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Horizontal layout for labels which highlights a specified word. Prototype for use in https://stackoverflow.com/questions/50410373/javafxs-tableview-with-highlighted-text-and-ellipsis-functionality
.label {
-highlight-color: yellow ;
-fx-background-color: -fx-background ;
-fx-ellipsis-string: "" ;
}
.label:highlighted {
-fx-background: -highlight-color ;
}
import java.util.stream.Collectors;
import javafx.beans.property.StringProperty;
import javafx.beans.property.StringPropertyBase;
import javafx.css.PseudoClass;
import javafx.scene.Node;
import javafx.scene.control.Label;
import javafx.scene.layout.Pane;
public class HighlightingLabelLayout extends Pane {
private boolean needsRebuild = true ;
private final Label ellipsis = new Label("...");
private final StringProperty text = new StringPropertyBase() {
@Override
public String getName() {
return "text" ;
}
@Override
public Object getBean() {
return HighlightingLabelLayout.this ;
}
@Override
protected void invalidated() {
super.invalidated();
needsRebuild = true ;
requestLayout();
}
};
private final StringProperty highlightText = new StringPropertyBase() {
@Override
public String getName() {
return "highlightText" ;
}
@Override
public Object getBean() {
return HighlightingLabelLayout.this ;
}
@Override
protected void invalidated() {
super.invalidated();
needsRebuild = true ;
requestLayout();
}
};
public final StringProperty textProperty() {
return this.text;
}
public final String getText() {
return this.textProperty().get();
}
public final void setText(final String text) {
this.textProperty().set(text);
}
public final StringProperty highlightTextProperty() {
return this.highlightText;
}
public final String getHighlightText() {
return this.highlightTextProperty().get();
}
public final void setHighlightText(final String highlightText) {
this.highlightTextProperty().set(highlightText);
}
public HighlightingLabelLayout() {
ellipsis.getStyleClass().add("ellipsis");
getStylesheets().add(getClass().getResource("highlighting-label-layout.css").toExternalForm());
}
@Override
protected void layoutChildren() {
if (needsRebuild) {
rebuild() ;
}
double width = getWidth();
double x = snappedLeftInset() ;
boolean truncated = false ;
for (Node label : getChildren()) {
double labelWidth = label.prefWidth(-1);
double labelHeight = label.prefHeight(labelWidth);
if (label == ellipsis) {
label.resizeRelocate(width - labelWidth - snappedRightInset(), snappedTopInset(), labelWidth, labelHeight);
continue ;
}
if (truncated) {
label.setVisible(false);
continue ;
}
if (labelWidth + x > width - snappedLeftInset() - snappedRightInset()) {
label.resizeRelocate(x, 0, width - snappedLeftInset() - snappedRightInset() - x, labelHeight);
truncated = true ;
label.setVisible(true);
x = width - snappedRightInset();
continue ;
}
label.resizeRelocate(x, 0, labelWidth, labelHeight);
x+=labelWidth ;
}
ellipsis.setVisible(truncated);
}
@Override
protected double computePrefWidth(double height) {
if (needsRebuild) {
rebuild();
}
double width = 0 ;
for (Node label : getChildren()) {
if (label != ellipsis) {
width += label.prefWidth(height);
}
}
return width ;
}
@Override
protected double computeMaxWidth(double height) {
return computePrefWidth(height);
}
@Override
protected double computeMinWidth(double height) {
return Math.min(ellipsis.minWidth(height), computePrefWidth(height));
}
@Override
protected double computePrefHeight(double width) {
if (needsRebuild) {
rebuild();
}
double height = 0 ;
for (Node label : getChildren()) {
if (label != ellipsis) {
double labelWidth = label.prefWidth(-1);
double labelHeight = label.prefHeight(labelWidth);
if (labelHeight > height) {
height = labelHeight ;
}
}
}
return height ;
}
@Override
protected double computeMinHeight(double width) {
return Math.min(computePrefHeight(width), ellipsis.prefHeight(ellipsis.prefWidth(-1)));
}
@Override
protected double computeMaxHeight(double width) {
return computePrefHeight(width);
}
private void rebuild() {
PseudoClass highlighted = PseudoClass.getPseudoClass("highlighted");
String[] words = text.get().split("\\s");
String highlight = highlightText.get();
getChildren().clear();
StringBuffer buffer = new StringBuffer();
boolean addLeadingSpace = false ;
for (int i = 0 ; i < words.length ; i++) {
if (words[i].equals(highlight)) {
if ( i > 0) {
getChildren().add(new Label(buffer.toString()));
buffer.setLength(0);
}
Label label = new Label(words[i]);
label.pseudoClassStateChanged(highlighted, true);
addLeadingSpace = true ;
getChildren().add(label);
} else {
if (addLeadingSpace) {
buffer.append(' ');
}
buffer.append(words[i]);
if (i < words.length - 1) {
buffer.append(' ');
}
addLeadingSpace = false ;
}
}
if (buffer.length() > 0) {
getChildren().add(new Label(buffer.toString()));
}
getChildren().add(ellipsis);
System.out.println("Rebuild complete:");
System.out.println(getChildren().stream().map(Label.class::cast).map(Label::getText).map(s -> "\""+s+"\"").collect(Collectors.toList()));
needsRebuild = false ;
}
}
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