menucolor.java

用java编制的记事本

//MenuColor version 1.0 alpha1
//09/13/2001
//author [e-mail]

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class MenuColor extends JDialog
                       implements ItemListener,
                                  ActionListener,
                                  TextListener,
                                  AdjustmentListener {

  CheckboxGroup gp;
  Checkbox fore, back;
  Scrollbar scrollbarRed, scrollbarGreen, scrollbarBlue;
  TextField textFieldRed, textFieldGreen, textFieldBlue;
  Button colorButtonOk, colorButtonCancel;
  Checkbox colorCheckbox;
  JTextField colorTextField;
  Color[] fbgc = new Color[2];
  Color[] fbgcOld = new Color[2];

  boolean changed = true;
  boolean synchronism = false;
  boolean isFore = true;

  MenuColor(Frame frame, boolean modal) {
    super(frame, modal);
  }

  public Color[] myLayout(Color fgc, Color bgc) {
    fbgc[0] = fgc;
    fbgc[1] = bgc;
    fbgcOld[0] = fgc;
    fbgcOld[1] = bgc;
    this.getContentPane().setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridwidth = 1;
    gbc.gridheight =1;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.fill = gbc.HORIZONTAL;
    gbc.anchor = gbc.CENTER;

    //CheckboxGroup for fore and back ground
    gp = new CheckboxGroup();
    fore = new Checkbox("前景色", true, gp);
    back = new Checkbox("背景色", false, gp);
    gbc.gridx = 1;
    gbc.gridy = 0;
    getContentPane().add(fore, gbc);
    gbc.gridx = 3;
    gbc.gridy = 0;
    getContentPane().add(back, gbc);
    fore.addItemListener(this);
    back.addItemListener(this);

    // 3 groups of Label + ScrollBar + TextField
    Label labelRed = new Label("红色");
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.fill = gbc.NONE;
    getContentPane().add(labelRed, gbc);
    scrollbarRed = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 256);
    scrollbarRed.setValue(fgc.getRed());
    gbc.gridx = 1;
    gbc.gridy = 1;
    gbc.fill = gbc.HORIZONTAL;
    getContentPane().add(scrollbarRed, gbc);
    scrollbarRed.addAdjustmentListener(this);
    textFieldRed = new TextField(1);
    textFieldRed.setText(scrollbarRed.getValue() + "");
    textFieldRed.addTextListener(this);
    //textFieldRed.setEditable(false);
    gbc.gridx = 2;
    gbc.gridy = 1;
    gbc.fill = gbc.NONE;
    getContentPane().add(textFieldRed, gbc);

    Label labelGreen = new Label("绿色");
    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.fill = gbc.NONE;
    getContentPane().add(labelGreen, gbc);
    scrollbarGreen = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 256);
    scrollbarGreen.setValue(fgc.getGreen());
    gbc.gridx = 1;
    gbc.gridy = 2;
    gbc.fill = gbc.HORIZONTAL;
    getContentPane().add(scrollbarGreen, gbc);
    scrollbarGreen.addAdjustmentListener(this);
    textFieldGreen = new TextField(1);
    textFieldGreen.setText(scrollbarGreen.getValue() + "");
    //textFieldGreen.addTextListener(this);
    textFieldGreen.setEditable(false);
    gbc.gridx = 2;
    gbc.gridy = 2;
    gbc.fill = gbc.NONE;
    getContentPane().add(textFieldGreen, gbc);

    Label labelBlue = new Label("蓝色");
    gbc.fill = gbc.NONE;
    gbc.gridx = 0;
    gbc.gridy = 3;
    getContentPane().add(labelBlue, gbc);
    scrollbarBlue = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 256);
    scrollbarBlue.setValue(fgc.getBlue());
    gbc.gridx = 1;
    gbc.gridy = 3;
    gbc.fill = gbc.HORIZONTAL;
    getContentPane().add(scrollbarBlue, gbc);
    scrollbarBlue.addAdjustmentListener(this);
    textFieldBlue = new TextField(1);
    textFieldBlue.setText(scrollbarBlue.getValue() + "");
    //textFieldBlue.addTextListener(this);
    textFieldBlue.setEditable(false);
    gbc.gridx = 2;
    gbc.gridy = 3;
    gbc.fill = gbc.NONE;
    getContentPane().add(textFieldBlue, gbc);

    //2 Buttons: Ok and Cancel
    colorButtonOk = new Button("    确定    ");
    gbc.gridx = 4;
    gbc.gridy = 1;
    gbc.fill = gbc.NONE;
    getContentPane().add(colorButtonOk,gbc);
    colorButtonOk.addActionListener(this);

    colorButtonCancel = new Button("取消");
    gbc.gridx = 4;
    gbc.gridy = 2;
    getContentPane().add(colorButtonCancel,gbc);
    colorButtonCancel.addActionListener(this);

    //a Checkbox for locking RGB Scrollbar to synchronize
    colorCheckbox = new Checkbox("Lock RGB", false);
    gbc.gridx = 3;
    gbc.gridy = 3;
    getContentPane().add(colorCheckbox,gbc);
    colorCheckbox.addItemListener(this);

    //a TextField for demo the color
    colorTextField = new JTextField("画图");
    //for user who intends to use pure AWT
    //have to change colorTextField from TextField class to JTextField
    //in order to avoid  the 70% decrease in color
    //when setEditable(false) and color neet to be corrected
    //by increasing 1/(70%) since >255 some case
    //need todo... maybe depend on os and jre version.
    colorTextField.setEditable(false);
    colorTextField.setSize(90, 60);
    colorTextField.setForeground(fgc);
    colorTextField.setBackground(bgc);
    colorTextField.setFont(new Font("Courier", Font.BOLD + Font.ITALIC, 36));
    gbc.gridx = 3;
    gbc.gridy = 1;
    gbc.gridwidth = 1;
    gbc.gridheight =2;
    gbc.fill = gbc.BOTH;
    //gbc.fill = gbc.HORIZONTAL;
    getContentPane().add(colorTextField, gbc);

    this.addWindowListener(new WindowAdapter() {
                             public void windowClosing(WindowEvent e) {
                               dispose();
                             }
                           });
    this.setLocation(120, 120);
    this.setResizable(false);
    this.setSize(480,160);
    this.setVisible(true);
    if(changed) {
      return fbgc;
    }
    else
      return fbgcOld;
  }//end of myLayout

  //ActionListener
  public void actionPerformed(ActionEvent ae) {
    if(ae.getSource() == colorButtonOk) {
      changed = true;
      dispose();
    }
    else if(ae.getSource() == colorButtonCancel) {
      changed = false;
      dispose();
    }
  }//end of ActionListener

  //ItemListener
  public void itemStateChanged(ItemEvent ie) {
    if(ie.getSource() == fore) {
      isFore = true;
      scrollbarRed.setValue(fbgc[0].getRed());
      textFieldRed.setText(scrollbarRed.getValue() + "");
      scrollbarGreen.setValue(fbgc[0].getGreen());
      textFieldGreen.setText(scrollbarGreen.getValue() + "");
      scrollbarBlue.setValue(fbgc[0].getBlue());
      textFieldBlue.setText(scrollbarBlue.getValue() + "");
      colorTextField.setForeground(setColorVarSrollbar());
    }
    else if(ie.getSource() == back) {
      isFore = false;
      scrollbarRed.setValue(fbgc[1].getRed());
      textFieldRed.setText(scrollbarRed.getValue() + "");
      scrollbarGreen.setValue(fbgc[1].getGreen());
      textFieldGreen.setText(scrollbarGreen.getValue() + "");
      scrollbarBlue.setValue(fbgc[1].getBlue());
      textFieldBlue.setText(scrollbarBlue.getValue() + "");
      colorTextField.setBackground(setColorVarSrollbar());
    }
    else if(ie.getSource() == colorCheckbox) {
      if(colorCheckbox.getState()) {
        synchronism = true;
      }
      else {
        synchronism = false;
      }
    }
  }//end of ItemListener

  //AdjustmentListener
  public void adjustmentValueChanged(AdjustmentEvent ade) {
    if(ade.getSource() == scrollbarRed) {
      if(synchronism) {
        textFieldRed.setText(scrollbarRed.getValue() + "");
        scrollbarGreen.setValue(scrollbarRed.getValue());
        textFieldGreen.setText(scrollbarRed.getValue() + "");
        scrollbarBlue.setValue(scrollbarRed.getValue());
        textFieldBlue.setText(scrollbarRed.getValue() + "");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
      else {
        textFieldRed.setText(scrollbarRed.getValue()+"");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
    }
    else if(ade.getSource() == scrollbarGreen) {
      if(synchronism) {
        textFieldGreen.setText(scrollbarGreen.getValue() + "");
        scrollbarBlue.setValue(scrollbarGreen.getValue());
        textFieldBlue.setText(scrollbarGreen.getValue() + "");
        scrollbarRed.setValue(scrollbarGreen.getValue());
        textFieldRed.setText(scrollbarGreen.getValue() + "");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
      else {
          textFieldGreen.setText(scrollbarGreen.getValue() + "");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
    }
    else if(ade.getSource() == scrollbarBlue) {
      if(synchronism) {
        textFieldBlue.setText(scrollbarBlue.getValue() + "");
        scrollbarRed.setValue(scrollbarBlue.getValue());
        textFieldRed.setText(scrollbarBlue.getValue() + "");
        scrollbarGreen.setValue(scrollbarBlue.getValue());
        textFieldGreen.setText(scrollbarBlue.getValue() + "");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
      else {
        textFieldBlue.setText(scrollbarBlue.getValue() + "");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
    }
  }//end of AdjustmentListener

  //TextListener
  public void textValueChanged(TextEvent te) {
    if(te.getSource() == textFieldRed) {
      int i = 0;
      try {
        i = Integer.parseInt(textFieldRed.getText());
      } catch(NumberFormatException nfe) {
      }
      if(i < 0)
        i = 0;
      if(i > 255)
        i = 255;
      scrollbarRed.setValue(i);
      if(synchronism) {
        scrollbarGreen.setValue(scrollbarRed.getValue());
        textFieldGreen.setText(scrollbarRed.getValue() + "");
        scrollbarBlue.setValue(scrollbarRed.getValue());
        textFieldBlue.setText(scrollbarRed.getValue() + "");
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }
      else {
        if(isFore) {
          colorTextField.setForeground(setColorVarSrollbar());
          fbgc[0] = setColorVarSrollbar();
        }
        else {
          colorTextField.setBackground(setColorVarSrollbar());
          fbgc[1] = setColorVarSrollbar();
        }
      }

    }
    //conflicts with textFieldRed, because of TextListener::textValueChanged()
    //neet todo..
    //else if(te.getSource() == textFieldGreen) {
    //}
    //else if(te.getSource() == textFieldBlue) {
    //}
  }//end of TextListener

  private Color setColorVarSrollbar() {
   return new Color(scrollbarRed.getValue(),
                    scrollbarGreen.getValue(),
                    scrollbarBlue.getValue());
  }

  public static void main(String[] args) {
    JFrame jfr = new JFrame();
    final JTextArea ta = new JTextArea(10,10);
    jfr.getContentPane().add("Center", ta);
    JButton jb = new JButton("SetColor");
    jfr.getContentPane().add("South", jb);
    jb.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        MenuColor mc = new MenuColor(null, true);
        Color[]  fbgc = new Color[2];
        fbgc = mc.myLayout(ta.getForeground(), ta.getBackground());
        ta.setForeground(fbgc[0]);
        ta.setBackground(fbgc[1]);
        ta.setCaretColor(fbgc[0]);
      }
    });
    jfr.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    jfr.setSize(320,240);
    jfr.show();
  }

}//end of class MenuColor