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             font = wx.Font(10, wx.MODERN, wx.NORMAL, wx.NORMAL)
 135         else:
 136             font = wx.Font(12, wx.MODERN, wx.NORMAL, wx.NORMAL, False)
 137         if wx.Platform == "__WXMAC__":
 138             font.SetNoAntiAliasing()
 139         return font
 140
 141     def UnixKeyHack(self, key):
 142         #
 143         # this will be obsolete when we get the new wxWindows patch
 144         #
 145         # 12/14/03 - jmg
 146         #
 147         # Which patch? I don't know if this is needed, but I don't know
 148         # why it's here either. Play it safe; leave it in.
 149         #
 150         if key <= 26:
 151             key += ord('a') - 1
 152         return key
 153
 154 ##-------------------- UpdateView/Cursor code
 155
 156     def OnSize(self, event):
 157         self.AdjustScrollbars()
 158         self.SetFocus()
 159
 160     def SetCharDimensions(self):
 161         # TODO: We need a code review on this.  It appears that Linux
 162         # improperly reports window dimensions when the scrollbar's there.
 163         self.bw, self.bh = self.GetClientSize()
 164
 165         if wx.Platform == "__WXMSW__":
 166             self.sh = self.bh / self.fh
 167             self.sw = (self.bw / self.fw) - 1
 168         else:
 169             self.sh = self.bh / self.fh
 170             if self.LinesInFile() >= self.sh:
 171                 self.bw = self.bw - wx.SystemSettings_GetMetric(wx.SYS_VSCROLL_X)
 172                 self.sw = (self.bw / self.fw) - 1
 173
 174             self.sw = (self.bw / self.fw) - 1
 175             if self.CalcMaxLineLen() >= self.sw:
 176                 self.bh = self.bh - wx.SystemSettings_GetMetric(wx.SYS_HSCROLL_Y)
 177                 self.sh = self.bh / self.fh
 178
 179
 180     def UpdateView(self, dc = None):
 181         if dc is None:
 182             dc = wx.ClientDC(self)
 183         if dc.Ok():
 184             self.SetCharDimensions()
 185             self.KeepCursorOnScreen()
 186             self.DrawSimpleCursor(0,0, dc, True)
 187             self.Draw(dc)
 188
 189     def OnPaint(self, event):
 190         dc = wx.PaintDC(self)
 191         if self.isDrawing:
 192             return
 193         self.isDrawing = True
 194         self.UpdateView(dc)
 195         wx.CallAfter(self.AdjustScrollbars)
 196         self.isDrawing = False
 197
 198     def OnEraseBackground(self, evt):
 199         pass
 200
 201 ##-------------------- Drawing code
 202
 203     def InitFonts(self):
 204         dc = wx.ClientDC(self)
 205         self.font = self.NiceFontForPlatform()
 206         dc.SetFont(self.font)
 207         self.fw = dc.GetCharWidth()
 208         self.fh = dc.GetCharHeight()
 209
 210     def SetColors(self):
 211         self.fgColor = wx.NamedColour('black')
 212         self.bgColor = wx.NamedColour('white')
 213         self.selectColor = wx.Colour(238, 220, 120)  # r, g, b = emacsOrange
 214
 215     def InitDoubleBuffering(self):
 216         pass
 217
 218     def DrawEditText(self, t, x, y, dc):
 219         dc.DrawText(t, x * self.fw, y * self.fh)
 220
 221     def DrawLine(self, line, dc):
 222         if self.IsLine(line):
 223             l   = line
 224             t   = self.lines[l]
 225             dc.SetTextForeground(self.fgColor)
 226             fragments = selection.Selection(
 227                 self.SelectBegin, self.SelectEnd,
 228                 self.sx, self.sw, line, t)
 229             x = 0
 230             for (data, selected) in fragments:
 231                 if selected:
 232                     dc.SetTextBackground(self.selectColor)
 233                     if x == 0 and len(data) == 0 and len(fragments) == 1:
 234                         data = ' '
 235                 else:
 236                     dc.SetTextBackground(self.bgColor)
 237                 self.DrawEditText(data, x, line - self.sy, dc)
 238                 x += len(data)
 239
 240     def Draw(self, odc=None):
 241         if not odc:
 242             odc = wx.ClientDC(self)
 243
 244         bmp = wx.EmptyBitmap(max(1,self.bw), max(1,self.bh))
 245         dc = wx.BufferedDC(odc, bmp)
 246         if dc.Ok():
 247             dc.SetFont(self.font)
 248             dc.SetBackgroundMode(wx.SOLID)
 249             dc.SetTextBackground(self.bgColor)
 250             dc.SetTextForeground(self.fgColor)
 251             dc.Clear()
 252             for line in range(self.sy, self.sy + self.sh):
 253                 self.DrawLine(line, dc)
 254             if len(self.lines) < self.sh + self.sy:
 255                 self.DrawEofMarker(dc)
 256             self.DrawCursor(dc)
 257
 258 ##------------------ eofMarker stuff
 259
 260     def LoadImages(self):
 261         self.eofMarker = images.GetBitmap(images.EofImageData)
 262
 263     def DrawEofMarker(self,dc):
 264         x = 0
 265         y = (len(self.lines) - self.sy) * self.fh
 266         hasTransparency = 1
 267         dc.DrawBitmap(self.eofMarker, x, y, hasTransparency)
 268
 269 ##------------------ cursor-related functions
 270
 271     def DrawCursor(self, dc = None):
 272         if not dc:
 273             dc = wx.ClientDC(self)
 274
 275         if (self.LinesInFile())<self.cy: #-1 ?
 276             self.cy = self.LinesInFile()-1
 277         s = self.lines[self.cy]
 278
 279         x = self.cx - self.sx
 280         y = self.cy - self.sy
 281         self.DrawSimpleCursor(x, y, dc)
 282
 283
 284     def DrawSimpleCursor(self, xp, yp, dc = None, old=False):
 285         if not dc:
 286             dc = wx.ClientDC(self)
 287
 288         if old:
 289             xp = self.sco_x
 290             yp = self.sco_y
 291
 292         szx = self.fw
 293         szy = self.fh
 294         x = xp * szx
 295         y = yp * szy
 296         dc.Blit(x,y, szx,szy, dc, x,y, wx.SRC_INVERT)
 297         self.sco_x = xp
 298         self.sco_y = yp
 299
 300 ##-------- Enforcing screen boundaries, cursor movement
 301
 302     def CalcMaxLineLen(self):
 303         """get length of longest line on screen"""
 304         maxlen = 0
 305         for line in self.lines[self.sy:self.sy+self.sh]:
 306             if len(line) >maxlen:
 307                 maxlen = len(line)
 308         return maxlen
 309
 310     def KeepCursorOnScreen(self):
 311         self.sy = ForceBetween(max(0, self.cy-self.sh), self.sy, self.cy)
 312         self.sx = ForceBetween(max(0, self.cx-self.sw), self.sx, self.cx)
 313         self.AdjustScrollbars()
 314
 315     def HorizBoundaries(self):
 316         self.SetCharDimensions()
 317         maxLineLen = self.CalcMaxLineLen()
 318         self.sx = ForceBetween(0, self.sx, max(self.sw, maxLineLen - self.sw + 1))
 319         self.cx = ForceBetween(self.sx, self.cx, self.sx + self.sw - 1)
 320
 321     def VertBoundaries(self):
 322         self.SetCharDimensions()
 323         self.sy = ForceBetween(0, self.sy, max(self.sh, self.LinesInFile() - self.sh + 1))
 324         self.cy = ForceBetween(self.sy, self.cy, self.sy + self.sh - 1)
 325
 326     def cVert(self, num):
 327         self.cy = self.cy + num
 328         self.cy = ForceBetween(0, self.cy, self.LinesInFile() - 1)
 329         self.sy = ForceBetween(self.cy - self.sh + 1, self.sy, self.cy)
 330         self.cx = min(self.cx, self.CurrentLineLength())
 331
 332     def cHoriz(self, num):
 333         self.cx = self.cx + num
 334         self.cx = ForceBetween(0, self.cx, self.CurrentLineLength())
 335         self.sx = ForceBetween(self.cx - self.sw + 1, self.sx, self.cx)
 336
 337     def AboveScreen(self, row):
 338         return row < self.sy
 339
 340     def BelowScreen(self, row):
 341         return row >= self.sy + self.sh
 342
 343     def LeftOfScreen(self, col):
 344         return col < self.sx
 345
 346     def RightOfScreen(self, col):
 347         return col >= self.sx + self.sw
 348
 349 ##----------------- data structure helper functions
 350
 351     def GetText(self):
 352         return self.lines
 353
 354     def SetText(self, lines):
 355         self.InitCoords()
 356         self.lines = lines
 357         self.UnTouchBuffer()
 358         self.SelectOff()
 359         self.AdjustScrollbars()
 360         self.UpdateView(None)
 361
 362     def IsLine(self, lineNum):
 363         return (0<=lineNum) and (lineNum<self.LinesInFile())
 364
 365     def GetTextLine(self, lineNum):
 366         if self.IsLine(lineNum):
 367             return self.lines[lineNum]
 368         return ""
 369
 370     def SetTextLine(self, lineNum, text):
 371         if self.IsLine(lineNum):
 372             self.lines[lineNum] = text
 373
 374     def CurrentLineLength(self):
 375         return len(self.lines[self.cy])
 376
 377     def LinesInFile(self):
 378         return len(self.lines)
 379
 380     def UnTouchBuffer(self):
 381         self.bufferTouched = False
 382
 383     def BufferWasTouched(self):
 384         return self.bufferTouched
 385
 386     def TouchBuffer(self):
 387         self.bufferTouched = True
 388
 389
 390 ##-------------------------- Mouse scroll timing functions
 391
 392     def InitScrolling(self):
 393         # we don't rely on the windows system to scroll for us; we just
 394         # redraw the screen manually every time
 395         self.EnableScrolling(False, False)
 396         self.nextScrollTime = 0
 397         self.SCROLLDELAY = 0.050 # seconds
 398         self.scrollTimer = wx.Timer(self)
 399         self.scroller = Scroller(self)
 400
 401     def CanScroll(self):
 402        if time.time() >  self.nextScrollTime:
 403            self.nextScrollTime = time.time() + self.SCROLLDELAY
 404            return True
 405        else:
 406            return False
 407
 408     def SetScrollTimer(self):
 409         oneShot = True
 410         self.scrollTimer.Start(1000*self.SCROLLDELAY/2, oneShot)
 411         self.Bind(wx.EVT_TIMER, self.OnTimer)
 412
 413     def OnTimer(self, event):
 414         screenX, screenY = wx.GetMousePosition()
 415         x, y = self.ScreenToClientXY(screenX, screenY)
 416         self.MouseToRow(y)
 417         self.MouseToCol(x)
 418         self.SelectUpdate()
 419
 420 ##-------------------------- Mouse off screen functions
 421
 422     def HandleAboveScreen(self, row):
 423         self.SetScrollTimer()
 424         if self.CanScroll():
 425             row = self.sy - 1
 426             row = max(0, row)
 427             self.cy = row
 428
 429     def HandleBelowScreen(self, row):
 430         self.SetScrollTimer()
 431         if self.CanScroll():
 432             row = self.sy + self.sh
 433             row  = min(row, self.LinesInFile() - 1)
 434             self.cy = row
 435
 436     def HandleLeftOfScreen(self, col):
 437         self.SetScrollTimer()
 438         if self.CanScroll():
 439             col = self.sx - 1
 440             col = max(0,col)
 441             self.cx = col
 442
 443     def HandleRightOfScreen(self, col):
 444         self.SetScrollTimer()
 445         if self.CanScroll():
 446             col = self.sx + self.sw
 447             col = min(col, self.CurrentLineLength())
 448             self.cx = col
 449
 450 ##------------------------ mousing functions
 451
 452     def MouseToRow(self, mouseY):
 453         row  = self.sy + (mouseY/ self.fh)
 454         if self.AboveScreen(row):
 455             self.HandleAboveScreen(row)
 456         elif self.BelowScreen(row):
 457             self.HandleBelowScreen(row)
 458         else:
 459             self.cy  = min(row, self.LinesInFile() - 1)
 460
 461     def MouseToCol(self, mouseX):
 462         col = self.sx + (mouseX / self.fw)
 463         if self.LeftOfScreen(col):
 464             self.HandleLeftOfScreen(col)
 465         elif self.RightOfScreen(col):
 466             self.HandleRightOfScreen(col)
 467         else:
 468             self.cx = min(col, self.CurrentLineLength())
 469
 470     def MouseToCursor(self, event):
 471         self.MouseToRow(event.GetY())
 472         self.MouseToCol(event.GetX())
 473
 474     def OnMotion(self, event):
 475         if event.LeftIsDown() and self.HasCapture():
 476             self.Selecting = True
 477             self.MouseToCursor(event)
 478             self.SelectUpdate()
 479
 480     def OnLeftDown(self, event):
 481         self.MouseToCursor(event)
 482         self.SelectBegin = (self.cy, self.cx)
 483         self.SelectEnd = None
 484         self.UpdateView()
 485         self.CaptureMouse()
 486
 487     def OnLeftUp(self, event):
 488         if not self.HasCapture():
 489             return
 490
 491         if self.SelectEnd is None:
 492             self.OnClick()
 493         else:
 494             self.Selecting = False
 495             self.SelectNotify(False, self.SelectBegin, self.SelectEnd)
 496
 497         self.ReleaseMouse()
 498         self.scrollTimer.Stop()
 499
 500
 501 #------------------------- Scrolling
 502
 503     def HorizScroll(self, event, eventType):
 504         maxLineLen = self.CalcMaxLineLen()
 505
 506         if eventType == wx.EVT_SCROLLWIN_LINEUP:
 507             self.sx -= 1
 508         elif eventType == wx.EVT_SCROLLWIN_LINEDOWN:
 509             self.sx += 1
 510         elif eventType == wx.EVT_SCROLLWIN_PAGEUP:
 511             self.sx -= self.sw
 512         elif eventType == wx.EVT_SCROLLWIN_PAGEDOWN:
 513             self.sx += self.sw
 514         elif eventType == wx.EVT_SCROLLWIN_TOP:
 515             self.sx = self.cx = 0
 516         elif eventType == wx.EVT_SCROLLWIN_BOTTOM:
 517             self.sx = maxLineLen - self.sw
 518             self.cx = maxLineLen
 519         else:
 520             self.sx = event.GetPosition()
 521
 522         self.HorizBoundaries()
 523
 524     def VertScroll(self, event, eventType):
 525         if   eventType == wx.EVT_SCROLLWIN_LINEUP:
 526             self.sy -= 1
 527         elif eventType == wx.EVT_SCROLLWIN_LINEDOWN:
 528             self.sy += 1
 529         elif eventType == wx.EVT_SCROLLWIN_PAGEUP:
 530             self.sy -= self.sh
 531         elif eventType == wx.EVT_SCROLLWIN_PAGEDOWN:
 532             self.sy += self.sh
 533         elif eventType == wx.EVT_SCROLLWIN_TOP:
 534             self.sy = self.cy = 0
 535         elif eventType == wx.EVT_SCROLLWIN_BOTTOM:
 536             self.sy = self.LinesInFile() - self.sh
 537             self.cy = self.LinesInFile()
 538         else:
 539             self.sy = event.GetPosition()
 540
 541         self.VertBoundaries()
 542
 543     def OnScroll(self, event):
 544         dir = event.GetOrientation()
 545         eventType = event.GetEventType()
 546         if dir == wx.HORIZONTAL:
 547             self.HorizScroll(event, eventType)
 548         else:
 549             self.VertScroll(event, eventType)
 550         self.UpdateView()
 551
 552
 553     def AdjustScrollbars(self):
 554         for i in range(2):
 555             self.SetCharDimensions()
 556             self.scroller.SetScrollbars(
 557                 self.fw, self.fh,
 558                 self.CalcMaxLineLen()+3, max(self.LinesInFile()+1, self.sh),
 559                 self.sx, self.sy)
 560
 561 #------------ backspace, delete, return
 562
 563     def BreakLine(self, event):
 564         if self.IsLine(self.cy):
 565             t = self.lines[self.cy]
 566             self.lines = self.lines[:self.cy] + [t[:self.cx],t[self.cx:]] + self.lines[self.cy+1:]
 567             self.cVert(1)
 568             self.cx = 0
 569             self.TouchBuffer()
 570
 571     def InsertChar(self,char):
 572         if self.IsLine(self.cy):
 573             t = self.lines[self.cy]
 574             t = t[:self.cx] + char + t[self.cx:]
 575             self.SetTextLine(self.cy, t)
 576             self.cHoriz(1)
 577             self.TouchBuffer()
 578
 579     def JoinLines(self):
 580         t1 = self.lines[self.cy]
 581         t2 = self.lines[self.cy+1]
 582         self.cx = len(t1)
 583         self.lines = self.lines[:self.cy] + [t1 + t2] + self.lines[self.cy+2:]
 584         self.TouchBuffer()
 585
 586
 587     def DeleteChar(self,x,y,oldtext):
 588         newtext = oldtext[:x] + oldtext[x+1:]
 589         self.SetTextLine(y, newtext)
 590         self.TouchBuffer()
 591
 592
 593     def BackSpace(self, event):
 594         t = self.GetTextLine(self.cy)
 595         if self.cx>0:
 596             self.DeleteChar(self.cx-1,self.cy,t)
 597             self.cHoriz(-1)
 598             self.TouchBuffer()
 599         elif self.cx == 0:
 600             if self.cy > 0:
 601                 self.cy -= 1
 602                 self.JoinLines()
 603                 self.TouchBuffer()
 604             else:
 605                 wx.Bell()
 606
 607     def Delete(self, event):
 608         t = self.GetTextLine(self.cy)
 609         if self.cx<len(t):
 610             self.DeleteChar(self.cx,self.cy,t)
 611             self.TouchBuffer()
 612         else:
 613             if self.cy < len(self.lines) - 1:
 614                 self.JoinLines()
 615                 self.TouchBuffer()
 616
 617     def Escape(self, event):
 618         self.SelectOff()
 619
 620     def TabKey(self, event):
 621         numSpaces = self.SpacesPerTab - (self.cx % self.SpacesPerTab)
 622         self.SingleLineInsert(' ' * numSpaces)
 623
 624 ##----------- selection routines
 625
 626     def SelectUpdate(self):
 627         self.SelectEnd = (self.cy, self.cx)
 628         self.SelectNotify(self.Selecting, self.SelectBegin, self.SelectEnd)
 629         self.UpdateView()
 630
 631     def NormalizedSelect(self):
 632         (begin, end) = (self.SelectBegin, self.SelectEnd)
 633         (bRow, bCol) = begin
 634         (eRow, eCol) = end
 635         if (bRow < eRow):
 636             return (begin, end)
 637         elif (eRow < bRow):
 638             return (end, begin)
 639         else:
 640             if (bCol < eCol):
 641                 return (begin, end)
 642             else:
 643                 return (end, begin)
 644
 645     def FindSelection(self):
 646         if self.SelectEnd is None or self.SelectBegin is None:
 647             wx.Bell()
 648             return None
 649         (begin, end) =  self.NormalizedSelect()
 650         (bRow, bCol) = begin
 651         (eRow, eCol) = end
 652         return (bRow, bCol, eRow, eCol)
 653
 654     def SelectOff(self):
 655         self.SelectBegin = None
 656         self.SelectEnd = None
 657         self.Selecting = False
 658         self.SelectNotify(False,None,None)
 659
 660     def CopySelection(self, event):
 661         selection = self.FindSelection()
 662         if selection is None:
 663             return
 664         (bRow, bCol, eRow, eCol) = selection
 665
 666         if bRow == eRow:
 667             self.SingleLineCopy(bRow, bCol, eCol)
 668         else:
 669             self.MultipleLineCopy(bRow, bCol, eRow, eCol)
 670
 671     def OnCopySelection(self, event):
 672         self.CopySelection(event)
 673         self.SelectOff()
 674
 675     def CopyToClipboard(self, linesOfText):
 676         do = wx.TextDataObject()
 677         do.SetText(os.linesep.join(linesOfText))
 678         wx.TheClipboard.Open()
 679         wx.TheClipboard.SetData(do)
 680         wx.TheClipboard.Close()
 681
 682     def SingleLineCopy(self, Row, bCol, eCol):
 683         Line = self.GetTextLine(Row)
 684         self.CopyToClipboard([Line[bCol:eCol]])
 685
 686     def MultipleLineCopy(self, bRow, bCol, eRow, eCol):
 687         bLine = self.GetTextLine(bRow)[bCol:]
 688         eLine = self.GetTextLine(eRow)[:eCol]
 689         self.CopyToClipboard([bLine] + [l for l in self.lines[bRow + 1:eRow]] + [eLine])
 690
 691     def OnDeleteSelection(self, event):
 692         selection = self.FindSelection()
 693         if selection is None:
 694             return
 695         (bRow, bCol, eRow, eCol) = selection
 696
 697         if bRow == eRow:
 698             self.SingleLineDelete(bRow, bCol, eCol)
 699         else:
 700             self.MultipleLineDelete(bRow, bCol, eRow, eCol)
 701
 702         self.TouchBuffer()
 703
 704         self.cy = bRow
 705         self.cx = bCol
 706         self.SelectOff()
 707         self.UpdateView()
 708
 709
 710     def SingleLineDelete(self, Row, bCol, eCol):
 711         ModLine = self.GetTextLine(Row)
 712         ModLine = ModLine[:bCol] + ModLine[eCol:]
 713         self.SetTextLine(Row,ModLine)
 714
 715     def MultipleLineDelete(self, bRow, bCol, eRow, eCol):
 716         bLine = self.GetTextLine(bRow)
 717         eLine = self.GetTextLine(eRow)
 718         ModLine = bLine[:bCol] + eLine[eCol:]
 719         self.lines[bRow:eRow + 1] = [ModLine]
 720
 721     def OnPaste(self, event):
 722         do = wx.TextDataObject()
 723         wx.TheClipboard.Open()
 724         success = wx.TheClipboard.GetData(do)
 725         wx.TheClipboard.Close()
 726         if success:
 727             pastedLines = LineSplitter(do.GetText())
 728         else:
 729             wx.Bell()
 730             return
 731         if len(pastedLines) == 0:
 732             wx.Bell()
 733             return
 734         elif len(pastedLines) == 1:
 735             self.SingleLineInsert(pastedLines[0])
 736         else:
 737             self.MultipleLinePaste(pastedLines)
 738
 739     def SingleLineInsert(self, newText):
 740         ModLine = self.GetTextLine(self.cy)
 741         ModLine = ModLine[:self.cx] + newText + ModLine[self.cx:]
 742         self.SetTextLine(self.cy, ModLine)
 743         self.cHoriz(len(newText))
 744         self.TouchBuffer()
 745         self.UpdateView()
 746
 747     def MultipleLinePaste(self, pastedLines):
 748         FirstLine = LastLine = self.GetTextLine(self.cy)
 749         FirstLine = FirstLine[:self.cx] + pastedLines[0]
 750         LastLine = pastedLines[-1] + LastLine[self.cx:]
 751
 752         NewSlice = [FirstLine]
 753         NewSlice += [l for l in pastedLines[1:-1]]
 754         NewSlice += [LastLine]
 755         self.lines[self.cy:self.cy + 1] = NewSlice
 756
 757         self.cy = self.cy + len(pastedLines)-1
 758         self.cx = len(pastedLines[-1])
 759         self.TouchBuffer()
 760         self.UpdateView()
 761
 762     def OnCutSelection(self,event):
 763         self.CopySelection(event)
 764         self.OnDeleteSelection(event)
 765
 766 #-------------- Keyboard movement implementations
 767
 768     def MoveDown(self, event):
 769         self.cVert(+1)
 770
 771     def MoveUp(self, event):
 772         self.cVert(-1)
 773
 774     def MoveLeft(self, event):
 775         if self.cx == 0:
 776             if self.cy == 0:
 777                 wx.Bell()
 778             else:
 779                 self.cVert(-1)
 780                 self.cx = self.CurrentLineLength()
 781         else:
 782             self.cx -= 1
 783
 784     def MoveRight(self, event):
 785         linelen = self.CurrentLineLength()
 786         if self.cx == linelen:
 787             if self.cy == len(self.lines) - 1:
 788                 wx.Bell()
 789             else:
 790                 self.cx = 0
 791                 self.cVert(1)
 792         else:
 793             self.cx += 1
 794
 795
 796     def MovePageDown(self, event):
 797         self.cVert(self.sh)
 798
 799     def MovePageUp(self, event):
 800         self.cVert(-self.sh)
 801
 802     def MoveHome(self, event):
 803         self.cx = 0
 804
 805     def MoveEnd(self, event):
 806         self.cx = self.CurrentLineLength()
 807
 808     def MoveStartOfFile(self, event):
 809         self.cy = 0
 810         self.cx = 0
 811
 812     def MoveEndOfFile(self, event):
 813         self.cy = len(self.lines) - 1
 814         self.cx = self.CurrentLineLength()
 815
 816 #-------------- Key handler mapping tables
 817
 818     def SetMoveSpecialFuncs(self, action):
 819         action[wx.WXK_DOWN]  = self.MoveDown
 820         action[wx.WXK_UP]    = self.MoveUp
 821         action[wx.WXK_LEFT]  = self.MoveLeft
 822         action[wx.WXK_RIGHT] = self.MoveRight
 823         action[wx.WXK_NEXT]  = self.MovePageDown
 824         action[wx.WXK_PRIOR] = self.MovePageUp
 825         action[wx.WXK_HOME]  = self.MoveHome
 826         action[wx.WXK_END]   = self.MoveEnd
 827
 828     def SetMoveSpecialControlFuncs(self, action):
 829         action[wx.WXK_HOME] = self.MoveStartOfFile
 830         action[wx.WXK_END]  = self.MoveEndOfFile
 831
 832     def SetAltFuncs(self, action):
 833         # subclass implements
 834         pass
 835
 836     def SetControlFuncs(self, action):
 837         action['c'] = self.OnCopySelection
 838         action['d'] = self.OnDeleteSelection
 839         action['v'] = self.OnPaste
 840         action['x'] = self.OnCutSelection
 841
 842     def SetSpecialControlFuncs(self, action):
 843         action[wx.WXK_INSERT] = self.OnCopySelection
 844
 845     def SetShiftFuncs(self, action):
 846         action[wx.WXK_DELETE] = self.OnCutSelection
 847         action[wx.WXK_INSERT] = self.OnPaste
 848
 849     def SetSpecialFuncs(self, action):
 850         action[wx.WXK_BACK]   = self.BackSpace
 851         action[wx.WXK_DELETE] = self.Delete
 852         action[wx.WXK_RETURN] = self.BreakLine
 853         action[wx.WXK_ESCAPE] = self.Escape
 854         action[wx.WXK_TAB]    = self.TabKey
 855
 856 ##-------------- Logic for key handlers
 857
 858
 859     def Move(self, keySettingFunction, key, event):
 860         action = {}
 861         keySettingFunction(action)
 862
 863         if not action.has_key(key):
 864             return False
 865
 866         if event.ShiftDown():
 867             if not self.Selecting:
 868                 self.Selecting = True
 869                 self.SelectBegin = (self.cy, self.cx)
 870             action[key](event)
 871             self.SelectEnd = (self.cy, self.cx)
 872         else:
 873             action[key](event)
 874             if self.Selecting:
 875                 self.Selecting = False
 876
 877         self.SelectNotify(self.Selecting, self.SelectBegin, self.SelectEnd)
 878         self.UpdateView()
 879         return True
 880
 881     def MoveSpecialKey(self, event, key):
 882         return self.Move(self.SetMoveSpecialFuncs, key, event)
 883
 884     def MoveSpecialControlKey(self, event, key):
 885         if not event.ControlDown():
 886             return False
 887         return self.Move(self.SetMoveSpecialControlFuncs, key, event)
 888
 889     def Dispatch(self, keySettingFunction, key, event):
 890         action = {}
 891         keySettingFunction(action)
 892         if action.has_key(key):
 893             action[key](event)
 894             self.UpdateView()
 895             return True
 896         return False
 897
 898     def ModifierKey(self, key, event, modifierKeyDown, MappingFunc):
 899         if not modifierKeyDown:
 900             return False
 901
 902         key = self.UnixKeyHack(key)
 903         try:
 904             key = chr(key)
 905         except:
 906             return False
 907         if not self.Dispatch(MappingFunc, key, event):
 908             wx.Bell()
 909         return True
 910
 911     def ControlKey(self, event, key):
 912         return self.ModifierKey(key, event, event.ControlDown(), self.SetControlFuncs)
 913
 914     def AltKey(self, event, key):
 915         return self.ModifierKey(key, event, event.AltDown(), self.SetAltFuncs)
 916
 917     def SpecialControlKey(self, event, key):
 918         if not event.ControlDown():
 919             return False
 920         if not self.Dispatch(self.SetSpecialControlFuncs, key, event):
 921             wx.Bell()
 922         return True
 923
 924     def ShiftKey(self, event, key):
 925         if not event.ShiftDown():
 926             return False
 927         return self.Dispatch(self.SetShiftFuncs, key, event)
 928
 929     def NormalChar(self, event, key):
 930         self.SelectOff()
 931
 932         # regular ascii
 933         if not self.Dispatch(self.SetSpecialFuncs, key, event):
 934             if (key>31) and (key<256):
 935                 self.InsertChar(chr(key))
 936             else:
 937                 wx.Bell()
 938                 return
 939         self.UpdateView()
 940         self.AdjustScrollbars()
 941
 942     def OnChar(self, event):
 943         key = event.KeyCode()
 944         filters = [self.AltKey,
 945                    self.MoveSpecialControlKey,
 946                    self.ControlKey,
 947                    self.SpecialControlKey,
 948                    self.MoveSpecialKey,
 949                    self.ShiftKey,
 950                    self.NormalChar]
 951         for filter in filters:
 952             if filter(event,key):
 953                 break
 954         return 0
 955
 956 #----------------------- Eliminate memory leaks
 957
 958     def OnDestroy(self, event):
 959         self.mdc = None
 960         self.odc = None
 961         self.bgColor = None
 962         self.fgColor = None
 963         self.font = None
 964         self.selectColor = None
 965         self.scrollTimer = None
 966         self.eofMarker = None
 967
 968 #--------------------  Abstract methods for subclasses
 969
 970     def OnClick(self):
 971         pass
 972
 973     def SelectNotify(self, Selecting, SelectionBegin, SelectionEnd):
 974         pass
 975