Eclipse Platform
Release 4.2

org.eclipse.swt.widgets
Class CoolBar

java.lang.Object
  extended by org.eclipse.swt.widgets.Widget
      extended by org.eclipse.swt.widgets.Control
          extended by org.eclipse.swt.widgets.Scrollable
              extended by org.eclipse.swt.widgets.Composite
                  extended by org.eclipse.swt.widgets.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
Restriction:
This class is not intended to be subclassed by clients.

Field Summary
 
Fields inherited from class org.eclipse.swt.widgets.Control
handle
 
Constructor Summary
CoolBar(Composite parent, int style)
          Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.
 
Method Summary
protected  void checkSubclass()
          Checks that this class can be subclassed.
 Point computeSize(int wHint, int hHint, boolean changed)
          Returns the preferred size of the receiver.
 CoolItem getItem(int index)
          Returns the item that is currently displayed at the given, zero-relative index.
 int getItemCount()
          Returns the number of items contained in the receiver.
 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.
 CoolItem[] getItems()
          Returns an array of CoolItems in the order in which they are currently being displayed.
 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.
 boolean getLocked()
          Returns whether or not the receiver is 'locked'.
 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.
 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.
 void setItemLayout(int[] itemOrder, int[] wrapIndices, Point[] sizes)
          Sets the receiver's item order, wrap indices, and item sizes all at once.
 void setLocked(boolean locked)
          Sets whether or not the receiver is 'locked'.
 void setWrapIndices(int[] indices)
          Sets the indices of all item(s) in the receiver that will begin on a new row.
 
Methods inherited from class org.eclipse.swt.widgets.Composite
changed, drawBackground, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setLayoutDeferred, setTabList
 
Methods inherited from class org.eclipse.swt.widgets.Scrollable
computeTrim, getClientArea, getHorizontalBar, getScrollbarsMode, getVerticalBar
 
Methods inherited from class org.eclipse.swt.widgets.Control
addControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addMouseWheelListener, addPaintListener, addTouchListener, addTraverseListener, computeSize, dragDetect, dragDetect, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getDragDetect, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getRegion, getShell, getSize, getToolTipText, getTouchEnabled, getVisible, internal_dispose_GC, internal_new_GC, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, print, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removeMouseWheelListener, removePaintListener, removeTouchListener, removeTraverseListener, setBackground, setBackgroundImage, setBounds, setBounds, setCapture, setCursor, setDragDetect, setEnabled, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setRegion, setSize, setSize, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, traverse, traverse, traverse, update
 
Methods inherited from class org.eclipse.swt.widgets.Widget
addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

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:
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 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 Composite
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:
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

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

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

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

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:
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

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
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

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

Eclipse Platform
Release 4.2

Guidelines for using Eclipse APIs.

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