com.sciencegadgets.client.ui.KeyPadNumerical.java Source code

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Here is the source code for com.sciencegadgets.client.ui.KeyPadNumerical.java

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/*******************************************************************************
 *     This file is part of ScienceGadgets, a collection of educational tools
 *     Copyright (C) 2012-2015 by John Gralyan
 *
 *     ScienceGadgets is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Affero General Public License as
 *     published by the Free Software Foundation, either version 3 of
 *     the License, or (at your option) any later version.
 *
 *     ScienceGadgets is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Affero General Public License for more details.
 *
 *     You should have received a copy of the GNU Affero General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *     
 *     Contact us at info@sciencegadgets.org
 *******************************************************************************/
package com.sciencegadgets.client.ui;

import java.util.HashSet;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasKeyPressHandlers;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.dom.client.TouchStartEvent;
import com.google.gwt.event.dom.client.TouchStartHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlowPanel;
import com.sciencegadgets.client.Moderator;
import com.sciencegadgets.client.algebra.edit.RandomSpecPanel;

public class KeyPadNumerical extends FlowPanel {

    HashSet<NumberButton> buttons = new HashSet<NumberButton>();
    SymbolDisplay symbolDisplay;

    public static final String NEG = "-";
    public static final String PERIOD = ".";
    public static final String E = "E";
    public static final String CLEAR = "clear";

    NumberButton negButton = new NumberButton(NEG);
    NumberButton periodButton = new NumberButton(PERIOD);
    NumberButton eButton = new NumberButton(E);
    NumberButton clearButton = new NumberButton(CLEAR);

    public KeyPadNumerical(SymbolDisplay symbolDisplay, Boolean includeNumbers, Boolean includeNegative,
            Boolean includeOtherSymbols) {
        super();
        initialize(symbolDisplay, includeNumbers, includeNegative, includeOtherSymbols);
    }

    public KeyPadNumerical(SymbolDisplay symbolDisplay) {
        this(symbolDisplay, true, true, true);
    }

    public KeyPadNumerical(Boolean includeNumbers, Boolean includeNegative, Boolean includeOtherSymbols) {
        super();
        initialize(new SymbolDisplay(this), includeNumbers, includeNegative, includeOtherSymbols);
    }

    public KeyPadNumerical() {
        this(true, true, true);
    }

    private void initialize(SymbolDisplay symbolDisplay, Boolean includeNumbers, Boolean includeNegative,
            Boolean includeOtherSymbols) {
        symbolDisplay.setKeyPad(this);
        addStyleName(CSS.KEY_PAD_NUMERICAL);

        this.symbolDisplay = symbolDisplay;
        this.symbolDisplay.addStyleName(CSS.NUMBER_DISPLAY);

        //CLEAR
        clearButton.setTitle("clear");
        buttons.add(clearButton);
        this.add(clearButton);

        //SPECIAL SYMBOLS
        if (includeNegative) {
            negButton.setTitle("negative");
            buttons.add(negButton);
            this.add(negButton);
        }
        if (includeOtherSymbols) {
            periodButton.setTitle("decimal dot");
            buttons.add(periodButton);
            this.add(periodButton);

            eButton.setTitle("x10^");
            buttons.add(eButton);
            this.add(eButton);
        }

        // separate numbers from special characters
        FlowPanel gap = new FlowPanel();
        gap.setSize("100%", "5px");
        this.add(gap);

        //NUMBERS
        if (includeNumbers) {
            for (int i = 0; i < 10; i++) {
                NumberButton b = new NumberButton(i + "");
                buttons.add(b);
                this.add(b);
            }
        }

        if (Moderator.isTouch) {
            // Clear Display on Touch - clear
            symbolDisplay.addTouchStartHandler(new TouchStartHandler() {
                @Override
                public void onTouchStart(TouchStartEvent event) {
                    displaySelect();
                }
            });
            // Input
            addNumberTouchHandler(new TouchStartHandler() {
                @Override
                public void onTouchStart(TouchStartEvent event) {
                    event.preventDefault();
                    numberSelect(((Button) event.getSource()));
                }
            });
        } else {
            // Clear Display on Click - clear
            symbolDisplay.addClickHandler(new ClickHandler() {
                @Override
                public void onClick(ClickEvent event) {
                    displaySelect();
                }
            });
            // Input
            addNumberClickHandler(new ClickHandler() {
                @Override
                public void onClick(ClickEvent event) {
                    numberSelect(((Button) event.getSource()));
                }
            });
        }

        // reload to reset keys enabled
        symbolDisplay.setText(symbolDisplay.getText());
    }

    public void addNumberClickHandler(ClickHandler handler) {
        for (NumberButton b : buttons) {
            b.addClickHandler(handler);
        }
    }

    public void addNumberTouchHandler(TouchStartHandler handler) {
        for (NumberButton b : buttons) {
            b.addTouchStartHandler(handler);
        }
    }

    public void displaySelect() {
        symbolDisplay.setText("");
    }

    protected void numberSelect(Button button) {
        if (button == clearButton) {
            symbolDisplay.setText("");
        } else {
            numberSelect(button.getText());
        }
    }

    protected void numberSelect(String number) {

        String oldText = symbolDisplay.getText();
        String newText = "";
        if (RandomSpecPanel.RANDOM_SYMBOL.equals(oldText)) {
            newText = number;
        } else {
            newText = oldText + number;
        }
        symbolDisplay.setText(newText);
    }

    public SymbolDisplay getSymbolDisplay() {
        return symbolDisplay;
    }

}

class NumberButton extends Button {
    public NumberButton(String string) {
        super(string);
        addStyleName(CSS.SMALLEST_BUTTON);
    }
}