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