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package com.fathzer.soft.ajlib.swing.widget;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import java.awt.GridBagConstraints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.ImageIcon;
import com.fathzer.soft.ajlib.swing.Utils;
import com.fathzer.soft.ajlib.swing.dialog.FileChooser;
import com.fathzer.soft.ajlib.swing.framework.Application;
import com.fathzer.soft.ajlib.utilities.NullUtils;
/** An abstract widget composed of four buttons to open, save, save as and create new file.
* @author Jean-Marc Astesana
* License: LGPL v3
*/
public abstract class AbstractFileSelector extends JPanel {
private static final long serialVersionUID = 1L;
/** A property bind with the file selected in this panel.*/
public static final String SELECTED_FILE_PROPERTY = "SELECTED_FILE";
/** A property bind with the changes of the data managed by this panel.*/
public static final String CHANGED_PROPERTY = "CHANGED";
/** A property bind with the emptiness the data managed by this panel.*/
public static final String EMPTY_PROPERTY = "EMPTY";
private JButton btnOpen;
private JButton btnNew;
private JButton btnSave;
private JButton btnSaveAs;
private File file;
private boolean isChanged;
/**
* Creates the panel.
*/
protected AbstractFileSelector() {
initialize();
this.isChanged = false;
}
private void initialize() {
GridBagLayout gridBagLayout = new GridBagLayout();
setLayout(gridBagLayout);
GridBagConstraints gbcBtnOpen = new GridBagConstraints();
gbcBtnOpen.gridx = 0;
gbcBtnOpen.gridy = 0;
add(getBtnOpen(), gbcBtnOpen);
GridBagConstraints gbcBtnNew = new GridBagConstraints();
gbcBtnNew.gridx = 1;
gbcBtnNew.gridy = 0;
add(getBtnNew(), gbcBtnNew);
GridBagConstraints gbcBtnSave = new GridBagConstraints();
gbcBtnSave.gridx = 2;
gbcBtnSave.gridy = 0;
add(getBtnSave(), gbcBtnSave);
GridBagConstraints gbcBtnSaveAs = new GridBagConstraints();
gbcBtnSaveAs.weightx = 1.0;
gbcBtnSaveAs.anchor = GridBagConstraints.WEST;
gbcBtnSaveAs.gridx = 3;
gbcBtnSaveAs.gridy = 0;
add(getBtnSaveAs(), gbcBtnSaveAs);
}
protected JButton getBtnOpen() {
if (btnOpen == null) {
btnOpen = new JButton(Application.getString("FileSelector.open", getLocale())); //$NON-NLS-1$
btnOpen.setToolTipText(Application.getString("FileSelector.open.tooltip", getLocale())); //$NON-NLS-1$
btnOpen.setIcon(new ImageIcon(AbstractFileSelector.class.getResource("Open.png"))); //$NON-NLS-1$
btnOpen.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (!lastChanceToSave()) {
return;
}
JFileChooser chooser = new FileChooser();
if (getSelectedFile()!=null) {
chooser.setCurrentDirectory(getSelectedFile().getParentFile());
}
File selectedFile = chooser.showOpenDialog(Utils.getOwnerWindow(btnOpen)) == JFileChooser.APPROVE_OPTION ? chooser.getSelectedFile() : null;
if (selectedFile != null && read(selectedFile)) {
setFile(selectedFile);
setEmpty(false);
}
}
});
}
return btnOpen;
}
protected JButton getBtnNew() {
if (btnNew == null) {
btnNew = new JButton(Application.getString("FileSelector.new", getLocale())); //$NON-NLS-1$
btnNew.setIcon(new ImageIcon(AbstractFileSelector.class.getResource("New.png"))); //$NON-NLS-1$
btnNew.setToolTipText(Application.getString("FileSelector.new.tooltip", getLocale())); //$NON-NLS-1$
btnNew.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (!lastChanceToSave()) {
return;
}
newFile();
setEmpty(true);
setFile(null);
}
});
}
return btnNew;
}
protected JButton getBtnSave() {
if (btnSave == null) {
btnSave = new JButton(Application.getString("FileSelector.save", getLocale())); //$NON-NLS-1$
btnSave.setIcon(new ImageIcon(AbstractFileSelector.class.getResource("Save.png"))); //$NON-NLS-1$
btnSave.setToolTipText(Application.getString("FileSelector.save.tooltip", getLocale())); //$NON-NLS-1$
btnSave.setEnabled(false);
btnSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
File selectedFile = getSelectedFile();
if (selectedFile==null) {
JFileChooser chooser = new FileChooser();
selectedFile = chooser.showSaveDialog(Utils.getOwnerWindow(btnSave)) == JFileChooser.APPROVE_OPTION ? chooser.getSelectedFile() : null;
}
if (selectedFile != null && save(selectedFile)) {
setFile(selectedFile);
}
}
});
}
return btnSave;
}
protected JButton getBtnSaveAs() {
if (btnSaveAs == null) {
btnSaveAs = new JButton(Application.getString("FileSelector.saveAs", getLocale())); //$NON-NLS-1$
btnSaveAs.setIcon(new ImageIcon(AbstractFileSelector.class.getResource("SaveAs.png"))); //$NON-NLS-1$
btnSaveAs.setToolTipText(Application.getString("FileSelector.saveAs.tooltip", getLocale())); //$NON-NLS-1$
btnSaveAs.setEnabled(false);
btnSaveAs.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new FileChooser();
if (getSelectedFile()!=null) {
chooser.setCurrentDirectory(getSelectedFile().getParentFile());
}
File selectedFile = chooser.showSaveDialog(Utils.getOwnerWindow(btnSave)) == JFileChooser.APPROVE_OPTION ? chooser.getSelectedFile() : null;
if (selectedFile != null && save(selectedFile)) {
setFile(selectedFile);
}
}
});
}
return btnSaveAs;
}
private void updateButtons(boolean isEmpty) {
getBtnSaveAs().setEnabled(!isEmpty);
getBtnSave().setEnabled(!isEmpty && isChanged());
}
/** Informs this panel that the data was changed since last save.
* This method should be called when the data state changes.
* Please note that when data is successfully read, saved, or created using this panel buttons, changed state is automatically set to false.
* @param isChanged true if dated as been modified since last call to save method.
* @see #save(File)
*/
public void setChanged(boolean isChanged) {
if (isChanged!=this.isChanged) {
boolean oldIsChanged = this.isChanged;
this.isChanged = isChanged;
updateButtons(isEmpty());
firePropertyChange(CHANGED_PROPERTY, oldIsChanged, isChanged);
}
}
/** Informs this panel that the data was changed since last save.
* This method should be called when the data state changes.
* Please note that when data is successfully read, empty state is automatically set to false.
* Please note that when data is successfully create, empty state is automatically set to true.
* @param isEmpty true if data is empty.
*/
public void setEmpty(boolean isEmpty) {
if (isEmpty!=this.isEmpty()) {
boolean oldIsEmpty = isEmpty();
updateButtons(isEmpty);
firePropertyChange(EMPTY_PROPERTY, oldIsEmpty, isEmpty);
}
}
/** This method is called before changing the selected file.
* If current data is not saved yet, this method asks the user what to do (ignore, save, cancel).
* You can call this method if needed, for example, when the window containing this widget is closing.
* @return true if the process can continue, false to keep everything unchanged
*/
public boolean lastChanceToSave() {
if (!getBtnSave().isEnabled()) {
// If save button is enabled, there's nothing to save
return true;
}
String[] options = new String[]{getBtnSave().getText(),Application.getString("GenericButton.ignore", getLocale()),
Application.getString("GenericButton.cancel", getLocale())}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
int n = JOptionPane.showOptionDialog(Utils.getOwnerWindow(this),
getUnsavedQuestion(),
Application.getString("FileSelector.unsavedChanges", getLocale()), //$NON-NLS-1$
JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.WARNING_MESSAGE,
null, //do not use a custom Icon
options, //the titles of buttons
options[2]); //default button title
if (n==-1 || n==2) {
return false;
} else if (n==0) {
if (getSelectedFile()==null) {
JFileChooser chooser = new FileChooser();
File selectedFile = chooser.showSaveDialog(Utils.getOwnerWindow(this)) == JFileChooser.APPROVE_OPTION ? chooser.getSelectedFile() : null;
if (selectedFile != null) {
boolean ok = save(selectedFile);
if (ok) {
setFile(selectedFile);
}
return ok;
} else {
return false;
}
}
}
return true;
}
/** Gets the question to ask to the user when lastChanceToSave is called and data has unsaved changes.
* Subclasses may override this method to customize the question.
* @return The question to ask.
*/
protected String getUnsavedQuestion() {
return Application.getString("FileSelector.unsavedChanges.question", getLocale()); //$NON-NLS-1$
}
/** Reads a file.
* This method is called when the user clicks the "open" button.
* @param file The file to read.
* @return true if the file was successfully read, false if the file reading failed.
*/
protected abstract boolean read(File file);
/** Creates a new empty data set.
* This method is called when the user clicks the "new" button.
*/
protected abstract void newFile();
/** Saves the data to a file.
* This method is called when the user clicks the "Save" or "Save as" buttons.
* @param file The file where to save the data.
* @return true if the save succeeds.
*/
protected abstract boolean save(File file);
/** Gets the current edited file.
* @return The selected file or null if no file is selected.
*/
public File getSelectedFile() {
return this.file;
}
/** Sets the selected file.
* If current file has unmodified changes, a dialog asks the user if he wants to save the changes.
* @param file The file to read or null to clear the data and select no file
*/
public void setSelectedFile(File file) {
if (!NullUtils.areEquals(this.file, file)) {
if (!lastChanceToSave()) {
return;
}
if (file == null && lastChanceToSave()) {
newFile();
setFile(null);
} else if (read(file)) {
setFile(file);
}
}
}
private void setFile(File file) {
File old = this.file;
this.file = file;
firePropertyChange(SELECTED_FILE_PROPERTY, old, file);
setChanged(false);
}
public boolean isEmpty() {
return !getBtnSaveAs().isEnabled();
}
public boolean isChanged() {
return isChanged;
}
}
