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harbour-core/src/rtl/scrollbr.prg
Viktor Szakats 5a2a287752 2017-09-08 16:00 UTC Viktor Szakats (vszakats users.noreply.github.com) 
* *
    * partial sync with the 3.4 fork codebase. These are the things
      synces for the most part:
      - copyright headers
      - grammar/typos in comments and some readmes
      - comment/whitespace/decorations
      - variable scoping in C files
      - DO CASE/SWITCH and some other alternate syntax usage
      - minimal amount of human readable text in strings
      - minor code updates
      - HB_TRACE() void * casts for pointers and few other changes to
        avoid C compiler warnings
      - various other, minor code cleanups
      - only Harbour/C code/headers were touched in src, utils, contrib,
        include. No 3rd party code, no make files, and with just a few
        exceptions, no 'tests' code was touched.
      - certain components were not touched were 3.4 diverged too much
        already, like f.e. hbmk2, hbssl, hbcurl, hbexpat
      - the goal was that no actual program logic should be altered by
        these changes. Except some possible minor exceptions, any such
        change is probably a bug in this patch.
      It's a massive patch, if you find anything broken after it, please
      open an Issue with the details. Build test was done on macOS.
      The goal is make it easier to see what actual code/logic was changed
      in 3.4 compared to 3.2 and to make patches easier to apply in both
      ways.
2017-09-08 16:25:13 +00:00

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/*
* ScrollBar class
*
* Copyright 2000 Luiz Rafael Culik <culik@sl.conex.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file LICENSE.txt. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
*
* As a special exception, the Harbour Project gives permission for
* additional uses of the text contained in its release of Harbour.
*
* The exception is that, if you link the Harbour libraries with other
* files to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the Harbour library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the Harbour
* Project under the name Harbour. If you copy code from other
* Harbour Project or Free Software Foundation releases into a copy of
* Harbour, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for Harbour, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*
*/
#include "hbclass.ch"
#include "button.ch"
#include "color.ch"
/* NOTE: Harbour doesn't support CA-Cl*pper 5.3 GUI functionality, but
it has all related variables and methods. */
/* NOTE: CA-Cl*pper 5.3 uses a mixture of QQOut(), DevOut(), Disp*()
functions to generate screen output. Harbour uses Disp*()
functions only. [vszakats] */
#ifdef HB_COMPAT_C53
CREATE CLASS ScrollBar FUNCTION HBScrollBar
EXPORTED:
VAR cargo
METHOD barLength() SETGET
METHOD bitmaps( aBitmaps ) SETGET
METHOD colorSpec( cColorSpec ) SETGET
METHOD current( nCurrent ) SETGET
METHOD end( nEnd ) SETGET
METHOD offset( nOffset ) SETGET
METHOD orient( nOrient ) SETGET
METHOD sBlock( bSBlock ) SETGET
METHOD start( nStart ) SETGET
METHOD style( cStyle ) SETGET
METHOD thumbPos( nThumbPos ) SETGET
METHOD total( nTotal ) SETGET
METHOD display()
METHOD update()
METHOD hitTest( nMRow, nMCol )
METHOD New( nStart, nEnd, nOffset, bSBlock, nOrient ) /* NOTE: This method is a Harbour extension [vszakats] */
PROTECTED:
VAR aBitmaps
VAR nBarLength
VAR cColorSpec
VAR cStyle
VAR nCurrent INIT 1
VAR nEnd INIT 0
VAR nOffset
VAR nOrient
VAR nStart INIT 0
VAR nThumbPos INIT 1
VAR nTotal INIT 100
VAR bSBlock
VAR lOverride INIT .F.
METHOD CalcThumbPos()
ENDCLASS
METHOD display() CLASS ScrollBar
LOCAL cColor
LOCAL cStyle
LOCAL nOffset
LOCAL nStart
LOCAL nEnd
LOCAL nPos
IF ::CalcThumbPos()
cStyle := ::cStyle
nOffset := ::nOffset
nStart := ::nStart
nEnd := ::nEnd - 1
DispBegin()
cColor := hb_ColorIndex( ::cColorSpec, 0 )
IF ::nOrient == SCROLL_VERTICAL
FOR nPos := nStart + 1 TO nEnd
hb_DispOutAt( nPos, nOffset, SubStr( cStyle, 2, 1 ), cColor )
NEXT
cColor := hb_ColorIndex( ::cColorSpec, 1 )
hb_DispOutAt( nStart, nOffset, SubStr( cStyle, 1, 1 ), cColor )
hb_DispOutAt( nStart + ::nThumbPos, nOffset, SubStr( cStyle, 3, 1 ), cColor )
hb_DispOutAt( nEnd + 1, nOffset, SubStr( cStyle, 4, 1 ), cColor )
ELSE
hb_DispOutAt( nOffset, nStart + 1, Replicate( SubStr( cStyle, 2, 1 ), nEnd - nStart ), cColor )
cColor := hb_ColorIndex( ::cColorSpec, 1 )
hb_DispOutAt( nOffset, nStart, SubStr( cStyle, 1, 1 ), cColor )
hb_DispOutAt( nOffset, nStart + ::nThumbPos, SubStr( cStyle, 3, 1 ), cColor )
hb_DispOutAt( nOffset, nEnd + 1, SubStr( cStyle, 4, 1 ), cColor )
ENDIF
DispEnd()
RETURN .T.
ENDIF
RETURN .F.
METHOD update() CLASS ScrollBar
LOCAL nOldThumbPos := ::nThumbPos
IF HB_ISEVALITEM( ::bSBlock )
Eval( ::bSBlock )
ENDIF
IF ::CalcThumbPos() .AND. nOldThumbPos != ::nThumbPos
DispBegin()
IF ::nOrient == SCROLL_VERTICAL
hb_DispOutAt( ::nStart + nOldThumbPos, ::nOffSet, SubStr( ::cStyle, 2, 1 ), hb_ColorIndex( ::cColorSpec, 0 ) )
hb_DispOutAt( ::nStart + ::nThumbPos, ::nOffset, SubStr( ::cStyle, 3, 1 ), hb_ColorIndex( ::cColorSpec, 1 ) )
ELSE
hb_DispOutAt( ::nOffset, ::nStart + nOldThumbPos, SubStr( ::cStyle, 2, 1 ), hb_ColorIndex( ::cColorSpec, 0 ) )
hb_DispOutAt( ::nOffset, ::nStart + ::nThumbPos, SubStr( ::cStyle, 3, 1 ), hb_ColorIndex( ::cColorSpec, 1 ) )
ENDIF
DispEnd()
RETURN .T.
ENDIF
RETURN .F.
METHOD hitTest( nMRow, nMCol ) CLASS ScrollBar
IF ::nOrient == SCROLL_VERTICAL
DO CASE
CASE nMCol != ::nOffset
CASE nMRow < ::nStart
CASE nMRow > ::nEnd
CASE nMRow == ::nStart
RETURN HTSCROLLUNITDEC
CASE nMRow == ::nEnd
RETURN HTSCROLLUNITINC
CASE nMRow < ::nThumbPos + ::nStart
RETURN HTSCROLLBLOCKDEC
CASE nMRow > ::nThumbPos + ::nStart
RETURN HTSCROLLBLOCKINC
CASE nMRow == ::nThumbPos + ::nStart
RETURN HTSCROLLTHUMBDRAG
ENDCASE
IF nMCol == ::nOffset + 1 .OR. nMCol == ::nOffset
DO CASE
CASE nMCol != ::nOffset .AND. nMCol != ::nOffset + 1
CASE nMRow < ::nStart
CASE nMRow > ::nEnd
CASE nMRow == ::nStart
RETURN HTSCROLLUNITDEC
CASE nMRow == ::nEnd
RETURN HTSCROLLUNITINC
CASE nMRow < ::nThumbPos + ::nStart
RETURN HTSCROLLBLOCKDEC
CASE nMRow > ::nThumbPos + ::nStart
RETURN HTSCROLLBLOCKINC
CASE nMRow == ::nThumbPos + ::nStart
RETURN HTSCROLLTHUMBDRAG
ENDCASE
ENDIF
ELSE
DO CASE
CASE nMRow != ::nOffset
CASE nMCol < ::nStart
CASE nMCol > ::nEnd
CASE nMCol == ::nStart
RETURN HTSCROLLUNITDEC
CASE nMCol == ::nEnd
RETURN HTSCROLLUNITINC
CASE nMCol < ::nThumbPos + ::nStart
RETURN HTSCROLLBLOCKDEC
CASE nMCol > ::nThumbPos + ::nStart
RETURN HTSCROLLBLOCKINC
CASE nMCol == ::nThumbPos + ::nStart
RETURN HTSCROLLTHUMBDRAG
ENDCASE
ENDIF
RETURN HTNOWHERE
METHOD barLength() CLASS ScrollBar
RETURN ::nBarLength
METHOD bitmaps( aBitmaps ) CLASS ScrollBar
IF HB_ISARRAY( aBitmaps ) .AND. ;
Len( aBitmaps ) == 3
::aBitmaps := aBitmaps
ENDIF
RETURN ::aBitmaps
METHOD colorSpec( cColorSpec ) CLASS ScrollBar
IF HB_ISSTRING( cColorSpec ) .AND. ;
! Empty( hb_ColorIndex( cColorSpec, 1 ) ) .AND. ;
Empty( hb_ColorIndex( cColorSpec, 2 ) )
::cColorSpec := cColorSpec
ENDIF
RETURN ::cColorSpec
METHOD current( nCurrent ) CLASS ScrollBar
IF HB_ISNUMERIC( nCurrent ) .AND. ;
nCurrent <= ::nTotal .AND. ;
nCurrent != ::nCurrent
::nCurrent := nCurrent
ENDIF
RETURN ::nCurrent
METHOD end( nEnd ) CLASS ScrollBar
IF HB_ISNUMERIC( nEnd ) .AND. ;
nEnd >= ::nStart .AND. ;
nEnd != ::nEnd
::nEnd := nEnd
::nBarLength := nEnd - ::nStart - 1
ENDIF
RETURN ::nEnd
METHOD offset( nOffset ) CLASS ScrollBar
IF HB_ISNUMERIC( nOffset ) .AND. ;
nOffset != ::nOffset
::nOffset := nOffset
ENDIF
RETURN ::nOffset
METHOD orient( nOrient ) CLASS ScrollBar
IF HB_ISNUMERIC( nOrient ) .AND. ;
( nOrient == SCROLL_VERTICAL .OR. nOrient == SCROLL_HORIZONTAL )
::nOrient := nOrient
ENDIF
RETURN ::nOrient
METHOD sBlock( bSBlock ) CLASS ScrollBar
IF HB_ISEVALITEM( bSBlock )
::bSBlock := bSBlock
ENDIF
RETURN ::bSBlock
METHOD start( nStart ) CLASS ScrollBar
IF HB_ISNUMERIC( nStart ) .AND. ;
nStart <= ::nEnd .AND. ;
nStart != ::nStart
::nStart := nStart
::nBarLength := ::nEnd - nStart - 1
ENDIF
RETURN ::nStart
METHOD style( cStyle ) CLASS ScrollBar
IF HB_ISSTRING( cStyle ) .AND. ;
Len( cStyle ) == 4
::cStyle := cStyle
ENDIF
RETURN ::cStyle
METHOD thumbPos( nThumbPos ) CLASS ScrollBar
IF HB_ISNUMERIC( nThumbPos )
DO CASE
CASE nThumbPos < 1
::nThumbPos := 1
CASE nThumbPos >= ::nBarLength
::nThumbPos := ::nBarLength
CASE nThumbPos >= ::nBarLength - 1
::nThumbPos := nThumbPos
OTHERWISE
::nThumbPos := nThumbPos
ENDCASE
::lOverride := ( nThumbPos != 0 )
ENDIF
RETURN ::nThumbPos
METHOD total( nTotal ) CLASS ScrollBar
IF HB_ISNUMERIC( nTotal ) .AND. ;
nTotal >= 2 .AND. ;
nTotal != ::nTotal
::nTotal := nTotal
ENDIF
RETURN ::nTotal
METHOD CalcThumbPos() CLASS ScrollBar
LOCAL nBarLength := ::nBarLength
LOCAL nTotal := ::nTotal
IF nBarLength < 2 .OR. nTotal < 2
RETURN .F.
ENDIF
IF ! ::lOverride
::nThumbPos := Min( Max( Round( ::nCurrent * ( ( nBarLength - 1 ) / nTotal ) + 1, 0 ), 1 ), nBarLength )
ENDIF
RETURN .T.
/* New definitions for better coding. These are screen codepage dependent,
but can be changed with the setStyle method. */
#define SB_UPARROW Chr( 24 ) /* LOW-ASCII "↑" */
#define SB_DNARROW Chr( 25 ) /* LOW-ASCII "↓" */
#define SB_RIGHTARROW Chr( 27 ) /* LOW-ASCII "→" */
#define SB_LEFTARROW Chr( 26 ) /* LOW-ASCII "←" */
#define SB_THUMB hb_UTF8ToStr( "░" )
#define SB_TRACK hb_UTF8ToStr( "▓" )
METHOD New( nStart, nEnd, nOffset, bSBlock, nOrient ) CLASS ScrollBar
LOCAL cColor
__defaultNIL( @nOrient, SCROLL_VERTICAL )
IF ! HB_ISNUMERIC( nStart ) .OR. ;
! HB_ISNUMERIC( nEnd ) .OR. ;
! HB_ISNUMERIC( nOffset ) .OR. ;
! ValType( bSBlock ) $ "BU" .OR. ;
! HB_ISNUMERIC( nOrient ) .OR. ;
( nOrient != SCROLL_VERTICAL .AND. nOrient != SCROLL_HORIZONTAL )
RETURN NIL
ENDIF
::end := nEnd
::offSet := nOffset
::orient := nOrient
::sBlock := bSBlock
::start := nStart
::nBarLength := nEnd - nStart - 1
SWITCH nOrient
CASE SCROLL_VERTICAL
::cStyle := SB_UPARROW + SB_THUMB + SB_TRACK + SB_DNARROW
::aBitmaps := { "arrow_u.bmu", "arrow_d.bmu", "arrow_e.bmu" }
EXIT
CASE SCROLL_HORIZONTAL
::cStyle := SB_LEFTARROW + SB_THUMB + SB_TRACK + SB_RIGHTARROW
::aBitmaps := { "arrow_l.bmu", "arrow_r.bmu", "arrow_e.bmu" }
EXIT
ENDSWITCH
cColor := SetColor()
::cColorSpec := ;
hb_ColorIndex( cColor, CLR_UNSELECTED ) + "," + ;
hb_ColorIndex( cColor, CLR_ENHANCED )
RETURN Self
FUNCTION ScrollBar( nStart, nEnd, nOffset, bSBlock, nOrient )
RETURN HBScrollBar():New( nStart, nEnd, nOffset, bSBlock, nOrient )
#endif
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