Implement Undo

src/kontakte/controller/CommandInvoker.java

 
 import java.awt.Component;
 import java.util.HashMap;
+import java.util.Stack;
 
 /**
  *
 public class CommandInvoker
 {
   private HashMap<Component, CommandInterface> commands;
+  private Stack<CommandInterface> undoStack;
   
   public CommandInvoker()
   {
     commands = new HashMap<>();
+    undoStack = new Stack<CommandInterface>();
   }
   
   public void addCommand(Component key, CommandInterface value)
   public void executeCommand(Component key)
   {
     commands.get(key).execute();
+    undoStack.add(commands.get(key));
+  }
+  
+  public void undoCommand()
+  {
+    if (!undoStack.empty())
+    {
+      undoStack.pop().undo();
+    }
   }
 }

src/kontakte/controller/CommandNewKontaktCancel.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package kontakte.controller;
+
+import kontakte.model.Model;
+import kontakte.view.View;
+
+/**
+ *
+ * @author nobody
+ */
+public class CommandNewKontaktCancel implements CommandInterface
+{
+  private View view;
+  private Model model;
+  
+  public CommandNewKontaktCancel(View view, Model model)
+  {
+    this.view = view;
+    this.model = model;
+  }
+
+  @Override
+  public void execute()
+  {
+    view.getTextName().setText("");
+    view.getTextCity().setText("");
+    view.getTextStreet().setText("");
+    view.getAddEntryFrame().dispose();
+  }
+
+  @Override
+  public void undo()
+  {
+  }
+}

src/kontakte/controller/CommandNewKontaktOk.java

 
 package kontakte.controller;
 
+import java.util.Map;
+import java.util.Stack;
 import kontakte.model.Kontakt;
 import kontakte.model.Model;
 import kontakte.view.View;
 {
   private View view;
   private Model model;
+  private Stack<Kontakt> undoStack;
   
   public CommandNewKontaktOk(View view, Model model)
   {
     this.view = view;
     this.model = model;
+    view.getAddEntryFrame().pack();
+    undoStack = new Stack<Kontakt>();
   }
 
   @Override
     String name = view.getTextName().getText();
     String wohnort = view.getTextCity().getText();
     String strasse = view.getTextStreet().getText();
+    view.getTextName().setText("");
+    view.getTextCity().setText("");
+    view.getTextStreet().setText("");
     Kontakt neuKon = new Kontakt(name, wohnort, strasse);
     model.addKontakt(neuKon);
-    view.getAddEntryFrame().setVisible(false);
+    undoStack.add(neuKon);
+    redrawTextbox();
+    view.getAddEntryFrame().dispose();
   }
 
   @Override
   public void undo()
   {
+    if(!undoStack.empty())
+    {
+      model.deleteKontakt(undoStack.pop());
+      redrawTextbox();
+    }
+  }
+  
+  private void redrawTextbox()
+  {
+    view.getTxtKontakte().setText("");
+    for (Map.Entry<String, Kontakt> k: model.kontaktliste.entrySet())
+    {
+      view.getTxtKontakte().append(k.getValue().name + " ");
+      view.getTxtKontakte().append(k.getValue().wohnort + " ");
+      view.getTxtKontakte().append(k.getValue().strasse + "\n");
+    }
   }
 }

src/kontakte/controller/Controller.java

     view.getBtnSave().addActionListener(this);
     view.getMenuSave().addActionListener(this);
     view.getBtnNewEntry().addActionListener(this);
+    view.getBtnOk().addActionListener(this);
+    view.getBtnCancel().addActionListener(this);
+    view.getMenuUndo().addActionListener(this);
   }
   
   public void registerCommands()
     invoker.addCommand(view.getBtnSave(), cmdSave);
     invoker.addCommand(view.getMenuSave(), cmdSave);
     invoker.addCommand(view.getBtnNewEntry(), new CommandNewKontaktVisible(view, model));
+    invoker.addCommand(view.getBtnOk(),new CommandNewKontaktOk(view,model));
+    invoker.addCommand(view.getBtnCancel(),new CommandNewKontaktCancel(view,model));
   }
   
   @Override
   public void actionPerformed(ActionEvent e)
   {
     Component key = (Component)e.getSource();
-    invoker.executeCommand(key);
+    if(key != view.getMenuUndo())
+    {
+      invoker.executeCommand(key);
+    }
+    else
+    {
+      invoker.undoCommand();
+    }
   }
   
 }

src/kontakte/view/View.form

                 <Property name="text" type="java.lang.String" value="Delete Entry"/>
               </Properties>
             </MenuItem>
+            <MenuItem class="javax.swing.JMenuItem" name="menuUndo">
+              <Properties>
+                <Property name="accelerator" type="javax.swing.KeyStroke" editor="org.netbeans.modules.form.editors.KeyStrokeEditor">
+                  <KeyStroke key="Ctrl+Z"/>
+                </Property>
+                <Property name="mnemonic" type="int" value="85"/>
+                <Property name="text" type="java.lang.String" value="Undo"/>
+                <Property name="toolTipText" type="java.lang.String" value=""/>
+              </Properties>
+            </MenuItem>
           </SubComponents>
         </Menu>
       </SubComponents>
 
       <Layout class="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout"/>
       <SubComponents>
-        <Container class="javax.swing.JScrollPane" name="jScrollPane1">
-          <AuxValues>
-            <AuxValue name="autoScrollPane" type="java.lang.Boolean" value="true"/>
-          </AuxValues>
-          <Constraints>
-            <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
-              <BorderConstraints direction="Center"/>
-            </Constraint>
-          </Constraints>
-
-          <Layout class="org.netbeans.modules.form.compat2.layouts.support.JScrollPaneSupportLayout"/>
-          <SubComponents>
-            <Component class="javax.swing.JTable" name="tableContacts">
-              <Properties>
-                <Property name="model" type="javax.swing.table.TableModel" editor="org.netbeans.modules.form.editors2.TableModelEditor">
-                  <Table columnCount="4" rowCount="4">
-                    <Column editable="true" title="Title 1" type="java.lang.Object"/>
-                    <Column editable="true" title="Title 2" type="java.lang.Object"/>
-                    <Column editable="true" title="Title 3" type="java.lang.Object"/>
-                    <Column editable="true" title="Title 4" type="java.lang.Object"/>
-                  </Table>
-                </Property>
-              </Properties>
-            </Component>
-          </SubComponents>
-        </Container>
         <Container class="javax.swing.JLayeredPane" name="jLayeredPane2">
           <Constraints>
             <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
             </Component>
           </SubComponents>
         </Container>
+        <Container class="javax.swing.JScrollPane" name="jScrollPane2">
+          <AuxValues>
+            <AuxValue name="autoScrollPane" type="java.lang.Boolean" value="true"/>
+          </AuxValues>
+          <Constraints>
+            <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
+              <BorderConstraints direction="Center"/>
+            </Constraint>
+          </Constraints>
+
+          <Layout class="org.netbeans.modules.form.compat2.layouts.support.JScrollPaneSupportLayout"/>
+          <SubComponents>
+            <Component class="javax.swing.JTextArea" name="txtKontakte">
+              <Properties>
+                <Property name="columns" type="int" value="20"/>
+                <Property name="rows" type="int" value="5"/>
+              </Properties>
+            </Component>
+          </SubComponents>
+        </Container>
       </SubComponents>
     </Container>
   </SubComponents>

src/kontakte/view/View.java

     return menuSave;
   }
 
-  /**
-   * @return the tableContacts
-   */
-  public javax.swing.JTable getTableContacts()
-  {
-    return tableContacts;
-  }
-
   /**
    * @return the textCity
    */
     btnClose = new javax.swing.JButton();
     textFileAdress = new javax.swing.JTextField();
     jLayeredPane1 = new javax.swing.JLayeredPane();
-    jScrollPane1 = new javax.swing.JScrollPane();
-    tableContacts = new javax.swing.JTable();
     jLayeredPane2 = new javax.swing.JLayeredPane();
     btnNewEntry = new javax.swing.JButton();
     jButton2 = new javax.swing.JButton();
     jLayeredPane3 = new javax.swing.JLayeredPane();
     textFindTip = new javax.swing.JTextField();
     textFind = new javax.swing.JTextField();
+    jScrollPane2 = new javax.swing.JScrollPane();
+    txtKontakte = new javax.swing.JTextArea();
     jMenuBar1 = new javax.swing.JMenuBar();
     menuFile = new javax.swing.JMenu();
     menuOpen = new javax.swing.JMenuItem();
     menuEdit = new javax.swing.JMenu();
     menuAddEntry = new javax.swing.JMenuItem();
     menuDeleteEntry = new javax.swing.JMenuItem();
+    menuUndo = new javax.swing.JMenuItem();
 
     addEntryFrame.getContentPane().setLayout(new javax.swing.BoxLayout(addEntryFrame.getContentPane(), javax.swing.BoxLayout.Y_AXIS));
 
 
     jLayeredPane1.setLayout(new java.awt.BorderLayout());
 
-    tableContacts.setModel(new javax.swing.table.DefaultTableModel(
-      new Object [][]
-      {
-        {null, null, null, null},
-        {null, null, null, null},
-        {null, null, null, null},
-        {null, null, null, null}
-      },
-      new String []
-      {
-        "Title 1", "Title 2", "Title 3", "Title 4"
-      }
-    ));
-    jScrollPane1.setViewportView(tableContacts);
-
-    jLayeredPane1.add(jScrollPane1, java.awt.BorderLayout.CENTER);
-
     jLayeredPane2.setLayout(new java.awt.FlowLayout());
 
     btnNewEntry.setIcon(new javax.swing.ImageIcon(getClass().getResource("/kontakte/view/img/Add24.gif"))); // NOI18N
 
     jLayeredPane1.add(jLayeredPane3, java.awt.BorderLayout.PAGE_START);
 
+    txtKontakte.setColumns(20);
+    txtKontakte.setRows(5);
+    jScrollPane2.setViewportView(txtKontakte);
+
+    jLayeredPane1.add(jScrollPane2, java.awt.BorderLayout.CENTER);
+
     getContentPane().add(jLayeredPane1, java.awt.BorderLayout.CENTER);
 
     menuFile.setMnemonic('F');
     menuDeleteEntry.setText("Delete Entry");
     menuEdit.add(menuDeleteEntry);
 
+    menuUndo.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_Z, java.awt.event.InputEvent.CTRL_MASK));
+    menuUndo.setMnemonic('U');
+    menuUndo.setText("Undo");
+    menuUndo.setToolTipText("");
+    menuEdit.add(menuUndo);
+
     jMenuBar1.add(menuEdit);
 
     setJMenuBar(jMenuBar1);
   private javax.swing.JLayeredPane jLayeredPane7;
   private javax.swing.JLayeredPane jLayeredPane8;
   private javax.swing.JMenuBar jMenuBar1;
-  private javax.swing.JScrollPane jScrollPane1;
+  private javax.swing.JScrollPane jScrollPane2;
   private javax.swing.JTextField jTextField1;
   private javax.swing.JTextField jTextField3;
   private javax.swing.JTextField jTextField5;
   private javax.swing.JMenu menuFile;
   private javax.swing.JMenuItem menuOpen;
   private javax.swing.JMenuItem menuSave;
-  private javax.swing.JTable tableContacts;
+  private javax.swing.JMenuItem menuUndo;
   private javax.swing.JTextField textCity;
   private javax.swing.JTextField textFileAdress;
   private javax.swing.JTextField textFind;
   private javax.swing.JTextField textFindTip;
   private javax.swing.JTextField textName;
   private javax.swing.JTextField textStreet;
+  private javax.swing.JTextArea txtKontakte;
   // End of variables declaration//GEN-END:variables
+
+  /**
+   * @return the txtKontakte
+   */
+  public javax.swing.JTextArea getTxtKontakte()
+  {
+    return txtKontakte;
+  }
+
+  /**
+   * @return the menuUndo
+   */
+  public javax.swing.JMenuItem getMenuUndo()
+  {
+    return menuUndo;
+  }
 }