menucolor.java

Java编写的记事本程序,对学习Java桌面编程的朋友可能会有帮助!

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;

	TextField colorTextField;

	boolean changed = true;

	boolean synchronism = false;

	Color[] fbgc = new Color[2];

	Color[] fbgcOld = new Color[2];

	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("Foreground", true, gp);
		back = new Checkbox("Background", 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("Red");
		gbc.gridx = 0;
		gbc.gridy = 1;
		getContentPane().add(labelRed, gbc);
		scrollbarRed = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 256);
		scrollbarRed.setValue(fgc.getRed());
		gbc.gridx = 1;
		gbc.gridy = 1;
		getContentPane().add(scrollbarRed, gbc);
		scrollbarRed.addAdjustmentListener(this);
		textFieldRed = new TextField(3);
		textFieldRed.setText(scrollbarRed.getValue() + "");
		textFieldRed.addTextListener(this);
		// textFieldRed.setEditable(false);
		gbc.gridx = 2;
		gbc.gridy = 1;
		getContentPane().add(textFieldRed, gbc);

		Label labelGreen = new Label("Green");
		gbc.gridx = 0;
		gbc.gridy = 2;
		getContentPane().add(labelGreen, gbc);
		scrollbarGreen = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 256);
		scrollbarGreen.setValue(fgc.getGreen());
		gbc.gridx = 1;
		gbc.gridy = 2;
		getContentPane().add(scrollbarGreen, gbc);
		scrollbarGreen.addAdjustmentListener(this);
		textFieldGreen = new TextField(3);
		textFieldGreen.setText(scrollbarGreen.getValue() + "");
		// textFieldGreen.addTextListener(this);
		textFieldGreen.setEditable(false);
		gbc.gridx = 2;
		gbc.gridy = 2;
		getContentPane().add(textFieldGreen, gbc);

		Label labelBlue = new Label("Blue");
		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;
		getContentPane().add(scrollbarBlue, gbc);
		scrollbarBlue.addAdjustmentListener(this);
		textFieldBlue = new TextField(3);
		textFieldBlue.setText(scrollbarBlue.getValue() + "");
		// textFieldBlue.addTextListener(this);
		textFieldBlue.setEditable(false);
		gbc.gridx = 2;
		gbc.gridy = 3;
		getContentPane().add(textFieldBlue, gbc);

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

		colorButtonCancel = new Button("Cancel");
		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 TextField("Java awt");
		// have to disable this because of 70% decrease in color when
		// setEditable(false)
		// and color can′t be corrected by increasing 1/(70%) since >255
		// 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.fill = gbc.BOTH;
		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();
				}
			}

		}
		// else if(te.getSource() == textFieldGreen) {
		// } conflict with textFieldRed
		// else if(te.getSource() == textFieldBlue) {
		// }
	}// end of TextListener

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

}// end of class MenuColor