|
Eclipse Platform 2.0 |
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--org.eclipse.swt.widgets.Widget | +--org.eclipse.swt.widgets.Control | +--org.eclipse.swt.widgets.Scrollable | +--org.eclipse.swt.widgets.Composite | +--org.eclipse.swt.widgets.ToolBar
Instances of this class support the layout of selectable tool bar items.
The item children that may be added to instances of this class
must be of type ToolItem
.
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.
Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
IMPORTANT: This class is not intended to be subclassed.
Field Summary |
Fields inherited from class org.eclipse.swt.widgets.Control |
handle |
Constructor Summary | |
ToolBar(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. |
Rectangle |
computeTrim(int x,
int y,
int width,
int height)
Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area. |
ToolItem |
getItem(int index)
Returns the item at the given, zero-relative index in the receiver. |
ToolItem |
getItem(Point point)
Returns the item at the given point in the receiver or null if no such item exists. |
int |
getItemCount()
Returns the number of items contained in the receiver. |
ToolItem[] |
getItems()
Returns an array of TabItem s which are the items
in the receiver. |
int |
getRowCount()
Returns the number of rows in the receiver. |
int |
indexOf(ToolItem 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. |
Methods inherited from class org.eclipse.swt.widgets.Composite |
getChildren, getLayout, getTabList, layout, layout, setFocus, setLayout, setTabList |
Methods inherited from class org.eclipse.swt.widgets.Scrollable |
getClientArea, getHorizontalBar, getVerticalBar |
Methods inherited from class org.eclipse.swt.widgets.Widget |
addDisposeListener, addListener, checkWidget, dispose, getData, getData, getStyle, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public ToolBar(Composite parent, int style)
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.
parent
- a composite control which will be the parent of the new instance (cannot be null)style
- the style of control to construct
IllegalArgumentException
- SWTException
- SWT.FLAT
,
SWT.WRAP
,
SWT.RIGHT
,
SWT.HORIZONTAL
,
SWT.VERTICAL
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
protected void checkSubclass()
Widget
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.
checkSubclass
in class Composite
public Point computeSize(int wHint, int hHint, boolean changed)
Control
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.
computeSize
in class Composite
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
Layout
,
Control.getBorderWidth()
,
Control.getBounds()
,
Control.getSize()
,
Control.pack()
,
"computeTrim, getClientArea for controls that implement them"public Rectangle computeTrim(int x, int y, int width, int height)
Scrollable
In other words, it returns a rectangle such that, if the receiver's bounds were set to that rectangle, the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings") would be the rectangle described by the arguments (relative to the receiver's parent).
computeTrim
in class Scrollable
Scrollable.getClientArea()
public ToolItem getItem(int index)
index
- the index of the item to return
IllegalArgumentException
- SWTException
- public ToolItem getItem(Point point)
point
- the point used to locate the item
IllegalArgumentException
- SWTException
- public int getItemCount()
SWTException
- public ToolItem[] getItems()
TabItem
s 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.
SWTException
- public int getRowCount()
WRAP
style, the
number of rows can be greater than one. Otherwise,
the number of rows is always one.
SWTException
- public int indexOf(ToolItem item)
item
- the search item
IllegalArgumentException
- SWTException
-
|
Eclipse Platform 2.0 |
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |