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## org.eclipse.ui
Interface IPlaceholderFolderLayout

All Known Subinterfaces:
  IFolderLayout

public interface IPlaceholderFolderLayout

An `IPlaceholderFolderLayout` is used to define the initial places for page placeholders within a folder placeholder. The folder itself is a component within an `IPageLayout`.

This interface is not intended to be implemented by clients.

Since:
  2.0
See Also:
  `IPageLayout.createPlaceholderFolder(java.lang.String, int, float, java.lang.String)`

Method Summary
`void` | `addPlaceholder(String viewId)` Adds an invisible placeholder for a view with the given id to this folder.

Method Detail

### addPlaceholder

    public void addPlaceholder(String viewId)

  Adds an invisible placeholder for a view with the given id to this folder. A view placeholder is used to define the position of a view before the view appears. Initially, it is invisible; however, if the user ever opens a view with the same id as a placeholder, the view will replace the placeholder as it is being made visible. The id must name a view contributed to the workbench's view extension point (named `"org.eclipse.ui.views"`).

  Parameters:
    `viewId` - the view id

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