author | Claus Gittinger <cg@exept.de> |
Sun, 23 Nov 2014 14:42:46 +0100 | |
changeset 3398 | 27762e2393d8 |
parent 3036 | 158bdd183939 |
child 3661 | c340d371658a |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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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:libview2' }" |
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Object subclass:#EventListener |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Interface-Support-UI' |
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! |
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!EventListener class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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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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documentation |
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" |
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abstract class for event listeners. EventListeners can be used to intercept |
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incoming events (keyboard & mouse) directly from a sensor, or even |
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for a complete display device. |
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A concrete application is the bubble help, which tracks entering/leaving |
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views, and pops up some help message. |
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See concrete code in ActiveHelp. |
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For each intercepted event, a corresponding method is called for in instances |
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of myself - these MUST return true, if the event is to be ignored (i.e. |
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assumed to be processed and consumed by the reader, |
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and MUST return false, if the normal event procedure should be performed. |
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Since this is an abstract class, |
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all of my intercept methods return false. |
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They are meant to be redefined in concrete subclasses. |
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[see also:] |
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WindowSensor WindowEvent WindowGroup |
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[author:] |
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Claus Gittinger |
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! ! |
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!EventListener class methodsFor:'others'! |
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version_CVS |
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^ '$Header: /cvs/stx/stx/libview2/EventListener.st,v 1.29 2012-11-27 17:44:36 ab Exp $' |
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! ! |
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!EventListener methodsFor:'event handling'! |
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buttonMotion:buttonAndModifierState x:x y:y view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:57:54 / cg" |
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! |
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buttonMultiPress:button x:x y:y view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:57:58 / cg" |
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! |
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buttonPress:button x:x y:y view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:58:01 / cg" |
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! |
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buttonRelease:button x:x y:y view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:58:03 / cg" |
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! |
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focusInView:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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! |
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focusOutView:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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! |
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hasKeyboardFocus:aBoolean view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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! |
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hotkeyWithId:aHotKeyId rawKey:theRawKey view: aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:57:54 / cg" |
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! |
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keyPress:key x:x y:y view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:58:08 / cg" |
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! |
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keyRelease:key x:x y:y view:aView |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:58:11 / cg" |
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! |
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pass x/y with mouseWheel event
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mouseWheelMotion:state x:x y:y amount:amount deltaTime:dTime view:aView |
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"not handled here - can be redefined in a concrete subclass" |
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^ false |
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"Modified: / 23.4.1996 / 21:57:54 / cg" |
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"Created: / 21.5.1999 / 13:07:13 / cg" |
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! |
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pointerEnter:state x:x y:y view:view |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:58:14 / cg" |
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! |
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pointerLeave:state view:view |
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"not handled here - should be redefined in a concrete subclass" |
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^ false |
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"Modified: 23.4.1996 / 21:58:17 / cg" |
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! ! |
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!EventListener methodsFor:'event handling-basic'! |
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processEvent:ev |
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"process an event; if true is returned, the event is considered to be |
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'eaten' by the listener, and not passed to the view. |
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If false is returned, the event is processed as usual. |
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Here, the event is dispatched into one of the button*/key* etc. methods" |
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"/ subclasses may do: |
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"/ |eventHasBeenProcessed| |
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"/ |
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"/ eventHasBeenProcessed := false. |
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"/ Error handle:[:ex | |
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"/ ('Listener [info]: error while processing event: ' , ex description) infoPrintCR. |
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"/ ] do:[ |
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"/ eventHasBeenProcessed := ev dispatchWithViewArgumentTo:self |
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"/ ]. |
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"/ ^ eventHasBeenProcessed |
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^ false |
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"Modified: / 29-06-2011 / 19:13:18 / cg" |
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! ! |
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!EventListener methodsFor:'events-window creation'! |
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postCreateView:aView |
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"a synthetic event: |
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some view was created" |
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^ self |
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"Modified: / 29-06-2011 / 18:55:53 / cg" |
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! |
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preCreateView:aView |
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"a synthetic event: |
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some view is about to be created; |
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gives me a chance to intercept and change size, origin, color, etc." |
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^ self |
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"Modified: / 29-06-2011 / 18:54:19 / cg" |
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! |
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preCreateView:aView origin:org |
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"Obsolete now - the system will now send a preCreateView: event (without origin arg). |
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not really an event: |
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invoked right before a view is about to be physically created. |
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May return a new origin." |
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^ org |
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"Modified: / 29-06-2011 / 18:55:23 / cg" |
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! ! |
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!EventListener methodsFor:'listen'! |
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listen |
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"install myself as listener" |
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WindowSensor addEventListener:self |
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" |
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|listener| |
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listener := EventListener new. |
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listener listen. |
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(Delay forSeconds:20) wait. |
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listener unlisten |
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" |
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! |
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unlisten |
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"uninstall myself as listener" |
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WindowSensor removeEventListener:self |
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! ! |
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