鼠标样式的相关问题

JAVA对于底层对象比如鼠标等还是得依靠JNI或是JNA来处理，这里记录下如何实现鼠标的获取、是否是默认鼠标样式判断等。

获取鼠标样式并显示：

import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

import com.sun.jna.Pointer;

public class LoadCursor {

	  public static void draw(BufferedImage image, int cursor,
	      int diFlags) {
	    int width = image.getWidth();
	    int height = image.getHeight();

	    User32 user32 = User32.INSTANCE;
	    Gdi32 gdi32 = Gdi32.INSTANCE;

	    Pointer hIcon = user32
	        .LoadCursorW(Pointer.NULL, cursor);
	    Pointer hdc = gdi32.CreateCompatibleDC(Pointer.NULL);
	    Pointer bitmap = gdi32.CreateCompatibleBitmap(hdc,
	        width, height);

	    gdi32.SelectObject(hdc, bitmap);
	    user32.DrawIconEx(hdc, 0, 0, hIcon, width, height, 0,
	        Pointer.NULL, diFlags);

	    for (int x = 0; x < width; x++) {
	      for (int y = 0; y < width; y++) {
	        int rgb = gdi32.GetPixel(hdc, x, y);
	        image.setRGB(x, y, rgb);
	      }
	    }

	    gdi32.DeleteObject(bitmap);
	    gdi32.DeleteDC(hdc);
	  }

	  public static void main(String[] args) {
	    final int width = 128;
	    final int height = 128;

	    BufferedImage image = new BufferedImage(width, height,
	        BufferedImage.TYPE_INT_ARGB);
	    draw(image, User32.IDC_HAND, User32.DI_NORMAL);
	    BufferedImage mask = new BufferedImage(width, height,
	        BufferedImage.TYPE_INT_RGB);
	    draw(mask, User32.IDC_HAND, User32.DI_MASK);
	    applyMask(image, mask);

	    JLabel icon = new JLabel();
	    icon.setIcon(new ImageIcon(image));

	    JFrame frame = new JFrame();
	    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setContentPane(icon);
	    frame.pack();
	    frame.setVisible(true);
	  }

	  private static void applyMask(BufferedImage image,
	      BufferedImage mask) {
	    int width = image.getWidth();
	    int height = image.getHeight();
	    for (int x = 0; x < width; x++) {
	      for (int y = 0; y < height; y++) {
	        int masked = mask.getRGB(x, y);
	        if ((masked & 0x00FFFFFF) == 0) {
	          int rgb = image.getRGB(x, y);
	          rgb = 0xFF000000 | rgb;
	          image.setRGB(x, y, rgb);
	        }
	      }
	    }
	  }

	}

判断鼠标是否是默认样式

import com.sun.jna.Pointer;

public class CursorTest {

	public static boolean isDefaultCursor() {

		final int width = 128;
		final int height = 128;

		User32 user32 = User32.INSTANCE;
		Gdi32 gdi32 = Gdi32.INSTANCE;

		Pointer hIcon = user32.LoadCursorW(Pointer.NULL, User32.IDC_HAND);
		Pointer hdc = gdi32.CreateCompatibleDC(Pointer.NULL);
		Pointer bitmap = gdi32.CreateCompatibleBitmap(hdc, width, height);

		gdi32.SelectObject(hdc, bitmap);
		user32.DrawIconEx(hdc, 0, 0, hIcon, width, height, 0, Pointer.NULL,
				User32.DI_MASK);

		for (int x = 0; x < width; x++) {
			for (int y = 0; y < width; y++) {
				int rgb = gdi32.GetPixel(hdc, x, y);
				// System.out.print(rgb+",");
				if (rgb == 0)
					return true;
			}
		}

		return false;
	}

	public static void main(String[] args) {

		boolean defaultCursor = isDefaultCursor();
		System.out.println(defaultCursor);
	}

}

相关类：

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Pointer;

public interface Gdi32 extends Library {

	  public static Gdi32 INSTANCE = (Gdi32) Native
	      .loadLibrary("Gdi32", Gdi32.class);

	  /** http://msdn.microsoft.com/en-us/library/dd183489(VS.85).aspx */
	  public Pointer CreateCompatibleDC(Pointer hdc);

	  /** http://msdn.microsoft.com/en-us/library/dd183488(VS.85).aspx */
	  public Pointer CreateCompatibleBitmap(Pointer hdc,
	      int nWidth, int nHeight);

	  /** http://msdn.microsoft.com/en-us/library/dd162957(VS.85).aspx */
	  public Pointer SelectObject(Pointer hdc, Pointer hgdiobj);

	  /** http://msdn.microsoft.com/en-us/library/dd145078(VS.85).aspx */
	  public int SetPixel(Pointer hdc, int X, int Y, int crColor);

	  /** http://msdn.microsoft.com/en-us/library/dd144909(VS.85).aspx */
	  public int GetPixel(Pointer hdc, int nXPos, int nYPos);

	  /** http://msdn.microsoft.com/en-us/library/dd183539(VS.85).aspx */
	  public boolean DeleteObject(Pointer hObject);

	  /** http://msdn.microsoft.com/en-us/library/dd183533(VS.85).aspx */
	  public boolean DeleteDC(Pointer hdc);

	}

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Pointer;

public interface User32 extends Library {

	  public static User32 INSTANCE = (User32) Native
	      .loadLibrary("User32", User32.class);

	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_ARROW = 32512;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_IBEAM = 32513;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_WAIT = 32514;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_CROSS = 32515;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_UPARROW = 32516;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_SIZENWSE = 32642;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_SIZENESW = 32643;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_SIZEWE = 32644;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_SIZENS = 32645;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_SIZEALL = 32646;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_NO = 32648;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_HAND = 32649;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_APPSTARTING = 32650;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_HELP = 32651;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_ICON = 32641;
	  /** @see #LoadCursorW(Pointer, int) */
	  public static final int IDC_SIZE = 32640;

	  /** @see #DrawIconEx(Pointer, int, int, Pointer, int, int, int, Pointer, int) */
	  public static final int DI_COMPAT = 4;
	  /** @see #DrawIconEx(Pointer, int, int, Pointer, int, int, int, Pointer, int) */
	  public static final int DI_DEFAULTSIZE = 8;
	  /** @see #DrawIconEx(Pointer, int, int, Pointer, int, int, int, Pointer, int) */
	  public static final int DI_IMAGE = 2;
	  /** @see #DrawIconEx(Pointer, int, int, Pointer, int, int, int, Pointer, int) */
	  public static final int DI_MASK = 1;
	  /** @see #DrawIconEx(Pointer, int, int, Pointer, int, int, int, Pointer, int) */
	  public static final int DI_NORMAL = 3;
	  /** @see #DrawIconEx(Pointer, int, int, Pointer, int, int, int, Pointer, int) */
	  public static final int DI_APPBANDING = 1;

	  /** http://msdn.microsoft.com/en-us/library/ms648391(VS.85).aspx */
	  public Pointer LoadCursorW(Pointer hInstance,
	      int lpCursorName);

	  /** http://msdn.microsoft.com/en-us/library/ms648065(VS.85).aspx */
	  public boolean DrawIconEx(Pointer hdc, int xLeft,
	      int yTop, Pointer hIcon, int cxWidth, int cyWidth,
	      int istepIfAniCur, Pointer hbrFlickerFreeDraw,
	      int diFlags);

	}