[英]CardLayout, panels from separate class not showing
我正在制作一個非常簡單的棋盤游戲的第一個GUI。 除了游戲視圖外,我還需要主菜單和其他一些視圖。 不幸的是,我的GUI早上看起來比我丑,因為整個菜單結構都在一個類中。 我使用卡布局在不同的視圖之間切換,因此我認為可以將這些視圖分為不同的類。 可悲的是,這是我遇到問題的地方。 我所得到的只是一個空白的窗口。
經過四個小時的研究,我無法解決我的問題,所以我問大家,你知道我的代碼有什么問題嗎? 即使艱難,我想我也已經排除了明顯的問題(不將面板添加到具有卡布局的面板中,不設置布局等)。我仍然認為問題必須非常簡單。 但是我發現沒有任何幫助。
因此,對於企業來說,這是我的“基本GUI”
package teekkariloikka.gui;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TLGui extends JFrame {
private static final long serialVersionUID = 1L;
private static final int WIDTH = 1000;
private static final int HEIGHT = 800;
private static final String MAINMENU = "mainmenu";
private static final String GAME = "game";
private JPanel basePanel;
private GameViewPanel gameViewPanel;
private MainMenuPanel mainMenuPanel;
JFrame frame = new JFrame();
//Layout
private CardLayout cardL = new CardLayout();
public TLGui(){
//Frame stuff
frame.setTitle("Teekkariloikka");
frame.setSize(WIDTH, HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setResizable(false);
//This is the panel where I add the ohter panels for menu and game
basePanel = new JPanel();
basePanel.setLayout(cardL);
//Creating the panels I want to add. Excuse the confusing naming.
gameViewPanel = new GameViewPanel();
mainMenuPanel = new MainMenuPanel();
//Adding the panels to the basePanel
basePanel.add(mainMenuPanel, MAINMENU);
basePanel.add(gameViewPanel, GAME);
cardL.show(basePanel, MAINMENU);
//ADDING basePanel to the frame
frame.add(basePanel);
//Action listeners for buttons. Take a look at the classes.
mainMenuPanel.setNewGameButtonListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
cardL.show(basePanel, GAME);
}
});
gameViewPanel.setMainMenuButtonListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){{
cardL.show(basePanel, MAINMENU);
}
});
}
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run(){
new TLGui();
}
});
}
}
然后是我的MainMenuPanel類。 這是一項正在進行的工作,但至少應顯示按鈕。 我盡力翻譯我用芬蘭語(母語)編寫的所有內容,我真的希望我對我的代碼不那么盲目,以至於我忘了一些東西。
package teekkariloikka.gui;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MainMenuPanel extends JPanel{
private static final long serialVersionUID = 1L;
//Buttons
private JPanel panel;
private JButton newGameButton;
private JButton quitButton;
//Font
Font menuFont = new Font("Arial", Font.BOLD, 24);
//Layout
private GridBagLayout menuLayout = new GridBagLayout();
private GridBagConstraints c1 = new GridBagConstraints();
public MainMenuPanel(){
panel = new JPanel();
//For testing //TODO remove
panel.setBackground(Color.BLACK);
newGameButton = new JButton("New Game");
quitButton = new JButton("Quit");
//New Game -button
newGameButton.setPreferredSize(new Dimension(200, 100));
newGameButton.setFont(menuFont);
//Quit-button
quitButton.setPreferredSize(new Dimension(200, 100));
quitButton.setFont(menuFont);
panel.setLayout(menuLayout);
c1.insets = new Insets(10, 10, 10, 10);
c1.gridx = 0;
c1.gridy = 1;
panel.add(newGameButton, c1);
c1.gridx = 0;
c1.gridy = 2;
panel.add(quitButton, c1);
}
//Idea: http://stackoverflow.com/questions/19104014/add-an-actionlistener-to-a-jbutton-from-another-class
public void setNewGameButtonListener(ActionListener listener){
newGameButton.addActionListener(listener);
}
public void setQuitButtonListener(ActionListener listener){
quitButton.addActionListener(listener);
}
}
和GameViewPanel類。 也正在進行中,但是像上一課一樣,看起來應該還不錯。
package teekkariloikka.gui;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class GameViewPanel extends JPanel{
private static final long serialVersionUID = 1L;
private JButton lopetaButton;
private JButton tallennaButton;
private JButton menuButton;
BorderLayout bordL = new BorderLayout();
public GameViewPanel(){
JPanel gameViewPanel = new JPanel();
gameViewPanel.setLayout(bordL);
gameViewPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
//Creating toolbar
JToolBar toolbar = new JToolBar();
toolbar.setFloatable(false);
gameViewPanel.setLayout(bordL);
gameViewPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
gameViewPanel.add(toolbar, BorderLayout.PAGE_START);
//Buttons
lopetaButton = new JButton("Lopeta");
menuButton = new JButton("Päävalikko");
tallennaButton = new JButton("Tallenna");
//Adding buttons to game view toolbar
toolbar.add(lopetaButton); //TODO Add functionality!
toolbar.add(tallennaButton); //TODO Add functionality!
toolbar.add(menuButton); //TODO Add functionality!
}
public void setMainMenuButtonListener(ActionListener listener){
menuButton.addActionListener(listener);
}
}
我希望有人能指出我犯的錯誤-不管我有多愚蠢。
同樣,任何其他反饋將不勝感激。 正如我所說的,這是我第一次編寫GUI,我必須時常感到非常迷茫。
cardL.show(basePanel, "2");
面板的名稱不是“ 2”。
您定義變量MAINMENU
和GAME
來代表每個面板的名稱。
在MainMenuPanel
窗格中,創建JPanel
的實例。
public MainMenuPanel(){
// A new panel
panel = new JPanel();
//For testing //TODO remove
panel.setBackground(Color.BLACK);
newGameButton = new JButton("New Game");
quitButton = new JButton("Quit");
//New Game -button
newGameButton.setPreferredSize(new Dimension(200, 100));
newGameButton.setFont(menuFont);
//Quit-button
quitButton.setPreferredSize(new Dimension(200, 100));
quitButton.setFont(menuFont);
panel.setLayout(menuLayout);
c1.insets = new Insets(10, 10, 10, 10);
c1.gridx = 0;
c1.gridy = 1;
panel.add(newGameButton, c1);
c1.gridx = 0;
c1.gridy = 2;
panel.add(quitButton, c1);
// But what do you do with panel??
}
但是不要將其添加到您的MainMenuPanel
...
您也可以在GameMenu
執行相同的GameMenu
...
public GameViewPanel(){
// Create JPanel...
JPanel gameViewPanel = new JPanel();
gameViewPanel.setLayout(bordL);
gameViewPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
//Creating toolbar
JToolBar toolbar = new JToolBar();
toolbar.setFloatable(false);
gameViewPanel.setLayout(bordL);
gameViewPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
gameViewPanel.add(toolbar, BorderLayout.PAGE_START);
//Buttons
lopetaButton = new JButton("Lopeta");
menuButton = new JButton("Päävalikko");
tallennaButton = new JButton("Tallenna");
//Adding buttons to game view toolbar
toolbar.add(lopetaButton); //TODO Add functionality!
toolbar.add(tallennaButton); //TODO Add functionality!
toolbar.add(menuButton); //TODO Add functionality!
// But never do anything with it...
}
我的建議是,不要。 MainMenuPanel
和GameMenu
都是從JPanel
擴展的,只需直接在這些面板的GameMenu
創建UI。 似乎不需要這些“內部”面板...
好吧,當我繼續其他事情時,我實際上自己就找到了答案。 在研究一些布局設計時,我看到了這段代碼,並有了在面板類中使用“ this”引用的想法。
所以我從MainMenuPanel
和GameviewPanel
刪除了這段代碼
// A new panel
panel = new JPanel();
然后用this
替換對該面板的引用。 來自MainMenuPanel
示例:
this.setLayout(menuLayout);
c1.insets = new Insets(10, 10, 10, 10);
c1.gridx = 0;
c1.gridy = 1;
this.add(newGameButton, c1);
c1.gridx = 0;
c1.gridy = 2;
this.add(quitButton, c1);
我不能說我完全理解為什么這樣做有效,反之則不行,但是目前,我只需要一個可行的解決方案。 我希望這一天對其他人也有用。
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