Package org.eclipse.jface.resource
Class DeviceResourceDescriptor
- java.lang.Object
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- org.eclipse.jface.resource.DeviceResourceDescriptor
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- Direct Known Subclasses:
ColorDescriptor,FontDescriptor,ImageDescriptor
public abstract class DeviceResourceDescriptor extends Object
Instances of this class can allocate and dispose SWT resources. Each instance describes a particular resource (such as a Color, Font, or Image) and can create and destroy that resource on demand. DeviceResourceDescriptors are managed by a ResourceRegistry.Note: It is recommended that subclasses implement
#equalsand#hashCode, so that clients, like decoration managers, can recognize when they have two equal descriptors at hand, e.g. decorating an identical object.- Since:
- 3.1
- See Also:
ResourceManager
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Constructor Summary
Constructors Constructor Description DeviceResourceDescriptor()
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description abstract ObjectcreateResource(Device device)Creates the resource described by this descriptorabstract voiddestroyResource(Object previouslyCreatedObject)Undoes everything that was done by a previous call to create(...), given the object that was returned by create(...).
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Method Detail
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createResource
public abstract Object createResource(Device device)
Creates the resource described by this descriptor- Parameters:
device- the Device on which to allocate the resource- Returns:
- the newly allocated resource (not null)
- Throws:
DeviceResourceException- if unable to allocate the resource- Since:
- 3.1
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destroyResource
public abstract void destroyResource(Object previouslyCreatedObject)
Undoes everything that was done by a previous call to create(...), given the object that was returned by create(...).- Parameters:
previouslyCreatedObject- an object that was returned by an equal descriptor in a previous call to createResource(...).- Since:
- 3.1
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