难得一见的java Swing 源代码示例，非常好

/* (swing1.1.1beta2) */ package jp.gr.java_conf.tame.swing.panel; import javax.swing.*; import java.awt.*; import java.awt.event.*; import javax.swing.plaf.basic.BasicTabbedPaneUI; import javax.swing.plaf.metal.MetalTabbedPaneUI; /** * @version 1.0 07/09/99 */ public class SingleRowTabbedPaneUI extends MetalTabbedPaneUI { protected ActionListener[] buttonListeners; public void installUI(JComponent c) { this.tabPane = (JTabbedPane)c; c.setLayout(createLayoutManager()); installDefaults(); installComponents(); installListeners(); installKeyboardActions(); runCount = 1; selectedRun = 0; } public void uninstallUI(JComponent c) { uninstallComponents(); super.uninstallUI(c); } protected LayoutManager createLayoutManager() { return new SingleRowTabbedLayout(tabPane); } protected void installComponents() { JButton[] buttons = ((SingleRowTabbedPane)tabPane).getButtons(); for (int i=0;i<buttons.length;i++) { tabPane.add(buttons[i]); } } protected void uninstallComponents() { JButton[] buttons = ((SingleRowTabbedPane)tabPane).getButtons(); for (int i=0;i<buttons.length;i++) { tabPane.remove(buttons[i]); } } protected void installListeners() { super.installListeners(); SingleRowTabbedPane stabPane = (SingleRowTabbedPane)tabPane; JButton[] buttons = stabPane.getButtons(); int n = buttons.length; buttonListeners = new ActionListener[n]; for (int i=0;i<n;i++) { buttonListeners[i] = null; String str = buttons[i].getActionCommand(); if (str.equals(SingleRowTabbedPane.ROTATE)) { buttonListeners[i] = new ShiftTabs() { protected int getStartIndex() { int index = sPane.getVisibleStartIndex() + sPane.getVisibleCount(); return (index < sPane.getTabCount())? index: 0; } }; } else if (str.equals(SingleRowTabbedPane.PREVIOUS)) { buttonListeners[i] = new ShiftTabs() { protected int getStartIndex() { return getStartIndex(sPane.getVisibleStartIndex() - 1); } }; } else if (str.equals(SingleRowTabbedPane.NEXT)) { buttonListeners[i] = new ShiftTabs() { protected int getStartIndex() { return sPane.getVisibleStartIndex() + sPane.getVisibleCount(); } }; } else if (str.equals(SingleRowTabbedPane.FIRST)) { buttonListeners[i] = new ShiftTabs(); } else if (str.equals(SingleRowTabbedPane.LEFT_SHIFT)) { buttonListeners[i] = new ShiftTabs() { protected int getStartIndex() { return sPane.getVisibleStartIndex() - 1; } }; } else if (str.equals(SingleRowTabbedPane.RIGHT_SHIFT)) { buttonListeners[i] = new ShiftTabs() { protected int getStartIndex() { return sPane.getVisibleStartIndex() + 1; } }; } else if (str.equals(SingleRowTabbedPane.LAST)) { buttonListeners[i] = new ShiftTabs() { protected int getStartIndex() { return getStartIndex(sPane.getTabCount() - 1); } }; } buttons[i].addActionListener(buttonListeners[i]); } } protected void uninstallListeners() { super.uninstallListeners(); JButton[] buttons = ((SingleRowTabbedPane)tabPane).getButtons(); for (int i=0;i<buttons.length;i++) { buttons[i].removeActionListener(buttonListeners[i]); } } public int tabForCoordinate(JTabbedPane pane, int x, int y) { int tabCount = tabPane.getTabCount(); SingleRowTabbedPane stabPane = (SingleRowTabbedPane)tabPane; int visibleCount = stabPane.getVisibleCount(); int visibleStartIndex = stabPane.getVisibleStartIndex(); for (int i=0,index = visibleStartIndex; i < visibleCount; i++,index++) { if (rects[index].contains(x, y)) { return index; } } return -1; } public void paint(Graphics g, JComponent c) { int selectedIndex = tabPane.getSelectedIndex(); int tabPlacement = tabPane.getTabPlacement(); int tabCount = tabPane.getTabCount(); ensureCurrentLayout(); SingleRowTabbedPane stabPane = (SingleRowTabbedPane)tabPane; int visibleCount = stabPane.getVisibleCount(); int visibleStartIndex = stabPane.getVisibleStartIndex(); Rectangle iconRect = new Rectangle(), textRect = new Rectangle(); Rectangle clipRect = g.getClipBounds(); Insets insets = tabPane.getInsets(); tabRuns[0] = visibleStartIndex; for (int i=0,index=visibleStartIndex; i<visibleCount; i++,index++) { if (rects[index].intersects(clipRect)) { paintTab(g, tabPlacement, rects, index, iconRect, textRect); } } if (stabPane.isVisibleTab(selectedIndex)) { if (rects[selectedIndex].intersects(clipRect)) { paintTab(g, tabPlacement, rects, selectedIndex, iconRect, textRect); } } paintContentBorder(g, tabPlacement, selectedIndex); } protected void paintContentBorderTopEdge( Graphics g, int tabPlacement, int selectedIndex, int x, int y, int w, int h ) { g.setColor(selectHighlight); if (tabPlacement != TOP || selectedIndex < 0 || (rects[selectedIndex].y + rects[selectedIndex].height + 1 < y) || !((SingleRowTabbedPane)tabPane).isVisibleTab(selectedIndex) ) { g.drawLine(x, y, x+w-2, y); } else { Rectangle selRect = rects[selectedIndex]; g.drawLine(x, y, selRect.x + 1, y); if (selRect.x + selRect.width < x + w - 2) { g.drawLine(selRect.x + selRect.width, y, x+w-2, y); } else { g.setColor(shadow); g.drawLine(x+w-2, y, x+w-2, y); } } } protected void paintContentBorderBottomEdge(Graphics g, int tabPlacement, int selectedIndex, int x, int y, int w, int h) { g.setColor(darkShadow); if (tabPlacement != BOTTOM || selectedIndex < 0 || (rects[selectedIndex].y - 1 > h) || !((SingleRowTabbedPane)tabPane).isVisibleTab(selectedIndex) ) { g.drawLine(x, y+h-1, x+w-1, y+h-1); } else { Rectangle selRect = rects[selectedIndex]; g.drawLine(x, y+h-1, selRect.x, y+h-1); if (selRect.x + selRect.width < x + w - 2) { g.drawLine(selRect.x + selRect.width, y+h-1, x+w-1, y+h-1); } } } protected Insets getTabAreaInsets(int tabPlacement) { SingleRowTabbedPane stabPane = (SingleRowTabbedPane)tabPane; Dimension d = stabPane.getButtonPreferredSize(); int n = stabPane.getButtonCount(); int buttonPlacement = stabPane.getButtonPlacement(); Insets currentInsets = new Insets(0,0,0,0); if (tabPlacement == TOP) { currentInsets.top = tabAreaInsets.top; currentInsets.bottom = tabAreaInsets.bottom; } else { currentInsets.top = tabAreaInsets.bottom; currentInsets.bottom = tabAreaInsets.top; } if (buttonPlacement == RIGHT) { currentInsets.left = tabAreaInsets.left; currentInsets.right = tabAreaInsets.right + n * d.width; } else { currentInsets.left = tabAreaInsets.left + n * d.width; currentInsets.right = tabAreaInsets.right; } return currentInsets; } protected int lastTabInRun(int tabCount, int run) { SingleRowTabbedPane stabPane = (SingleRowTabbedPane)tabPane; return stabPane.getVisibleStartIndex() + stabPane.getVisibleCount() -1; } protected void ensureCurrentLayout() { SingleRowTabbedLayout layout = (SingleRowTabbedLayout)tabPane.getLayout(); layout.calculateLayoutInfo(); setButtonsEnabled(); } protected void setButtonsEnabled() { SingleRowTabbedPane stabPane = (SingleRowTabbedPane)tabPane; int visibleCount = stabPane