我是java中的菜鳥，正在嘗試制作一種文字冒險游戲。我希望能夠讓程式在從一種 UI 布局轉換到另一種布局時具有某種淡入淡出能力。
我真的不知道解決這個問題的最佳方法是什么，或者它是否真的可行，但到目前為止，我一直在嘗試讓一個 Jpanel 覆寫整個視窗并使用計時器淡入以覆寫黑色的所有其他內容，或從黑色淡出到透明，從而露出下面的一切。
我一直在通過嘗試在開始時淡入/淡出程式來測驗這個想法，只是為了讓淡入淡出系統的邏輯在嘗試將其作為過渡效果之前作業。淡出型別的作品，但我有程式輸出 alpha 級別，螢屏在 255 中的 alpha 50 左右變黑，這讓我感到困惑。淡入根本不起作用。
這是淡入淡出方法的代碼：
static int opacityCounter = 0;
public void fadeOut(JPanel frame){
System.out.println(opacityCounter);
opacityCounter = 0;
fadeTimer = new Timer(50, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
frame.setBackground(new Color(0,0,0,opacityCounter));
opacityCounter ;
gui.window.add(frame);
if(opacityCounter >= 255){
opacityCounter = 255;
fadeTimer.stop();
}
System.out.println(opacityCounter);
}
});
fadeTimer.start();
}
這是在方法中創建和部署覆寫視窗的“fadePanel”的代碼。
fadeScreen = new JPanel();
fadeScreen.setBounds(0,0,800,600);
fadeScreen.setBackground(Color.black);
window.add(fadeScreen);
game.visibilityManager.fadeOut(this.fadeScreen);
為了澄清我想要來自這樣的 UI 布局的東西：
淡入黑色，然后淡入類似這樣的 UI 
這是一個最小的可重現示例：
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Test {
JFrame window;
JPanel fadeScreen, screen1, screen2;
JLabel text1, text2;
Timer fadeTimer;
public Test(){
//Frame Window
window = new JFrame();
window.setSize(800,600);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().setBackground(Color.blue);
//Screen 1
screen1 = new JPanel();
screen1.setBounds(100, 100, 600, 125);
screen1.setBackground(Color.white);
text1 = new JLabel("Text1");
screen1.add(text1);
window.add(screen1);
//Screen 2
screen2 = new JPanel();
screen2.setBounds(100, 400, 600, 125);
screen2.setBackground(Color.white);
text2 = new JLabel("Text2");
screen2.add(text2);
window.add(screen2);
//Cover Panel
fadeScreen = new JPanel();
fadeScreen.setBounds(0,0,800,600);
fadeScreen.setBackground(Color.black);
window.add(fadeScreen);
window.setVisible(true);
//Comment out which method you don't want to use
fadeOut(this.fadeScreen);
//fadeIn(this.fadeScreen);
}
//Fade methods
int opacityCounter = 0;
public void fadeOut(JPanel frame){
System.out.println(opacityCounter);
opacityCounter = 0;
fadeTimer = new Timer(50, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
frame.setBackground(new Color(0,0,0,opacityCounter));
opacityCounter ;
window.add(frame);
if(opacityCounter >= 255){
opacityCounter = 255;
fadeTimer.stop();
}
System.out.println(opacityCounter);
}
});
fadeTimer.start();
}
public void fadeIn(JPanel frame){
System.out.println(opacityCounter);
opacityCounter = 255;
fadeTimer = new Timer(50, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
frame.setBackground(new Color(0,0,0,opacityCounter));
opacityCounter--;
window.add(frame);
if(opacityCounter <= 0){
opacityCounter = 0;
fadeTimer.stop();
}
System.out.println(opacityCounter);
}
});
fadeTimer.start();
}
public static void main(String[] args){
new Test();
}
}
提前致謝！
uj5u.com熱心網友回復：
我會嘗試這些事情：
- 使用頂層視窗的 GlassPane 并使用 Swing Timer 使您想要遮蓋的部分變暗。
- 使用 CardLayout 交換底層組件，并在覆寫的 JPanel 最暗時進行交換。
- 然后在交換后使覆寫面板變暗。
例如（后面要寫更多的代碼解釋）：
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.Point;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class Test2 extends JPanel {
public static final String PANEL_1 = "panel 1";
public static final String PANEL_2 = "panel 2";
private CardLayout cardLayout = new CardLayout();
private JPanel cardPanel = new JPanel(cardLayout);
private JPanel panel1 = new JPanel();
private JPanel panel2 = new JPanel();
private Action fadeAction = new FadeAction(cardPanel);
public Test2() {
JLabel label = new JLabel("Panel 1");
label.setFont(label.getFont().deriveFont(Font.BOLD, 100f));
panel1.setLayout(new GridBagLayout());
int gap = 40;
panel1.setBorder(BorderFactory.createEmptyBorder(gap, gap, gap, gap));
panel1.add(label);
panel1.setBackground(Color.PINK);
label = new JLabel("Panel 2");
label.setFont(label.getFont().deriveFont(Font.BOLD, 100f));
panel2.setLayout(new GridBagLayout());
panel2.setBorder(BorderFactory.createEmptyBorder(gap, gap, gap, gap));
panel2.add(label);
panel2.setBackground(new Color(131, 238, 255));
cardPanel.add(panel1, PANEL_1);
cardPanel.add(panel2, PANEL_2);
JButton startFadeBtn = new JButton(fadeAction);
JPanel buttonPanel = new JPanel();
buttonPanel.add(startFadeBtn);
setLayout(new BorderLayout(5, 5));
add(cardPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.PAGE_END);
}
private static class FadeAction extends AbstractAction {
private static final int FADE_DELAY = 20;
private static final int UNFADE_VALUE = 255;
private JPanel cardPanel;
private JComponent glassPane;
private JPanel coverPanel = new JPanel();
private Timer fadeTimer;
private int counter = 0;
private boolean fade = true;
public FadeAction(JPanel cardPanel) {
super("Start Fade");
putValue(MNEMONIC_KEY, KeyEvent.VK_S);
this.cardPanel = cardPanel;
}
@Override
public void actionPerformed(ActionEvent e) {
counter = 0;
fade = true;
setEnabled(false);
CardLayout cl = (CardLayout) cardPanel.getLayout();
cl.show(cardPanel, PANEL_1);
Window topLevelWindow = SwingUtilities.getWindowAncestor(cardPanel);
glassPane = (JComponent) ((RootPaneContainer) topLevelWindow).getRootPane().getGlassPane();
glassPane.setVisible(true);
glassPane.setLayout(null);
coverPanel.setSize(cardPanel.getSize());
int x = cardPanel.getLocationOnScreen().x - glassPane.getLocationOnScreen().x;
int y = cardPanel.getLocationOnScreen().y - glassPane.getLocationOnScreen().y;
Point coverPanelPoint = new Point(x, y);
coverPanel.setLocation(coverPanelPoint);
glassPane.add(coverPanel);
fadeTimer = new Timer(FADE_DELAY, e2 -> fadeTimerActionPerformed(e2));
fadeTimer.start();
}
private void fadeTimerActionPerformed(ActionEvent e) {
coverPanel.setBackground(new Color(0, 0, 0, counter));
glassPane.repaint();
if (fade) {
counter ;
} else if (counter > 0) {
counter--;
} else {
glassPane.remove(coverPanel);
glassPane.setVisible(false);
setEnabled(true);
((Timer) e.getSource()).stop();
}
if (counter >= UNFADE_VALUE) {
fade = false;
CardLayout cl = (CardLayout) cardPanel.getLayout();
cl.show(cardPanel, PANEL_2);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new Test2());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
});
}
}
uj5u.com熱心網友回復：
這是充滿鰻魚的氣墊船的答案。我所做的只是清理 GUI 創建并演示如何使用兩個以上的JPanels.
我創建了五個JPanels并使用淡出/淡入效果按順序顯示它們。
這是完整的可運行代碼。
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.RootPaneContainer;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class FadeEffectsTesting {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new JFrame("Fade Effects Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new FadeEffectsTesting().getMainPanel());
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
});
}
public static final String[] PANEL_SEQUENCE = { "Panel 1", "Panel 2", "Panel 3", "Panel 4",
"Panel 5" };
private int sequence = 0;
private CardLayout cardLayout;
private FadeAction action;
private JPanel cardPanel, mainPanel;
public FadeEffectsTesting() {
this.mainPanel = new JPanel(new BorderLayout(5, 5));
this.cardPanel = createCardPanel();
this.action = new FadeAction(cardPanel);
mainPanel.add(cardPanel, BorderLayout.CENTER);
mainPanel.add(createButtonPanel(), BorderLayout.PAGE_END);
}
private JPanel createCardPanel() {
cardLayout = new CardLayout();
JPanel panel = new JPanel(cardLayout);
panel.add(createTextPanel(Color.PINK, PANEL_SEQUENCE[0]),
PANEL_SEQUENCE[0]);
panel.add(createTextPanel(new Color(131, 238, 255),
PANEL_SEQUENCE[1]), PANEL_SEQUENCE[1]);
panel.add(createTextPanel(Color.PINK, PANEL_SEQUENCE[2]),
PANEL_SEQUENCE[2]);
panel.add(createTextPanel(new Color(131, 238, 255),
PANEL_SEQUENCE[3]), PANEL_SEQUENCE[3]);
panel.add(createTextPanel(Color.PINK, PANEL_SEQUENCE[4]),
PANEL_SEQUENCE[4]);
return panel;
}
private JPanel createTextPanel(Color color, String text) {
JPanel panel = new JPanel(new FlowLayout());
panel.setBackground(color);
int gap = 40;
panel.setBorder(BorderFactory.createEmptyBorder(gap, gap, gap, gap));
JLabel label = new JLabel(text);
label.setFont(label.getFont().deriveFont(Font.BOLD, 72f));
panel.add(label);
return panel;
}
private JPanel createButtonPanel() {
JPanel panel = new JPanel(new FlowLayout());
setFadeAction();
JButton startFadeBtn = new JButton(action);
panel.add(startFadeBtn);
return panel;
}
public void setFadeAction() {
action.setFromPanel(PANEL_SEQUENCE[sequence]);
action.setToPanel(PANEL_SEQUENCE[sequence 1]);
}
public JPanel getMainPanel() {
return mainPanel;
}
public class FadeAction extends AbstractAction {
private static final long serialVersionUID = 1L;
private static final int FADE_DELAY = 20;
private static final int UNFADE_VALUE = 255;
private JPanel cardPanel;
private JComponent glassPane;
private JPanel coverPanel;
private Timer fadeTimer;
private int alphaValue;
private boolean fadeOut;
private String fromPanel, toPanel;
public FadeAction(JPanel cardPanel) {
super("Start Fade");
this.putValue(MNEMONIC_KEY, KeyEvent.VK_S);
this.cardPanel = cardPanel;
this.alphaValue = 0;
this.fadeOut = true;
}
public void setFromPanel(String fromPanel) {
this.fromPanel = fromPanel;
}
public void setToPanel(String toPanel) {
this.toPanel = toPanel;
}
@Override
public void actionPerformed(ActionEvent event) {
alphaValue = 0;
fadeOut = true;
setEnabled(false);
CardLayout cl = (CardLayout) cardPanel.getLayout();
cl.show(cardPanel, fromPanel);
Window topLevelWindow = SwingUtilities.getWindowAncestor(cardPanel);
glassPane = (JComponent) ((RootPaneContainer) topLevelWindow).getRootPane()
.getGlassPane();
glassPane.setLayout(null);
coverPanel = new JPanel();
coverPanel.setSize(cardPanel.getSize());
glassPane.add(coverPanel);
glassPane.setVisible(true);
fadeTimer = new Timer(FADE_DELAY, e2 -> fadeTimerActionPerformed(e2));
fadeTimer.start();
}
private void fadeTimerActionPerformed(ActionEvent event) {
coverPanel.setBackground(new Color(0, 0, 0, alphaValue));
glassPane.repaint();
if (fadeOut) {
alphaValue = 3;
} else if (alphaValue > 0) {
alphaValue -= 3;
} else {
glassPane.remove(coverPanel);
glassPane.setVisible(false);
((Timer) event.getSource()).stop();
if ( sequence < (PANEL_SEQUENCE.length - 1)) {
setFadeAction();
setEnabled(true);
}
}
if (alphaValue >= UNFADE_VALUE) {
fadeOut = false;
CardLayout cl = (CardLayout) cardPanel.getLayout();
cl.show(cardPanel, toPanel);
}
}
}
}
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