source: trunk/src/org/expeditee/items/MagneticConstraint/Actions/UpALineAction.java@ 1102

package org.expeditee.items.MagneticConstraint.Actions;

import org.expeditee.gui.DisplayController;
import org.expeditee.items.Item;
import org.expeditee.items.Text;
import org.expeditee.items.MagneticConstraint.MagneticConstraintAction;
import org.expeditee.items.MagneticConstraint.Utilities.Line;

public class UpALineAction extends MagneticConstraintAction {

        @Override
        public boolean exec(final Item item) {
                if(item.getParent() == null || !this.isSpIDERCodePage(item.getParent())) return false;
                final Line thisLine = Line.getLineContainingToken(item);
                final Item startOfThisLine = thisLine.get(0);
                final Item startOfLastLine = thisLine.last().get(0);
                if(startOfLastLine == null) return false;
                final Line lastLine = Line.getLineFromToken(startOfLastLine);
                final int lastLineLength = 
                                lastLine.get(lastLine.size() - 1).getX() + lastLine.get(lastLine.size() - 1).getBoundsWidth() - lastLine.get(0).getX();
                final int distanceThroughCurrentLine = DisplayController.getMouseX() - startOfThisLine.getX();
                if(distanceThroughCurrentLine <= lastLineLength) {
                        Item above = lastLine.get(0);
                        for(final Item token : lastLine) {
                                if(token.getX() <= item.getX()) above = token;
                                else break;
                        }
                        moveCursor(above);
                } else {
                        moveCursor(lastLine.get(lastLine.size() - 1));
                }
                return true;
        }
        
        private boolean moveCursor(final Item toMoveTo) {
                if(toMoveTo == null) return false;
                if(toMoveTo instanceof Text) {
                        final Text asText = (Text) toMoveTo;
                        DisplayController.setTextCursor(asText, Text.END);
                } else DisplayController.setCursorPosition(toMoveTo.getPosition(), false);
                return true;
        }

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