Package org.eclipse.swt.widgets

Class Label

java.lang.Object
org.eclipse.swt.widgets.Widget
org.eclipse.swt.widgets.Control
org.eclipse.swt.widgets.Label
All Implemented Interfaces:
Drawable
public class Label extends Control
Instances of this class represent a non-selectable user interface object that displays a string or image. When SEPARATOR is specified, displays a single vertical or horizontal line.

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

Styles:
SEPARATOR, HORIZONTAL, VERTICAL
SHADOW_IN, SHADOW_OUT, SHADOW_NONE
CENTER, LEFT, RIGHT, WRAP
Events:
(none)

Note: Only one of SHADOW_IN, SHADOW_OUT and SHADOW_NONE may be specified. SHADOW_NONE is a HINT. Only one of HORIZONTAL and VERTICAL may be specified. Only one of CENTER, LEFT and RIGHT may be specified.

IMPORTANT: This class is not intended to be subclassed.

See Also:
Restriction:
This class is not intended to be subclassed by clients.

  • Constructor Details

    • Label

      public Label(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:

  • Method Details

    • getAlignment

      public int getAlignment()
      Returns a value which describes the position of the text or image in the receiver. The value will be one of LEFT, RIGHT or CENTER unless the receiver is a SEPARATOR label, in which case, NONE is returned.
      Returns:
      the alignment
      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

    • getImage

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

    • getText

      public String getText()
      Returns the receiver's text, which will be an empty string if it has never been set or if the receiver is a SEPARATOR label.
      Returns:
      the receiver's 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

    • setAlignment

      public void setAlignment(int alignment)
      Controls how text and images will be displayed in the receiver. The argument should be one of LEFT, RIGHT or CENTER. If the receiver is a SEPARATOR label, the argument is ignored and the alignment is not changed.
      Parameters:
      alignment - the new alignment
      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)
      Description copied from class: Control
      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.
      Overrides:
      setEnabled in class Control
      Parameters:
      enabled - the new enabled state

    • setImage

      public void setImage(Image image)
      Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
      Parameters:
      image - the 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

    • setText

      public void setText(String string)
      Sets the receiver's text.

      This method sets the widget label. The label may include the mnemonic character and line delimiters.

      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 control that follows the label. 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