support for tracking mouse outside window on drag, new api for checking if mouse is inside window

src/java/org/lwjgl/input/Mouse.java

@@ -33,6 +33,8 @@ package org.lwjgl.input;
 
 import java.nio.ByteBuffer;
 import java.nio.IntBuffer;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -135,6 +137,8 @@ public class Mouse {
 	private static final boolean emulateCursorAnimation = 	LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_WINDOWS || 
 								LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_MACOSX;
 
+        private static final boolean allowNegativeMouseCoords = getPrivilegedBoolean("org.lwjgl.input.Mouse.allowNegativeMouseCoords");
+
 	/**
 	 * Mouse cannot be constructed.
 	 */
@@ -338,9 +342,11 @@ public class Mouse {
 				x = poll_coord1;
 				y = poll_coord2;
 			}
-			x = Math.min(implementation.getWidth() - 1, Math.max(0, x));
-			y = Math.min(implementation.getHeight() - 1, Math.max(0, y));
-			dwheel += poll_dwheel;
+                        if(!allowNegativeMouseCoords) {
+                            x = Math.min(implementation.getWidth() - 1, Math.max(0, x));
+                            y = Math.min(implementation.getHeight() - 1, Math.max(0, y));
+                        }
+                        dwheel += poll_dwheel;
 			read();
 		}
 	}
@@ -634,4 +640,24 @@ public class Mouse {
 			}
 		}
 	}
+
+        /** Gets a boolean property as a privileged action. */
+	static boolean getPrivilegedBoolean(final String property_name) {
+		Boolean value = (Boolean)AccessController.doPrivileged(new PrivilegedAction() {
+			public Object run() {
+				return new Boolean(Boolean.getBoolean(property_name));
+			}
+		});
+		return value.booleanValue();
+	}
+
+        /**
+         * Retrieves whether or not the mouse cursor is within the bounds of the window.
+         * If the mouse cursor was moved outside the display during a drag, then the result of calling
+         * this method will be true until the button is released.
+         * @return true if mouse is inside display, false otherwise.
+         */
+        public static boolean isInsideWindow() {
+            return implementation.isInsideWindow();
+        }
 }

src/java/org/lwjgl/opengl/InputImplementation.java

@@ -129,4 +129,6 @@ public interface InputImplementation {
 	int getWidth();
 
 	int getHeight();
+
+        boolean isInsideWindow();
 }

src/java/org/lwjgl/opengl/LinuxDisplay.java

@@ -1221,4 +1221,8 @@ final class LinuxDisplay implements DisplayImplementation {
 	public int getHeight() {
 		return Display.getDisplayMode().getHeight();
 	}
+
+        public boolean isInsideWindow() {
+            return true;
+        }
 }

src/java/org/lwjgl/opengl/MacOSXDisplay.java

@@ -501,4 +501,8 @@ final class MacOSXDisplay implements DisplayImplementation {
 	public int getHeight() {
 		return Display.getDisplayMode().getHeight();
 	}
+
+        public boolean isInsideWindow() {
+            return true;
+        }
 }

src/java/org/lwjgl/opengl/WindowsDisplay.java

@@ -66,6 +66,7 @@ final class WindowsDisplay implements DisplayImplementation {
 	private final static int WM_MBUTTONDBLCLK                 = 0x0209;
 	private final static int WM_MOUSEWHEEL                    = 0x020A;
 	private final static int WM_CAPTURECHANGED                = 0x0215;
+        private final static int WM_MOUSELEAVE                    = 0x02A3;
 	private final static int WM_KEYDOWN						  = 256;
 	private final static int WM_KEYUP						  = 257;
 	private final static int WM_SYSKEYUP					  = 261;
@@ -154,6 +155,8 @@ final class WindowsDisplay implements DisplayImplementation {
 	private long large_icon;
 
 	private int captureMouse = -1;
+        private boolean trackingMouse = false;
+        private boolean mouseInside = false;
 
 	WindowsDisplay() {
 		current_display = this;
@@ -813,6 +816,10 @@ final class WindowsDisplay implements DisplayImplementation {
 				int yPos = transformY(getHwnd(), (int)(short)((lParam >> 16) & 0xFFFF));
 				handleMouseMoved(xPos, yPos, millis);
 				checkCursorState();
+                                mouseInside = true;
+                                if(!trackingMouse) {
+                                    trackingMouse = nTrackMouseEvent(hwnd);
+                                }
 				return 0;
 			case WM_MOUSEWHEEL:
 				int dwheel = (int)(short)((wParam >> 16) & 0xFFFF);
@@ -878,6 +885,10 @@ final class WindowsDisplay implements DisplayImplementation {
 			case WM_PAINT:
 				is_dirty = true;
 				return defWindowProc(hwnd, msg, wParam, lParam);
+                        case WM_MOUSELEAVE:
+                            mouseInside = false;
+                            trackingMouse = false;
+                            return defWindowProc(hwnd, msg, wParam, lParam);
 			case WM_CANCELMODE:
 				nReleaseCapture();
 				/* fall through */
@@ -909,6 +920,12 @@ final class WindowsDisplay implements DisplayImplementation {
 		return -1;
 	}
 
+        private native boolean nTrackMouseEvent(long hwnd);
+
+        public boolean isInsideWindow() {
+            return mouseInside;
+        }
+
 	private static final class Rect {
 		public int top;
 		public int bottom;

src/java/org/lwjgl/test/input/MouseTest.java

@@ -239,7 +239,7 @@ public class MouseTest {
   private void handleMouse() {
   	readBufferedMouse();
   	
-  	Display.setTitle("x: " + Mouse.getX() + ", y: " + Mouse.getY() + ", [0]: " + Mouse.isButtonDown(0) + ", [1]: " + Mouse.isButtonDown(1) + ", [2]: " + Mouse.isButtonDown(2));
+  	  	Display.setTitle("x: " + Mouse.getX() + ", y: " + Mouse.getY() + ", [0]: " + Mouse.isButtonDown(0) + ", [1]: " + Mouse.isButtonDown(1) + ", [2]: " + Mouse.isButtonDown(2) + ", inside: " + Mouse.isInsideWindow());
   }
   
   /**