Java AWT组件综合练习

package MainEntrancy; import java.awt.BorderLayout; import java.awt.Button; import java.awt.Checkbox; import java.awt.Choice; import java.awt.Color; import java.awt.GridLayout; import java.awt.List; import java.awt.Panel; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; public class LeftPanel extends Panel { private static final long serialVersionUID = -3621170320398050677L; BorderLayout borderLayout = null; Panel topPanel = null; GridLayout gridLayout = null; Choice choice = null; List list = null; Button butAdd = null; TextField textField = null; Panel botPanel = null; MyCanvas canvas = null; Checkbox checkbox = null; public LeftPanel() { this.setBackground(Color.CYAN); borderLayout = new BorderLayout(5,5); this.setLayout(borderLayout); Init(); this.add(topPanel, BorderLayout.NORTH); this.add(botPanel, BorderLayout.SOUTH); } private void Init(){ topPanel = new Panel(); gridLayout = new GridLayout(0, 2); topPanel.setLayout(gridLayout); SetTopPanelComponent(); SetBotPanelComponent(); } private void SetTopPanelComponent(){ choice = new Choice(); choice.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent arg0) { // TODO Auto-generated method stub String str2 = arg0.getItem().toString(); if(str2.equals("河南")){ list.removeAll(); list.add("郑州"); list.add("濮阳"); list.add("南阳"); list.add("安阳"); list.add("洛阳"); list.add("商丘"); } else if(str2.equals("山东")){ list.removeAll(); list.add("济南"); list.add("青岛"); list.add("东营"); list.add("德州"); list.add("威海"); list.add("烟台"); list.add("日照"); list.add("泰安"); list.add("淄博"); } } }); choice.add("山东"); choice.add("河南"); list = new List(5); list.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent arg0) { // TODO Auto-generated method stub String str = arg0.getItem().toString(); System.out.println(str); str = list.getSelectedItem(); System.out.println(str); canvas.strPrint = str; boolean blSel = checkbox.getState(); if(blSel) canvas.blDraw = true; else canvas.blDraw = false; canvas.repaint(); } }); list.add("济南"); list.add("青岛"); list.add("东营"); list.add("德州"); list.add("威海"); list.add("烟台"); list.add("日照"); list.add("泰安"); list.add("淄博"); butAdd = new Button("添加"); butAdd.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub String str = textField.getText(); list.add(str); int i = list.getItemCount(); list.select(i - 1); } }); textField = new TextField(); topPanel.add(choice); topPanel.add(list); topPanel.add(butAdd); topPanel.add(textField); } private void SetBotPanelComponent(){ botPanel = new Panel(new BorderLayout()); canvas = new MyCanvas(); canvas.addMouseMotionListener(new MouseMotionListener() { @Override public void mouseMoved(MouseEvent arg0) { // TODO Auto-generated method stub if(canvas.blDraw){ canvas.x = arg0.getX(); canvas.y = arg0.getY(); canvas.strPrint = String.valueOf(canvas.x) + ", " + String.valueOf(canvas.y); canvas.repaint(); } } @Override public void mouseDragged(MouseEvent arg0) { // TODO Auto-generated method stub } }); botPanel.add(canvas, BorderLayout.CENTER); checkbox = new Checkbox("是否绘制"); checkbox.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent arg0) { // TODO Auto-generated method stub int iSel = arg0.getStateChange(); // 1:选中；2：未选中 if(iSel == 1){ canvas.blDraw = true; canvas.repaint(); } else { canvas.blDraw = false; canvas.repaint(); } } }); botPanel.add(checkbox, BorderLayout.PAGE_END); } }