Swing/AutoScroll のバックアップの現在との差分(No.12)

JScrollPaneのオートスクロール

概要

#screenshot

サンプルコード

#spanend
#spandel
class DragMoverListener extends MouseInputAdapter implements ActionListener {
#spanend
  private static final int SPEED = 2;
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* サンプルコード [#sourcecode]
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#spanadd
#code(link){{
#spanend
#spanadd
class ViewportDragScrollListener extends MouseAdapter
#spanend
                                 implements HierarchyListener {
  private static final int SPEED = 4;
  private static final int DELAY = 10;
  private final Cursor dc;
  private final Cursor hc = new Cursor(Cursor.HAND_CURSOR);
  private final Rectangle rect = new Rectangle();
  private final javax.swing.Timer scroller;
  private final Cursor hc = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
  private final Timer scroller;
  private final JComponent label;
  private final JViewport vport;
  private Point startPt = new Point();
  private Point move = new Point();
  private Point move    = new Point();

  public DragMoverListener(JViewport vport, JComponent comp) {
    this.vport = vport;
  public ViewportDragScrollListener(JComponent comp) {
    this.label = comp;
    this.dc = label.getCursor();
    this.scroller = new javax.swing.Timer(5, this);
    vport.addMouseMotionListener(this);
    vport.addMouseListener(this);
    this.dc = comp.getCursor();
    this.scroller = new Timer(DELAY, new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        Container c = SwingUtilities.getAncestorOfClass(
            JViewport.class, label);
        if (c instanceof JViewport.class) {
          JViewport vport = (JViewport) c;
          Point vp = vport.getViewPosition();
          vp.translate(move.x, move.y);
          label.scrollRectToVisible(
              new Rectangle(vp, vport.getSize()));
        }
      }
    });
  }
  public void actionPerformed(ActionEvent e) {
    Rectangle vr = vport.getViewRect();
    int w = vr.width;
    int h = vr.height;
    Point ptZero = SwingUtilities.convertPoint(vport,0,0,label);
    rect.setRect(ptZero.x-move.x, ptZero.y-move.y, w, h);
    label.scrollRectToVisible(rect);
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#spanend
  @Override public void hierarchyChanged(HierarchyEvent e) {
    JComponent c = (JComponent) e.getSource();
    if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0
        && !c.isDisplayable()) {
      scroller.stop();
    }
  }
  public void mouseDragged(MouseEvent e) {
    scroller.stop();
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#spanend
  @Override public void mouseDragged(MouseEvent e) {
    JViewport vport = (JViewport) e.getSource();
    Point pt = e.getPoint();
    move.setLocation(SPEED*(pt.x-startPt.x), SPEED*(pt.y-startPt.y));
    int dx = startPt.x - pt.x;
    int dy = startPt.y - pt.y;
    Point vp = vport.getViewPosition();
    vp.translate(dx, dy);
    label.scrollRectToVisible(new Rectangle(vp, vport.getSize()));
    move.setLocation(SPEED * dx, SPEED * dy);
    startPt.setLocation(pt);
    scroller.start();
  }
  public void mousePressed(MouseEvent e) {
    label.setCursor(hc);
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#spanend
  @Override public void mousePressed(MouseEvent e) {
    e.getComponent().setCursor(hc); // label.setCursor(hc);
    startPt.setLocation(e.getPoint());
    move.setLocation(0, 0);
    scroller.stop();
  }
  public void mouseReleased(MouseEvent e) {
    label.setCursor(dc);
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#spanend
  @Override public void mouseReleased(MouseEvent e) {
    e.getComponent().setCursor(dc); // label.setCursor(dc);
    scroller.start();
  }
  public void mouseExited(MouseEvent e) {
    label.setCursor(dc);
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#spanend
  @Override public void mouseExited(MouseEvent e) {
    e.getComponent().setCursor(dc); // label.setCursor(dc);
    move.setLocation(0, 0);
    scroller.stop();
  }
}

• &jnlp;
• &jar;
• &zip;

• javax.swing.Timerを使うことでスクロールの開始、継続、停止を実行
• 自動スクロール中に画像をマウスでクリックすると移動を停止

• JScrollPaneのViewportをマウスで掴んでスクロール
• JTextPaneで最終行に移動
  • JTextPaneで文字列を挿入したときに最後まで自動スクロールするサンプル
• 2000ピクセル以上のフリー写真素材集

• JScrollPaneのViewPortをマウスで掴んでスクロール
• JTextPaneで最終行に移動
• 2000ピクセル以上のフリー写真素材集

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