Class TabFolder

  • All Implemented Interfaces:
    Drawable

    public class TabFolder
    extends Composite
    Instances of this class implement the notebook user interface metaphor. It allows the user to select a notebook page from set of pages.

    The item children that may be added to instances of this class must be of type TabItem. Control children are created and then set into a tab item using TabItem#setControl.

    Note that although this class is a subclass of Composite, it does not make sense to set a layout on it.

    Styles:
    TOP, BOTTOM
    Events:
    Selection

    Note: Only one of the styles TOP and BOTTOM may be specified.

    IMPORTANT: This class is not intended to be subclassed.

    See Also:
    TabFolder, TabItem snippets, SWT Example: ControlExample, Sample code and further information
    Restriction:
    This class is not intended to be subclassed by clients.
    • Constructor Detail

      • TabFolder

        public TabFolder​(Composite parent,
                         int style)
        Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

        The style value is either one of the style constants defined in class SWT which is applicable to instances of this class, or must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those SWT style constants. The class description lists the style constants that are applicable to the class. Style bits are also inherited from superclasses.

        Parameters:
        parent - a composite control which will be the parent of the new instance (cannot be null)
        style - the style of control to construct
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the parent is null
        SWTException -
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
        • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
        See Also:
        SWT, SWT.TOP, SWT.BOTTOM, Widget.checkSubclass(), Widget.getStyle()
    • Method Detail

      • addSelectionListener

        public void addSelectionListener​(SelectionListener listener)
        Adds the listener to the collection of listeners who will be notified when the user changes the receiver's selection, by sending it one of the messages defined in the SelectionListener interface.

        When widgetSelected is called, the item field of the event object is valid. widgetDefaultSelected is not called.

        Parameters:
        listener - the listener which should be notified when the user changes the receiver's selection
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the listener is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        See Also:
        SelectionListener, removeSelectionListener(org.eclipse.swt.events.SelectionListener), SelectionEvent
      • checkSubclass

        protected void checkSubclass()
        Description copied from class: Widget
        Checks that this class can be subclassed.

        The SWT class library is intended to be subclassed only at specific, controlled points (most notably, Composite and Canvas when implementing new widgets). This method enforces this rule unless it is overridden.

        IMPORTANT: By providing an implementation of this method that allows a subclass of a class which does not normally allow subclassing to be created, the implementer agrees to be fully responsible for the fact that any such subclass will likely fail between SWT releases and will be strongly platform specific. No support is provided for user-written classes which are implemented in this fashion.

        The ability to subclass outside of the allowed SWT classes is intended purely to enable those not on the SWT development team to implement patches in order to get around specific limitations in advance of when those limitations can be addressed by the team. Subclassing should not be attempted without an intimate and detailed understanding of the hierarchy.

        Overrides:
        checkSubclass in class Composite
      • getItem

        public TabItem getItem​(int index)
        Returns the item at the given, zero-relative index in the receiver. Throws an exception if the index is out of range.
        Parameters:
        index - the index of the item to return
        Returns:
        the item at the given index
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • getItem

        public TabItem getItem​(Point point)
        Returns the tab item at the given point in the receiver or null if no such item exists. The point is in the coordinate system of the receiver.
        Parameters:
        point - the point used to locate the item
        Returns:
        the tab item at the given point, or null if the point is not in a tab item
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the point is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.4
      • getItemCount

        public int getItemCount()
        Returns the number of items contained in the receiver.
        Returns:
        the number of items
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • getItems

        public TabItem[] getItems()
        Returns an array of TabItems which are the items in the receiver.

        Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.

        Returns:
        the items in the receiver
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • getSelection

        public TabItem[] getSelection()
        Returns an array of TabItems that are currently selected in the receiver. An empty array indicates that no items are selected.

        Note: This is not the actual structure used by the receiver to maintain its selection, so modifying the array will not affect the receiver.

        Returns:
        an array representing the selection
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • getSelectionIndex

        public int getSelectionIndex()
        Returns the zero-relative index of the item which is currently selected in the receiver, or -1 if no item is selected.
        Returns:
        the index of the selected item
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • indexOf

        public int indexOf​(TabItem item)
        Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. If no item is found, returns -1.
        Parameters:
        item - the search item
        Returns:
        the index of the item
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the item is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • setSelection

        public void setSelection​(TabItem item)
        Sets the receiver's selection to the given item. The current selected is first cleared, then the new item is selected.
        Parameters:
        item - the item to select
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the item is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.2
      • setSelection

        public void setSelection​(TabItem[] items)
        Sets the receiver's selection to be the given array of items. The current selected is first cleared, then the new items are selected.
        Parameters:
        items - the array of items
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the items array is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • setFont

        public void setFont​(Font font)
        Description copied from class: Control
        Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.
        Overrides:
        setFont in class Control
        Parameters:
        font - the new font (or null)
      • setSelection

        public void setSelection​(int index)
        Selects the item at the given zero-relative index in the receiver. If the item at the index was already selected, it remains selected. The current selection is first cleared, then the new items are selected. Indices that are out of range are ignored.
        Parameters:
        index - the index of the item to select
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver