CEdgeHoverState.java

/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

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 com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.editmode.states;

import com.google.common.base.Preconditions;
import com.google.security.zynamics.zylib.gui.zygraph.editmode.CStateChange;
import com.google.security.zynamics.zylib.gui.zygraph.editmode.IMouseState;
import com.google.security.zynamics.zylib.gui.zygraph.editmode.IMouseStateChange;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.AbstractZyGraph;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.edges.ZyGraphEdge;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.editmode.CStateFactory;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.editmode.helpers.CMousePressedHandler;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.editmode.transformations.CHitEdgesTransformer;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.nodes.ZyGraphNode;

import y.base.Edge;
import y.view.HitInfo;

import java.awt.event.MouseEvent;

public class CEdgeHoverState implements IMouseState {
  /**
   * Used to create the next state when a state change is necessary.
   */
  private final CStateFactory<?, ?> m_factory;

  /**
   * The graph for which the mouse state is tracked.
   */
  private final AbstractZyGraph<?, ?> m_graph;

  /**
   * The node the mouse cursor is hovering over.
   */
  private final Edge m_edge;

  /**
   * Creates a new state object.
   * 
   * @param factory Used to create the next state when a state change is necessary.
   * @param graph The graph for which the mouse state is tracked.
   * @param edge The Edge the mouse cursor is hovering over.
   */
  public CEdgeHoverState(final CStateFactory<?, ?> factory, final AbstractZyGraph<?, ?> graph,
      final Edge edge) {
    m_graph = Preconditions.checkNotNull(graph, "Error: graph argument can not be null");
    m_factory = Preconditions.checkNotNull(factory, "Error: factory argument can not be null");
    m_edge = Preconditions.checkNotNull(edge, "Error: edge argument can not be null");
  }

  @Override
  public CStateFactory<? extends ZyGraphNode<?>, ? extends ZyGraphEdge<?, ?, ?>> getStateFactory() {
    return m_factory;
  }

  @Override
  public IMouseStateChange mouseDragged(final MouseEvent event, final AbstractZyGraph<?, ?> graph) {
    return new CStateChange(m_factory.createDefaultState(), true);
  }

  @Override
  public IMouseStateChange mouseMoved(final MouseEvent event, final AbstractZyGraph<?, ?> g) {
    final double x = m_graph.getEditMode().translateX(event.getX());
    final double y = m_graph.getEditMode().translateY(event.getY());

    final HitInfo hitInfo = m_graph.getGraph().getHitInfo(x, y);

    if (hitInfo.hasHitEdges()) {
      return CHitEdgesTransformer.changeEdge(m_factory, event, hitInfo, m_edge);
    } else {
      m_factory.createEdgeExitState(m_edge, event);

      return CHitEdgesTransformer.exitEdge(m_factory, event, hitInfo, this);
    }
  }

  @Override
  public IMouseStateChange mousePressed(final MouseEvent event, final AbstractZyGraph<?, ?> graph) {
    return CMousePressedHandler.handleMousePressed(m_factory, this, graph, event);
  }

  @Override
  public IMouseStateChange mouseReleased(final MouseEvent event, final AbstractZyGraph<?, ?> graph) {
    return new CStateChange(this, true);
  }
}