Class ToolItem


  • public class ToolItem
    extends Item
    Instances of this class represent a selectable user interface object that represents a button in a tool bar.
    Styles:
    PUSH, CHECK, RADIO, SEPARATOR, DROP_DOWN
    Events:
    Selection

    Note: Only one of the styles CHECK, PUSH, RADIO, SEPARATOR and DROP_DOWN may be specified.

    IMPORTANT: This class is not intended to be subclassed.

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

      • ToolItem

        public ToolItem​(ToolBar parent,
                        int style)
        Constructs a new instance of this class given its parent (which must be a ToolBar) and a style value describing its behavior and appearance. The item is added to the end of the items maintained by its parent.

        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.PUSH, SWT.CHECK, SWT.RADIO, SWT.SEPARATOR, SWT.DROP_DOWN, Widget.checkSubclass(), Widget.getStyle()
      • ToolItem

        public ToolItem​(ToolBar parent,
                        int style,
                        int index)
        Constructs a new instance of this class given its parent (which must be a ToolBar), a style value describing its behavior and appearance, and the index at which to place it in the items maintained by its parent.

        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
        index - the zero-relative index to store the receiver in its parent
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the parent is null
        • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)
        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.PUSH, SWT.CHECK, SWT.RADIO, SWT.SEPARATOR, SWT.DROP_DOWN, Widget.checkSubclass(), Widget.getStyle()
    • Method Detail

      • addSelectionListener

        public void addSelectionListener​(SelectionListener listener)
        Adds the listener to the collection of listeners who will be notified when the control is selected by the user, by sending it one of the messages defined in the SelectionListener interface.

        When widgetSelected is called when the mouse is over the arrow portion of a drop-down tool, the event object detail field contains the value SWT.ARROW. widgetDefaultSelected is not called.

        When the SWT.RADIO style bit is set, the widgetSelected method is also called when the receiver loses selection because another item in the same radio group was selected by the user. During widgetSelected the application can use getSelection() to determine the current selected state of the receiver.

        Parameters:
        listener - the listener which should be notified when the control is selected by the user,
        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:
        SelectionListener, removeSelectionListener(org.eclipse.swt.events.SelectionListener), SelectionEvent
      • 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 Item
      • getBounds

        public Rectangle getBounds()
        Returns a rectangle describing the receiver's size and location relative to its parent.
        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
      • getControl

        public Control getControl()
        Returns the control that is used to fill the bounds of the item when the item is a SEPARATOR.
        Returns:
        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
      • getDisabledImage

        public Image getDisabledImage()
        Returns the receiver's disabled image if it has one, or null if it does not.

        The disabled image is displayed when the receiver is disabled.

        Returns:
        the receiver's disabled 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
      • 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()
      • getHotImage

        public Image getHotImage()
        Returns the receiver's hot image if it has one, or null if it does not.

        The hot image is displayed when the mouse enters the receiver.

        Returns:
        the receiver's hot 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
      • getParent

        public ToolBar getParent()
        Returns the receiver's parent, which must be a ToolBar.
        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
      • getSelection

        public boolean getSelection()
        Returns true if the receiver is selected, and false otherwise.

        When the receiver is of type CHECK or RADIO, it is selected when it is checked (which some platforms draw as a pushed in button). If the receiver is of any other type, this method returns false.

        Returns:
        the selection 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
      • 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
      • getWidth

        public int getWidth()
        Gets the width of the receiver.
        Returns:
        the 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
      • isEnabled

        public boolean isEnabled()
        Returns true if the receiver is enabled and all of the receiver's ancestors are 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:
        getEnabled()
      • setControl

        public void setControl​(Control control)
        Sets the control that is used to fill the bounds of the item when the item is a SEPARATOR.
        Parameters:
        control - the new control
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the control has been disposed
        • ERROR_INVALID_PARENT - if the control 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
      • 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
      • setDisabledImage

        public void setDisabledImage​(Image image)
        Sets the receiver's disabled image to the argument, which may be null indicating that no disabled image should be displayed.

        The disabled image is displayed when the receiver is disabled.

        Parameters:
        image - the disabled image to display on the receiver (may be null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the image 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
      • setHotImage

        public void setHotImage​(Image image)
        Sets the receiver's hot image to the argument, which may be null indicating that no hot image should be displayed.

        The hot image is displayed when the mouse enters the receiver.

        Parameters:
        image - the hot image to display on the receiver (may be null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the image 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
      • setImage

        public void setImage​(Image image)
        Description copied from class: Item
        Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
        Overrides:
        setImage in class Item
        Parameters:
        image - the image to display on the receiver (may be null)
      • setSelection

        public void setSelection​(boolean selected)
        Sets the selection state of the receiver.

        When the receiver is of type CHECK or RADIO, it is selected when it is checked (which some platforms draw as a pushed in button).

        Parameters:
        selected - the new selection 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
      • setText

        public void setText​(String string)
        Sets the receiver's text. 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, a selection event occurs. 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.

        Overrides:
        setText in class Item
        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
      • setToolTipText

        public void setToolTipText​(String string)
        Sets the receiver's tool tip text to the argument, which may be null indicating that the default tool tip for the control will be shown. For a control that has a default tool tip, such as the Tree control on Windows, setting the tool tip text to an empty string replaces the default, causing no tool tip text to be shown.

        The mnemonic indicator (character '&') is not displayed in a tool tip. To display a single '&' in the tool tip, the character '&' can be escaped by doubling it in the string.

        NOTE: This operation is a hint and behavior is platform specific, on Windows for CJK-style mnemonics of the form " (&C)" at the end of the tooltip text are not shown in tooltip.

        Parameters:
        string - 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
      • setWidth

        public void setWidth​(int width)
        Sets the width of the receiver, for SEPARATOR ToolItems.
        Parameters:
        width - the new width. If the new value is SWT.DEFAULT, the width is a fixed-width area whose amount is determined by the platform. If the new value is 0 a vertical or horizontal line will be drawn, depending on the setting of the corresponding style bit (SWT.VERTICAL or SWT.HORIZONTAL). If the new value is SWT.SEPARATOR_FILL a variable-width space is inserted that acts as a spring between the two adjoining items which will push them out to the extent of the containing ToolBar.
        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