com.dawg6.web.dhcalc.client.BaseSpinner.java Source code

Introduction

Here is the source code for com.dawg6.web.dhcalc.client.BaseSpinner.java

Source

/*******************************************************************************
 * Copyright (c) 2014, 2015 Scott Clarke (scott@dawg6.com).
 *
 * This file is part of Dawg6's Demon Hunter DPS Calculator.
 *
 * Dawg6's Demon Hunter DPS Calculator is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Dawg6's Demon Hunter DPS Calculator 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package com.dawg6.web.dhcalc.client;

import com.google.gwt.dom.client.Document;
import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.DomEvent;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.ValueBox;

public abstract class BaseSpinner<T> extends Composite {

    protected final ValueBox<T> box;
    protected final Button up;
    protected final Button down;
    protected T min;
    protected T max;
    protected T increment;

    /**
     * @wbp.parser.constructor
     */
    protected BaseSpinner(ValueBox<T> box, String text, T min, T max, T increment) {
        this.box = box;
        this.min = min;
        this.max = max;
        this.increment = increment;

        box.addKeyUpHandler(new KeyUpHandler() {

            @Override
            public void onKeyUp(KeyUpEvent event) {
                keyPressed();
            }
        });

        box.addFocusHandler(new FocusHandler() {

            @Override
            public void onFocus(FocusEvent event) {
                normalize();
            }
        });

        box.addBlurHandler(new BlurHandler() {

            @Override
            public void onBlur(BlurEvent event) {
                normalize();
            }
        });

        box.addChangeHandler(new ChangeHandler() {
            @Override
            public void onChange(ChangeEvent event) {
                normalize();
            }
        });

        HorizontalPanel horizontalPanel = new HorizontalPanel();
        horizontalPanel.setStyleName("spinner");
        horizontalPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
        initWidget(horizontalPanel);

        down = new Button();
        down.setText("-");
        down.setStyleName("spinnerDownButton");
        horizontalPanel.add(down);

        down.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                increment(-1);
            }
        });

        box.setStyleName("spinnerBox");
        box.setText(text);
        horizontalPanel.add(box);

        box.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                BaseSpinner.this.box.selectAll();
            }
        });

        up = new Button();
        up.setText("+");
        up.setStyleName("spinnerUpButton");
        horizontalPanel.add(up);

        up.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                increment(1);
            }
        });
    }

    protected abstract void keyPressed();

    protected void normalize() {
        setValue(getValue());
    }

    protected abstract void increment(int step);

    protected abstract T bound(T value);

    protected abstract T parse(String text);

    public void setValue(T value) {
        T a = getValue();
        T b = bound(value);

        if (!isEqual(a, b)) {
            this.box.setValue(b);
            DomEvent.fireNativeEvent(Document.get().createChangeEvent(), box);
        }
    }

    public T getValue() {
        T value = this.box.getValue();

        if (value == null) {
            value = min;
            this.box.setValue(value);
        }

        return value;
    }

    public void setVisibleLength(int w) {
        box.setVisibleLength(w);
    }

    public String getText() {
        return box.getText();
    }

    public void setText(String text) {
        setValue(parse(text));
    }

    public HandlerRegistration addChangeHandler(ChangeHandler handler) {
        return box.addChangeHandler(handler);
    }

    public T getMin() {
        return min;
    }

    public void setMin(T min) {
        this.min = min;
        normalize();
    }

    public T getMax() {
        return max;
    }

    public void setMax(T max) {
        this.max = max;
        normalize();
    }

    @Override
    public void setTitle(String title) {
        box.setTitle(title);
    }

    @Override
    public String getTitle() {
        return box.getTitle();
    }

    public T getIncrement() {
        return this.increment;
    }

    public void setIncrement(T i) {
        this.increment = i;
    }

    protected abstract boolean isEqual(T a, T b);
}