radiobutton2d.java

来自「java learn PPT java learn PPT java learn」· Java 代码 · 共 181 行

     import java.awt.*;
     import java.awt.event.*;
     import java.awt.geom.*;
     import java.util.*;

     public class RadioButton2D extends Component2D implements MouseListener
     {
          // 和按钮一起显示的标签
          protected Label2D label;

          // 这个按钮所从属的组
          protected RadioButtonGroup rbGroup;

          // 跟踪按钮状态的常量
          public static final int BUTTON_OFF  = 0;
          public static final int BUTTON_ON   = 1;

          // 用给定的标签、图像、按钮组和位置创建一个RadioButton2D
          public RadioButton2D(Label2D lbl, ImageGroup grp, RadioButtonGroup rbg, Vector2D p)
          {
               super();

               label   = lbl;    
               group   = grp;
               rbGroup = rbg;

               if(rbGroup != null)
               {
                    rbGroup.add(this);
               }

               setPos(p);
               updateBounds();
               update();
               setSelected(false);
          }

          // 用给定的图像、按钮组和位置创建一个新的RadioButton2D
          public RadioButton2D(ImageGroup grp, RadioButtonGroup rbg, Vector2D p)
          {
               this(null, grp, rbg, p);
          }

          // 用给定的标签、图像和按钮组创建一个新的RadioButton2D
          public RadioButton2D(Label2D lbl, ImageGroup grp, RadioButtonGroup rbg)
          {
               this(lbl, grp, rbg, Vector2D.ZERO_VECTOR);
          }

          // 用给定的图像组创建一个新的RadioButton2D
          public RadioButton2D(ImageGroup grp)
          {
               this(null, grp, null, Vector2D.ZERO_VECTOR);
          }

          // 返回按钮是否被选中
          public boolean isSelected()
          {
               return (state == BUTTON_ON); 
          }

          // 设置按钮的选中状态
          public void setSelected(boolean selected)
          {
               state = (selected) ? BUTTON_ON : BUTTON_OFF;
          }

          // 如果有的话返回按钮的文本描述 
          public String getText()
          {
               if(label != null)
               {
                    return label.getText();
               }
               return "";
          } 

          // 设置按钮和它的标签的可用状态
          public void setEnabled(boolean e)
          {
               super.setEnabled(e);

               if(label != null) 
               {
                    label.setEnabled(e);
               }
          }

          // 变换按钮的状态
          public void mousePressed(MouseEvent e) 
          {
               if(!isEnabled() || !isVisible()) return;

               // 如果没有按钮组则表明按钮独立行动
               if(rbGroup == null)
               {
                    if(bounds.contains(e.getPoint()))
                    {
                         setSelected(!isSelected());
                    }
               }

               // 否则,更新整个按钮组
               else
               {
                    if(bounds.contains(e.getPoint()))
                    {
                         setSelected(true);
                         rbGroup.updateGroup(this);
                    }
               }

          }

          public void mouseEntered(MouseEvent e) 
          {

          }

          public void mouseExited(MouseEvent e) 
          {

          }        

          public void mouseClicked(MouseEvent e) 
          {

          }

          public void mouseReleased(MouseEvent e) 
          {

          }

          // 用当前的变换绘制按钮
          public void paint(Graphics2D g2d)
          {
               // 只在组件可见时绘制
               if(isVisible())
               {
                    g2d.drawImage(((ButtonImageGroup) group).getFrame(state), xform, AnimationStrip.observer);  

                    // 如果标签有效则绘制标签
                    if(label != null)
                    {
                         label.paint(g2d);
                    }             
               } 
          }

          // 在给定的位置绘制按钮          
          public void paint(Graphics2D g2d, double dx, double dy)
          {
               // 只绘制可见组件
               if(isVisible())
               {
                    g2d.drawImage(((ButtonImageGroup) group).getFrame(state),
                                  AffineTransform.getTranslateInstance(pos.getX() + dx,pos.getY() + dy),
                                  AnimationStrip.observer
                                  );               

                    // 如果标签有效则绘制标签
                    if(label != null)
                    {
                         label.paint(g2d, dx, dx);
                    }             
               }   
          }

          // 返回描述这个按钮的文本
          public String toString()
          {
               if(label != null)
               {
                    return super.toString() + " " + label.toString();
               }

               return super.toString();
          }

     }    // RadioButton2D