mirror of https://github.com/FreeCol/freecol.git
130 lines
4.1 KiB
Java
130 lines
4.1 KiB
Java
/**
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* Copyright (C) 2002-2015 The FreeCol Team
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*
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* This file is part of FreeCol.
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*
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* FreeCol is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* FreeCol is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with FreeCol. If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.sf.freecol.client.gui;
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import java.awt.Point;
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import java.awt.event.MouseEvent;
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import java.awt.event.MouseMotionListener;
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import java.util.logging.Logger;
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import net.sf.freecol.client.FreeColClient;
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import net.sf.freecol.common.model.PathNode;
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import net.sf.freecol.common.model.Tile;
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import net.sf.freecol.common.model.Unit;
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/**
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* Listens to the mouse being moved at the level of the Canvas.
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*/
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public final class CanvasMouseMotionListener extends AbstractCanvasListener
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implements MouseMotionListener {
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private static final Logger logger = Logger.getLogger(CanvasMouseMotionListener.class.getName());
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/** Number of pixels that must be moved before a goto is enabled. */
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private static final int DRAG_THRESHOLD = 16;
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/**
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* Temporary variable for checking if we need to recalculate the
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* path when dragging units.
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*/
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private Tile lastTile;
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/**
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* Creates a new listener for mouse movement.
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*
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* @param freeColClient The <code>FreeColClient</code> for the game.
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*/
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public CanvasMouseMotionListener(FreeColClient freeColClient, Canvas canvas) {
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super(freeColClient, canvas);
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}
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/**
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* Invoked when the mouse has been moved.
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*
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* @param e The MouseEvent that holds all the information.
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*/
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@Override
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public void mouseMoved(MouseEvent e) {
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if (e.getY() >= AUTO_SCROLL_SPACE) {
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performAutoScrollIfActive(e);
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}
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if (canvas.isGotoStarted()) {
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if (canvas.getActiveUnit() == null) {
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canvas.stopGoto();
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}
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Tile tile = canvas.convertToMapTile(e.getX(), e.getY());
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if (tile != null) {
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if (lastTile != tile) {
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Unit active = canvas.getActiveUnit();
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lastTile = tile;
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if (active != null && active.getTile() != tile) {
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PathNode dragPath = active.findPath(tile);
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canvas.setGotoPath(dragPath);
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} else {
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canvas.setGotoPath(null);
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}
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}
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}
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}
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}
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/**
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* Invoked when the mouse has been dragged.
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*
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* @param e The MouseEvent that holds all the information.
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*/
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@Override
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public void mouseDragged(MouseEvent e) {
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performDragScrollIfActive(e);
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Tile tile = canvas.convertToMapTile(e.getX(), e.getY());
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if (tile != null
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&& ((e.getModifiers() & MouseEvent.BUTTON1_MASK)
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== MouseEvent.BUTTON1_MASK)) {
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// only perform the goto for the left mouse button
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if (canvas.isGotoStarted()) {
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Unit active = canvas.getActiveUnit();
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if (active == null) {
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canvas.stopGoto();
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} else if (lastTile != tile) {
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lastTile = tile;
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PathNode dragPath = active.findPath(tile);
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canvas.setGotoPath(dragPath);
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}
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} else {
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// Only start a goto if the drag is 16 pixels or more
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Point dragPoint = canvas.getDragPoint();
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int deltaX = Math.abs(e.getX() - dragPoint.x);
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int deltaY = Math.abs(e.getY() - dragPoint.y);
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if (deltaX >= DRAG_THRESHOLD || deltaY >= DRAG_THRESHOLD) {
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canvas.startGoto();
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}
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}
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}
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}
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}
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