Class CoolBar

  • All Implemented Interfaces:
    Drawable

    public class CoolBar
    extends Composite
    Instances of this class provide an area for dynamically positioning the items they contain.

    The item children that may be added to instances of this class must be of type CoolItem.

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

    Styles:
    FLAT, HORIZONTAL, VERTICAL
    Events:
    (none)

    Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.

    IMPORTANT: This class is not intended to be subclassed.

    See Also:
    CoolBar snippets, SWT Example: ControlExample, Sample code and further information
    • Constructor Detail

      • CoolBar

        public CoolBar​(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:
        java.lang.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.FLAT, SWT.HORIZONTAL, SWT.VERTICAL, Widget.checkSubclass(), Widget.getStyle()
    • Method Detail

      • 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
      • computeSize

        public Point computeSize​(int wHint,
                                 int hHint,
                                 boolean changed)
        Description copied from class: Control
        Returns the preferred size (in points) of the receiver.

        The preferred size of a control is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the control need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.

        If the changed flag is true, it indicates that the receiver's contents have changed, therefore any caches that a layout manager containing the control may have been keeping need to be flushed. When the control is resized, the changed flag will be false, so layout manager caches can be retained.

        Overrides:
        computeSize in class Control
        Parameters:
        wHint - the width hint (can be SWT.DEFAULT)
        hHint - the height hint (can be SWT.DEFAULT)
        changed - true if the control's contents have changed, and false otherwise
        Returns:
        the preferred size of the control.
        See Also:
        Layout, Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"
      • getItem

        public CoolItem getItem​(int index)
        Returns the item that is currently displayed at the given, zero-relative index. Throws an exception if the index is out of range.
        Parameters:
        index - the visual index of the item to return
        Returns:
        the item at the given visual index
        Throws:
        java.lang.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
      • 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 CoolItem[] getItems()
        Returns an array of CoolItems in the order in which they are currently being displayed.

        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 receiver's items in their current visual order
        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​(CoolItem item)
        Searches the receiver's items in the order they are currently being displayed, 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 visual order index of the search item, or -1 if the item is not found
        Throws:
        java.lang.IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the item is null
        • ERROR_INVALID_ARGUMENT - if the item is disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • getItemOrder

        public int[] getItemOrder()
        Returns an array of zero-relative ints that map the creation order of the receiver's items to the order in which they are currently being displayed.

        Specifically, the indices of the returned array represent the current visual order of the items, and the contents of the array represent the creation order of the items.

        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 current visual order of the receiver's 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
      • setBackground

        public void setBackground​(Color color)
        Description copied from class: Control
        Sets the receiver's background color to the color specified by the argument, or to the default system color for the control if the argument is null.

        Note: This operation is a hint and may be overridden by the platform.

        Overrides:
        setBackground in class Control
        Parameters:
        color - the new color (or null)
      • getItemSizes

        public Point[] getItemSizes()
        Returns an array of points whose x and y coordinates describe the widths and heights (respectively) of the items in the receiver in the order in which they are currently being displayed.
        Returns:
        the receiver's item sizes in their current visual order
        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
      • getLocked

        public boolean getLocked()
        Returns whether or not the receiver is 'locked'. When a coolbar is locked, its items cannot be repositioned.
        Returns:
        true if the coolbar is locked, false otherwise
        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
        Since:
        2.0
      • getWrapIndices

        public int[] getWrapIndices()
        Returns an array of ints that describe the zero-relative indices of any item(s) in the receiver that will begin on a new row. The 0th visible item always begins the first row, therefore it does not count as a wrap index.
        Returns:
        an array containing the receiver's wrap indices, or an empty array if all items are in one row
        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
      • setLocked

        public void setLocked​(boolean locked)
        Sets whether or not the receiver is 'locked'. When a coolbar is locked, its items cannot be repositioned.
        Parameters:
        locked - lock the coolbar if true, otherwise unlock the coolbar
        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
        Since:
        2.0
      • setWrapIndices

        public void setWrapIndices​(int[] indices)
        Sets the indices of all item(s) in the receiver that will begin on a new row. The indices are given in the order in which they are currently being displayed. The 0th item always begins the first row, therefore it does not count as a wrap index. If indices is null or empty, the items will be placed on one line.
        Parameters:
        indices - an array of wrap indices, or null
        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
      • setCursor

        public void setCursor​(Cursor cursor)
        Description copied from class: Control
        Sets the receiver's cursor to the cursor specified by the argument, or to the default cursor for that kind of control if the argument is null.

        When the mouse pointer passes over a control its appearance is changed to match the control's cursor.

        Overrides:
        setCursor in class Control
        Parameters:
        cursor - the new cursor (or null)
      • setItemLayout

        public void setItemLayout​(int[] itemOrder,
                                  int[] wrapIndices,
                                  Point[] sizes)
        Sets the receiver's item order, wrap indices, and item sizes all at once. This method is typically used to restore the displayed state of the receiver to a previously stored state.

        The item order is the order in which the items in the receiver should be displayed, given in terms of the zero-relative ordering of when the items were added.

        The wrap indices are the indices of all item(s) in the receiver that will begin on a new row. The indices are given in the order specified by the item order. The 0th item always begins the first row, therefore it does not count as a wrap index. If wrap indices is null or empty, the items will be placed on one line.

        The sizes are specified in an array of points whose x and y coordinates describe the new widths and heights (respectively) of the receiver's items in the order specified by the item order.

        Parameters:
        itemOrder - an array of indices that describe the new order to display the items in
        wrapIndices - an array of wrap indices, or null
        sizes - an array containing the new sizes for each of the receiver's items in visual order
        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
        java.lang.IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if item order or sizes is null
        • ERROR_INVALID_ARGUMENT - if item order or sizes is not the same length as the number of items
      • setOrientation

        public void setOrientation​(int orientation)
        Description copied from class: Control
        Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.

        Overrides:
        setOrientation in class Control
        Parameters:
        orientation - new orientation style