java - 使用 GridBagLayout 在一个面板中设置多个组件,但我不想填满整个面板
问题描述
我正在开发一个使用 java swing 构建 GUI 的项目。目前我有一个Jpanel
应该JFrame
包含一个标签(问题)和一组按钮/文本字段(答案),它们可以根据被问到的问题而改变。我想让问题集中在顶部的某个地方,答案适当地集中在中间。目前我GridBagLayout
用来设置JLabel
and JButton
s 但仍然没有成功。
public class QuestionPanel extends MoviePanel{
private String question;
public QuestionPanel(String type, Application app, String question) throws Exception{
super(type, app);
this.question = question;
JLabel lab = new JLabel(this.question);
this.getGbc().anchor = GridBagConstraints.PAGE_START;
this.getGbc().fill = GridBagConstraints.HORIZONTAL;
this.getGbc().weighty = 0.5;
this.getGbc().gridx = 2;
this.getGbc().gridy = 0;
lab.setFont(new Font("Helvetica", Font.BOLD, 40));
lab.setForeground(new Color(189, 189, 189, 255));
add(lab, this.getGbc());
getAnswers(type);
}
private void getAnswers(String type){
if(type.equals("AgeRestriction")){
this.getGbc().gridx=0;
this.getGbc().gridy=1;
add(new YesButton(this.getApp()),this.getGbc());
this.getGbc().gridx = 3;
this.getGbc().gridy = 1;
add(new NoButton(this.getApp()),this.getGbc());
}
}
}
GridBagLayout
正在设置super MoviePanel
并this.getGbc()
返回适当的GridBagConstraints
。目前我的布局是这样的:
这个想法是让“是”和“否”按钮彼此靠近,并且未来按钮动态位于中心。
解决方案
我最终通过结合angushjoshi和c0der的答案来解决,因此在 questionPanel 中添加了一个 answerPanel 和 GridBagLayout。我的代码现在看起来像这样:
public class QuestionPanel extends MoviePanel {
private String question;
private JPanel answerPanel = new JPanel();
public QuestionPanel(String type, Application app, String question) throws Exception {
super(type, app);
this.question = question;
JLabel lab = new JLabel(this.question);
answerPanel.setOpaque(false);
this.getGbc().anchor = GridBagConstraints.PAGE_START;
this.getGbc().weighty = 1;
this.getGbc().gridy = 0;
this.getGbc().gridx = 2;
this.getGbc().gridwidth = 3;
lab.setFont(new Font("Helvetica", Font.BOLD, 40));
lab.setForeground(new Color(189, 189, 189, 255));
add(lab, this.getGbc());
getAnswers(type);
}
public void getAnswers(String type) {
if (type.equals("AgeRestriction")) {
createYesNoButtons();
}
if (type.equals("Age")) {
createAgeField();
}
if (type.equals("Genre")){
createGenreButtons();
}
if (type.equals("Actor")){
createActorField();
}
}
private void createYesNoButtons() {
this.getGbc().weighty = 0.5;
this.getGbc().anchor = GridBagConstraints.CENTER;
answerPanel.add(new YesButton(this.getApp()));
answerPanel.add(new NoButton(this.getApp()));
this.add(answerPanel,this.getGbc());
}
private void createAgeField() {
this.getGbc().weighty = 0.5;
this.getGbc().anchor = GridBagConstraints.CENTER;
answerPanel.add(new AgeField(this.getApp()));
this.add(answerPanel,this.getGbc());
}
private void createGenreButtons(){
}
private void createActorField(){
}
}
现在面板看起来像这样:
谢谢您的帮助!
解决方案
很难为您的问题提供一个准确的解决方案,但我可以告诉您,您可能想要使用GridBagConstraints.insets
and GridBagConstraints.anchor
。
insets
用于更改布局中对象周围的填充,即距 JPanel 边缘的最小距离。你可以这样使用它:
this.getGbc().insets = new Inset(top,right,bottom,left);
anchor
用于表示您希望将对象放置在布局中的哪个位置,例如:
this.getGbc().anchor = GridBagConstraints.CENTER;
以下是一些有用的GridBagConstraints.anchor
值:
FIRST_LINE_START ... PAGE_START ... FIRST_LINE_END
LINE_START ... CENTER ... LINE_END
LAST_LINE_START ... PAGE_END ... LAST_LINE_END