source: trunk/src/org/expeditee/items/MagneticConstraint/Actions/BackspaceAction.java@ 967

package org.expeditee.items.MagneticConstraint.Actions;

import org.expeditee.gui.DisplayIO;
import org.expeditee.items.Item;
import org.expeditee.items.Text;
import org.expeditee.items.MagneticConstraint.MagneticConstraintAction;
import org.expeditee.items.MagneticConstraint.Utilities.Line;
import org.expeditee.items.MagneticConstraint.Utilities.Paragraph;
import org.expeditee.items.MagneticConstraint.Utilities.TextLogic;

public class BackspaceAction extends MagneticConstraintAction {

        @Override
        public boolean exec(final Item item) {
                if(item.getParent() == null || !this.isSpIDERCodePage(item.getParent())) return false;
                if(item == null || ((Text) item).isEmpty()) {
                        final Text temp = DisplayIO.getCurrentFrame().createNewText(".");
                        callback(temp);
                        if(temp.getMagnetizedItemLeft() != -1) 
                                DisplayIO.setTextCursor((Text) temp.getParent().getItemWithID(temp.getMagnetizedItemLeft()), Text.END);
                        else if(temp.getMagnetizedItemTop() != -1) 
                                DisplayIO.setTextCursor((Text) temp.getParent().getItemWithID(temp.getMagnetizedItemTop()), Text.END);
                        temp.delete();
                        callback(temp);
                        return true;
                } else if(item.getMagnetizedItemLeft() != -1 && TextLogic.XIsBeforeCharacters((Text) item, DisplayIO.getMouseX())) {
                        new LastItemAction().exec(item);
                        return true;
                } else if(item.getMagnetizedItemTop() != -1 && TextLogic.XIsBeforeCharacters((Text) item, DisplayIO.getMouseX())) {
                        callback(item);
                        final Line currentLine = Line.getLineFromToken(item);
                        final Line lastLine = currentLine.last();
                        if(lastLine != null && Paragraph.getParagraphFromLine(lastLine).contains(currentLine)) {
                                lastLine.appendLine(currentLine);
                                DisplayIO.setTextCursor((Text) item, Text.HOME);
                                callback(item);
                                return true;
                        }
                }
                return false;
        }

        @Override
        public boolean invert(Item item) {
                System.err.println("Repel text up action does not have a inverted implementation.");
                return false;
        }
}