将JPanel从另一个类添加到JFrame中的JPanel [英] Adding JPanel from another class to JPanel in JFrame
问题描述
我无法从主类获取JFrame来显示另一类的JPanel.一切都能正确编译.
I can't get my JFrame from main class to display JPanel from another class. Everything compiles without errors.
JFrameTest.java:
package jframetest;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JFrameTest extends JFrame {
public JFrameTest() {
FlowLayout mainLayout = new FlowLayout();
setSize(320, 480);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(mainLayout);
JPanel panelMain = new JPanel(mainLayout);
JButton testButton = new JButton("Test12");
panelMain.add(testButton);
JPanelOne panel = new JPanelOne();
panelMain.add(panel);
panel.setVisible(true);
add(panelMain);
}
public static void main(String[] arguments) {
JFrameTest frame = new JFrameTest();
frame.setVisible(true);
}
}
JPanelOne.java:
package jframetest;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JPanel;
public class JPanelOne extends JPanel {
public JPanelOne() {
FlowLayout layoutPanel = new FlowLayout();
JPanel panel = new JPanel(layoutPanel);
JButton button = new JButton("test");
panel.add(button);
panel.setVisible(true);
}
}
将不同的JPanels保留在自己的类中是一种好习惯吗? (例如:希望JFrame包含几个相同大小的JPanel，可以通过将 setVisible()设置为true/false来切换)
Is it good practice to keep diffrent JPanels in their own classes? (Example: Wanting to have JFrame contain few same size JPanels, which will be switched by setting setVisible() to true/false)
编辑
感谢您的所有回答.著名的.现在回到我的问题:
Thank you for all your answers. Noted. Now back to my question:
现在，我知道如何添加在其他类中创建的单个GUI元素，我想知道是否可以使用其中一个类中的布局管理器来组织元素(也许在JPanel之外的其他容器中)，所以我可以添加它们作为一个按布局组织的小组(这就是为什么我要在其他类中创建整个JPanel的原因).如图所示:
Now that I know how to add single GUI elements created in other classes I want to know if it is possible to organize elements with layout manager in one of the classes (maybe in some other container than JPanel), so I can add them as a group organized in a layout (thats why I was asking about creating whole JPanel in other class). As on the picture:
JPanel(第二类)代码为:
JPanel (that 2nd class) code for this example would be:
package jframetest;
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import net.miginfocom.swing.MigLayout;
public class JPanelOne extends JPanel {
private JPanel panelSettingsMain;
private JLabel labelChooseLanguage, labelWordsCollection;
private JButton buttonSelectLanguage, buttonSelectCollection,
buttonStatistics, buttonPrintingOptions, buttonAddNewWordCollection,
buttonInterfaceCustomization;
private JSeparator separatorSettingsOne, separatorSettingsTwo,
separatorSettingsThree, separatorSettingsFour,
separatorSettingsFive;
private Color greenRegular, separatorGreenLight, separatorGreenDark;
public JPanelOne() {
// creating settings main panel
// setting up layout managers
MigLayout layoutSettingsMain = new MigLayout(
"insets 3 0 0 0");
// setting up colors
greenRegular = new Color(30, 165, 145);
separatorGreenLight = new Color(190, 240, 220);
separatorGreenDark = new Color(130, 205, 180);
panelSettingsMain = new JPanel(layoutSettingsMain);
panelSettingsMain.setBackground(Color.WHITE);
// setting up choose language label
labelChooseLanguage = new JLabel("Choose language:");
panelSettingsMain.add(labelChooseLanguage,
"gapleft 10, gaptop 15, width 200");
// setting up select language button
buttonSelectLanguage = new JButton("language");
buttonSelectLanguage.setForeground(greenRegular);
buttonSelectLanguage.setFocusPainted(false);
buttonSelectLanguage.setBorder(null);
buttonSelectLanguage.setContentAreaFilled(false);
buttonSelectLanguage.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonSelectLanguage, "gapbottom 15px, wrap");
// setting up light separator
separatorSettingsOne = new JSeparator();
separatorSettingsOne.setForeground(separatorGreenLight);
panelSettingsMain.add(separatorSettingsOne,
"span 2, width 320, gapbottom 15, wrap");
// setting up words collection label
labelWordsCollection = new JLabel("Words collection:");
panelSettingsMain.add(labelWordsCollection, "gapleft 10");
// setting up selectcollection button
buttonSelectCollection = new JButton("collection");
buttonSelectCollection.setForeground(greenRegular);
buttonSelectCollection.setFocusPainted(false);
buttonSelectCollection.setBorder(null);
buttonSelectCollection.setContentAreaFilled(false);
buttonSelectCollection.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonSelectCollection,
"gapbottom 15px, wrap");
// setting up dark separator
separatorSettingsTwo = new JSeparator();
separatorSettingsTwo.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsTwo,
"span 2, width 320, gapbottom 15px, wrap");
// setting up show statistics button
buttonStatistics = new JButton("Show statistics");
buttonStatistics.setForeground(greenRegular);
buttonStatistics.setFocusPainted(false);
buttonStatistics.setBorder(null);
buttonStatistics.setContentAreaFilled(false);
buttonStatistics.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonStatistics,
"gapleft 10, gapbottom 15px, , wrap");
// setting up dark separator
separatorSettingsThree = new JSeparator();
separatorSettingsThree.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsThree,
"span 2, width 320, gapbottom 15px, wrap");
// setting up printing options button
buttonPrintingOptions = new JButton("Printing options");
buttonPrintingOptions.setForeground(greenRegular);
buttonPrintingOptions.setFocusPainted(false);
buttonPrintingOptions.setBorder(null);
buttonPrintingOptions.setContentAreaFilled(false);
buttonPrintingOptions.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonPrintingOptions,
"gapleft 10, gapbottom 15px, wrap");
// setting up dark separator
separatorSettingsFour = new JSeparator();
separatorSettingsFour.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsFour,
"span 2, width 320, gapbottom 15px, wrap");
// setting up add new word collection button
buttonAddNewWordCollection = new JButton("Add new word collection");
buttonAddNewWordCollection.setForeground(greenRegular);
buttonAddNewWordCollection.setFocusPainted(false);
buttonAddNewWordCollection.setBorder(null);
buttonAddNewWordCollection.setContentAreaFilled(false);
buttonAddNewWordCollection.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonAddNewWordCollection,
"gapleft 10, gapbottom 15px, , wrap");
// setting up dark separator
separatorSettingsFive = new JSeparator();
separatorSettingsFive.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsFive,
"span 2, width 320, gapbottom 10px, wrap");
// setting up interface customization button
buttonInterfaceCustomization = new JButton(
"Interface customization");
buttonInterfaceCustomization.setForeground(greenRegular);
buttonInterfaceCustomization.setFocusPainted(false);
buttonInterfaceCustomization.setBorder(null);
buttonInterfaceCustomization.setContentAreaFilled(false);
buttonInterfaceCustomization.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonInterfaceCustomization,
"gapleft 10, gapbottom 15px, wrap");
}
}
我当时正在考虑通过将JPanels(在示例中类似)设置为可见或不可见来浏览程序GUI.
I was thinking about navigating through the program GUI by setting JPanels (ones like in the example) to visible or not visible.
- 这是个好方法吗?
- 我应该将GUI分成几个类，还是应该将所有内容都放在一个类中?我问，因为现在代码中只有GUI的一半，它的长度约为400行(此时，它只能做看"而不能做任何事情).就像我之前说过的-我是初学者，它是我到目前为止编写的最长的应用程序之一(我相信它肯定不会那么长！).
编辑
也许我想得太过分了，所以最后可以使用大型GUI类并通过将它们设置为可见来控制不同GUI区域的可见性吗?
Maybe I am overthinking it, so in the end is it ok to have big GUI classes and to control visibility of different GUI areas by setting them visible or not?
编辑
我研究了Oracle的CardLayout教程，它看起来很适合我的任务(不包括从外部类创建JPanels，但这没关系).起初我误会了它，只是在选项卡式窗格(我不想在我的项目中实现)方面考虑CardLayout.
I've looked into the CardLayout tutorial at Oracle and it looks like it is good for my task (excluding the creating JPanels from the external classes, but it is ok). I misunderstood it at first and was thinking about CardLayout only in terms of tabbed pane (which I didn't want to implement in my project).
推荐答案
在更多帮助下(其他站点的用户"Hilek")，我设法从另一个类中获取JPanel，从而使主类不满意.这是代码:
With some more help (user "Hilek" from some other site) I menaged to get the JPanel from another class to be displeyed in main class. Here is the code:
JFrameTest.java:
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JFrameTest extends JFrame {
private JButton testButton;
private JPanel panelMain;
private JPanelOne panel;
public JFrameTest() {
// setting up JFrame
setLayout(null);
setPreferredSize(new Dimension(420, 90));
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// creating main JPanel (white)
panelMain = new JPanel();
panelMain.setBackground(Color.WHITE);
panelMain.setBounds(0, 0, 420, 90);
panelMain.setPreferredSize(new Dimension(200, 40));
add(panelMain);
// creating JButton in the main JPanel (white)
testButton = new JButton("Button from main class");
panelMain.add(testButton);
// creating new JPanelOne object from JPanelOne class containing black JPanel
panel = new JPanelOne();
// adding black JPanel to main JPanel (white)
panelMain.add(panel);
pack();
}
public static void main(String[] arguments) {
// creating JFrame object and setting it visible
JFrameTest frame = new JFrameTest();
frame.setVisible(true);
}
}
JPanelOne.java:
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
public class JPanelOne extends JPanel
{
public JPanelOne()
{
// setting up black JPanel
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(220, 40));
panel.setBackground(Color.BLACK);
// creating button on external JPanel
JButton button = new JButton("Button (+JPanel) from external class");
// adding button to the black JPanel
panel.add(button);
// adding blackJPanel
add(panel);
}
}
工作示例的打印屏幕:
http://i.stack.imgur.com/qKeBp.jpg
也许有人会发现它对他们的问题有帮助.
Maybe someone will find it helpful in their problem.
这篇关于将JPanel从另一个类添加到JFrame中的JPanel的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
