dix: move Enter-Leave related functions into new enterleave.c

Preparation for the new core enter/leave model.

Signed-off-by: Peter Hutterer <peter.hutterer@redhat.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/dix/enterleave.c b/dix/enterleave.c
new file mode 100644
index 000000000..941aa528a
--- /dev/null
+++ b/dix/enterleave.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright © 2008 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Peter Hutterer
+ *
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+#include "windowstr.h"
+#include "enterleave.h"
+
+/**
+ * @return The window that is the first ancestor of both a and b.
+ */
+WindowPtr
+CommonAncestor(
+    WindowPtr a,
+    WindowPtr b)
+{
+    for (b = b->parent; b; b = b->parent)
+	if (IsParent(b, a)) return b;
+    return NullWindow;
+}
+
+
+/**
+ * Send enter notifies to all parent windows up to ancestor.
+ * This function recurses.
+ */
+static void
+EnterNotifies(DeviceIntPtr pDev,
+              WindowPtr ancestor,
+              WindowPtr child,
+              int mode,
+              int detail)
+{
+    WindowPtr	parent = child->parent;
+
+    if (ancestor == parent)
+	return;
+    EnterNotifies(pDev, ancestor, parent, mode, detail);
+    EnterLeaveEvent(pDev, EnterNotify, mode, detail, parent,
+                    child->drawable.id);
+}
+
+
+/**
+ * Send leave notifies to all parent windows up to ancestor.
+ * This function recurses.
+ */
+static void
+LeaveNotifies(DeviceIntPtr pDev,
+              WindowPtr child,
+              WindowPtr ancestor,
+              int mode,
+              int detail)
+{
+    WindowPtr  pWin;
+
+    if (ancestor == child)
+	return;
+    for (pWin = child->parent; pWin != ancestor; pWin = pWin->parent)
+    {
+        EnterLeaveEvent(pDev, LeaveNotify, mode, detail, pWin,
+                        child->drawable.id);
+        child = pWin;
+    }
+}
+
+/**
+ * Figure out if enter/leave events are necessary and send them to the
+ * appropriate windows.
+ *
+ * @param fromWin Window the sprite moved out of.
+ * @param toWin Window the sprite moved into.
+ */
+void
+DoEnterLeaveEvents(DeviceIntPtr pDev,
+        WindowPtr fromWin,
+        WindowPtr toWin,
+        int mode)
+{
+    if (!IsPointerDevice(pDev))
+        return;
+
+    if (fromWin == toWin)
+	return;
+    if (IsParent(fromWin, toWin))
+    {
+        EnterLeaveEvent(pDev, LeaveNotify, mode, NotifyInferior, fromWin,
+                        None);
+        EnterNotifies(pDev, fromWin, toWin, mode,
+                      NotifyVirtual);
+        EnterLeaveEvent(pDev, EnterNotify, mode, NotifyAncestor, toWin, None);
+    }
+    else if (IsParent(toWin, fromWin))
+    {
+	EnterLeaveEvent(pDev, LeaveNotify, mode, NotifyAncestor, fromWin,
+                        None);
+	LeaveNotifies(pDev, fromWin, toWin, mode, NotifyVirtual);
+	EnterLeaveEvent(pDev, EnterNotify, mode, NotifyInferior, toWin, None);
+    }
+    else
+    { /* neither fromWin nor toWin is descendent of the other */
+	WindowPtr common = CommonAncestor(toWin, fromWin);
+	/* common == NullWindow ==> different screens */
+        EnterLeaveEvent(pDev, LeaveNotify, mode, NotifyNonlinear, fromWin,
+                        None);
+        LeaveNotifies(pDev, fromWin, common, mode, NotifyNonlinearVirtual);
+	EnterNotifies(pDev, common, toWin, mode, NotifyNonlinearVirtual);
+        EnterLeaveEvent(pDev, EnterNotify, mode, NotifyNonlinear, toWin,
+                        None);
+    }
+}
+