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         dc = wx.BufferedDC(odc)
 245         if dc.IsOk():
 246             dc.SetFont(self.font)
 247             dc.SetBackgroundMode(wx.SOLID)
 248             dc.SetTextBackground(self.bgColor)
 249             dc.SetTextForeground(self.fgColor)
 250             dc.Clear()
 251             for line in range(self.sy, self.sy + self.sh):
 252                 self.DrawLine(line, dc)
 253             if len(self.lines) < self.sh + self.sy:
 254                 self.DrawEofMarker(dc)
 255             self.DrawCursor(dc)
 256
 257 ##------------------ eofMarker stuff
 258
 259     def LoadImages(self):
 260         self.eofMarker = images.GetBitmap(images.EofImageData)
 261
 262     def DrawEofMarker(self,dc):
 263         x = 0
 264         y = (len(self.lines) - self.sy) * self.fh
 265         hasTransparency = 1
 266         dc.DrawBitmap(self.eofMarker, x, y, hasTransparency)
 267
 268 ##------------------ cursor-related functions
 269
 270     def DrawCursor(self, dc = None):
 271         if not dc:
 272             dc = wx.ClientDC(self)
 273
 274         if (self.LinesInFile())<self.cy: #-1 ?
 275             self.cy = self.LinesInFile()-1
 276         s = self.lines[self.cy]
 277
 278         x = self.cx - self.sx
 279         y = self.cy - self.sy
 280         self.DrawSimpleCursor(x, y, dc)
 281
 282
 283     def DrawSimpleCursor(self, xp, yp, dc = None, old=False):
 284         if not dc:
 285             dc = wx.ClientDC(self)
 286
 287         if old:
 288             xp = self.sco_x
 289             yp = self.sco_y
 290
 291         szx = self.fw
 292         szy = self.fh
 293         x = xp * szx
 294         y = yp * szy
 295         dc.Blit(x,y, szx,szy, dc, x,y, wx.SRC_INVERT)
 296         self.sco_x = xp
 297         self.sco_y = yp
 298
 299 ##-------- Enforcing screen boundaries, cursor movement
 300
 301     def CalcMaxLineLen(self):
 302         """get length of longest line on screen"""
 303         maxlen = 0
 304         for line in self.lines[self.sy:self.sy+self.sh]:
 305             if len(line) >maxlen:
 306                 maxlen = len(line)
 307         return maxlen
 308
 309     def KeepCursorOnScreen(self):
 310         self.sy = ForceBetween(max(0, self.cy-self.sh), self.sy, self.cy)
 311         self.sx = ForceBetween(max(0, self.cx-self.sw), self.sx, self.cx)
 312         self.AdjustScrollbars()
 313
 314     def HorizBoundaries(self):
 315         self.SetCharDimensions()
 316         maxLineLen = self.CalcMaxLineLen()
 317         self.sx = ForceBetween(0, self.sx, max(self.sw, maxLineLen - self.sw + 1))
 318         self.cx = ForceBetween(self.sx, self.cx, self.sx + self.sw - 1)
 319
 320     def VertBoundaries(self):
 321         self.SetCharDimensions()
 322         self.sy = ForceBetween(0, self.sy, max(self.sh, self.LinesInFile() - self.sh + 1))
 323         self.cy = ForceBetween(self.sy, self.cy, self.sy + self.sh - 1)
 324
 325     def cVert(self, num):
 326         self.cy = self.cy + num
 327         self.cy = ForceBetween(0, self.cy, self.LinesInFile() - 1)
 328         self.sy = ForceBetween(self.cy - self.sh + 1, self.sy, self.cy)
 329         self.cx = min(self.cx, self.CurrentLineLength())
 330
 331     def cHoriz(self, num):
 332         self.cx = self.cx + num
 333         self.cx = ForceBetween(0, self.cx, self.CurrentLineLength())
 334         self.sx = ForceBetween(self.cx - self.sw + 1, self.sx, self.cx)
 335
 336     def AboveScreen(self, row):
 337         return row < self.sy
 338
 339     def BelowScreen(self, row):
 340         return row >= self.sy + self.sh
 341
 342     def LeftOfScreen(self, col):
 343         return col < self.sx
 344
 345     def RightOfScreen(self, col):
 346         return col >= self.sx + self.sw
 347
 348 ##----------------- data structure helper functions
 349
 350     def GetText(self):
 351         return self.lines
 352
 353     def SetText(self, lines):
 354         self.InitCoords()
 355         self.lines = lines
 356         self.UnTouchBuffer()
 357         self.SelectOff()
 358         self.AdjustScrollbars()
 359         self.UpdateView(None)
 360
 361     def IsLine(self, lineNum):
 362         return (0<=lineNum) and (lineNum<self.LinesInFile())
 363
 364     def GetTextLine(self, lineNum):
 365         if self.IsLine(lineNum):
 366             return self.lines[lineNum]
 367         return ""
 368
 369     def SetTextLine(self, lineNum, text):
 370         if self.IsLine(lineNum):
 371             self.lines[lineNum] = text
 372
 373     def CurrentLineLength(self):
 374         return len(self.lines[self.cy])
 375
 376     def LinesInFile(self):
 377         return len(self.lines)
 378
 379     def UnTouchBuffer(self):
 380         self.bufferTouched = False
 381
 382     def BufferWasTouched(self):
 383         return self.bufferTouched
 384
 385     def TouchBuffer(self):
 386         self.bufferTouched = True
 387
 388
 389 ##-------------------------- Mouse scroll timing functions
 390
 391     def InitScrolling(self):
 392         # we don't rely on the windows system to scroll for us; we just
 393         # redraw the screen manually every time
 394         self.EnableScrolling(False, False)
 395         self.nextScrollTime = 0
 396         self.SCROLLDELAY = 0.050 # seconds
 397         self.scrollTimer = wx.Timer(self)
 398         self.scroller = Scroller(self)
 399
 400     def CanScroll(self):
 401        if time.time() >  self.nextScrollTime:
 402            self.nextScrollTime = time.time() + self.SCROLLDELAY
 403            return True
 404        else:
 405            return False
 406
 407     def SetScrollTimer(self):
 408         oneShot = True
 409         self.scrollTimer.Start(1000*self.SCROLLDELAY/2, oneShot)
 410         self.Bind(wx.EVT_TIMER, self.OnTimer)
 411
 412     def OnTimer(self, event):
 413         screenX, screenY = wx.GetMousePosition()
 414         x, y = self.ScreenToClientXY(screenX, screenY)
 415         self.MouseToRow(y)
 416         self.MouseToCol(x)
 417         self.SelectUpdate()
 418
 419 ##-------------------------- Mouse off screen functions
 420
 421     def HandleAboveScreen(self, row):
 422         self.SetScrollTimer()
 423         if self.CanScroll():
 424             row = self.sy - 1
 425             row = max(0, row)
 426             self.cy = row
 427
 428     def HandleBelowScreen(self, row):
 429         self.SetScrollTimer()
 430         if self.CanScroll():
 431             row = self.sy + self.sh
 432             row  = min(row, self.LinesInFile() - 1)
 433             self.cy = row
 434
 435     def HandleLeftOfScreen(self, col):
 436         self.SetScrollTimer()
 437         if self.CanScroll():
 438             col = self.sx - 1
 439             col = max(0,col)
 440             self.cx = col
 441
 442     def HandleRightOfScreen(self, col):
 443         self.SetScrollTimer()
 444         if self.CanScroll():
 445             col = self.sx + self.sw
 446             col = min(col, self.CurrentLineLength())
 447             self.cx = col
 448
 449 ##------------------------ mousing functions
 450
 451     def MouseToRow(self, mouseY):
 452         row  = self.sy + (mouseY/ self.fh)
 453         if self.AboveScreen(row):
 454             self.HandleAboveScreen(row)
 455         elif self.BelowScreen(row):
 456             self.HandleBelowScreen(row)
 457         else:
 458             self.cy  = min(row, self.LinesInFile() - 1)
 459
 460     def MouseToCol(self, mouseX):
 461         col = self.sx + (mouseX / self.fw)
 462         if self.LeftOfScreen(col):
 463             self.HandleLeftOfScreen(col)
 464         elif self.RightOfScreen(col):
 465             self.HandleRightOfScreen(col)
 466         else:
 467             self.cx = min(col, self.CurrentLineLength())
 468
 469     def MouseToCursor(self, event):
 470         self.MouseToRow(event.GetY())
 471         self.MouseToCol(event.GetX())
 472
 473     def OnMotion(self, event):
 474         if event.LeftIsDown() and self.HasCapture():
 475             self.Selecting = True
 476             self.MouseToCursor(event)
 477             self.SelectUpdate()
 478
 479     def OnLeftDown(self, event):
 480         self.MouseToCursor(event)
 481         self.SelectBegin = (self.cy, self.cx)
 482         self.SelectEnd = None
 483         self.UpdateView()
 484         self.CaptureMouse()
 485         self.SetFocus()
 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         if self:
 555             for i in range(2):
 556                 self.SetCharDimensions()
 557                 self.scroller.SetScrollbars(
 558                     self.fw, self.fh,
 559                     self.CalcMaxLineLen()+3, max(self.LinesInFile()+1, self.sh),
 560                     self.sx, self.sy)
 561
 562 #------------ backspace, delete, return
 563
 564     def BreakLine(self, event):
 565         if self.IsLine(self.cy):
 566             t = self.lines[self.cy]
 567             self.lines = self.lines[:self.cy] + [t[:self.cx],t[self.cx:]] + self.lines[self.cy+1:]
 568             self.cVert(1)
 569             self.cx = 0
 570             self.TouchBuffer()
 571
 572     def InsertChar(self,char):
 573         if self.IsLine(self.cy):
 574             t = self.lines[self.cy]
 575             t = t[:self.cx] + char + t[self.cx:]
 576             self.SetTextLine(self.cy, t)
 577             self.cHoriz(1)
 578             self.TouchBuffer()
 579
 580     def JoinLines(self):
 581         t1 = self.lines[self.cy]
 582         t2 = self.lines[self.cy+1]
 583         self.cx = len(t1)
 584         self.lines = self.lines[:self.cy] + [t1 + t2] + self.lines[self.cy+2:]
 585         self.TouchBuffer()
 586
 587
 588     def DeleteChar(self,x,y,oldtext):
 589         newtext = oldtext[:x] + oldtext[x+1:]
 590         self.SetTextLine(y, newtext)
 591         self.TouchBuffer()
 592
 593
 594     def BackSpace(self, event):
 595         t = self.GetTextLine(self.cy)
 596         if self.cx>0:
 597             self.DeleteChar(self.cx-1,self.cy,t)
 598             self.cHoriz(-1)
 599             self.TouchBuffer()
 600         elif self.cx == 0:
 601             if self.cy > 0:
 602                 self.cy -= 1
 603                 self.JoinLines()
 604                 self.TouchBuffer()
 605             else:
 606                 wx.Bell()
 607
 608     def Delete(self, event):
 609         t = self.GetTextLine(self.cy)
 610         if self.cx<len(t):
 611             self.DeleteChar(self.cx,self.cy,t)
 612             self.TouchBuffer()
 613         else:
 614             if self.cy < len(self.lines) - 1:
 615                 self.JoinLines()
 616                 self.TouchBuffer()
 617
 618     def Escape(self, event):
 619         self.SelectOff()
 620
 621     def TabKey(self, event):
 622         numSpaces = self.SpacesPerTab - (self.cx % self.SpacesPerTab)
 623         self.SingleLineInsert(' ' * numSpaces)
 624
 625 ##----------- selection routines
 626
 627     def SelectUpdate(self):
 628         self.SelectEnd = (self.cy, self.cx)
 629         self.SelectNotify(self.Selecting, self.SelectBegin, self.SelectEnd)
 630         self.UpdateView()
 631
 632     def NormalizedSelect(self):
 633         (begin, end) = (self.SelectBegin, self.SelectEnd)
 634         (bRow, bCol) = begin
 635         (eRow, eCol) = end
 636         if (bRow < eRow):
 637             return (begin, end)
 638         elif (eRow < bRow):
 639             return (end, begin)
 640         else:
 641             if (bCol < eCol):
 642                 return (begin, end)
 643             else:
 644                 return (end, begin)
 645
 646     def FindSelection(self):
 647         if self.SelectEnd is None or self.SelectBegin is None:
 648             wx.Bell()
 649             return None
 650         (begin, end) =  self.NormalizedSelect()
 651         (bRow, bCol) = begin
 652         (eRow, eCol) = end
 653         return (bRow, bCol, eRow, eCol)
 654
 655     def SelectOff(self):
 656         self.SelectBegin = None
 657         self.SelectEnd = None
 658         self.Selecting = False
 659         self.SelectNotify(False,None,None)
 660
 661     def CopySelection(self, event):
 662         selection = self.FindSelection()
 663         if selection is None:
 664             return
 665         (bRow, bCol, eRow, eCol) = selection
 666
 667         if bRow == eRow:
 668             self.SingleLineCopy(bRow, bCol, eCol)
 669         else:
 670             self.MultipleLineCopy(bRow, bCol, eRow, eCol)
 671
 672     def OnCopySelection(self, event):
 673         self.CopySelection(event)
 674         self.SelectOff()
 675
 676     def CopyToClipboard(self, linesOfText):
 677         do = wx.TextDataObject()
 678         do.SetText(os.linesep.join(linesOfText))
 679         wx.TheClipboard.Open()
 680         wx.TheClipboard.SetData(do)
 681         wx.TheClipboard.Close()
 682
 683     def SingleLineCopy(self, Row, bCol, eCol):
 684         Line = self.GetTextLine(Row)
 685         self.CopyToClipboard([Line[bCol:eCol]])
 686
 687     def MultipleLineCopy(self, bRow, bCol, eRow, eCol):
 688         bLine = self.GetTextLine(bRow)[bCol:]
 689         eLine = self.GetTextLine(eRow)[:eCol]
 690         self.CopyToClipboard([bLine] + [l for l in self.lines[bRow + 1:eRow]] + [eLine])
 691
 692     def OnDeleteSelection(self, event):
 693         selection = self.FindSelection()
 694         if selection is None:
 695             return
 696         (bRow, bCol, eRow, eCol) = selection
 697
 698         if bRow == eRow:
 699             self.SingleLineDelete(bRow, bCol, eCol)
 700         else:
 701             self.MultipleLineDelete(bRow, bCol, eRow, eCol)
 702
 703         self.TouchBuffer()
 704
 705         self.cy = bRow
 706         self.cx = bCol
 707         self.SelectOff()
 708         self.UpdateView()
 709
 710
 711     def SingleLineDelete(self, Row, bCol, eCol):
 712         ModLine = self.GetTextLine(Row)
 713         ModLine = ModLine[:bCol] + ModLine[eCol:]
 714         self.SetTextLine(Row,ModLine)
 715
 716     def MultipleLineDelete(self, bRow, bCol, eRow, eCol):
 717         bLine = self.GetTextLine(bRow)
 718         eLine = self.GetTextLine(eRow)
 719         ModLine = bLine[:bCol] + eLine[eCol:]
 720         self.lines[bRow:eRow + 1] = [ModLine]
 721
 722     def OnPaste(self, event):
 723         do = wx.TextDataObject()
 724         wx.TheClipboard.Open()
 725         success = wx.TheClipboard.GetData(do)
 726         wx.TheClipboard.Close()
 727         if success:
 728             pastedLines = LineSplitter(do.GetText())
 729         else:
 730             wx.Bell()
 731             return
 732         if len(pastedLines) == 0:
 733             wx.Bell()
 734             return
 735         elif len(pastedLines) == 1:
 736             self.SingleLineInsert(pastedLines[0])
 737         else:
 738             self.MultipleLinePaste(pastedLines)
 739
 740     def SingleLineInsert(self, newText):
 741         ModLine = self.GetTextLine(self.cy)
 742         ModLine = ModLine[:self.cx] + newText + ModLine[self.cx:]
 743         self.SetTextLine(self.cy, ModLine)
 744         self.cHoriz(len(newText))
 745         self.TouchBuffer()
 746         self.UpdateView()
 747
 748     def MultipleLinePaste(self, pastedLines):
 749         FirstLine = LastLine = self.GetTextLine(self.cy)
 750         FirstLine = FirstLine[:self.cx] + pastedLines[0]
 751         LastLine = pastedLines[-1] + LastLine[self.cx:]
 752
 753         NewSlice = [FirstLine]
 754         NewSlice += [l for l in pastedLines[1:-1]]
 755         NewSlice += [LastLine]
 756         self.lines[self.cy:self.cy + 1] = NewSlice
 757
 758         self.cy = self.cy + len(pastedLines)-1
 759         self.cx = len(pastedLines[-1])
 760         self.TouchBuffer()
 761         self.UpdateView()
 762
 763     def OnCutSelection(self,event):
 764         self.CopySelection(event)
 765         self.OnDeleteSelection(event)
 766
 767 #-------------- Keyboard movement implementations
 768
 769     def MoveDown(self, event):
 770         self.cVert(+1)
 771
 772     def MoveUp(self, event):
 773         self.cVert(-1)
 774
 775     def MoveLeft(self, event):
 776         if self.cx == 0:
 777             if self.cy == 0:
 778                 wx.Bell()
 779             else:
 780                 self.cVert(-1)
 781                 self.cx = self.CurrentLineLength()
 782         else:
 783             self.cx -= 1
 784
 785     def MoveRight(self, event):
 786         linelen = self.CurrentLineLength()
 787         if self.cx == linelen:
 788             if self.cy == len(self.lines) - 1:
 789                 wx.Bell()
 790             else:
 791                 self.cx = 0
 792                 self.cVert(1)
 793         else:
 794             self.cx += 1
 795
 796
 797     def MovePageDown(self, event):
 798         self.cVert(self.sh)
 799
 800     def MovePageUp(self, event):
 801         self.cVert(-self.sh)
 802
 803     def MoveHome(self, event):
 804         self.cx = 0
 805
 806     def MoveEnd(self, event):
 807         self.cx = self.CurrentLineLength()
 808
 809     def MoveStartOfFile(self, event):
 810         self.cy = 0
 811         self.cx = 0
 812
 813     def MoveEndOfFile(self, event):
 814         self.cy = len(self.lines) - 1
 815         self.cx = self.CurrentLineLength()
 816
 817 #-------------- Key handler mapping tables
 818
 819     def SetMoveSpecialFuncs(self, action):
 820         action[wx.WXK_DOWN]  = self.MoveDown
 821         action[wx.WXK_UP]    = self.MoveUp
 822         action[wx.WXK_LEFT]  = self.MoveLeft
 823         action[wx.WXK_RIGHT] = self.MoveRight
 824         action[wx.WXK_NEXT]  = self.MovePageDown
 825         action[wx.WXK_PRIOR] = self.MovePageUp
 826         action[wx.WXK_HOME]  = self.MoveHome
 827         action[wx.WXK_END]   = self.MoveEnd
 828
 829     def SetMoveSpecialControlFuncs(self, action):
 830         action[wx.WXK_HOME] = self.MoveStartOfFile
 831         action[wx.WXK_END]  = self.MoveEndOfFile
 832
 833     def SetAltFuncs(self, action):
 834         # subclass implements
 835         pass
 836
 837     def SetControlFuncs(self, action):
 838         action['c'] = self.OnCopySelection
 839         action['d'] = self.OnDeleteSelection
 840         action['v'] = self.OnPaste
 841         action['x'] = self.OnCutSelection
 842
 843     def SetSpecialControlFuncs(self, action):
 844         action[wx.WXK_INSERT] = self.OnCopySelection
 845
 846     def SetShiftFuncs(self, action):
 847         action[wx.WXK_DELETE] = self.OnCutSelection
 848         action[wx.WXK_INSERT] = self.OnPaste
 849
 850     def SetSpecialFuncs(self, action):
 851         action[wx.WXK_BACK]   = self.BackSpace
 852         action[wx.WXK_DELETE] = self.Delete
 853         action[wx.WXK_RETURN] = self.BreakLine
 854         action[wx.WXK_ESCAPE] = self.Escape
 855         action[wx.WXK_TAB]    = self.TabKey
 856
 857 ##-------------- Logic for key handlers
 858
 859
 860     def Move(self, keySettingFunction, key, event):
 861         action = {}
 862         keySettingFunction(action)
 863
 864         if not action.has_key(key):
 865             return False
 866
 867         if event.ShiftDown():
 868             if not self.Selecting:
 869                 self.Selecting = True
 870                 self.SelectBegin = (self.cy, self.cx)
 871             action[key](event)
 872             self.SelectEnd = (self.cy, self.cx)
 873         else:
 874             action[key](event)
 875             if self.Selecting:
 876                 self.Selecting = False
 877
 878         self.SelectNotify(self.Selecting, self.SelectBegin, self.SelectEnd)
 879         self.UpdateView()
 880         return True
 881
 882     def MoveSpecialKey(self, event, key):
 883         return self.Move(self.SetMoveSpecialFuncs, key, event)
 884
 885     def MoveSpecialControlKey(self, event, key):
 886         if not event.ControlDown():
 887             return False
 888         return self.Move(self.SetMoveSpecialControlFuncs, key, event)
 889
 890     def Dispatch(self, keySettingFunction, key, event):
 891         action = {}
 892         keySettingFunction(action)
 893         if action.has_key(key):
 894             action[key](event)
 895             self.UpdateView()
 896             return True
 897         return False
 898
 899     def ModifierKey(self, key, event, modifierKeyDown, MappingFunc):
 900         if not modifierKeyDown:
 901             return False
 902
 903         key = self.UnixKeyHack(key)
 904         try:
 905             key = chr(key)
 906         except:
 907             return False
 908         if not self.Dispatch(MappingFunc, key, event):
 909             wx.Bell()
 910         return True
 911
 912     def ControlKey(self, event, key):
 913         return self.ModifierKey(key, event, event.ControlDown(), self.SetControlFuncs)
 914
 915     def AltKey(self, event, key):
 916         return self.ModifierKey(key, event, event.AltDown(), self.SetAltFuncs)
 917
 918     def SpecialControlKey(self, event, key):
 919         if not event.ControlDown():
 920             return False
 921         if not self.Dispatch(self.SetSpecialControlFuncs, key, event):
 922             wx.Bell()
 923         return True
 924
 925     def ShiftKey(self, event, key):
 926         if not event.ShiftDown():
 927             return False
 928         return self.Dispatch(self.SetShiftFuncs, key, event)
 929
 930     def NormalChar(self, event, key):
 931         self.SelectOff()
 932
 933         # regular ascii
 934         if not self.Dispatch(self.SetSpecialFuncs, key, event):
 935             if (key>31) and (key<256):
 936                 self.InsertChar(chr(key))
 937             else:
 938                 wx.Bell()
 939                 return
 940         self.UpdateView()
 941         self.AdjustScrollbars()
 942
 943     def OnChar(self, event):
 944         key = event.GetKeyCode()
 945         filters = [self.AltKey,
 946                    self.MoveSpecialControlKey,
 947                    self.ControlKey,
 948                    self.SpecialControlKey,
 949                    self.MoveSpecialKey,
 950                    self.ShiftKey,
 951                    self.NormalChar]
 952         for filter in filters:
 953             if filter(event,key):
 954                 break
 955         return 0
 956
 957 #----------------------- Eliminate memory leaks
 958
 959     def OnDestroy(self, event):
 960         self.mdc = None
 961         self.odc = None
 962         self.bgColor = None
 963         self.fgColor = None
 964         self.font = None
 965         self.selectColor = None
 966         self.scrollTimer = None
 967         self.eofMarker = None
 968
 969 #--------------------  Abstract methods for subclasses
 970
 971     def OnClick(self):
 972         pass
 973
 974     def SelectNotify(self, Selecting, SelectionBegin, SelectionEnd):
 975         pass
 976