1 files changed, 114 insertions, 0 deletions
diff --git a/hw/xwin/wmutil/mouse.c b/hw/xwin/wmutil/mouse.c
new file mode 100644
index 000000000..4c96d9cdd
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+++ b/hw/xwin/wmutil/mouse.c
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+/*
+ *Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
+ *
+ *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 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 XFREE86 PROJECT 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.
+ *
+ *Except as contained in this notice, the name of the XFree86 Project
+ *shall not be used in advertising or otherwise to promote the sale, use
+ *or other dealings in this Software without prior written authorization
+ *from the XFree86 Project.
+ *
+ * Authors:	Dakshinamurthy Karra
+ *		Suhaib M Siddiqi
+ *		Peter Busch
+ *		Harold L Hunt II
+ */
+
+#ifdef HAVE_XWIN_CONFIG_H
+#include <xwin-config.h>
+#endif
+
+#include <X11/Xwindows.h>
+#include <X11/X.h>
+
+#include "mouse.h"
+
+/* Handle the mouse wheel */
+void
+winMouseWheel(int *iTotalDeltaZ, int iDeltaZ)
+{
+    int button;                 /* Button4 or Button5 */
+
+    /* Button4 = WheelUp */
+    /* Button5 = WheelDown */
+
+    /* Do we have any previous delta stored? */
+    if (((*iTotalDeltaZ) > 0 && iDeltaZ > 0)
+        || ((*iTotalDeltaZ) < 0 && iDeltaZ < 0)) {
+        /* Previous delta and of same sign as current delta */
+        iDeltaZ += (*iTotalDeltaZ);
+        (*iTotalDeltaZ) = 0;
+    }
+    else {
+        /*
+         * Previous delta of different sign, or zero.
+         * We will set it to zero for either case,
+         * as blindly setting takes just as much time
+         * as checking, then setting if necessary :)
+         */
+        (*iTotalDeltaZ) = 0;
+    }
+
+    /*
+     * Only process this message if the wheel has moved further than
+     * WHEEL_DELTA
+     */
+    if (iDeltaZ >= WHEEL_DELTA || (-1 * iDeltaZ) >= WHEEL_DELTA) {
+        (*iTotalDeltaZ) = 0;
+
+        /* Figure out how many whole deltas of the wheel we have */
+        iDeltaZ /= WHEEL_DELTA;
+    }
+    else {
+        /*
+         * Wheel has not moved past WHEEL_DELTA threshold;
+         * we will store the wheel delta until the threshold
+         * has been reached.
+         */
+        (*iTotalDeltaZ) = iDeltaZ;
+        return;
+    }
+
+    /* Set the button to indicate up or down wheel delta */
+    if (iDeltaZ > 0) {
+        button = Button4;
+    }
+    else {
+        button = Button5;
+    }
+
+    /*
+     * Flip iDeltaZ to positive, if negative,
+     * because always need to generate a *positive* number of
+     * button clicks for the Z axis.
+     */
+    if (iDeltaZ < 0) {
+        iDeltaZ *= -1;
+    }
+
+    /* Generate X input messages for each wheel delta we have seen */
+    while (iDeltaZ--) {
+        /* Push the wheel button */
+        winMouseButtonsSendEvent(TRUE, button);
+
+        /* Release the wheel button */
+        winMouseButtonsSendEvent(FALSE, button);
+    }
+}