"

 COPYRIGHT (c) 1995 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.

"

View subclass:#ProgressIndicator

	classVariableNames:''

	poolDictionaries:''

	category:'Views-Misc'

!

!ProgressIndicator  class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1995 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 showing a rectangle filled according the percentage value.

    Can be used as a progress indicator a la MSwindows.

    [author:]

        Claus Gittinger

    [see also:]

        ActionWaitBox AnimatedLabel

"

!

examples

"

    basic (internal) interface

    (if progress indicator is to be used in a complex box ...):

    Before you get frustrated - see the convenient-interface examples

    at the end ;-)

                                                                        [exBegin]

      |top p h|

      top := ModalBox new.

      top extent:300@100.

      top label:'Progress'.

      p := ProgressIndicator in:top.

      p origin:(0.0@0.5) corner:(1.0@0.5).

      p level:-1.

      h := p preferredExtent y.

      p topInset:(h // 2) negated; 

        bottomInset:(h // 2) negated;

        leftInset:5;

        rightInset:5.

      [

          1 to:100 do:[:val |

              (Delay forSeconds:0.05) wait.

              p percentage:val 

          ].

          top hide.

      ] fork.

      top open.

                                                                        [exEnd]

    changing colors, turning percentage display off:

                                                                        [exBegin]

      |top p h|

      top := StandardSystemView new.

      top extent:300@100.

      top label:'Progress'.

      p := ProgressIndicator in:top.

      p origin:(0.0@0.5) corner:(1.0@0.5).

      p level:-1.

      p showPercentage:false.

      p foregroundColor:(Color red).

      h := 10.

      p topInset:(h // 2) negated; 

        bottomInset:(h // 2) negated;

        leftInset:5;

        rightInset:5.

      top open.

      [

          1 to:100 do:[:val |

              (Delay forSeconds:0.05) wait.

              p percentage:val 

          ]

      ] fork

                                                                        [exEnd]

    with border (2D look):

                                                                        [exBegin]

      |top p h|

      top := StandardSystemView new.

      top extent:300@100.

      top label:'Progress'.

      p := ProgressIndicator in:top.

      p origin:(0.0@0.5) corner:(1.0@0.5).

      p borderWidth:1.

      h := p preferredExtent y.

      p topInset:(h // 2) negated; 

        bottomInset:(h // 2) negated;

        leftInset:5;

        rightInset:5.

      top open.

      [

          1 to:100 do:[:val |

              (Delay forSeconds:0.05) wait.

              p percentage:val 

          ]

      ] fork

                                                                        [exEnd]

    getting progress from a model:

                                                                        [exBegin]

      |model top p h|

      model := 0 asValue.

      top := StandardSystemView new.

      top extent:300@100.

      top label:'Progress'.

      p := ProgressIndicator in:top.

      p model:model.

      p origin:(0.0@0.5) corner:(1.0@0.5).

      p level:-1.

      h := p preferredExtent y.

      p topInset:(h // 2) negated; 

        bottomInset:(h // 2) negated;

        leftInset:5;

        rightInset:5.

      top open.

      [

          1 to:100 do:[:val |

              (Delay forSeconds:0.05) wait.

              model value:val 

          ]

      ] fork

                                                                        [exEnd]

    concrete example:

      search all files in the source directory for a string

      using grep. Show progress while doing so.

                                                                        [exBegin]

      |top p h names done|

      top := StandardSystemView new.

      top extent:300@100.

      top label:'Searching ...'.

      p := ProgressIndicator in:top.

      p origin:(0.0@0.5) corner:(1.0@0.5).

      p level:-1.

      h := p preferredExtent y.

      p topInset:(h // 2) negated; 

        bottomInset:(h // 2) negated;

        leftInset:5;

        rightInset:5.

      top openWithPriority:(Processor activePriority + 1).

      names := 'source' asFilename directoryContents.

      done := 0.

      names do:[:aName |

        |fn stream line|

        p percentage:(done / names size * 100).

        fn := ('source/' , aName) asFilename.

        fn isDirectory ifFalse:[

            stream := fn readStream.

            [stream atEnd] whileFalse:[

                line := stream nextLine.

                (line findString:'subclass:') ~~ 0 ifTrue:[

                    Transcript showCR:line

                ].

            ].

            stream close.

        ].

        done := done + 1

      ].

      top destroy

                                                                        [exEnd]

   using the convenient inBox-interface

   (this creates a box and an activity label and evaluates a block

    to indicate ...)

    basic interface demonstration:

                                                                        [exBegin]

      |p|

      p := ProgressIndicator 

                inBoxWithLabel:'doing something  ...'

                abortable:true.

      p showProgressOf:

            [:progressValue :currentAction |

              1 to:100 do:[:val |

                  (Delay forSeconds:0.05) wait.

                  val == 25 ifTrue:[

                      currentAction value:'still going ...'

                  ].

                  val == 50 ifTrue:[

                      currentAction value:'halfway through ...'

                  ].

                  val == 75 ifTrue:[

                      currentAction value:'almost finished ...'

                  ].

                  progressValue value:val 

              ]

            ]

                                                                        [exEnd]

    above search example using this convenient interface:

                                                                        [exBegin]

      |p|

      p := ProgressIndicator 

                inBoxWithLabel:'searching files ...'

                abortable:false.

      p showProgressOf:

            [:progressValue :currentAction |

                |names nDone|

                names := 'source' asFilename directoryContents.

                nDone := 0.

                names do:[:aName |

                  |fn stream line|

                  progressValue value:(nDone / names size * 100).

                  currentAction value:'searching ' , 'source/' , aName , ' ...'.

                  fn := ('source/' , aName) asFilename.

                  fn isDirectory ifFalse:[

                      stream := fn readStream.

                      [stream atEnd] whileFalse:[

                          line := stream nextLine.

                          (line findString:'subclass:') ~~ 0 ifTrue:[

                              Transcript showCR:line

                          ].

                      ].

                      stream close.

                  ].

                  nDone := nDone + 1

                ].

            ].

                                                                        [exEnd]

    a nice example: copying files a la windows ...

    the following copies all files to /dev/null.

                                                                        [exBegin]

      |p|

      (ProgressIndicator 

                inBoxWithLabel:'copy files to /dev/null ...'

                abortable:true)

         showProgressOf:

            [:progressValue :currentAction |

                |files nFiles nDone|

                files := '.' asFilename directoryContents.

                nFiles := files size.

                nDone := 0.

                files do:[:aFileName |

                    |percent|

                    nDone := nDone + 1.

                    percent := nDone / nFiles * 100.

                    progressValue value:percent. 

                    aFileName asFilename isDirectory ifTrue:[

                        Transcript showCR:('skipping ' , aFileName , ' ...'). 

                        currentAction value:('skipping ' , aFileName , ' ...'). 

                    ] ifFalse:[

                        Transcript showCR:('copying ' , aFileName , ' ...').

                        currentAction value:('copying ' , aFileName , ' ...').

                        Object errorSignal handle:[:ex |

                            self warn:'an error occurred while copying ' , aFileName.

                            ex return

                        ] do:[

                            aFileName asFilename copyTo:'/dev/null'.

                        ]

                    ].

                ].

            ].

                                                                        [exEnd]

"

! !

!ProgressIndicator  class methodsFor:'instance creation'!

inBox

    ^ self inBoxWithLabel:'executing ...' abortable:false 

!

inBoxWithLabel:aLabel

    "create a topView containing an instance of myself,

     for later use with #showProgressOf:"

    ^ self inBoxWithLabel:aLabel abortable:false 

!

inBoxWithLabel:aLabel abortable:abortable

    "create a topView containing an instance of myself,

     for later use with #showProgressOf:"

    ^ self

        inBoxWithLabel:aLabel   

        text:''

        abortable:abortable

    "Modified: 17.7.1996 / 15:14:58 / cg"

!

    "create a topView containing an instance of myself,

     for later use with #showProgressOf:"

    top := Dialog new.

    top label:aLabel.

    top cursor:(Cursor wait).

    l := top addTextLabel:text.

    l borderWidth:0.

    l adjust:#left.

    l cursor:(Cursor wait).

    top addVerticalSpace.

    p := ProgressIndicator new.

    p extent:(1.0 @ p preferredExtent y).

    p level:-1.

    p leftInset:5;

      rightInset:5.

    p cursor:(Cursor wait).

    p connectToTop:top label:l.

    top addComponent:p.

    abortable ifTrue:[

        top addVerticalSpace.

        top addAbortButton

    ].

    ^ p

    "Created: 17.7.1996 / 15:14:33 / cg"

    "Modified: 17.7.1996 / 15:16:58 / cg"

! !

!ProgressIndicator methodsFor:'accessing'!

foregroundColor:aColor 

    fgColor := aColor

!

percentage:aNumber

    |newPercentage|

    newPercentage := ((aNumber max:0) min:100) rounded.

    newPercentage ~~ percentage ifTrue:[

	percentage := newPercentage.

	shown ifTrue:[self redraw].

    ]

!

showPercentage:aBoolean

    showPercentage := aBoolean

! !

!ProgressIndicator methodsFor:'change & update'!

update:aspect with:aParameter from:changedObject

    (aspect == aspectMsg

    and:[changedObject == model]) ifTrue:[

	self percentage:(model perform:aspectMsg).

	^ self

    ].

    ^ super update:aspect with:aParameter from:changedObject

! !

!ProgressIndicator methodsFor:'drawing'!

redraw

    |s rx sx sy sw m w h|

    m := margin + 1.

    w := width - (m*2).

    h := height - (m*2).

    s := percentage printString , ' %'.

    sw := font widthOf:s.

    sx := (width - sw) // 2.

    sy := height // 2 + font descent + 2.

    rx := (w * percentage / 100) rounded.

    self paint:Color white.