CompositeImageDescriptor.CachedImageDataProvider (Eclipse Platform API Specification)

java.lang.Object
- org.eclipse.jface.resource.CompositeImageDescriptor.CachedImageDataProvider

All Implemented Interfaces:

ImageDataProvider

Enclosing class:

CompositeImageDescriptor
```
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)

Restriction:

This class is not intended to be subclassed by clients.

Constructor Summary

Constructors
Modifier Constructor Description

protected CachedImageDataProvider()

Method Summary

All Methods Instance Methods Concrete Methods
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 Detail
  - CachedImageDataProvider
```
protected CachedImageDataProvider()
```
- Method Detail
  - 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