"

 COPYRIGHT (c) 1997 by eXept Software AG 

              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.

"

SelectionInTreeView subclass:#FileSelectionTree

	instanceVariableNames:'fileIcons itemClass'

	classVariableNames:''

	poolDictionaries:''

	category:'Views-Text'

!

!FileSelectionTree class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1997 by eXept Software AG 

              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

"

    somewhat like a FileSelectionInList; but specialized for hierarchical (i.e. tree-like)

    lists and adds the functions to show/hide subtrees. 

    Requires SelectionInTree as model and FileSelectionItem (or compatible) list entries.

    You can define your own TreeItem instead of useing the default class FileSelectionItem

    by seting the class through to #itemClass:

    [see also:]

        FileSelectionItem

        SelectionInTree

        SelectionInTreeView

        SelectionInListView

    [author:]

        Claus Atzkern

"

!

examples

"

    open a FileSelectionTree on current directory

                                                                        [exBegin]

    |top scr|

    top := StandardSystemView new label:'select'; extent:300@500.

    scr := HVScrollableView for:FileSelectionTree origin:(0.0 @ 0.0) corner:(1.0 @ 1.0) in:top.

    scr := scr scrolledView.

    scr directory:Filename currentDirectory.

    scr action:[:anIndex| Transcript showCR:anIndex.

                          Transcript showCR:scr selectedPathname.

               ].

    top open

                                                                        [exEnd]

    open a FileSelectionTree on root path; show directory

                                                                        [exBegin]

    |top scr|

    top := StandardSystemView new label:'select'; extent:300@500.

    scr := HVScrollableView for:FileSelectionTree origin:(0.0 @ 0.0) corner:(1.0 @ 1.0) in:top.

    scr := scr scrolledView.

    scr showDirectoryIndicator:true.

    scr showLines:false.

    scr directory:'/'.

    scr action:[:anIndex| Transcript showCR:anIndex.

                          Transcript showCR:scr selectedPathname.

               ].

    top open

                                                                        [exEnd]

    open a FileSelectionTree on root path; showing only files

                                                                        [exBegin]

    |top scr|

    top := StandardSystemView new label:'select'; extent:300@500.

    scr := HVScrollableView for:FileSelectionTree origin:(0.0 @ 0.0) corner:(1.0 @ 1.0) in:top.

    scr := scr scrolledView.

    scr itemClass:(FileSelectionItem directoriesOnly).

    scr directory:'/'.

    scr action:[:anIndex| Transcript showCR:anIndex.

                          Transcript showCR:scr selectedPathname.

               ].

    top open

                                                                        [exEnd]

    open a FileSelectionTree on a specified path

                                                                        [exBegin]

    |top scr|

    top := StandardSystemView new label:'select'; extent:300@500.

    scr := HVScrollableView for:FileSelectionTree origin:(0.0 @ 0.0) corner:(1.0 @ 1.0) in:top.

    scr := scr scrolledView.

    scr directory:'/'.

    scr showLines:false.

    scr action:[:anIndex| Transcript showCR:scr selectedPathname ].

    scr doubleClickAction:[:anIndex| Transcript showCR:scr selectedPathname ].

    top open

                                                                        [exEnd]

    open a FileSelectionTree on a specified path; show or hide

    lines on doubleClick on a file (not a directory)

                                                                        [exBegin]

    |top scr|

    top := StandardSystemView new label:'select'; extent:300@500.

    scr := HVScrollableView for:FileSelectionTree origin:(0.0 @ 0.0) corner:(1.0 @ 1.0) in:top.

    scr := scr scrolledView.

    scr directory:'/'.

    scr action:[:anIndex| Transcript showCR:anIndex.

                          Transcript showCR:scr selectedPathname.

               ].

    scr doubleClickAction:[:anIndex|

        |fn|

        fn := scr selectedPathname asFilename.

        fn isDirectory ifFalse:[

            scr showLines:(scr showLines not)

        ]

    ].

    top open

                                                                        [exEnd]

    example associated with a FileSelectionList

                                                                        [exBegin]

    |top tree list field label|

    top   := StandardSystemView new label:'select'; extent:600@600.

    tree  := HVScrollableView for:FileSelectionTree origin:(0.0 @ 0.0) corner:(0.5 @ 1.0) in:top.

    list  := HVScrollableView for:FileSelectionList origin:(0.5 @  25) corner:(1.0 @ 1.0) in:top.

    label := Label origin:(0.5 @ 2) in:top.

    label label:'pattern:'.

    field := EditField origin:0.5@2 in:top.

    field leftInset:(label preferredExtent x) + 5.

    field width:1.0.

    field editValue:'*'.

    field crAction:[list pattern:field editValue].

    tree  := tree scrolledView.

    list  := list scrolledView.

    list ignoreDirectories:true.

    list pattern:(field editValue).

    tree itemClass:(FileSelectionItem directoriesOnly).

    tree directory:(Filename homeDirectory).

    tree showDirectoryIndicator:true.

    list directory:(tree directory).

    list action:[:index| Transcript showCR:'you selected: ' , list selectedPathname].

    tree action:[:anIndex|

        list directory:(tree selectedPathname).

    ].

    top open

                                                                        [exEnd]

    a more complex example

                                                                        [exBegin]

        ]

    ].

    top open

                                                                        [exEnd]

"

! !

!FileSelectionTree methodsFor:'accessing'!

directory

    "get the full pathname of the root directory

    "

    |root|

    (root := model root) notNil ifTrue:[

        ^ root pathName

    ].

  ^ nil

!

    "change the root directory of the selection tree to the full pathName,

     is set to nil.

    "

!

itemClass

    "returns current itemClass used

    "

    ^ itemClass

!

itemClass:anItemClass

    "set itemClass to be used

    "

    |directory|

    (anItemClass notNil and:[anItemClass ~~ itemClass]) ifTrue:[

        itemClass := anItemClass.

        self refetchDeviceResources.

        (directory := self directory) notNil ifTrue:[

        ].

    ].

!

pathnameAtIndex:anIndex

    "returns pathname at an index or nil

    "

    |node|

    (node := self nodeAtIndex:anIndex) notNil ifTrue:[

        ^ node pathName

    ].

  ^ nil

! !

!FileSelectionTree methodsFor:'drawing basics'!

figureFor:aNode

    "get the image used for the node entry.

    "

    |keyOrImage|

    aNode == self selectedNode ifFalse:[keyOrImage := aNode imageUnselected]

                                ifTrue:[keyOrImage := aNode imageSelected].

    keyOrImage isSymbol ifTrue:[^ fileIcons at:keyOrImage].

  ^ keyOrImage

! !

!FileSelectionTree methodsFor:'initialization'!

fetchImageResources

    "initialize heavily used device resources - to avoid rendering

     images again and again later; returns maximum extent of the images used.

    "

    |y x t|

    fileIcons := self itemClass iconsOn:device.

    t := super fetchImageResources.

    y := t y.

    x := t x.

    fileIcons do:[:anIcon|

        (t := anIcon heightOn:self) > y ifTrue:[y := t].

        (t := anIcon widthOn:self)  > x ifTrue:[x := t].

    ].

  ^ x @ y

!

initialize

    "setup my model and set the default path to the current directory; on default

     multiple selection is disabled.

    "

    super initialize.

    itemClass := FileSelectionItem.

    self model:(SelectionInTree new).

! !

!FileSelectionTree methodsFor:'selection'!

selectPathname:aPath

    "set selection to a path

    "

    ].

!

selectedPathname

    "if there is a single selection, the full pathname of the selected

     entry will be returned otherwise nil

    "

    |node|

    (node := self selectedNode) notNil ifTrue:[

        ^ node pathName

    ].

  ^ nil

! !

!FileSelectionTree class methodsFor:'documentation'!

version

! !