Java -实现mvc
Java -实现mvc
提问于 2012-01-03 02:27:01
我刚刚开始使用MVC模式做Java应用程序，到目前为止，我发现它简化了我的工作，解决了很多问题。现在，我有几个问题困扰着我，或者现在不知道该如何解决：
以下是我的UI视图：
package env.view;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import net.miginfocom.swing.MigLayout;
import env.helper.*;
public class UI_View extends JFrame
{
private JPanel left = new JPanel(new MigLayout());
private JPanel center = new JPanel(new MigLayout());
private JPanel right = new JPanel(new MigLayout());
//LEFT PANEL
private Tower_Helper towers = new Tower_Helper();
private Tree_Helper modules = new Tree_Helper();
private JScrollPane mod_bar = new JScrollPane(modules);
//CENTER PANEL
private Browse_Helper browser = new Browse_Helper();
private JScrollPane browser_bar = new JScrollPane(browser);
//RIGHT PANEL - LABELS
private JLabel tower_name = new JLabel("No tower selected");
private JLabel shield = new JLabel("0");
private JLabel armor = new JLabel("0");
private JLabel em = new JLabel("0.0");
private JLabel th = new JLabel("0.0");
private JLabel kn = new JLabel("0.0");
private JLabel ex = new JLabel("0.0");
//RIGHT PANEL - CONTROLLS
private JProgressBar cap_bar = new JProgressBar();
private JProgressBar cpu_bar = new JProgressBar();
private int total = 0;
private int consumed = 0;
public UI_View()
{
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setMinimumSize(new Dimension(800, 600));
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
this.setTitle("Environment Prototype");
this.setLayout(new MigLayout());
left.setMinimumSize(new Dimension(252, 540));
left.setMaximumSize(new Dimension(252, 37500));
left.add(towers, "growx, pushx, wrap");
left.add(mod_bar,"grow, push");
center.setMinimumSize(new Dimension(298, 540));
center.add(browser_bar, "grow, push");
right.setMinimumSize(new Dimension(250, 540));
right.setMaximumSize(new Dimension(250, 37500));
tower_name.setToolTipText("Double click to remove tower if modules have been removed.");
right.add(tower_name, "span, wrap");
right.add(new JLabel(""), "wrap, span");
right.add(new JLabel(""), "wrap, span");
right.add(new JLabel("Capacitor"), "wrap, span");
cap_bar.setMinimumSize(new Dimension(215, 40));
right.add(cap_bar, "wrap, span");
right.add(new JLabel("CPU"), "wrap, span");
cpu_bar.setMinimumSize(new Dimension(215, 40));
right.add(cpu_bar, "wrap, span");
right.add(new JLabel("Shield: "));
right.add(shield, "wrap");
right.add(new JLabel("Armor: "));
right.add(armor, "wrap");
right.add(new JLabel(""), "wrap, span");
right.add(new JLabel(""), "wrap, span");
right.add(new JLabel("EM: "));
right.add(em, "wrap");
right.add(new JLabel("TH: "));
right.add(th, "wrap");
right.add(new JLabel("KN: "));
right.add(kn, "wrap");
right.add(new JLabel("EX: "));
right.add(ex, "wrap");
this.add(left, "dock west");
this.add(center, "dock center");
this.add(right, "dock east");
}
//getter - JLabel tower name
public JLabel getTowerNameLabel()
{
return this.tower_name;
}
//listener - JLabel tower name
public void towerLabelListner(MouseListener event)
{
this.tower_name.addMouseListener(event);
}
//getter - JList browser
public JList getBrowserList()
{
return this.browser;
}
//listener - JList browser
public void browserListListener(MouseListener event)
{
this.browser.addMouseListener(event);
}
//getter - JTree modules
public JTree getModuleTree()
{
return this.modules;
}
//listener - JTree modules
public void modulesTreeListener(MouseListener event)
{
this.modules.addMouseListener(event);
}
//getter - JComboBox towers
public JComboBox getTowers()
{
return this.towers;
}
//lisetner - JComboBox towers
public void towersBoxListener(ActionListener evnet)
{
this.towers.addActionListener(evnet);
}
}这是我的UI控制器
package env.controller;
import env.model.UI_Model;
import env.view.UI_View;
import java.awt.event.*;
import javax.swing.*;
public class UI_Controller
{
private UI_Model ui_model;
private UI_View ui_view;
public UI_Controller(UI_Model model, UI_View view)
{
ui_model = model;
ui_view = view;
ui_view.towersBoxListener(new towerSelectionListener());
ui_view.modulesTreeListener(new modulesSelectionListener());
ui_view.browserListListener(new browserSelectionListener());
ui_view.towerLabelListner(new towerRemovalListener());
}
class towerRemovalListener implements MouseListener
{
@Override public void mouseClicked(MouseEvent e)
{
if(e.getClickCount() == 2 && ui_model.getModulesCounter() == 0)
{
ui_view.getTowerNameLabel().setText(ui_model.reset_label());
ui_model.retsetSelectionInfo();
} else if (ui_model.getModulesCounter() != 0){
JFrame dialog = new JFrame();
JOptionPane.showMessageDialog(dialog, "Cannot remove tower whit modules still selected.",
"Cannot remove tower !", JOptionPane.WARNING_MESSAGE);
}
}
@Override public void mousePressed(MouseEvent e) {}
@Override public void mouseReleased(MouseEvent e) {}
@Override public void mouseEntered(MouseEvent e) {}
@Override public void mouseExited(MouseEvent e) {}
}
class browserSelectionListener implements MouseListener
{
@Override public void mouseClicked(MouseEvent e)
{
if(e.getClickCount() == 2)
{
String selection = ui_view.getBrowserList().getSelectedValue().toString();
ui_model.removeFromList(selection);
ui_view.getBrowserList().setModel(ui_model.getSelectedModules());
}
}
@Override public void mousePressed(MouseEvent e) {}
@Override public void mouseReleased(MouseEvent e) {}
@Override public void mouseEntered(MouseEvent e) {}
@Override public void mouseExited(MouseEvent e) {}
}
class modulesSelectionListener implements MouseListener
{
@Override public void mouseClicked(MouseEvent e)
{
if(e.getClickCount() == 2 && ui_model.getSelectionInfo() != null)
{
String output = ui_view.getModuleTree().getLastSelectedPathComponent().toString();
ui_model.addToList(output);
ui_view.getBrowserList().setModel(ui_model.getSelectedModules());
}
}
@Override public void mousePressed(MouseEvent e) {}
@Override public void mouseReleased(MouseEvent e) {}
@Override public void mouseEntered(MouseEvent e) {}
@Override public void mouseExited(MouseEvent e) {}
}
class towerSelectionListener implements ActionListener
{
@Override public void actionPerformed(ActionEvent e)
{
String output = ui_view.getTowers().getSelectedItem().toString();
if(ui_model.getSelectionInfo() == null)
{
if(ui_model.validateTower(output))
{
ui_model.setSelectionInfo(output);
ui_view.getTowerNameLabel().setText(ui_model.getSelectionInfo());
}
} else {
JFrame dialog = new JFrame();
JOptionPane.showMessageDialog(dialog, "There is a already selected tower: "
+ ui_model.getSelectionInfo(), "Cannot select a new tower !",
JOptionPane.WARNING_MESSAGE);
}
}
}
}下面是我的UI模型：
package env.model;
import javax.swing.*;
public class UI_Model
{
private String is_tower_selected = null;
private DefaultListModel selected_modules = new DefaultListModel();
private int module_counter = 0;
private final String reset_tower_name = "No tower selected";
private int shield = 0;
private int armor = 0;
private double em = 0.0;
private double th = 0.0;
private double kn = 0.0;
private double ex = 0.0;
public String reset_label()
{
return this.reset_tower_name;
}
public int getModulesCounter()
{
return this.module_counter;
}
public UI_Model()
{
}
public DefaultListModel getSelectedModules()
{
return this.selected_modules;
}
public void removeFromList(String input)
{
this.selected_modules.removeElement(input);
this.module_counter -= 1;
}
public void addToList(String output)
{
if(validateInput(output) == true)
{
this.selected_modules.addElement(" " + output);
this.module_counter += 1;
}
}
public String getSelectionInfo()
{
return this.is_tower_selected;
}
public void setSelectionInfo(String tower)
{
this.is_tower_selected = tower;
}
public void retsetSelectionInfo()
{
this.is_tower_selected = null;
}
public void outputSelection(String output)
{
System.out.println(output);
}
public boolean validateTower(String input)
{
if(input.equals("Select a Control Tower "))
{
return false;
}
return true;
}
public boolean validateInput(String input)
{
if(input.contains("<html>") || input.equals("Starbase Modules"))
{
return false;
}
return true;
}
}如果你走了这么远的话，非常感谢：)现在请回答以下问题：
- --我试图在我的视图中实现JProgressBar组件--我已经创建了它的一个实例，但我对实现它的正确方法感到有点困惑，因为随着元素被添加到JList组件中，在最大JProgressBar总量中消耗的部分将被更新。在项目开始时，
- 被告知在我的视图中实现可观察的类，并对我的模型进行观察者。然而，我被告知提供一些当时我没有的代码作为参考。好吧，现在我有了一些代码，但是，我看不出这个观察者/可观察的实现在我的例子中如何帮助我，特别是我的JProgressBar问题。对于实现O/O如何在这段代码中帮助我，我能给出一些建议吗？
- ，由于我不能将BorderFactory.createEmptyBorder应用于JLabel以在
- 上的标签之间设置间隔，所以我使用“right.add(新JLabel(”)，"wrap，span")“在我如何替代它之间创建垂直间隔。是否有预先定义的方法可以设置JPanel元素之间的间隔，或者是否需要引用布局管理器.
？
任何关于修复、更改或替换什么的提示都是受欢迎的--我知道我在这里输入了很多数据，但我正在努力学习这一点，而且我没有其他地方可参考。
回答 2
Stack Overflow用户
回答已采纳
发布于 2012-01-03 02:54:18
我不知道你在这里得到了什么，除非你把它们链接起来，否则它不会更新?如果你在notifyObservers().类上扩展了可观察到的
- ，那么改变addToList()来调用setChanges()，然后调用UI_Model ()
public void addToList(String output)
{
if (validateInput(output) == true)
{
this.selected_modules.addElement(" " + output);
this.module_counter += 1;
setChanged();
notifyObservers();
}
}然后在视图对象上实现观察者，然后将视图作为观察者添加到控制器中的模型中：
public UI_Controller(UI_Model model, UI_View view)
{
ui_model = model;
ui_view = view;
ui_model.addObserver(ui_view);
ui_view.towersBoxListener(new towerSelectionListener());
ui_view.modulesTreeListener(new modulesSelectionListener());
ui_view.browserListListener(new browserSelectionListener());
ui_view.towerLabelListner(new towerRemovalListener());
}从规范和其他各种来源来看，JLabel.setBorder(BorderFactory.createEmptyBorder(...))似乎是
- 应该可以。
Stack Overflow用户
发布于 2012-01-03 02:31:43
你说过
在项目开始时，
被告知在我的视图中实现可观察类，对我的模型执行观察者类。
但对我来说这听起来完全相反。视图最像一个Observer，一个像Observable.这样的模型--也许你弄错了？
另外，查看类MouseAdapter --将其子类化，而不是直接实现MouseListener，将减少大量无用的代码！
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/8707302
复制相关文章
相似问题
腾讯云开发者
