JTabbedPane:选项卡位置设置为LEFT但图标未对齐
use*_*318 0 java icons swing alignment jtabbedpane
我有一个JTabbedPane标签位置设置为LEFT.问题是每个标签中的图标不是彼此垂直对齐的.
考虑这张图:
正如你所看到的"Editar Protocolo"(第二个选项卡)的图标不完全符合"Distribuir Protocolo"(第一个选项卡)的图标排列,这也与其他标签发生.我希望所有图标都垂直对齐到左边.
这是我用来设置标签组件的代码:
...
jtabbedPane.setTabComponentAt(1, configurarJtabbedPane("Editar Protocolo", iconEditarProtocolo));
...
public JLabel configurarJtabbedPane(String title, ImageIcon icon) {
JLabel l = new JLabel(title);
l.setIcon(icon);
l.setIconTextGap(5);
l.setHorizontalTextPosition(SwingConstants.RIGHT);
return l;
}
代码从标签左侧的 Q&A:JTabbedPane:图标中提取.
dic*_*c19 11
我想要的是:LEFT中的图标ALL,而不是基于文本大小[...]
选项卡的内容以典型实现为中心,这是有道理的,因为在有效呈现选项卡之前,适合此内容所需的区域是不可预测的.由于该区域取决于内容,并且不同的选项卡可能具有不同的标题长度,因此必须有关于如何呈现这些选项卡的策略.标准是将选项卡内容居中并使选项卡区域适合此内容.当我们有一个默认的选项卡式窗格,顶部有选项卡时,我们不关心图标/文本对齐方式:
唯一的问题可能是标签长度不同,但是谁在乎呢？毕竟,图标和文本是可见的,标签窗格看起来很好.但是,当您将标签放置设置为LEFT或RIGHT时,事物会有所不同,并且看起来没什么吸引力:
显然,这个默认的行为是一个长期存在的问题,并有一个非常有趣的讨论在这里.一些SO成员参与其中:@camickr,@ jackopatra,@ splungebob.正如该文章中所讨论的,一个简单的解决方案是不可能的,并且提出了几种解决方法:基本上是自定义UI实现或使用面板作为渲染器并根据文本长度播放首选宽度/高度.两种选择都涉及很多工作.
为了避免处理UI代理并利用setTabComponentAt(...)方法,我前段时间开始使用标签窗格扩展,我想在这里分享.该方法基于渲染器的Swing概念:一个必须生成组件以呈现另一个组件部分的类,目标是提供一种灵活的机制来添加自定义选项卡组件.
我在下面使用我的自定义选项卡式窗格包含了一个示例,这里概述了提供上述机制所需的所有接口/类.
ITabRenderer界面
第一步是定义一个iterface来提供一个合同来呈现一个标签组件.
AbstractTabRenderer类
一个抽象类,提供基本方法来帮助getTabRendererComponent(...)实现方法.这个抽象类有三个主要属性:
prototypeText:用于定义原型文本以生成默认渲染器组件.prototypeIcon:用于定义原型图标以生成默认渲染器.horizontalTextAlignment:tab的文本水平对齐.
请注意,此类是抽象的,因为它没有实现getTabRendererComponent(...)方法.
DefaultTabRenderer类
扩展AbstractTabRenderer类的具体实现.请注意,如果您想要包含一个关闭按钮,如教程演示中所示,那么此类中的一些工作就足够了.事实上,我已经这样做了,但我不会把这部分包括在内,而不是扩展这个(已经很大的)帖子.
JXTabbedPane
最后是选项卡式窗格的扩展,其中包括选项卡式渲染器支持和覆盖addTab(...)方法.
例
我使用这些PLAF运行了这个带有正面结果的例子:
- WindowsLookAndFeel
- WindowsClassicLookAndFeel
- NimbusLookAndFeel
- MetalLookAndFeel
- SeaglassLookAndFeel
另外,如果将标签放置从LEFT切换到TOP(默认)或BOTTOM,则所有标签仍具有相同的宽度,从而解决了本答案第二段所述的问题.
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public class Demo {
private void createAndShowGUI() {
JXTabbedPane tabbedPane = new JXTabbedPane(JTabbedPane.LEFT);
AbstractTabRenderer renderer = (AbstractTabRenderer)tabbedPane.getTabRenderer();
renderer.setPrototypeText("This text is a prototype");
renderer.setHorizontalTextAlignment(SwingConstants.LEADING);
tabbedPane.addTab("Short", UIManager.getIcon("OptionPane.informationIcon"), createEmptyPanel(), "Information tool tip");
tabbedPane.addTab("Long text", UIManager.getIcon("OptionPane.warningIcon"), createEmptyPanel(), "Warning tool tip");
tabbedPane.addTab("This is a really long text", UIManager.getIcon("OptionPane.errorIcon"), createEmptyPanel(), "Error tool tip");
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(tabbedPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel createEmptyPanel() {
JPanel dummyPanel = new JPanel() {
@Override
public Dimension getPreferredSize() {
return isPreferredSizeSet() ?
super.getPreferredSize() : new Dimension(400, 300);
}
};
return dummyPanel;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Demo().createAndShowGUI();
}
});
}
class JXTabbedPane extends JTabbedPane {
private ITabRenderer tabRenderer = new DefaultTabRenderer();
public JXTabbedPane() {
super();
}
public JXTabbedPane(int tabPlacement) {
super(tabPlacement);
}
public JXTabbedPane(int tabPlacement, int tabLayoutPolicy) {
super(tabPlacement, tabLayoutPolicy);
}
public ITabRenderer getTabRenderer() {
return tabRenderer;
}
public void setTabRenderer(ITabRenderer tabRenderer) {
this.tabRenderer = tabRenderer;
}
@Override
public void addTab(String title, Component component) {
this.addTab(title, null, component, null);
}
@Override
public void addTab(String title, Icon icon, Component component) {
this.addTab(title, icon, component, null);
}
@Override
public void addTab(String title, Icon icon, Component component, String tip) {
super.addTab(title, icon, component, tip);
int tabIndex = getTabCount() - 1;
Component tab = tabRenderer.getTabRendererComponent(this, title, icon, tabIndex);
super.setTabComponentAt(tabIndex, tab);
}
}
interface ITabRenderer {
public Component getTabRendererComponent(JTabbedPane tabbedPane, String text, Icon icon, int tabIndex);
}
abstract class AbstractTabRenderer implements ITabRenderer {
private String prototypeText = "";
private Icon prototypeIcon = UIManager.getIcon("OptionPane.informationIcon");
private int horizontalTextAlignment = SwingConstants.CENTER;
private final PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
public AbstractTabRenderer() {
super();
}
public void setPrototypeText(String text) {
String oldText = this.prototypeText;
this.prototypeText = text;
firePropertyChange("prototypeText", oldText, text);
}
public String getPrototypeText() {
return prototypeText;
}
public Icon getPrototypeIcon() {
return prototypeIcon;
}
public void setPrototypeIcon(Icon icon) {
Icon oldIcon = this.prototypeIcon;
this.prototypeIcon = icon;
firePropertyChange("prototypeIcon", oldIcon, icon);
}
public int getHorizontalTextAlignment() {
return horizontalTextAlignment;
}
public void setHorizontalTextAlignment(int horizontalTextAlignment) {
this.horizontalTextAlignment = horizontalTextAlignment;
}
public PropertyChangeListener[] getPropertyChangeListeners() {
return propertyChangeSupport.getPropertyChangeListeners();
}
public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
return propertyChangeSupport.getPropertyChangeListeners(propertyName);
}
public void addPropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(listener);
}
public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
}
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
PropertyChangeListener[] listeners = getPropertyChangeListeners();
for (int i = listeners.length - 1; i >= 0; i--) {
listeners[i].propertyChange(new PropertyChangeEvent(this, propertyName, oldValue, newValue));
}
}
}
class DefaultTabRenderer extends AbstractTabRenderer implements PropertyChangeListener {
private Component prototypeComponent;
public DefaultTabRenderer() {
super();
prototypeComponent = generateRendererComponent(getPrototypeText(), getPrototypeIcon(), getHorizontalTextAlignment());
addPropertyChangeListener(this);
}
private Component generateRendererComponent(String text, Icon icon, int horizontalTabTextAlignmen) {
JPanel rendererComponent = new JPanel(new GridBagLayout());
rendererComponent.setOpaque(false);
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(2, 4, 2, 4);
c.fill = GridBagConstraints.HORIZONTAL;
rendererComponent.add(new JLabel(icon), c);
c.gridx = 1;
c.weightx = 1;
rendererComponent.add(new JLabel(text, horizontalTabTextAlignmen), c);
return rendererComponent;
}
@Override
public Component getTabRendererComponent(JTabbedPane tabbedPane, String text, Icon icon, int tabIndex) {
Component rendererComponent = generateRendererComponent(text, icon, getHorizontalTextAlignment());
int prototypeWidth = prototypeComponent.getPreferredSize().width;
int prototypeHeight = prototypeComponent.getPreferredSize().height;
rendererComponent.setPreferredSize(new Dimension(prototypeWidth, prototypeHeight));
return rendererComponent;
}
@Override
public void propertyChange(PropertyChangeEvent evt) {
String propertyName = evt.getPropertyName();
if ("prototypeText".equals(propertyName) || "prototypeIcon".equals(propertyName)) {
this.prototypeComponent = generateRendererComponent(getPrototypeText(), getPrototypeIcon(), getHorizontalTextAlignment());
}
}
}
}
截图
MetalLookAndFeel
NimbusLookAndFeel
SeaglassLookAndFeel
WindowsLookAndFeel
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