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/**
 * Copyright 2010 The PlayN Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package playn.java;

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;

import pythagoras.f.Point;

public class SWTMouse extends JavaMouse {

  private SWTPlatform platform;

  public SWTMouse(SWTPlatform platform) {
    super(platform);
    this.platform = platform;
  }

  public void init() {
    platform.display.addFilter(SWT.MouseDown, new org.eclipse.swt.widgets.Listener() {
      public void handleEvent (Event event) {
        if (event.widget == platform.graphics().canvas) {
          Point xy = scaleCoord(event);
          onMouseDown(event.time, xy.x, xy.y, mapButton(event.button));
        }
      }
    });
    platform.display.addFilter(SWT.MouseUp, new org.eclipse.swt.widgets.Listener() {
      public void handleEvent (Event event) {
        if (event.widget == platform.graphics().canvas) {
          Point xy = scaleCoord(event);
          onMouseUp(event.time, xy.x, xy.y, mapButton(event.button));
        }
      }
    });
    platform.display.addFilter(SWT.MouseMove, new org.eclipse.swt.widgets.Listener() {
      public void handleEvent (Event event) {
        if (event.widget == platform.graphics().canvas) {
          Point xy = scaleCoord(event);
          float dx = xy.x - lastX, dy = xy.y - lastY;
          onMouseMove(event.time, xy.x, xy.y, dx, dy);
        }
      }
      private float lastX, lastY;
    });
    platform.display.addFilter(SWT.MouseWheel, new org.eclipse.swt.widgets.Listener() {
      public void handleEvent (Event event) {
        if (event.widget == platform.graphics().canvas) {
          Point xy = scaleCoord(event);
          onMouseWheelScroll(event.time, xy.x, xy.y, -event.count);
        }
      }
    });
  }

  public void update() {
    // not needed
  }

  private Point scaleCoord(Event event) {
    return platform.graphics().transformMouse(new Point(event.x, event.y));
  }

  private int mapButton(int swtButton) {
    switch (swtButton) {
    case 1:  return BUTTON_LEFT;
    case 2:  return BUTTON_MIDDLE;
    case 3:  return BUTTON_RIGHT;
    default: return swtButton;
    }
  }
}