SWT(JFace)体验之圆环状(戒指型)

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本文介绍如何使用 SWT 库创建一个具有环形外观的窗口，并实现窗口拖动功能。该窗口通过数学方法绘制内外两个圆并进行相减得到环形区域，同时通过监听鼠标事件实现窗口的移动。

演示代码：

package swt_jface.demo1; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.MouseListener; import org.eclipse.swt.events.MouseMoveListener; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.graphics.Region; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class RingShell { int[] createCircle(int radius, int centerX, int centerY) { int[] points = new int[360 * 2]; for(int i=0; i<360; i++) { points[i*2] = centerX + (int)(radius * Math.cos(Math.toRadians(i))); points[i*2+1] = centerY + (int)(radius * Math.sin(Math.toRadians(i))); } return points; } Point originalPosition = null; public RingShell() { final Display display = new Display(); final Shell shell = new Shell(display, SWT.NO_TRIM | SWT.ON_TOP); shell.setBackground(display.getSystemColor(SWT.COLOR_DARK_MAGENTA)); Region region = new Region(); region.add(createCircle(100, 100, 100)); region.subtract(createCircle(50, 100, 100)); shell.setRegion(region); shell.addMouseListener(new MouseListener() { public void mouseDoubleClick(MouseEvent e) { display.dispose(); } public void mouseDown(MouseEvent e) { originalPosition = new Point(e.x, e.y); } public void mouseUp(MouseEvent e) { originalPosition = null; } }); shell.addMouseMoveListener(new MouseMoveListener() { public void mouseMove(MouseEvent e) { if(originalPosition == null) return; Point point = display.map(shell, null, e.x, e.y); shell.setLocation(point.x - originalPosition.x, point.y - originalPosition.y); System.out.println("Moved from: " + originalPosition + " to " + point); } }); Rectangle regionBounds = region.getBounds(); shell.setSize(regionBounds.width, regionBounds.height); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); region.dispose(); } public static void main(String[] args) { new RingShell(); } }