y
  79
  80 #----------------------------------------------------------------------
  81
  82 class Editor(wx.ScrolledWindow):
  83
  84     def __init__(self, parent, id,
  85                  pos=wx.DefaultPosition, size=wx.DefaultSize, style=0):
  86
  87         wx.ScrolledWindow.__init__(self, parent, id,
  88                                   pos, size,
  89                                   style|wx.WANTS_CHARS)
  90
  91         self.isDrawing = False
  92
  93         self.InitCoords()
  94         self.InitFonts()
  95         self.SetColors()
  96         self.MapEvents()
  97         self.LoadImages()
  98         self.InitDoubleBuffering()
  99         self.InitScrolling()
 100         self.SelectOff()
 101         self.SetFocus()
 102         self.SetText([""])
 103         self.SpacesPerTab = 4
 104
 105 ##------------------ Init stuff
 106
 107     def InitCoords(self):
 108         self.cx = 0
 109         self.cy = 0
 110         self.oldCx = 0
 111         self.oldCy = 0
 112         self.sx = 0
 113         self.sy = 0
 114         self.sw = 0
 115         self.sh = 0
 116         self.sco_x = 0
 117         self.sco_y = 0
 118
 119     def MapEvents(self):
 120         self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
 121         self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
 122         self.Bind(wx.EVT_MOTION, self.OnMotion)
 123         self.Bind(wx.EVT_SCROLLWIN, self.OnScroll)
 124         self.Bind(wx.EVT_CHAR, self.OnChar)
 125         self.Bind(wx.EVT_PAINT, self.OnPaint)
 126         self.Bind(wx.EVT_SIZE, self.OnSize)
 127         self.Bind(wx.EVT_WINDOW_DESTROY, self.OnDestroy)
 128         self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
 129
 130 ##------------------- Platform-specific stuff
 131
 132     def NiceFontForPlatform(self):
 133         if wx.Platform == "__WXMSW__":
 134             return wx.Font(10, wx.MODERN, wx.NORMAL, wx.NORMAL)
 135         else:
 136             return wx.Font(12, wx.MODERN, wx.NORMAL, wx.NORMAL, False)
 137
 138     def UnixKeyHack(self, key):
 139         #
 140         # this will be obsolete when we get the new wxWindows patch
 141         #
 142         # 12/14/03 - jmg
 143         #
 144         # Which patch? I don't know if this is needed, but I don't know
 145         # why it's here either. Play it safe; leave it in.
 146         #
 147         if key <= 26:
 148             key += ord('a') - 1
 149         return key
 150
 151 ##-------------------- UpdateView/Cursor code
 152
 153     def OnSize(self, event):
 154         self.AdjustScrollbars()
 155         self.SetFocus()
 156
 157     def SetCharDimensions(self):
 158         # TODO: We need a code review on this.  It appears that Linux
 159         # improperly reports window dimensions when the scrollbar's there.
 160         self.bw, self.bh = self.GetClientSize()
 161
 162         if wx.Platform == "__WXMSW__":
 163             self.sh = self.bh / self.fh
 164             self.sw = (self.bw / self.fw) - 1
 165         else:
 166             self.sh = self.bh / self.fh
 167             if self.LinesInFile() >= self.sh:
 168                 self.bw = self.bw - wx.SystemSettings_GetMetric(wx.SYS_VSCROLL_X)
 169                 self.sw = (self.bw / self.fw) - 1
 170
 171             self.sw = (self.bw / self.fw) - 1
 172             if self.CalcMaxLineLen() >= self.sw:
 173                 self.bh = self.bh - wx.SystemSettings_GetMetric(wx.SYS_HSCROLL_Y)
 174                 self.sh = self.bh / self.fh
 175
 176
 177     def UpdateView(self, dc = None):
 178         if dc is None:
 179             dc = wx.ClientDC(self)
 180         if dc.Ok():
 181             self.SetCharDimensions()
 182             self.KeepCursorOnScreen()
 183             self.DrawSimpleCursor(0,0, dc, True)
 184             self.Draw(dc)
 185
 186     def OnPaint(self, event):
 187         dc = wx.PaintDC(self)
 188         if self.isDrawing:
 189             return
 190         self.isDrawing = True
 191         self.UpdateView(dc)
 192         wx.CallAfter(self.AdjustScrollbars)
 193         self.isDrawing = False
 194
 195     def OnEraseBackground(self, evt):
 196         pass
 197
 198 ##-------------------- Drawing code
 199
 200     def InitFonts(self):
 201         dc = wx.ClientDC(self)
 202         self.font = self.NiceFontForPlatform()
 203         dc.SetFont(self.font)
 204         self.fw = dc.GetCharWidth()
 205         self.fh = dc.GetCharHeight()
 206
 207     def SetColors(self):
 208         self.fgColor = wx.NamedColour('black')
 209         self.bgColor = wx.NamedColour('white')
 210         self.selectColor = wx.Colour(238, 220, 120)  # r, g, b = emacsOrange
 211
 212     def InitDoubleBuffering(self):
 213         pass
 214
 215     def DrawEditText(self, t, x, y, dc):
 216         dc.DrawText(t, (x * self.fw, y * self.fh))
 217
 218     def DrawLine(self, line, dc):
 219         if self.IsLine(line):
 220             l   = line
 221             t   = self.lines[l]
 222             dc.SetTextForeground(self.fgColor)
 223             fragments = selection.Selection(
 224                 self.SelectBegin, self.SelectEnd,
 225                 self.sx, self.sw, line, t)
 226             x = 0
 227             for (data, selected) in fragments:
 228                 if selected:
 229                     dc.SetTextBackground(self.selectColor)
 230                     if x == 0 and len(data) == 0 and len(fragments) == 1:
 231                         data = ' '
 232                 else:
 233                     dc.SetTextBackground(self.bgColor)
 234                 self.DrawEditText(data, x, line - self.sy, dc)
 235                 x += len(data)
 236
 237     def Draw(self, odc=None):
 238         if not odc:
 239             odc = wx.ClientDC(self)
 240
 241         bmp = wx.EmptyBitmap(max(1,self.bw), max(1,self.bh))
 242         dc = wx.BufferedDC(odc, bmp)
 243         if dc.Ok():
 244             dc.SetFont(self.font)
 245             dc.SetBackgroundMode(wx.SOLID)
 246             dc.SetTextBackground(self.bgColor)
 247             dc.SetTextForeground(self.fgColor)
 248             dc.Clear()
 249             for line in range(self.sy, self.sy + self.sh):
 250                 self.DrawLine(line, dc)
 251             if len(self.lines) < self.sh + self.sy:
 252                 self.DrawEofMarker(dc)
 253             self.DrawCursor(dc)
 254
 255 ##------------------ eofMarker stuff
 256
 257     def LoadImages(self):
 258         self.eofMarker = images.GetBitmap(images.EofImageData)
 259
 260     def DrawEofMarker(self,dc):
 261         x = 0
 262         y = (len(self.lines) - self.sy) * self.fh
 263         hasTransparency = 1
 264         dc.DrawBitmap(self.eofMarker, (x, y), hasTransparency)
 265
 266 ##------------------ cursor-related functions
 267
 268     def DrawCursor(self, dc = None):
 269         if not dc:
 270             dc = wx.ClientDC(self)
 271
 272         if (self.LinesInFile())<self.cy: #-1 ?
 273             self.cy = self.LinesInFile()-1
 274         s = self.lines[self.cy]
 275
 276         x = self.cx - self.sx
 277         y = self.cy - self.sy
 278         self.DrawSimpleCursor(x, y, dc)
 279
 280
 281     def DrawSimpleCursor(self, xp, yp, dc = None, old=False):
 282         if not dc:
 283             dc = wx.ClientDC(self)
 284
 285         if old:
 286             xp = self.sco_x
 287             yp = self.sco_y
 288
 289         szx = self.fw
 290         szy = self.fh
 291         x = xp * szx
 292         y = yp * szy
 293         dc.Blit((x,y), (szx,szy), dc, (x,y), wx.SRC_INVERT)
 294         self.sco_x = xp
 295         self.sco_y = yp
 296
 297 ##-------- Enforcing screen boundaries, cursor movement
 298
 299     def CalcMaxLineLen(self):
 300         """get length of longest line on screen"""
 301         maxlen = 0
 302         for line in self.lines[self.sy:self.sy+self.sh]:
 303             if len(line) >maxlen:
 304                 maxlen = len(line)
 305         return maxlen
 306
 307     def KeepCursorOnScreen(self):
 308         self.sy = ForceBetween(max(0, self.cy-self.sh), self.sy, self.cy)
 309         self.sx = ForceBetween(max(0, self.cx-self.sw), self.sx, self.cx)
 310         self.AdjustScrollbars()
 311
 312     def HorizBoundaries(self):
 313         self.SetCharDimensions()
 314         maxLineLen = self.CalcMaxLineLen()
 315         self.sx = ForceBetween(0, self.sx, max(self.sw, maxLineLen - self.sw + 1))
 316         self.cx = ForceBetween(self.sx, self.cx, self.sx + self.sw - 1)
 317
 318     def VertBoundaries(self):
 319         self.SetCharDimensions()
 320         self.sy = ForceBetween(0, self.sy, max(self.sh, self.LinesInFile() - self.sh + 1))
 321         self.cy = ForceBetween(self.sy, self.cy, self.sy + self.sh - 1)
 322
 323     def cVert(self, num):
 324         self.cy = self.cy + num
 325         self.cy = ForceBetween(0, self.cy, self.LinesInFile() - 1)
 326         self.sy = ForceBetween(self.cy - self.sh + 1, self.sy, self.cy)
 327         self.cx = min(self.cx, self.CurrentLineLength())
 328
 329     def cHoriz(self, num):
 330         self.cx = self.cx + num
 331         self.cx = ForceBetween(0, self.cx, self.CurrentLineLength())
 332         self.sx = ForceBetween(self.cx - self.sw + 1, self.sx, self.cx)
 333
 334     def AboveScreen(self, row):
 335         return row < self.sy
 336
 337     def BelowScreen(self, row):
 338         return row >= self.sy + self.sh
 339
 340     def LeftOfScreen(self, col):
 341         return col < self.sx
 342
 343     def RightOfScreen(self, col):
 344         return col >= self.sx + self.sw
 345
 346 ##----------------- data structure helper functions
 347
 348     def GetText(self):
 349         return self.lines
 350
 351     def SetText(self, lines):
 352         self.InitCoords()
 353         self.lines = lines
 354         self.UnTouchBuffer()
 355         self.SelectOff()
 356         self.AdjustScrollbars()
 357         self.UpdateView(None)
 358
 359     def IsLine(self, lineNum):
 360         return (0<=lineNum) and (lineNum<self.LinesInFile())
 361
 362     def GetTextLine(self, lineNum):
 363         if self.IsLine(lineNum):
 364             return self.lines[lineNum]
 365         return ""
 366
 367     def SetTextLine(self, lineNum, text):
 368         if self.IsLine(lineNum):
 369             self.lines[lineNum] = text
 370
 371     def CurrentLineLength(self):
 372         return len(self.lines[self.cy])
 373
 374     def LinesInFile(self):
 375         return len(self.lines)
 376
 377     def UnTouchBuffer(self):
 378         self.bufferTouched = False
 379
 380     def BufferWasTouched(self):
 381         return self.bufferTouched
 382
 383     def TouchBuffer(self):
 384         self.bufferTouched = True
 385
 386
 387 ##-------------------------- Mouse scroll timing functions
 388
 389     def InitScrolling(self):
 390         # we don't rely on the windows system to scroll for us; we just
 391         # redraw the screen manually every time
 392         self.EnableScrolling(False, False)
 393         self.nextScrollTime = 0
 394         self.SCROLLDELAY = 0.050 # seconds
 395         self.scrollTimer = wx.Timer(self)
 396         self.scroller = Scroller(self)
 397
 398     def CanScroll(self):
 399        if time.time() >  self.nextScrollTime:
 400            self.nextScrollTime = time.time() + self.SCROLLDELAY
 401            return True
 402        else:
 403            return False
 404
 405     def SetScrollTimer(self):
 406         oneShot = True
 407         self.scrollTimer.Start(1000*self.SCROLLDELAY/2, oneShot)
 408         self.Bind(wx.EVT_TIMER, self.OnTimer)
 409
 410     def OnTimer(self, event):
 411         screenX, screenY = wx.GetMousePosition()
 412         x, y = self.ScreenToClientXY(screenX, screenY)
 413         self.MouseToRow(y)
 414         self.MouseToCol(x)
 415         self.SelectUpdate()
 416
 417 ##-------------------------- Mouse off screen functions
 418
 419     def HandleAboveScreen(self, row):
 420         self.SetScrollTimer()
 421         if self.CanScroll():
 422             row = self.sy - 1
 423             row = max(0, row)
 424             self.cy = row
 425
 426     def HandleBelowScreen(self, row):
 427         self.SetScrollTimer()
 428         if self.CanScroll():
 429             row = self.sy + self.sh
 430             row  = min(row, self.LinesInFile() - 1)
 431             self.cy = row
 432
 433     def HandleLeftOfScreen(self, col):
 434         self.SetScrollTimer()
 435         if self.CanScroll():
 436             col = self.sx - 1
 437             col = max(0,col)
 438             self.cx = col
 439
 440     def HandleRightOfScreen(self, col):
 441         self.SetScrollTimer()
 442         if self.CanScroll():
 443             col = self.sx + self.sw
 444             col = min(col, self.CurrentLineLength())
 445             self.cx = col
 446
 447 ##------------------------ mousing functions
 448
 449     def MouseToRow(self, mouseY):
 450         row  = self.sy + (mouseY/ self.fh)
 451         if self.AboveScreen(row):
 452             self.HandleAboveScreen(row)
 453         elif self.BelowScreen(row):
 454             self.HandleBelowScreen(row)
 455         else:
 456             self.cy  = min(row, self.LinesInFile() - 1)
 457
 458     def MouseToCol(self, mouseX):
 459         col = self.sx + (mouseX / self.fw)
 460         if self.LeftOfScreen(col):
 461             self.HandleLeftOfScreen(col)
 462         elif self.RightOfScreen(col):
 463             self.HandleRightOfScreen(col)
 464         else:
 465             self.cx = min(col, self.CurrentLineLength())
 466
 467     def MouseToCursor(self, event):
 468         self.MouseToRow(event.GetY())
 469         self.MouseToCol(event.GetX())
 470
 471     def OnMotion(self, event):
 472         if event.LeftIsDown() and self.HasCapture():
 473             self.Selecting = True
 474             self.MouseToCursor(event)
 475             self.SelectUpdate()
 476
 477     def OnLeftDown(self, event):
 478         self.MouseToCursor(event)
 479         self.SelectBegin = (self.cy, self.cx)
 480         self.SelectEnd = None
 481         self.UpdateView()
 482         self.CaptureMouse()
 483
 484     def OnLeftUp(self, event):
 485         if not self.HasCapture():
 486             return
 487
 488         if self.SelectEnd is None:
 489             self.OnClick()
 490         else:
 491             self.Selecting = False
 492             self.SelectNotify(False, self.SelectBegin, self.SelectEnd)
 493
 494         self.ReleaseMouse()
 495         self.scrollTimer.Stop()
 496
 497
 498 #------------------------- Scrolling
 499
 500     def HorizScroll(self, event, eventType):
 501         maxLineLen = self.CalcMaxLineLen()
 502
 503         if eventType == wx.EVT_SCROLLWIN_LINEUP:
 504             self.sx -= 1
 505         elif eventType == wx.EVT_SCROLLWIN_LINEDOWN:
 506             self.sx += 1
 507         elif eventType == wx.EVT_SCROLLWIN_PAGEUP:
 508             self.sx -= self.sw
 509         elif eventType == wx.EVT_SCROLLWIN_PAGEDOWN:
 510             self.sx += self.sw
 511         elif eventType == wx.EVT_SCROLLWIN_TOP:
 512             self.sx = self.cx = 0
 513         elif eventType == wx.EVT_SCROLLWIN_BOTTOM:
 514             self.sx = maxLineLen - self.sw
 515             self.cx = maxLineLen
 516         else:
 517             self.sx = event.GetPosition()
 518
 519         self.HorizBoundaries()
 520
 521     def VertScroll(self, event, eventType):
 522         if   eventType == wx.EVT_SCROLLWIN_LINEUP:
 523             self.sy -= 1
 524         elif eventType == wx.EVT_SCROLLWIN_LINEDOWN:
 525             self.sy += 1
 526         elif eventType == wx.EVT_SCROLLWIN_PAGEUP:
 527             self.sy -= self.sh
 528         elif eventType == wx.EVT_SCROLLWIN_PAGEDOWN:
 529             self.sy += self.sh
 530         elif eventType == wx.EVT_SCROLLWIN_TOP:
 531             self.sy = self.cy = 0
 532         elif eventType == wx.EVT_SCROLLWIN_BOTTOM:
 533             self.sy = self.LinesInFile() - self.sh
 534             self.cy = self.LinesInFile()
 535         else:
 536             self.sy = event.GetPosition()
 537
 538         self.VertBoundaries()
 539
 540     def OnScroll(self, event):
 541         dir = event.GetOrientation()
 542         eventType = event.GetEventType()
 543         if dir == wx.HORIZONTAL:
 544             self.HorizScroll(event, eventType)
 545         else:
 546             self.VertScroll(event, eventType)
 547         self.UpdateView()
 548
 549
 550     def AdjustScrollbars(self):
 551         for i in range(2):
 552             self.SetCharDimensions()
 553             self.scroller.SetScrollbars(
 554                 self.fw, self.fh,
 555                 self.CalcMaxLineLen()+3, max(self.LinesInFile()+1, self.sh),
 556                 self.sx, self.sy)
 557
 558 #------------ backspace, delete, return
 559
 560     def BreakLine(self, event):
 561         if self.IsLine(self.cy):
 562             t = self.lines[self.cy]
 563             self.lines = self.lines[:self.cy] + [t[:self.cx],t[self.cx:]] + self.lines[self.cy+1:]
 564             self.cVert(1)
 565             self.cx = 0
 566             self.TouchBuffer()
 567
 568     def InsertChar(self,char):
 569         if self.IsLine(self.cy):
 570             t = self.lines[self.cy]
 571             t = t[:self.cx] + char + t[self.cx:]
 572             self.SetTextLine(self.cy, t)
 573             self.cHoriz(1)
 574             self.TouchBuffer()
 575
 576     def JoinLines(self):
 577         t1 = self.lines[self.cy]
 578         t2 = self.lines[self.cy+1]
 579         self.cx = len(t1)
 580         self.lines = self.lines[:self.cy] + [t1 + t2] + self.lines[self.cy+2:]
 581         self.TouchBuffer()
 582
 583
 584     def DeleteChar(self,x,y,oldtext):
 585         newtext = oldtext[:x] + oldtext[x+1:]
 586         self.SetTextLine(y, newtext)
 587         self.TouchBuffer()
 588
 589
 590     def BackSpace(self, event):
 591         t = self.GetTextLine(self.cy)
 592         if self.cx>0:
 593             self.DeleteChar(self.cx-1,self.cy,t)
 594             self.cHoriz(-1)
 595             self.TouchBuffer()
 596         elif self.cx == 0:
 597             if self.cy > 0:
 598                 self.cy -= 1
 599                 self.JoinLines()
 600                 self.TouchBuffer()
 601             else:
 602                 wx.Bell()
 603
 604     def Delete(self, event):
 605         t = self.GetTextLine(self.cy)
 606         if self.cx<len(t):
 607             self.DeleteChar(self.cx,self.cy,t)
 608             self.TouchBuffer()
 609         else:
 610             if self.cy < len(self.lines) - 1:
 611                 self.JoinLines()
 612                 self.TouchBuffer()
 613
 614     def Escape(self, event):
 615         self.SelectOff()
 616
 617     def TabKey(self, event):
 618         numSpaces = self.SpacesPerTab - (self.cx % self.SpacesPerTab)
 619         self.SingleLineInsert(' ' * numSpaces)
 620
 621 ##----------- selection routines
 622
 623     def SelectUpdate(self):
 624         self.SelectEnd = (self.cy, self.cx)
 625         self.SelectNotify(self.Selecting, self.SelectBegin, self.SelectEnd)
 626         self.UpdateView()
 627
 628     def NormalizedSelect(self):
 629         (begin, end) = (self.SelectBegin, self.SelectEnd)
 630         (bRow, bCol) = begin
 631         (eRow, eCol) = end
 632         if (bRow < eRow):
 633             return (begin, end)
 634         elif (eRow < bRow):
 635             return (end, begin)
 636         else:
 637             if (bCol < eCol):
 638                 return (begin, end)
 639             else:
 640                 return (end, begin)
 641
 642     def FindSelection(self):
 643         if self.SelectEnd is None or self.SelectBegin is None:
 644             wx.Bell()
 645             return None
 646         (begin, end) =  self.NormalizedSelect()
 647         (bRow, bCol) = begin
 648         (eRow, eCol) = end
 649         return (bRow, bCol, eRow, eCol)
 650
 651     def SelectOff(self):
 652         self.SelectBegin = None
 653         self.SelectEnd = None
 654         self.Selecting = False
 655         self.SelectNotify(False,None,None)
 656
 657     def CopySelection(self, event):
 658         selection = self.FindSelection()
 659         if selection is None:
 660             return
 661         (bRow, bCol, eRow, eCol) = selection
 662
 663         if bRow == eRow:
 664             self.SingleLineCopy(bRow, bCol, eCol)
 665         else:
 666             self.MultipleLineCopy(bRow, bCol, eRow, eCol)
 667
 668     def OnCopySelection(self, event):
 669         self.CopySelection(event)
 670         self.SelectOff()
 671
 672     def CopyToClipboard(self, linesOfText):
 673         do = wx.TextDataObject()
 674         do.SetText(os.linesep.join(linesOfText))
 675         wx.TheClipboard.Open()
 676         wx.TheClipboard.SetData(do)
 677         wx.TheClipboard.Close()
 678
 679     def SingleLineCopy(self, Row, bCol, eCol):
 680         Line = self.GetTextLine(Row)
 681         self.CopyToClipboard([Line[bCol:eCol]])
 682
 683     def MultipleLineCopy(self, bRow, bCol, eRow, eCol):
 684         bLine = self.GetTextLine(bRow)[bCol:]
 685         eLine = self.GetTextLine(eRow)[:eCol]
 686         self.CopyToClipboard([bLine] + [l for l in self.lines[bRow + 1:eRow]] + [eLine])
 687
 688     def OnDeleteSelection(self, event):
 689         selection = self.FindSelection()
 690         if selection is None:
 691             return
 692         (bRow, bCol, eRow, eCol) = selection
 693
 694         if bRow == eRow:
 695             self.SingleLineDelete(bRow, bCol, eCol)
 696         else:
 697             self.MultipleLineDelete(bRow, bCol, eRow, eCol)
 698
 699         self.TouchBuffer()
 700
 701         self.cy = bRow
 702         self.cx = bCol
 703         self.SelectOff()
 704         self.UpdateView()
 705
 706
 707     def SingleLineDelete(self, Row, bCol, eCol):
 708         ModLine = self.GetTextLine(Row)
 709         ModLine = ModLine[:bCol] + ModLine[eCol:]
 710         self.SetTextLine(Row,ModLine)
 711
 712     def MultipleLineDelete(self, bRow, bCol, eRow, eCol):
 713         bLine = self.GetTextLine(bRow)
 714         eLine = self.GetTextLine(eRow)
 715         ModLine = bLine[:bCol] + eLine[eCol:]
 716         self.lines[bRow:eRow + 1] = [ModLine]
 717
 718     def OnPaste(self, event):
 719         do = wx.TextDataObject()
 720         wx.TheClipboard.Open()
 721         success = wx.TheClipboard.GetData(do)
 722         wx.TheClipboard.Close()
 723         if success:
 724             pastedLines = LineSplitter(do.GetText())
 725         else:
 726             wx.Bell()
 727             return
 728         if len(pastedLines) == 0:
 729             wx.Bell()
 730             return
 731         elif len(pastedLines) == 1:
 732             self.SingleLineInsert(pastedLines[0])
 733         else:
 734             self.MultipleLinePaste(pastedLines)
 735
 736     def SingleLineInsert(self, newText):
 737         ModLine = self.GetTextLine(self.cy)
 738         ModLine = ModLine[:self.cx] + newText + ModLine[self.cx:]
 739         self.SetTextLine(self.cy, ModLine)
 740         self.cHoriz(len(newText))
 741         self.TouchBuffer()
 742         self.UpdateView()
 743
 744     def MultipleLinePaste(self, pastedLines):
 745         FirstLine = LastLine = self.GetTextLine(self.cy)
 746         FirstLine = FirstLine[:self.cx] + pastedLines[0]
 747         LastLine = pastedLines[-1] + LastLine[self.cx:]
 748
 749         NewSlice = [FirstLine]
 750         NewSlice += [l for l in pastedLines[1:-1]]
 751         NewSlice += [LastLine]
 752         self.lines[self.cy:self.cy + 1] = NewSlice
 753
 754         self.cy = self.cy + len(pastedLines)-1
 755         self.cx = len(pastedLines[-1])
 756         self.TouchBuffer()
 757         self.UpdateView()
 758
 759     def OnCutSelection(self,event):
 760         self.CopySelection(event)
 761         self.OnDeleteSelection(event)
 762
 763 #-------------- Keyboard movement implementations
 764
 765     def MoveDown(self, event):
 766         self.cVert(+1)
 767
 768     def MoveUp(self, event):
 769         self.cVert(-1)
 770
 771     def MoveLeft(self, event):
 772         if self.cx == 0:
 773             if self.cy == 0:
 774                 wx.Bell()
 775             else:
 776                 self.cVert(-1)
 777                 self.cx = self.CurrentLineLength()
 778         else:
 779             self.cx -= 1
 780
 781     def MoveRight(self, event):
 782         linelen = self.CurrentLineLength()
 783         if self.cx == linelen:
 784             if self.cy == len(self.lines) - 1:
 785                 wx.Bell()
 786             else:
 787                 self.cx = 0
 788                 self.cVert(1)
 789         else:
 790             self.cx += 1
 791
 792
 793     def MovePageDown(self, event):
 794         self.cVert(self.sh)
 795
 796     def MovePageUp(self, event):
 797         self.cVert(-self.sh)
 798
 799     def MoveHome(self, event):
 800         self.cx = 0
 801
 802     def MoveEnd(self, event):
 803         self.cx = self.CurrentLineLength()
 804
 805     def MoveStartOfFile(self, event):
 806         self.cy = 0
 807         self.cx = 0
 808
 809     def MoveEndOfFile(self, event):
 810         self.cy = len(self.lines) - 1
 811         self.cx = self.CurrentLineLength()
 812
 813 #-------------- Key handler mapping tables
 814
 815     def SetMoveSpecialFuncs(self, action):
 816         action[wx.WXK_DOWN]  = self.MoveDown
 817         action[wx.WXK_UP]    = self.MoveUp
 818         action[wx.WXK_LEFT]  = self.MoveLeft
 819         action[wx.WXK_RIGHT] = self.MoveRight
 820         action[wx.WXK_NEXT]  = self.MovePageDown
 821         action[wx.WXK_PRIOR] = self.MovePageUp
 822         action[wx.WXK_HOME]  = self.MoveHome
 823         action[wx.WXK_END]   = self.MoveEnd
 824
 825     def SetMoveSpecialControlFuncs(self, action):
 826         action[wx.WXK_HOME] = self.MoveStartOfFile
 827         action[wx.WXK_END]  = self.MoveEndOfFile
 828
 829     def SetAltFuncs(self, action):
 830         # subclass implements
 831         pass
 832
 833     def SetControlFuncs(self, action):
 834         action['c'] = self.OnCopySelection
 835         action['d'] = self.OnDeleteSelection
 836         action['v'] = self.OnPaste
 837         action['x'] = self.OnCutSelection
 838
 839     def SetSpecialControlFuncs(self, action):
 840         action[wx.WXK_INSERT] = self.OnCopySelection
 841
 842     def SetShiftFuncs(self, action):
 843         action[wx.WXK_DELETE] = self.OnCutSelection
 844         action[wx.WXK_INSERT] = self.OnPaste
 845
 846     def SetSpecialFuncs(self, action):
 847         action[wx.WXK_BACK]   = self.BackSpace
 848         action[wx.WXK_DELETE] = self.Delete
 849         action[wx.WXK_RETURN] = self.BreakLine
 850         action[wx.WXK_ESCAPE] = self.Escape
 851         action[wx.WXK_TAB]    = self.TabKey
 852
 853 ##-------------- Logic for key handlers
 854
 855
 856     def Move(self, keySettingFunction, key, event):
 857         action = {}
 858         keySettingFunction(action)
 859
 860         if not action.has_key(key):
 861             return False
 862
 863         if event.ShiftDown():
 864             if not self.Selecting:
 865                 self.Selecting = True
 866                 self.SelectBegin = (self.cy, self.cx)
 867             action[key](event)
 868             self.SelectEnd = (self.cy, self.cx)
 869         else:
 870             action[key](event)
 871             if self.Selecting:
 872                 self.Selecting = False
 873
 874         self.SelectNotify(self.Selecting, self.SelectBegin, self.SelectEnd)
 875         self.UpdateView()
 876         return True
 877
 878     def MoveSpecialKey(self, event, key):
 879         return self.Move(self.SetMoveSpecialFuncs, key, event)
 880
 881     def MoveSpecialControlKey(self, event, key):
 882         if not event.ControlDown():
 883             return False
 884         return self.Move(self.SetMoveSpecialControlFuncs, key, event)
 885
 886     def Dispatch(self, keySettingFunction, key, event):
 887         action = {}
 888         keySettingFunction(action)
 889         if action.has_key(key):
 890             action[key](event)
 891             self.UpdateView()
 892             return True
 893         return False
 894
 895     def ModifierKey(self, key, event, modifierKeyDown, MappingFunc):
 896         if not modifierKeyDown:
 897             return False
 898
 899         key = self.UnixKeyHack(key)
 900         try:
 901             key = chr(key)
 902         except:
 903             return False
 904         if not self.Dispatch(MappingFunc, key, event):
 905             wx.Bell()
 906         return True
 907
 908     def ControlKey(self, event, key):
 909         return self.ModifierKey(key, event, event.ControlDown(), self.SetControlFuncs)
 910
 911     def AltKey(self, event, key):
 912         return self.ModifierKey(key, event, event.AltDown(), self.SetAltFuncs)
 913
 914     def SpecialControlKey(self, event, key):
 915         if not event.ControlDown():
 916             return False
 917         if not self.Dispatch(self.SetSpecialControlFuncs, key, event):
 918             wx.Bell()
 919         return True
 920
 921     def ShiftKey(self, event, key):
 922         if not event.ShiftDown():
 923             return False
 924         return self.Dispatch(self.SetShiftFuncs, key, event)
 925
 926     def NormalChar(self, event, key):
 927         self.SelectOff()
 928
 929         # regular ascii
 930         if not self.Dispatch(self.SetSpecialFuncs, key, event):
 931             if (key>31) and (key<256):
 932                 self.InsertChar(chr(key))
 933             else:
 934                 wx.Bell()
 935                 return
 936         self.UpdateView()
 937         self.AdjustScrollbars()
 938
 939     def OnChar(self, event):
 940         key = event.KeyCode()
 941         filters = [self.AltKey,
 942                    self.MoveSpecialControlKey,
 943                    self.ControlKey,
 944                    self.SpecialControlKey,
 945                    self.MoveSpecialKey,
 946                    self.ShiftKey,
 947                    self.NormalChar]
 948         for filter in filters:
 949             if filter(event,key):
 950                 break
 951         return 0
 952
 953 #----------------------- Eliminate memory leaks
 954
 955     def OnDestroy(self, event):
 956         self.mdc = None
 957         self.odc = None
 958         self.bgColor = None
 959         self.fgColor = None
 960         self.font = None
 961         self.selectColor = None
 962         self.scrollTimer = None
 963         self.eofMarker = None
 964
 965 #--------------------  Abstract methods for subclasses
 966
 967     def OnClick(self):
 968         pass
 969
 970     def SelectNotify(self, Selecting, SelectionBegin, SelectionEnd):
 971         pass
 972