"
 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.
"

WarningBox subclass:#YesNoBox
	instanceVariableNames:''
	classVariableNames:'RequestBitmap'
	poolDictionaries:''
	category:'Views-DialogBoxes'
!

!YesNoBox 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
"
   Historic note:
        originally, ST/X had separate classes for the various entry methods;
        there were YesNoBox, EnterBox, InfoBox and so on.
        In the meantime, the DialogBox class (and therefore its alias: Dialog)
        is going to duplicate most funcionality found in these classes.

        In the future, those existing subclasses' functionality is going to
        be moved fully into Dialog, and the subclasses will be replaced by dummy
        delegators. (They will be kept for backward compatibility, though).



    this class implements yes-no boxes by adding another (no-) Button to the WarnBox-View.
    They are created with:

        aBox := YesNoBox title:'some title'.
        aBox okAction:[ .. some action to be performed when ok is pressed ].

    and finally shown with:

        aBox showAtPointer

    The default box shows 'yes' and 'no' in its buttons; this can be changed with:

        aBox yesText:'some string'.
        aBox noText:'some string'.

    There is also protocol to set both button titles in one message.
    Also, the action associated to the noButton can be changed.

    For very simple yes/no queries, you can also use the much simpler confirm:.
    Since implemented in Object, everyone understands confirm. You can pass
    a question message (but not change the buttons labels).
    Use is:
        self confirm:'some question'  
    and will return true or false.

    For compatibility with ST-80, use:
        Dialog confirm:'hello'

    [see also:]
        DialogBox
        EnterBox

    [author:]
        Claus Gittinger

"
!

examples
"
    Examples:
                                                                        [exBegin]
        |aBox|

        aBox := YesNoBox title:'Coffee or tee ?'.
        aBox noText:'tee'.
        aBox yesText:'coffee'.
        aBox yesAction:[Transcript showCR:'make coffee'].
        aBox noAction:[Transcript showCR:'make tee'].
        aBox showAtPointer.
                                                                        [exEnd]
    or, shorter:
                                                                        [exBegin]
        |aBox|

        aBox := YesNoBox new.
        aBox title:'Coffee or Tee ?' 
             yesAction:[Transcript showCR:'make coffee']
             noAction:[Transcript showCR:'make tee'].
        aBox yesText:'Coffee' noText:'Tee'.
        aBox showAtPointer
                                                                        [exEnd]

    Also, have a look at the inherited protocol; for example, this allows changing
    the bitmap (default: a question mark) and other properties.

    If the box is needed to ask for a simple boolean, you can also use the
    #confirm method, to bring up a box, let it ask for something and return
    true or false. 
    Example:
                                                                        [exBegin]
        |box value|

        box := YesNoBox new.
        value := box confirm:'yes or no:'.
        value ifTrue:[
            Transcript showCR:'yes'
        ] ifFalse:[
            Transcript showCR:'no'
        ]
                                                                        [exEnd]

    of course, this can also be written shorter as:
                                                                        [exBegin]
        (YesNoBox new confirm:'yes or no:') ifTrue:[
            Transcript showCR:'yes'
        ] ifFalse:[
            Transcript showCR:'no'
        ]
                                                                        [exEnd]
    or:
                                                                        [exBegin]
        (Dialog confirm:'yes or no:') ifTrue:[
            Transcript showCR:'yes'
        ] ifFalse:[
            Transcript showCR:'no'
        ]
                                                                        [exEnd]
"
! !

!YesNoBox class methodsFor:'instance creation'!

title:t yesText:yesString noText:noString
    "return a new YesNoBox with title, and buttonLabels yesString/noString"

    ^ (self new) title:t yesText:yesString noText:noString

    "Modified: 23.4.1996 / 00:12:48 / cg"
! !

!YesNoBox class methodsFor:'icon bitmap'!

iconBitmap
    "return the bitmap shown as icon in my instances"

    RequestBitmap isNil ifTrue:[
	RequestBitmap := Image fromFile:'bitmaps/Request.xbm'. 
	RequestBitmap notNil ifTrue:[
	    RequestBitmap := RequestBitmap on:Display 
	].
    ].
    ^ RequestBitmap
! !

!YesNoBox class methodsFor:'styles'!

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

    <resource: #style (#requestBoxIcon)>

    |img|

    img := StyleSheet at:'requestBoxIcon'.
    img notNil ifTrue:[RequestBitmap := img on:Display].

    "Modified: 1.3.1996 / 13:52:18 / cg"
! !

!YesNoBox methodsFor:'accessing'!

noAction:aBlock
    "define the action to be performed when no is pressed"

    abortAction := aBlock
!

noButton
    "return the no-button"

    ^ abortButton
!

noLabel:aString
    "define the label of the no-button"

    self noText:aString.

    "Created: 13.12.1995 / 16:21:57 / cg"
!

noText:aString
    "define the label of the no-button"

    aString ~= abortButton label ifTrue:[
	abortButton label:aString.
	abortButton resize.
	shown ifTrue:[self resize]
    ]
!

okText:yesString noText:noString
    "define the labels of both buttons - same as yesText:noText"

    ^ self yesText:yesString noText:noString
!

title:aString yesAction:yesBlock noAction:noBlock
    "define title and actions"

    self title:aString.
    okAction := yesBlock.
    abortAction := noBlock
!

title:aString yesText:yesString noText:noString
    "define title and button labels"

    self title:aString.
    self yesText:yesString noText:noString
!

yesAction:aBlock 
    "define the action to be performed when yes is pressed"

    okAction := aBlock
!

yesAction:yesBlock noAction:noBlock
    "define both actions"

    okAction := yesBlock.
    abortAction := noBlock
!

yesButton
    "return the yes-button"

    ^ okButton
!

yesLabel:aString
    "define the label of the yes-button"

    self yesText:aString.

    "Created: 13.12.1995 / 16:22:05 / cg"
!

yesText:aString
    "define the label of the yes-button"

    self okText:aString
!

yesText:yesString noText:noString
    "define the labels of both buttons"

    ((yesString ~= okButton label) or:[noString ~= abortButton label]) ifTrue:[
        okButton label:yesString. 
        abortButton label:noString.
        okButton resize.
        abortButton resize.
        shown ifTrue:[self resize]
    ]

    "Modified: 21.2.1996 / 00:58:38 / cg"
! !

!YesNoBox methodsFor:'initialization'!

initialize
    super initialize.

    label := resources string:'Choose'.

    buttonPanel horizontalLayout:#fitSpace.  "/ looks better; should it come from the StyleSheet ?

    textLabel label:'please Confirm'.
    okButton label:(resources at:'yes').

    abortButton := Button abortButton.
    buttonPanel addSubView:abortButton before:okButton.
    abortButton label:(resources at:'no').
    abortButton height:(okButton height).
    abortButton model:self; change:#noPressed

    "Modified: 28.10.1996 / 09:57:36 / cg"
! !

!YesNoBox methodsFor:'queries'!

preferredExtent 
    "compute the boxes preferredExtent from the components' sizes"

    |w h max mm|

    "/ If I have an explicit preferredExtent ..

    preferredExtent notNil ifTrue:[
        ^ preferredExtent
    ].

    mm := ViewSpacing.

    "
     make the two buttons of equal size
    "
    max := okButton preferredExtent x max:abortButton preferredExtent x.
    okButton width:max.
    abortButton width:max.

    w := (formLabel width + textLabel width) max:max * 2.
    w := w + (3 * mm) + (okButton borderWidth + abortButton borderWidth * 2).
    h := (mm * 5)
         + ((formLabel height) max:(textLabel height))
         + okButton heightIncludingBorder.

    ^ (w @ h).

    "Modified: 19.7.1996 / 20:45:53 / cg"
! !

!YesNoBox methodsFor:'startup'!

confirm
    "open the receiver and return true for yes, false for no.
     This is an easier interface to use, since no action blocks
     have to be defined. The title is used as previously defined."

    self yesAction:[^ true] noAction:[^ false].
    self showAtPointer.
    self yesAction:nil noAction:nil. "/ clear actions for earlier release of context

    "
     YesNoBox new confirm
    "
!

confirm:aString
    "open the receiver and return true for yes, false for no.
     This is an easier interface to use, since no action blocks
     have to be defined."

    self title:aString.
    ^ self confirm

    "
     YesNoBox new confirm:'really ?'
     YesNoBox confirm:'really ?'
     self confirm:'really ?'

    for ST-80 compatibility, you should use Dialogs confirm
    (which simply forwards the request to the YesNoBox anyway):

     Dialog confirm:'really ?'    
    "

    "Modified: 13.12.1995 / 16:20:01 / cg"
! !

!YesNoBox methodsFor:'user interaction'!

noPressed
    "user pressed the no-button;
     hide myself and evaluate the action"

    abortButton turnOffWithoutRedraw.
    self hideAndEvaluate:abortAction
! !

!YesNoBox class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libwidg/YesNoBox.st,v 1.33 1996-10-28 08:58:17 cg Exp $'
! !