author | Jan Vrany <jan.vrany@fit.cvut.cz> |
Wed, 17 Jun 2015 06:22:00 +0100 | |
branch | jv |
changeset 18487 | 8735bd9eee2f |
parent 18120 | e3a375d5f6a8 |
child 18680 | 79953362f1ca |
permissions | -rw-r--r-- |
17598 | 1 |
"{ Encoding: utf8 }" |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libbasic' }" |
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"{ NameSpace: Smalltalk }" |
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GenericException subclass:#Notification |
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instanceVariableNames:'tag' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Kernel-Exceptions' |
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! |
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!Notification class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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|
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! |
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documentation |
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" |
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12277 | 44 |
Notification is the superclass of all notification signals in the system. |
11200 | 45 |
contrast to regular exceptions, Notifications are ignored, if no handler is present |
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and a default value is returned from the raise. |
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When a handler finishes, the do-block is proceeded with the exception handler's value |
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(an Exception does a return in this case.). |
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Thanks to proceedable exceptions, Notifications allow for non-GUI model code to provide |
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user notifications which are optionally shown. |
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Very useful, for example to provide progress information from a method which can be |
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invoked both from a GUI-Tool (where notifications are wanted) and also from the system, |
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where such notifications are not desired. |
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[author:] |
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Stefan Vogel |
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[see also:] |
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15668 | 60 |
Signal QuerySignal Query |
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" |
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! |
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examples |
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" |
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an up-notification from a deeply nested operation to a higher level: |
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[exBegin] |
68 |
|zero| |
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zero := 0. |
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Notification handle:[:n | |
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Transcript showCR:'Please note that: ' , n description. |
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n proceedWith:true |
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] do:[ |
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'nesting'. |
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[ |
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[ |
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Error handle:[:ex | |
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Transcript showCR:'some error: ' , ex errorString. |
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ex proceed |
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] do:[ |
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[ |
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1 // zero. 'an error which is caught in the handler'. |
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Notification notify:'hello world' |
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] value |
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] |
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] value |
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] value |
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] |
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[exEnd] |
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" |
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! ! |
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93 |
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!Notification class methodsFor:'initialization'! |
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initialize |
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NotifierString := 'Notification:' |
99 |
! ! |
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!Notification class methodsFor:'answering queries'! |
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answer:someAnswer do:aBlock |
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"evaluate the argument, aBlock. |
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12060 | 105 |
If the receiver is queried during evaluation, answer and proceed with someAnswer. |
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This is a wrapper for #handle:do: for lazy typists; no new functionality." |
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<context: #return> |
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<exception: #handle> |
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"/ thisContext markForHandle. -- same as above pragma |
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^ aBlock value. "the real logic is in Exception>>doRaise" |
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" |
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Notification answer:true do:[ |
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Transcript showCR:'query answers: ' , (Query query printString). |
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] |
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" |
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" |
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Notification answer:false do:[ |
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Transcript showCR:'first query answers: ' , (Query query printString). |
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Query answer:true do:[ |
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Transcript showCR:'second query answers: ' , (Query query printString). |
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] |
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] |
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" |
128 |
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"Created: / 10.7.1996 / 15:08:20 / cg" |
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"Modified: / 14.10.1996 / 16:59:18 / cg" |
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"Modified: / 25.7.1999 / 23:12:19 / stefan" |
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! ! |
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!Notification class methodsFor:'misc ui support'! |
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iconInBrowserSymbol |
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<resource: #programImage> |
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^ #notificationClassBrowserIcon |
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! ! |
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!Notification class methodsFor:'queries'! |
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accepts:aSignal |
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"return true, if the receiver accepts the argument, aSignal. |
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(i.e. the receiver is aSignal or a parent of it). False otherwise." |
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|s| |
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self == aSignal ifTrue:[^ true]. |
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aSignal isQuerySignal ifFalse:[^ false]. |
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s := aSignal parent. |
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[s notNil] whileTrue:[ |
155 |
self == s ifTrue:[^ true]. |
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156 |
s := s parent |
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]. |
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^ false |
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"Modified: / 22.3.1999 / 12:45:32 / stefan" |
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"Created: / 23.7.1999 / 15:18:00 / stefan" |
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! |
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defaultAnswer |
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"Return the default answer to the Query. This method is called, |
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if nobody catches the signal. |
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Subclasses may redefine this method." |
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"Calling raiseRequest here will execute the exception's action method" |
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^ super raiseRequest |
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"Created: / 23.7.1999 / 15:16:03 / stefan" |
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! |
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handlerForSignal:signal context:theContext originator:originator |
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"answer the handler block for the signal from originator. |
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The block is retrieved from aContext. |
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Answer nil if the signal is not handled" |
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|arg| |
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theContext selector == #'answer:do:' ifTrue:[ |
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(self == signal or:[self accepts:signal]) ifTrue:[ |
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arg := theContext argAt:1. |
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187 |
^ [:ex| ex proceedWith:arg]. |
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] |
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] ifFalse:[ |
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^ super handlerForSignal:signal context:theContext originator:originator. |
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]. |
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192 |
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^ nil |
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"Created: / 25.7.1999 / 23:11:55 / stefan" |
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! |
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197 |
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handles:anException |
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"return true, if the receiver handles the argument, anException. |
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(i.e. the receiver is anExceptions signal or a parent of it)" |
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|
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|signal| |
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signal := anException creator. |
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self == signal ifTrue:[^ true]. "quick check" |
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anException isNotification ifFalse:[^ false]. "speed up non-queries by not traversing the parent chain" |
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|
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[(signal := signal parent) notNil] whileTrue:[ |
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self == signal ifTrue:[^ true]. |
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]. |
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^ false |
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! |
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isQuerySignal |
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"return true, if this is a querySignal - always return true here" |
4550 | 217 |
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218 |
^ true |
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219 |
||
220 |
"Created: / 23.7.1999 / 14:59:50 / stefan" |
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221 |
! |
|
222 |
||
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notify:aMessageString |
15680 | 224 |
"raise the query - return the handler's value, or the default |
6431 | 225 |
value, if there is no handler." |
226 |
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16283 | 227 |
"/ cg: must be redefined, so we get a reasonable originator |
228 |
"/ some apps depend on aoriginator being the non-exception context here. |
|
229 |
"/ (do not do a self raiseRequestErrorString: here) |
|
230 |
^ self basicNew |
|
231 |
raiseRequestErrorString:aMessageString in:thisContext sender |
|
6431 | 232 |
! |
233 |
||
4550 | 234 |
query |
15680 | 235 |
"raise the query - return the handler's value, or the default |
4550 | 236 |
value, if there is no handler. |
237 |
Invoking the handler is exactly the functionality of Signal>>raiseRequest, |
|
8778 | 238 |
but we can do it faster here (avoiding the construction of an exception instance)." |
4550 | 239 |
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240 |
|con signal| |
4550 | 241 |
|
242 |
con := Context findFirstSpecialHandle:true raise:false. |
|
243 |
[con notNil] whileTrue:[ |
|
17598 | 244 |
(con selector == #answer:do:) ifTrue:[ |
245 |
signal := con receiver. |
|
246 |
signal == self ifTrue:[ |
|
247 |
^ con argAt:1 |
|
248 |
]. |
|
249 |
signal isNil ifTrue:[ |
|
250 |
self error:'nil receiver in #answer:do: - send'. |
|
251 |
]. |
|
252 |
(signal accepts:self) ifTrue:[ |
|
253 |
^ con argAt:1 |
|
254 |
]. |
|
255 |
] ifFalse:[ |
|
256 |
"ask the the receiver of the #handle:do: or #on:do: or whatever- message for the handler. |
|
257 |
nil is returned, if the signal is not accepted" |
|
258 |
|r| |
|
259 |
r := con receiver. "receiver of #handle:do: or #on:do:" |
|
260 |
(r notNil and:[(r handlerForSignal:self |
|
261 |
context:con |
|
262 |
originator:thisContext sender homeReceiver) notNil] |
|
263 |
) ifTrue:[ |
|
264 |
"there is another handler block, maybe it will return the answer. |
|
265 |
Call it via raiseRequest" |
|
266 |
^ super raiseRequest |
|
267 |
]. |
|
4550 | 268 |
]. |
269 |
con := con findSpecialHandle:true raise:false. |
|
270 |
]. |
|
271 |
||
272 |
"/ no handler found - return the default value |
|
273 |
^ self defaultAnswer |
|
274 |
||
17598 | 275 |
"Modified: / 15-06-1998 / 21:27:37 / cg" |
276 |
"Modified: / 25-07-1999 / 23:15:16 / stefan" |
|
277 |
"Modified: / 11-03-2015 / 11:26:45 / sr" |
|
4550 | 278 |
! |
279 |
||
280 |
raise |
|
15849 | 281 |
"Notifications are proceedable by definition, |
4550 | 282 |
so they should be raised with #query or #raiseRequest" |
283 |
||
284 |
^ self shouldNotImplement |
|
285 |
||
286 |
"Created: / 23.7.1999 / 15:19:17 / stefan" |
|
287 |
! |
|
288 |
||
289 |
raiseRequest |
|
290 |
"redefined to use #query" |
|
291 |
||
292 |
^ self query |
|
293 |
||
294 |
"Created: / 25.7.1999 / 23:25:59 / stefan" |
|
4443 | 295 |
! ! |
296 |
||
15849 | 297 |
!Notification class methodsFor:'utilities'! |
298 |
||
299 |
deprecated |
|
300 |
"invoked by some open source packages (SOAP and YAXO, for example)" |
|
301 |
||
302 |
self notify:'called deprecated interface' |
|
303 |
! ! |
|
304 |
||
13674 | 305 |
!Notification methodsFor:'accessing'! |
306 |
||
307 |
tag |
|
308 |
"for squeak compatibility" |
|
309 |
||
310 |
^ tag |
|
311 |
||
312 |
"Modified (comment): / 11-09-2011 / 16:40:54 / cg" |
|
313 |
! |
|
314 |
||
315 |
tag:aSzmbol |
|
316 |
"for squeak compatibility" |
|
317 |
||
318 |
tag := aSzmbol. |
|
319 |
||
320 |
"Modified (format): / 11-09-2011 / 16:41:01 / cg" |
|
321 |
! ! |
|
322 |
||
4443 | 323 |
!Notification methodsFor:'default actions'! |
324 |
||
4525 | 325 |
defaultAction |
4550 | 326 |
"the default action is to return the default value. |
327 |
Subclasses may redefine this" |
|
4443 | 328 |
|
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329 |
|handlerBlock| |
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QuerySignal generates Notifications instead of Exceptions.
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330 |
|
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|
331 |
"try per signal handler. |
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|
332 |
I may have been created from a QuerySignal" |
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|
333 |
|
15285 | 334 |
(handlerBlock := self creator handlerBlock) notNil ifTrue:[ |
8683
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QuerySignal generates Notifications instead of Exceptions.
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|
335 |
"... and call it" |
a162510a0408
QuerySignal generates Notifications instead of Exceptions.
Stefan Vogel <sv@exept.de>
parents:
8681
diff
changeset
|
336 |
^ handlerBlock value:self. |
a162510a0408
QuerySignal generates Notifications instead of Exceptions.
Stefan Vogel <sv@exept.de>
parents:
8681
diff
changeset
|
337 |
]. |
6451
f22b12c0349a
renamed #defaultValue -> #defaultResumeValue (vw54 compat.)
Claus Gittinger <cg@exept.de>
parents:
6431
diff
changeset
|
338 |
^ self defaultResumeValue |
4443 | 339 |
|
4550 | 340 |
"Modified: / 23.7.1999 / 15:13:34 / stefan" |
4443 | 341 |
! ! |
342 |
||
14948 | 343 |
!Notification methodsFor:'helpers'! |
344 |
||
345 |
hasDialog |
|
346 |
"answer true, if we can use a Dialog window" |
|
347 |
||
348 |
(Smalltalk isInitialized |
|
349 |
and:[Dialog notNil |
|
350 |
and:[Screen notNil |
|
351 |
and:[Screen current notNil |
|
352 |
and:[Screen current isOpenAndDispatching |
|
353 |
]]]]) ifTrue:[ |
|
354 |
Dialog autoload. "in case its autoloaded" |
|
355 |
^ true. |
|
356 |
]. |
|
357 |
^ false |
|
358 |
! ! |
|
359 |
||
12042 | 360 |
!Notification methodsFor:'queries'! |
361 |
||
362 |
query |
|
363 |
"notice the implementation on the class-side: if no additional parameters are to be passed, |
|
364 |
we do not even arrive here, because query has inlined the raiseRequest code" |
|
365 |
||
366 |
^ self raiseRequest |
|
367 |
! ! |
|
368 |
||
8681
38aa963476a5
Support for Block>>#on:do:on:do:
Stefan Vogel <sv@exept.de>
parents:
8516
diff
changeset
|
369 |
!Notification methodsFor:'testing'! |
38aa963476a5
Support for Block>>#on:do:on:do:
Stefan Vogel <sv@exept.de>
parents:
8516
diff
changeset
|
370 |
|
38aa963476a5
Support for Block>>#on:do:on:do:
Stefan Vogel <sv@exept.de>
parents:
8516
diff
changeset
|
371 |
isNotification |
38aa963476a5
Support for Block>>#on:do:on:do:
Stefan Vogel <sv@exept.de>
parents:
8516
diff
changeset
|
372 |
^ true |
38aa963476a5
Support for Block>>#on:do:on:do:
Stefan Vogel <sv@exept.de>
parents:
8516
diff
changeset
|
373 |
! ! |
38aa963476a5
Support for Block>>#on:do:on:do:
Stefan Vogel <sv@exept.de>
parents:
8516
diff
changeset
|
374 |
|
4443 | 375 |
!Notification class methodsFor:'documentation'! |
376 |
||
377 |
version |
|
17598 | 378 |
^ '$Header: /cvs/stx/stx/libbasic/Notification.st,v 1.35 2015-03-11 10:27:53 sr Exp $' |
12042 | 379 |
! |
380 |
||
381 |
version_CVS |
|
17598 | 382 |
^ '$Header: /cvs/stx/stx/libbasic/Notification.st,v 1.35 2015-03-11 10:27:53 sr Exp $' |
4443 | 383 |
! ! |
8516 | 384 |
|
14948 | 385 |
|
4443 | 386 |
Notification initialize! |