Swing/CompoundButton の変更点

---
category: swing
folder: CompoundButton
title: OverlayLayoutで複数のJButtonを重ねて複合ボタンを作成
tags: [OverlayLayout, JButton, Icon]
author: aterai
pubdate: 2012-11-26T15:04:48+09:00
description: 4つの扇形ボタンと円形ボタンを、OverlayLayoutを設定したJPanelに配置して、複合ボタンを作成します。
image: https://lh6.googleusercontent.com/-0bLp9wWHHOw/ULIxE5DUtzI/AAAAAAAABX4/pRUF7k-l4D0/s800/CompoundButton.png
hreflang:
    href: https://java-swing-tips.blogspot.com/2012/12/combine-five-jbuttons-to-make.html
    lang: en
---
* Summary [#summary]
`4`つの扇形ボタンと円形ボタンを、`OverlayLayout`を設定した`JPanel`に配置して、複合ボタンを作成します。

#download(https://lh6.googleusercontent.com/-0bLp9wWHHOw/ULIxE5DUtzI/AAAAAAAABX4/pRUF7k-l4D0/s800/CompoundButton.png)

* Source Code Examples [#sourcecode]
#code(link){{
private static JComponent makeCompoundButton(final Dimension d) {
  JPanel p = new JPanel() {
    @Override public Dimension getPreferredSize() {
      return d;
    }
  };
  p.setLayout(new OverlayLayout(p));
  p.add(new CompoundButton(d, ButtonLocation.NORTH));
  p.add(new CompoundButton(d, ButtonLocation.SOUTH));
  p.add(new CompoundButton(d, ButtonLocation.EAST));
  p.add(new CompoundButton(d, ButtonLocation.WEST));
  p.add(new CompoundButton(d, ButtonLocation.CENTER));
  return p;
}

class CompoundButton extends JButton {
  protected final Color fc = new Color(100, 150, 255, 200);
  protected final Color ac = new Color(230, 230, 230);
  protected final Color rc = Color.ORANGE;
  protected Shape shape;
  protected Shape base = null;
  private final ButtonLocation bl;
  private final Dimension dim;
  public CompoundButton(Dimension d, ButtonLocation bl) {
    super();
    this.dim = d;
    this.bl = bl;
    setIcon(new Icon() {
      @Override public void paintIcon(Component c, Graphics g, int x, int y) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if (getModel().isArmed()) {
          g2.setColor(ac);
          g2.fill(shape);
        } else if (isRolloverEnabled() && getModel().isRollover()) {
          paintFocusAndRollover(g2, rc);
        } else if (hasFocus()) {
          paintFocusAndRollover(g2, fc);
        } else {
          g2.setColor(getBackground());
          g2.fill(shape);
        }
        g2.dispose();
      }

      @Override public int getIconWidth()  {
        return dim.width;
      }

      @Override public int getIconHeight() {
        return dim.height;
      }
    });
    setFocusPainted(false);
    setContentAreaFilled(false);
    setBackground(new Color(250, 250, 250));
    initShape();
  }

  @Override public Dimension getPreferredSize() {
    return dim;
  }

  protected void initShape() {
    if (!getBounds().equals(base)) {
      base = getBounds();
      float ww = getWidth() * .5f;
      float xx = ww * .5f;
      Shape inner = new Ellipse2D.Float(xx, xx, ww, ww);
      if (ButtonLocation.CENTER == bl) {
        shape = inner;
      } else {
        Shape outer = new Arc2D.Float(
          1, 1, getWidth() - 2, getHeight() - 2,
          bl.getStartDegree(), 90f, Arc2D.PIE);
        Area area = new Area(outer);
        area.subtract(new Area(inner));
        shape = area;
      }
    }
  }

  private void paintFocusAndRollover(Graphics2D g2, Color color) {
    g2.setPaint(new GradientPaint(
        0, 0, color, getWidth() - 1, getHeight() - 1, color.brighter(), true));
    g2.fill(shape);
    g2.setColor(getBackground());
  }

  @Override protected void paintComponent(Graphics g) {
    initShape();
    super.paintComponent(g);
  }

  @Override protected void paintBorder(Graphics g) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(getForeground());
    g2.draw(shape);
    g2.dispose();
  }

  @Override public boolean contains(int x, int y) {
    // initShape();
    return shape.contains(x, y);
  }
}
}}

* Description [#explanation]
* Description [#description]
- 円形ボタン
-- [[JButtonの形を変更>Swing/RoundButton]]を使って幅高さの半分の直径をもつ円ボタンを作成
-- `JButton#contains(...)`をオーバーライドして図形内のみマウスカーソルが反応するように変更
- 扇形ボタン
-- 東西南北に`4`つ配置するので内角は`90`度、始角はそれぞれ`45`、`135`、`225`、`-45`度で`Arc2D`を作成
-- これらの`Arc2D`から`Area#subtract(Area)`メソッドを使用して上記の円形ボタンの領域を除去し扇形に変形
--- [[Mouseで画像を移動、回転>Swing/MouseDrivenImageRotation]]
-- `JButton#contains(...)`をオーバーライドして図形内のみマウスカーソルが反応するように変更
- 複合ボタン
-- `5`つのボタンを`OverlayLayout`を設定した`JPanel`に配置
-- `JPanel#getPreferredSize()`をオーバーライドしてサイズが`5`つのボタンですべて同じになるよう設定
--- [[OverlayLayoutの使用>Swing/OverlayLayout]]
-- これらの`5`つのボタンはクリック可能な領域が重なることはないので、[https://docs.oracle.com/javase/jp/8/docs/api/javax/swing/JComponent.html#isOptimizedDrawingEnabled-- JComponent#isOptimizedDrawingEnabled()]メソッドをオーバーライドする必要はない

* Reference [#reference]
- [[OverlayLayoutの使用>Swing/OverlayLayout]]
- [[JButtonの形を変更>Swing/RoundButton]]
- [[Mouseで画像を移動、回転>Swing/MouseDrivenImageRotation]]

* Comment [#comment]
#comment
#comment