Patch: FYI: Implement getMousePosition

[Thomas Fitzsimmons <fitzsim at redhat dot com>]

Hi,

I back-ported this patch from GNU Classpath to implement 
Component.getMousePosition() and Container.getMousePosition(boolean).

Tested with "make check-target-libjava" on x86 and x86_64.

Tom

2007-12-05  Thomas Fitzsimmons  <fitzsim@redhat.com>

	* gnu/java/awt/peer/gtk/GdkGraphicsEnvironment.java,
	native/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.c
	(isWindowUnderMouse): New method.
	* include/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.h:
	Regenerate.
	* gnu/java/awt/peer/gtk/GtkComponentPeer.java
	(getLocationOnScreen): Move WindowPeer section to...
	* gnu/java/awt/peer/gtk/GtkWindowPeer.java (getLocationOnScreen):
	New method.
	* gnu/java/awt/peer/gtk/GtkMouseInfoPeer.java
	(isWindowUnderMouse): Implement.
	* java/awt/Component.java (getMousePosition): New method.
	(getMousePositionHelper): Likewise.
	(mouseOverComponent): Likewise.
	* java/awt/Container.java (getMousePosition): New method.
	(mouseOverComponent): Likewise.
	* classpath/lib/java/awt/Component.class,
	classpath/lib/java/awt/Component$BltBufferStrategy.class,
	classpath/lib/java/awt/Container$GfxPaintAllVisitor.class,
	classpath/lib/java/awt/Component$AccessibleAWTComponent
	$AccessibleAWTFocusHandler.class,
	classpath/lib/java/awt/Component$FlipBufferStrategy.class,
	classpath/lib/java/awt/Container$GfxVisitor.class,
	classpath/lib/java/awt/Component$AccessibleAWTComponent
	$AccessibleAWTComponentHandler.class,
	classpath/lib/java/awt/Container$AccessibleAWTContainer
	$AccessibleContainerHandler.class,
	classpath/lib/java/awt/Container.class,
	classpath/lib/java/awt/Container$AccessibleAWTContainer.class,
	classpath/lib/java/awt/Container$GfxPrintAllVisitor.class,
	classpath/lib/java/awt/Component$AccessibleAWTComponent.class,
	classpath/lib/java/awt/Container$GfxPaintVisitor.class,
	classpath/lib/java/awt/Container$GfxPrintVisitor.class,
	classpath/lib/java/awt/Component$HeavyweightInLightweightListener.class,
	classpath/lib/gnu/java/awt/peer/gtk/GtkComponentPeer.class,
	classpath/lib/gnu/java/awt/peer/gtk/GdkGraphicsEnvironment.class,
	classpath/lib/gnu/java/awt/peer/gtk/GtkMouseInfoPeer.class,
	classpath/lib/gnu/java/awt/peer/gtk/GtkWindowPeer.class,
	classpath/lib/gnu/java/awt/peer/gtk/GtkComponentPeer
	$RepaintTimerTask.class:
	Regenerate.

2007-12-05  Thomas Fitzsimmons  <fitzsim@redhat.com>

	* gnu/java/awt/peer/gtk/GdkGraphicsEnvironment.h: Regenerate.
	* gnu/java/awt/peer/gtk/GtkWindowPeer.h: Likewise.
	* java/awt/Component.h: Likewise.
	* java/awt/Container.h: Likewise.

Index: classpath/native/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.c
===================================================================
--- classpath/native/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.c	(revision 130589)
+++ classpath/native/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.c	(working copy)
@@ -263,3 +263,37 @@
 
   return retArray;
 }
+
+JNIEXPORT jboolean JNICALL
+Java_gnu_java_awt_peer_gtk_GdkGraphicsEnvironment_isWindowUnderMouse
+(JNIEnv *env, jobject obj, jobject windowPeer)
+{
+  GdkDisplay *display = NULL;
+  gint x = 0;
+  gint y = 0;
+  GtkWidget *windowToTest = NULL;
+  GdkWindow *windowAtPointer = NULL;
+  jboolean retVal = JNI_FALSE;
+
+  display = (GdkDisplay *) gtkpeer_get_display (env, obj);
+  g_assert (display != NULL);
+
+  windowToTest = (GtkWidget *) gtkpeer_get_widget (env, windowPeer);
+
+  gdk_threads_enter ();
+
+  windowAtPointer = gdk_display_get_window_at_pointer (display, &x, &y);
+
+  while (windowAtPointer
+         && windowAtPointer != windowToTest->window)
+    windowAtPointer = gdk_window_get_parent (windowAtPointer);
+
+  gdk_threads_leave ();
+
+  if (windowAtPointer)
+    retVal = JNI_TRUE;
+  else
+    retVal = JNI_FALSE;
+
+  return retVal;
+}
Index: classpath/gnu/java/awt/peer/gtk/GdkGraphicsEnvironment.java
===================================================================
--- classpath/gnu/java/awt/peer/gtk/GdkGraphicsEnvironment.java	(revision 130589)
+++ classpath/gnu/java/awt/peer/gtk/GdkGraphicsEnvironment.java	(working copy)
@@ -155,6 +155,7 @@
    * Used by GtkMouseInfoPeer.
    */ 
   native int[] getMouseCoordinates();
+  native boolean isWindowUnderMouse(GtkWindowPeer windowPeer);
   
   public WritableRaster createRaster(ColorModel cm, SampleModel sm)
   {
Index: classpath/gnu/java/awt/peer/gtk/GtkComponentPeer.java
===================================================================
--- classpath/gnu/java/awt/peer/gtk/GtkComponentPeer.java	(revision 130589)
+++ classpath/gnu/java/awt/peer/gtk/GtkComponentPeer.java	(working copy)
@@ -76,7 +76,6 @@
 import java.awt.peer.ComponentPeer;
 import java.awt.peer.ContainerPeer;
 import java.awt.peer.LightweightPeer;
-import java.awt.peer.WindowPeer;
 import java.util.Timer;
 import java.util.TimerTask;
 
@@ -251,10 +250,7 @@
   public Point getLocationOnScreen () 
   { 
     int point[] = new int[2];
-    if( this instanceof WindowPeer )
-      gtkWindowGetLocationOnScreen (point);
-    else
-      gtkWidgetGetLocationOnScreen (point);
+    gtkWidgetGetLocationOnScreen (point);
     return new Point (point[0], point[1]);
   }
 
Index: classpath/gnu/java/awt/peer/gtk/GtkWindowPeer.java
===================================================================
--- classpath/gnu/java/awt/peer/gtk/GtkWindowPeer.java	(revision 130589)
+++ classpath/gnu/java/awt/peer/gtk/GtkWindowPeer.java	(working copy)
@@ -45,6 +45,7 @@
 import java.awt.Frame;
 import java.awt.Graphics;
 import java.awt.KeyboardFocusManager;
+import java.awt.Point;
 import java.awt.Rectangle;
 import java.awt.Window;
 import java.awt.event.ComponentEvent;
@@ -392,6 +393,13 @@
                           clickCount, popupTrigger);
   }
 
+  public Point getLocationOnScreen()
+  {
+    int point[] = new int[2];
+    gtkWindowGetLocationOnScreen(point);
+    return new Point(point[0], point[1]);
+  }
+
   // We override this to keep it in sync with our internal
   // representation.
   public Rectangle getBounds()
Index: classpath/gnu/java/awt/peer/gtk/GtkMouseInfoPeer.java
===================================================================
--- classpath/gnu/java/awt/peer/gtk/GtkMouseInfoPeer.java	(revision 130589)
+++ classpath/gnu/java/awt/peer/gtk/GtkMouseInfoPeer.java	(working copy)
@@ -60,17 +60,7 @@
   
   public boolean isWindowUnderMouse(Window w)
   {
-    int[] coords = gde.getMouseCoordinates();
-    GraphicsDevice[] gds = gde.getScreenDevices();
-
-    // Check if the screen  of the Window and the cursor match
-    if( gds[ coords[0] ] != w.getGraphicsConfiguration().getDevice() )
-      return false;
-
-    // Return the bounds-check.
-    Point p = w.getLocationOnScreen();
-    return (coords[1] >= p.x && coords[1] < p.x + w.getWidth() &&
-	    coords[2] >= p.y && coords[2] < p.y + w.getHeight() );
-    }
+    return gde.isWindowUnderMouse((GtkWindowPeer) w.getPeer());
+  }
 }
 
Index: classpath/java/awt/Container.java
===================================================================
--- classpath/java/awt/Container.java	(revision 130589)
+++ classpath/java/awt/Container.java	(working copy)
@@ -1098,6 +1098,33 @@
   }
 
   /**
+   * Returns the mouse pointer position relative to this Container's
+   * top-left corner.  If allowChildren is false, the mouse pointer
+   * must be directly over this container.  If allowChildren is true,
+   * the mouse pointer may be over this container or any of its
+   * descendents.
+   *
+   * @param allowChildren true to allow descendents, false if pointer
+   * must be directly over Container.
+   *
+   * @return relative mouse pointer position
+   *
+   * @throws HeadlessException if in a headless environment
+   */
+  public Point getMousePosition(boolean allowChildren) throws HeadlessException
+  {
+    return super.getMousePositionHelper(allowChildren);
+  }
+
+  boolean mouseOverComponent(Component component, boolean allowChildren)
+  {
+    if (allowChildren)
+      return isAncestorOf(component);
+    else
+      return component == this;
+  }
+
+  /**
    * Returns the component located at the specified point.  This is done
    * by checking whether or not a child component claims to contain this
    * point.  The first child component that does is returned.  If no
Index: classpath/java/awt/Component.java
===================================================================
--- classpath/java/awt/Component.java	(revision 130589)
+++ classpath/java/awt/Component.java	(working copy)
@@ -5834,6 +5834,62 @@
   }
 
   /**
+   * Returns the mouse pointer position relative to this Component's
+   * top-left corner.
+   *
+   * @return relative mouse pointer position
+   *
+   * @throws HeadlessException if in a headless environment
+   */
+  public Point getMousePosition() throws HeadlessException
+  {
+    return getMousePositionHelper(true);
+  }
+
+  Point getMousePositionHelper(boolean allowChildren) throws HeadlessException
+  {
+    if (GraphicsEnvironment.isHeadless())
+      throw new HeadlessException("can't get mouse position"
+                                  + " in headless environment");
+    if (!isShowing())
+      return null;
+
+    Component parent = this;
+    int windowRelativeXOffset = 0;
+    int windowRelativeYOffset = 0;
+    while (parent != null && !(parent instanceof Window))
+      {
+        windowRelativeXOffset += parent.getX();
+        windowRelativeYOffset += parent.getY();
+        parent = parent.getParent();
+      }
+    if (parent == null)
+      return null;
+
+    Window window = (Window) parent;
+    if (!Toolkit.getDefaultToolkit()
+        .getMouseInfoPeer().isWindowUnderMouse(window))
+      return null;
+
+    PointerInfo info = MouseInfo.getPointerInfo();
+    Point mouseLocation = info.getLocation();
+    Point windowLocation = window.getLocationOnScreen();
+
+    int x = mouseLocation.x - windowLocation.x;
+    int y = mouseLocation.y - windowLocation.y;
+
+    if (!mouseOverComponent(window.getComponentAt(x, y), allowChildren))
+      return null;
+
+    return new Point(x - windowRelativeXOffset, y - windowRelativeYOffset);
+  }
+
+  boolean mouseOverComponent(Component component, boolean allowChildren)
+  {
+    return component == this;
+  }
+
+  /**
    * This method is used to implement transferFocus(). CHILD is the child
    * making the request. This is overridden by Container; when called for an
    * ordinary component there is no child and so we always return null.
Index: classpath/include/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.h
===================================================================
--- classpath/include/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.h	(revision 130589)
+++ classpath/include/gnu_java_awt_peer_gtk_GdkGraphicsEnvironment.h	(working copy)
@@ -1,10 +1,10 @@
 /* DO NOT EDIT THIS FILE - it is machine generated */
 
+#include <jni.h>
+
 #ifndef __gnu_java_awt_peer_gtk_GdkGraphicsEnvironment__
 #define __gnu_java_awt_peer_gtk_GdkGraphicsEnvironment__
 
-#include <jni.h>
-
 #ifdef __cplusplus
 extern "C"
 {
@@ -17,6 +17,7 @@
 JNIEXPORT jint JNICALL Java_gnu_java_awt_peer_gtk_GdkGraphicsEnvironment_nativeGetNumFontFamilies (JNIEnv *env, jobject);
 JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkGraphicsEnvironment_nativeGetFontFamilies (JNIEnv *env, jobject, jobjectArray);
 JNIEXPORT jintArray JNICALL Java_gnu_java_awt_peer_gtk_GdkGraphicsEnvironment_getMouseCoordinates (JNIEnv *env, jobject);
+JNIEXPORT jboolean JNICALL Java_gnu_java_awt_peer_gtk_GdkGraphicsEnvironment_isWindowUnderMouse (JNIEnv *env, jobject, jobject);
 
 #ifdef __cplusplus
 }