Package org.eclipse.jface.viewers

Class OwnerDrawLabelProvider

java.lang.Object

org.eclipse.core.commands.common.EventManager

org.eclipse.jface.viewers.BaseLabelProvider

org.eclipse.jface.viewers.CellLabelProvider

org.eclipse.jface.viewers.OwnerDrawLabelProvider

All Implemented Interfaces:

IBaseLabelProvider, IToolTipProvider

Direct Known Subclasses:

StyledCellLabelProvider

public abstract class OwnerDrawLabelProvider
extends CellLabelProvider

OwnerDrawLabelProvider is an abstract implementation of a label provider that handles custom draw.

This class is intended to be subclassed by implementors.

Since:

3.3

Constructor Summary

Constructors

Constructor	Description
OwnerDrawLabelProvider()	Create a new instance of the receiver based on a column viewer.

Method Summary

Modifier and Type	Method	Description
void	dispose(ColumnViewer viewer, ViewerColumn column)	Dispose of this label provider which was used with the given column viewer and column.
protected void	erase(Event event, Object element)	Handle the erase event.
protected void	initialize(ColumnViewer viewer, ViewerColumn column)	This implementation of CellLabelProvider.initialize(ColumnViewer, ViewerColumn) delegates to initialize(ColumnViewer, ViewerColumn, boolean) with a value of true for enableOwnerDraw.
protected final void	initialize(ColumnViewer viewer, ViewerColumn column, boolean enableOwnerDraw)	May be called from subclasses that override initialize(ColumnViewer, ViewerColumn) but want to customize whether owner draw will be enabled.
protected abstract void	measure(Event event, Object element)	Handle the measure event.
protected abstract void	paint(Event event, Object element)	Handle the paint event.
protected void	setOwnerDrawEnabled(ColumnViewer viewer, ViewerColumn column, boolean enabled)	Enables or disables owner draw for the given viewer and column.
static void	setUpOwnerDraw(ColumnViewer viewer)	Deprecated. Since 3.4, the default implementation of CellLabelProvider.initialize(ColumnViewer, ViewerColumn) in this class will set up the necessary owner draw callbacks automatically.
void	update(ViewerCell cell)	Update the label for cell.

Methods inherited from class org.eclipse.jface.viewers.CellLabelProvider

getToolTipBackgroundColor, getToolTipDisplayDelayTime, getToolTipFont, getToolTipForegroundColor, getToolTipImage, getToolTipShift, getToolTipStyle, getToolTipText, getToolTipTimeDisplayed, useNativeToolTip

Methods inherited from class org.eclipse.jface.viewers.BaseLabelProvider

addListener, dispose, fireLabelProviderChanged, isLabelProperty, removeListener

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

Constructor Details

OwnerDrawLabelProvider

public OwnerDrawLabelProvider()

Create a new instance of the receiver based on a column viewer.

Method Details

setUpOwnerDraw

@Deprecated
public static void setUpOwnerDraw(ColumnViewer viewer)

Deprecated.

Since 3.4, the default implementation of CellLabelProvider.initialize(ColumnViewer, ViewerColumn) in this class will set up the necessary owner draw callbacks automatically. Calls to this method can be removed.

Set up the owner draw callbacks for the viewer.

Parameters:

viewer - the viewer the owner draw is set up

dispose

public void dispose(ColumnViewer viewer,
 ViewerColumn column)

Description copied from class: CellLabelProvider

Dispose of this label provider which was used with the given column viewer and column. Subclasses may extend but should call the super implementation (which calls BaseLabelProvider.dispose()).

Overrides:

dispose in class CellLabelProvider

Parameters:

viewer - the viewer

column - the column, or null if a column is not available.

initialize

protected void initialize(ColumnViewer viewer,
 ViewerColumn column)

This implementation of CellLabelProvider.initialize(ColumnViewer, ViewerColumn) delegates to initialize(ColumnViewer, ViewerColumn, boolean) with a value of true for enableOwnerDraw. Subclasses may override this method but should either call the super implementation or, alternatively, initialize(ColumnViewer, ViewerColumn, boolean).

Overrides:

initialize in class CellLabelProvider

Parameters:

viewer - the viewer

column - the column, or null if a column is not available.

initialize

protected final void initialize(ColumnViewer viewer,
 ViewerColumn column,
 boolean enableOwnerDraw)

May be called from subclasses that override initialize(ColumnViewer, ViewerColumn) but want to customize whether owner draw will be enabled. This method calls super.initialize(ColumnViewer, ViewerColumn), and then enables or disables owner draw by calling setOwnerDrawEnabled(ColumnViewer, ViewerColumn, boolean).

Parameters:

viewer - the viewer

column - the column, or null if a column is not available.

enableOwnerDraw - true if owner draw should be enabled for the given viewer and column, false otherwise.

Since:

3.4

update

public void update(ViewerCell cell)

Description copied from class: CellLabelProvider

Update the label for cell.

Specified by:

update in class CellLabelProvider

Parameters:

cell - ViewerCell

erase

protected void erase(Event event,
 Object element)

Handle the erase event. The default implementation colors the background of selected areas with SWT.COLOR_LIST_SELECTION and foregrounds with SWT.COLOR_LIST_SELECTION_TEXT. Note that this implementation causes non-native behavior on some platforms. Subclasses should override this method and not call the super implementation.

Parameters:

event - the erase event

element - the model object

See Also:

• SWT.EraseItem
• SWT.COLOR_LIST_SELECTION
• SWT.COLOR_LIST_SELECTION_TEXT

measure

protected abstract void measure(Event event,
 Object element)

Handle the measure event.

Parameters:

event - the measure event

element - the model element

See Also:

• SWT.MeasureItem

paint

protected abstract void paint(Event event,
 Object element)

Handle the paint event.

Parameters:

event - the paint event

element - the model element

See Also:

• SWT.PaintItem

setOwnerDrawEnabled

protected void setOwnerDrawEnabled(ColumnViewer viewer,
 ViewerColumn column,
 boolean enabled)

Enables or disables owner draw for the given viewer and column. This method will attach or remove a listener to the underlying control as necessary. This method is called from initialize(ColumnViewer, ViewerColumn) and dispose(ColumnViewer, ViewerColumn) but may be called from subclasses to enable or disable owner draw dynamically.

Parameters:

viewer - the viewer

column - the column, or null if a column is not available

enabled - true if owner draw should be enabled, false otherwise

Since:

3.4