[英]Add space between label and jButton on a tabbed pane header
如上圖所示,我有一個選項卡式窗格。 在選項卡標題上,我有一個JLabel
(制表符測試)和一個JButton
(X)。 它們彼此並排放置,但我希望它們之間留一點間隙以使其看起來自然。
我嘗試過使用Box
但是它具有相同的背景文字,因此看起來也不自然。 Box
沒有setBorders
方法。
這是Box
樣子:
這是我的代碼:
System.out.println("NewTableEvent!!!!");
final String tittle = table.getTabName();
JButton jButtonClose = new JButton("X");
jButtonClose.setBorderPainted(false);
jButtonClose.setBorder(null);
JPanel tabComponent = new JPanel(new BorderLayout());
tabComponent.add(new JLabel(tittle), BorderLayout.WEST);
tabComponent.setToolTipText("Close this tab.");
Component box = Box.createRigidArea(new Dimension(25,0));
tabComponent.add(box, BorderLayout.CENTER);
tabComponent.add(jButtonClose, BorderLayout.EAST);
// rightTabbedPane.addTab(null, table.getTable());
rightTabbedPane.addTab(null, new JPanel());
// Get total tabs
final int totalTabs = rightTabbedPane.getComponentCount();
System.out.println("Total tabs: " + totalTabs);
// Set the custom tab component
rightTabbedPane.setTabComponentAt(0, tabComponent);
那么,如何才能為JLabel
和JButton
騰出空間並保持背景與該距離無關?
我無法對其進行測試,但是我相信您只需要在將其添加到tabComponent之前告訴它不透明即可:
box.setOpaque(false);
希望這對您有用。
編輯
您可能可以在標簽和按鈕周圍設置邊框來完成此操作:
JLabel label = new JLabel(tittle);
tabComponent.add(label);
//add more space between the label and the button
label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
tabComponent.add(jButtonClose);
演示位於: http : //docs.oracle.com/javase/tutorial/uiswing/components/tabbedpane.html
感謝@Gavin Markee,我提出了以下解決方案:
首先,創建這個新類(與Gavin MArkee的鏈接示例中給出的類完全相同,我只是在此處發布它,以防將來被刪除):
public class ButtonTabComponent extends JPanel {
private final JTabbedPane pane;
public ButtonTabComponent(final JTabbedPane pane) {
// Unset default FlowLayout' gaps
super(new FlowLayout(FlowLayout.LEFT, 0, 0));
if (pane == null) {
throw new NullPointerException("TabbedPane is null");
}
this.pane = pane;
setOpaque(false);
//make JLabel read titles from JTabbedPane
JLabel label = new JLabel() {
@Override
public String getText() {
int i = pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
return pane.getTitleAt(i);
}
return null;
}
};
add(label);
//add more space between the label and the button
label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
//tab button
JButton button = new TabButton();
add(button);
//add more space to the top of the component
setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
}
private class TabButton extends JButton implements ActionListener {
public TabButton() {
int size = 17;
setPreferredSize(new Dimension(size, size));
setToolTipText("close this tab");
//Make the button looks the same for all Laf's
setUI(new BasicButtonUI());
//Make it transparent
setContentAreaFilled(false);
//No need to be focusable
setFocusable(false);
setBorder(BorderFactory.createEtchedBorder());
setBorderPainted(false);
//Making nice rollover effect
//we use the same listener for all buttons
addMouseListener(buttonMouseListener);
setRolloverEnabled(true);
//Close the proper tab by clicking the button
addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
int i = pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
pane.remove(i);
}
}
//we don't want to update UI for this button
@Override
public void updateUI() {
}
//paint the cross
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
//shift the image for pressed buttons
if (getModel().isPressed()) {
g2.translate(1, 1);
}
g2.setStroke(new BasicStroke(2));
g2.setColor(Color.BLACK);
if (getModel().isRollover()) {
g2.setColor(Color.MAGENTA);
}
int delta = 6;
g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
g2.dispose();
}
}
private final static MouseListener buttonMouseListener = new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
Component component = e.getComponent();
if (component instanceof AbstractButton) {
AbstractButton button = (AbstractButton) component;
button.setBorderPainted(true);
}
}
@Override
public void mouseExited(MouseEvent e) {
Component component = e.getComponent();
if (component instanceof AbstractButton) {
AbstractButton button = (AbstractButton) component;
button.setBorderPainted(false);
}
}
};
}
然后,在創建Tabe時,您只需:
tabbedPane.addTab(myTabTitle, myTable);
tabbedPane.setTabComponentAt(tabIndex, new ButtonTabComponent(tabbedPane));
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