Class Composite

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, Canvas, CBanner, CCombo, Combo, CoolBar, CTabFolder, DateTime, ExpandBar, Group, SashForm, ScrolledComposite, Spinner, TabFolder, Table, ToolBar, Tree, ViewForm
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), 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:

  • Field Details

    • embeddedHandle

      public long embeddedHandle
      the handle to the OS resource (Warning: This field is platform dependent)

      IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.

    • imHandle

      long imHandle

    • socketHandle

      long socketHandle

    • layout

      Layout layout

    • tabList

      Control[] tabList

    • layoutCount

      int layoutCount

    • backgroundMode

      int backgroundMode

    • fixClipHandle

      long fixClipHandle
      When this field is set, it indicates that a child widget of this Composite needs to have its clip set to its allocation. This is because on GTK3.20+ some widgets (like Combo) have their clips merged with that of their parent.

    • fixClipMap

      Map<Control,long[]> fixClipMap
      If fixClipHandle is set, then the fixClipMap HashMap contains children of fixClipHandle that also need to have their clips adjusted.

      Each key is a Control which needs to have its clip adjusted, and each value is an array of handles (descendants of the Control) ordered by widget hierarchy. This array will be traversed in-order to adjust the clipping of each element. See bug 500703 and 535323.

    • NO_INPUT_METHOD

      static final String NO_INPUT_METHOD
      See Also:

    • popupChild

      Shell popupChild

    • noChildDrawing

      boolean noChildDrawing
      If set to true, child widgets with negative y coordinate GTK allocation will not be drawn. Only relevant if such child widgets are being drawn via propagateDraw(), such as Tree/Table editing widgets. See bug 535978 and bug 547986.

    • childrenLowered

      HashMap<Widget,Boolean> childrenLowered
      A HashMap of child widgets that keeps track of which child has had their GdkWindow lowered/raised. Only relevant if such child widgets are being drawn via propagateDraw(), such as Tree/Table editing widgets. See bug 535978.

  • Constructor Details

    • Composite

      Composite()

    • 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:

  • Method Details

    • checkStyle

      static int checkStyle(int style)

    • _getChildren

      Control[] _getChildren()

    • _getTabList

      Control[] _getTabList()

    • changed

      @Deprecated public void changed(Control[] changed)
      Deprecated.
      use layout(Control[], int) instead
      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

    • checkBuffered

      void checkBuffered()
      Overrides:
      checkBuffered in class Control

    • 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

    • computeSizeInPixels

      Point computeSizeInPixels(int wHint, int hHint, boolean changed)
      Overrides:
      computeSizeInPixels in class Control

    • computeTabList

      Widget[] computeTabList()
      Overrides:
      computeTabList in class Control

    • createHandle

      void createHandle(int index)
      Overrides:
      createHandle in class Widget

    • applyThemeBackground

      int applyThemeBackground()
      Overrides:
      applyThemeBackground in class Scrollable
      Returns:
    • 0 to remove THEME_BACKGROUND
    • 1 to apply THEME_BACKGROUND
    • otherwise don't change THEME_BACKGROUND state

    • createHandle

      void createHandle(int index, boolean fixed, boolean scrolled)

    • fixClippings

      void fixClippings()
      Iterates though the array of child widgets that need to have their clips adjusted, and calls Control.adjustChildClipping() on it. The default implementation in Composite is: if a child has a negative clip, adjust it. Also check if the child's allocation is negative, and adjust it as necessary.

      If the array is empty this method just returns. See bug 500703, and 539367.

    • adjustChildClipping

      void adjustChildClipping(long widget)
      Description copied from class: Control
      Allows Controls to adjust the clipping of themselves or their children.
      Overrides:
      adjustChildClipping in class Control
      Parameters:
      widget - the handle to the widget

    • gtk_draw

      long gtk_draw(long widget, long cairo)
      Overrides:
      gtk_draw in class Scrollable

    • mustBeVisibleOnInitBounds

      boolean mustBeVisibleOnInitBounds()
      Description copied from class: Control
      Widgets with unusual bounds calculation behavior can override this method to return true if the widget must be visible during call to Control.setInitialBounds().
      Overrides:
      mustBeVisibleOnInitBounds in class Control
      Returns:
      false by default on modern GTK 3 versions (3.20+).

    • deregister

      void deregister()
      Overrides:
      deregister in class Scrollable

    • drawBackground

      public void drawBackground(GC gc, int x, int y, int width, int height, int offsetX, int offsetY)
      Fills the interior of the rectangle specified by the arguments, with the receiver's background.

      The offsetX and offsetY are used to map from the gc origin to the origin of the parent image background. This is useful to ensure proper alignment of the image background.

      Parameters:
      gc - the gc where the rectangle is to be filled
      x - the x coordinate of the rectangle to be filled
      y - the y coordinate of the rectangle to be filled
      width - the width of the rectangle to be filled
      height - the height of the rectangle to be filled
      offsetX - the image background x offset
      offsetY - the image background y offset
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the gc is null
      • ERROR_INVALID_ARGUMENT - if the gc has been 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
      Since:
      3.6

    • enableWidget

      void enableWidget(boolean enabled)
      Overrides:
      enableWidget in class Control

    • findDeferredControl

      Composite findDeferredControl()

    • findMenus

      Menu[] findMenus(Control control)
      Overrides:
      findMenus in class Control

    • fixChildren

      void fixChildren(Shell newShell, Shell oldShell, Decorations newDecorations, Decorations oldDecorations, Menu[] menus)
      Overrides:
      fixChildren in class Control

    • fixParentGdkResource

      void fixParentGdkResource()
      Description copied from class: Control
      In some situations, a control has a non-standard parent GdkWindow (Note gDk, not gTk). E.g, an TreeEditor who's parent is a Tree should have the Tree Viewer's inner bin as parent window. Note, composites should treat this differently and take child controls into consideration.
      Overrides:
      fixParentGdkResource in class Control

    • fixModal

      void fixModal(long group, long modalGroup)
      Overrides:
      fixModal in class Control

    • fixStyle

      void fixStyle()
      Overrides:
      fixStyle in class Control

    • fixTabList

      void fixTabList(Control control)

    • fixZOrder

      void fixZOrder()

    • focusHandle

      long focusHandle()
      Overrides:
      focusHandle in class Control

    • forceFocus

      boolean forceFocus(long focusHandle)
      Overrides:
      forceFocus in class 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, INHERIT_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:

    • 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:

    • getChildrenCount

      int getChildrenCount()

    • getClientAreaInPixels

      Rectangle getClientAreaInPixels()
      Overrides:
      getClientAreaInPixels in class Scrollable

    • 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

    • 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:

    • 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:

    • gtk_button_press_event

      long gtk_button_press_event(long widget, long event)
      Overrides:
      gtk_button_press_event in class Control

    • gtk4_key_press_event

      boolean gtk4_key_press_event(long controller, int keyval, int keycode, int state, long event)
      Overrides:
      gtk4_key_press_event in class Control
      Parameters:
      controller - the corresponding controller responsible for capturing the event
      keyval - the pressed key
      keycode - raw code of the pressed key
      state - the bitmask, representing the state of the modifier keys and pointer buttons
      event - the GdkEvent captured
      Returns:
      TRUE if the event has been fully/properly handled, otherwise FALSE

    • gtk3_key_press_event

      long gtk3_key_press_event(long widget, long event)
      Overrides:
      gtk3_key_press_event in class Control

    • gtk_focus

      long gtk_focus(long widget, long directionType)
      Overrides:
      gtk_focus in class Control

    • gtk_focus_in_event

      long gtk_focus_in_event(long widget, long event)
      Overrides:
      gtk_focus_in_event in class Control

    • gtk_focus_out_event

      long gtk_focus_out_event(long widget, long event)
      Overrides:
      gtk_focus_out_event in class Control

    • gtk_map

      long gtk_map(long widget)
      Overrides:
      gtk_map in class Widget

    • gtk_realize

      long gtk_realize(long widget)
      Overrides:
      gtk_realize in class Control

    • gtk_scroll_child

      long gtk_scroll_child(long widget, long scrollType, long horizontal)
      Overrides:
      gtk_scroll_child in class Widget

    • gtk_style_updated

      long gtk_style_updated(long widget)
      Overrides:
      gtk_style_updated in class Control

    • hasBorder

      boolean hasBorder()

    • hookEvents

      void hookEvents()
      Overrides:
      hookEvents in class Control

    • hooksKeys

      boolean hooksKeys()

    • imHandle

      long imHandle()
      Overrides:
      imHandle 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:

    • 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.

      Use of this method is discouraged since it is the least-efficient way to trigger a layout. The use of layout(true) discards all cached layout information, even from controls which have not changed. It is much more efficient to invoke Control.requestLayout() on every control which has changed in the layout than it is to invoke this method on the layout itself.

      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.

      It is normally more efficient to invoke Control.requestLayout() on every control which has changed in the layout than it is to invoke this method on the layout itself. Clients are encouraged to use Control.requestLayout() where possible instead of calling this method.

      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)).

      It is normally more efficient to invoke Control.requestLayout() on every control which has changed in the layout than it is to invoke this method on the layout itself. Clients are encouraged to use Control.requestLayout() where possible instead of calling this method.

      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.

      It is normally more efficient to invoke Control.requestLayout() on every control which has changed in the layout than it is to invoke this method on the layout itself. Clients are encouraged to use Control.requestLayout() where possible instead of calling this method.

      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

    • layout

      public void layout(Control[] changed, int flags)
      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 parameter flags may be a combination of:

      SWT.ALL
      all children in the receiver's widget tree should be laid out
      SWT.CHANGED
      the layout must flush its caches
      SWT.DEFER
      layout will be deferred

      When the changed array is specified, the flags SWT.ALL and SWT.CHANGED have no effect. In this case, 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.

      When the changed array is not specified, the flag SWT.ALL indicates that the whole widget tree should be laid out. And the flag SWT.CHANGED indicates that the layouts should flush any cached information for all controls that are laid out.

      The SWT.DEFER flag always causes the layout to be deferred by calling Composite.setLayoutDeferred(true) and scheduling a call to Composite.setLayoutDeferred(false), which will happen when appropriate (usually before the next event is handled). When this flag is set, the application should not call Composite.setLayoutDeferred(boolean).

      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
      flags - the flags specifying how the layout should happen
      Throws:
      IllegalArgumentException -
      • ERROR_INVALID_ARGUMENT - if any of the controls in changed is null or has 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:
      3.6

    • markLayout

      void markLayout(boolean changed, boolean all)
      Overrides:
      markLayout in class Control

    • moveAbove

      void moveAbove(long child, long sibling)

    • moveBelow

      void moveBelow(long child, long sibling)

    • moveChildren

      void moveChildren(int oldWidth)
      Overrides:
      moveChildren in class Control

    • minimumSize

      Point minimumSize(int wHint, int hHint, boolean changed)

    • parentingHandle

      long parentingHandle()

    • printWidget

      void printWidget(GC gc, long drawable, int depth, int x, int y)
      Overrides:
      printWidget in class Control

    • connectFixedHandleDraw

      void connectFixedHandleDraw()
      Connects this widget's fixedHandle to the "draw" signal.
      NOTE: only the "draw" (EXPOSE) signal is connected, not EXPOSE_EVENT_INVERSE.

    • propagateDraw

      void propagateDraw(long container, long cairo)

      Propagates draw events from a parent container to its children using gtk_container_propagate_draw(). This method only works if the fixedHandle has been connected to the "draw" signal, and only propagates draw events to other siblings of handle (i.e. other children of fixedHandle, but not handle itself).

      It's useful to propagate draw events to other child widgets for things like Table/Tree editors, or other scenarios where a widget is a child of a non-standard container widget (i.e., not a direct child of a Composite).

      Parameters:
      container - the parent container, i.e. fixedHandle
      cairo - the cairo context provided by GTK

    • redrawChildren

      void redrawChildren()
      Overrides:
      redrawChildren in class Control

    • register

      void register()
      Overrides:
      register in class Scrollable

    • releaseChildren

      void releaseChildren(boolean destroy)
      Overrides:
      releaseChildren in class Scrollable

    • releaseHandle

      void releaseHandle()
      Overrides:
      releaseHandle in class Scrollable

    • releaseWidget

      void releaseWidget()
      Overrides:
      releaseWidget in class Control

    • removeControl

      void removeControl(Control control)

    • reskinChildren

      void reskinChildren(int flags)
      Overrides:
      reskinChildren in class Scrollable

    • resizeHandle

      void resizeHandle(int width, int height)
      Overrides:
      resizeHandle in class Scrollable

    • 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:

    • setBounds

      int setBounds(int x, int y, int width, int height, boolean move, boolean resize)
      Overrides:
      setBounds 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:

    • 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:

    • setOrientation

      void setOrientation(boolean create)
      Overrides:
      setOrientation in class Scrollable

    • setScrollBarVisible

      boolean setScrollBarVisible(ScrollBar bar, boolean visible)
      Overrides:
      setScrollBarVisible in class Scrollable

    • setTabGroupFocus

      boolean setTabGroupFocus(boolean next)
      Overrides:
      setTabGroupFocus in class Widget

    • setTabItemFocus

      boolean setTabItemFocus(boolean next)
      Overrides:
      setTabItemFocus in class 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

    • showWidget

      void showWidget()
      Overrides:
      showWidget in class Scrollable

    • checkSubwindow

      boolean checkSubwindow()
      Overrides:
      checkSubwindow in class Control

    • translateMnemonic

      boolean translateMnemonic(Event event, Control control)
      Overrides:
      translateMnemonic in class Control

    • traversalCode

      int traversalCode(int key, long event)
      Overrides:
      traversalCode in class Control

    • translateTraversal

      boolean translateTraversal(long event)
      Overrides:
      translateTraversal in class Control

    • updateBackgroundMode

      void updateBackgroundMode()
      Overrides:
      updateBackgroundMode in class Scrollable

    • updateLayout

      void updateLayout(boolean all)
      Overrides:
      updateLayout in class Control

    • toString

      public String toString()
      Description copied from class: Widget
      Returns a string containing a concise, human-readable description of the receiver.
      Overrides:
      toString in class Widget
      Returns:
      a string representation of the receiver