statemanager.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

import java.awt.*;

public class StateManager {
    private State currentState;
    private RectState rState;
    private ArrowState aState;
    private CircleState cState;
    private FillState fState;

    public StateManager(Mediator med) {
        rState = new RectState(med);
        cState = new CircleState(med);
        aState = new ArrowState(med);
        fState = new FillState(med);
        currentState = aState;
    }
    //These methods are called when the tool buttons
    //are selected
    public void setRect() {currentState = rState;}
    public void setCircle() {currentState = cState;}
    public void setFill() {currentState = fState;}
    public void setArrow() {currentState = aState;}
    
    public void mouseDown(int x, int y) {
        currentState.mouseDown(x, y);
    }
    public void mouseUp(int x, int y) {
        currentState.mouseUp(x, y);
    }
    public void mouseDrag(int x, int y) {
        currentState.mouseDrag(x, y);
    }
    public void select(Drawing d, Color c) {
        currentState.select(d, c);
    }
}