布局管理器和定位
mKo*_*bel 6 java swing layout-manager glasspane componentlistener
如何在不使用ComponentListener或其他监听器的情况下将GlassPaane中的JLabel粘贴到JProgressBar的相对浮动坐标,
是否有标准布局管理器中的built_in通知程序可以通知其内部状态,并且可以访问覆盖,而不是我尝试使用ComponentListener和NullLayout
.
SSCCE关于ComponentListener和与NullLayout
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.JRadioButton;
import javax.swing.UIManager;
//http://stackoverflow.com/questions/14560680/jprogressbar-low-values-will-not-be-displayed
public class ProgressSample {
private JFrame frame = new JFrame("GlassPane instead of JLayer");
private JLabel label;
private GridBagConstraints gbc = new GridBagConstraints();
private JProgressBar progressSeven;
public ProgressSample() {
frame.setLayout(new FlowLayout());
frame.add(new JButton("test"));
frame.add(new JCheckBox("test"));
frame.add(new JRadioButton("test"));
// Nothing is displayed if value is lover that 6
JProgressBar progressSix = new JProgressBar(0, 100);
progressSix.setValue(2);
frame.add(progressSix);
// but this works value is higher that 6
progressSeven = new JProgressBar(0, 100);
progressSeven.addComponentListener(new ComponentAdapter() {
@Override
public void componentMoved(ComponentEvent e) {
label.setBounds(
(int) progressSeven.getBounds().getX(),
(int) progressSeven.getBounds().getY(),
progressSeven.getPreferredSize().width,
label.getPreferredSize().height);
}
});
progressSeven.setValue(7);
frame.add(progressSeven);
label = new JLabel();
label.setText("<html>Blablabla, Blablablabla<br>"
+ "Blablabla, Blablablabla<br>"
+ "Blablabla, Blablablabla</html>");
label.setPreferredSize(new Dimension(
progressSeven.getPreferredSize().width,
label.getPreferredSize().height));
Container glassPane = (Container) frame.getRootPane().getGlassPane();
glassPane.setVisible(true);
glassPane.setLayout(null);
glassPane.add(label, gbc);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
ProgressSample dialogTest = new ProgressSample();
}
}
如何将GlassPane中的JLabel粘贴到JProgressBar的相对浮动坐标,而不使用ComponentListener或其他侦听器
我的想法是将两个组件包装在一个容器中,OverlayLayout并使用AlignementX/AlignementY"play"作为相对坐标.然后将包装容器放在原始层次结构中.(见下面我的SSCCE)
是否有标准布局管理器中的built_in通知程序可以通知其内部状态,并且可以访问覆盖,而不是我尝试使用ComponentListener和NullLayout
LayoutManagerAPI中没有此类合同,因此您无法安全地依赖任何此类机制.此外,您将面临标准LayoutManager的问题,因为它们会JLabel在布局中考虑您的额外因素.
想象一下,你使用的是FlowLayout1个组件,然后是额外JLabel组件,然后是另一个组件.当您移动额外JLabel的组件时,最后一个组件将保持与第一个组件"远离",您将看到这两个组件之间存在差距.
如果最后一个问题不是问题,你可以简单地扩展FlowLayout(或任何其他LayoutManager),覆盖layoutContainer并将额外的JLabel地方放在你想要的任何地方.
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JRadioButton;
import javax.swing.OverlayLayout;
import javax.swing.UIManager;
//http://stackoverflow.com/questions/14560680/jprogressbar-low-values-will-not-be-displayed
public class ProgressSample {
private JFrame frame = new JFrame("GlassPane instead of JLayer");
private JLabel label;
private GridBagConstraints gbc = new GridBagConstraints();
private JProgressBar progressSeven;
public ProgressSample() {
frame.setLayout(new FlowLayout());
frame.add(new JButton("test"));
frame.add(new JCheckBox("test"));
frame.add(new JRadioButton("test"));
// Nothing is displayed if value is lover that 6
JProgressBar progressSix = new JProgressBar(0, 100);
progressSix.setValue(2);
frame.add(progressSix);
JPanel wrappingPanel = new JPanel();
OverlayLayout mgr = new OverlayLayout(wrappingPanel);
wrappingPanel.setLayout(mgr);
progressSeven = new JProgressBar(0, 100);
progressSeven.setAlignmentX(0.0f);
progressSeven.setAlignmentY(0.0f);
frame.add(wrappingPanel);
label = new JLabel();
label.setText("<html>Blablabla, Blablablabla<br>" + "Blablabla, Blablablabla<br>" + "Blablabla, Blablablabla</html>");
label.setAlignmentX(0.0f);
label.setAlignmentY(0.0f);
wrappingPanel.add(label);
wrappingPanel.add(progressSeven);
Container glassPane = (Container) frame.getRootPane().getGlassPane();
glassPane.setVisible(true);
glassPane.setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
ProgressSample dialogTest = new ProgressSample();
}
}
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