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