javafx-2 - Javafx旋转标签问题

Question

当我尝试将标签旋转270 label.setRotate(270)时遇到问题。

但是标签文本消失。

这是代码示例。

LineChart chart = new LineChart(new CategoryAxis(), new NumberAxis());
chart.setLegendVisible(false); 

/**
 * Grid pane which contain the charts and vertical label to indicate for the row title
 */
GridPane root = new GridPane();
root.add(chart, 0, 0);

/**
 * Want to add vertical label to refer to the row title.
 */
Label label = new Label("Row Title");
label.setRotate(270);
// label.setMinWidth(200); 

root.add(label, 1, 0);

更新

当我尝试使用setMinWidth(200)时，出现另一个问题。

Answer 1

问题在于，向标签添加旋转不会影响其布局范围。就布局而言，标签仍然是水平控件。

将其包装在Group中将解决大多数问题，因为该小组将考虑转换。但是，诸如标签中文本的自动换行之类的功能将不再起作用。

如果还需要在垂直标签中自动换行，那么我们需要创建自己的VerticalLabel类，该类在垂直显示时重用Label完成的复杂换行计算。

要真正得到支持，此功能实际上应该是Label类本身的一部分，但是可以通过新控件解决该功能。



这是代码:

import javafx.beans.property.BooleanProperty;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.StringProperty;
import javafx.geometry.Insets;
import javafx.geometry.Orientation;
import javafx.geometry.VerticalDirection;
import javafx.scene.Node;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.Label;
import javafx.scene.control.OverrunStyle;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Paint;
import javafx.scene.text.Font;
import javafx.scene.text.TextAlignment;
import javafx.scene.transform.Rotate;

public class VerticalLabel extends Pane {
  private final InternalLabel label = new InternalLabel();
  private final VerticalDirection direction;

  public VerticalLabel(VerticalDirection direction) {
    this.direction = direction;
    this.label.getTransforms().add(new Rotate(direction == VerticalDirection.DOWN ? 90 : -90, 0, 0));
    this.label.setManaged(false);
    this.getChildren().add(label);
  }

  // Content bias is Vertical if text wrapping is active: 

  @Override
  public Orientation getContentBias() {
    return label.isWrapText() ? Orientation.VERTICAL : null;
  }

  @Override
  protected void layoutChildren() {
    super.layoutChildren();

    label.resizeRelocate(direction == VerticalDirection.DOWN ? getWidth() : 0, direction == VerticalDirection.DOWN ? 0 : getHeight(), getHeight(), getWidth());
  }

  // Compute methods, with width and height swapped around:

  @Override
  protected double computePrefWidth(double height) {
    return label.computePrefHeight(height);
  }

  @Override
  protected double computePrefHeight(double width) {
    return label.computePrefWidth(width);
  }

  @Override
  protected double computeMaxWidth(double height) {
    return label.computeMaxHeight(height);
  }

  @Override
  protected double computeMaxHeight(double width) {
    return label.computeMaxWidth(width);
  }

  @Override
  protected double computeMinWidth(double height) {
    return label.computeMinHeight(height);
  }

  @Override
  protected double computeMinHeight(double width) {
    return label.computeMinWidth(width);
  }

  // Delegate methods:

  public ObjectProperty<Node> labelForProperty() {
    return label.labelForProperty();
  }

  public final StringProperty textProperty() {
    return label.textProperty();
  }

  public final String getText() {
    return label.getText();
  }

  public void setText(String text) {
    label.setText(text);
  }

  public final void setLabelFor(Node value) {
    label.setLabelFor(value);
  }

  public final Node getLabelFor() {
    return label.getLabelFor();
  }

  public final ObjectProperty<TextAlignment> textAlignmentProperty() {
    return label.textAlignmentProperty();
  }

  public final void setTextAlignment(TextAlignment value) {
    label.setTextAlignment(value);
  }

  public final TextAlignment getTextAlignment() {
    return label.getTextAlignment();
  }

  public final ObjectProperty<OverrunStyle> textOverrunProperty() {
    return label.textOverrunProperty();
  }

  public final void setTextOverrun(OverrunStyle value) {
    label.setTextOverrun(value);
  }

  public final OverrunStyle getTextOverrun() {
    return label.getTextOverrun();
  }

  public final StringProperty ellipsisStringProperty() {
    return label.ellipsisStringProperty();
  }

  public final void setEllipsisString(String value) {
    label.setEllipsisString(value);
  }

  public final String getEllipsisString() {
    return label.getEllipsisString();
  }

  public final BooleanProperty wrapTextProperty() {
    return label.wrapTextProperty();
  }

  public final boolean isWrapText() {
    return label.isWrapText();
  }

  public void setWrapText(boolean wrapText) {
    label.setWrapText(wrapText);
  }

  public final ObjectProperty<Font> fontProperty() {
    return label.fontProperty();
  }

  public final void setFont(Font value) {
    label.setFont(value);
  }

  public final Font getFont() {
    return label.getFont();
  }

  public final ObjectProperty<Node> graphicProperty() {
    return label.graphicProperty();
  }

  public final void setGraphic(Node value) {
    label.setGraphic(value);
  }

  public final Node getGraphic() {
    return label.getGraphic();
  }

  public final ObjectProperty<ContextMenu> contextMenuProperty() {
    return label.contextMenuProperty();
  }

  public final void setContextMenu(ContextMenu value) {
    label.setContextMenu(value);
  }

  public final BooleanProperty underlineProperty() {
    return label.underlineProperty();
  }

  public final void setUnderline(boolean value) {
    label.setUnderline(value);
  }

  public final DoubleProperty lineSpacingProperty() {
    return label.lineSpacingProperty();
  }

  public final void setLineSpacing(double value) {
    label.setLineSpacing(value);
  }

  public final double getLineSpacing() {
    return label.getLineSpacing();
  }

  public final ObjectProperty<ContentDisplay> contentDisplayProperty() {
    return label.contentDisplayProperty();
  }

  public final void setContentDisplay(ContentDisplay value) {
    label.setContentDisplay(value);
  }

  public final ReadOnlyObjectProperty<Insets> labelPaddingProperty() {
    return label.labelPaddingProperty();
  }

  public final Insets getLabelPadding() {
    return label.getLabelPadding();
  }

  public final DoubleProperty graphicTextGapProperty() {
    return label.graphicTextGapProperty();
  }

  public final void setGraphicTextGap(double value) {
    label.setGraphicTextGap(value);
  }

  public final double getGraphicTextGap() {
    return label.getGraphicTextGap();
  }

  public final void setTextFill(Paint value) {
    label.setTextFill(value);
  }

  public final Paint getTextFill() {
    return label.getTextFill();
  }

  public final ObjectProperty<Paint> textFillProperty() {
    return label.textFillProperty();
  }

  public final BooleanProperty mnemonicParsingProperty() {
    return label.mnemonicParsingProperty();
  }

  /**
   * Inner class to make compute(...) methods accessible.
   */
  private class InternalLabel extends Label {
    @Override
    public double computePrefWidth(double height) {
      return super.computePrefWidth(height);
    }

    @Override
    public double computePrefHeight(double width) {
      return super.computePrefHeight(width);
    }

    @Override
    public double computeMaxWidth(double height) {
      return super.computeMaxWidth(height);
    }

    @Override
    public double computeMaxHeight(double width) {
      return super.computeMaxHeight(width);
    }

    @Override
    public double computeMinWidth(double height) {
      return super.computeMinWidth(height);
    }

    @Override
    public double computeMinHeight(double width) {
      return super.computeMinHeight(width);
    }
  }
}