Composite (Eclipse 3.5.2 Javadoc and Source)

java.lang.Object
- org.eclipse.swt.widgets.Widget
- - org.eclipse.swt.widgets.Control
  - - org.eclipse.swt.widgets.Scrollable
    - - org.eclipse.swt.widgets.Composite

All Implemented Interfaces:

Drawable

Direct Known Subclasses:

Browser, BrowserViewer, BulletListBlock, Canvas, CBanner, CCombo, ChangeExceptionsControl, ChangeParametersControl, ChangesSection, Combo, ConfigureSynchronizeScheduleComposite, ContainerSelectionGroup, CoolBar, CounterPanel, CTabFolder, CTabFolder, CustomizationTab, DateTime, DragHandle, DrillDownComposite, ExpandBar, FilteredList, FilteredTree, Form, Group, HeapStatus, ImageAndMessageArea, LayoutComposite, NonProxyHostsComposite, OleClientSite, OleFrame, PageBook, ProgressIndicator, ProgressInfoItem, ProgressMonitorPart, ProxyEntriesComposite, QualifiedNameComponent, RefactoringHistoryControl, RefactoringLocationControl, RefactoringLocationControl, RefactoringScriptLocationControl, RootPageForm.PageComposite, SashForm, ScrolledComposite, Spinner, StatusLine, TabbedPropertyComposite, TabbedPropertyList, TabbedPropertyTitle, TabFolder, Table, TableLayoutComposite, TableLayoutComposite, TableTree, ToolBar, Tree, TrimCommonUIHandle, ViewForm, ViewForm, WrappedPageBook
```
public class Composite
extends Scrollable
```
Instances of this class are controls which are capable of containing other controls.

Styles:

NO_BACKGROUND, NO_FOCUS, NO_MERGE_PAINTS, NO_REDRAW_RESIZE, NO_RADIO_GROUP, EMBEDDED, DOUBLE_BUFFERED

Events:

(none)

Note: The NO_BACKGROUND, NO_FOCUS, NO_MERGE_PAINTS, and NO_REDRAW_RESIZE styles are intended for use with Canvas. They can be used with Composite if you are drawing your own, but their behavior is undefined if they are used with subclasses of Composite other than Canvas.
Note: The CENTER style, although undefined for composites, has the same value as EMBEDDED which is used to embed widgets from other widget toolkits into SWT. On some operating systems (GTK, Motif), this may cause the children of this composite to be obscured.
This class may be subclassed by custom control implementors who are building controls that are constructed from aggregates of other controls.

See Also:
Canvas, Composite snippets, Sample code and further information

Field Summary

Fields
Modifier and Type	Field and Description
`(package private) int`	`backgroundMode`
`(package private) Layout`	`layout`
`(package private) int`	`layoutCount`
`(package private) Control[]`	`tabList`

Fields inherited from class org.eclipse.swt.widgets.Scrollable
horizontalBar, scrolledHandle, verticalBar

Fields inherited from class org.eclipse.swt.widgets.Control
accessible, background, backgroundImage, cursor, font, foreground, height, layoutData, menu, parent, region, toolTipText, width, x, y

Fields inherited from class org.eclipse.swt.widgets.Widget
CANVAS, CLICK, data, DEFAULT_HEIGHT, DEFAULT_WIDTH, DISABLED, display, DISPOSE_SENT, DISPOSED, DRAG_DETECT, DRAW_BACKGROUND, eventTable, handle, HIDDEN, jniRef, KEYED_DATA, LAYOUT_CHANGED, LAYOUT_CHILD, LAYOUT_NEEDED, MOVED, PARENT_BACKGROUND, RELEASED, RESIZED, state, style, THEME_BACKGROUND

Constructor Summary

Constructors
Constructor and Description
`Composite()` Prevents uninitialized instances from being created outside the package.
`Composite(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

Methods
Modifier and Type	Method and Description
`(package private) Control[]`	`_getChildren()`
`(package private) Control[]`	`_getTabList()`
`(package private) void`	`addChild(Control control)`
`(package private) int`	`backgoundProperty()`
`void`	`changed(Control[] changed)` Clears any data that has been cached by a Layout for all widgets that are in the parent hierarchy of the changed control up to and including the receiver.
`(package private) static int`	`checkStyle(int style)`
`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.
`(package private) Control[]`	`computeTabList()`
`(package private) void`	`createHandle()`
`(package private) void`	`createHandle(boolean scrolled, boolean menubar)`
`(package private) int`	`defaultBackground()`
`(package private) void`	`enableWidget(boolean enabled)`
`(package private) Composite`	`findDeferredControl()`
`(package private) Menu[]`	`findMenus(Control control)`
`(package private) void`	`fixScrollbarVisibility()`
`(package private) void`	`fixTabList(Control control)`
`int`	`getBackgroundMode()` Returns the receiver's background drawing mode.
`(package private) int`	`getCaretHandle()`
`Control[]`	`getChildren()` Returns a (possibly empty) array containing the receiver's children.
`Layout`	`getLayout()` Returns layout which is associated with the receiver, or null if one has not been set.
`boolean`	`getLayoutDeferred()` Returns `true` if the receiver has deferred the performing of layout, and `false` otherwise.
`(package private) Point`	`getLocation(Control child)`
`Control[]`	`getTabList()` Gets the (possibly empty) tabbing order for the control.
`(package private) void`	`HandlePreviewKeyDown(int sender, int e)`
`(package private) void`	`HandlePreviewMouseDown(int sender, int e)`
`(package private) void`	`HandlePreviewTextInput(int sender, int e)`
`(package private) boolean`	`hooksKeys()`
`boolean`	`isLayoutDeferred()` Returns `true` if the receiver or any ancestor up to and including the receiver's nearest ancestor shell has deferred the performing of layouts.
`(package private) boolean`	`isTabGroup()`
`void`	`layout()` If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children.
`void`	`layout(boolean changed)` If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children.
`void`	`layout(boolean changed, boolean all)` If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children.
`void`	`layout(Control[] changed)` Forces a lay out (that is, sets the size and location) of all widgets that are in the parent hierarchy of the changed control up to and including the receiver.
`(package private) void`	`markLayout(boolean changed, boolean all)`
`(package private) Point`	`minimumSize(int wHint, int hHint, boolean changed)`
`(package private) void`	`OnRender(int drawingContext)`
`(package private) int`	`parentingHandle()`
`(package private) void`	`releaseChildren(boolean destroy)`
`(package private) void`	`releaseWidget()`
`(package private) void`	`removeChild(Control control)`
`(package private) void`	`removeControl(Control control)`
`(package private) void`	`resized()`
`void`	`setAlpha(int alpha)` WARNING: THIS API IS UNDER CONSTRUCTION AND SHOULD NOT BE USED
`(package private) void`	`setBackgroundBrush(int brush)`
`void`	`setBackgroundMode(int mode)` Sets the background drawing mode to the argument which should be one of the following constants defined in class `SWT`: `INHERIT_NONE`, `INHERIT_DEFAULT`, `INHERIT_FORCE`.
`(package private) int`	`setBounds(int x, int y, int width, int height, int flags)`
`(package private) void`	`setClipping()`
`boolean`	`setFocus()` Causes the receiver to have the keyboard focus, such that all keyboard events will be delivered to it.
`(package private) void`	`setFont(int font, double size)`
`(package private) void`	`setForegroundBrush(int brush)`
`void`	`setLayout(Layout layout)` Sets the layout which is associated with the receiver to be the argument which may be null.
`void`	`setLayoutDeferred(boolean defer)` If the argument is `true`, causes subsequent layout operations in the receiver or any of its children to be ignored.
`(package private) boolean`	`setTabGroupFocus()`
`void`	`setTabList(Control[] tabList)` Sets the tabbing order for the specified controls to match the order that they occur in the argument list.
`(package private) boolean`	`translateMnemonic(Event event, Control control)`
`(package private) boolean`	`translateTraversal(int msg)`
`(package private) int`	`traversalCode(int key, int event)`
`(package private) void`	`updateBackgroundColor()`
`(package private) void`	`updateBackgroundImage()`
`(package private) void`	`updateBackgroundMode()`
`(package private) void`	`updateFont(Font oldFont, Font newFont)`
`(package private) void`	`updateLayout(boolean resize, boolean all)`

Methods inherited from class org.eclipse.swt.widgets.Scrollable
clientHandle, computeTrim, createScrollBar, createWidget, deregister, findScrollViewer, getClientArea, getHorizontalBar, getScrollBarHandle, getVerticalBar, HandlePreviewMouseWheel, register, releaseHandle, topHandle

Methods inherited from class org.eclipse.swt.widgets.Control
addControlListener, addDragDetectListener, addFocusListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addMouseWheelListener, addPaintListener, addTraverseListener, addWidget, backgroundHandle, backgroundProperty, borderHandle, checkBackground, checkBorder, checkBuffered, computeSize, computeSize, computeTabGroup, computeTabRoot, defaultFont, defaultForeground, destroyWidget, dragDetect, dragDetect, dragDetect, dragDetect, dragHandler, drawGripper, findBackgroundControl, findImageControl, findMnemonic, findThemeControl, fixFocus, forceFocus, getAccessible, getAlpha, getBackground, getBackgroundColor, getBackgroundImage, getBorderWidth, getBounds, getClipboardText, getCursor, getDragDetect, getEnabled, getFont, getForeground, getForegroundColor, getLayoutData, getLocation, getMenu, getMonitor, getParent, getPath, getRegion, getShell, getSize, getToolTipText, getTransform, getVisible, getWidgetControl, HandleContextMenuOpening, HandleLeftChanged, HandleLostKeyboardFocus, HandleMouseEnter, HandleMouseLeave, HandlePreviewGotKeyboardFocus, HandlePreviewKeyUp, HandlePreviewMouseMove, HandlePreviewMouseUp, HandleSizeChanged, HandleTopChanged, hasFocus, hookEvents, internal_dispose_GC, internal_new_GC, isActive, isEnabled, isFocusAncestor, isFocusControl, isReparentable, isShowing, isTabItem, isVisible, menuShell, mnemonicHit, mnemonicMatch, moveAbove, moveBelow, new_Accessible, pack, pack, print, redraw, redraw, redraw, releaseParent, removeControlListener, removeDragDetectListener, removeFocusListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removeMouseWheelListener, removePaintListener, removeTraverseListener, sendFocusEvent, setBackground, setBackground, setBackgroundImage, setBounds, setBounds, setCapture, setCursor, setDragDetect, setEffect, setEnabled, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setParent, setRedraw, setRegion, setSavedFocus, setSize, setSize, setTabItemFocus, setToolTipText, setTransform, setVisible, sort, sortAscending, toControl, toControl, toDisplay, toDisplay, translateMnemonic, traverse, traverse, traverseEscape, traverseGroup, traverseItem, traverseMnemonic, traversePage, traverseReturn, update, update, updateImages, widgetParent

Methods inherited from class org.eclipse.swt.widgets.Widget
_addListener, addDisposeListener, addListener, checkBits, checkEvent, checkOpened, checkOrientation, checkParent, checkWidget, createDotNetString, createJavaString, dispose, dragOverride, dumpObjectType, dumpVisualTree, error, filters, fixMnemonic, getData, getData, getDisplay, getListeners, getName, getNameText, getStyle, hasItems, hooks, isDisposed, isListening, isValidSubclass, isValidThread, mapEvent, mnemonicMatch, notifyListeners, postEvent, postEvent, release, removeDisposeListener, removeListener, removeListener, sendDragEvent, sendDragEvent, sendEvent, sendEvent, sendEvent, sendEvent, sendKeyEvent, sendMouseEvent, setClipping, setData, setData, setInputState, setKeyState, setNameScope, showMenu, toString, updateLayout

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - layout
```
Layout layout
```
  - tabList
```
Control[] tabList
```
  - layoutCount
```
int layoutCount
```
  - backgroundMode
```
int backgroundMode
```
- Constructor Detail
  - Composite
```
Composite()
```
    Prevents uninitialized instances from being created outside the package.
  - Composite
```
public Composite(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 widget which will be the parent of the new instance (cannot be null)
    style - the style of widget 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
    See Also:
    SWT.NO_BACKGROUND, SWT.NO_FOCUS, SWT.NO_MERGE_PAINTS, SWT.NO_REDRAW_RESIZE, SWT.NO_RADIO_GROUP, SWT.EMBEDDED, SWT.DOUBLE_BUFFERED, Widget.getStyle()
- Method Detail
  - checkStyle
```
static int checkStyle(int style)
```
  - getCaretHandle
```
int getCaretHandle()
```
  - _getChildren
```
Control[] _getChildren()
```
  - _getTabList
```
Control[] _getTabList()
```
  - addChild
```
void addChild(Control control)
```
  - backgoundProperty
```
int backgoundProperty()
```
  - changed
```
public void changed(Control[] changed)
```
    Clears any data that has been cached by a Layout for all widgets that are in the parent hierarchy of the changed control up to and including the receiver. If an ancestor does not have a layout, it is skipped.
    Parameters:
    changed - an array of controls that changed state and require a recalculation of size
    
    Throws:
    IllegalArgumentException -
    
    ERROR_INVALID_ARGUMENT - if the changed array is null any of its controls are null or have been disposed
    
    ERROR_INVALID_PARENT - if any control in changed is not in the widget tree of the receiver
    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:
    
    3.1
  - 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 Widget
  - computeTabList
```
Control[] computeTabList()
```
    Overrides:
    
    computeTabList in class Control
  - 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 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"
  - createHandle
```
void createHandle()
```
    Overrides:
    
    createHandle in class Widget
  - createHandle
```
void createHandle(boolean scrolled,
                boolean menubar)
```
  - defaultBackground
```
int defaultBackground()
```
    Overrides:
    
    defaultBackground in class Control
  - enableWidget
```
void enableWidget(boolean enabled)
```
    Overrides:
    
    enableWidget in class Control
  - findDeferredControl
```
Composite findDeferredControl()
```
  - findMenus
```
Menu[] findMenus(Control control)
```
    Overrides:
    
    findMenus in class Control
  - fixScrollbarVisibility
```
void fixScrollbarVisibility()
```
    Overrides:
    
    fixScrollbarVisibility in class Scrollable
  - fixTabList
```
void fixTabList(Control control)
```
  - getBackgroundMode
```
public int getBackgroundMode()
```
    Returns the receiver's background drawing mode. This will be one of the following constants defined in class SWT: INHERIT_NONE, INHERIT_DEFAULT, INHERTIT_FORCE.
    Returns:
    the background mode
    
    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:
    
    3.2
    
    See Also:
    SWT
  - getChildren
```
public Control[] getChildren()
```
    Returns a (possibly empty) array containing the receiver's children. Children are returned in the order that they are drawn. The topmost control appears at the beginning of the array. Subsequent controls draw beneath this control and appear later in the array.
    Note: This is not the actual structure used by the receiver to maintain its list of children, so modifying the array will not affect the receiver.
    Returns:
    an array of children
    
    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
    See Also:
    Control.moveAbove(org.eclipse.swt.widgets.Control), Control.moveBelow(org.eclipse.swt.widgets.Control)
  - getLayout
```
public Layout getLayout()
```
    Returns layout which is associated with the receiver, or null if one has not been set.
    Returns:
    the receiver's layout 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
  - getLocation
```
Point getLocation(Control child)
```
  - getTabList
```
public Control[] getTabList()
```
    Gets the (possibly empty) tabbing order for the control.
    Returns:
    tabList the ordered list of controls representing the tab 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
    See Also:
    setTabList(org.eclipse.swt.widgets.Control[])
  - hooksKeys
```
boolean hooksKeys()
```
  - getLayoutDeferred
```
public boolean getLayoutDeferred()
```
    Returns true if the receiver has deferred the performing of layout, and false otherwise.
    Returns:
    the receiver's deferred layout state
    
    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:
    
    3.1
    
    See Also:
    setLayoutDeferred(boolean), isLayoutDeferred()
  - HandlePreviewKeyDown
```
void HandlePreviewKeyDown(int sender,
                        int e)
```
    Overrides:
    
    HandlePreviewKeyDown in class Control
  - HandlePreviewMouseDown
```
void HandlePreviewMouseDown(int sender,
                          int e)
```
    Overrides:
    
    HandlePreviewMouseDown in class Control
  - HandlePreviewTextInput
```
void HandlePreviewTextInput(int sender,
                          int e)
```
    Overrides:
    
    HandlePreviewTextInput in class Control
  - isLayoutDeferred
```
public boolean isLayoutDeferred()
```
    Returns true if the receiver or any ancestor up to and including the receiver's nearest ancestor shell has deferred the performing of layouts. Otherwise, false is returned.
    Returns:
    the receiver's deferred layout state
    
    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:
    
    3.1
    
    See Also:
    setLayoutDeferred(boolean), getLayoutDeferred()
  - isTabGroup
```
boolean isTabGroup()
```
    Overrides:
    
    isTabGroup in class Control
  - layout
```
public void layout()
```
    If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children. If the receiver does not have a layout, do nothing.
    This is equivalent to calling layout(true).
    
    Note: Layout is different from painting. If a child is moved or resized such that an area in the parent is exposed, then the parent will paint. If no child is affected, the parent will not paint.
    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
  - layout
```
public void layout(boolean changed)
```
    If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children. If the argument is true the layout must not rely on any information it has cached about the immediate children. If it is false the layout may (potentially) optimize the work it is doing by assuming that none of the receiver's children has changed state since the last layout. If the receiver does not have a layout, do nothing.
    If a child is resized as a result of a call to layout, the resize event will invoke the layout of the child. The layout will cascade down through all child widgets in the receiver's widget tree until a child is encountered that does not resize. Note that a layout due to a resize will not flush any cached information (same as layout(false)).
    
    Note: Layout is different from painting. If a child is moved or resized such that an area in the parent is exposed, then the parent will paint. If no child is affected, the parent will not paint.
    Parameters:
    changed - true if the layout must flush its caches, and 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
  - layout
```
public void layout(boolean changed,
          boolean all)
```
    If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children. If the changed argument is true the layout must not rely on any information it has cached about its children. If it is false the layout may (potentially) optimize the work it is doing by assuming that none of the receiver's children has changed state since the last layout. If the all argument is true the layout will cascade down through all child widgets in the receiver's widget tree, regardless of whether the child has changed size. The changed argument is applied to all layouts. If the all argument is false, the layout will not cascade down through all child widgets in the receiver's widget tree. However, if a child is resized as a result of a call to layout, the resize event will invoke the layout of the child. Note that a layout due to a resize will not flush any cached information (same as layout(false)).
    
    Note: Layout is different from painting. If a child is moved or resized such that an area in the parent is exposed, then the parent will paint. If no child is affected, the parent will not paint.
    Parameters:
    changed - true if the layout must flush its caches, and false otherwise
    all - true if all children in the receiver's widget tree should be laid out, and 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:
    
    3.1
  - layout
```
public void layout(Control[] changed)
```
    Forces a lay out (that is, sets the size and location) of all widgets that are in the parent hierarchy of the changed control up to and including the receiver. The layouts in the hierarchy must not rely on any information cached about the changed control or any of its ancestors. The layout may (potentially) optimize the work it is doing by assuming that none of the peers of the changed control have changed state since the last layout. If an ancestor does not have a layout, skip it.
    Note: Layout is different from painting. If a child is moved or resized such that an area in the parent is exposed, then the parent will paint. If no child is affected, the parent will not paint.
    Parameters:
    changed - a control that has had a state change which requires a recalculation of its size
    
    Throws:
    IllegalArgumentException -
    
    ERROR_INVALID_ARGUMENT - if the changed array is null any of its controls are null or have been disposed
    
    ERROR_INVALID_PARENT - if any control in changed is not in the widget tree of the receiver
    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:
    
    3.1
  - OnRender
```
void OnRender(int drawingContext)
```
  - markLayout
```
void markLayout(boolean changed,
              boolean all)
```
    Overrides:
    
    markLayout in class Control
  - minimumSize
```
Point minimumSize(int wHint,
                int hHint,
                boolean changed)
```
  - parentingHandle
```
int parentingHandle()
```
  - releaseChildren
```
void releaseChildren(boolean destroy)
```
    Overrides:
    
    releaseChildren in class Scrollable
  - releaseWidget
```
void releaseWidget()
```
    Overrides:
    
    releaseWidget in class Control
  - removeChild
```
void removeChild(Control control)
```
  - removeControl
```
void removeControl(Control control)
```
  - resized
```
void resized()
```
    Overrides:
    
    resized in class Control
  - setAlpha
```
public void setAlpha(int alpha)
```
    WARNING: THIS API IS UNDER CONSTRUCTION AND SHOULD NOT BE USED
    
    Overrides:
    
    setAlpha in class Control
  - setBackgroundBrush
```
void setBackgroundBrush(int brush)
```
  - setBackgroundMode
```
public void setBackgroundMode(int mode)
```
    Sets the background drawing mode to the argument which should be one of the following constants defined in class SWT: INHERIT_NONE, INHERIT_DEFAULT, INHERIT_FORCE.
    Parameters:
    mode - the new background mode
    
    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:
    
    3.2
    
    See Also:
    SWT
  - setBounds
```
int setBounds(int x,
            int y,
            int width,
            int height,
            int flags)
```
    Overrides:
    
    setBounds in class Control
  - setClipping
```
void setClipping()
```
    Overrides:
    
    setClipping in class Control
  - setFocus
```
public boolean setFocus()
```
    Description copied from class: Control
    
    Causes the receiver to have the keyboard focus, such that all keyboard events will be delivered to it. Focus reassignment will respect applicable platform constraints.
    
    Overrides:
    
    setFocus in class Control
    
    Returns:
    true if the control got focus, and false if it was unable to.
    See Also:
    Control.forceFocus()
  - setFont
```
void setFont(int font,
           double size)
```
    Overrides:
    
    setFont in class Control
  - setForegroundBrush
```
void setForegroundBrush(int brush)
```
    Overrides:
    
    setForegroundBrush in class Control
  - setLayout
```
public void setLayout(Layout layout)
```
    Sets the layout which is associated with the receiver to be the argument which may be null.
    Parameters:
    layout - the receiver's new layout 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
  - setLayoutDeferred
```
public void setLayoutDeferred(boolean defer)
```
    If the argument is true, causes subsequent layout operations in the receiver or any of its children to be ignored. No layout of any kind can occur in the receiver or any of its children until the flag is set to false. Layout operations that occurred while the flag was true are remembered and when the flag is set to false, the layout operations are performed in an optimized manner. Nested calls to this method are stacked.
    Parameters:
    defer - the new defer state
    
    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:
    
    3.1
    
    See Also:
    layout(boolean), layout(Control[])
  - setTabList
```
public void setTabList(Control[] tabList)
```
    Sets the tabbing order for the specified controls to match the order that they occur in the argument list.
    Parameters:
    tabList - the ordered list of controls representing the tab order or null
    
    Throws:
    IllegalArgumentException -
    
    ERROR_INVALID_ARGUMENT - if a widget in the tabList is null or has been disposed
    
    ERROR_INVALID_PARENT - if widget in the tabList is not in the same widget tree
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - setTabGroupFocus
```
boolean setTabGroupFocus()
```
    Overrides:
    
    setTabGroupFocus in class Control
  - translateMnemonic
```
boolean translateMnemonic(Event event,
                        Control control)
```
    Overrides:
    
    translateMnemonic in class Control
  - traversalCode
```
int traversalCode(int key,
                int event)
```
    Overrides:
    
    traversalCode in class Control
  - translateTraversal
```
boolean translateTraversal(int msg)
```
    Overrides:
    
    translateTraversal in class Control
  - updateBackgroundColor
```
void updateBackgroundColor()
```
    Overrides:
    
    updateBackgroundColor in class Control
  - updateBackgroundImage
```
void updateBackgroundImage()
```
    Overrides:
    
    updateBackgroundImage in class Control
  - updateBackgroundMode
```
void updateBackgroundMode()
```
    Overrides:
    
    updateBackgroundMode in class Control
  - updateFont
```
void updateFont(Font oldFont,
              Font newFont)
```
    Overrides:
    
    updateFont in class Control
  - updateLayout
```
void updateLayout(boolean resize,
                boolean all)
```
    Overrides:
    
    updateLayout in class Control

Class Composite [ source ]

Field Summary

Fields inherited from class org.eclipse.swt.widgets.Scrollable

Fields inherited from class org.eclipse.swt.widgets.Control

Fields inherited from class org.eclipse.swt.widgets.Widget

Constructor Summary

Method Summary

Methods inherited from class org.eclipse.swt.widgets.Scrollable

Methods inherited from class org.eclipse.swt.widgets.Control

Methods inherited from class org.eclipse.swt.widgets.Widget

Methods inherited from class java.lang.Object

Field Detail

layout

tabList

layoutCount

backgroundMode

Constructor Detail

Composite

Composite

Method Detail

checkStyle

getCaretHandle

_getChildren

_getTabList

addChild

backgoundProperty

changed

checkSubclass

computeTabList

computeSize

createHandle

createHandle

defaultBackground

enableWidget

findDeferredControl

findMenus

fixScrollbarVisibility

fixTabList

getBackgroundMode

getChildren

getLayout

getLocation

getTabList

hooksKeys

getLayoutDeferred

HandlePreviewKeyDown

HandlePreviewMouseDown

HandlePreviewTextInput

isLayoutDeferred

isTabGroup

layout

layout

layout

layout

OnRender

markLayout

minimumSize

parentingHandle

releaseChildren

releaseWidget

removeChild

removeControl

resized

setAlpha

setBackgroundBrush

setBackgroundMode

setBounds

setClipping

setFocus

setFont

setForegroundBrush

setLayout

setLayoutDeferred

setTabList

setTabGroupFocus

translateMnemonic

traversalCode

translateTraversal

updateBackgroundColor

updateBackgroundImage