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Eclipse Platform
Release 3.5
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org.eclipse.jface.databinding.swt
Class SWTObservables


java.lang.Object
  extended by 
org.eclipse.jface.databinding.swt.SWTObservables

public class SWTObservables

extends 
Object

A factory for creating observables for SWT widgets

Since:
1.1

Constructor Summary
SWTObservables ()
           
 
Method Summary
static  Realm getRealm ( Display display)
          Returns the realm representing the UI thread for the given display.
static  ISWTObservableValue observeBackground ( Control control)
          Returns an observable value tracking the background color of the given control
static  ISWTObservableValue observeBounds ( Control control)
          Returns an observable value tracking the bounds of the given control.
static  ISWTObservableValue observeDelayedValue (int delay, ISWTObservableValue observable)
          Returns an observable which delays notification of value change events from observable until delay milliseconds have elapsed since the last change event, or until a FocusOut event is received from the underlying widget (whichever happens first).
static  ISWTObservableValue observeEditable ( Control control)
          Returns an observable observing the editable attribute of the provided control.
static  ISWTObservableValue observeEnabled ( Control control)
          Returns an observable value tracking the enabled state of the given control
static  ISWTObservableValue observeFocus ( Control control)
          Returns an observable value tracking the focus of the given control.
static  ISWTObservableValue observeFont ( Control control)
          Returns an observable value tracking the font of the given control.
static  ISWTObservableValue observeForeground ( Control control)
          Returns an observable value tracking the foreground color of the given control
static  ISWTObservableValue observeImage ( Widget widget)
          Returns an observable observing the image attribute of the provided widget.
static  IObservableList observeItems ( Control control)
          Returns an observable observing the items attribute of the provided control.
static  ISWTObservableValue observeLocation ( Control control)
          Returns an observable value tracking the location of the given control.
static  ISWTObservableValue observeMax ( Control control)
          Returns an observable observing the maximum attribute of the provided control.
static  ISWTObservableValue observeMessage ( Widget widget)
          Returns an observable observing the message attribute of the provided widget. the supported types are: org.eclipse.swt.widgets.Text org.eclipse.swt.widgets.ToolTip
static  ISWTObservableValue observeMin ( Control control)
          Returns an observable observing the minimum attribute of the provided control.
static  ISWTObservableValue observeSelection ( Control control)
          Returns an observable observing the selection attribute of the provided control.
static  ISWTObservableValue observeSingleSelectionIndex ( Control control)
          Returns an observable observing the single selection index attribute of the provided control.
static  ISWTObservableValue observeSize ( Control control)
          Returns an observable value tracking the size of the given control.
static  ISWTObservableValue observeText ( Control control)
          Returns an observable observing the text attribute of the provided control.
static  ISWTObservableValue observeText ( Control control, int event)
          Returns an observable observing the text attribute of the provided control.
static  ISWTObservableValue observeText ( Control control, int[] events)
          Returns an observable observing the text attribute of the provided control.
static  ISWTObservableValue observeText ( Widget widget)
          Returns an observable observing the text attribute of the provided widget.
static  ISWTObservableValue observeTooltipText ( Control control)
          Returns an observable value tracking the tooltip text of the given control
static  ISWTObservableValue observeTooltipText ( Widget widget)
          Returns an observable tracking the tooltip text of the given item.
static  ISWTObservableValue observeVisible ( Control control)
          Returns an observable value tracking the visible state of the given control
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SWTObservables

public SWTObservables()
Method Detail

getRealm

public static 
Realm getRealm(
Display display)
Returns the realm representing the UI thread for the given display.

Parameters:
display -
Returns:
the realm representing the UI thread for the given display

observeDelayedValue

public static 
ISWTObservableValue observeDelayedValue(int delay,
                                                      
ISWTObservableValue observable)
Returns an observable which delays notification of value change events from observable until delay milliseconds have elapsed since the last change event, or until a FocusOut event is received from the underlying widget (whichever happens first). This observable helps to boost performance in situations where an observable has computationally expensive listeners (e.g. changing filters in a viewer) or many dependencies (master fields with multiple detail fields). A common use of this observable is to delay validation of user input until the user stops typing in a UI field.

To notify about pending changes, the returned observable fires a stale event when the wrapped observable value fires a change event, and remains stale until the delay has elapsed and the value change is fired. A call to getValue() while a value change is pending will fire the value change immediately, short-circuiting the delay.

Note that this observable will not forward ValueChangingEvent events from a wrapped IVetoableValue.

Parameters:
delay - the delay in milliseconds
observable - the observable being delayed
Returns:
an observable which delays notification of value change events from observable until delay milliseconds have elapsed since the last change event.
Since:
1.2

observeEnabled

public static 
ISWTObservableValue observeEnabled(
Control control)
Returns an observable value tracking the enabled state of the given control

Parameters:
control - the control to observe
Returns:
an observable value tracking the enabled state of the given control

observeVisible

public static 
ISWTObservableValue observeVisible(
Control control)
Returns an observable value tracking the visible state of the given control

Parameters:
control - the control to observe
Returns:
an observable value tracking the visible state of the given control

observeTooltipText

public static 
ISWTObservableValue observeTooltipText(
Widget widget)
Returns an observable tracking the tooltip text of the given item. The supported types are:
  • org.eclipse.swt.widgets.Control
  • org.eclipse.swt.custom.CTabItem
  • org.eclipse.swt.widgets.TabItem
  • org.eclipse.swt.widgets.TableColumn
  • org.eclipse.swt.widgets.ToolItem
  • org.eclipse.swt.widgets.TrayItem
  • org.eclipse.swt.widgets.TreeColumn

Parameters:
widget -
Returns:
an observable value tracking the tooltip text of the given item
Since:
1.3

observeTooltipText

public static 
ISWTObservableValue observeTooltipText(
Control control)
Returns an observable value tracking the tooltip text of the given control

Parameters:
control - the control to observe
Returns:
an observable value tracking the tooltip text of the given control

observeSelection

public static 
ISWTObservableValue observeSelection(
Control control)
Returns an observable observing the selection attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Spinner
  • org.eclipse.swt.widgets.Button
  • org.eclipse.swt.widgets.Combo
  • org.eclipse.swt.custom.CCombo
  • org.eclipse.swt.widgets.List
  • org.eclipse.swt.widgets.Scale

Parameters:
control -
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported

observeMin

public static 
ISWTObservableValue observeMin(
Control control)
Returns an observable observing the minimum attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Spinner
  • org.eclipse.swt.widgets.Scale

Parameters:
control -
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported

observeMax

public static 
ISWTObservableValue observeMax(
Control control)
Returns an observable observing the maximum attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Spinner
  • org.eclipse.swt.widgets.Scale

Parameters:
control -
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported

observeText

public static 
ISWTObservableValue observeText(
Control control,
                                              int[] events)
Returns an observable observing the text attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Text
  • org.eclipse.swt.custom.StyledText (as of 1.3)

Parameters:
control -
events - array of SWT event types to register for change events. May include SWT.None, SWT.Modify, SWT.FocusOut or SWT.DefaultSelection.
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported
Since:
1.3

observeText

public static 
ISWTObservableValue observeText(
Control control,
                                              int event)
Returns an observable observing the text attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Text
  • org.eclipse.swt.custom.StyledText (as of 1.3)

Parameters:
control -
event - event type to register for change events
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported

observeText

public static 
ISWTObservableValue observeText(
Widget widget)
Returns an observable observing the text attribute of the provided widget. The supported types are:
  • org.eclipse.swt.widgets.Button (as of 1.3)
  • org.eclipse.swt.custom.CCombo
  • org.eclipse.swt.custom.CLabel
  • org.eclipse.swt.widgets.Combo
  • org.eclipse.swt.widgets.Item
  • org.eclipse.swt.widgets.Label
  • org.eclipse.swt.widgets.Link (as of 1.2)
  • org.eclipse.swt.widgets.Shell
  • org.eclipse.swt.widgets.StyledText (as of 1.3)
  • org.eclipse.swt.widgets.Text (as of 1.3)

Parameters:
widget -
Returns:
observable value
Throws:
IllegalArgumentException - if the type of widget is unsupported
Since:
1.3

observeText

public static 
ISWTObservableValue observeText(
Control control)
Returns an observable observing the text attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Button (as of 1.3)
  • org.eclipse.swt.custom.CCombo
  • org.eclipse.swt.custom.CLabel
  • org.eclipse.swt.widgets.Combo
  • org.eclipse.swt.widgets.Label
  • org.eclipse.swt.widgets.Link (as of 1.2)
  • org.eclipse.swt.widgets.Shell
  • org.eclipse.swt.custom.StyledText (as of 1.3)
  • org.eclipse.swt.widgets.Text (as of 1.3)

Parameters:
control -
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported

observeMessage

public static 
ISWTObservableValue observeMessage(
Widget widget)
Returns an observable observing the message attribute of the provided widget. the supported types are:
  • org.eclipse.swt.widgets.Text
  • org.eclipse.swt.widgets.ToolTip

      • Parameters:
      widget -
      Returns:
      an observable observing the message attribute of the provided widget.
      Since:
      1.3

observeImage

public static 
ISWTObservableValue observeImage(
Widget widget)
Returns an observable observing the image attribute of the provided widget. The supported types are:
  • org.eclipse.swt.widgets.Button
  • org.eclipse.swt.custom.CLabel
  • org.eclipse.swt.widgets.Item
  • org.eclipse.swt.widgets.Label

Parameters:
widget -
Returns:
observable value
Throws:
IllegalArgumentException - if widget type is unsupported
Since:
1.3

observeItems

public static 
IObservableList observeItems(
Control control)
Returns an observable observing the items attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Combo
  • org.eclipse.swt.custom.CCombo
  • org.eclipse.swt.widgets.List

Parameters:
control -
Returns:
observable list
Throws:
IllegalArgumentException - if control type is unsupported

observeSingleSelectionIndex

public static 
ISWTObservableValue observeSingleSelectionIndex(
Control control)
Returns an observable observing the single selection index attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Table
  • org.eclipse.swt.widgets.Combo
  • org.eclipse.swt.custom.CCombo
  • org.eclipse.swt.widgets.List

Parameters:
control -
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported

observeForeground

public static 
ISWTObservableValue observeForeground(
Control control)
Returns an observable value tracking the foreground color of the given control

Parameters:
control - the control to observe
Returns:
an observable value tracking the foreground color of the given control

observeBackground

public static 
ISWTObservableValue observeBackground(
Control control)
Returns an observable value tracking the background color of the given control

Parameters:
control - the control to observe
Returns:
an observable value tracking the background color of the given control

observeFont

public static 
ISWTObservableValue observeFont(
Control control)
Returns an observable value tracking the font of the given control.

Parameters:
control - the control to observe
Returns:
an observable value tracking the font of the given control

observeSize

public static 
ISWTObservableValue observeSize(
Control control)
Returns an observable value tracking the size of the given control.

Parameters:
control - the control to observe
Returns:
an observable value tracking the size of the given control
Since:
1.3

observeLocation

public static 
ISWTObservableValue observeLocation(
Control control)
Returns an observable value tracking the location of the given control.

Parameters:
control - the control to observe
Returns:
an observable value tracking the location of the given control
Since:
1.3

observeFocus

public static 
ISWTObservableValue observeFocus(
Control control)
Returns an observable value tracking the focus of the given control.

Parameters:
control - the control to observe
Returns:
an observable value tracking the focus of the given control
Since:
1.3

observeBounds

public static 
ISWTObservableValue observeBounds(
Control control)
Returns an observable value tracking the bounds of the given control.

Parameters:
control - the control to observe
Returns:
an observable value tracking the bounds of the given control
Since:
1.3

observeEditable

public static 
ISWTObservableValue observeEditable(
Control control)
Returns an observable observing the editable attribute of the provided control. The supported types are:
  • org.eclipse.swt.widgets.Text

Parameters:
control -
Returns:
observable value
Throws:
IllegalArgumentException - if control type is unsupported
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