source: trunk/src/org/expeditee/items/MagneticConstraint/Actions/DownALineAction.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.MagneticConstraints;
import org.expeditee.items.MagneticConstraint.Utilities.Line;

public class DownALineAction extends MagneticConstraintAction {

        @Override 
        public boolean exec(final Item item) {
                if(item.getParent() == null || !this.isSpIDERCodePage(item.getParent())) return false;
                final Line currentLine = Line.getLineContainingToken(item);
                final Item startOfThisLine = currentLine.get(0);
                final Line nextLine = currentLine.next();
                if(nextLine == null) return false;
                final int nextLineLength = 
                                nextLine.get(nextLine.size() - 1).getX() + nextLine.get(nextLine.size() - 1).getBoundsWidth() - nextLine.get(0).getX();
                final int distanceThroughCurrentLine = DisplayController.getMouseX() - startOfThisLine.getX();
                if(distanceThroughCurrentLine <= nextLineLength) {
                        Item beneith = nextLine.get(0);
                        for(final Item token : nextLine) {
                                if(token.getX() <= item.getX()) beneith = token;
                                else break;
                        }
                        moveCursor(beneith);
                        MagneticConstraints.Log(this.getClass(), new Item[]{item, beneith}, 
                                        Line.getLineContainingToken(item).toArray(new Item[]{}), 
                                        "DownALineAction does not move any items around.  Only moves the cursor.  Item to move to detected as second primary.");
                } else {
                        moveCursor(nextLine.get(nextLine.size() - 1));
                        MagneticConstraints.Log(this.getClass(), new Item[]{item}, 
                                        Line.getLineContainingToken(item).toArray(new Item[]{}), 
                                        "DownALineAction does not move any items around.  Only moves the cursor.  Item to move to detected to be end of line below");
                }
                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("Down a line action does not have a inverted implementation.");
                return false;
        }
}