javax.swing.JScrollBar - 滚动条的实现。

javax.swing

接口

类

异常

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.JScrollBar

所有已实现的接口：: Adjustable, ImageObserver, MenuContainer, Serializable, Accessible

直接已知子类：: JScrollPane.ScrollBar

public class JScrollBar
extends JComponent

implements Adjustable, Accessible
extends JComponent
implements Adjustable, Accessible

滚动条的实现。用户在滚动条内移动滑块可确定显示区域中的内容。该程序通常将显示调整为滚动条的结束代表可显示内容的结束，或内容的 100%。滚动条的开始为可显示内容的开始，或 0%。然后滑块在其边界中的位置转换为可显示内容对应的百分比。

通常，随着滑块的位置在滚动条中的变化，将在基础视图上对 JViewport 的位置进行相应的更改，这样 JViewport 的内容也随之改变。

警告：Swing 不是线程安全的。有关更多信息，请参阅 Swing's Threading Policy。

警告：此类的序列化对象与以后的 Swing 版本不兼容。当前序列化支持适用于短期存储，或适用于在运行相同 Swing 版本的应用程序之间进行 RMI（Remote Method Invocation，远程方法调用）。从 1.4 版本开始，已在 java.beans 包中添加了支持所有 JavaBeans^TM 长期存储的功能。请参见 XMLEncoder。

另请参见：: JScrollPane

嵌套类摘要
`protected class`	`JScrollBar.AccessibleJScrollBar` 此类实现 `JScrollBar` 类的可访问性支持。

从类 javax.swing.JComponent 继承的嵌套类/接口
`JComponent.AccessibleJComponent`

从类 java.awt.Container 继承的嵌套类/接口
`Container.AccessibleAWTContainer`

从类 java.awt.Component 继承的嵌套类/接口
`Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy`

字段摘要
`protected int`	`blockIncrement`
`protected BoundedRangeModel`	`model` 表示滚动条的最小、最大、跨度（也叫 "visibleAmount"）和当前值的模型。
`protected int`	`orientation`
`protected int`	`unitIncrement`

从类 javax.swing.JComponent 继承的字段
`accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

从类 java.awt.Component 继承的字段
`BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

从接口 java.awt.Adjustable 继承的字段
`HORIZONTAL, NO_ORIENTATION, VERTICAL`

从接口 java.awt.image.ImageObserver 继承的字段
`ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

构造方法摘要
`JScrollBar()` 创建具有下列初始值的垂直滚动条：
`JScrollBar(int orientation)` 创建具有指定方向和下列初始值的滚动条：
`JScrollBar(int orientation, int value, int extent, int min, int max)` 创建具有指定方向、值、跨度、最小值和最大值的一个滚动条。

方法摘要
`void`	`addAdjustmentListener(AdjustmentListener l)` 添加一个 AdjustmentListener。
`protected void`	`fireAdjustmentValueChanged(int id, int type, int value)` 通知侦听器该滚动条的模型已更改。
`AccessibleContext`	`getAccessibleContext()` 获取与此 JScrollBar 相关联的 AccessibleContext。
`AdjustmentListener[]`	`getAdjustmentListeners()` 返回使用 addAdjustmentListener() 添加到此 JScrollBar 中的 `AdjustmentListener` 组成的数组。
`int`	`getBlockIncrement()` 供与 java.awt.Scrollbar 向后兼容。
`int`	`getBlockIncrement(int direction)` 针对一个向上/向下滚动一个块（通常为 "page"）的请求，返回滚动条值的更改量。
`int`	`getMaximum()` 滚动条的最大值为最大跨度。
`Dimension`	`getMaximumSize()` 滚动条沿其滚动轴具有弹性，沿另一个轴具有刚性。
`int`	`getMinimum()` 返回滚动条支持的最小值（通常为 0）。
`Dimension`	`getMinimumSize()` 滚动条沿其滚动轴具有弹性，沿另一个轴具有刚性。
`BoundedRangeModel`	`getModel()` 返回处理滚动条的四个基本属性的数据模型：minimum、maximum、value 和 extent。
`int`	`getOrientation()` 返回组件的方向（横向或纵向）。
`ScrollBarUI`	`getUI()` 返回实现此组件的外观的委托。
`String`	`getUIClassID()` 返回此组件的 LookAndFeel 类的名称。
`int`	`getUnitIncrement()` 供与 java.awt.Scrollbar 向后兼容。
`int`	`getUnitIncrement(int direction)` 针对一个向上/向下滚动一个单位的请求，返回滚动条值的更改量。
`int`	`getValue()` 返回滚动条的值。
`boolean`	`getValueIsAdjusting()` 如果滚动条滑块被拖动，则返回 True。
`int`	`getVisibleAmount()` 返回滚动条的跨度，即它的 "visibleAmount"。
`protected String`	`paramString()` 返回此 JScrollBar 的字符串表示形式。
`void`	`removeAdjustmentListener(AdjustmentListener l)` 移除一个 AdjustmentEvent 侦听器。
`void`	`setBlockIncrement(int blockIncrement)` 设置 blockIncrement 属性。
`void`	`setEnabled(boolean x)` 启用该组件以便滑块位置能够改变。
`void`	`setMaximum(int maximum)` 设置模型的 maximum 属性。
`void`	`setMinimum(int minimum)` 设置模型的 minimum 属性。
`void`	`setModel(BoundedRangeModel newModel)` 设置处理滚动条的以下四个基本属性的模型：minimum、maximum、value 和 extent。
`void`	`setOrientation(int orientation)` 将滚动条的方向设置为 VERTICAL 或 HORIZONTAL。
`void`	`setUI(ScrollBarUI ui)` 设置呈现此组件的 L&F 对象。
`void`	`setUnitIncrement(int unitIncrement)` 设置 unitIncrement 属性。
`void`	`setValue(int value)` 设置滚动条的值。
`void`	`setValueIsAdjusting(boolean b)` 设置模型的 valueIsAdjusting 属性。
`void`	`setValues(int newValue, int newExtent, int newMin, int newMax)` 强制参数满足以下常规约束后设置四个 BoundedRangeModel 属性：
`void`	`setVisibleAmount(int extent)` 设置模型的 extent 属性。
`void`	`updateUI()` 重写 `JComponent.updateUI`。

从类 javax.swing.JComponent 继承的方法
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

从类 java.awt.Container 继承的方法
add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

从类 java.awt.Component 继承的方法
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle