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Author:vwheeler
Date:2014-04-29T16:14:26.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@1344 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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2014-04-29 16:15:02 +00:00
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documentation/current/solutions/gui-building/eiffelvision-2/eiffelvision-library-reference-manual/widgets/primitives.wiki
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[[Property:title|Primitives]]
[[Property:weight|0]]
[[Property:uuid|09d70dd5-2e30-7615-88ac-4babe4eb7aa6]]
All EiffelVision 2 primitives inherit [[ref:libraries/vision2/reference/ev_primitive_chart|EV_PRIMITIVE]] .
A primitive is an EiffelVision 2 widget that may not contain other widgets. Primitives may be placed in [[Containers|containers]], but a primitive [[Widgets|widget ]] may not contain any child widgets. Some examples of primitives are [[ref:libraries/vision2/reference/ev_button_chart|EV_BUTTON]] and [[ref:libraries/vision2/reference/ev_label_chart|EV_LABEL]]. All EiffelVision 2 primitives inherit from [[ref:libraries/vision2/reference/ev_primitive_chart|EV_PRIMITIVE]].
==What is a primitive?==
A primitive is a EiffelVision 2 widget that may not contain other widgets. Primitives may be placed in [[Containers|containers]] , but a [[Widgets|widget ]] may not contain any child widgets. Some examples of primitives are [[ref:libraries/vision2/reference/ev_button_chart|EV_BUTTON]] and [[ref:libraries/vision2/reference/ev_label_chart|EV_LABEL]] .
==Features of a primitive==
All primitives inherit from [[ref:libraries/vision2/reference/ev_tooltipable_chart|EV_TOOLTIPABLE]] and therefore can have tooltips assigned to them. They all inherit many features from [[ref:libraries/vision2/reference/ev_widget_chart|EV_WIDGET]] . Each descendent of [[ref:libraries/vision2/reference/ev_primitive_chart|EV_PRIMITIVE]] will typically have many available features, specific to their type. For example, [[ref:libraries/vision2/reference/ev_separator_chart|EV_SEPARATOR]] has no extra features, but [[ref:libraries/vision2/reference/ev_label_chart|EV_LABEL]] has features for modifying the current font and also the text to be displayed.
==Features of a Primitive==
==Widgets as item holders==
All primitives inherit from [[ref:libraries/vision2/reference/ev_tooltipable_chart|EV_TOOLTIPABLE]] and therefore may have tooltips assigned to them. They all inherit many features from [[ref:libraries/vision2/reference/ev_widget_chart|EV_WIDGET]]. Each descendent of [[ref:libraries/vision2/reference/ev_primitive_chart|EV_PRIMITIVE]] will typically have many features specific to its type. For example, [[ref:libraries/vision2/reference/ev_separator_chart|EV_SEPARATOR]] has no extra features, but [[ref:libraries/vision2/reference/ev_label_chart|EV_LABEL]] has features for modifying the current font and text to be displayed.
Although no primitive can contain another widget, certain primitives may contain one or more [[Items|items]] . One example of this is an [[ref:libraries/vision2/reference/ev_list_chart| EV_LIST]] containing [[ref:libraries/vision2/reference/ev_list_item_chart|EV_LIST_ITEM]] s.
==Widgets as Item Holders==
Although no primitive can contain another widget, certain primitives may contain one or more [[Items|items]]. One example of this is an [[ref:libraries/vision2/reference/ev_list_chart| EV_LIST]] containing [[ref:libraries/vision2/reference/ev_list_item_chart|EV_LIST_ITEM]]s.