doubleheadedscrollbar.java

来自「一本有关Java图形界面设计的一本书,英文的,附带有源码,」· Java 代码 · 共 28 行

import javax.swing.JScrollBar;
import javax.swing.plaf.ScrollBarUI;

/**
 * DoubleHeadedScrollbar is a scrollbar with one additional feature:
 * you can resize the thumb using draggable buttons at each end of it.
 * For simplicity, this DoubleHeadedScrollbar can only be horizontal
 * (those this can easily be fixed with a little more coding).
 */
public class DoubleHeadedScrollbar extends JScrollBar {

    /**
     * Make a horizontal DoubleHeadedScrollbar.
     * @param value initial value
     * @param extent size of visible area (thumb size)
     * @param min minimum value
     * @param max maximum value 
     */
    public DoubleHeadedScrollbar(int value, int extent, int min, int max) {
        super(HORIZONTAL, value, extent, min, max);
    }
    
    // override setUI() to always use our own look-and-feel.
    public void setUI(ScrollBarUI ui) {
        super.setUI(new DoubleHeadedScrollbarUI());
    }
}