Gets/sets whether or not the preview is marked active (selected) in the taskbar.
The controller for this preview. A controller is required to provide the behavior and appearance of the taskbar previews. It is responsible for determining the size and contents of the preview, which buttons are displayed and how the application responds to user actions on the preview.
Neither preview makes full use of the controller. See the documentation for nsITaskbarWindowPreview and nsITaskbarTabPreview for details on which controller methods are used.
The controller is not allowed to be null.
nsITaskbarPreviewController
The tooltip displayed above the preview when the user hovers over it
Default: an empty string
Whether or not the preview is visible.
Changing this option is expensive for tab previews since toggling this option will destroy/create the proxy window and its registration with the taskbar. If any step of that fails, an exception will be thrown.
For window previews, this operation is very cheap.
Default: false
Optional aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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nsITaskbarPreview
Common interface for both window and tab taskbar previews. This interface cannot be instantiated directly.