JList中的组件被White Square Thing隐藏直到被单击 [英] Components in JList are Hidden by White Square Thing Until Clicked
问题描述
在我正在从事的项目中，我注意到JScrollPane中的所有JList项都被隐藏，直到单击JScrollPane/JList为止.奇怪的是它没有被完全覆盖.有一个带有透明边框的白色框，该边框散布在整个对象上，在所有边缘上覆盖了除少数像素以外的所有像素.
In a project I've been working on, I noticed that all the JList items in my JScrollPane are hidden until the JScrollPane/JList has been clicked. The weird part is it's not completely covered. There's this white box with a transparent border that spreads out over the whole thing, covering all but a few pixels on all edges.
图片:
如您所见，中间有一个白色块-注意粉红色的边框":
As you can see, there is this white block in the middle - notice the pink "border":
现在，一旦我单击该白框，它就会消失:
Now, once I click that white box, it goes away:
我知道洋红色看起来很可怕，但是我将其用于对比.
I know the magenta looks horrible, but I'm using it for contrast.
哪个使我想到了一个问题:我该如何摆脱那个令人讨厌的白盒子?
Which leads me to my question: how do I get rid of that obnoxious white box?
这是我的代码:
public static void listJars(File f)
{
JCheckBox firstBox = null;
DefaultListModel<JCheckBox> model = new DefaultListModel<>();
if(mainGUI.checkList != null)
{
//System.out.println("Already exists lol: " + mainGUI.checkList.getName());
mainGUI.pluginList.remove(mainGUI.checkList);
}
//mainGUI.pluginList.repaint();
File[] files = new File(f.getPath()).listFiles();
if (files != null)
{
for (File file : files)
{
if (file.getName().endsWith(".jar") || file.getName().endsWith("._jar"))
{
JCheckBox cb = new JCheckBox(file.getName());
if(firstBox == null)
{
firstBox = cb;
}
cb.setSelected(file.getName().endsWith(".jar"));
cb.setVisible(true);
cb.setText(file.getName());
model.addElement(cb);
cb.repaint();
}
}
}
JCheckBoxList jCheckBoxList = new JCheckBoxList(model, mainGUI.textField1.getText());
jCheckBoxList.setName("pluginCheckboxList");
jCheckBoxList.setSize(mainGUI.pluginList.getSize());
mainGUI.pluginList.add(jCheckBoxList);
mainGUI.checkList = jCheckBoxList;
jCheckBoxList.setVisible(true);
jCheckBoxList.setVisibleRowCount(10);
}
还有十个是我的JCheckBoxList类.
And ten there's my JCheckBoxList class.
package Components;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
@SuppressWarnings("serial")
public class JCheckBoxList extends JList<JCheckBox>
{
protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
protected String lastPath;
public JCheckBoxList(final String lastPath)
{
this.lastPath = lastPath;
setCellRenderer(new CellRenderer());
setBackground(Color.magenta);
addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
int index = locationToIndex(e.getPoint());
if (index != -1)
{
JCheckBox checkBox = getModel().getElementAt(index);
checkBox.setSelected(!checkBox.isSelected());
repaint();
final String oldname = checkBox.getText();
if (!checkBox.isSelected())
{
checkBox.setName(checkBox.getText().substring(0, checkBox.getText().length() - 4) + "._jar");
}
else
{
checkBox.setName(checkBox.getText().substring(0, checkBox.getText().length() - 5) + ".jar");
}
System.out.println("Changed! Sel: " + checkBox.isSelected() + ", Name: " + checkBox.getName());
checkBox.setText(checkBox.getName());
String base = new File(lastPath).getParent() + "/plugins/";
boolean rename = new File(base + oldname).renameTo(new File(base + checkBox.getText()));
}
}
});
setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
}
public JCheckBoxList(ListModel<JCheckBox> model, String lastPath)
{
this(lastPath);
setModel(model);
}
protected class CellRenderer implements ListCellRenderer<JCheckBox>
{
public Component getListCellRendererComponent(
JList<? extends JCheckBox> list, JCheckBox value, int index,
boolean isSelected, boolean cellHasFocus)
{
//Drawing checkbox, change the appearance here
value.setBackground(isSelected ? getSelectionBackground()
: getBackground());
value.setForeground(isSelected ? getSelectionForeground()
: getForeground());
value.setEnabled(isEnabled());
value.setFont(getFont());
value.setFocusPainted(false);
value.setBorderPainted(true);
value.setBorder(BorderFactory.createEmptyBorder(0, 10, 5, 0));
return value;
}
}
}
然后是我的滚动窗格，其中具有以下设置(使用Intelliji IDEA UI设计器):
And then there's my scroll pane, which has these settings (using the Intelliji IDEA UI designer):
有什么想法吗?
推荐答案
mainGUI.pluginList.add(jCheckBoxList);
mainGUI.checkList = jCheckBoxList;
jCheckBoxList.setVisible(true);
jCheckBoxList.setVisibleRowCount(10);
在我看来，就像您正在将组件动态添加到可见的GUI中一样.
Looks to me like you are dynamically adding components to a visible GUI.
执行此操作时，基本代码为:
When you do this the basic code is:
panel.add(...);
panel.revalidate();
panel.repaint();
在执行上述代码之前，您应该设置visibleRowCount().
You should set the visibleRowCount() before the above code is executed.
也:
- 默认情况下，Swing组件是可见的，因此您不需要
setVisible(true). - 您可能要考虑使用单列JTable，因为它已经支持复选框渲染器和编辑器.
我上面给您的解决方案是常规解决方案.滚动窗格是不同的，您只应将一个组件添加到视口中.
The solution I gave you above is the general solution. A scroll pane is different, you should only ever add a component to the viewport.
基于不正确的解决方案，您应该使用:
Based on your incorrect solution you should be using:
//mainGUI.pluginList.add(jCheckBoxList);
mainGUI.pluginList.setViewportView(jCheckBoxList);
仅发布几行随机代码的问题是我们不知道代码的完整上下文.我没有意识到"pluginList"实际上是一个滚动窗格.通常，变量名称的名称中会包含滚动或滚动窗格.
The problem with posting only a few random lines of code is that we don't know the full context of the code. I did not realize "pluginList" was actually a scrollpane. Usually the variable name will have scroll or scrollpane in the name.
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