2013-10-14 10:09:49Morris
[JAVA] 繪圖選單
繪圖選單可能有數個欄位，而所有欄位中，頂多有一個功能被選擇。
由於目前欄位只有一組，因此可能還看不太出來。
設計的思路為 :
MainFrame 下套用 MainPanel 整個，之所以多使用 JPanel class 是因為從旗下 add() 的 component 可以用 getParent() 得到， JFrame class 是沒有辦法調用到。
而 MainPanel 又分成數個區域，如圖所示，左區為工具列，右區為繪圖區 PaintPanel。
PaintPanel 利用 getParent() 呼叫 MainPanel 的 function 得到左區工具列哪一個功能被選擇。
到時候有多個工具列時，才方便修改。
由於選單至多一個被選擇，採用 JList 形式去修改，要將選擇事件稍微修改一下達到美觀。
從讀圖檔的方式改變，以及選擇框架的取消。當然也可以使用 JMenuItem 套用 ButtonGroup 之類的方式。不敢怎樣，到時候去修改 function 即可。
需要整包 project 留言。
package package1;
import java.awt.*;
import javax.swing.*;
public class MainFrame extends JFrame {
private static int WIDTH = 1000, HEIGHT = 500;
private DefaultListModel listModel;
private JList sampleJList;
MainFrame() {
this.setTitle("ButtonGroupObject");
this.setSize(WIDTH, HEIGHT);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(new MainPanel());
this.setVisible(true);
}
public static void main(String[] args) {
new MainFrame();
}
}
package package1;
import java.awt.*;
import javax.swing.*;
public class MainPanel extends JPanel {
private static int WIDTH = 1000, HEIGHT = 500;
private DefaultListModel listModel;
private JList sampleJList;
MainPanel() {
this.setLayout(new GridBagLayout());
listModel = new DefaultListModel();
listModel.addElement("Select");
listModel.addElement("Class");
listModel.addElement("Association");
sampleJList = new JList(listModel);
sampleJList.setCellRenderer(new MRenderer());
sampleJList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
sampleJList.setSelectionBackground(null);
sampleJList.setBackground(new Color(240, 240, 240));
Font displayFont = new Font("Serif", Font.BOLD, 35);
sampleJList.setFont(displayFont);
sampleJList.setSelectedIndex(0);
PaintPanel samplePanel = new PaintPanel();
GridBagConstraints GBC = new GridBagConstraints();
GBC.insets = new Insets(10, 10, 10, 10);
GBC.fill = GridBagConstraints.HORIZONTAL;
GBC.anchor = GridBagConstraints.NORTHEAST;
GBC.gridx = 0;
GBC.gridy = 0;
GBC.gridwidth = 1;
GBC.gridheight = 3;
GBC.weightx = 30;
GBC.weighty = 30;
this.add(sampleJList, GBC);
GBC = new GridBagConstraints();
GBC.insets = new Insets(10, 10, 10, 10);
GBC.fill = GridBagConstraints.BOTH;
GBC.anchor = GridBagConstraints.NORTHEAST;
GBC.gridx = 1;
GBC.gridy = 1;
GBC.gridwidth = 3;
GBC.gridheight = 3;
GBC.weightx = 300;
GBC.weighty = 150;
this.add(samplePanel, GBC);
}
public String getToolsSelected() {
int idx = sampleJList.getSelectedIndex();
return listModel.get(idx).toString();
}
}
package package1;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class MRenderer extends DefaultListCellRenderer {
private Hashtable iconTable = new Hashtable();
public Component getListCellRendererComponent(JList list,
Object value,
int index,
boolean isSelected,
boolean hasFocus) {
JLabel label =
(JLabel)super.getListCellRendererComponent(list,
value.toString(),// display non-text.
index,
isSelected,
false);
ImageIcon icon = (ImageIcon)iconTable.get(value.toString()+isSelected);
if(icon == null) {
String fileName = value.toString();
if(isSelected == true)
fileName += "1.png";
else
fileName += "0.png";
icon = new ImageIcon(fileName);
iconTable.put(value.toString()+isSelected, icon);
}
label.setIcon(icon);
return label;
}
}
package package1;
import java.awt.*;
import javax.swing.*;
public class PaintPanel extends JPanel {
PaintPanel() {
this.setBackground(new Color(40, 40, 40));
ShowListener listener = new ShowListener();
this.addMouseListener(listener);
this.addMouseMotionListener(listener);
}
public String getToolsSelected() {
Component j1 = this.getParent();
if(j1 instanceof MainPanel)
return ((MainPanel) j1).getToolsSelected();
else
return null;
}
}
package package1;
import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseEvent;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javax.swing.event.MouseInputListener;
public class ShowListener implements MouseInputListener{
public void mouseMoved(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
Component j1 = (Component) e.getSource();//jl = PaintPanel
JOptionPane.showMessageDialog(j1, ((PaintPanel)j1).getToolsSelected());
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
}