/* * @(#)Tool.java 5.2 * */ package CH.ifa.draw.framework; import java.awt.*; import java.awt.event.MouseEvent; import java.awt.event.KeyEvent; /** * A tool defines a mode of the drawing view. All input events * targeted to the drawing view are forwarded to its current tool.
* Tools inform their editor when they are done with an interaction * by calling the editor's toolDone() method. * The Tools are created once and reused. They * are initialized/deinitialized with activate()/deactivate(). *
*
* State
* Tool plays the role of the State. In encapsulates all state
* specific behavior. DrawingView plays the role of the StateContext.
* @see DrawingView
*/
public interface Tool {
/**
* Activates the tool for the given view. This method is called
* whenever the user switches to this tool. Use this method to
* reinitialize a tool.
*/
public void activate();
/**
* Deactivates the tool. This method is called whenever the user
* switches to another tool. Use this method to do some clean-up
* when the tool is switched. Subclassers should always call
* super.deactivate.
*/
public void deactivate();
/**
* Handles mouse down events in the drawing view.
*/
public void mouseDown(MouseEvent e, int x, int y);
/**
* Handles mouse drag events in the drawing view.
*/
public void mouseDrag(MouseEvent e, int x, int y);
/**
* Handles mouse up in the drawing view.
*/
public void mouseUp(MouseEvent e, int x, int y);
/**
* Handles mouse moves (if the mouse button is up).
*/
public void mouseMove(MouseEvent evt, int x, int y);
/**
* Handles key down events in the drawing view.
*/
public void keyDown(KeyEvent evt, int key);
}