720 lines
22 KiB
Plaintext
720 lines
22 KiB
Plaintext
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* Editor Class (base for Memoedit(), debugger, etc.)
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*
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* Copyright 2000 Maurilio Longo <maurilio.longo@libero.it>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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/* TODO: Load, Save, GotoLine, SkipLine methods (to be used with debugger)
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Test to see if it behaves more or less like MemoEdit() */
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#include "hbclass.ch"
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#include "error.ch"
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#include "fileio.ch"
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#include "inkey.ch"
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#include "setcurs.ch"
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CLASS TEditor
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DATA cFile INIT "" // name of file being edited
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DATA aText INIT {} // array with lines of text being edited
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DATA naTextLen INIT 0 // number of lines of text inside aText.
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DATA nTop // boundaries of editor window, without box around
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DATA nLeft
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DATA nBottom
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DATA nRight
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DATA nFirstCol INIT 1 // FirstCol/Row of current text visible inside editor window
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DATA nFirstRow INIT 1
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DATA nRow INIT 1 // Cursor position inside aText (nRow) and inside current line of text (nCol)
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DATA nCol INIT 1
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DATA nNumCols INIT 1 // How many columns / rows can be displayed inside editor window
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DATA nNumRows INIT 1
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DATA lInsert INIT .F. // Is editor in Insert mode or in Overstrike one?
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DATA nTabWidth INIT 8 // Size of Tab chars
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DATA lEditAllow INIT .T. // Are changes to text allowed?
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DATA lSaved INIT .F. // True if user exited editor with K_CTRL_W
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DATA lWordWrap INIT .F. // True if word wrapping is active
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DATA nWordWrapCol INIT 0 // At which column word wrapping occurs
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METHOD New(cString, nTop, nLeft, nBottom,; // Converts a string to an array of strings splitting input string at EOL boundaries
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nRight, lEditMode, cUdF, nLineLength,;
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nTabSize)
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METHOD AddLine(cLine, lSoftCR) // Add a new Line of text at end of current text
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METHOD InsertLine(cLine, lSoftCR, nRow) // Insert a line of text at a defined row
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METHOD RemoveLine(nRow) // Remove a line of text
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METHOD GetLine(nRow) // Return line n of text
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METHOD LineLen(nRow) INLINE Len(::aText[nRow]:cText) // Return text length of line n
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METHOD SplitLine(nRow) // If a line of text is longer than nWordWrapCol divides it into multiple lines
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METHOD GetText() // Returns aText as a string (for MemoEdit())
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METHOD RefreshWindow() // Redraw a window
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METHOD RefreshLine() // Redraw a line
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METHOD RefreshColumn() // Redraw a column of text
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METHOD MoveCursor(nKey) // Move cursor inside text / window (needs a movement key)
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METHOD InsertState(lInsState) // Changes lInsert value and insertion / overstrike mode of editor
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METHOD Edit(nPassedKey) // Handles input (can receive a key in which case handles only this key and then exits)
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ENDCLASS
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// Converts a string to an array of strings splitting input string at EOL boundaries
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STATIC function Text2Array(cString, nWordWrapCol)
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LOCAL cLine, nTokNum, aArray, cEOL, nEOLLen, nRetLen, ncSLen
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LOCAL nFirstSpace, cSplittedLine
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nTokNum := 1
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aArray := {}
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cEOL := HB_OSNewLine()
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nEOLLen := Len(cEOL)
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nRetLen := 0
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ncSLen := Len(cString)
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while nRetLen < ncSLen
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/* TOFIX: Note that __StrToken is not able to cope with delimiters longer than one char */
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// Dos - OS/2 - Windows have CRLF as EOL
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if nEOLLen > 1
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cLine := StrTran(__StrToken(cString, nTokNum++, cEOL), SubStr(cEOL, 2), "")
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else
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cLine := __StrToken(cString, nTokNum++, cEOL)
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endif
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nRetLen += Len(cLine) + nEOLLen
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if !nWordWrapCol == NIL .AND. Len(cLine) > nWordWrapCol
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while !Empty(cLine)
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// Split line at nWordWrapCol boundary
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if Len(cLine) > nWordWrapCol
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nFirstSpace := nWordWrapCol
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while SubStr(cLine, --nFirstSpace, 1) <> " " .AND. nFirstSpace > 1
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enddo
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if nFirstSpace > 1
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cSplittedLine := Left(cLine, nFirstSpace)
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else
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cSplittedLine := Left(cLine, nWordWrapCol)
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endif
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AAdd(aArray, TTextLine():New(cSplittedLine, .T.))
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else
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// remainder of line is shorter than split point
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cSplittedLine := cLine
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AAdd(aArray, TTextLine():New(cSplittedLine, .F.))
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endif
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cLine := Right(cLine, Len(cLine) - Len(cSplittedLine))
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enddo
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else
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AAdd(aArray, TTextLine():New(cLine, .F.))
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endif
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enddo
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return aArray
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// Converts an array of text lines to a String
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METHOD GetText() CLASS TEditor
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LOCAL cString := ""
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LOCAL cEOL := HB_OSNewLine()
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if ::lWordWrap
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AEval(::aText, {|cItem| cString += cItem:cText + iif(cItem:lSoftCR, "", cEOL) })
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else
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AEval(::aText, {|cItem| cString += cItem:cText + cEOL })
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endif
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return cString
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METHOD New(cString, nTop, nLeft, nBottom, nRight, lEditMode, cUdF, nLineLength, nTabSize) CLASS TEditor
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::aText := Text2Array(cString, nLineLength)
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::naTextLen := Len(::aText)
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// editor window boundaries
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::nTop := nTop
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::nLeft := nLeft
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::nBottom := nBottom
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::nRight := nRight
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// How many cols and rows are available
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::nNumCols := nRight - nLeft + 1
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::nNumRows := nBottom - nTop + 1
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if !lEditMode == NIL
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::lEditAllow := lEditMode
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endif
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// set correct insert state
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if ::lEditAllow
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::InsertState(::lInsert)
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endif
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// is word wrap required?
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if !nLineLength == NIL
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::lWordWrap := .T.
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::nWordWrapCol := nLineLength
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endif
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// how many spaces for each tab?
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if !nTabSize == NIL
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::nTabWidth := nTabSize
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endif
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// Empty area of screen which will hold editor window
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Scroll(nTop, nLeft, nBottom, nRight)
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// Set cursor upper left corner
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SetPos(::nTop, ::nLeft)
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return Self
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// Add a new Line of text at end of current text
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METHOD AddLine(cLine, lSoftCR) CLASS TEditor
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AAdd(::aText, TTextLine():New(cLine, lSoftCR))
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::naTextLen++
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return Self
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// Insert a line of text at a defined row
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METHOD InsertLine(cLine, lSoftCR, nRow) CLASS TEditor
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::AddLine()
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AIns(::aText, nRow)
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::aText[nRow] := TTextLine():New(cLine, lSoftCR)
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return Self
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// Remove a line of text
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METHOD RemoveLine(nRow) CLASS TEditor
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ADel(::aText, nRow)
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ASize(::aText, --::naTextLen)
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return Self
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// Return line n of text
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METHOD GetLine(nRow) CLASS TEditor
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if nRow <= ::naTextLen .AND. nRow > 0
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return ::aText[nRow]:cText
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else
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return ""
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endif
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return Self
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// Rebuild a long line from multiple short ones (wrapped at soft CR)
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STATIC function GetParagraph(oSelf, nRow)
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local cLine := ""
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while oSelf:aText[nRow]:lSoftCR
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cLine += oSelf:aText[nRow]:cText
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// I don't need to increment nRow since I'm removing lines, ie line n is
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// a different line each time I add it to cLine
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oSelf:RemoveLine(nRow)
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enddo
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// Last line, or only one line
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cLine += oSelf:aText[nRow]:cText
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oSelf:RemoveLine(nRow)
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return cLine
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// If a line of text is longer than nWordWrapCol divides it into multiple lines,
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// Used during text editing to reflow a paragraph
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METHOD SplitLine(nRow) CLASS TEditor
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local nFirstSpace, cLine, cSplittedLine, nStartRow
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local nOCol, nORow, lMoveToNextLine, nPosInWord, nI
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// Do something only if Word Wrapping is on
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if ::lWordWrap .AND. (::LineLen(nRow) > ::nWordWrapCol)
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nOCol := Col()
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nORow := Row()
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// Move cursor to next line if you will move the word which I'm over to next line
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// ie, since word wrapping happens at spaces if first space is behind cursor
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lMoveToNextLine := Rat(" ", RTrim(::GetLine(nRow))) < ::nCol
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nPosInWord := Len(::GetLine(nRow)) - ::nCol
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nStartRow := nRow
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cLine := GetParagraph(Self, nRow)
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while !Empty(cLine)
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if Len(cLine) > ::nWordWrapCol
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nFirstSpace := ::nWordWrapCol
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// Split line at fist space before current position
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while SubStr(cLine, --nFirstSpace, 1) <> " " .AND. nFirstSpace > 1
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enddo
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// If there is a space before beginning of line split there
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if nFirstSpace > 1
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cSplittedLine := Left(cLine, nFirstSpace)
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else
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// else split at current cursor position
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cSplittedLine := Left(cLine, ::nCol - 1)
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endif
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::InsertLine(cSplittedLine, .T., nStartRow++)
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else
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// remainder of line
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cSplittedLine := cLine
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::InsertLine(cSplittedLine, .F., nStartRow++)
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endif
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cLine := Right(cLine, Len(cLine) - Len(cSplittedLine))
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enddo
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if lMoveToNextLine
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::MoveCursor(K_DOWN)
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::MoveCursor(K_HOME)
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::MoVeCursor(K_CTRL_RIGHT)
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if nPosInWord > 0
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// from 0 since I have to take into account previous K_CTRL_RIGHT which moves me past end of word
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for nI := 0 to nPosInWord
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::MoveCursor(K_LEFT)
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next
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endif
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else
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SetPos(nORow, nOCol)
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endif
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::RefreshWindow()
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endif
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return Self
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// Redraws a screenfull of text
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METHOD RefreshWindow() CLASS TEditor
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LOCAL i, nOCol, nORow, nOCur
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nOCol := Col()
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nORow := Row()
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nOCur := SetCursor(SC_NONE)
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for i := 0 to Min(::nNumRows - 1, ::naTextLen - 1)
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DispOutAt(::nTop + i, ::nLeft, PadR(SubStr(::GetLine(::nFirstRow + i), ::nFirstCol, ::nNumCols), ::nNumCols, " "))
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next
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// Clear rest of editor window (needed when deleting lines of text)
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if ::naTextLen < ::nNumRows
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Scroll(::nTop + ::naTextLen, ::nLeft, ::nBottom, ::nRight)
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endif
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SetCursor(nOCur)
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SetPos(nORow, nOCol)
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return Self
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// Redraws current screen line
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METHOD RefreshLine() CLASS TEditor
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LOCAL nOCol, nORow
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nOCol := Col()
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nORow := Row()
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DispOutAt(Row(), ::nLeft, PadR(SubStr(::GetLine(::nRow), ::nFirstCol, ::nNumCols), ::nNumCols, " "))
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SetPos(nORow, nOCol)
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return Self
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// Refreshes only one screen column of text (for Left() and Right() movements)
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METHOD RefreshColumn() CLASS TEditor
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LOCAL i, nOCol, nORow, nOCur
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nOCol := Col()
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nORow := Row()
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nOCur := SetCursor(SC_NONE)
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for i := 0 to Min(::nNumRows - 1, ::naTextLen - 1)
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DispOutAt(::nTop + i, nOCol, SubStr(::GetLine(::nFirstRow + i), ::nCol, 1))
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next
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SetCursor(nOCur)
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SetPos(nORow, nOCol)
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return Self
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// Handles cursor movements inside text array
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METHOD MoveCursor(nKey) CLASS TEditor
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LOCAL lMoveKey := .T.
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do case
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case (nKey == K_DOWN)
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if !::lEditAllow
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while Row() < ::nBottom .AND. ::nRow < ::naTextLen
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::nRow++
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SetPos(Row() + 1, Col())
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enddo
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endif
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if Row() == ::nBottom
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if ::nRow < ::naTextLen
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Scroll(::nTop, ::nLeft, ::nBottom, ::nRight, 1)
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::nFirstRow++
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::nRow++
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::RefreshLine()
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endif
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else
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if ::nRow < ::naTextLen
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::nRow++
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SetPos(Row() + 1, Col())
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endif
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endif
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case (nKey == K_PGDN)
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if ::nRow + ::nNumRows < ::naTextLen
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::nRow += ::nNumRows
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::nFirstRow += ::nNumRows
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if ::nFirstRow + ::nNumRows > ::naTextLen
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::nFirstRow -= ((::nFirstRow + ::nNumRows) - ::naTextLen) + 1
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endif
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else
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::nFirstRow := Max(::naTextLen - ::nNumRows + 1, 1)
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::nRow := ::naTextLen
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SetPos(Min(::nTop + ::naTextLen - 1, ::nBottom), Col())
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endif
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::RefreshWindow()
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case (nKey == K_CTRL_PGDN)
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::nRow := ::naTextLen
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::nCol := Max(::LineLen(::nRow), 1)
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::nFirstRow := Max(::naTextLen - ::nNumRows + 1, 1)
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::nFirstCol := Max(::nCol - ::nNumCols + 1, 1)
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SetPos(Min(::nBottom, ::naTextLen), Min(::nLeft + ::nCol - 1, ::nRight))
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::RefreshWindow()
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case (nKey == K_UP)
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if !::lEditAllow
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while Row() > ::nTop .AND. ::nRow > 1
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::nRow--
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SetPos(Row() -1, Col())
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enddo
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endif
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if Row() == ::nTop
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if ::nRow > 1
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Scroll(::nTop, ::nLeft, ::nBottom, ::nRight, -1)
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::nFirstRow--
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::nRow--
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::RefreshLine()
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endif
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else
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::nRow--
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SetPos(Row() - 1, Col())
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endif
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case (nKey == K_PGUP)
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if (::nRow - ::nNumRows) > 1
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::nRow -= ::nNumRows
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::nFirstRow -= ::nNumRows
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if ::nFirstRow < 1
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::nFirstRow := 1
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endif
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else
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::nFirstRow := 1
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::nRow := 1
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SetPos(::nTop, Col())
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endif
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::RefreshWindow()
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case (nKey == K_CTRL_PGUP)
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::nRow := 1
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::nCol := 1
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::nFirstCol := 1
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::nFirstRow := 1
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SetPos(::nTop, ::nLeft)
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::RefreshWindow()
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case (nKey == K_RIGHT)
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if Col() == ::nRight
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if ::nCol <= iif(::lWordWrap, ::nWordWrapCol, ::LineLen(::nRow))
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Scroll(::nTop, ::nLeft, ::nBottom, ::nRight,, 1)
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::nFirstCol++
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::nCol++
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::RefreshColumn()
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endif
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else
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::nCol++
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SetPos(Row(), Col() + 1)
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endif
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case (nKey == K_CTRL_RIGHT)
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// NOTE: should be faster without call to ::GetLine()
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while ::nCol <= iif(::lWordWrap, Min(::nWordWrapCol, ::LineLen(::nRow)), ::LineLen(::nRow)) .AND. SubStr(::aText[::nRow]:cText, ::nCol, 1) <> " "
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::MoveCursor(K_RIGHT)
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enddo
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while ::nCol <= iif(::lWordWrap, Min(::nWordWrapCol, ::LineLen(::nRow)), ::LineLen(::nRow)) .AND. SubStr(::aText[::nRow]:cText, ::nCol, 1) == " "
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::MoveCursor(K_RIGHT)
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enddo
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case (nKey == K_LEFT)
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if Col() == ::nLeft
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if ::nCol > 1
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Scroll(::nTop, ::nLeft, ::nBottom, ::nRight,, -1)
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::nFirstCol--
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::nCol--
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::RefreshColumn()
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endif
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else
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::nCol--
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SetPos(Row(), Col() - 1)
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endif
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case (nKey == K_CTRL_LEFT)
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while ::nCol > 1 .AND. SubStr(::aText[::nRow]:cText, ::nCol, 1) <> " "
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::MoveCursor(K_LEFT)
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enddo
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while ::nCol > 1 .AND. SubStr(::aText[::nRow]:cText, ::nCol, 1) == " "
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::MoveCursor(K_LEFT)
|
|
enddo
|
|
|
|
case (nKey == K_HOME)
|
|
::nCol := 1
|
|
::nFirstCol := 1
|
|
SetPos(Row(), ::nLeft)
|
|
::RefreshWindow()
|
|
|
|
case (nKey == K_CTRL_HOME)
|
|
::nCol := 1
|
|
::nFirstCol := 1
|
|
::nRow -= (Row() - ::nTop)
|
|
SetPos(::nTop, ::nLeft)
|
|
::RefreshWindow()
|
|
|
|
case (nKey == K_END)
|
|
// Empty lines have 0 len
|
|
::nCol := Max(::LineLen(::nRow), 1)
|
|
::nFirstCol := Max(::nCol - ::nNumCols + 1, 1)
|
|
SetPos(Row(), Min(::nLeft + ::nCol - 1, ::nRight))
|
|
::RefreshWindow()
|
|
|
|
case (nKey == K_CTRL_END)
|
|
::nRow += (::nBottom - Row())
|
|
if ::nRow > ::naTextLen
|
|
::nRow := ::naTextLen
|
|
endif
|
|
::nCol := Max(::LineLen(::nRow), 1)
|
|
::nFirstCol := Max(::nCol - ::nNumCols + 1, 1)
|
|
SetPos(Min(::nBottom, ::naTextLen), Min(::nLeft + ::nCol - 1, ::nRight))
|
|
::RefreshWindow()
|
|
|
|
otherwise
|
|
lMoveKey := .F.
|
|
|
|
endcase
|
|
|
|
return lMoveKey
|
|
|
|
|
|
// Changes lInsert value and insertion / overstrike mode of editor
|
|
METHOD InsertState(lInsState) CLASS TEditor
|
|
|
|
::lInsert := lInsState
|
|
SET(_SET_INSERT, lInsState)
|
|
|
|
return Self
|
|
|
|
|
|
// if editing isn't allowed we enter this loop which
|
|
// handles only movement keys and discards all the others
|
|
STATIC procedure BrowseText(oSelf)
|
|
|
|
LOCAL nKey
|
|
|
|
while (nKey := InKey(0)) <> K_ESC
|
|
oSelf:MoveCursor(nKey)
|
|
enddo
|
|
|
|
return
|
|
|
|
|
|
// Edits text
|
|
METHOD Edit(nPassedKey) CLASS TEditor
|
|
|
|
LOCAL i, nKey, lOldInsert
|
|
LOCAL lKeepGoing := .T.
|
|
|
|
if !::lEditAllow
|
|
BrowseText(Self)
|
|
|
|
else
|
|
|
|
while lKeepGoing
|
|
|
|
// If I've been called with a key already preset, evaluate this key and then exit
|
|
if nPassedKey == NIL
|
|
nKey := InKey(0)
|
|
else
|
|
lKeepGoing := .F.
|
|
nKey := nPassedKey
|
|
endif
|
|
|
|
do case
|
|
case (nKey >= 32 .AND. nKey <= 255)
|
|
// If I'm past EOL I need to add as much spaces as I need to reach ::nCol
|
|
if ::nCol > ::LineLen(::nRow)
|
|
::aText[::nRow]:cText += Space(::nCol - ::LineLen(::nRow))
|
|
endif
|
|
// insert char if in insert mode or at end of current line
|
|
if ::lInsert .OR. (::nCol > ::LineLen(::nRow))
|
|
::aText[::nRow]:cText := Stuff(::aText[::nRow]:cText, ::nCol, 0, Chr(nKey))
|
|
else
|
|
::aText[::nRow]:cText := Stuff(::aText[::nRow]:cText, ::nCol, 1, Chr(nKey))
|
|
endif
|
|
::MoveCursor(K_RIGHT)
|
|
::RefreshLine()
|
|
::SplitLine(::nRow)
|
|
|
|
case (nKey == K_RETURN)
|
|
if ::lInsert .OR. ::nRow == ::naTextLen
|
|
if ::LineLen(::nRow) > 0
|
|
// Split current line at cursor position
|
|
::InsertLine(Right(::aText[::nRow]:cText, ::LineLen(::nRow) - ::nCol + 1), ::aText[::nRow]:lSoftCR, ::nRow + 1)
|
|
::aText[::nRow]:cText := Left(::aText[::nRow]:cText, ::nCol - 1)
|
|
if ::lWordWrap
|
|
::aText[::nRow]:lSoftCR := .F.
|
|
endif
|
|
else
|
|
::InsertLine("", .F., ::nRow + 1)
|
|
endif
|
|
endif
|
|
::MoveCursor(K_DOWN)
|
|
::MoveCursor(K_HOME)
|
|
|
|
case (nKey == K_INS)
|
|
::InsertState(!::lInsert)
|
|
|
|
case (nKey == K_DEL)
|
|
::aText[::nRow]:cText := Stuff(::aText[::nRow]:cText, ::nCol, 1, "")
|
|
::RefreshLine()
|
|
if ::LineLen(::nRow) == 0
|
|
::Edit(K_CTRL_Y)
|
|
endif
|
|
|
|
case (nKey == K_TAB)
|
|
// insert char if in insert mode or at end of current line
|
|
if ::lInsert .OR. (::nCol == ::LineLen(::nRow))
|
|
::aText[::nRow]:cText := Stuff(::aText[::nRow]:cText, ::nCol, 0, Space(::nTabWidth))
|
|
endif
|
|
for i := 1 to ::nTabWidth
|
|
::MoveCursor(K_RIGHT)
|
|
next
|
|
::RefreshLine()
|
|
|
|
case (nKey == K_BS)
|
|
// delete previous character
|
|
::aText[::nRow]:cText := Stuff(::aText[::nRow]:cText, --::nCol, 1, "")
|
|
// correct column position for next call to MoveCursor()
|
|
::nCol++
|
|
::MoveCursor(K_LEFT)
|
|
::RefreshLine()
|
|
|
|
case (nKey == K_CTRL_Y)
|
|
if ::naTextLen > 1
|
|
::RemoveLine(::nRow)
|
|
// if we have less lines of text than our current position, up one line
|
|
if ::nRow > ::naTextLen
|
|
::nRow := Max(::nRow - 1, 1)
|
|
// if our position on screen exceeds text length, up one row
|
|
if (::nFirstRow + ::nNumRows - 1) > ::naTextLen
|
|
SetPos(Max(Row() -1, ::nTop), Col())
|
|
endif
|
|
// if first line of displayed text is less than length of text
|
|
if ::nFirstRow > ::naTextLen
|
|
::nFirstRow := Max(::nFirstRow - 1, 1)
|
|
endif
|
|
endif
|
|
::RefreshWindow()
|
|
else
|
|
::aText[::nRow]:cText := ""
|
|
::RefreshLine()
|
|
endif
|
|
|
|
case (::MoveCursor(nKey))
|
|
// if it's a movement key ::MoveCursor() handles it
|
|
|
|
case (nKey == K_ALT_W)
|
|
/* TOFIX: Not clipper compatible */
|
|
::lSaved := .T.
|
|
lKeepGoing := .F.
|
|
|
|
case (nKey == K_ESC)
|
|
lKeepGoing := .F.
|
|
|
|
otherwise
|
|
/* TODO: Here we should call an user defined function (to match memoedit() behaviour) */
|
|
endcase
|
|
enddo
|
|
endif
|
|
|
|
return Self
|
|
|