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Listening Attributes

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[The feature associated with this page, Windows Media Player SDK, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of Windows Media Player SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

A listening attribute is used to connect one attribute to another so that its value changes every time the value of the other attribute changes.

The listening attribute wmpprop: is the most useful. If the value of one attribute is specified to be the wmpprop: of a second attribute, the first value will be automatically updated to reflect the second value each time the second value changes.

Example:

<TEXT
  value="wmpprop:mySlider.value"
/>

In this way, the value of mySlider, shown by the position of the slider control, can also be shown as a number within a text box.

The two other listening attributes, wmpenabled: and wmpdisabled:, can be used to change the enabled attribute of a control depending on whether its functionality is currently available in the player. These attributes can listen only to methods of the Controls object.

Example:

<BUTTON 
  id="play" 
  enabled="wmpenabled:player.controls.play"
/>

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