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Date:2008-09-30T16:23:49.000000Z


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4
documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/common-message-hooks.wiki
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@@ -11,12 +11,12 @@ Each WEL library component implements a set of routines for processing the most
An on_paint message corresponds to the Wm_paint message generated by Windows whenever it needs to re-paint a window, and if you look at the feature, you can see that the arguments are a [[ref:libraries/wel/reference/wel_paint_dc_chart|WEL_PAINT_DC]] and a[[ref:libraries/wel/reference/wel_rect_chart| WEL_RECT]] . which are relevant to this message. By redefining this feature (and others as required), your code will be able to respond appropriately to windows events.
{{note| '''Note'''. See [[Tutorial Step 2|step2]] in the [[WEL Tutorial|tutorial]] for a simple demonstration involving the re-definition of <eiffel>on_left_button_down</eiffel>. }}
{{note|. See [[Tutorial Step 2|step2]] in the [[WEL Tutorial|tutorial]] for a simple demonstration involving the re-definition of <eiffel>on_left_button_down</eiffel>. }}
For different messages received by a control, the arguments will differ (sometimes there are none), but those arguments will always be relevant to the message. For example, on_menu_command from [[ref:libraries/wel/reference/wel_composite_window_chart|WEL_COMPOSITE_WINDOW]] has an <eiffel>INTEGER</eiffel> as an argument, the value of which is a unique menu identifier. <br/>
{{note| '''Note'''. Not all windows events have a corresponding `on_' message hook defined in WEL. If you wish to process a Windows message that does not correspond to one of the available features, you will need to redefine process_message. <br/>
{{note|. Not all windows events have a corresponding `on_' message hook defined in WEL. If you wish to process a Windows message that does not correspond to one of the available features, you will need to redefine process_message. <br/>
}}

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documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/index.wiki
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[[Property:title|WEL Common Concepts]]
[[Property:weight|0]]
[[Property:uuid|f2486cae-0ce5-7360-d40f-aea5f2766ebd]]
Some useful WEL concepts are listed below:
* [[Inheriting WEL_APPLICATION|Inheriting WEL_APPLICATION]]
* [[Redefining main_window|Redefining main_window]]
* [[Redefining `init_application'|Redefining init_application]]
* [[Common message hooks|Common message hooks]]
WEL concepts you should understand.

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documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/inheriting-wel-application.wiki
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[[Property:uuid|e6b092c9-dfb1-7bf1-67fc-647d047b6a01]]
For most WEL applications that you write, you will need to inherit [[ref:libraries/wel/reference/wel_application_chart|WEL_APPLICATION]] .
{{note| '''Note'''. See [[Tutorial Step 1|step1]] in the [[WEL Tutorial|tutorial]] for a simple demonstration of how to do this }}
{{note|. See [[Tutorial Step 1|step1]] in the [[WEL Tutorial|tutorial]] for a simple demonstration of how to do this }}

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documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/redefining-init-application.wiki
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[[Property:uuid|95d9b971-7470-9191-3023-b99c22354e8f]]
[[ref:libraries/wel/reference/wel_application_chart|WEL_APPLICATION]] contains a feature <eiffel>init_application</eiffel> which does nothing by default, but is called before the application is started. This can be redefined to execute tasks that must be performed before the application is running. A common redefinition is to allow the loading of common dll's, see [[List View|list_view]] sample for a demonstration of this technique.

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documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/redefining-main-window.wiki
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[[Property:uuid|f7bfd5d0-86ef-5387-ba79-5461a516bcf6]]
When you inherit [[ref:/libraries/wel/reference/wel_application_chart|WEL_APPLICATION]] , you will need to implement the deferred feature main_window as a once function. This will be the main window of your application, and can be any descendent of [[ref:libraries/wel/reference/wel_composite_window_chart|WEL_COMPOSITE_WINDOW]] .
{{note| '''Note'''. See [[Tutorial Step 2|step2]] in the [[WEL Tutorial|tutorial]] for a simple demonstration of how to do this. }}
{{note|. See [[Tutorial Step 2|step2]] in the [[WEL Tutorial|tutorial]] for a simple demonstration of how to do this. }}