wxPython/wx/lib/editor/editor.py

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