listcellrenderer | 易学教程

How to change appearance of JComboBox's display area

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问题 I'm using a custom BasicComboBoxRenderer for a JComboBox and I've changed the appearance of the items of the drop-down list. However these changes also apply to the single top item that shows in the combobox (don't know how to call it). I want the top item to be independent of the other items in the list, if possible. I would also like to get rid of the top item's blue color when it is focused (setFocusable(false) is not what I want). I've tried to use the "renderer index" (-1) to affect the

Custom ListCellRenderer will not change background color

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问题 I have this class: @SuppressWarnings("serial") private class DataCellRenderer extends JLabel implements ListCellRenderer { public DataCellRenderer() { setHorizontalAlignment(SwingConstants.RIGHT); } @Override public Component getListCellRendererComponent( JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { if(isSelected) setBackground(Color.red); setText(" " + value.toString()); return this; } } The problem is that my Background will not turn red when I select a

Displaying an ImageIcon in a JList that uses a different Object to load the JList data

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问题 I have a JList that is being populated through an ArrayList of strings somewhere else, i want to for the same list now display an ImageIcon saved in my directory somewhere. For now i want to display the same icon for any item added to the list (or any items currently in the list). My list should look like this : ICON STUDENT NAME ... ICON STUDENT NAME The problem (The image icon shows the correct height and it is being captured but does not show in the list at run-time Here is my action

Alignment resets when using setEditable() for a JComboBox

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问题 class RuleComboBox extends JComboBox { public RuleComboBox() { super(); this.setModel(new javax.swing.DefaultComboBoxModel(new String[]{"abc", "defg"})); ((JLabel) this.getRenderer()).setHorizontalAlignment(SwingConstants.CENTER); } } The getRenderer() line aligns the text to centre. When I use ruleComboBox1.setEnabled(false) and ruleComboBox1.setEditable(true) , the text aligns back to the left which I don't want. How can I stop this? I should explain that I'm using setEditable(true) to keep

How many times is getListCellRendererComponent called?

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问题 I'm trying to understand how getListCellRendererComponent method works but I don't get it. I made a separate class that extends BasicComboBoxRenderer and I added a counter which is printed every time getListCellRendererComponent is called. I then run a test class with a main method that shows a frame with just a JComboBox that uses my custom renderer class. This combobox has 3 items in total and I've set setMaximumRowCount(2) so it only shows 2 of them. When I first run the program and the

Is it possible to have a different font colors on one JLabel inside in the JList?

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问题 I have a list of words in my Jlist and beside of every words are their definitions. I want that the font of the words are having a different colors than their definition. My question is that, Is it possible to have a two different colors in one Jlist? Do I have to use ListCellRenderer? Thanks... 回答1: I think you may use "<html>" style. It might look some odd but if you start your text (String value) by "<html>" (not capital letter HTML), you will be able to use html codes on your labels. As

Is it possible to have a different font colors on one JLabel inside in the JList?

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Using the ComboBoxEditor interface with Custom JComponent, and allow edit, and display the List

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问题 I was checking the documentation. https://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html https://alvinalexander.com/java/jwarehouse/openjdk-8/jdk/src/share/classes/javax/swing/plaf/basic/BasicComboBoxEditor.java.shtml http://www.java2s.com/Tutorials/Java/javax.swing/ComboBoxEditor/Java_ComboBoxEditor_getEditorComponent_.htm ... and I'm trying to use my Custom ComboBox implementing the interface ComboBoxEditor . Here my complete Code... I hava one JPanel with JComponents ...

How to prevent JComboBox from becoming unresponsive when using a custom ListCellRenderer

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问题 I am making a font chooser using JComboBox and a custom ListCellRenderer . I want the JComboBox to display all available fonts, with each font name displayed in its own font. I am currently using around 500 fonts. An example of a ListCellRenerer that provides this functionality: private class ComboBoxRenderer extends JLabel implements ListCellRenderer { private JLabel label = new JLabel("Test"); @Override public Component getListCellRendererComponent(JList list, Object value, int index,

Custom Java ListCellRenderer - Can't click JCheckBox

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问题 Made a custom ListCellRenderer: import java.awt.Component; import javax.swing.JCheckBox; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.ListCellRenderer; /** * * @author Spencer */ public class TaskRenderer implements ListCellRenderer { private Task task; private JPanel panel = new JPanel(); private JCheckBox checkbox = new JCheckBox(); private JLabel label = new JLabel(); public TaskRenderer() { panel.add(checkbox); panel.add(label); }