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Implementing the UI Automation Transform Control Pattern

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This topic introduces guidelines and conventions for implementing ITransformProvider, including information about properties and methods. Links to additional references are listed at the end of the topic.

The Transform control pattern is used to support controls that can be moved, resized, or rotated within a two-dimensional space. For examples of controls that implement this control pattern, see Control Pattern Mapping for UI Automation Clients.

This topic contains the following sections.

  • Implementation Guidelines and Conventions
  • Required Members for ITransformProvider
  • Related Topics

Implementation Guidelines and Conventions

When implementing the Transform control pattern, note the following guidelines and conventions:

  • Support for this control pattern is not limited to objects on the desktop. This control pattern must also be supported by the children of a container object if the children can be moved, resized, or rotated freely within the boundaries of the container.
  • An object cannot be moved, resized, or rotated such that its resulting screen location would be completely outside the coordinates of its container and therefore inaccessible to the keyboard or mouse (for example, when a top-level window is moved off-screen or a child object is moved outside the boundaries of the container's viewport). In these cases, the object is placed as close to the requested screen coordinates as possible with the top or left coordinates overridden to be within the container boundaries.
  • For multi-monitor systems, if an object is moved, resized, or rotated completely outside the combined desktop screen coordinates, the object is placed on the primary monitor as close to the requested coordinates as possible.
  • All parameters and property values are absolute and independent of locale.

Required Members for ITransformProvider

The following properties and methods are required for implementing the ITransformProvider interface.

Required members Member type Notes
ITransformProvider::CanMove Property None
ITransformProvider::CanResize Property None
ITransformProvider::CanRotate Property None
ITransformProvider::Move Method None
ITransformProvider::Resize Method None
ITransformProvider::Rotate Method None

This control pattern has no associated events.