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Eclipse Platform
Release 3.5

org.eclipse.ui.part
Class EditorPart

java.lang.Object
  extended by 

org.eclipse.core.commands.common.EventManager
      extended by 

org.eclipse.ui.part.WorkbenchPart
          extended by 
org.eclipse.ui.part.EditorPart
All Implemented Interfaces:
IAdaptable, IExecutableExtension, IEditorPart, ISaveablePart, IWorkbenchPart, IWorkbenchPart2, IWorkbenchPart3, IWorkbenchPartOrientation
Direct Known Subclasses:
AbstractMultiEditor, AbstractTextEditor, CommonSourceNotFoundEditor, FormPage, MultiPageEditor, MultiPageEditorPart

public abstract class EditorPart
extends WorkbenchPart
implements IEditorPart

Abstract base implementation of all workbench editors.

This class should be subclassed by clients wishing to define new editors. The name of the subclass should be given as the "class" attribute in a editor extension contributed to the workbench's view extension point (named "org.eclipse.ui.editors"). For example, the plug-in's XML markup might contain:

 <extension point="org.eclipse.ui.editors">
      <editor id="com.example.myplugin.ed"
         name="My Editor"
         icon="./images/cedit.gif"
                   extensions="foo" 
                   class="com.example.myplugin.MyFooEditor" 
                   contributorClass="com.example.myplugin.MyFooEditorContributor" 
      />
 </extension>
 
where com.example.myplugin.MyEditor is the name of the EditorPart subclass.

Subclasses must implement the following methods:

  • IEditorPart.init - to initialize editor when assigned its site
  • IWorkbenchPart.createPartControl - to create the editor's controls
  • IWorkbenchPart.setFocus - to accept focus
  • IEditorPart.isDirty - to decide whether a significant change has occurred
  • IEditorPart.doSave - to save contents of editor
  • IEditorPart.doSaveAs - to save contents of editor
  • IEditorPart.isSaveAsAllowed - to control Save As

Subclasses may extend or reimplement the following methods as required:

  • IExecutableExtension.setInitializationData - extend to provide additional initialization when editor extension is instantiated
  • IWorkbenchPart.dispose - extend to provide additional cleanup
  • IAdaptable.getAdapter - reimplement to make the editor adaptable


Field Summary
 
Fields inherited from interface org.eclipse.ui. IEditorPart
PROP_DIRTY, PROP_INPUT
 
Fields inherited from interface org.eclipse.ui. IWorkbenchPart
PROP_TITLE
 
Constructor Summary
protected EditorPart ()
          Creates a new workbench editor.
 
Method Summary
protected  void checkSite ( IWorkbenchPartSite site)
          Checks that the given site is valid for this type of part.
abstract  void doSave ( IProgressMonitor monitor)
          Saves the contents of this part.
abstract  void doSaveAs ()
          Saves the contents of this part to another object.
  IEditorInput getEditorInput ()
          Returns the input for this editor.
  IEditorSite getEditorSite ()
          Returns the site for this editor.
  String getTitleToolTip ()
          Returns the title tool tip text of this workbench part.
abstract  void init ( IEditorSite site, IEditorInput input)
          Initializes this editor with the given editor site and input.
abstract  boolean isDirty ()
          Returns whether the contents of this part have changed since the last save operation.
abstract  boolean isSaveAsAllowed ()
          Returns whether the "Save As" operation is supported by this part.
 boolean isSaveOnCloseNeeded ()
          Returns whether the contents of this part should be saved when the part is closed.
protected  void setContentDescription ( String description)
          Sets the content description for this part.
 void setInitializationData ( IConfigurationElement cfig, String propertyName, Object data)
          This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information.
protected  void setInput ( IEditorInput input)
          Sets the input to this editor.
protected  void setInputWithNotify ( IEditorInput input)
          Sets the input to this editor and fires a PROP_INPUT property change if the input has changed.
protected  void setPartName ( String partName)
          Sets the name of this part.
 
Methods inherited from class org.eclipse.ui.part. WorkbenchPart
addPartPropertyListener, addPropertyListener, createPartControl, dispose, firePartPropertyChanged, firePropertyChange, getAdapter, getConfigurationElement, getContentDescription, getDefaultImage, getOrientation, getPartName, getPartProperties, getPartProperty, getSite, getTitle, getTitleImage, removePartPropertyListener, removePropertyListener, setFocus, setPartProperty, setSite, setTitle, setTitleImage, setTitleToolTip, showBusy
 
Methods inherited from class org.eclipse.core.commands.common. EventManager
addListenerObject, clearListeners, getListeners, isListenerAttached, removeListenerObject
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.eclipse.ui. IWorkbenchPart
addPropertyListener, createPartControl, dispose, getSite, getTitle, getTitleImage, removePropertyListener, setFocus
 
Methods inherited from interface org.eclipse.core.runtime. IAdaptable
getAdapter
 

Constructor Detail

EditorPart

protected EditorPart()
Creates a new workbench editor.

Method Detail

doSave

public abstract void doSave(
IProgressMonitor monitor)
Description copied from interface: ISaveablePart
Saves the contents of this part.

If the save is successful, the part should fire a property changed event reflecting the new dirty state (PROP_DIRTY property).

If the save is cancelled through user action, or for any other reason, the part should invoke setCancelled on the IProgressMonitor to inform the caller.

This method is long-running; progress and cancellation are provided by the given progress monitor.

Specified by:
doSave in interface ISaveablePart
Parameters:
monitor - the progress monitor

doSaveAs

public abstract void doSaveAs()
Description copied from interface: ISaveablePart
Saves the contents of this part to another object.

Implementors are expected to open a "Save As" dialog where the user will be able to select a new name for the contents. After the selection is made, the contents should be saved to that new name. During this operation a IProgressMonitor should be used to indicate progress.

If the save is successful, the part fires a property changed event reflecting the new dirty state (PROP_DIRTY property).

Specified by:
doSaveAs in interface ISaveablePart

getEditorInput

public 
IEditorInput getEditorInput()
Description copied from interface: IEditorPart
Returns the input for this editor. If this value changes the part must fire a property listener event with PROP_INPUT.

Specified by:
getEditorInput in interface IEditorPart
Returns:
the editor input

getEditorSite

public 
IEditorSite getEditorSite()
Description copied from interface: IEditorPart
Returns the site for this editor. This method is equivalent to (IEditorSite) getSite().

The site can be null while the editor is being initialized. After the initialization is complete, this value must be non-null for the remainder of the editor's life cycle.

Specified by:
getEditorSite in interface IEditorPart
Returns:
the editor site; this value may be null if the editor has not yet been initialized

getTitleToolTip

public 
String getTitleToolTip()
Description copied from interface: IWorkbenchPart
Returns the title tool tip text of this workbench part. An empty string result indicates no tool tip. If this value changes the part must fire a property listener event with PROP_TITLE.

The tool tip text is used to populate the title bar of this part's visual container.

Specified by:
getTitleToolTip in interface IWorkbenchPart
Overrides:
getTitleToolTip in class WorkbenchPart
Returns:
the workbench part title tool tip (not null)

init

public abstract void init(
IEditorSite site,
                          
IEditorInput input)
                   throws 
PartInitException
Description copied from interface: IEditorPart
Initializes this editor with the given editor site and input.

This method is automatically called shortly after the part is instantiated. It marks the start of the part's lifecycle. The IWorkbenchPart.dispose method will be called automically at the end of the lifecycle. Clients must not call this method.

Implementors of this method must examine the editor input object type to determine if it is understood. If not, the implementor must throw a PartInitException

Specified by:
init in interface IEditorPart
Parameters:
site - the editor site
input - the editor input
Throws:
PartInitException - if this editor was not initialized successfully

isDirty

public abstract boolean isDirty()
Description copied from interface: ISaveablePart
Returns whether the contents of this part have changed since the last save operation. If this value changes the part must fire a property listener event with PROP_DIRTY.

Note: this method is called often on a part open or part activation switch, for example by actions to determine their enabled status.

Specified by:
isDirty in interface ISaveablePart
Returns:
true if the contents have been modified and need saving, and false if they have not changed since the last save

isSaveAsAllowed

public abstract boolean isSaveAsAllowed()
Description copied from interface: ISaveablePart
Returns whether the "Save As" operation is supported by this part.

Specified by:
isSaveAsAllowed in interface ISaveablePart
Returns:
true if "Save As" is supported, and false if not supported

isSaveOnCloseNeeded

public boolean isSaveOnCloseNeeded()
Description copied from interface: ISaveablePart
Returns whether the contents of this part should be saved when the part is closed.

Specified by:
isSaveOnCloseNeeded in interface ISaveablePart
Returns:
true if the contents of the part should be saved on close, and false if the contents are expendable

setInput

protected void setInput(
IEditorInput input)
Sets the input to this editor. This method simply updates the internal member variable.

Unlike most of the other set methods on this class, this method does not fire a property change. Clients that call this method from a subclass must ensure that they fire an IWorkbenchPartConstants.PROP_INPUT property change after calling this method but before leaving whatever public method they are in. Clients that expose this method as public API must fire the property change within their implementation of setInput.

Note that firing a property change may cause listeners to immediately reach back and call methods on this editor. Care should be taken not to fire the property change until the editor has fully updated its internal state to reflect the new input.

Parameters:
input - the editor input
See Also:
setInputWithNotify(IEditorInput)

setInputWithNotify

protected void setInputWithNotify(
IEditorInput input)
Sets the input to this editor and fires a PROP_INPUT property change if the input has changed. This is the convenience method implementation.

Note that firing a property change may cause other objects to reach back and invoke methods on the editor. Care should be taken not to call this method until the editor has fully updated its internal state to reflect the new input.

Parameters:
input - the editor input
Since:
3.2

setContentDescription

protected void setContentDescription(
String description)
Description copied from class: WorkbenchPart
Sets the content description for this part. The content description is typically a short string describing the current contents of the part. Setting this to the empty string will cause a default content description to be used. Clients should call this method instead of overriding getContentDescription(). For views, the content description is shown (by default) in a line near the top of the view. For editors, the content description is shown beside the part name when showing a list of editors. If the editor is open on a file, this typically contains the path to the input file, without the filename or trailing slash.

This may overwrite a value that was previously set in setTitle

Overrides:
setContentDescription in class WorkbenchPart
Parameters:
description - the content description

setPartName

protected void setPartName(
String partName)
Description copied from class: WorkbenchPart
Sets the name of this part. The name will be shown in the tab area for the part. Clients should call this method instead of overriding getPartName. Setting this to the empty string will cause a default part name to be used.

setPartName and setContentDescription are intended to replace setTitle. This may change a value that was previously set using setTitle.

Overrides:
setPartName in class WorkbenchPart
Parameters:
partName - the part name, as it should be displayed in tabs.

setInitializationData

public void setInitializationData(
IConfigurationElement cfig,
                                  
String propertyName,
                                  
Object data)
Description copied from class: WorkbenchPart
This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information. Most executable extensions only make use of the first two call arguments.

Regular executable extensions specify their Java implementation class name as an attribute of the configuration element for the extension. For example

     <action run="com.example.BaseAction"/>
 
In the above example, this method would be called with a reference to the <action> element (first argument), and "run" as the name of the attribute that defined this executable extension (second argument).

The last parameter is for the specific use of extension adapters and is typically not used by regular executable extensions.

There are two supported ways of associating additional adapter-specific data with the configuration in a way that is transparent to the extension point implementor:

(1) by specifying adapter data as part of the implementation class attribute value. The Java class name can be followed by a ":" separator, followed by any adapter data in string form. For example, if the extension point specifies an attribute "run" to contain the name of the extension implementation, an adapter can be configured as

     <action run="com.example.ExternalAdapter:./cmds/util.exe -opt 3"/>
 

(2) by converting the attribute used to specify the executable extension to a child element of the original configuration element, and specifying the adapter data in the form of xml markup. Using this form, the example above would become

     <action>
         <run class="com.xyz.ExternalAdapter">
             <parameter name="exec" value="./cmds/util.exe"/>
             <parameter name="opt"  value="3"/>
         </run>
     </action>
 

Form (2) will typically only be used for extension points that anticipate the majority of extensions configured into it will in fact be in the form of adapters.

In either case, the specified adapter class is instantiated using its 0-argument public constructor. The adapter data is passed as the last argument of this method. The data argument is defined as Object. It can have the following values:

  • null, if no adapter data was supplied
  • in case (1), the initialization data string is passed as a String
  • in case (2), the initialization data is passed as a Hashtable containing the actual parameter names and values (both Strings)

The WorkbenchPart implementation of this IExecutableExtension records the configuration element in and internal state variable (accessible via getConfigElement). It also loads the title image, if one is specified in the configuration element. Subclasses may extend. Should not be called by clients. It is called by the core plugin when creating this executable extension.

Specified by:
setInitializationData in interface IExecutableExtension
Overrides:
setInitializationData in class WorkbenchPart
Parameters:
cfig - the configuration element used to trigger this execution. It can be queried by the executable extension for specific configuration properties
propertyName - the name of an attribute of the configuration element used on the createExecutableExtension(String) call. This argument can be used in the cases where a single configuration element is used to define multiple executable extensions.
data - adapter data in the form of a String, a Hashtable, or null.
See Also:
IConfigurationElement.createExecutableExtension(String)

checkSite

protected final void checkSite(
IWorkbenchPartSite site)
Checks that the given site is valid for this type of part. The site for an editor must be an IEditorSite.

Overrides:
checkSite in class WorkbenchPart
Parameters:
site - the site to check
Since:
3.1

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire