我有一个没有装饰的jFrame只有gui是由图形GD绘制的。我希望用户调整此窗口的大小，但不可能没有边框。因此，当我从一个特殊的位置拖动时，我制作了一个鼠标监听器来调整大小。它有点工作，但直到停止都没有延伸。有更简单的方法吗？还有其他选择吗？有没有人用纯GD做过这个？
this.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
posX=e.getX();
posY=e.getY();
}
}});
this.addMouseMotionListener(new MouseAdapter()
{
public void mouseDragged(MouseEvent evt)
{
if (posX >= getWidth()-25 && posY >=getHeight()-45){
int nlx= evt.getXOnScreen()-(location().x-12);
int nly= evt.getYOnScreen()-(location().y-32);
setSize(nlx,nly);
setBackground(new Color(0, 0, 0, 0));
invalidate();
}else{
setLocation (evt.getXOnScreen()-posX,evt.getYOnScreen()-posY);
}
}
});
}
答案 0 :(得分：2)
我用jFrame做了类似的事情，我通过在jFrame的外部添加4个非常薄的按钮来解决它，并使用按钮上的鼠标按下和mousedragged监听器来控制jFrame调整大小，它运行得相当顺利。
mousePressed侦听器让我们获取起始位置，以便我可以计算拖动/调整帧的距离
如果要保存资源，则应在释放鼠标时调整所有子组件的大小，而不是在拖动鼠标时调整其大小
编辑：在X轴上调整框架大小的示例。
public class NewJFrame extends javax.swing.JFrame
{
//demo locations
int X1 = 0;
int X2 = 0;
public NewJFrame()
{
initComponents();
}
@SuppressWarnings("unchecked")
private void initComponents() {
ResizeEast = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setUndecorated(true);
ResizeEast.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
ResizeEastMousePressed(evt);
}
public void mouseReleased(java.awt.event.MouseEvent evt) {
ResizeEastMouseReleased(evt);
}
});
ResizeEast.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseDragged(java.awt.event.MouseEvent evt) {
ResizeEastMouseDragged(evt);
}
});
jButton1.setText("Close");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 320, Short.MAX_VALUE)
.addComponent(ResizeEast, javax.swing.GroupLayout.PREFERRED_SIZE, 11, javax.swing.GroupLayout.PREFERRED_SIZE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton1)
.addContainerGap(266, Short.MAX_VALUE))
.addComponent(ResizeEast, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
);
pack();
}
private void ResizeEastMousePressed(java.awt.event.MouseEvent evt)
{
//set mosuepressed location to X1 and Y1
X1 = evt.getX();
}
private void ResizeEastMouseReleased(java.awt.event.MouseEvent evt)
{
//update the location and size of all child components
}
private void ResizeEastMouseDragged(java.awt.event.MouseEvent evt)
{
//resize jframe on the fly
X2 = evt.getX();
//set minimum size to 100 wide
if ((getWidth() - (X1 - X2)) < 100)
{
X2 = X1;
}
//resize east side only
this.setSize(getWidth() - (X1 - X2), getHeight());
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
System.exit(0);
}
public static void main(String args[])
{
java.awt.EventQueue.invokeLater(new Runnable()
{
public void run()
{
new NewJFrame().setVisible(true);
}
});
}
// Variables
private javax.swing.JButton ResizeEast;
private javax.swing.JButton jButton1;
}
要从角落重新调整大小，请创建小角落按钮，调整X和Y的大小，如下所示：YourFrame.setSize(getWidth() - (X1 - X2), getHeight() - (Y1 - Y2));
答案 1 :(得分：2)
这是我现在使用的完整鼠标适配器：
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
/**
* @see http://stackoverflow.com/a/12456113/909085
*/
public class WindowResizeAdapter extends MouseAdapter implements SwingConstants
{
private boolean resizing = false;
private int prevX = -1;
private int prevY = -1;
private int resizeSide = 0;
public static void install ( Component component, int resizeSide )
{
WindowResizeAdapter wra = new WindowResizeAdapter ( resizeSide );
component.addMouseListener ( wra );
component.addMouseMotionListener ( wra );
}
public WindowResizeAdapter ( int resizeSide )
{
super ();
this.resizeSide = resizeSide;
}
public void mousePressed ( MouseEvent e )
{
if ( SwingUtilities.isLeftMouseButton ( e ) )
{
resizing = true;
}
prevX = e.getXOnScreen ();
prevY = e.getYOnScreen ();
}
public void mouseDragged ( MouseEvent e )
{
if ( prevX != -1 && prevY != -1 && resizing )
{
Window w = SwingUtilities.getWindowAncestor ( e.getComponent () );
Rectangle rect = w.getBounds ();
Dimension dim;
boolean undecorated;
if ( w instanceof JDialog )
{
dim = ( ( JDialog ) w ).getContentPane ().getPreferredSize ();
undecorated = ( ( JDialog ) w ).isUndecorated ();
}
else if ( w instanceof JFrame )
{
dim = ( ( JFrame ) w ).getContentPane ().getPreferredSize ();
undecorated = ( ( JFrame ) w ).isUndecorated ();
}
else
{
dim = w.getPreferredSize ();
undecorated = true;
}
// Checking for minimal width and height
int xInc = e.getXOnScreen () - prevX;
int yInc = e.getYOnScreen () - prevY;
if ( undecorated )
{
if ( resizeSide == SwingConstants.NORTH_WEST || resizeSide == SwingConstants.WEST ||
resizeSide == SwingConstants.SOUTH_WEST )
{
if ( rect.width - xInc < dim.width )
{
xInc = 0;
}
}
else if ( resizeSide == SwingConstants.NORTH_EAST ||
resizeSide == SwingConstants.EAST ||
resizeSide == SwingConstants.SOUTH_EAST )
{
if ( rect.width + xInc < dim.width )
{
xInc = 0;
}
}
if ( resizeSide == SwingConstants.NORTH_WEST ||
resizeSide == SwingConstants.NORTH ||
resizeSide == SwingConstants.NORTH_EAST )
{
if ( rect.height - yInc < dim.height )
{
yInc = 0;
}
}
else if ( resizeSide == SwingConstants.SOUTH_WEST ||
resizeSide == SwingConstants.SOUTH ||
resizeSide == SwingConstants.SOUTH_EAST )
{
if ( rect.height + yInc < dim.height )
{
yInc = 0;
}
}
}
// Resizing window if any changes are done
if ( xInc != 0 || yInc != 0 )
{
if ( resizeSide == SwingConstants.NORTH_WEST )
{
w.setBounds ( rect.x + xInc, rect.y + yInc, rect.width - xInc,
rect.height - yInc );
}
else if ( resizeSide == SwingConstants.NORTH )
{
w.setBounds ( rect.x, rect.y + yInc, rect.width, rect.height - yInc );
}
else if ( resizeSide == SwingConstants.NORTH_EAST )
{
w.setBounds ( rect.x, rect.y + yInc, rect.width + xInc, rect.height - yInc );
}
else if ( resizeSide == SwingConstants.WEST )
{
w.setBounds ( rect.x + xInc, rect.y, rect.width - xInc, rect.height );
}
else if ( resizeSide == SwingConstants.EAST )
{
w.setBounds ( rect.x, rect.y, rect.width + xInc, rect.height );
}
else if ( resizeSide == SwingConstants.SOUTH_WEST )
{
w.setBounds ( rect.x + xInc, rect.y, rect.width - xInc, rect.height + yInc );
}
else if ( resizeSide == SwingConstants.SOUTH )
{
w.setBounds ( rect.x, rect.y, rect.width, rect.height + yInc );
}
else if ( resizeSide == SwingConstants.SOUTH_EAST )
{
w.setBounds ( rect.x, rect.y, rect.width + xInc, rect.height + yInc );
}
prevX = e.getXOnScreen ();
prevY = e.getYOnScreen ();
}
}
}
public void mouseReleased ( MouseEvent e )
{
resizing = false;
}
}
只需使用其“install”方法将窗口大小调整行为添加到任何Component。 resizeSide变量用于定义应调整窗口的哪一侧（例如，SwingConstants.SOUTH_EAST将强制组件调整窗口右下角的大小）。
编辑：您可能还想修改特定情况的代码，以便只从组件上的某个特定区域开始拖动（调整大小）。只需修改mousePressed方法即可。