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java.lang.Object org.eclipse.swt.widgets.Widget org.eclipse.swt.widgets.Control org.eclipse.swt.widgets.Scrollable org.eclipse.swt.widgets.Composite org.eclipse.swt.widgets.Canvas
public class Canvas
Instances of this class provide a surface for drawing arbitrary graphics.
This class may be subclassed by custom control implementors who are building controls that are not constructed from aggregates of other controls. That is, they are either painted using SWT graphics calls or are handled by native methods.
Composite
Constructor Summary | |
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Canvas(Composite parent,
int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance. |
Method Summary | ||
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void |
addPaintListener(PaintListener listener)
Adds the listener to the collection of listeners who will be notified when the receiver needs to be painted, by sending it one of the messages defined in the PaintListener
interface. |
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getAdapter(java.lang.Class<T> adapter)
Implementation of the Adaptable interface. |
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void |
removePaintListener(PaintListener listener)
Removes the listener from the collection of listeners who will be notified when the receiver needs to be painted. |
Methods inherited from class org.eclipse.swt.widgets.Composite |
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changed, computeSize, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setLayoutDeferred, setTabList |
Methods inherited from class org.eclipse.swt.widgets.Scrollable |
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computeTrim, getClientArea, getHorizontalBar, getVerticalBar |
Methods inherited from class org.eclipse.swt.widgets.Widget |
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addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, reskin, setData, setData, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Canvas(Composite parent, int style)
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.
parent
- a composite control which will be the parent of the new
instance (cannot be null)style
- the style of control to construct
java.lang.IllegalArgumentException
- SWTException
- SWT
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
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public <T> T getAdapter(java.lang.Class<T> adapter)
Adaptable
interface.
IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code.
getAdapter
in interface Adaptable
getAdapter
in class Composite
adapter
- the lookup class
null
if
there is no adapter associated with the given class.public void addPaintListener(PaintListener listener)
PaintListener
interface.
listener
- the listener which should be notified
java.lang.IllegalArgumentException
- SWTException
- PaintListener
,
removePaintListener(org.eclipse.swt.events.PaintListener)
public void removePaintListener(PaintListener listener)
listener
- the listener which should no longer be notified
java.lang.IllegalArgumentException
- SWTException
- PaintListener
,
addPaintListener(org.eclipse.swt.events.PaintListener)
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Copyright (c) EclipseSource and others 2002, 2013. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0