Class Group

  • All Implemented Interfaces:
    Drawable

    public class Group
    extends Composite
    Instances of this class provide an etched border with an optional title.

    Shadow styles are hints and may not be honoured by the platform. To create a group with the default shadow style for the platform, do not specify a shadow style.

    Styles:
    SHADOW_ETCHED_IN, SHADOW_ETCHED_OUT, SHADOW_IN, SHADOW_OUT, SHADOW_NONE
    Events:
    (none)

    Note: Only one of the above styles may be specified.

    IMPORTANT: This class is not intended to be subclassed.

    See Also:
    SWT Example: ControlExample, Sample code and further information
    Restriction:
    This class is not intended to be subclassed by clients.
    • Constructor Detail

      • Group

        public Group​(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.SHADOW_ETCHED_IN, SWT.SHADOW_ETCHED_OUT, SWT.SHADOW_IN, SWT.SHADOW_OUT, SWT.SHADOW_NONE, Widget.checkSubclass(), Widget.getStyle()
    • Method Detail

      • 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 Composite
      • getText

        public String getText()
        Returns the receiver's text, which is the string that the is used as the title. If the text has not previously been set, returns an empty string.
        Returns:
        the 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
      • setFont

        public void setFont​(Font font)
        Description copied from class: Control
        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.
        Overrides:
        setFont in class Control
        Parameters:
        font - the new font (or null)
      • setText

        public void setText​(String string)
        Sets the receiver's text, which is the string that will be displayed as the receiver's title, to the argument, which may not be null. The string may include the mnemonic character.

        Mnemonics are indicated by an '&' that causes the next character to be the mnemonic. When the user presses a key sequence that matches the mnemonic, focus is assigned to the first child of the group. On most platforms, the mnemonic appears underlined but may be emphasised in a platform specific manner. The mnemonic indicator character '&' can be escaped by doubling it in the string, causing a single '&' to be displayed.

        Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

        Parameters:
        string - the new text
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the text 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