Class ImageCursor

java.lang.Object

javafx.scene.Cursor

javafx.scene.ImageCursor

public class ImageCursor
extends Cursor

A custom image representation of the mouse cursor. On platforms that don't support custom cursors, Cursor.DEFAULT will be used in place of the specified ImageCursor.

Example:

import javafx.scene.*;
import javafx.scene.image.*;

Image image = new Image("mycursor.png");

Scene scene = new Scene(400, 300);
scene.setCursor(new ImageCursor(image,
                                image.getWidth() / 2,
                                image.getHeight() /2));

Since:: JavaFX 2.0

Property Summary

Properties
Type	Property	Description
`ReadOnlyDoubleProperty`	`hotspotX`	The X coordinate of the cursor's hot spot.
`ReadOnlyDoubleProperty`	`hotspotY`	The Y coordinate of the cursor's hot spot.
`ReadOnlyObjectProperty<Image>`	`image`	The image to display when the cursor is active.

Field Summary

Fields declared in class javafx.scene.Cursor

CLOSED_HAND, CROSSHAIR, DEFAULT, DISAPPEAR, E_RESIZE, H_RESIZE, HAND, MOVE, N_RESIZE, NE_RESIZE, NONE, NW_RESIZE, OPEN_HAND, S_RESIZE, SE_RESIZE, SW_RESIZE, TEXT, V_RESIZE, W_RESIZE, WAIT

Constructor Summary

Constructors
Constructor	Description
`ImageCursor()`	Constructs a new empty `ImageCursor` which will look as `Cursor.DEFAULT`.
`ImageCursor(Image image)`	Constructs an `ImageCursor` from the specified image.
`ImageCursor(Image image, double hotspotX, double hotspotY)`	Constructs an `ImageCursor` from the specified image and hotspot coordinates.

Method Summary

Modifier and Type	Method	Description
`static ImageCursor`	`chooseBestCursor(Image[] images, double hotspotX, double hotspotY)`	Creates a custom image cursor from one of the specified images.
`static Dimension2D`	`getBestSize(double preferredWidth, double preferredHeight)`	Gets the supported cursor size that is closest to the specified preferred size.
`double`	`getHotspotX()`	Gets the value of the property hotspotX.
`double`	`getHotspotY()`	Gets the value of the property hotspotY.
`Image`	`getImage()`	Gets the value of the property image.
`static int`	`getMaximumColors()`	Returns the maximum number of colors supported in a custom image cursor palette.
`ReadOnlyDoubleProperty`	`hotspotXProperty()`	The X coordinate of the cursor's hot spot.
`ReadOnlyDoubleProperty`	`hotspotYProperty()`	The Y coordinate of the cursor's hot spot.
`ReadOnlyObjectProperty<Image>`	`imageProperty()`	The image to display when the cursor is active.

Methods declared in class javafx.scene.Cursor

cursor, toString

Methods declared in class java.lang.Object

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

Property Details

image

public final ReadOnlyObjectProperty<Image> imageProperty

The image to display when the cursor is active. If the image is null, Cursor.DEFAULT will be used.

Default value:: null
See Also:: getImage()

hotspotX

public final ReadOnlyDoubleProperty hotspotXProperty

The X coordinate of the cursor's hot spot. This hotspot represents the location within the cursor image that will be displayed at the mouse position. This must be in the range of [0,image.width-1]. A value less than 0 will be set to 0. A value greater than image.width-1 will be set to image.width-1.

Default value:: 0
See Also:: getHotspotX()

hotspotY

public final ReadOnlyDoubleProperty hotspotYProperty

The Y coordinate of the cursor's hot spot. This hotspot represents the location within the cursor image that will be displayed at the mouse position. This must be in the range of [0,image.height-1]. A value less than 0 will be set to 0. A value greater than image.height-1 will be set to image.height-1.

Default value:: 0
See Also:: getHotspotY()

Constructor Details

ImageCursor

public ImageCursor()

Constructs a new empty ImageCursor which will look as Cursor.DEFAULT.

ImageCursor

public ImageCursor(Image image)

Constructs an ImageCursor from the specified image. The cursor's hot spot will default to the upper left corner.

Parameters:: image - the image

ImageCursor

public ImageCursor(Image image, double hotspotX, double hotspotY)

Constructs an ImageCursor from the specified image and hotspot coordinates.

Parameters:: image - the image; hotspotX - the X coordinate of the cursor's hot spot; hotspotY - the Y coordinate of the cursor's hot spot

Method Details

getImage

public final Image getImage()

Gets the value of the property image.

Property description:: The image to display when the cursor is active. If the image is null, Cursor.DEFAULT will be used.
Default value:: null

imageProperty

public final ReadOnlyObjectProperty<Image> imageProperty()

The image to display when the cursor is active. If the image is null, Cursor.DEFAULT will be used.

Default value:: null
See Also:: getImage()

getHotspotX

public final double getHotspotX()

Gets the value of the property hotspotX.

Property description:: The X coordinate of the cursor's hot spot. This hotspot represents the location within the cursor image that will be displayed at the mouse position. This must be in the range of [0,image.width-1]. A value less than 0 will be set to 0. A value greater than image.width-1 will be set to image.width-1.
Default value:: 0

hotspotXProperty

public final ReadOnlyDoubleProperty hotspotXProperty()

Default value:: 0
See Also:: getHotspotX()

getHotspotY

public final double getHotspotY()

Gets the value of the property hotspotY.

Property description:: The Y coordinate of the cursor's hot spot. This hotspot represents the location within the cursor image that will be displayed at the mouse position. This must be in the range of [0,image.height-1]. A value less than 0 will be set to 0. A value greater than image.height-1 will be set to image.height-1.
Default value:: 0

hotspotYProperty

public final ReadOnlyDoubleProperty hotspotYProperty()

Default value:: 0
See Also:: getHotspotY()

getBestSize

public static Dimension2D getBestSize(double preferredWidth, double preferredHeight)

Gets the supported cursor size that is closest to the specified preferred size. A value of (0,0) is returned if the platform does not support custom cursors.

Note: if an image is used whose dimensions don't match a supported size (as returned by this method), the implementation will resize the image to a supported size. This may result in a loss of quality.

Note: These values can vary between operating systems, graphics cards and screen resolution, but at the time of this writing, a sample Windows Vista machine returned 32x32 for all requested sizes, while sample Mac and Linux machines returned the requested size up to a maximum of 64x64. Applications should provide a 32x32 cursor, which will work well on all platforms, and may optionally wish to provide a 64x64 cursor for those platforms on which it is supported.

Parameters:: preferredWidth - the preferred width of the cursor; preferredHeight - the preferred height of the cursor
Returns:: the supported cursor size

getMaximumColors

public static int getMaximumColors()

Returns the maximum number of colors supported in a custom image cursor palette.

Note: if an image is used which has more colors in its palette than the supported maximum, the implementation will attempt to flatten the palette to the maximum. This may result in a loss of quality.

Note: These values can vary between operating systems, graphics cards and screen resolution, but at the time of this writing, a sample Windows Vista machine returned 256, a sample Mac machine returned Integer.MAX_VALUE, indicating support for full color cursors, and a sample Linux machine returned 2. Applications may want to target these three color depths for an optimal cursor on each platform.

Returns:: the maximum number of colors supported in a custom image cursor palette

chooseBestCursor

public static ImageCursor chooseBestCursor(Image[] images, double hotspotX, double hotspotY)

Creates a custom image cursor from one of the specified images. This function will choose the image whose size most closely matched the best cursor size. The hotpotX of the returned ImageCursor is scaled by chosenImage.width/images[0].width and the hotspotY is scaled by chosenImage.height/images[0].height.

On platforms that don't support custom cursors, Cursor.DEFAULT will be used in place of the returned ImageCursor.

Parameters:: images - a sequence of images from which to choose, in order of preference; hotspotX - the X coordinate of the hotspot within the first image in the images sequence; hotspotY - the Y coordinate of the hotspot within the first image in the images sequence
Returns:: a cursor created from the best image

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Documentation extracted from JavaFX API Documentation.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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