javafx.scene.layout.Background Maven / Gradle / Ivy
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package javafx.scene.layout;
import javafx.beans.NamedArg;
import javafx.css.CssMetaData;
import javafx.css.Styleable;
import javafx.geometry.Insets;
import javafx.scene.Node;
import javafx.scene.image.Image;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import com.sun.javafx.UnmodifiableArrayList;
import com.sun.javafx.css.SubCssMetaData;
import javafx.css.converter.InsetsConverter;
import javafx.css.converter.PaintConverter;
import javafx.css.converter.URLConverter;
import com.sun.javafx.scene.layout.region.LayeredBackgroundPositionConverter;
import com.sun.javafx.scene.layout.region.LayeredBackgroundSizeConverter;
import com.sun.javafx.scene.layout.region.CornerRadiiConverter;
import com.sun.javafx.scene.layout.region.RepeatStruct;
import com.sun.javafx.scene.layout.region.RepeatStructConverter;
import com.sun.javafx.tk.Toolkit;
/**
* The Background of a {@link Region}. A Background is an immutable object which
* encapsulates the entire set of data required to render the background
* of a Region. Because this class is immutable, you can freely reuse the same
* Background on many different Regions. Please refer to
* JavaFX CSS Reference Guide for a
* complete description of the CSS rules for styling the background of a Region.
*
* Every Background is comprised of {@link #getFills() fills} and / or
* {@link #getImages() images}. Neither list will ever be null, but either or
* both may be empty. Each defined {@link BackgroundFill} is rendered in order,
* followed by each defined {@link BackgroundImage}.
*
* The Background's {@link #getOutsets() outsets} define any extension of the drawing area of a Region
* which is necessary to account for all background drawing. These outsets are strictly
* defined by the BackgroundFills that are specified on this Background, if any, because
* all BackgroundImages are clipped to the drawing area, and do not define it. The
* outsets values are strictly non-negative.
*
* @since JavaFX 8.0
*/
@SuppressWarnings("unchecked")
public final class Background {
static final CssMetaData BACKGROUND_COLOR =
new SubCssMetaData<>("-fx-background-color",
PaintConverter.SequenceConverter.getInstance(),
new Paint[] {Color.TRANSPARENT});
static final CssMetaData BACKGROUND_RADIUS =
new SubCssMetaData<>("-fx-background-radius",
CornerRadiiConverter.getInstance(),
new CornerRadii[] {CornerRadii.EMPTY});
static final CssMetaData BACKGROUND_INSETS =
new SubCssMetaData<>("-fx-background-insets",
InsetsConverter.SequenceConverter.getInstance(),
new Insets[] {Insets.EMPTY});
static final CssMetaData BACKGROUND_IMAGE =
new SubCssMetaData<>("-fx-background-image",
URLConverter.SequenceConverter.getInstance());
static final CssMetaData BACKGROUND_REPEAT =
new SubCssMetaData<>("-fx-background-repeat",
RepeatStructConverter.getInstance(),
new RepeatStruct[] {new RepeatStruct(BackgroundRepeat.REPEAT,
BackgroundRepeat.REPEAT) });
static final CssMetaData BACKGROUND_POSITION =
new SubCssMetaData<>("-fx-background-position",
LayeredBackgroundPositionConverter.getInstance(),
new BackgroundPosition[] { BackgroundPosition.DEFAULT });
static final CssMetaData BACKGROUND_SIZE =
new SubCssMetaData<>("-fx-background-size",
LayeredBackgroundSizeConverter.getInstance(),
new BackgroundSize[] { BackgroundSize.DEFAULT } );
private static final List> STYLEABLES =
(List>) (List) Collections.unmodifiableList(
// Unchecked!
Arrays.asList(BACKGROUND_COLOR,
BACKGROUND_INSETS,
BACKGROUND_RADIUS,
BACKGROUND_IMAGE,
BACKGROUND_REPEAT,
BACKGROUND_POSITION,
BACKGROUND_SIZE));
/**
* @return The CssMetaData associated with this class, which may include the
* CssMetaData of its superclasses.
*/
public static List> getClassCssMetaData() {
return STYLEABLES;
}
/**
* An empty Background, useful to use instead of null.
*/
public static final Background EMPTY = new Background((BackgroundFill[])null, null);
/**
* The list of BackgroundFills which together define the filled portion
* of this Background. This List is unmodifiable and immutable. It
* will never be null. The elements of this list will also never be null.
* @return the list of BackgroundFills
*/
public final List getFills() { return fills; }
final List fills;
/**
* The list of BackgroundImages which together define the image portion
* of this Background. This List is unmodifiable and immutable. It
* will never be null. The elements of this list will also never be null.
* @return the list of BackgroundImages
*/
public final List getImages() { return images; }
final List images;
/**
* The outsets of this Background. This represents the largest
* bounding rectangle within which all drawing for the Background
* will take place. The outsets will never be negative, and represent
* the distance from the edge of the Region outward. Any BackgroundImages
* which would extend beyond the outsets will be clipped. Only the
* BackgroundFills contribute to the outsets.
* @return the outsets
*/
public final Insets getOutsets() { return outsets; }
final Insets outsets;
/**
* Gets whether the background is empty. It is empty if there are no fills or images.
* @return true if the Background is empty, false otherwise.
*/
public final boolean isEmpty() {
return fills.isEmpty() && images.isEmpty();
}
/**
* Specifies whether the Background has at least one opaque fill.
*/
private final boolean hasOpaqueFill;
/**
* Package-private immutable fields referring to the opaque insets
* of this Background.
*/
private final double opaqueFillTop, opaqueFillRight, opaqueFillBottom, opaqueFillLeft;
final boolean hasPercentageBasedOpaqueFills;
/**
* True if there are any fills that are in some way based on the size of the region.
* For example, if a CornerRadii on the fill is percentage based in either or both
* dimensions.
*/
final boolean hasPercentageBasedFills;
/**
* The cached hash code computation for the Background. One very big
* reason for making Background immutable was to make it possible to
* cache and reuse the same Background instance for multiple
* Regions (for example, every un-hovered Button should have the same
* Background instance). To enable efficient caching, we cache the hash.
*/
private final int hash;
/**
* Create a new Background by supplying an array of BackgroundFills.
* This array may be null, or may contain null values. Any null values
* will be ignored and will not contribute to the {@link #getFills() fills}
* or {@link #getOutsets() outsets}.
*
* @param fills The fills. This may be null, and may contain nulls. Any
* contained nulls are filtered out and not included in the
* final List of fills. A null array becomes an empty List.
*/
public Background(final @NamedArg("fills") BackgroundFill... fills) {
this(fills, null);
}
/**
* Create a new Background by supplying an array of BackgroundImages.
* This array may be null, or may contain null values. Any null values will
* be ignored and will not contribute to the {@link #getImages() images}.
*
* @param images The images. This may be null, and may contain nulls. Any
* contained nulls are filtered out and not included in the
* final List of images. A null array becomes an empty List.
*/
public Background(final @NamedArg("images") BackgroundImage... images) {
this(null, images);
}
/**
* Create a new Background supply two Lists, one for background fills and
* one for background images. Either list may be null, and may contain nulls.
* Any null values in these lists will be ignored and will not
* contribute to the {@link #getFills() fills}, {@link #getImages() images}, or
* {@link #getOutsets() outsets}.
*
* @param fills The fills. This may be null, and may contain nulls. Any
* contained nulls are filtered out and not included in the
* final List of fills. A null List becomes an empty List.
* @param images The images. This may be null, and may contain nulls. Any
* contained nulls are filtered out and not included in the
* final List of images. A null List becomes an empty List.
*/
public Background(final @NamedArg("fills") List fills, final @NamedArg("images") List images) {
// NOTE: This constructor had to be supplied in order to cause a Builder
// to be auto-generated, because otherwise the types of the fills and images
// properties didn't match the types of the array based constructor parameters.
// So a Builder will use this constructor, while the CSS engine uses the
// array based constructor (for speed).
this(fills == null ? null : fills.toArray(new BackgroundFill[fills.size()]),
images == null ? null : images.toArray(new BackgroundImage[images.size()]));
}
/**
* Create a new Background by supplying two arrays, one for background fills,
* and one for background images. Either array may be null, and may contain null
* values. Any null values in these arrays will be ignored and will not
* contribute to the {@link #getFills() fills}, {@link #getImages() images}, or
* {@link #getOutsets() outsets}.
*
* @param fills The fills. This may be null, and may contain nulls. Any
* contained nulls are filtered out and not included in the
* final List of fills. A null array becomes an empty List.
* @param images The images. This may be null, and may contain nulls. Any
* contained nulls are filtered out and not included in the
* final List of images. A null array becomes an empty List.
*/
public Background(final @NamedArg("fills") BackgroundFill[] fills, final @NamedArg("images") BackgroundImage[] images) {
// The cumulative insets
double outerTop = 0, outerRight = 0, outerBottom = 0, outerLeft = 0;
boolean hasPercentOpaqueInsets = false;
boolean hasPercentFillRadii = false;
boolean opaqueFill = false;
// If the fills is empty or null then we know we can just use the shared
// immutable empty list from Collections.
if (fills == null || fills.length == 0) {
this.fills = Collections.emptyList();
} else {
// We need to iterate over all of the supplied elements in the fills array.
// Each null element is ignored. Each non-null element is inspected to
// see if it contributes to the outsets.
final BackgroundFill[] noNulls = new BackgroundFill[fills.length];
int size = 0;
for (int i=0; i(noNulls, size);
}
hasPercentageBasedFills = hasPercentFillRadii;
// This ensures that we either have outsets of 0, if all the insets were positive,
// or a value greater than zero if they were negative.
outsets = new Insets(
Math.max(0, -outerTop),
Math.max(0, -outerRight),
Math.max(0, -outerBottom),
Math.max(0, -outerLeft));
// An null or empty images array results in an empty list
if (images == null || images.length == 0) {
this.images = Collections.emptyList();
} else {
// Filter out any null values and create an immutable array list
final BackgroundImage[] noNulls = new BackgroundImage[images.length];
int size = 0;
for (int i=0; i(noNulls, size);
}
hasOpaqueFill = opaqueFill;
if (hasPercentOpaqueInsets) {
opaqueFillTop = Double.NaN;
opaqueFillRight = Double.NaN;
opaqueFillBottom = Double.NaN;
opaqueFillLeft = Double.NaN;
} else {
double[] trbl = new double[4];
computeOpaqueInsets(1, 1, true, trbl);
opaqueFillTop = trbl[0];
opaqueFillRight = trbl[1];
opaqueFillBottom = trbl[2];
opaqueFillLeft = trbl[3];
}
hasPercentageBasedOpaqueFills = hasPercentOpaqueInsets;
// Pre-compute the hash code. NOTE: all variables are prefixed with "this" so that we
// do not accidentally compute the hash based on the constructor arguments rather than
// based on the fields themselves!
int result = this.fills.hashCode();
result = 31 * result + this.images.hashCode();
hash = result;
}
/**
* Gets whether the fill of this Background is based on percentages (that is, relative to the
* size of the region being styled). Specifically, this returns true if any of the CornerRadii
* on any of the fills on this Background has a radius that is based on percentages.
*
* @return True if any CornerRadii of any BackgroundFill on this background would return true, false otherwise.
* @since JavaFX 8.0
*/
public boolean isFillPercentageBased() {
return hasPercentageBasedFills;
}
/**
* Computes the opaque insets for a region with the specified width and height. This call
* must be made whenever the width or height of the region change, because the opaque insets
* are based on background fills, and the corner radii of a background fill can be percentage
* based. Thus, we need to potentially recompute the opaque insets whenever the width or
* height of the region change. On the other hand, if there are no percentage based corner
* radii, then we can simply return the pre-computed and cached answers.
*
* @param width The width of the region
* @param height The height of the region
* @param trbl A four-element array of doubles in order: top, right, bottom, left.
*/
void computeOpaqueInsets(double width, double height, double[] trbl) {
computeOpaqueInsets(width, height, false, trbl);
}
/**
* Computes the opaque insets. The first time this is called from the constructor
* we want to take the long route through and compute everything, whether there are
* percentage based insets or not (the constructor ensures not to call it in the case
* that it has percentage based insets!). All other times, this is called by the other
* computeOpaqueInsets method with "firstTime" set to false, such that if we have
* percentage based insets, then we will bail early.
*
* This method takes into account both fills and images. Because images can be
* lazy loaded, we cannot pre-compute a bunch of things in the constructor for images
* the way we can with fills. Instead, each time the method is called, we have to
* inspect the images. However, we do have fast paths for cases where fills are used
* and not images.
*
* @param width The width of the region
* @param height The height of the region
* @param firstTime Whether this is being called from the constructor
* @param trbl A four-element array of doubles in order: top, right, bottom, left.
*/
private void computeOpaqueInsets(double width, double height, boolean firstTime, double[] trbl) {
double opaqueRegionTop = Double.NaN,
opaqueRegionRight = Double.NaN,
opaqueRegionBottom = Double.NaN,
opaqueRegionLeft = Double.NaN;
// If during object construction we determined that there is an opaque fill, then we need
// to visit the fills and figure out which ones contribute to the opaque insets
if (hasOpaqueFill) {
// If during construction time we determined that none of the fills had a percentage based
// opaque inset, then we can just use the pre-computed values. This is worth doing since
// at this time all CSS based radii for BackgroundFills are literal values!
if (!firstTime && !hasPercentageBasedOpaqueFills) {
opaqueRegionTop = opaqueFillTop;
opaqueRegionRight = opaqueFillRight;
opaqueRegionBottom = opaqueFillBottom;
opaqueRegionLeft = opaqueFillLeft;
} else {
// NOTE: We know at this point that there is an opaque fill, and that at least one
// of them uses a percentage for at least one corner radius. Iterate over each
// BackgroundFill. If the fill is opaque, then we will compute the largest rectangle
// which will fit within its opaque area, taking the corner radii into account.
// Initialize them to the "I Don't Know" answer.
for (int i=0, max=fills.size(); i= opaqueRegionTop;
final boolean largerRight = r >= opaqueRegionRight;
final boolean largerBottom = b >= opaqueRegionBottom;
final boolean largerLeft = l >= opaqueRegionLeft;
if (largerTop && largerRight && largerBottom && largerLeft) {
// The new fill is completely contained within the existing rect, so no change
continue;
} else if (!largerTop && !largerRight && !largerBottom && !largerLeft) {
// The new fill completely contains the existing rect, so use these
// new values for our opaque region
opaqueRegionTop = fillTop;
opaqueRegionRight = fillRight;
opaqueRegionBottom = fillBottom;
opaqueRegionLeft = fillLeft;
} else if (l == opaqueRegionLeft && r == opaqueRegionRight) {
// The left and right insets are the same between the two rects, so just pick
// the smallest top and bottom
opaqueRegionTop = Math.min(t, opaqueRegionTop);
opaqueRegionBottom = Math.min(b, opaqueRegionBottom);
} else if (t == opaqueRegionTop && b == opaqueRegionBottom) {
// The top and bottom are the same between the two rects so just pick
// the smallest left and right
opaqueRegionLeft = Math.min(l, opaqueRegionLeft);
opaqueRegionRight = Math.min(r, opaqueRegionRight);
} else {
// They are disjoint or overlap in some other manner. So we will just
// ignore this region.
continue;
}
}
}
}
}
}
// Check the background images. Since the image of a BackgroundImage might load asynchronously
// and since we must inspect the image to check for opacity, we just have to visit all the
// images each time this method is called rather than pre-computing results. With some work
// we could end up caching the result eventually.
final Toolkit.ImageAccessor acc = Toolkit.getImageAccessor();
for (BackgroundImage bi : images) {
if (bi.opaque == null) {
// If the image is not yet loaded, just skip it
// Note: Unit test wants this to be com.sun.javafx.tk.PlatformImage, not com.sun.prism.Image
final com.sun.javafx.tk.PlatformImage platformImage = acc.getImageProperty(bi.image).get();
if (platformImage == null) continue;
// The image has been loaded, so update the opaque flag
if (platformImage instanceof com.sun.prism.Image) {
bi.opaque = ((com.sun.prism.Image)platformImage).isOpaque();
} else {
continue;
}
}
// At this point we know that we're processing an image which has already been resolved
// and we know whether it is opaque or not. Of course, we only care about processing
// opaque images.
if (bi.opaque) {
if (bi.size.cover ||
(bi.size.height == BackgroundSize.AUTO && bi.size.width == BackgroundSize.AUTO &&
bi.size.widthAsPercentage && bi.size.heightAsPercentage)) {
// If the size mode is "cover" or AUTO, AUTO, and percentage based, then we're done -- we can simply
// accumulate insets of "0"
opaqueRegionTop = Double.isNaN(opaqueRegionTop) ? 0 : Math.min(0, opaqueRegionTop);
opaqueRegionRight = Double.isNaN(opaqueRegionRight) ? 0 : Math.min(0, opaqueRegionRight);
opaqueRegionBottom = Double.isNaN(opaqueRegionBottom) ? 0 : Math.min(0, opaqueRegionBottom);
opaqueRegionLeft = Double.isNaN(opaqueRegionLeft) ? 0 : Math.min(0, opaqueRegionLeft);
break;
} else {
// Here we are taking into account all potential tiling cases including "contain". Basically,
// as long as the repeat is *not* SPACE, we know that we'll be touching every pixel, and we
// don't really care how big the tiles end up being. The only case where we care about the
// actual tile size is in the NO_REPEAT modes.
// If the repeatX or repeatY includes "SPACE" Then we bail, because we can't be happy about
// spaces strewn about within the region.
if (bi.repeatX == BackgroundRepeat.SPACE || bi.repeatY == BackgroundRepeat.SPACE) {
bi.opaque = false; // We'll treat it as false in the future
continue;
}
// If the repeatX and repeatY are "REPEAT" and/or "ROUND" (any combination thereof) then
// we know all pixels within the region width / height are being touched, so we can just
// set the opaqueRegion variables and we're done.
final boolean filledX = bi.repeatX == BackgroundRepeat.REPEAT || bi.repeatX == BackgroundRepeat.ROUND;
final boolean filledY = bi.repeatY == BackgroundRepeat.REPEAT || bi.repeatY == BackgroundRepeat.ROUND;
if (filledX && filledY) {
opaqueRegionTop = Double.isNaN(opaqueRegionTop) ? 0 : Math.min(0, opaqueRegionTop);
opaqueRegionRight = Double.isNaN(opaqueRegionRight) ? 0 : Math.min(0, opaqueRegionRight);
opaqueRegionBottom = Double.isNaN(opaqueRegionBottom) ? 0 : Math.min(0, opaqueRegionBottom);
opaqueRegionLeft = Double.isNaN(opaqueRegionLeft) ? 0 : Math.min(0, opaqueRegionLeft);
break;
}
// We know that one or the other dimension is not filled, so we have to compute the right
// width / height. This is basically a big copy/paste from NGRegion! Blah!
final double w = bi.size.widthAsPercentage ? bi.size.width * width : bi.size.width;
final double h = bi.size.heightAsPercentage ? bi.size.height * height : bi.size.height;
final double imgUnscaledWidth = bi.image.getWidth();
final double imgUnscaledHeight = bi.image.getHeight();
// Now figure out the width and height of each tile to be drawn. The actual image
// dimensions may be one thing, but we need to figure out what the size of the image
// in the destination is going to be.
final double tileWidth, tileHeight;
if (bi.size.contain) {
// In the case of "contain", we compute the destination size based on the largest
// possible scale such that the aspect ratio is maintained, yet one side of the
// region is completely filled.
final double scaleX = width / imgUnscaledWidth;
final double scaleY = height / imgUnscaledHeight;
final double scale = Math.min(scaleX, scaleY);
tileWidth = Math.ceil(scale * imgUnscaledWidth);
tileHeight = Math.ceil(scale * imgUnscaledHeight);
} else if (bi.size.width >= 0 && bi.size.height >= 0) {
// The width and height have been expressly defined. Note that AUTO is -1,
// and all other negative values are disallowed, so by checking >= 0, we
// are essentially saying "if neither is AUTO"
tileWidth = w;
tileHeight = h;
} else if (w >= 0) {
// In this case, the width is specified, but the height is AUTO
tileWidth = w;
final double scale = tileWidth / imgUnscaledWidth;
tileHeight = imgUnscaledHeight * scale;
} else if (h >= 0) {
// Here the height is specified and the width is AUTO
tileHeight = h;
final double scale = tileHeight / imgUnscaledHeight;
tileWidth = imgUnscaledWidth * scale;
} else {
// Both are auto.
tileWidth = imgUnscaledWidth;
tileHeight = imgUnscaledHeight;
}
opaqueRegionTop = Double.isNaN(opaqueRegionTop) ? 0 : Math.min(0, opaqueRegionTop);
opaqueRegionRight = Double.isNaN(opaqueRegionRight) ? (width - tileWidth) : Math.min(width - tileWidth, opaqueRegionRight);
opaqueRegionBottom = Double.isNaN(opaqueRegionBottom) ? (height - tileHeight) : Math.min(height - tileHeight, opaqueRegionBottom);
opaqueRegionLeft = Double.isNaN(opaqueRegionLeft) ? 0 : Math.min(0, opaqueRegionLeft);
}
}
}
trbl[0] = opaqueRegionTop;
trbl[1] = opaqueRegionRight;
trbl[2] = opaqueRegionBottom;
trbl[3] = opaqueRegionLeft;
}
/**
* {@inheritDoc}
*/
@Override public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Background that = (Background) o;
// Because the hash is cached, this can be a very fast check
if (hash != that.hash) return false;
if (!fills.equals(that.fills)) return false;
if (!images.equals(that.images)) return false;
return true;
}
/**
* {@inheritDoc}
*/
@Override public int hashCode() {
return hash;
}
}