Swing中按ctrl键同时移动鼠标拖动组件(类中多借口共享同一数据)
都知道java中类只能单继承,但可以实现多个接口,但我发现实现多个接口之后,多个接口却不能共享同一个数据,应用开发中想实现:当用户按着ctrl键时,可以用鼠标点击拖动组件,比如说文本框。
编写一个监听实现KeyListener,NouseListener,MouseMotionListener三个接口,重写方法。定义一个全局变量boolean ctrlPressed;
@Override
public void keyPressed(KeyEvent e) {
if(e.getModifiers()==InputEvent.CTRL_MASK)
{
ctrlPressed=true;
System.out.println("ctrl is pressed");
}
}@Override
public void keyReleased(KeyEvent e) {
ctrlPressed=false;
System.out.println("ctrl release");
}
用户在按下ctrl的时候为true,在MouseMotionListener接口的方法中判断ctrlPressed是否为真。
public void mouseDragged(MouseEvent e) {
if(ctrlPressed)
{
...........//实现拖动
}
}
这么写也不会报错,结果呢,mouseDragged方法中ctrlPressed却一直是false,按照逻辑来说用户按着ctrl,在keyPressed已经更改了ctrlPressed=true了呀!所以咯,不同的接口的方法是不能共用同一个变量的,全局变量,ctrlPressed,在不同的监听域中创建了不同的存储单元,也可以说是私有化了!我的解决办法是,创建一个类SharedData,创建静态变量ctrlPressed,而在keyPressed,和MouseDagged方法中都是用这个静态变量就能共用了!下面是我的具体实现代码,这个监听类,这个类可以实现选中组件中间移动组件,四周放大缩小组件,用的时候只需要添加监听即可,三个都要加哦
diamend.addMouseMotionListener(new PainRectListener(mJFrame,diamend));
diamend.addMouseListener(new PainRectListener(mJFrame,diamend));
diamend.addKeyListener(new PainRectListener(mJFrame,diamend));
package com.msi.frame; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Point; import java.awt.Rectangle; import java.awt.event.InputEvent; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextPane; import javax.swing.KeyStroke; /** * 組件拖動事件的監聽,任意組件都可以使用這個方法 * @author sharkliu * */ public class PainRectListener implements KeyListener,MouseListener,MouseMotionListener{ private JFrame mJFrame; private JTextPane panel; //private boolean ctrlPressed=false; public PainRectListener(JFrame mJFrame,JTextPane panel) { this.mJFrame=mJFrame; this.panel=panel; } /**当前是否操作图片**/ private boolean isContains(Point point){ Rectangle rectangle = new Rectangle(); rectangle.x=0; rectangle.y = 0; rectangle.width = ShareData.componentSize[0]; rectangle.height = ShareData.componentSize[1]; return rectangle.contains(point); } /**得到是否是点击的4个边中的1个(0,1,2,3,4)**/ private int getPressSide(Point point){ int side = 0; Rectangle rectTop = new Rectangle(0,0,ShareData.componentSize[0],8); Rectangle rectBottom = new Rectangle(0,ShareData.componentSize[1]-8,ShareData.componentSize[0],8); Rectangle rectLeft = new Rectangle(0,8,8,ShareData.componentSize[1]-8); Rectangle rectRight = new Rectangle(ShareData.componentSize[0]-8,8,8,ShareData.componentSize[1]-8); if(rectTop.contains(point)){ return 1; //上 }else if(rectBottom.contains(point)){ System.out.println("下"); return 2; //下 }else if(rectLeft.contains(point)){ System.out.println("左"); return 3; //左 }else if(rectRight.contains(point)){ System.out.println("右"); return 4; //右 } return side; //中间 } public void mouseDragged(MouseEvent e) { System.out.println(ctrlPressed); if(ShareData.isPressComponent&&ShareData.ctrlPressed){ System.out.println("mouseDragged ininin"); Point nowPoint = e.getPoint(); //当前鼠标拖拽到的鼠标位置 int diffX = nowPoint.x - ShareData.pressPoint.x; int diffY = nowPoint.y - ShareData.pressPoint.y; /**移动**/ if(ShareData.moveSide == 0){ ShareData.componentPoint.x += diffX; ShareData.componentPoint.y += diffY; } /**收缩**/ else{ //收缩 下和右时 if(ShareData.moveSide == 2 || ShareData.moveSide == 4){ if(ShareData.moveSide == 2) //拉下(只能拉长拉短) ShareData.componentSize[1] += diffY; else //拉右(只能拉宽拉窄) ShareData.componentSize[0] += diffX; } //收缩 上和左时 else if(ShareData.moveSide == 1 || ShareData.moveSide == 3){ if(ShareData.moveSide == 1){ //拉上边(只能拉长拉短) ShareData.componentPoint.y += diffY; ShareData.componentSize[1] -= diffY; }else{ //拉左边(只能拉宽拉窄) ShareData.componentPoint.x += diffX; ShareData.componentSize[0] -= diffX; } } ShareData.pressPoint = nowPoint; } //拖動組件改變組件的的寬不能超出黑框區域,以及防止拖動時把組件給拖沒了當size小於0組件無法匯出,便消失了 if( (ShareData.componentSize[0]>=20)&&(ShareData.componentSize[1]>=20)) { System.out.println("e"+e.getComponent()); panel.setBounds(ShareData.componentPoint.x, ShareData.componentPoint.y, ShareData.componentSize[0], ShareData.componentSize[1]); panel.setPreferredSize(new Dimension(ShareData.componentSize[0],ShareData.componentSize[1])); panel.setSize(ShareData.componentSize[0], ShareData.componentSize[1]); mJFrame.validate();// 重构内容面板 mJFrame.repaint();// 重绘内容面板 } } } private void paintRect(Graphics graphics) { graphics.drawLine(1, ShareData.componentSize[1]/2-1, ShareData.componentSize[0]/2-1, 1); graphics.drawLine(ShareData.componentSize[0]/2-1,2, ShareData.componentSize[0]-1, ShareData.componentSize[1]/2-1); graphics.drawLine(ShareData.componentSize[0]-1, ShareData.componentSize[1]/2-1, ShareData.componentSize[0]/2-1, ShareData.componentSize[1]-1); graphics.drawLine(ShareData.componentSize[0]/2-1, ShareData.componentSize[1]-1, 1, ShareData.componentSize[1]/2-1); } public void mouseMoved(MouseEvent e) { Rectangle rectTop = new Rectangle(0,0,ShareData.componentSize[0],8); Rectangle rectBottom = new Rectangle(0,ShareData.componentSize[1]-8,ShareData.componentSize[0],8); Rectangle rectLeft = new Rectangle(0,8,8,ShareData.componentSize[1]-8); Rectangle rectRight = new Rectangle(ShareData.componentSize[0]-8,8,8,ShareData.componentSize[1]-8); if(rectTop.contains(e.getPoint())){ e.getComponent().setCursor(new Cursor(Cursor.N_RESIZE_CURSOR)); }else if(rectBottom.contains(e.getPoint())){ System.out.println("下"); e.getComponent().setCursor(new Cursor(Cursor.S_RESIZE_CURSOR)); }else if(rectLeft.contains(e.getPoint())){ e.getComponent().setCursor(new Cursor(Cursor.W_RESIZE_CURSOR)); }else if(rectRight.contains(e.getPoint())){ e.getComponent().setCursor(new Cursor(Cursor.E_RESIZE_CURSOR)); } else{ e.getComponent().setCursor(new Cursor(Cursor.MOVE_CURSOR)); } } public void mouseClicked(MouseEvent e) { } /**把組件所占的矩阵用变量表示出来(便于判断是否操作图片)**/ /** * * 跟新初始化數 * */ public void mousePressed(MouseEvent e) { ShareData.componentPoint=e.getComponent().getLocation(); ShareData.componentSize[0]=e.getComponent().getSize().width; ShareData.componentSize[1]=e.getComponent().getSize().height; //這是爲了區分對待圖片和文本,圖片隨時可以拖動,不受管控 if(isContains(new Point(e.getPoint().x, e.getPoint().y))){ ShareData.moveSide = getPressSide(new Point(e.getPoint().x, e.getPoint().y)); //记录操作图片的边 ShareData.isPressComponent = true; ShareData.pressPoint = e.getPoint(); }else{ ShareData.isPressComponent = false; } } public void mouseReleased(MouseEvent e) { ShareData.isPressComponent = false; ShareData.pressPoint = null; } public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} @Override public void keyTyped(KeyEvent e) {} @Override public void keyPressed(KeyEvent e) { if(e.getModifiers()==InputEvent.CTRL_MASK) { ShareData.ctrlPressed=true; System.out.println("ctrl is pressed"); } } @Override public void keyReleased(KeyEvent e) { ShareData.ctrlPressed=false; System.out.println("ctrl release"); } }
package com.msi.frame; import java.awt.Component; import java.awt.Point; import javax.swing.JComponent; /** * 名字為共享數據,專門記錄工具欄點擊了那些屬性, * 在版面繪製的時候,可先查看這個類中有哪些動作 * @author sharkliu * */ public class ShareData { public static int textFont=12; public static int textStyle; public static boolean dragable=false;//可拖動 public static boolean editable=true;//可編輯 public static Component selectCompoment=null; public static int layer=1000;// /* * 控制組件移動、變形等需要共用到的數據 */ public static int[]componentSize=new int[]{1,1};//組件大小 public static boolean isPressComponent=false; //是否操作組件、圖片或者文本框 public static int moveSide=0; //拉升的边(0:移动 1:上 2:下 3:左 4:右) public static Point componentPoint; //組件(圖片或者文本框)位置 public static Point pressPoint; //press組件时的鼠标位置 //控制文字樣式的按鈕背景變換 public static boolean isBorder=false; public static boolean isItalic=false; public static boolean isUnderline=false; public static String CMD=""; public static boolean ctrlPressed=false; }
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