Package org.eclipse.swt.custom

Class ViewForm

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Control

org.eclipse.swt.widgets.Scrollable

org.eclipse.swt.widgets.Composite

org.eclipse.swt.custom.ViewForm

All Implemented Interfaces:

Adaptable, Drawable

public class ViewForm
extends Composite

Instances of this class implement a Composite that positions and sizes children and allows programmatic control of layout and border parameters. ViewForm is used in the workbench to lay out a view's label/menu/toolbar local bar.

Note that although this class is a subclass of Composite, it does not make sense to set a layout on it.

Styles:

BORDER, FLAT

Events:

(None)

IMPORTANT: This class is not intended to be subclassed.

Field Summary

Fields

Modifier and Type	Field	Description
int	horizontalSpacing	horizontalSpacing specifies the number of pixels between the right edge of one cell and the left edge of its neighbouring cell to the right.
int	marginHeight	marginHeight specifies the number of pixels of vertical margin that will be placed along the top and bottom edges of the form.
int	marginWidth	marginWidth specifies the number of pixels of horizontal margin that will be placed along the left and right edges of the form.
int	verticalSpacing	verticalSpacing specifies the number of pixels between the bottom edge of one cell and the top edge of its neighbouring cell underneath.

Constructor Summary

Constructors

Constructor	Description
ViewForm(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

Modifier and Type	Method	Description
protected void	checkSubclass()	Checks that this class can be subclassed.
Rectangle	computeTrim(int x, int y, int width, int height)	Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.
Rectangle	getClientArea()	Returns a rectangle which describes the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings").
Control	getContent()	Returns the content area.
Control	getTopCenter()	Returns Control that appears in the top center of the pane.
Control	getTopLeft()	Returns the Control that appears in the top left corner of the pane.
Control	getTopRight()	Returns the control in the top right corner of the pane.
void	setBorderVisible(boolean show)	Specify whether the border should be displayed or not.
void	setContent(Control content)	Sets the content.
void	setLayout(Layout layout)	Sets the layout which is associated with the receiver to be the argument which may be null.
void	setTopCenter(Control topCenter)	Set the control that appears in the top center of the pane.
void	setTopCenterSeparate(boolean show)	If true, the topCenter will always appear on a separate line by itself, otherwise the topCenter will appear in the top row if there is room and will be moved to the second row if required.
void	setTopLeft(Control c)	Set the control that appears in the top left corner of the pane.
void	setTopRight(Control c)	Set the control that appears in the top right corner of the pane.

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

changed, computeSize, getAdapter, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayoutDeferred, setTabList

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

getHorizontalBar, getVerticalBar

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

addControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addTouchListener, addTraverseListener, computeSize, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getShell, getSize, getToolTipText, getTouchEnabled, getVisible, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeTouchListener, removeTraverseListener, requestLayout, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setData, setEnabled, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setSize, setSize, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, update

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

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

Methods inherited from class java.lang.Object

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

Field Details

marginWidth

public int marginWidth

marginWidth specifies the number of pixels of horizontal margin that will be placed along the left and right edges of the form. The default value is 0.

marginHeight

public int marginHeight

marginHeight specifies the number of pixels of vertical margin that will be placed along the top and bottom edges of the form. The default value is 0.

horizontalSpacing

public int horizontalSpacing

horizontalSpacing specifies the number of pixels between the right edge of one cell and the left edge of its neighbouring cell to the right. The default value is 1.

verticalSpacing

public int verticalSpacing

verticalSpacing specifies the number of pixels between the bottom edge of one cell and the top edge of its neighbouring cell underneath. The default value is 1.

Constructor Details

ViewForm

public ViewForm(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.BORDER
• SWT.FLAT
• Widget.getStyle()

Method Details

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

computeTrim

public Rectangle computeTrim(int x,
 int y,
 int width,
 int height)

Description copied from class: Scrollable

Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.

In other words, it returns a rectangle such that, if the receiver's bounds were set to that rectangle, the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings") would be the rectangle described by the arguments (relative to the receiver's parent).

Overrides:

computeTrim in class Scrollable

Parameters:

x - the desired x coordinate of the client area

y - the desired y coordinate of the client area

width - the desired width of the client area

height - the desired height of the client area

Returns:

the required bounds to produce the given client area

See Also:

• Scrollable.getClientArea()

getClientArea

public Rectangle getClientArea()

Description copied from class: Scrollable

Returns a rectangle which describes the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings").

Overrides:

getClientArea in class Scrollable

Returns:

the client area

See Also:

• Scrollable.computeTrim(int, int, int, int)

getContent

public Control getContent()

Returns the content area.

Returns:

the control in the content area of the pane or null

getTopCenter

public Control getTopCenter()

Returns Control that appears in the top center of the pane. Typically this is a toolbar.

Returns:

the control in the top center of the pane or null

getTopLeft

public Control getTopLeft()

Returns the Control that appears in the top left corner of the pane. Typically this is a label such as CLabel.

Returns:

the control in the top left corner of the pane or null

getTopRight

public Control getTopRight()

Returns the control in the top right corner of the pane. Typically this is a Close button or a composite with a Menu and Close button.

Returns:

the control in the top right corner of the pane or null

setContent

public void setContent(Control content)

Sets the content. Setting the content to null will remove it from the pane - however, the creator of the content must dispose of the content.

Parameters:

content - the control to be displayed in the content area 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
• ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm

setLayout

public void setLayout(Layout layout)

Sets the layout which is associated with the receiver to be the argument which may be null.

Note: No Layout can be set on this Control because it already manages the size and position of its children.

Overrides:

setLayout in class Composite

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

setTopCenter

public void setTopCenter(Control topCenter)

Set the control that appears in the top center of the pane. Typically this is a toolbar. The topCenter is optional. Setting the topCenter to null will remove it from the pane - however, the creator of the topCenter must dispose of the topCenter.

Parameters:

topCenter - the control to be displayed in the top center 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
• ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm

setTopLeft

public void setTopLeft(Control c)

Set the control that appears in the top left corner of the pane. Typically this is a label such as CLabel. The topLeft is optional. Setting the top left control to null will remove it from the pane - however, the creator of the control must dispose of the control.

Parameters:

c - the control to be displayed in the top left corner 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
• ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm

setTopRight

public void setTopRight(Control c)

Set the control that appears in the top right corner of the pane. Typically this is a Close button or a composite with a Menu and Close button. The topRight is optional. Setting the top right control to null will remove it from the pane - however, the creator of the control must dispose of the control.

Parameters:

c - the control to be displayed in the top right corner 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
• ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm

setBorderVisible

public void setBorderVisible(boolean show)

Specify whether the border should be displayed or not.

Parameters:

show - true if the border should be displayed

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

setTopCenterSeparate

public void setTopCenterSeparate(boolean show)

If true, the topCenter will always appear on a separate line by itself, otherwise the topCenter will appear in the top row if there is room and will be moved to the second row if required.

Parameters:

show - true if the topCenter will always appear on a separate line by itself

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