The Properties cluster contains all the common properties available for EiffelVision 2 widgets and items. Every EiffelVision 2 widget has the same set of properties inherited from EV_WIDGET, but many widgets also inherit additional properties, further refining the behavior of the widget.

EV_WIDGET inherits the following properties:

Use disable_sensitive to disable event handling, and enable_sensitive to restore event handling.

    • If a EiffelVision 2 component inherits from EV_COLORIZABLE, it has facilities for modifying its foreground and background colors.

Use set_foreground_color to set foreground_color and set_background_color to set background_color.
Use set_default_colors to restore the colors to their defaults.

    • If a EiffelVision 2 component inherits from EV_POSITIONED, it is possible to query its current position, size and minimum size.

Use x_position and y_position to find its position relative to its parent.
Use width and height to find its size.
Use minimum_width and minimum_height to find its minimum size.

    • If a EiffelVision 2 component inherits from EV_CONTAINABLE, it is able make calls on its parent. Use parent to make calls on the current parent.

Note: EV_CONTAINABLE has no features for setting the parent. In EiffelVision 2, a child has no features for setting its parent, while a parent such a descendant of EV_CONTAINER contains routines for adding children (one example is extend).

The following are several more properties used within EiffelVision 2:

For a full list of properties available, see the "interface/properties" sub-cluster of the EiffelVision 2 library.

cached: 06/19/2024 4:33:42.000 PM