Attachment 18025 Details for Bug 4147 – Mouse Wheel Emulation Patch take 3

[patch] Mouse Wheel Emulation Patch take 3

0001-Mouse-Wheel-Emulation-Patch-Take-3.patch (text/plain), 12.96 KB, created by Chris Salch on 2008-07-30 22:53:39 UTC

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Creator: Chris Salch

Created: 2008-07-30 22:53:39 UTC

Size: 12.96 KB

patch

obsolete

>From 5e8c84ced462e0a87aaa1011b71ab8e1dcffe081 Mon Sep 17 00:00:00 2001
>From: jules <jules@pixel1.homenet>
>Date: Thu, 31 Jul 2008 00:41:50 -0500
>Subject: [PATCH] Mouse Wheel Emulation Patch Take 3
>
>---
> man/evdev.man   |   44 ++++++++++-
> src/Makefile.am |    4 +-
> src/emuWheel.c  |  252 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> src/evdev.c     |   12 +++
> src/evdev.h     |   18 ++++
> 5 files changed, 328 insertions(+), 2 deletions(-)
> create mode 100644 src/emuWheel.c
>
>diff --git a/man/evdev.man b/man/evdev.man
>index 0a4b71a..3b0f3b1 100644
>--- a/man/evdev.man
>+++ b/man/evdev.man
>@@ -77,7 +77,49 @@ buttons can have the same mapping.
> For example, a left-handed mouse with deactivated scroll-wheel would use a
> mapping of "3 2 1 0 0". Invalid mappings are ignored and the default mapping
> is used. Buttons not specified in the user's mapping use the default mapping.
>-
>+.TP 7
>+.BI "Option \*qEmulateWheel\*q \*q" boolean \*q
>+Enable/disable "wheel" emulation.  Wheel emulation means emulating button
>+press/release events when the mouse is moved while a specific real button
>+is pressed.  Wheel button events (typically buttons 4 and 5) are
>+usually used for scrolling.  Wheel emulation is useful for getting wheel-like
>+behaviour with trackballs.  It can also be useful for mice with 4 or
>+more buttons but no wheel.  See the description of the
>+.BR EmulateWheelButton ,
>+.BR EmulateWheelInertia ,
>+.BR XAxisMapping ,
>+and
>+.B YAxisMapping
>+options below.  Default: off.
>+.TP 7
>+.BI "Option \*qEmulateWheelButton\*q \*q" integer \*q
>+Specifies which button must be held down to enable wheel emulation mode.
>+While this button is down, X and/or Y pointer movement will generate button
>+press/release events as specified for the
>+.B XAxisMapping
>+and
>+.B YAxisMapping
>+settings.  Default: 4.
>+.TP 7
>+.BI "Option \*qEmulateWheelInertia\*q \*q" integer \*q
>+Specifies how far (in pixels) the pointer must move to generate button
>+press/release events in wheel emulation mode.  Default: 10.
>+.TP 7
>+.BI "Option \*qXAxisMapping\*q \*q" "N1 N2" \*q
>+Specifies which buttons are mapped to motion in the X direction in wheel
>+emulation mode.  Button number
>+.I N1
>+is mapped to the negative X axis motion and button number
>+.I N2
>+is mapped to the positive X axis motion.  Default: no mapping.
>+.TP 7
>+.BI "Option \*qYAxisMapping\*q \*q" "N1 N2" \*q
>+Specifies which buttons are mapped to motion in the Y direction in wheel
>+emulation mode.  Button number
>+.I N1
>+is mapped to the negative Y axis motion and button number
>+.I N2
>+is mapped to the positive Y axis motion.  Default: "4 5"
> .SH AUTHORS
> Kristian HÃ¸gsberg.
> .SH "SEE ALSO"
>diff --git a/src/Makefile.am b/src/Makefile.am
>index d0b9b63..e6bb64e 100644
>--- a/src/Makefile.am
>+++ b/src/Makefile.am
>@@ -30,4 +30,6 @@
> 
> @DRIVER_NAME@_drv_la_SOURCES = @DRIVER_NAME@.c \
>                                @DRIVER_NAME@.h \
>-                               emuMB.c
>+                               emuMB.c \
>+                               emuWheel.c
>+
>diff --git a/src/emuWheel.c b/src/emuWheel.c
>new file mode 100644
>index 0000000..21a6f8d
>--- /dev/null
>+++ b/src/emuWheel.c
>@@ -0,0 +1,252 @@
>+/*
>+ * Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany.
>+ * Copyright 1993 by David Dawes <dawes@xfree86.org>
>+ * Copyright 2002 by SuSE Linux AG, Author: Egbert Eich
>+ * Copyright 1994-2002 by The XFree86 Project, Inc.
>+ * Copyright 2002 by Paul Elliott
>+ * (Ported from xf86-input-mouse, above copyrights taken from there)
>+ * Copyright Â© 2008 University of South Australia
>+ *
>+ * Permission to use, copy, modify, distribute, and sell this software
>+ * and its documentation for any purpose is hereby granted without
>+ * fee, provided that the above copyright notice appear in all copies
>+ * and that both that copyright notice and this permission notice
>+ * appear in supporting documentation, and that the name of the authors
>+ * not be used in advertising or publicity pertaining to distribution of the
>+ * software without specific, written prior permission.  The authors make no
>+ * representations about the suitability of this software for any
>+ * purpose.  It is provided "as is" without express or implied
>+ * warranty.
>+ *
>+ * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
>+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
>+ * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
>+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
>+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
>+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
>+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
>+ *
>+ */
>+
>+/* Mouse wheel emulation code. */
>+#ifdef HAVE_CONFIG_H
>+#include "config.h"
>+#endif
>+
>+#include "evdev.h"
>+
>+#define MSE_MAXBUTTONS 32
>+#define WHEEL_NOT_CONFIGURED 0
>+
>+/* Local Funciton Prototypes */
>+static BOOL EvdevWheelEmuHandleButtonMap(InputInfoPtr pInfo, WheelAxisPtr pAxis, char *axis_name);
>+static void EvdevWheelEmuInertia(InputInfoPtr pInfo, WheelAxisPtr axis, int value);
>+
>+/* Filter mouse wheel events */
>+BOOL
>+EvdevWheelEmuFilterEvent(InputInfoPtr pInfo, struct input_event *pEv) 
>+{
>+    EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
>+    WheelAxisPtr pAxis = NULL;
>+    int value = pEv->value;
>+    
>+    /* Would it be better to handle this a two separate function calls? */
>+
>+    /* Handle our motion events */
>+    switch (pEv->type) {
>+    case EV_REL:
>+	if(pEvdev->emulateWheel.button_state) {
>+	    /* We don't want to intercept real mouse wheel events */
>+	    switch(pEv->code) {
>+	    case REL_X:
>+		pAxis = &(pEvdev->emulateWheel.X);
>+		break;
>+
>+	    case REL_Y:
>+		pAxis = &(pEvdev->emulateWheel.Y);
>+		break;
>+
>+	    default:
>+		break;
>+	    }
>+	}
>+
>+	break;
>+
>+    case EV_ABS:
>+	break;
>+
>+    case EV_KEY:
>+	/* Check for EmulateWheelButton */
>+	if((pEv->code - BTN_LEFT + 5) == pEvdev->emulateWheel.button) {
>+	    pEvdev->emulateWheel.button_state = value;
>+	    return TRUE;
>+	}
>+	    
>+	break;
>+    }
>+
>+    /* if we set an axix, mouse wheel emulation is active */
>+    if(pAxis) {
>+	EvdevWheelEmuInertia(pInfo, pAxis, value);
>+	return TRUE;
>+    }
>+    
>+    return FALSE;
>+}
>+
>+/* Simulate inertia for our emulated mouse wheel */
>+static void
>+EvdevWheelEmuInertia(InputInfoPtr pInfo, WheelAxisPtr axis, int value)
>+{
>+    EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
>+    int button;
>+    int inertia;
>+
>+    /* if this axis has not been configured, just eat the motion */
>+    if(!axis->up_button) {
>+	return;
>+    }
>+
>+    axis->traveled_distance += value;
>+
>+    if(axis->traveled_distance < 0) {
>+	button = axis->up_button;
>+	inertia = -pEvdev->emulateWheel.inertia;
>+    } else {
>+	button = axis->down_button;
>+	inertia = pEvdev->emulateWheel.inertia;
>+    }
>+
>+    /* Produce button press events for wheel motion */
>+    while(abs(axis->traveled_distance) > pEvdev->emulateWheel.inertia) {
>+
>+	axis->traveled_distance -= inertia;
>+	xf86PostButtonEvent(pInfo->dev, 0, button, 1, 0, 0); 
>+	xf86PostButtonEvent(pInfo->dev, 0, button, 0, 0, 0); 
>+    }
>+}
>+
>+/* Handle button mapping here to avoid code duplication,
>+   returns true if a button mapping was found. */
>+static BOOL
>+EvdevWheelEmuHandleButtonMap(InputInfoPtr pInfo, WheelAxisPtr pAxis, char* axis_name)
>+{
>+    EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
>+    char *option_string;
>+
>+    pAxis->up_button = WHEEL_NOT_CONFIGURED;
>+
>+    /* Check to see if there is configuration for this axis */
>+    option_string = xf86SetStrOption(pInfo->options, axis_name, NULL);
>+    if(option_string) {
>+	int up_button = 0;
>+	int down_button = 0;
>+	char *msg = NULL;
>+
>+	if((sscanf(option_string, "%d %d", &up_button, &down_button) == 2) &&
>+	   ((up_button > 0) && (up_button <= MSE_MAXBUTTONS)) &&
>+	   ((down_button > 0) && (down_button <= MSE_MAXBUTTONS))) {
>+
>+	    /* Use xstrdup to allocate a string for us */
>+	    msg = xstrdup("buttons XX and YY");
>+
>+	    if(msg) {
>+		sprintf(msg, "buttons %d and %d", up_button, down_button);
>+	    }
>+
>+	    pAxis->up_button=up_button;
>+	    pAxis->down_button=down_button;
>+        
>+	    /* Update the number of buttons if needed */
>+	    if(up_button > pEvdev->buttons) pEvdev->buttons=up_button;
>+	    if(down_button > pEvdev->buttons) pEvdev->buttons=down_button;
>+
>+	} else {
>+	    xf86Msg(X_WARNING, "%s: Invalid %s value:\"%s\"\n",
>+		    pInfo->name, axis_name, option_string);
>+
>+	}
>+
>+	/* Clean up and log what happened */
>+	if(msg) {
>+	    xf86Msg(X_CONFIG, "%s: %s: %s\n",pInfo->name, axis_name, msg);
>+	    xfree(msg);
>+	    return TRUE;
>+	}
>+    }
>+    return FALSE;
>+}
>+
>+/* Setup the basic configuration options used by mouse wheel emulation */
>+void 
>+EvdevWheelEmuPreInit(InputInfoPtr pInfo)
>+{
>+    EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
>+    pEvdev->emulateWheel.enabled = FALSE;
>+
>+    if(xf86SetBoolOption(pInfo->options, "EmulateWheel", FALSE)) {
>+	Bool yFromConfig = FALSE;
>+	int wheelButton;
>+	int inertia;
>+
>+	pEvdev->emulateWheel.enabled = TRUE;
>+	wheelButton = xf86SetIntOption(pInfo->options, 
>+				       "EmulateWheelButton", 4);
>+
>+	if((wheelButton < 0) || (wheelButton > MSE_MAXBUTTONS)) {
>+	    xf86Msg(X_WARNING, "%s: Invalid EmulateWheelButton value: %d\n",
>+		    pInfo->name, wheelButton);
>+
>+	    wheelButton = 4;
>+	}
>+
>+	pEvdev->emulateWheel.button = wheelButton;
>+    
>+	inertia = xf86SetIntOption(pInfo->options, "EmulateWheelInertia", 10);
>+
>+	if(inertia <= 0) {
>+	    xf86Msg(X_WARNING, "%s: Invalid EmulateWheelInertia value: %d\n",
>+		    pInfo->name, inertia);
>+
>+	    inertia = 10;
>+	}
>+    
>+	pEvdev->emulateWheel.inertia = inertia;
>+
>+	/* Configure the Y axis or default it */
>+	if(!EvdevWheelEmuHandleButtonMap(pInfo, &(pEvdev->emulateWheel.Y), 
>+					 "YAxisMapping")) {
>+	    /* Default the Y axis to sane values */
>+	    pEvdev->emulateWheel.Y.up_button = 4;
>+	    pEvdev->emulateWheel.Y.down_button = 5;
>+
>+	    /* Simpler to check just the largest value in this case */
>+	    if(5 > pEvdev->buttons) {
>+		pEvdev->buttons=5;
>+	    }
>+
>+	    /* Display default Configuration */
>+	    xf86Msg(X_CONFIG, "%s: YAxisMapping: buttons %d and %d\n",
>+		    pInfo->name, pEvdev->emulateWheel.Y.up_button,
>+		    pEvdev->emulateWheel.Y.down_button);
>+	}
>+    
>+
>+	/* This axis should default to an unconfigured state as most people
>+	   are not going to expect a Horizontal wheel. */
>+	EvdevWheelEmuHandleButtonMap(pInfo, &(pEvdev->emulateWheel.X),
>+				     "XAxisMapping");
>+	/*
>+	  pEvdev->emulateWheel.X.up_button = 6;
>+	  pEvdev->emulateWheel.X.down_button = 7;*/
>+
>+	/* Used by the inertia code */
>+	pEvdev->emulateWheel.X.traveled_distance = 0;
>+	pEvdev->emulateWheel.Y.traveled_distance = 0;
>+    
>+	xf86Msg(X_CONFIG, "%s: EmulateWheelButton: %d, EmulateWheelInertia: %d\n",
>+		pInfo->name, pEvdev->emulateWheel.button, inertia);
>+    }
>+}
>+
>diff --git a/src/evdev.c b/src/evdev.c
>index dc8f78d..7704f2b 100644
>--- a/src/evdev.c
>+++ b/src/evdev.c
>@@ -206,11 +206,16 @@ EvdevReadInput(InputInfoPtr pInfo)
>             break;
>         }
> 
>+
>         /* Get the signed value, earlier kernels had this as unsigned */
>         value = ev.value;
> 
>         switch (ev.type) {
> 	case EV_REL:
>+	    /* Handle mouse wheel emulation */
>+	    if(EvdevWheelEmuFilterEvent(pInfo, &ev))
>+		break;
>+
>             switch (ev.code) {
>             case REL_X:
>                 dx += value;
>@@ -256,6 +261,10 @@ EvdevReadInput(InputInfoPtr pInfo)
> 		if (value == 2)
> 		    break;
> 
>+	    /* Handle mouse wheel emulation */
>+	    if(EvdevWheelEmuFilterEvent(pInfo, &ev))
>+		break;
>+
>             switch (ev.code) {
> 	    /* swap here, pretend we're an X-conformant device. */
>             case BTN_LEFT:
>@@ -957,7 +966,10 @@ EvdevProc(DeviceIntPtr device, int what)
>         {
>             xf86AddEnabledDevice(pInfo);
>             if (pEvdev->flags & EVDEV_BUTTON_EVENTS)
>+            {
>                 EvdevMBEmuPreInit(pInfo);
>+                EvdevWheelEmuPreInit(pInfo);
>+            }
>             device->public.on = TRUE;
>         }
> 	break;
>diff --git a/src/evdev.h b/src/evdev.h
>index bc79287..df610cf 100644
>--- a/src/evdev.h
>+++ b/src/evdev.h
>@@ -40,6 +40,13 @@
> #include <X11/extensions/XKBstr.h>
> #endif
> 
>+/* axis specific data for wheel emulation */
>+typedef struct {
>+    int up_button;
>+    int down_button;
>+    int traveled_distance;
>+} WheelAxis, *WheelAxisPtr;
>+
> typedef struct {
>     int kernel24;
>     int screen;
>@@ -68,6 +75,14 @@ typedef struct {
>         Time                expires;     /* time of expiry */
>         Time                timeout;
>     } emulateMB;
>+     struct {
>+        BOOL                enabled;
>+        int                 button;
>+        int                 button_state;
>+        int                 inertia;
>+        WheelAxis           X;
>+        WheelAxis           Y;
>+     } emulateWheel;
> 
>     unsigned char btnmap[32];           /* config-file specified button mapping */
> } EvdevRec, *EvdevPtr;
>@@ -86,4 +101,7 @@ Atom EvdevMBEmuInitPropertyTimeout(DeviceIntPtr, char*);
> BOOL EvdevMBEmuSetProperty(DeviceIntPtr, Atom, XIPropertyValuePtr);
> #endif
> 
>+/* Mouse Wheel emulation */
>+void EvdevWheelEmuPreInit(InputInfoPtr pInfo);
>+BOOL EvdevWheelEmuFilterEvent(InputInfoPtr pInfo, struct input_event *pEv);
> #endif
>-- 
>1.5.6.3
>

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