После воссоздания класса, чтобы я мог понять, как работает код, я внедрил там смещение. Обратите внимание, что я тестировал только с отрицательным смещением, но, похоже, он работает нормально. Я также изменил, как вы устанавливаете прослушиватели и переменные для управления, например, зону, и все, что она делает, проверяет половину и половину линии смещения, прежде чем принимать решение об использовании курсора. Таким образом, зона 7 будет иметь курсорную проверку 3 снаружи и 3 внутри.
public class CustomResizer extends MouseAdapter
{
protected final static Map<Component, CustomResizer> instance = new HashMap<Component, CustomResizer>();
protected final static Map<Integer, Integer> cursors = new HashMap<Integer, Integer>();
{
cursors.put(1, Cursor.N_RESIZE_CURSOR);
cursors.put(2, Cursor.W_RESIZE_CURSOR);
cursors.put(4, Cursor.S_RESIZE_CURSOR);
cursors.put(8, Cursor.E_RESIZE_CURSOR);
cursors.put(3, Cursor.NW_RESIZE_CURSOR);
cursors.put(9, Cursor.NE_RESIZE_CURSOR);
cursors.put(6, Cursor.SW_RESIZE_CURSOR);
cursors.put(12, Cursor.SE_RESIZE_CURSOR);
}
public static CustomResizer install(Component component)
{
if(instance.containsKey(component))
{
CustomResizer.uninstall(component);
}
CustomResizer crInstance = new CustomResizer();
component.addMouseMotionListener(crInstance);
component.addMouseListener(crInstance);
instance.put(component, crInstance);
return crInstance;
}
public static void uninstall(Component component)
{
CustomResizer crInstance = instance.get(component);
instance.remove(component);
component.removeMouseListener(crInstance);
component.removeMouseMotionListener(crInstance);
}
public static CustomResizer getInstance(Component component)
{
return instance.get(component);
}
protected final static int NORTH = 1;
protected final static int WEST = 2;
protected final static int SOUTH = 4;
protected final static int EAST = 8;
private int zone = 7/2;
private int offset = 0;
private Point pressed;
private int direction;
private Rectangle bounds;
private boolean resizing;
private boolean autoscrolls;
private Cursor originalCursor;
@Override
public void mouseEntered(MouseEvent e)
{
originalCursor = !(resizing) ? e.getComponent().getCursor() : originalCursor;
}
@Override
public void mouseExited(MouseEvent e)
{
Component source = e.getComponent();
source.setCursor(!(resizing) ? originalCursor : source.getCursor());
}
@Override
public void mousePressed(MouseEvent e)
{
if(direction != 0)
{
resizing = true;
pressed = e.getPoint();
Component source = e.getComponent();
SwingUtilities.convertPointToScreen(pressed, source);
bounds = source.getBounds();
if(source instanceof JComponent)
{
JComponent jc = (JComponent) source;
autoscrolls = jc.getAutoscrolls();
jc.setAutoscrolls(false);
}
}
}
@Override
public void mouseDragged(MouseEvent e)
{
if(resizing)
{
Component source = e.getComponent();
Point dragged = e.getPoint();
SwingUtilities.convertPointToScreen(dragged, source);
int x = bounds.x;
int y = bounds.y;
int width = bounds.width;
int height = bounds.height;
Dimension maximumSize = source.getMaximumSize();
Dimension minimumSize = source.getMinimumSize();
if(WEST == (direction & WEST))
{
int drag = getDragDistance(pressed.x, dragged.x);
drag = getDragBounded(drag, width, minimumSize.width, Math.min(width + x - offset, maximumSize.width));
x -= drag;
width += drag;
}
if(NORTH == (direction & NORTH))
{
int drag = getDragDistance(pressed.y, dragged.y);
drag = getDragBounded(drag, height, minimumSize.height, Math.min(height + y - offset, maximumSize.height));
y -= drag;
height += drag;
}
if(EAST == (direction & EAST))
{
int drag = getDragDistance(dragged.x, pressed.x);
drag = getDragBounded(drag, width, minimumSize.width, Math.min(getBoundingSize(source).width - x, maximumSize.width));
width += drag;
}
if(SOUTH == (direction & SOUTH))
{
int drag = getDragDistance(dragged.y, pressed.y);
drag = getDragBounded(drag, height, minimumSize.height, Math.min(getBoundingSize(source).height - y, maximumSize.height));
height += drag;
}
source.setBounds(x, y, width, height);
}
}
@Override
public void mouseMoved(MouseEvent e)
{
Component source = e.getComponent();
direction = 0;
Point location = e.getPoint();
int x = location.x;
int y = location.y;
int widthOffset = source.getWidth() + offset;
int heightOffset = source.getHeight() + offset;
if(x < -offset + zone && x > -offset - zone) direction += WEST;
if(x > widthOffset - zone && x < widthOffset + zone) direction += EAST;
if(y < -offset + zone && y > -offset - zone) direction += NORTH;
if(y > heightOffset - zone && y < heightOffset + zone) direction += SOUTH;
source.setCursor(direction == 0 ? originalCursor : Cursor.getPredefinedCursor(cursors.get(direction)));
}
@Override
public void mouseReleased(MouseEvent e)
{
resizing = false;
Component source = e.getComponent();
source.setCursor(originalCursor);
if(source instanceof JComponent)
{
((JComponent) source).setAutoscrolls(autoscrolls);
}
}
private int getDragDistance(int larger, int smaller)
{
int drag = larger - smaller;
drag += (drag < 0) ? -1 : 1;
return drag;
}
private int getDragBounded(int drag, int dimension, int minimum, int maximum)
{
while(dimension + drag < minimum) drag += 1;
while(dimension + drag > maximum) drag -= 1;
return drag;
}
private Dimension getBoundingSize(Component source)
{
if(source instanceof Window)
{
Rectangle bounds = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds();
return new Dimension(bounds.width - offset, bounds.height - offset);
}
else
{
Dimension size = source.getParent().getSize();
return new Dimension(size.width - offset, size.height - offset);
}
}
public void setOffset(int offset)
{
this.offset = offset;
}
public int getOffset()
{
return offset;
}
public void setZone(int zone)
{
this.zone = zone/2;
}
public int getZone()
{
return zone;
}
}
