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"{ Package: 'stx:libview2' }"
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ActiveHelp subclass:#FlyByHelp
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instanceVariableNames:'currentFrame currentView currentHelpView showProcess closeProcess'
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classVariableNames:'DelayTime ShowTime TheOneAndOnlyHelpListener'
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poolDictionaries:''
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category:'Interface-Help'
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!
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!FlyByHelp class methodsFor:'initialization'!
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initialize
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"set default delay & help-display times"
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ShowTime := 15.
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DelayTime := 0.25.
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"
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FlyByHelp initialize
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"
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"Modified: 27.4.1996 / 15:07:27 / cg"
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! !
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!FlyByHelp class methodsFor:'start & stop'!
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start
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"start activeHelp for all apps"
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TheOneAndOnlyHelpListener isNil ifTrue:[
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TheOneAndOnlyHelpListener := self new.
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].
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TheOneAndOnlyHelpListener listenForAll
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"
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FlyByHelp start
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FlyByHelp stop
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"
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!
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stop
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"stop activeHelp for all (except for individual apps)"
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TheOneAndOnlyHelpListener notNil ifTrue:[
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TheOneAndOnlyHelpListener unlistenAll.
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TheOneAndOnlyHelpListener := nil.
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].
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"
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FlyByHelp start
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FlyByHelp stop
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"
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! !
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!FlyByHelp methodsFor:'listening'!
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buttonMotion:state x:x y:y view:aView
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aView == currentHelpView ifTrue:[^ self].
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super buttonMotion:state x:x y:y view:aView
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!
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pointerLeave:state view:aView
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aView == currentHelpView ifTrue:[^ self].
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super pointerLeave:state view:aView
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! !
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!FlyByHelp methodsFor:'private'!
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helpTextFromModel:aModel view:aView at:aPointOrNil
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"helper: ask aModel for its helpText."
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|text|
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aPointOrNil notNil ifTrue:[
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(aModel respondsTo:#flyByHelpTextFor:at:) ifTrue:[
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text := aModel flyByHelpTextFor:aView at:aPointOrNil.
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].
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].
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text isNil ifTrue:[
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(aModel respondsTo:#flyByHelpTextFor:) ifTrue:[
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text := aModel flyByHelpTextFor:aView.
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].
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].
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^ text
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!
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helpTextFromView:aView at:aPointOrNil
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"helper: ask aView for its helpText."
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|text|
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aPointOrNil notNil ifTrue:[
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(aView respondsTo:#flyByHelpTextAt:) ifTrue:[
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text := aView flyByHelpTextAt:aPointOrNil.
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].
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].
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text isNil ifTrue:[
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(aView respondsTo:#flyByHelpText) ifTrue:[
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text := aView flyByHelpText.
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].
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].
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^ text.
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!
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hideIfPointerLeft:aView
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"hide help, if the pointer is not in aView"
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|whereOnScreen|
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currentFrame notNil ifTrue:[
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whereOnScreen := aView graphicsDevice pointerPosition.
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(currentFrame notNil
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and:[(currentFrame insetBy:1@1) containsPoint:whereOnScreen]) ifFalse:[
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self hideHelp.
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].
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].
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"Modified: 28.5.1996 / 20:18:28 / cg"
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!
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initiateHelpFor:aView at:aPointOrNil now:showItNow
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"ask aView for helpText, passing x/y coordinates;
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start a timeout process to display this helpText after some delay;
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Normally used internally, but can also be used by widgets to force
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re-negotiation of the displayed helpText
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(for example in a menu, when the selection changes)"
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|text|
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(self interestedIn:aView) ifFalse:[
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^ self
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].
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text := self helpTextFor:aView at:aPointOrNil.
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lastHelpText = text ifTrue:[
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^ self
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].
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text size > 0 ifTrue:[
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(showItNow not and:[DelayTime > 0]) ifTrue:[
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self stopHelpDisplayProcess.
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showProcess := [
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Delay waitForSeconds:DelayTime.
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showProcess := nil.
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self showHelp:text for:aView
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] forkAt:(Processor userSchedulingPriority + 1).
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] ifFalse:[
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self showHelp:text for:aView
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]
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] ifFalse:[
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self hideHelp
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].
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!
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interestedIn:aView
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"return true, if I am interested in aView (either listeningForAll,
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or in my list of apps)"
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aView isNil ifTrue:[^ false].
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aView topView == currentHelpView ifTrue:[^ false].
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^ super interestedIn:aView
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! !
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!FlyByHelp methodsFor:'show / hide help'!
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hideHelp
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"hide the help text"
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|p|
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lastHelpText := nil.
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self stopHelpDisplayProcess.
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currentHelpView notNil ifTrue:[
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[
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currentHelpView destroy.
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currentHelpView := nil.
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currentView := nil.
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] valueUninterruptably
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].
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currentFrame := nil.
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closeProcess notNil ifTrue:[
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p := closeProcess. closeProcess := nil.
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p terminate.
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]
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"Modified: 28.6.1997 / 14:03:50 / cg"
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!
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showHelp:aHelpText for:view
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"show the help text for aView"
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|org p v dev|
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view == currentView ifTrue:[
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lastHelpText = aHelpText ifTrue:[
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^ self
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]
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].
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lastHelpText := aHelpText.
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closeProcess notNil ifTrue:[
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p := closeProcess. closeProcess := nil.
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p terminate.
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].
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currentHelpView notNil ifTrue:[
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self hideHelp
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].
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org := view originRelativeTo:nil.
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currentFrame := org extent:view extent.
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org :=org + (view extent // 2).
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v := ActiveHelpView for:aHelpText withCRs.
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dev := view graphicsDevice.
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org := dev pointerPosition.
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org := org + (0@24).
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(org x + v width) > dev width ifTrue:[
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org := (org x - v width) @ org y
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].
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(org y + v height) > dev height ifTrue:[
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org := org x @ (org y - v height).
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].
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v origin:org.
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"/ currentHelpView open.
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v realize.
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v enableButtonMotionEvents.
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v enableMotionEvents.
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currentHelpView := v.
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currentView := view.
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closeProcess := [
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[
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(Delay forSeconds:ShowTime) wait.
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[
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currentHelpView notNil ifTrue:[
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currentHelpView destroy.
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currentHelpView := nil.
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]
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] valueUninterruptably
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] valueOnUnwindDo:[
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closeProcess := nil.
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].
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] forkAt:(Processor userSchedulingPriority + 1).
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"Modified: 31.8.1995 / 19:20:45 / claus"
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"Modified: 28.6.1997 / 14:45:15 / cg"
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!
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stopHelpDisplayProcess
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|p|
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showProcess notNil ifTrue:[
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p := showProcess. showProcess := nil.
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p terminate.
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].
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"Created: 28.6.1997 / 14:03:17 / cg"
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! !
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!FlyByHelp class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/FlyByHelp.st,v 1.3 2001-12-08 01:25:31 cg Exp $'
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! !
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FlyByHelp initialize!
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