Package org.eclipse.jface.resource

Class CompositeImageDescriptor.CachedImageDataProvider

java.lang.Object

org.eclipse.jface.resource.CompositeImageDescriptor.CachedImageDataProvider

All Implemented Interfaces:

ImageDataProvider

Enclosing class:

CompositeImageDescriptor

@NoExtend
protected abstract class CompositeImageDescriptor.CachedImageDataProvider
extends Object
implements ImageDataProvider

An ImageDataProvider that caches the most recently returned ImageData object. I.e. consecutive calls to ImageDataProvider.getImageData(int) with the same zoom level are cheap.

Since:

3.13

See Also:

• CompositeImageDescriptor.createCachedImageDataProvider(Image)
• CompositeImageDescriptor.createCachedImageDataProvider(ImageDescriptor)

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CachedImageDataProvider()

Method Summary

Modifier and Type	Method	Description
int	computeInPoints(ToIntFunction<ImageData> function)	Returns a computed value in SWT logical points.
int	getHeight()	Returns the ImageData.height in points.
int	getWidth()	Returns the ImageData.width in points.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.eclipse.swt.graphics.ImageDataProvider

getImageData

Constructor Details

CachedImageDataProvider

protected CachedImageDataProvider()

Method Details

getWidth

public int getWidth()

Returns the ImageData.width in points. This method must only be called within the dynamic scope of a call to CompositeImageDescriptor.drawCompositeImage(int, int).

Returns:

the width in points

getHeight

public int getHeight()

Returns the ImageData.height in points. This method must only be called within the dynamic scope of a call to CompositeImageDescriptor.drawCompositeImage(int, int).

Returns:

the height in points

computeInPoints

public int computeInPoints(ToIntFunction<ImageData> function)

Returns a computed value in SWT logical points. The given function computes a value in pixels, based on information from the given ImageData, which is also in pixels. This method must only be called within the dynamic scope of a call to CompositeImageDescriptor.drawCompositeImage(int, int).

Parameters:

function - a function that takes an ImageData and computes a value in pixels

Returns:

the computed value in points