com.scudata.ide.common.swing.TristateCheckBox Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of esproc Show documentation
Show all versions of esproc Show documentation
SPL(Structured Process Language) A programming language specially for structured data computing.
package com.scudata.ide.common.swing;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.Icon;
import javax.swing.JCheckBox;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.ActionMapUIResource;
/**
* Maintenance tip - There were some tricks to getting this code working:
*
* 1. You have to overwite addMouseListener() to do nothing 2. You have to add a
* mouse event on mousePressed by calling super.addMouseListener() 3. You have
* to replace the UIActionMap for the keyboard event "pressed" with your own
* one. 4. You have to remove the UIActionMap for the keyboard event "released".
* 5. You have to grab focus when the next state is entered, otherwise clicking
* on the component won't get the focus. 6. You have to make a TristateDecorator
* as a button model that wraps the original button model and does state
* management.
*/
public class TristateCheckBox extends JCheckBox {
private static final long serialVersionUID = 1L;
/** This is a type-safe enumerated type */
public static class State {
private State() {
}
}
/** δѡ??״̬ */
public static final State NOT_SELECTED = new State();
/** ѡ??״̬ */
public static final State SELECTED = new State();
/** ????̬ */
public static final State DONT_CARE = new State();
/**
* ģ??
*/
private final TristateDecorator model;
/**
* ???캯??
*/
public TristateCheckBox() {
this(null);
}
/**
* ???캯??
*
* @param text
* ??ʾ?ı?
*/
public TristateCheckBox(String text) {
this(text, DONT_CARE);
}
/**
* ???캯??
*
* @param text
* ??ʾ?ı?
* @param initial
* ??ʼ??״̬
*/
public TristateCheckBox(String text, State initial) {
this(text, null, initial);
}
/**
* ???캯??
*
* @param text
* ??ʾ?ı?
* @param icon
* ͼ??
* @param initial
* ??ʼ??״̬
*/
public TristateCheckBox(String text, Icon icon, State initial) {
super(text, icon);
// Add a listener for when the mouse is pressed
super.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
grabFocus();
model.nextState();
}
});
// Reset the keyboard action map
ActionMap map = new ActionMapUIResource();
map.put("pressed", new AbstractAction() {
private static final long serialVersionUID = 1L;
public void actionPerformed(ActionEvent e) {
grabFocus();
model.nextState();
}
});
map.put("released", null);
SwingUtilities.replaceUIActionMap(this, map);
// set the model to the adapted model
model = new TristateDecorator(getModel());
setModel(model);
setState(initial);
}
/** No one may add mouse listeners, not even Swing! */
public void addMouseListener(MouseListener l) {
}
/**
* Set the new state to either SELECTED, NOT_SELECTED or DONT_CARE. If state
* == null, it is treated as DONT_CARE.
*/
public void setState(State state) {
model.setState(state);
}
/**
* Return the current state, which is determined by the selection status of
* the model.
*/
public State getState() {
return model.getState();
}
/**
* ?????Ƿ?ѡ??
*/
public void setSelected(boolean b) {
if (b) {
setState(SELECTED);
} else {
setState(NOT_SELECTED);
}
}
/**
* Exactly which Design Pattern is this? Is it an Adapter, a Proxy or a
* Decorator? In this case, my vote lies with the Decorator, because we are
* extending functionality and "decorating" the original model with a more
* powerful model.
*/
private class TristateDecorator implements ButtonModel {
private final ButtonModel other;
private TristateDecorator(ButtonModel other) {
this.other = other;
}
private void setState(State state) {
if (state == NOT_SELECTED) {
other.setArmed(false);
setPressed(false);
setSelected(false);
} else if (state == SELECTED) {
other.setArmed(false);
setPressed(false);
setSelected(true);
} else { // either "null" or DONT_CARE
other.setArmed(true);
setPressed(true);
setSelected(true);
}
}
/**
* The current state is embedded in the selection / armed state of the
* model.
*
* We return the SELECTED state when the checkbox is selected but not
* armed, DONT_CARE state when the checkbox is selected and armed (grey)
* and NOT_SELECTED when the checkbox is deselected.
*/
private State getState() {
if (isSelected() && !isArmed()) {
// normal black tick
return SELECTED;
} else if (isSelected() && isArmed()) {
// don't care grey tick
return DONT_CARE;
} else {
// normal deselected
return NOT_SELECTED;
}
}
/** We rotate between NOT_SELECTED, SELECTED and DONT_CARE. */
private void nextState() {
State current = getState();
if (current == NOT_SELECTED) {
setState(SELECTED);
} else if (current == SELECTED) {
setState(DONT_CARE);
} else if (current == DONT_CARE) {
setState(NOT_SELECTED);
}
}
/** Filter: No one may change the armed status except us. */
public void setArmed(boolean b) {
}
/**
* We disable focusing on the component when it is not enabled.
*/
public void setEnabled(boolean b) {
setFocusable(b);
other.setEnabled(b);
}
/**
* All these methods simply delegate to the "other" model that is being
* decorated.
*/
public boolean isArmed() {
return other.isArmed();
}
public boolean isSelected() {
return other.isSelected();
}
public boolean isEnabled() {
return other.isEnabled();
}
public boolean isPressed() {
return other.isPressed();
}
public boolean isRollover() {
return other.isRollover();
}
public void setSelected(boolean b) {
other.setSelected(b);
}
public void setPressed(boolean b) {
other.setPressed(b);
}
public void setRollover(boolean b) {
other.setRollover(b);
}
public void setMnemonic(int key) {
other.setMnemonic(key);
}
public int getMnemonic() {
return other.getMnemonic();
}
public void setActionCommand(String s) {
other.setActionCommand(s);
}
public String getActionCommand() {
return other.getActionCommand();
}
public void setGroup(ButtonGroup group) {
other.setGroup(group);
}
public void addActionListener(ActionListener l) {
other.addActionListener(l);
}
public void removeActionListener(ActionListener l) {
other.removeActionListener(l);
}
public void addItemListener(ItemListener l) {
other.addItemListener(l);
}
public void removeItemListener(ItemListener l) {
other.removeItemListener(l);
}
public void addChangeListener(ChangeListener l) {
other.addChangeListener(l);
}
public void removeChangeListener(ChangeListener l) {
other.removeChangeListener(l);
}
public Object[] getSelectedObjects() {
return other.getSelectedObjects();
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy