JScrollPane将垂直大小设置为在最大化窗口时不调整大小
我在JPanel内使用GridBagLayout JScrollPane。 GridBagLayout在某些列（蓝色）之间设置了线条分割边框。问题是我无法使行为正常，同时从JScrollPane中删除不必要的右滚动条。
守则......
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TestGui extends JFrame {
//**************************************************************************************
//************************************** Variables *************************************
//**************************************************************************************
private String[] showHideComboBoxValue = {"Show hiddenLabel", "Hide hiddenLabel"};
private JComboBox showHideComboBox = createShowHideComboBox(showHideComboBoxValue);
private JLabel labelHiddenOrShown = createDefaultLabel("This label is hidden or shown depending on the status of the combo box", 14);
private JPanel topFrame = createTopFrame();
private JScrollPane topFrameScroll = createTopScrollPane();
private JScrollPane centerFrameScroll = createCenterScrollPane();
//**************************************************************************************
//************************************* Constructor ************************************
//**************************************************************************************
private TestGui() {
add(topFrameScroll, BorderLayout.NORTH);
add(centerFrameScroll, BorderLayout.CENTER);
setSize(800,600);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//**************************************************************************************
//*********************************** Support Method ***********************************
//**************************************************************************************
private static GridBagConstraints setGbc(int gridx, int gridy, int gridWidth, int gridHeight, int ipadx, int ipady, String anchorLocation, double weightx, double weighty, Insets insets, boolean fillCell){
GridBagConstraints gbc = new GridBagConstraints();
if (anchorLocation.toUpperCase().equals("NORTHWEST")){
gbc.anchor = GridBagConstraints.NORTHWEST;
} else if (anchorLocation.toUpperCase().equals("NORTH")){
gbc.anchor = GridBagConstraints.NORTH;
} else if (anchorLocation.toUpperCase().equals("NORTHEAST")){
gbc.anchor = GridBagConstraints.NORTHEAST;
} else if (anchorLocation.toUpperCase().equals("WEST")){
gbc.anchor = GridBagConstraints.WEST;
} else if (anchorLocation.toUpperCase().equals("EAST")){
gbc.anchor = GridBagConstraints.EAST;
} else if (anchorLocation.toUpperCase().equals("SOUTHWEST")){
gbc.anchor = GridBagConstraints.SOUTHWEST;
} else if (anchorLocation.toUpperCase().equals("SOUTH")){
gbc.anchor = GridBagConstraints.SOUTH;
} else if (anchorLocation.toUpperCase().equals("SOUTHEAST")){
gbc.anchor = GridBagConstraints.SOUTHEAST;
} else {
gbc.anchor = GridBagConstraints.CENTER;
}
gbc.gridx = gridx; // column
gbc.gridy = gridy; // row
gbc.gridwidth = gridWidth; // number of columns
gbc.gridheight = gridHeight; // number of rows
gbc.ipadx = ipadx; // width of object
gbc.ipady = ipady; // height of object
gbc.weightx = weightx; // shifts columns to side of set anchor
gbc.weighty = weighty; // shifts rows to side of set anchor
gbc.insets = insets; // placement inside cell
if (fillCell){
gbc.fill = GridBagConstraints.BOTH;
}
return gbc;
}
//**************************************************************************************
//*********************************** Object Methods ***********************************
//**************************************************************************************
private JComboBox createShowHideComboBox(String[] comboValues){
JComboBox comboBox = new JComboBox(comboValues);
comboBox.setPrototypeDisplayValue("X" + comboValues[0] + "X");
return comboBox;
}
private void createShowHideComboBoxAction(){
showHideComboBox.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String selection = ((JComboBox) (e.getSource())).getSelectedItem().toString();
if (selection.equals(showHideComboBoxValue[1])){
labelHiddenOrShown.setVisible(false);
} else {
labelHiddenOrShown.setVisible(true);
}
}
}
);
}
private JLabel createDefaultLabel(String text, int textSize){
JLabel lbl = new JLabel(text);
lbl.setFont(new Font(text, Font.BOLD, textSize));
return lbl;
}
//**************************************************************************************
//************************************ Panel Methods ***********************************
//**************************************************************************************
private JPanel createTopFrame() {
JPanel pnl = new JPanel();
Border lineSplitterBoarder = BorderFactory.createMatteBorder(0, 0, 0, 5, Color.BLUE);
JLabel lineSplitterOne = new JLabel();
lineSplitterOne.setBorder(lineSplitterBoarder);
JLabel lineSplitterTwo = new JLabel();
lineSplitterTwo.setBorder(lineSplitterBoarder);
pnl.setLayout(new GridBagLayout());
createShowHideComboBoxAction();
pnl.add(showHideComboBox,setGbc(0,1, 1,1, 0,0,"CENTER", 0, 0, new Insets(10, 10, 10, 0), false));
pnl.add(createDefaultLabel("Label",14), setGbc(1,0,1,1,0,0,"CENTER",0,0,new Insets(10,10,0,10),false));
pnl.add(createDefaultLabel("Label",14), setGbc(1,1,1,1,0,0,"CENTER",0,0,new Insets(0,10,0,10),false));
pnl.add(createDefaultLabel("Label",14), setGbc(1,2,1,1,0,0,"CENTER",0,0,new Insets(0,10,0,10),false));
pnl.add(createDefaultLabel("Label",14), setGbc(1,3,1,1,0,0,"CENTER",0,0,new Insets(0,10,10,10),false));
pnl.add(lineSplitterOne, setGbc(2,0,1,4,0,0,"CENTER",0,0,new Insets(0,0,0,0),true));
pnl.add(createDefaultLabel("Hidden Label Below", 14), setGbc(3,0,8,1,9,9,"CENTER",0,0,new Insets(10,10,0,10),false));
JPanel labelHiddenOrShownPanel = new JPanel();
labelHiddenOrShownPanel.setLayout(new GridLayout(1,1));
labelHiddenOrShownPanel.add(labelHiddenOrShown);
pnl.add(labelHiddenOrShownPanel, setGbc(3,1,1,1,0,0,"WEST",0,0,new Insets(0,5,0,0),false));
pnl.add(lineSplitterTwo, setGbc(11,0,1,4,0,0,"CENTER",0,0,new Insets(0,5,0,0),true));
pnl.add(createDefaultLabel("Label",14), setGbc(12,0,1,1,0,0,"CENTER",0,0,new Insets(10,10,0,0),false));
pnl.add(createDefaultLabel("Label",14), setGbc(12,1,1,1,0,0,"CENTER",0,0,new Insets(0,10,0,0),false));
pnl.add(createDefaultLabel("Label",14), setGbc(12,2,1,1,0,0,"CENTER",0,0,new Insets(0,10,0,0),false));
pnl.add(createDefaultLabel("Label",14), setGbc(12,3,1,1,0,0,"CENTER",0,0,new Insets(0,10,10,0),false));
return pnl;
}
private JScrollPane createTopScrollPane(){
JScrollPane scrollPane = new JScrollPane();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
//scrollPane.setPreferredSize(new Dimension(0, 160));
scrollPane.setBorder(compoundFinal);
scrollPane.getViewport().setView(topFrame);
return scrollPane;
}
private JScrollPane createCenterScrollPane(){
JScrollPane scrollPane = new JScrollPane();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
scrollPane.setBorder(compoundFinal);
return scrollPane;
}
//**************************************************************************************
//************************************ Start Program ***********************************
//**************************************************************************************
public static void main(String[] args) {
new TestGui();
}
}
重现问题的步骤......
第1步：运行程序并观察顶部JScrollPane右侧不必要的滚动条...
第2步：最大化窗口，并观察两个滚动条消失，JPanel中的对象放在应该放在哪里...
这种行为很好，我们希望保留这一点。您现在可以关闭该程序。
第3步：现在要删除右侧滚动条（在步骤1中），我们可以将一行代码（第＃145行）从//scrollPane.setPreferredSize(new Dimension(0, 160));更改为scrollPane.setPreferredSize(new Dimension(0, 160));，并重新运行该程序......
大！正确的栏被删除。但等一下......
第4步：现在让我们最大化窗口......
注意边框线之间添加了额外的空间（我们不希望出现这种情况）。
注1：保持显示/隐藏隐藏标签的选项非常重要，而无需调整GridBagLayout中的单元格大小。经过研究，我发现这样做的唯一方法是使用JLabel将隐藏的JPanel隐藏在GridLayout中。
注2：我注意到在宽度变得足够长以至于需要水平滚动条开始出现之后，这种行为（在步骤1中）开始发生。
我需要的是图像3（窗口未最大化时）和图像2（窗口最大化时）的行为。如果有人有任何想法让这两种行为组合在一起工作，请帮忙。感谢
更新：由于代码投诉过大，我将其缩短为169行。如上所述，此代码中的每个组件都需要监视2个行为。
0 个答案:
没有答案
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