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Date:2008-09-19T14:06:51.000000Z


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documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/common-message-hooks.wiki
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[[Property:title|Common message hooks]]
[[Property:weight|4]]
[[Property:uuid|356b5211-f710-6509-3609-8d717ff425f7]]
Each WEL library component implements a set of routines for processing the most common messages that a component receives. For example, looking at [[ref:libraries/wel/reference/wel_frame_window_chart|WEL_FRAME_WINDOW]] , you will see that there are many features which begin `on_'. Each of these features enable the user to know when a specific event has occurred, and to perform the appropriate processing as a result of this event. Most of the time, you will only be interested in a small subset of these, necessary to your program. For example, below is the code for on_paint:
<code>
on_paint (paint_dc: WEL_PAINT_DC; invalid_rect: WEL_RECT) is

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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]]

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documentation/current/platform-specifics/microsoft-windows/wel/wel-common-concepts/inheriting-wel-application.wiki
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[[Property:title|Inheriting WEL_APPLICATION]]
[[Property:weight|1]]
[[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 [[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:title|Redefining `init_application']]
[[Property:weight|2]]
[[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:title|Redefining main_window]]
[[Property:weight|1]]
[[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 [[Tutorial|tutorial]] for a simple demonstration of how to do this. }}