处理Java GUI/Canvas项目
处理Java GUI/Canvas项目
提问于 2012-10-23 10:49:03
嗨，我是Java中的GUI和Canvas的新手。我正在做一个项目，我需要一个GUI/Canvas (仍然不清楚区别)，我想它有三个框架。基本上，它是一个电梯项目，在画布的两侧都有一个矩形电梯对象，中间是用于表示楼层的按钮(彼此堆叠在一起)(因此，如果单击按钮，电梯将移动到与按钮相同的行)。我被困在如何为此设计画布。我对gridLayout和broderLayouts有一些想法，但现在都是乱七八糟的。
谢谢
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
public class UI extends JFrame implements ActionListener
{
ArrayList<JButton> buttonList = new ArrayList();
MyCanvas mainCanvas;
public UI()
{
super("Example Frame");
setSize(800,600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
mainCanvas = new MyCanvas();
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout(1,3));
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(12,1));
//while(true)
//{
// myCanvas.repaint();
//}
for(int i=1; i<13; i++)
{ String s = Integer.toString(i);
buttonPanel.add(new JButton(s));
}
add(mainPanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainPanel.add(buttonPanel, BorderLayout.CENTER);
}回答 2
Stack Overflow用户
回答已采纳
发布于 2012-10-23 13:42:09
这是一个负载很大的问题。
如果它纯粹是关于布局的，那么我会使用一系列具有自己的布局的复合组件来实现您需要的结果……
如果是关于方法，那就更复杂了.
基本上，您希望分离职责范围。
从问题中可以看出，有两个不同的模型，一个电梯模型和一个建筑物模型。
电梯模型控制单个竖井的电梯位置，建筑模型控制楼层数、各个电梯型号、确定电梯如何到达楼层的算法...
下面是一个想法的基本例子。它缺少(在其他方面)呼叫电梯到楼层所需的逻辑，或者关于电梯的有状态信息(移动、等待、打开...)
public class Elevator {
public static void main(String[] args) {
new Elevator();
}
public Elevator() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new BuildingPane());
frame.pack();
frame.setVisible(true);
}
});
}
public enum ElevatorShaft {
Left,
Right
}
public interface ElevatorModel {
public int getFloor();
public void setFloor(int floor);
public void addPropertyChangeListener(PropertyChangeListener listener);
public void removePropertyChangeListener(PropertyChangeListener listener);
}
public class DefaultElevatorModel implements ElevatorModel {
private int floor;
private PropertyChangeSupport propertyChangeSupport;
public DefaultElevatorModel(int floor) {
this.floor = floor;
propertyChangeSupport = new PropertyChangeSupport(this);
}
@Override
public void addPropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(listener);
}
@Override
public void removePropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.removePropertyChangeListener(listener);
}
@Override
public int getFloor() {
return floor;
}
@Override
public void setFloor(int value) {
if (value != floor) {
int old = floor;
floor = value;
propertyChangeSupport.firePropertyChange("floor", old, floor);
}
}
}
public interface BuildingModel {
public int getFloorCount();
public int getFloor(ElevatorShaft shaft);
public ElevatorModel getElevatorModel(ElevatorShaft shaft);
public void call(int floor);
}
public class DefaultBuildingModel implements BuildingModel {
private int floorCount;
private Map<ElevatorShaft, ElevatorModel> shaftManager;
public DefaultBuildingModel(int floorCount) {
this.floorCount = floorCount;
shaftManager = new HashMap<ElevatorShaft, ElevatorModel>(2);
shaftManager.put(ElevatorShaft.Left, new DefaultElevatorModel((int)Math.round(Math.random() * (floorCount - 1))));
shaftManager.put(ElevatorShaft.Right, new DefaultElevatorModel((int)Math.round(Math.random() * (floorCount - 1))));
}
@Override
public ElevatorModel getElevatorModel(ElevatorShaft shaft) {
return shaftManager.get(shaft);
}
@Override
public int getFloorCount() {
return floorCount;
}
@Override
public int getFloor(ElevatorShaft shaft) {
return shaftManager.get(shaft).getFloor();
}
@Override
public void call(int floor) {
// This will need to determine which elevator should be called
// and call that elevators model "setFloor" method...
}
}
public class BuildingPane extends JPanel {
public BuildingPane() {
setLayout(new GridBagLayout());
BuildingModel model = new DefaultBuildingModel(3);
Shaft leftShaft = new Shaft(model, ElevatorShaft.Left);
Shaft rightShaft = new Shaft(model, ElevatorShaft.Right);
ButtonsPane buttonsPane = new ButtonsPane(model);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.VERTICAL;
add(leftShaft, gbc);
gbc.gridx++;
add(buttonsPane, gbc);
gbc.gridx++;
add(rightShaft, gbc);
}
}
public class ButtonsPane extends JPanel {
private BuildingModel model;
public ButtonsPane(BuildingModel model) {
this.model = model;
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weighty = 1;
gbc.anchor = GridBagConstraints.CENTER;
int floorCount = model.getFloorCount();
ActionHandler handler = new ActionHandler();
for (int floor = floorCount; floor > 0; floor--) {
JButton button = new JButton("Floor " + floor);
button.setActionCommand(Integer.toString(floor));
button.addActionListener(handler);
add(button, gbc);
gbc.gridy++;
}
}
public BuildingModel getModel() {
return model;
}
public class ActionHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
try {
int floor = Integer.parseInt(cmd);
getModel().call(floor);
} catch (NumberFormatException exp) {
exp.printStackTrace();
}
}
}
}
public class Shaft extends JPanel {
private BufferedImage elevator;
private BuildingModel buildingModel;
private ElevatorShaft shaft;
public Shaft(BuildingModel model, ElevatorShaft shaft) {
this.buildingModel = model;
this.shaft = shaft;
buildingModel.getElevatorModel(shaft).addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equalsIgnoreCase("floor")) {
// Need to update our position, this could
// be done via animation or directly call something
// like repaint..
}
}
});
setBorder(new LineBorder(Color.DARK_GRAY));
setBackground(Color.GRAY);
try {
elevator = ImageIO.read(new File("elevator.png"));
} catch (IOException ex) {
Logger.getLogger(Elevator.class.getName()).log(Level.SEVERE, null, ex);
}
}
public BuildingModel getBuildingModel() {
return buildingModel;
}
public ElevatorShaft getShaft() {
return shaft;
}
public int getFloorCount() {
return getBuildingModel().getFloorCount();
}
public int getFloor() {
return getBuildingModel().getFloor(getShaft());
}
@Override
public Dimension getPreferredSize() {
Dimension size = new Dimension(elevator.getWidth(), elevator.getHeight() * getFloorCount());
Insets insets = getInsets();
size.width += (insets.left + insets.right);
size.height += (insets.top + insets.bottom);
return size;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Insets insets = getInsets();
int x = insets.left;
int y = insets.top;
int height = getHeight() - (insets.top + insets.bottom);
int floor = getFloor();
y = height - (elevator.getHeight() * (floor + 1));
g.drawImage(elevator, x, y, this);
}
}
}Stack Overflow用户
发布于 2012-10-23 11:20:10
我如何改变你的类是这样的(注意这是伪代码，你需要实际实现一个操作监听器来处理按钮按下)--
public class UI extends JFrame implements ActionListener
{
ArrayList<JButton> buttonList = new ArrayList();
int x = 0;
int y = 0;
int width = 50;
int height = 50;
public UI()
{
super("Example Frame");
setSize(800,600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout(1,3));
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(12,1));
for(int i=1; i<13; i++)
{ String s = Integer.toString(i);
buttonPanel.add(new JButton(s));
}
add(mainPanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainPanel.add(buttonPanel, BorderLayout.CENTER);
}
public void paint(Graphics g){
super.paint(g);
g.drawRect(x,y,width,height);
}
onButtonPress(int buttonNumber){
y = buttonNumber * 10;
repaint();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/13022853
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