com.sciencegadgets.client.util.equationwriter.Symbol.java Source code

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Here is the source code for com.sciencegadgets.client.util.equationwriter.Symbol.java

Source

/*******************************************************************************
 *     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.util.equationwriter;

import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

public class Symbol extends HorizontalPanel {
    Label label;
    Image image;
    String utf8;
    int size;
    boolean isLoaded = false;
    VerticalPanel left = new VerticalPanel();
    VerticalPanel right = new VerticalPanel();
    HorizontalPanel top = new HorizontalPanel();
    HorizontalPanel bottom = new HorizontalPanel();
    ClickHandler invokeContextMenu;

    public Symbol(String u) {
        //image = new Image(url);
        utf8 = u;
        size = 10;
        label = new Label(utf8);
        right.add(top);
        right.add(bottom);
        left.add(label);

        this.add(left);
        this.add(right);

        this.getElement().getStyle().setPosition(Position.ABSOLUTE);
        setFont(size);
        setOnClick();
        addDomHandler(invokeContextMenu, ClickEvent.getType());

        top.getElement().getStyle().setWidth(10, Unit.PX);
        top.getElement().getStyle().setHeight(10, Unit.PX);
        top.getElement().getStyle().setBackgroundColor("green");
        top.addDomHandler(invokeKeyboard, ClickEvent.getType());
    }

    public void onLoad() {
        this.getElement().getStyle().setPosition(Position.ABSOLUTE);
    }

    private void setSize(int w, int h) {
        //image.setPixelSize(w, h);
    }

    void setFont(int s) {
        label.getElement().getStyle().setFontSize(s, Unit.EM);
    }

    private int getHeight() {
        return image.getHeight();
    }

    private int getWidth() {
        return image.getWidth();
    }

    public Symbol getSuperScript() {
        return (Symbol) top;
    }

    public void setSuperScript(Symbol s) {
        //int h = this.getHeight();
        //int w = this.getWidth();
        //s.setSize(w/4, h/4);

        s.setFont(size / 4);
        bottom.removeFromParent();
        top.removeFromParent();
        top = (HorizontalPanel) s;
        right.add(top);
        right.add(bottom);

    }

    public void setSubScript(Symbol s) {
        //int h = this.getHeight();
        //int w = this.getWidth();
        //s.setSize(w/4, h/4);
        s.setFont(size / 4);
        bottom.removeFromParent();
        top.removeFromParent();
        bottom = (HorizontalPanel) s;
        right.add(top);
        right.add(bottom);
        bottom.getElement().getStyle().setBottom(0, Unit.PX);
        bottom.getElement().getStyle().setPosition(Position.ABSOLUTE);
    }

    //public abstract void setOnClick();

    public void setOnClick() {
        invokeContextMenu = new ClickHandler() {
            public void onClick(ClickEvent event) {
                event.stopPropagation();
                Widget w = (Widget) event.getSource();
                w.getElement().getStyle().setBackgroundColor("red");
                new ContextMenu(event);
            }
        };
    }

    ClickHandler invokeKeyboard = new ClickHandler() {
        public void onClick(ClickEvent event) {
            event.stopPropagation();
            Widget w = (Widget) event.getSource();
            w.getElement().getStyle().setBackgroundColor("gray");
            RootPanel.get().add(new EquationKeyboard(w));
        }
    };

}