1 | // |
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2 | // EventTarget.h |
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3 | // |
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4 | // $Id: //poco/1.3/XML/include/Poco/DOM/EventTarget.h#1 $ |
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5 | // |
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6 | // Library: XML |
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7 | // Package: DOM |
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8 | // Module: DOMEvents |
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9 | // |
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10 | // Definition of the DOM EventTarget interface. |
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11 | // |
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12 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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13 | // and Contributors. |
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14 | // |
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15 | // Permission is hereby granted, free of charge, to any person or organization |
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16 | // obtaining a copy of the software and accompanying documentation covered by |
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17 | // this license (the "Software") to use, reproduce, display, distribute, |
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18 | // execute, and transmit the Software, and to prepare derivative works of the |
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19 | // Software, and to permit third-parties to whom the Software is furnished to |
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20 | // do so, all subject to the following: |
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21 | // |
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22 | // The copyright notices in the Software and this entire statement, including |
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23 | // the above license grant, this restriction and the following disclaimer, |
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24 | // must be included in all copies of the Software, in whole or in part, and |
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25 | // all derivative works of the Software, unless such copies or derivative |
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26 | // works are solely in the form of machine-executable object code generated by |
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27 | // a source language processor. |
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28 | // |
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29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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35 | // DEALINGS IN THE SOFTWARE. |
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36 | // |
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37 | |
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38 | |
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39 | #ifndef DOM_EventTarget_INCLUDED |
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40 | #define DOM_EventTarget_INCLUDED |
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41 | |
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42 | |
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43 | #include "Poco/XML/XML.h" |
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44 | #include "Poco/DOM/DOMObject.h" |
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45 | #include "Poco/XML/XMLString.h" |
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46 | |
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47 | |
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48 | namespace Poco { |
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49 | namespace XML { |
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50 | |
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51 | |
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52 | class EventListener; |
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53 | class Event; |
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54 | |
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55 | |
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56 | class XML_API EventTarget: public DOMObject |
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57 | /// The EventTarget interface is implemented by all Nodes in an implementation |
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58 | /// which supports the DOM Event Model. Therefore, this interface can be obtained |
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59 | /// by using binding-specific casting methods on an instance of the Node interface. |
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60 | /// The interface allows registration and removal of EventListeners on an EventTarget |
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61 | /// and dispatch of events to that EventTarget. |
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62 | { |
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63 | public: |
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64 | virtual void addEventListener(const XMLString& type, EventListener* listener, bool useCapture) = 0; |
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65 | /// This method allows the registration of event listeners on |
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66 | /// the event target. If an EventListener is added to an |
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67 | /// EventTarget while it is processing an event, it will not |
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68 | /// be triggered by the current actions but may be triggered |
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69 | /// during a later stage of event flow, such as the bubbling phase. |
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70 | /// If multiple identical EventListeners are registered on the same |
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71 | /// EventTarget with the same parameters the duplicate instances are |
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72 | /// discarded. They do not cause the EventListener to be called twice and since they are |
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73 | /// discarded they do not need to be removed with the removeEventListener method. |
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74 | |
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75 | virtual void removeEventListener(const XMLString& type, EventListener* listener, bool useCapture) = 0; |
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76 | /// This method allows the removal of event listeners from the event |
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77 | /// target. If an EventListener is removed from an EventTarget while it is |
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78 | /// processing an event, it will not be triggered by the current actions. |
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79 | /// EventListeners can never be invoked after being removed. |
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80 | /// Calling removeEventListener with arguments which do not identify |
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81 | /// any currently registered EventListener on the EventTarget has no effect. |
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82 | |
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83 | virtual bool dispatchEvent(Event* evt) = 0; |
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84 | /// This method allows the dispatch of events into the implementations |
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85 | /// event model. Events dispatched in this manner will have the same capturing and |
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86 | /// bubbling behavior as events dispatched directly by the |
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87 | /// implementation. The target of the event is the EventTarget on |
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88 | /// which dispatchEvent is called. |
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89 | |
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90 | protected: |
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91 | virtual ~EventTarget(); |
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92 | }; |
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93 | |
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94 | |
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95 | } } // namespace Poco::XML |
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96 | |
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97 | |
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98 | #endif // DOM_EventTarget_INCLUDED |
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