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| public class TimelineView extends Region {
private final Region axis = new Region();
private final Path ticks = new Path();
private final Pane tickLabels = new Pane();
public TimelineView() {
super();
setId("timelimeView");
getStyleClass().add("timeline-view");
axis.setId("axis");
axis.getStyleClass().add("axis");
ticks.setId("ticks");
ticks.getStyleClass().add("ticks");
tickLabels.setId("tickLabels");
tickLabels.getStyleClass().add("tick-labels");
getChildren().addAll(axis, ticks, tickLabels);
startDateProperty().addListener(timelineChangeListener);
endDateProperty().addListener(timelineChangeListener);
tickUnitProperty().addListener(timelineChangeListener);
tickLengthProperty().addListener(timelineChangeListener);
widthProperty().addListener(timelineChangeListener);
heightProperty().addListener(timelineChangeListener);
}
@Override
public String getUserAgentStylesheet() {
final URL url = getClass().getResource("timelineview.css");
return (url == null) ? null : url.toExternalForm();
}
@Override
protected void layoutChildren() {
super.layoutChildren();
final double width = getWidth();
final double height = getHeight();
final Insets insets = getInsets();
final double areaX = insets.getLeft();
final double areaY = insets.getTop();
final double areaW = Math.max(0, width - insets.getLeft() - insets.getRight());
final double areaH = Math.max(0, height - insets.getTop() - insets.getBottom());
layoutChildrenInArea(areaX, areaY, areaW, areaH);
}
private int clamp(final double position) {
return (int) Math.round(position);
}
private void layoutChildrenInArea(final double areaX, final double areaY, final double areaW, final double areaH) {
final int axisX = clamp(areaX);
final int axisY = clamp(areaY + areaH * 2 / 3d);
final int axisW = clamp(areaW);
final int axisH = clamp(axis.getPrefHeight());
layoutInArea(axis, axisX, axisY, axisW, axisH, 0, HPos.LEFT, VPos.TOP);
//
final Period tickUnit = getTickUnit();
LocalDate startDate = getStartDate();
LocalDate endDate = getEndDate();
if (startDate.isAfter(endDate)) {
LocalDate tmp = startDate;
startDate = endDate;
endDate = tmp;
}
final List<LocalDate> calendar = new LinkedList();
for (LocalDate currentDate = startDate; currentDate.isBefore(endDate) || currentDate.isEqual(endDate); currentDate = currentDate.plus(tickUnit)) {
calendar.add(currentDate);
}
final int tickCount = calendar.size();
if (tickCount > 0 && ticks.getElements().isEmpty()) {
final DateTimeFormatter yearExtractor = DateTimeFormatter.ofPattern("YYYY");
final double tickDistance = axisW / Math.max(1, tickCount - 1);
final int tickY = axisY + axisH;
final double tickLength = Math.max(0, getTickLength());
for (int tickIndex = 0; tickIndex < tickCount; tickIndex++) {
final int tickX = clamp(axisX + tickIndex * tickDistance);
if (tickLength > 0) {
ticks.getElements().add(new MoveTo(tickX, tickY));
ticks.getElements().add(new LineTo(tickX, tickY + tickLength));
}
final LocalDate currentDate = calendar.get(tickIndex);
final String text = currentDate.format(yearExtractor);
final Text tickLabel = new Text(text);
tickLabel.setId("tickLabel");
tickLabel.getStyleClass().add("tick-label");
tickLabel.setTextOrigin(VPos.TOP);
tickLabels.getChildren().add(tickLabel);
}
// We need to apply CSS 1st for proper layout.
applyCss();
for (int tickIndex = 0; tickIndex < tickCount; tickIndex++) {
final int tickX = clamp(axisX + tickIndex * tickDistance);
final Text tickLabel = (Text) tickLabels.getChildren().get(tickIndex);
final int labelX = clamp(tickX - tickLabel.getBoundsInLocal().getWidth() / 2d);
final int labelY = clamp(tickY + tickLength + 5);
tickLabel.setLayoutX(labelX);
tickLabel.setLayoutY(labelY);
}
}
}
private final ReadOnlyObjectWrapper<LocalDate> startDate = new ReadOnlyObjectWrapper<>(this, "startDate", LocalDate.parse("1900-01-01"));
public final LocalDate getStartDate() {
return startDate.get();
}
public final void setStartDate(final LocalDate value) throws NullPointerException {
Objects.requireNonNull(value);
startDate.set(value);
}
public final ReadOnlyObjectProperty<LocalDate> startDateProperty() {
return startDate.getReadOnlyProperty();
}
private final ReadOnlyObjectWrapper<LocalDate> endDate = new ReadOnlyObjectWrapper<>(this, "endDate", LocalDate.parse("2000-01-01"));
public final LocalDate getEndDate() {
return endDate.get();
}
public final void setEndDate(final LocalDate value) throws NullPointerException {
Objects.requireNonNull(value);
endDate.set(value);
}
public final ReadOnlyObjectProperty<LocalDate> endDateProperty() {
return endDate.getReadOnlyProperty();
}
private final ReadOnlyObjectWrapper<Period> tickUnit = new ReadOnlyObjectWrapper<>(this, "tickUnit", Period.ofYears(10));
public final Period getTickUnit() {
return tickUnit.get();
}
public final void setTickUnit(final Period value) throws NullPointerException {
Objects.requireNonNull(value);
tickUnit.set(value);
}
public final ReadOnlyObjectProperty<Period> tickUnitProperty() {
return tickUnit.getReadOnlyProperty();
}
private final DoubleProperty tickLength = new SimpleDoubleProperty(this, "tickLength", 15);
public final double getTickLength() {
return tickLength.get();
}
public final void setTickLength(final double value) {
tickLength.set(value);
}
public final DoubleProperty tickLengthProperty() {
return tickLength;
}
private final ChangeListener timelineChangeListener = (observable, oldValue, newValue) -> {
ticks.getElements().clear();
tickLabels.getChildren().clear();
requestLayout();
};
} |
