Hinzufügen calc
- hinzufügen des Taschenrechners(calcs) in mein Repo - First commitmain
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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/*
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* Der Calculator besitzt die basis Komponenten der Kalkulation +,-,*,%
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* Eingabe erfolgt über die Buttons auf dem Interface oder der Tastatur, wobei die Kalkulationtasten nur über das Interface
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* eingegeben werden können.
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*
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*/
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public class Calculator
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{
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public static void main(String[] args)
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{
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CalculatorFrame frame = new CalculatorFrame();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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// Visible auf true
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frame.setVisible(true);
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}
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}
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class CalculatorFrame extends JFrame
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{
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public CalculatorFrame()
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{
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setTitle("Taschenrechner");
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//Aufruf des Panels
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CalculatorPanel panel = new CalculatorPanel();
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panel.requestFocusInWindow();
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add(panel); // Panel zu jFrame adden
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pack();
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}
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}
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class CalculatorPanel extends JPanel
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{
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private JButton display;
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private JPanel panel;
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private double result;
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private String lastOperator;
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private boolean start;
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/*
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* zusammenbauen des panels, setzten buttons und layout
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*/
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public CalculatorPanel()
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{
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setLayout(new BorderLayout());
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result = 0;
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lastOperator = "=";
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start = true;
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display = new JButton("0");
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display.setEnabled(false);
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//setzten des displays noch oben
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add(display, BorderLayout.NORTH);
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//Actions
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ActionListener insert = new InsertAction();
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ActionListener operator = new OperatorAction();
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panel = new JPanel();
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panel.setLayout(new GridLayout(4, 4)); // layout aus 4 Rows / Cols 4 Aufbau
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//Setzten des Hintergrundes
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setBk();
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//Spalte 1
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addButton("7", insert);
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addButton("8", insert);
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addButton("9", insert);
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addButton(":", operator);
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//Spalte 2
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addButton("4", insert);
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addButton("5", insert);
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addButton("6", insert);
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addButton("*", operator);
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//Spalte 3
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addButton("1", insert);
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addButton("2", insert);
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addButton("3", insert);
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addButton("-", operator);
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//Spalte 4
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addButton("0", insert);
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addButton(".", insert);
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addButton("=", operator);
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addButton("+", operator);
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add(panel, BorderLayout.CENTER);
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// setzten des Focuses für die eingaben auf mein Swing grid
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panel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).clear();
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panel.getActionMap().clear();
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//hinzufügen der Keys für swing
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addKeys();
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panel.setFocusable(true);
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}
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//Setzten des Hintergrundes
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private void setBk()
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{
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setBackground(Color.white);
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panel.setBackground(Color.BLACK);
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}
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//#region Action-events
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// Actionlistener um auf eingaben per click zu reagieren
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private class InsertAction implements ActionListener
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{
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public void actionPerformed(ActionEvent event)
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{
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String input = event.getActionCommand();
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handleInput(input);
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}
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}
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//um auf eingaben per Tastatur zu reagieren
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private class KeyInsertAction extends AbstractAction
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{
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private String key;
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public KeyInsertAction(String key)
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{
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this.key = key;
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}
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// muss implementiert werden für die abstractAction
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public void actionPerformed(ActionEvent e)
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{
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handleInput(key);
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}
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}
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//commandListener falls es sich um einen Befehl handelt +*-...
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private class OperatorAction implements ActionListener
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{
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public void actionPerformed(ActionEvent event)
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{
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String operator = event.getActionCommand();
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handleCommand(operator);
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}
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}
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//#endregion
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//#region Handler
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//Handler des imputs
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private void handleInput(String input)
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{
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if (start)
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{
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display.setText("");
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start = false;
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}
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// setzten des display text bis rechen Operator
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display.setText(display.getText() + input);
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}
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//handler des Komandos
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private void handleCommand(String op)
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{
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if (start)
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{
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// wenn -
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if (op.equals("-"))
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{
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display.setText(op);
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start = false;
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}
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else
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lastOperator = op;
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}
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else
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{
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// Berechnung ausführen
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calculate(Double.parseDouble(display.getText()));
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lastOperator = op;
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// taschenrechner wieder auf rechen modus setzten
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start = true;
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}
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}
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//#endregion
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/**
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* Führt die anstehenden Berechnungen aus.
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* @param x der mit dem vorherigen Ergebnis zu berechnende Wert */
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public void calculate(double x)
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{
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try
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{
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// Berechnung durchführen und berechnung immer neu ausführen und anzeigen
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if (lastOperator.equals("+"))
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result += x;
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else if (lastOperator.equals("-"))
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result -= x;
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else if (lastOperator.equals("*"))
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result *= x;
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else if (lastOperator.equals("/"))
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result /= x;
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else if (lastOperator.equals("="))
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result = x;
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display.setText("" + result);
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}
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catch (NumberFormatException ex)
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{
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messageBox(ex.toString(), "Fehlerhafte Eingabe");
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}
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}
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//#region add-funktionen
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/**
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* hinzufügen der Keys
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* sind nötig damit Swing auf Tastatur éingaben reagieren kann
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* Verbindung zwischen einer Taste/Tastenkombination und einer Aktion da */
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private void addKeys()
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{
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// KeyBindings für die Zahlen 0 bis 9
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for (int i = 0; i < 10; i++)
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{
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String key = String.valueOf(i);
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// keys normal 0-9 normal
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panel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(key), key);
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panel.getActionMap().put(key, new KeyInsertAction(key));
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//Keys des numpad 0-9 einfügen
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panel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("NUMPAD" + i), "NUMPAD" + i);
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panel.getActionMap().put("NUMPAD" + i, new KeyInsertAction(key));
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}
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//oder so einfügen
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//panel.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_0, 0), "0");
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//panel.getActionMap().put("0", new KeyInsertAction("0")); das gleiche noch fürs numpad
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}
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/**
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* Button hinzufügen
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* @param lable => +-
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* @param listener => ob ein InsertAction oder ein OperatorAction */
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private void addButton(String label, ActionListener listener)
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{
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JButton button = new JButton(label);
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button.addActionListener(listener);
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button.setBackground(Color.lightGray);
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panel.add(button);
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}
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//#endregion
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/**
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* message box zum anzeigen von problemen
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*/
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private void messageBox(String sInfo, String sTitle) {
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JOptionPane.showMessageDialog(null, sInfo, "InfoBox: " + sTitle + " " + lastOperator, JOptionPane.INFORMATION_MESSAGE);
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}
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}
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