"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

TextView subclass:#EditTextView

	instanceVariableNames:'cursorLine cursorVisibleLine cursorCol cursorShown

		prevCursorState readOnly modifiedChannel fixedSize exceptionBlock

		cursorFgColor cursorBgColor cursorNoFocusFgColor cursorType

		cursorTypeNoFocus undoAction typeOfSelection lastString

		lastReplacement lastAction replacing showMatchingParenthesis

		hasKeyboardFocus acceptAction lockUpdates tabMeansNextField

		autoIndent insertMode trimBlankLines wordWrap

		replacementWordSelectStyle acceptChannel acceptEnabled'

	classVariableNames:'DefaultCursorForegroundColor DefaultCursorBackgroundColor

		DefaultCursorType DefaultCursorNoFocusForegroundColor ST80Mode'

	poolDictionaries:''

	category:'Views-Text'

!

!EditTextView class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    a view for editable text - adds editing functionality to TextView

    Also, it adds accept functionality, and defines a new actionBlock: 

    acceptAction to be performed for accept

    If used with a model, this is informed by sending it a changeMsg with

    the current contents as argument.

    (however, it is possible to define both changeMsg and acceptAction)

    Please read the historic notice in the ListView class.

    [Instance variables:]

        cursorLine              <Number>        line where cursor sits (1..)

        cursorVisibleLine       <Number>        visible line where cursor sits (1..nLinesShown)

        cursorCol               <Number>        col where cursor sits (1..)

        cursorShown             <Boolean>       true, if cursor is currently shown

        readOnly                <Boolean>       true, if text may not be edited

        modifiedChannel         <ValueHolder>   holding true, if text has been modified.

                                                cleared on accept.

        acceptChannel           <ValueHolder>   holding true, if text has been accepted.

        fixedSize               <Boolean>       true, if no lines may be added/removed

        exceptionBlock          <Block>         block to be evaluated when readonly text is about to be modified

                                                if it returns true, the modification will be done anyway.

                                                if it returns anything else, the modification is not done.

        cursorFgColor           <Color>         color used for cursor drawing

        cursorBgColor           <Color>         color used for cursor drawing

        cursorType              <Symbol>        how the cursor is drawn; currently implemented

                                                are #block (solid-block cursor), #ibeam

                                                (vertical bar at insertion point) 

                                                and #caret (caret below insertion-point)

	cursorTypeNoFocus	<Symbol>	like above, if view has no focus

						nil means: hide the cursor.

        undoAction              <Block>         block which undoes last cut, paste or replace

                                                (not yet fully implemented)

        typeOfSelection         <Symbol>        #paste, if selection created by paste, nil otherwise

                                                this affects the next keyPress: if #paste it does not

                                                replace; otherwise it replaces the selection.

        lastCut                 <String>        last cut or replaced string

        lastReplacement         <String>        last replacement

        replacing               <Boolean>       true if entered characters replace last selection

        showMatchingParenthesis <Boolean>       if true, shows matching parenthesis

                                                when entering one; this is the default.

        hasKeyboardFocus        <Boolean>       true if this view has the focus

        acceptAction            <Block>         accept action - evaluated passing the contents as 

                                                argument 

        tabMeansNextField       <Boolean>       if true, Tab is ignored as input and shifts keyboard

                                                focus to the next field. For editTextViews, this is false

                                                by default (i.e. tabs can be entered into the text).

                                                For some subclasses (inputFields), this may be true.

        trimBlankLines          <Boolean>       if true, trailing blanks are

                                                removed when editing.

                                                Default is true.

        wordWrap                <Boolean>       Currently not used.

        lockUpdates             <Boolean>       internal, private

        prevCursorState         <Boolean>       temporary, private

    class variables:

        ST80Mode                <Boolean>       if true, cursor positioning is

                                                done as in vi or ST80; i.e.

                                                wysiwyg mode is somewhat relaxed,

                                                in that the cursor cannot be

                                                positioned behind a lines end.

                                                This is not yet completely implemented.

    used globals:

        DeleteHistory           <Text>          last 1000 lines of deleted text

                                                (but only if this variable exists already)

    [styleSheet parameters:]

        textCursorForegroundColor <Color>       cursor fg color; default: text background

        textCursorBackgroundColor <Color>       cursor bg color; default: text foreground

        textCursorNoFocusForegroundColor 

                                  <Color>       cursor fg color if no focus; default: cursor fg color

        textCursorType            <Symbol>      cursor type; default:  #block

    [author:]

        Claus Gittinger

    [see also:]

        CodeView Workspace TextView ListView

        EditField

"

!

examples

"

  non MVC operation:

    basic setup:

                                                                        [exBegin]

        |top textView|

        top := StandardSystemView new.

        top extent:300@200.

        textView := EditTextView new.

        textView origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top addSubView:textView.

        textView contents:('/etc/hosts' asFilename contentsOfEntireFile).

        top open.

                                                                        [exEnd]

    with vertical scrollbar:

                                                                        [exBegin]

        |top scrollView textView|

        top := StandardSystemView new.

        top extent:300@200.

        scrollView := ScrollableView for:EditTextView.

        textView := scrollView scrolledView.

        scrollView origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top addSubView:scrollView.

        textView contents:('/etc/hosts' asFilename contentsOfEntireFile).

        top open.

                                                                        [exEnd]

    with horizontal & vertical scrollbars:

                                                                        [exBegin]

        |top scrollView textView|

        top := StandardSystemView new.

        top extent:300@200.

        scrollView := HVScrollableView for:EditTextView.

        textView := scrollView scrolledView.

        scrollView origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top addSubView:scrollView.

        textView contents:('/etc/hosts' asFilename contentsOfEntireFile).

        top open.

                                                                        [exEnd]

    set the action for accept:

                                                                        [exBegin]

        |top textView|

        top := StandardSystemView new.

        top extent:300@200.

        textView := EditTextView new.

        textView origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top addSubView:textView.

        textView contents:('/etc/hosts' asFilename contentsOfEntireFile).

        textView acceptAction:[:contents |

                                Transcript showCR:'will not overwrite the file with:'.

                                Transcript showCR:contents asString

                              ].

        top open.

                                                                        [exEnd]

    non-string (text) items:

                                                                        [exBegin]

        |top textView list|

        list := '/etc/hosts' asFilename contentsOfEntireFile asStringCollection.

        1 to:list size by:2 do:[:nr |

            list at:nr put:(Text string:(list at:nr)

                                 emphasis:(Array with:#bold with:(#color->Color red)))

        ].

        top := StandardSystemView new.

        top extent:300@200.

        textView := EditTextView new.

        textView origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top addSubView:textView.

        textView contents:list.

        top open.

                                                                        [exEnd]

  MVC operation:

    (the examples model here is a plug simulating a real model;

     real world applications would not use a plug ..)

                                                                        [exBegin]

        |top textView model|

        model := Plug new.

        model respondTo:#accepted:

                   with:[:newContents | 

                                Transcript showCR:'will not overwrite the file with:'.

                                Transcript showCR:newContents asString

                        ].

        model respondTo:#getList

                   with:['/etc/hosts' asFilename contentsOfEntireFile].

        top := StandardSystemView new.

        top extent:300@200.

        textView := EditTextView new.

        textView origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top addSubView:textView.

        textView listMessage:#getList;

                 model:model;

                 changeMessage:#accepted:;

                 aspect:#list.

        top open.

                                                                        [exEnd]

    two textViews on the same model:

                                                                        [exBegin]

        |top1 textView1 top2 textView2 model currentContents|

        model := Plug new.

        model respondTo:#accepted:

                   with:[:newContents |

                                Transcript showCR:'accepted:'.

                                Transcript showCR:newContents asString.

                                currentContents := newContents.

                                model changed:#contents

                        ].

        model respondTo:#getList

                   with:[Transcript showCR:'query'.

                         currentContents].

        top1 := StandardSystemView new.

        top1 extent:300@200.

        textView1 := EditTextView new.

        textView1 origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top1 addSubView:textView1.

        textView1 listMessage:#getList;

                  model:model;

                  aspect:#contents;

                  changeMessage:#accepted:.

        top1 open.

        top2 := StandardSystemView new.

        top2 extent:300@200.

        textView2 := EditTextView new.

        textView2 origin:0.0 @ 0.0 corner:1.0 @ 1.0.

        top2 addSubView:textView2.

        textView2 listMessage:#getList;

                  model:model;

                  aspect:#contents;

                  changeMessage:#accepted:.

        top2 open.

                                                                        [exEnd]

"

! !

!EditTextView class methodsFor:'defaults'!

updateStyleCache

    "extract values from the styleSheet and cache them in class variables"

    ST80Mode := false.

! !

!EditTextView methodsFor:'ST-80 compatibility editing'!

insert:aString at:aCharacterPosition

    "insert a string at aCharacterPosition."

    |line col|

    line := self lineOfCharacterPosition:aCharacterPosition.

    col := aCharacterPosition - (self characterPositionOfLine:line col:1) + 1.

    self insertString:aString atLine:line col:col.

    "

     |top v|

     top := StandardSystemView new.

     top extent:300@300.

     v := EditTextView origin:0.0@0.0 corner:1.0@1.0 in:top.

     top openAndWait.

     v contents:'1234567890\1234567890\1234567890\' withCRs.

     v insert:'<- hello there' at:5.

    "

    "Modified: 2.8.1997 / 19:10:09 / cg"

!

insertAndSelect:aString at:aCharacterPosition

    "insert a selected string at aCharacterPosition."

    |line col|

    line := self lineOfCharacterPosition:aCharacterPosition.

    col := aCharacterPosition - (self characterPositionOfLine:line col:1) + 1.

    self insertString:aString atLine:line col:col.

    self selectFromLine:line col:col toLine:line col:col + aString size - 1

    "

     |v|

     v := EditTextView new openAndWait.

     v contents:'1234567890\1234567890\1234567890\' withCRs.

     v insertAndSelect:'<- hello there' at:5.

    "

! !

!EditTextView methodsFor:'accessing-behavior'!

acceptAction

    "return the action to be performed on accept (or nil)"

    ^ acceptAction

!

acceptAction:aBlock

    "set the action to be performed on accept"

    acceptAction := aBlock

!

acceptEnabled:aBoolean

    "enable/disable accept. This greys the corresponding item in the menu"

    acceptEnabled := aBoolean

    "Created: 7.3.1997 / 11:04:34 / cg"

!

autoIndent:aBoolean

    autoIndent := aBoolean

    "Created: 5.3.1996 / 14:37:50 / cg"

!

exceptionBlock:aBlock

    "define the action to be triggered when user tries to modify

     readonly text"

    exceptionBlock := aBlock

!

insertMode:aBoolean

    insertMode := aBoolean

    "Created: 6.3.1996 / 12:24:05 / cg"

!

tabMeansNextField:aBoolean

    "set/clear tabbing to the next field.

     If true, Tab is ignored and shifts the keyboard focus.

     If false, tabs can be entered into the text.

     The default is true for editTextView, false for single-line

     input fields."

    tabMeansNextField := aBoolean

! !

!EditTextView methodsFor:'accessing-contents'!

acceptChannel

    "return the valueHolder holding true if text was accepted"

    ^ acceptChannel

    "Modified: 14.2.1997 / 16:44:18 / cg"

!

accepted

    "return true if text was accepted"

    ^ acceptChannel value

    "Created: 14.2.1997 / 16:43:46 / cg"

!

accepted:aBoolean

    "set/clear the accepted flag"

    acceptChannel value:aBoolean

    "Created: 14.2.1997 / 16:44:01 / cg"

!

at:lineNr put:aLine

    (self at:lineNr) = aLine ifFalse:[

        super at:lineNr put:aLine.

        self textChanged

    ].

!

characterUnderCursor

    "return the character under the cursor - space if behond line.

     For non-block cursors, this is the character immediately to the right

     of the insertion-bar or caret."

    ^ self characterAtLine:cursorLine col:cursorCol

!