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package bjc.utils.gui;
import java.awt.Component;
import java.util.function.Function;
import java.util.function.Predicate;
import javax.swing.JOptionPane;
/**
* Utility class for getting simple input from the user.
* @author ben
*
*/
public class SimpleDialogs {
/**
* Get a bounded integer from the user.
* @param parent The parent component for the dialogs.
* @param title The title for the dialogs.
* @param prompt The prompt to tell the user what to enter.
* @param lower The lower integer bound to accept.
* @param upper The upper integer bound to accept.
* @return A int within the specified bounds.
*/
public static int getBoundedInt(Component parent, String title,
String prompt, int lower, int upper) {
return getValue(parent, title, prompt, s -> {
try {
int n = Integer.parseInt(s);
return (n < upper) && (n > lower);
} catch (NumberFormatException nfe) {
return false;
}
} , Integer::parseInt);
}
/**
* Get a integer from the user
* @param parent The parent component for dialogs.
* @param title The title for dialogs.
* @param prompt The prompt to tell the user what to enter.
* @return A int.
*/
public static int getInt(Component parent, String title,
String prompt) {
return getValue(parent, title, prompt, s -> {
try {
Integer.parseInt(s);
return true;
} catch (NumberFormatException nfe) {
return false;
}
} , Integer::parseInt);
}
/**
* Get a string from the user
* @param parent The parent component for dialogs.
* @param title The title for the dialogs.
* @param prompt The prompt to tell the user what to enter.
* @return A string.
*/
public static String getString(Component parent, String title, String prompt) {
return JOptionPane.showInputDialog(parent, prompt, title,
JOptionPane.QUESTION_MESSAGE);
}
/**
* Get a value parsable from a string from the user.
* @param parent The parent component for dialogs.
* @param title The title for dialogs.
* @param prompt The prompt to tell the user what to enter.
* @param p A predicate to determine if a input is valid.
* @param f The function to transform the string into a value.
* @return The value parsed from a string.
*/
public static <E> E getValue(Component parent, String title,
String prompt, Predicate<String> p, Function<String, E> f) {
String inp = getString(parent, title, prompt);
while (!p.test(inp)) {
showError(parent, "I/O Error", "Please enter a valid value");
inp = getString(parent, title, prompt);
}
return f.apply(inp);
}
/**
* Get a whole number from the user.
* @param parent The parent component for dialogs.
* @param title The title for dialogs.
* @param prompt The prompt to tell the user what to enter.
* @return A whole number.
*/
public static int getWhole(Component parent, String title,
String prompt) {
return getBoundedInt(parent, title, prompt, 0, Integer.MAX_VALUE);
}
/**
* Ask the user a Yes/No question.
* @param parent The parent component for dialogs.
* @param title The title for dialogs.
* @param question The question to ask the user.
* @return True if the user said yes, false otherwise.
*/
public static boolean getYesNo(Component parent, String title,
String question) {
int res = JOptionPane.showConfirmDialog(parent, question, title,
JOptionPane.YES_NO_OPTION);
return (res == JOptionPane.YES_OPTION ? true : false);
}
/**
* Show a error message to the user
* @param parent The parent component for dialogs.
* @param title The title for dialogs.
* @param err The error to show the user.
*/
public static void showError(Component parent, String title,
String err) {
JOptionPane.showMessageDialog(parent, err, title,
JOptionPane.ERROR_MESSAGE);
}
}
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