org.eclipse.swt.widgets
Class Control

java.lang.Object
  org.eclipse.swt.widgets.Widget
      org.eclipse.swt.widgets.Control

All Implemented Interfaces:

Adaptable, Drawable

Direct Known Subclasses:

Button, Label, Link, ProgressBar, Sash, Scale, Scrollable, Slider

public abstract class Control

extends Widget

implements Drawable

Control is the abstract superclass of all windowed user interface classes.

Styles:

BORDER

LEFT_TO_RIGHT

Events:

FocusIn, FocusOut, Help, KeyDown, KeyUp, MouseDoubleClick, MouseDown, MouseUp, Move, Resize, Traverse, MenuDetect

IMPORTANT: This class is intended to be subclassed only within the SWT implementation.

Since:

1.0

Constructor Summary

Control(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

void	addControlListener(ControlListener listener) Adds the listener to the collection of listeners who will be notified when the control is moved or resized, by sending it one of the messages defined in the ControlListener interface.
void	addDragDetectListener(DragDetectListener listener) Adds the listener to the collection of listeners who will be notified when a drag gesture occurs, by sending it one of the messages defined in the DragDetectListener interface.
void	addFocusListener(FocusListener listener) Adds the listener to the collection of listeners who will be notified when the control gains or loses focus, by sending it one of the messages defined in the FocusListener interface.
void	addGestureListener(GestureListener listener) Adds the listener to the collection of listeners who will be notified when gesture events are generated for the control, by sending it one of the messages defined in the GestureListener interface.
void	addHelpListener(HelpListener listener) Adds the listener to the collection of listeners who will be notified when help events are generated for the control, by sending it one of the messages defined in the HelpListener interface.
void	addKeyListener(KeyListener listener) Adds the listener to the collection of listeners who will be notified when keys are pressed and released on the system keyboard, by sending it one of the messages defined in the KeyListener interface.
void	addMenuDetectListener(MenuDetectListener listener) Adds the listener to the collection of listeners who will be notified when the platform-specific context menu trigger has occurred, by sending it one of the messages defined in the MenuDetectListener interface.
void	addMouseListener(MouseListener listener) Adds the listener to the collection of listeners who will be notified when mouse buttons are pressed and released, by sending it one of the messages defined in the MouseListener interface.
void	addTouchListener(TouchListener listener) Adds the listener to the collection of listeners who will be notified when touch events occur, by sending it one of the messages defined in the TouchListener interface.
void	addTraverseListener(TraverseListener listener) Adds the listener to the collection of listeners who will be notified when traversal events occur, by sending it one of the messages defined in the TraverseListener interface.
Point	computeSize(int wHint, int hHint) Returns the preferred size of the receiver.
Point	computeSize(int wHint, int hHint, boolean changed) Returns the preferred size of the receiver.
boolean	forceFocus() Forces the receiver to have the keyboard focus, causing all keyboard events to be delivered to it.
Accessible	getAccessible() Returns the accessible object for the receiver.
Object	getAdapter(Class adapter) Implementation of the Adaptable interface.
Color	getBackground() Returns the receiver's background color.
Image	getBackgroundImage() Returns the receiver's background image.
int	getBorderWidth() Returns the receiver's border width.
Rectangle	getBounds() Returns a rectangle describing the receiver's size and location relative to its parent (or its display if its parent is null), unless the receiver is a shell.
Cursor	getCursor() Returns the receiver's cursor, or null if it has not been set.
boolean	getEnabled() Returns true if the receiver is enabled, and false otherwise.
Font	getFont() Returns the font that the receiver will use to paint textual information.
Color	getForeground() Returns the foreground color that the receiver will use to draw.
Object	getLayoutData() Returns layout data which is associated with the receiver.
Point	getLocation() Returns a point describing the receiver's location relative to its parent (or its display if its parent is null), unless the receiver is a shell.
Menu	getMenu() Returns the receiver's pop up menu if it has one, or null if it does not.
Monitor	getMonitor() Returns the receiver's monitor.
int	getOrientation() Returns the orientation of the receiver, which will be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
Composite	getParent() Returns the receiver's parent, which must be a Composite or null when the receiver is a shell that was created with null or a display for a parent.
Shell	getShell() Returns the receiver's shell.
Point	getSize() Returns a point describing the receiver's size.
String	getToolTipText() Returns the receiver's tool tip text, or null if it has not been set.
boolean	getTouchEnabled() Returns true if this control is receiving OS-level touch events, otherwise false
boolean	getVisible() Returns true if the receiver is visible, and false otherwise.
boolean	isEnabled() Returns true if the receiver is enabled and all ancestors up to and including the receiver's nearest ancestor shell are enabled.
boolean	isFocusControl() Returns true if the receiver has the user-interface focus, and false otherwise.
boolean	isReparentable() Returns true if the underlying operating system supports this reparenting, otherwise false
boolean	isVisible() Returns true if the receiver is visible and all ancestors up to and including the receiver's nearest ancestor shell are visible.
void	moveAbove(Control control) Moves the receiver above the specified control in the drawing order.
void	moveBelow(Control control) Moves the receiver below the specified control in the drawing order.
void	pack() Causes the receiver to be resized to its preferred size.
void	pack(boolean changed) Causes the receiver to be resized to its preferred size.
void	redraw() Causes the entire bounds of the receiver to be marked as needing to be redrawn.
void	redraw(int x, int y, int width, int height, boolean all) Causes the rectangular area of the receiver specified by the arguments to be marked as needing to be redrawn.
void	removeControlListener(ControlListener listener) Removes the listener from the collection of listeners who will be notified when the control is moved or resized.
void	removeDragDetectListener(DragDetectListener listener) Removes the listener from the collection of listeners who will be notified when a drag gesture occurs.
void	removeFocusListener(FocusListener listener) Removes the listener from the collection of listeners who will be notified when the control gains or loses focus.
void	removeGestureListener(GestureListener listener) Removes the listener from the collection of listeners who will be notified when gesture events are generated for the control.
void	removeHelpListener(HelpListener listener) Removes the listener from the collection of listeners who will be notified when the help events are generated for the control.
void	removeKeyListener(KeyListener listener) Removes the listener from the collection of listeners who will be notified when keys are pressed and released on the system keyboard.
void	removeMenuDetectListener(MenuDetectListener listener) Removes the listener from the collection of listeners who will be notified when the platform-specific context menu trigger has occurred.
void	removeMouseListener(MouseListener listener) Removes the listener from the collection of listeners who will be notified when mouse buttons are pressed and released.
void	removeTouchListener(TouchListener listener) Removes the listener from the collection of listeners who will be notified when touch events occur.
void	removeTraverseListener(TraverseListener listener) Removes the listener from the collection of listeners who will be notified when traversal events occur.
void	setBackground(Color color) 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.
void	setBackgroundImage(Image image) Sets the receiver's background image to the image specified by the argument, or to the default system color for the control if the argument is null.
void	setBounds(int x, int y, int width, int height) Sets the receiver's size and location to the rectangular area specified by the arguments.
void	setBounds(Rectangle bounds) Sets the receiver's size and location to the rectangular area specified by the argument.
void	setCursor(Cursor cursor) 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.
void	setEnabled(boolean enabled) Enables the receiver if the argument is true, and disables it otherwise.
boolean	setFocus() Causes the receiver to have the keyboard focus, such that all keyboard events will be delivered to it.
void	setFont(Font font) Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.
void	setForeground(Color color) Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the control if the argument is null.
void	setLayoutData(Object layoutData) Sets the layout data associated with the receiver to the argument.
void	setLocation(int x, int y) Sets the receiver's location to the point specified by the arguments which are relative to the receiver's parent (or its display if its parent is null), unless the receiver is a shell.
void	setLocation(Point location) Sets the receiver's location to the point specified by the arguments which are relative to the receiver's parent (or its display if its parent is null), unless the receiver is a shell.
void	setMenu(Menu menu) Sets the receiver's pop up menu to the argument.
void	setOrientation(int orientation) Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
boolean	setParent(Composite parent) Changes the parent of the widget to be the one provided if the underlying operating system supports this feature.
void	setRedraw(boolean redraw) If the argument is false, causes subsequent drawing operations in the receiver to be ignored.
void	setSize(int width, int height) Sets the receiver's size to the point specified by the arguments.
void	setSize(Point size) Sets the receiver's size to the point specified by the argument.
void	setToolTipText(String toolTipText) Sets the receiver's tool tip text to the argument, which may be null indicating that no tool tip text should be shown.
void	setTouchEnabled(boolean enabled) Sets whether the receiver should accept touch events.
void	setVisible(boolean visible) Marks the receiver as visible if the argument is true, and marks it invisible otherwise.
Point	toControl(int x, int y) Returns a point which is the result of converting the argument, which is specified in display relative coordinates, to coordinates relative to the receiver.
Point	toControl(Point point) Returns a point which is the result of converting the argument, which is specified in display relative coordinates, to coordinates relative to the receiver.
Point	toDisplay(int x, int y) Returns a point which is the result of converting the argument, which is specified in coordinates relative to the receiver, to display relative coordinates.
Point	toDisplay(Point point) Returns a point which is the result of converting the argument, which is specified in coordinates relative to the receiver, to display relative coordinates.
void	update() Forces all outstanding paint requests for the widget to be processed before this method returns.

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

addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, reskin, setData, setData, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Control

public Control(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.BORDER, Widget.checkSubclass(), Widget.getStyle()

Method Detail

getParent

public Composite getParent()

Returns the receiver's parent, which must be a Composite or null when the receiver is a shell that was created with null or a display for a parent.

Returns:

the receiver's parent

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

getShell

public Shell getShell()

Returns the receiver's shell. For all controls other than shells, this simply returns the control's nearest ancestor shell. Shells return themselves, even if they are children of other shells.

Returns:

the receiver's shell

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:

getParent()

getMonitor

public Monitor getMonitor()

Returns the receiver's monitor.

Returns:

the receiver's monitor

Since:

1.2

setVisible

public void setVisible(boolean visible)

Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, marking it visible may not actually cause it to be displayed.

Parameters:

visible - the new visibility 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

isVisible

public boolean isVisible()

Returns true if the receiver is visible and all ancestors up to and including the receiver's nearest ancestor shell are visible. Otherwise, false is returned.

Returns:

the receiver's visibility 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

See Also:

getVisible()

getVisible

public boolean getVisible()

Returns true if the receiver is visible, and false otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, this method may still indicate that it is considered visible even though it may not actually be showing.

Returns:

the receiver's visibility 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

setEnabled

public void setEnabled(boolean enabled)

Enables the receiver if the argument is true, and disables it otherwise. A disabled control is typically not selectable from the user interface and draws with an inactive or "grayed" look.

Parameters:

enabled - the new enabled 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

getEnabled

public boolean getEnabled()

Returns true if the receiver is enabled, and false otherwise. A disabled control is typically not selectable from the user interface and draws with an inactive or "grayed" look.

Returns:

the receiver's enabled 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

See Also:

isEnabled()

isEnabled

public boolean isEnabled()

Returns true if the receiver is enabled and all ancestors up to and including the receiver's nearest ancestor shell are enabled. Otherwise, false is returned. A disabled control is typically not selectable from the user interface and draws with an inactive or "grayed" look.

Returns:

the receiver's enabled 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

See Also:

getEnabled()

setBackground

public void setBackground(Color color)

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.

Parameters:

color - the new color (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument 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

getBackground

public Color getBackground()

Returns the receiver's background color.

Returns:

the background color

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

setBackgroundImage

public void setBackgroundImage(Image image)

Sets the receiver's background image to the image specified by the argument, or to the default system color for the control if the argument is null. The background image is tiled to fill the available space.

Note: This operation is a hint and may be overridden by the platform. For example, on Windows the background of a Button cannot be changed.

Parameters:

image - the new image (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument 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:

1.1

getBackgroundImage

public Image getBackgroundImage()

Returns the receiver's background image.

Returns:

the background image

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:

1.1

setForeground

public void setForeground(Color color)

Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the control if the argument is null.

Parameters:

color - the new color (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument 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

getForeground

public Color getForeground()

Returns the foreground color that the receiver will use to draw.

Returns:

the receiver's foreground color

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

setFont

public void setFont(Font font)

Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.

Parameters:

font - the new font (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument 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

getFont

public Font getFont()

Returns the font that the receiver will use to paint textual information.

Returns:

the receiver's font

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)

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.

Parameters:

cursor - the new cursor (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument 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:

1.2

getCursor

public Cursor getCursor()

Returns the receiver's cursor, or null if it has not been set.

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

Returns:

the receiver's cursor 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

Since:

1.2

setFocus

public boolean setFocus()

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.

Returns:

true if the control got focus, and false if it was unable to.

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:

forceFocus()

forceFocus

public boolean forceFocus()

Forces the receiver to have the keyboard focus, causing all keyboard events to be delivered to it.

Returns:

true if the control got focus, and false if it was unable to.

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:

setFocus()

isFocusControl

public boolean isFocusControl()

Returns true if the receiver has the user-interface focus, and false otherwise.

Returns:

the receiver's focus 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

getBounds

public Rectangle getBounds()

Returns a rectangle describing the receiver's size and location relative to its parent (or its display if its parent is null), unless the receiver is a shell. In this case, the location is relative to the display.

Returns:

the receiver's bounding rectangle

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

setBounds

public void setBounds(Rectangle bounds)

Sets the receiver's size and location to the rectangular area specified by the argument. The x and y fields of the rectangle are relative to the receiver's parent (or its display if its parent is null).

Note: Attempting to set the width or height of the receiver to a negative number will cause that value to be set to zero instead.

Parameters:

bounds - the new bounds for the receiver

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

setBounds

public void setBounds(int x,
                      int y,
                      int width,
                      int height)

Sets the receiver's size and location to the rectangular area specified by the arguments. The x and y arguments are relative to the receiver's parent (or its display if its parent is null), unless the receiver is a shell. In this case, the x and y arguments are relative to the display.

Note: Attempting to set the width or height of the receiver to a negative number will cause that value to be set to zero instead.

Parameters:

x - the new x coordinate for the receiver

y - the new y coordinate for the receiver

width - the new width for the receiver

height - the new height for the receiver

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

setLocation

public void setLocation(Point location)

Sets the receiver's location to the point specified by the arguments which are relative to the receiver's parent (or its display if its parent is null), unless the receiver is a shell. In this case, the point is relative to the display.

Parameters:

location - the new location for the receiver

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

setLocation

public void setLocation(int x,
                        int y)

Sets the receiver's location to the point specified by the arguments which are relative to the receiver's parent (or its display if its parent is null), unless the receiver is a shell. In this case, the point is relative to the display.

Parameters:

x - the new x coordinate for the receiver

y - the new y coordinate for the receiver

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

public Point getLocation()

Returns a point describing the receiver's location relative to its parent (or its display if its parent is null), unless the receiver is a shell. In this case, the point is relative to the display.

Returns:

the receiver's location

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

setSize

public void setSize(Point size)

Sets the receiver's size to the point specified by the argument.

Note: Attempting to set the width or height of the receiver to a negative number will cause them to be set to zero instead.

Parameters:

size - the new size for the receiver

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the point is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setSize

public void setSize(int width,
                    int height)

Sets the receiver's size to the point specified by the arguments.

Note: Attempting to set the width or height of the receiver to a negative number will cause that value to be set to zero instead.

Parameters:

width - the new width for the receiver

height - the new height for the receiver

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

getSize

public Point getSize()

Returns a point describing the receiver's size. The x coordinate of the result is the width of the receiver. The y coordinate of the result is the height of the receiver.

Returns:

the receiver's size

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

computeSize

public Point computeSize(int wHint,
                         int hHint)

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.

Parameters:

wHint - the width hint (can be SWT.DEFAULT)

hHint - the height hint (can be SWT.DEFAULT)

Returns:

the preferred size of the control

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:

Layout, getBorderWidth(), getBounds(), getSize(), pack(boolean), "computeTrim, getClientArea for controls that implement them"

computeSize

public Point computeSize(int wHint,
                         int hHint,
                         boolean changed)

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.

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.

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:

Layout, getBorderWidth(), getBounds(), getSize(), pack(boolean), "computeTrim, getClientArea for controls that implement them"

pack

public void pack()

Causes the receiver to be resized to its preferred size. For a composite, this involves computing the preferred size from its layout, if there is one.

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:

computeSize(int, int, boolean)

pack

public void pack(boolean changed)

Causes the receiver to be resized to its preferred size. For a composite, this involves computing the preferred size from its layout, if there is one.

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.

Parameters:

changed - whether or not the receiver's contents have changed

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:

computeSize(int, int, boolean)

getBorderWidth

public int getBorderWidth()

Returns the receiver's border width.

Returns:

the border width

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

toControl

public Point toControl(int x,
                       int y)

Returns a point which is the result of converting the argument, which is specified in display relative coordinates, to coordinates relative to the receiver.

Parameters:

x - the x coordinate to be translated

y - the y coordinate to be translated

Returns:

the translated coordinates

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

toControl

public Point toControl(Point point)

Returns a point which is the result of converting the argument, which is specified in display relative coordinates, to coordinates relative to the receiver.

Parameters:

point - the point to be translated (must not be null)

Returns:

the translated coordinates

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the point is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

toDisplay

public Point toDisplay(int x,
                       int y)

Returns a point which is the result of converting the argument, which is specified in coordinates relative to the receiver, to display relative coordinates.

Parameters:

x - the x coordinate to be translated

y - the y coordinate to be translated

Returns:

the translated coordinates

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

toDisplay

public Point toDisplay(Point point)

Returns a point which is the result of converting the argument, which is specified in coordinates relative to the receiver, to display relative coordinates.

Parameters:

point - the point to be translated (must not be null)

Returns:

the translated coordinates

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the point is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getLayoutData

public Object getLayoutData()

Returns layout data which is associated with the receiver.

Returns:

the receiver's layout data

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

setLayoutData

public void setLayoutData(Object layoutData)

Sets the layout data associated with the receiver to the argument.

Parameters:

layoutData - the new layout data for the receiver.

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

setToolTipText

public void setToolTipText(String toolTipText)

Sets the receiver's tool tip text to the argument, which may be null indicating that no tool tip text should be shown.

Parameters:

toolTipText - the new tool tip text (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

getToolTipText

public String getToolTipText()

Returns the receiver's tool tip text, or null if it has not been set.

Returns:

the receiver's tool tip text

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

setMenu

public void setMenu(Menu menu)

Sets the receiver's pop up menu to the argument. All controls may optionally have a pop up menu that is displayed when the user requests one for the control. The sequence of key strokes, button presses and/or button releases that are used to request a pop up menu is platform specific.

Note: Disposing of a control that has a pop up menu will dispose of the menu. To avoid this behavior, set the menu to null before the control is disposed.

Parameters:

menu - the new pop up menu

Throws:

IllegalArgumentException -

• ERROR_MENU_NOT_POP_UP - the menu is not a pop up menu
• ERROR_INVALID_PARENT - if the menu is not in the same widget tree
• ERROR_INVALID_ARGUMENT - if the menu 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

getMenu

public Menu getMenu()

Returns the receiver's pop up menu if it has one, or null if it does not. All controls may optionally have a pop up menu that is displayed when the user requests one for the control. The sequence of key strokes, button presses and/or button releases that are used to request a pop up menu is platform specific.

Returns:

the receiver's menu

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

moveAbove

public void moveAbove(Control control)

Moves the receiver above the specified control in the drawing order. If the argument is null, then the receiver is moved to the top of the drawing order. The control at the top of the drawing order will not be covered by other controls even if they occupy intersecting areas.

Parameters:

control - the sibling control (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the control 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

See Also:

moveBelow(org.eclipse.swt.widgets.Control), Composite.getChildren()

moveBelow

public void moveBelow(Control control)

Moves the receiver below the specified control in the drawing order. If the argument is null, then the receiver is moved to the bottom of the drawing order. The control at the bottom of the drawing order will be covered by all other controls which occupy intersecting areas.

Parameters:

control - the sibling control (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the control 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

See Also:

moveAbove(org.eclipse.swt.widgets.Control), Composite.getChildren()

getAdapter

public Object getAdapter(Class adapter)

Description copied from class: Widget

Implementation of the Adaptable interface.

IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code.

Specified by:

getAdapter in interface Adaptable

Overrides:

getAdapter in class Widget

addControlListener

public void addControlListener(ControlListener listener)

Adds the listener to the collection of listeners who will be notified when the control is moved or resized, by sending it one of the messages defined in the ControlListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

ControlListener, removeControlListener(org.eclipse.swt.events.ControlListener)

removeControlListener

public void removeControlListener(ControlListener listener)

Removes the listener from the collection of listeners who will be notified when the control is moved or resized.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

ControlListener, addControlListener(org.eclipse.swt.events.ControlListener)

addMouseListener

public void addMouseListener(MouseListener listener)

Adds the listener to the collection of listeners who will be notified when mouse buttons are pressed and released, by sending it one of the messages defined in the MouseListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.1

See Also:

MouseListener, removeMouseListener(org.eclipse.swt.events.MouseListener)

removeMouseListener

public void removeMouseListener(MouseListener listener)

Removes the listener from the collection of listeners who will be notified when mouse buttons are pressed and released.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.1

See Also:

MouseListener, addMouseListener(org.eclipse.swt.events.MouseListener)

addKeyListener

public void addKeyListener(KeyListener listener)

Adds the listener to the collection of listeners who will be notified when keys are pressed and released on the system keyboard, by sending it one of the messages defined in the KeyListener interface.

Note: the key events in RWT are not meant for general purpose.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.2

See Also:

KeyListener, removeKeyListener(org.eclipse.swt.events.KeyListener)

removeKeyListener

public void removeKeyListener(KeyListener listener)

Removes the listener from the collection of listeners who will be notified when keys are pressed and released on the system keyboard.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.2

See Also:

KeyListener, addKeyListener(org.eclipse.swt.events.KeyListener)

addTraverseListener

public void addTraverseListener(TraverseListener listener)

Adds the listener to the collection of listeners who will be notified when traversal events occur, by sending it one of the messages defined in the TraverseListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.2

See Also:

TraverseListener, removeTraverseListener(org.eclipse.swt.events.TraverseListener)

removeTraverseListener

public void removeTraverseListener(TraverseListener listener)

Removes the listener from the collection of listeners who will be notified when traversal events occur.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.2

See Also:

TraverseListener, addTraverseListener(org.eclipse.swt.events.TraverseListener)

addFocusListener

public void addFocusListener(FocusListener listener)

Adds the listener to the collection of listeners who will be notified when the control gains or loses focus, by sending it one of the messages defined in the FocusListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

FocusListener, removeFocusListener(org.eclipse.swt.events.FocusListener)

removeFocusListener

public void removeFocusListener(FocusListener listener)

Removes the listener from the collection of listeners who will be notified when the control gains or loses focus.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

FocusListener, addFocusListener(org.eclipse.swt.events.FocusListener)

addHelpListener

public void addHelpListener(HelpListener listener)

Adds the listener to the collection of listeners who will be notified when help events are generated for the control, by sending it one of the messages defined in the HelpListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.3

See Also:

HelpListener, removeHelpListener(org.eclipse.swt.events.HelpListener)

removeHelpListener

public void removeHelpListener(HelpListener listener)

Removes the listener from the collection of listeners who will be notified when the help events are generated for the control.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.3

See Also:

HelpListener, addHelpListener(org.eclipse.swt.events.HelpListener)

addDragDetectListener

public void addDragDetectListener(DragDetectListener listener)

Adds the listener to the collection of listeners who will be notified when a drag gesture occurs, by sending it one of the messages defined in the DragDetectListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.3

See Also:

DragDetectListener, removeDragDetectListener(org.eclipse.swt.events.DragDetectListener)

removeDragDetectListener

public void removeDragDetectListener(DragDetectListener listener)

Removes the listener from the collection of listeners who will be notified when a drag gesture occurs.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.3

See Also:

DragDetectListener, addDragDetectListener(org.eclipse.swt.events.DragDetectListener)

addMenuDetectListener

public void addMenuDetectListener(MenuDetectListener listener)

Adds the listener to the collection of listeners who will be notified when the platform-specific context menu trigger has occurred, by sending it one of the messages defined in the MenuDetectListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.3

See Also:

MenuDetectListener, removeMenuDetectListener(org.eclipse.swt.events.MenuDetectListener)

removeMenuDetectListener

public void removeMenuDetectListener(MenuDetectListener listener)

Removes the listener from the collection of listeners who will be notified when the platform-specific context menu trigger has occurred.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.3

See Also:

MenuDetectListener, addMenuDetectListener(org.eclipse.swt.events.MenuDetectListener)

setRedraw

public void setRedraw(boolean redraw)

If the argument is false, causes subsequent drawing operations in the receiver to be ignored. No drawing of any kind can occur in the receiver until the flag is set to true. Graphics operations that occurred while the flag was false are lost. When the flag is set to true, the entire widget is marked as needing to be redrawn. Nested calls to this method are stacked.

Note: This operation is a hint and may not be supported on some platforms or for some widgets.

Note: With RAP we can't really force a redraw. This is just a fake to enable event notifications that come on OS systems with redraws.

Parameters:

redraw - the new redraw 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

redraw

public void redraw()

Causes the entire bounds of the receiver to be marked as needing to be redrawn.

Note: With RAP we can't really force a redraw. This is just a fake to enable event notifications that come on OS systems with redraws.

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

redraw

public void redraw(int x,
                   int y,
                   int width,
                   int height,
                   boolean all)

Causes the rectangular area of the receiver specified by the arguments to be marked as needing to be redrawn. The next time a paint request is processed, that area of the receiver will be painted, including the background. If the all flag is true, any children of the receiver which intersect with the specified area will also paint their intersecting areas. If the all flag is false, the children will not be painted.

Parameters:

x - the x coordinate of the area to draw

y - the y coordinate of the area to draw

width - the width of the area to draw

height - the height of the area to draw

all - true if children should redraw, 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:

1.3

See Also:

update(), PaintListener, SWT#Paint, SWT.NO_BACKGROUND, SWT.NO_REDRAW_RESIZE, SWT.NO_MERGE_PAINTS, SWT.DOUBLE_BUFFERED

update

public void update()

Forces all outstanding paint requests for the widget to be processed before this method returns. If there are no outstanding paint request, this method does nothing.

Note: This method does not cause a redraw.

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:

1.3

setParent

public boolean setParent(Composite parent)

Changes the parent of the widget to be the one provided if the underlying operating system supports this feature. Returns true if the parent is successfully changed.

Parameters:

parent - the new parent for the control.

Returns:

true if the parent is changed and false otherwise.

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed
• ERROR_NULL_ARGUMENT - if the parent is null

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:

1.3

isReparentable

public boolean isReparentable()

Returns true if the underlying operating system supports this reparenting, otherwise false

Returns:

true if the widget can be reparented, otherwise false

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:

1.3

setOrientation

public void setOrientation(int orientation)

Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.

Note: Currently RWT does not support SWT.RIGHT_TO_LEFT.

Parameters:

orientation - new orientation style

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:

1.4

getOrientation

public int getOrientation()

Returns the orientation of the receiver, which will be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.

Note: Currently RWT does not support SWT.RIGHT_TO_LEFT.

Returns:

the orientation style

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:

1.4

getAccessible

public Accessible getAccessible()

Returns the accessible object for the receiver.

If this is the first time this object is requested, then the object is created and returned. The object returned by getAccessible() does not need to be disposed.

Returns:

the accessible object

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:

1.4

See Also:

Accessible.addAccessibleListener(org.eclipse.swt.accessibility.AccessibleListener), Accessible.addAccessibleControlListener(org.eclipse.swt.accessibility.AccessibleControlListener)

addGestureListener

public void addGestureListener(GestureListener listener)

Adds the listener to the collection of listeners who will be notified when gesture events are generated for the control, by sending it one of the messages defined in the GestureListener interface.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.4

See Also:

GestureListener, removeGestureListener(org.eclipse.swt.events.GestureListener)

removeGestureListener

public void removeGestureListener(GestureListener listener)

Removes the listener from the collection of listeners who will be notified when gesture events are generated for the control.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.4

See Also:

GestureListener, addGestureListener(org.eclipse.swt.events.GestureListener)

addTouchListener

public void addTouchListener(TouchListener listener)

Adds the listener to the collection of listeners who will be notified when touch events occur, by sending it one of the messages defined in the TouchListener interface.

NOTE: You must also call setTouchEnabled to notify the windowing toolkit that you want touch events to be generated.

Parameters:

listener - the listener which should be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.4

See Also:

TouchListener, removeTouchListener(org.eclipse.swt.events.TouchListener)

removeTouchListener

public void removeTouchListener(TouchListener listener)

Removes the listener from the collection of listeners who will be notified when touch events occur.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

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:

1.4

See Also:

TouchListener, addTouchListener(org.eclipse.swt.events.TouchListener)

setTouchEnabled

public void setTouchEnabled(boolean enabled)

Sets whether the receiver should accept touch events. By default, a Control does not accept touch events. No error or exception is thrown if the underlying hardware does not support touch input.

Parameters:

enabled - the new touch-enabled 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:
1.4

getTouchEnabled

public boolean getTouchEnabled()

Returns true if this control is receiving OS-level touch events, otherwise false

Note that this method will return false if the current platform does not support touch-based input. If this method does return true, gesture events will not be sent to the control.

Returns:

true if the widget is currently receiving touch events; 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:

1.4