org.eclipse.wb.swt

Class SWTResourceManager

java.lang.Object

org.eclipse.wb.swt.SWTResourceManager

Direct Known Subclasses:

ResourceManager

public class SWTResourceManager
extends Object

Utility class for managing OS resources associated with SWT controls such as colors, fonts, images, etc.

!!! IMPORTANT !!! Application code must explicitly invoke the dispose() method to release the operating system resources managed by cached objects when those objects and OS resources are no longer needed (e.g. on application shutdown)

This class may be freely distributed as part of any application or plugin.

Author:

scheglov_ke, Dan Rubel

Field Summary

Fields

Modifier and Type	Field and Description
static int	BOTTOM_LEFT Style constant for placing decorator image in bottom left corner of base image.
static int	BOTTOM_RIGHT Style constant for placing decorator image in bottom right corner of base image.
protected static int	LAST_CORNER_KEY Internal value.
static int	TOP_LEFT Style constant for placing decorator image in top left corner of base image.
static int	TOP_RIGHT Style constant for placing decorator image in top right corner of base image.

Constructor Summary

Constructors

Constructor and Description
SWTResourceManager()

Method Summary

Methods

Modifier and Type	Method and Description
static Image	decorateImage(Image baseImage, Image decorator) Returns an Image composed of a base image decorated by another image.
static Image	decorateImage(Image baseImage, Image decorator, int corner) Returns an Image composed of a base image decorated by another image.
static void	dispose() Dispose of cached objects and their underlying OS resources.
static void	disposeColors() Dispose of all the cached Color's.
static void	disposeCursors() Dispose all of the cached cursors.
static void	disposeFonts() Dispose all of the cached Font's.
static void	disposeImages() Dispose all of the cached Image's.
static Font	getBoldFont(Font baseFont) Returns a bold version of the given Font.
static Color	getColor(int systemColorID) Returns the system Color matching the specific ID.
static Color	getColor(int r, int g, int b) Returns a Color given its red, green and blue component values.
static Color	getColor(RGB rgb) Returns a Color given its RGB value.
static Cursor	getCursor(int id) Returns the system cursor matching the specific ID.
static Font	getFont(String name, int height, int style) Returns a Font based on its name, height and style.
static Font	getFont(String name, int size, int style, boolean strikeout, boolean underline) Returns a Font based on its name, height and style.
static Image	getImage(Class<?> clazz, String path) Returns an Image stored in the file at the specified path relative to the specified class.
protected static Image	getImage(InputStream stream) Returns an Image encoded by the specified InputStream.
static Image	getImage(String path) Returns an Image stored in the file at the specified path.

Methods inherited from class java.lang.Object

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

Field Detail

TOP_LEFT

public static final int TOP_LEFT

Style constant for placing decorator image in top left corner of base image.

See Also:

Constant Field Values

TOP_RIGHT

public static final int TOP_RIGHT

Style constant for placing decorator image in top right corner of base image.

See Also:

Constant Field Values

BOTTOM_LEFT

public static final int BOTTOM_LEFT

Style constant for placing decorator image in bottom left corner of base image.

See Also:

Constant Field Values

BOTTOM_RIGHT

public static final int BOTTOM_RIGHT

Style constant for placing decorator image in bottom right corner of base image.

See Also:

Constant Field Values

LAST_CORNER_KEY

protected static final int LAST_CORNER_KEY

Internal value.

See Also:

Constant Field Values

Constructor Detail

SWTResourceManager

public SWTResourceManager()

Method Detail

getColor

public static Color getColor(int systemColorID)

Returns the system Color matching the specific ID.

Parameters:

systemColorID - the ID value for the color

Returns:

the system Color matching the specific ID

getColor

public static Color getColor(int r,
             int g,
             int b)

Returns a Color given its red, green and blue component values.

Parameters:

r - the red component of the color

g - the green component of the color

b - the blue component of the color

Returns:

the Color matching the given red, green and blue component values

getColor

public static Color getColor(RGB rgb)

Returns a Color given its RGB value.

Parameters:

rgb - the RGB value of the color

Returns:

the Color matching the RGB value

disposeColors

public static void disposeColors()

Dispose of all the cached Color's.

getImage

protected static Image getImage(InputStream stream)
                         throws IOException

Returns an Image encoded by the specified InputStream.

Parameters:

stream - the InputStream encoding the image data

Returns:

the Image encoded by the specified input stream

Throws:

IOException

getImage

public static Image getImage(String path)

Returns an Image stored in the file at the specified path.

Parameters:

path - the path to the image file

Returns:

the Image stored in the file at the specified path

getImage

public static Image getImage(Class<?> clazz,
             String path)

Returns an Image stored in the file at the specified path relative to the specified class.

Parameters:

clazz - the Class relative to which to find the image

path - the path to the image file, if starts with '/'

Returns:

the Image stored in the file at the specified path

decorateImage

public static Image decorateImage(Image baseImage,
                  Image decorator)

Returns an Image composed of a base image decorated by another image.

Parameters:

baseImage - the base Image that should be decorated

decorator - the Image to decorate the base image

Returns:

Image The resulting decorated image

decorateImage

public static Image decorateImage(Image baseImage,
                  Image decorator,
                  int corner)

Returns an Image composed of a base image decorated by another image.

Parameters:

baseImage - the base Image that should be decorated

decorator - the Image to decorate the base image

corner - the corner to place decorator image

Returns:

the resulting decorated Image

disposeImages

public static void disposeImages()

Dispose all of the cached Image's.

getFont

public static Font getFont(String name,
           int height,
           int style)

Returns a Font based on its name, height and style.

Parameters:

name - the name of the font

height - the height of the font

style - the style of the font

Returns:

Font The font matching the name, height and style

getFont

public static Font getFont(String name,
           int size,
           int style,
           boolean strikeout,
           boolean underline)

Returns a Font based on its name, height and style. Windows-specific strikeout and underline flags are also supported.

Parameters:

name - the name of the font

size - the size of the font

style - the style of the font

strikeout - the strikeout flag (warning: Windows only)

underline - the underline flag (warning: Windows only)

Returns:

Font The font matching the name, height, style, strikeout and underline

getBoldFont

public static Font getBoldFont(Font baseFont)

Returns a bold version of the given Font.

Parameters:

baseFont - the Font for which a bold version is desired

Returns:

the bold version of the given Font

disposeFonts

public static void disposeFonts()

Dispose all of the cached Font's.

getCursor

public static Cursor getCursor(int id)

Returns the system cursor matching the specific ID.

Parameters:

id - int The ID value for the cursor

Returns:

Cursor The system cursor matching the specific ID

disposeCursors

public static void disposeCursors()

Dispose all of the cached cursors.

dispose

public static void dispose()

Dispose of cached objects and their underlying OS resources. This should only be called when the cached objects are no longer needed (e.g. on application shutdown).