Class Group

  • All Implemented Interfaces:
    Adaptable, 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.

    The various SHADOW_* styles are not yet implemented.


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

    IMPORTANT: This class is not intended to be subclassed.

    Note: The styles SHADOW_XXX are not yet implemented in RWT.
    • 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.

        The various SHADOW_* styles are not yet implemented.

        parent - a composite control which will be the parent of the new instance (cannot be null)
        style - the style of control to construct
        java.lang.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_IN, SWT.SHADOW_OUT, SWT.SHADOW_NONE, Widget.checkSubclass(), Widget.getStyle()
    • Method Detail

      • setText

        public void setText​(java.lang.String text)
        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.

        text - the new text
        java.lang.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
      • getText

        public java.lang.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.
        the text
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      • 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).

        computeTrim in class Scrollable
        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
        the required bounds to produce the given client area
        See Also:
      • computeSize

        public Point computeSize​(int wHint,
                                 int hHint,
                                 boolean changed)
        Description copied from class: Control
        Returns the preferred size of the receiver.

        The preferred size of a control is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the control need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.

        If the changed flag is true, it indicates that the receiver's contents have changed, therefore any caches that a layout manager containing the control may have been keeping need to be flushed. When the control is resized, the changed flag will be false, so layout manager caches can be retained.

        computeSize in class Composite
        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
        the preferred size of the control.
        See Also:
        Layout, Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"
      • getAdapter

        public <T> T getAdapter​(java.lang.Class<T> 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
        getAdapter in class Composite
        adapter - the lookup class
        an object that can be cast to the given class or null if there is no adapter associated with the given class.