[英]Custom Font for JComboBox
I would like that to know how to change the Font for the displayed/selected value in a JComboBox
. 我想知道如何更改JComboBox
显示/选定值的字体。 EG 例如
The upper rendering of Aharoni
(image courtesy of this answer ). Aharoni
的上部渲染(图片由此答案提供 )。
I can change the list values with a renderer like this: 我可以使用这样的渲染器更改列表值:
public class JComboBoxItalic extends BasicComboBoxRenderer {
protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer();
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
Font theFont = null;
JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected,cellHasFocus);
theFont = new Font("Courier", Font.ITALIC, 14);
renderer.setFont(theFont);
return renderer;
}
}
But this does not affect the selected value when the box is closed . 但是, 当关闭该框时,这不会影响所选值。 Any ideas? 有任何想法吗?
I can't see something wrong, issue must be in the rest of your code 我看不出有什么问题,问题必须在你的其余代码中
Renderer is applied only for Item in (if is visible) popup window, 渲染器仅适用于Item in(如果可见)弹出窗口,
you can to use the basic and simplest Renderer 你可以使用基本和最简单的渲染器
you can to override all from paramaters from púaramaters - JList list, Object value, int index, boolean isSelected, boolean cellHasFocus, every are settable, testable ..., separatelly 你可以覆盖来自púaramaters的所有参数 - JList列表,Object值,int index,boolean isSelected,boolean cellHasFocus,每个都是可设置的,可测试的......,单独的
. 。
private class ComboBoxRenderer extends DefaultListCellRenderer {
private static final long serialVersionUID = 1L;
private Font baseFont = new JLabel("Test").getFont();
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
//if (value instanceof Font) {
// Font font = (Font) value;
// setFont(new Font(font.getName(), baseFont.getStyle(), baseFont.getSize()));
setFont(new Font("Courier", Font.ITALIC, 14));
//}
return this;
}
}
EDIT 编辑
I would like that to know how to change the Font for the displayed/selected value in a JComboBox 我想知道如何更改JComboBox中显示/选定值的字体
. 。
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import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.plaf.basic.BasicComboBoxRenderer;
public class SystemFontDisplayer extends JFrame {
private static final long serialVersionUID = 1L;
private JComboBox fontsBox;
public SystemFontDisplayer() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
String[] fontFamilyNames = ge.getAvailableFontFamilyNames();
fontsBox = new JComboBox(fontFamilyNames);
fontsBox.setSelectedItem(0);
fontsBox.setRenderer(new ComboRenderer(fontsBox));
fontsBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
final String fontName = fontsBox.getSelectedItem().toString();
fontsBox.setFont(new Font(fontName, Font.PLAIN, 16));
}
}
});
fontsBox.setSelectedItem(0);
fontsBox.getEditor().selectAll();
add(fontsBox, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setPreferredSize(new Dimension(400, 60));
setLocation(200, 105);
pack();
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
fontsBox.setPopupVisible(true);
fontsBox.setPopupVisible(false);
}
});
setVisible(true);
}
public static void main(String arg[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
SystemFontDisplayer systemFontDisplayer = new SystemFontDisplayer();
}
});
}
private class ComboRenderer extends BasicComboBoxRenderer {
private static final long serialVersionUID = 1L;
private JComboBox comboBox;
final DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer();
private int row;
private ComboRenderer(JComboBox fontsBox) {
comboBox = fontsBox;
}
private void manItemInCombo() {
if (comboBox.getItemCount() > 0) {
final Object comp = comboBox.getUI().getAccessibleChild(comboBox, 0);
if ((comp instanceof JPopupMenu)) {
final JList list = new JList(comboBox.getModel());
final JPopupMenu popup = (JPopupMenu) comp;
final JScrollPane scrollPane = (JScrollPane) popup.getComponent(0);
final JViewport viewport = scrollPane.getViewport();
final Rectangle rect = popup.getVisibleRect();
final Point pt = viewport.getViewPosition();
row = list.locationToIndex(pt);
}
}
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (list.getModel().getSize() > 0) {
manItemInCombo();
}
final JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, row, isSelected, cellHasFocus);
final Object fntObj = value;
final String fontFamilyName = (String) fntObj;
setFont(new Font(fontFamilyName, Font.PLAIN, 16));
return this;
}
}
}
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