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author | Peter Hutterer <peter@cs.unisa.edu.au> | 2008-06-10 15:55:40 +0930 |
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committer | Peter Hutterer <peter@cs.unisa.edu.au> | 2008-06-10 22:46:20 +0930 |
commit | e8887435ac065ec3071b2d8bf0895e8cb196ec3d (patch) | |
tree | 22fea9071a9c4ca8e6c61e6bffbe463508365899 /src/emuMB.c | |
parent | b0f6987ee6b133e28f3af18da62cfb5ca79fbe07 (diff) | |
download | xorg-driver-xf86-input-evdev-e8887435ac065ec3071b2d8bf0895e8cb196ec3d.tar.gz |
Enable middle-mouse button emulation.
Ported from xf86-input-mouse, with a few cleanups.
Diffstat (limited to 'src/emuMB.c')
-rw-r--r-- | src/emuMB.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/src/emuMB.c b/src/emuMB.c new file mode 100644 index 0000000..2855632 --- /dev/null +++ b/src/emuMB.c @@ -0,0 +1,308 @@ +/* + * 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 © 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 Red Hat + * not be used in advertising or publicity pertaining to distribution + * of the software without specific, written prior permission. Red + * Hat makes 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. + * + */ + +/* Middle mouse button emulation code. */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "evdev.h" + +/* + * Lets create a simple finite-state machine for 3 button emulation: + * + * We track buttons 1 and 3 (left and right). There are 11 states: + * 0 ground - initial state + * 1 delayed left - left pressed, waiting for right + * 2 delayed right - right pressed, waiting for left + * 3 pressed middle - right and left pressed, emulated middle sent + * 4 pressed left - left pressed and sent + * 5 pressed right - right pressed and sent + * 6 released left - left released after emulated middle + * 7 released right - right released after emulated middle + * 8 repressed left - left pressed after released left + * 9 repressed right - right pressed after released right + * 10 pressed both - both pressed, not emulating middle + * + * At each state, we need handlers for the following events + * 0: no buttons down + * 1: left button down + * 2: right button down + * 3: both buttons down + * 4: emulate3Timeout passed without a button change + * Note that button events are not deltas, they are the set of buttons being + * pressed now. It's possible (ie, mouse hardware does it) to go from (eg) + * left down to right down without anything in between, so all cases must be + * handled. + * + * a handler consists of three values: + * 0: action1 + * 1: action2 + * 2: new emulation state + * + * action > 0: ButtonPress + * action = 0: nothing + * action < 0: ButtonRelease + * + * The comment preceeding each section is the current emulation state. + * The comments to the right are of the form + * <button state> (<events>) -> <new emulation state> + * which should be read as + * If the buttons are in <button state>, generate <events> then go to + * <new emulation state>. + */ +static signed char stateTab[11][5][3] = { +/* 0 ground */ + { + { 0, 0, 0 }, /* nothing -> ground (no change) */ + { 0, 0, 1 }, /* left -> delayed left */ + { 0, 0, 2 }, /* right -> delayed right */ + { 2, 0, 3 }, /* left & right (middle press) -> pressed middle */ + { 0, 0, -1 } /* timeout N/A */ + }, +/* 1 delayed left */ + { + { 1, -1, 0 }, /* nothing (left event) -> ground */ + { 0, 0, 1 }, /* left -> delayed left (no change) */ + { 1, -1, 2 }, /* right (left event) -> delayed right */ + { 2, 0, 3 }, /* left & right (middle press) -> pressed middle */ + { 1, 0, 4 }, /* timeout (left press) -> pressed left */ + }, +/* 2 delayed right */ + { + { 3, -3, 0 }, /* nothing (right event) -> ground */ + { 3, -3, 1 }, /* left (right event) -> delayed left (no change) */ + { 0, 0, 2 }, /* right -> delayed right (no change) */ + { 2, 0, 3 }, /* left & right (middle press) -> pressed middle */ + { 3, 0, 5 }, /* timeout (right press) -> pressed right */ + }, +/* 3 pressed middle */ + { + { -2, 0, 0 }, /* nothing (middle release) -> ground */ + { 0, 0, 7 }, /* left -> released right */ + { 0, 0, 6 }, /* right -> released left */ + { 0, 0, 3 }, /* left & right -> pressed middle (no change) */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 4 pressed left */ + { + { -1, 0, 0 }, /* nothing (left release) -> ground */ + { 0, 0, 4 }, /* left -> pressed left (no change) */ + { -1, 0, 2 }, /* right (left release) -> delayed right */ + { 3, 0, 10 }, /* left & right (right press) -> pressed both */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 5 pressed right */ + { + { -3, 0, 0 }, /* nothing (right release) -> ground */ + { -3, 0, 1 }, /* left (right release) -> delayed left */ + { 0, 0, 5 }, /* right -> pressed right (no change) */ + { 1, 0, 10 }, /* left & right (left press) -> pressed both */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 6 released left */ + { + { -2, 0, 0 }, /* nothing (middle release) -> ground */ + { -2, 0, 1 }, /* left (middle release) -> delayed left */ + { 0, 0, 6 }, /* right -> released left (no change) */ + { 1, 0, 8 }, /* left & right (left press) -> repressed left */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 7 released right */ + { + { -2, 0, 0 }, /* nothing (middle release) -> ground */ + { 0, 0, 7 }, /* left -> released right (no change) */ + { -2, 0, 2 }, /* right (middle release) -> delayed right */ + { 3, 0, 9 }, /* left & right (right press) -> repressed right */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 8 repressed left */ + { + { -2, -1, 0 }, /* nothing (middle release, left release) -> ground */ + { -2, 0, 4 }, /* left (middle release) -> pressed left */ + { -1, 0, 6 }, /* right (left release) -> released left */ + { 0, 0, 8 }, /* left & right -> repressed left (no change) */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 9 repressed right */ + { + { -2, -3, 0 }, /* nothing (middle release, right release) -> ground */ + { -3, 0, 7 }, /* left (right release) -> released right */ + { -2, 0, 5 }, /* right (middle release) -> pressed right */ + { 0, 0, 9 }, /* left & right -> repressed right (no change) */ + { 0, 0, -1 }, /* timeout N/A */ + }, +/* 10 pressed both */ + { + { -1, -3, 0 }, /* nothing (left release, right release) -> ground */ + { -3, 0, 4 }, /* left (right release) -> pressed left */ + { -1, 0, 5 }, /* right (left release) -> pressed right */ + { 0, 0, 10 }, /* left & right -> pressed both (no change) */ + { 0, 0, -1 }, /* timeout N/A */ + }, +}; + + +int +EvdevMBEmuTimer(InputInfoPtr pInfo) +{ + EvdevPtr pEvdev = pInfo->private; + int sigstate; + int id; + + sigstate = xf86BlockSIGIO (); + + pEvdev->emulateMB.pending = FALSE; + if ((id = stateTab[pEvdev->emulateMB.state][4][0]) != 0) { + xf86PostButtonEvent(pInfo->dev, 0, abs(id), (id >= 0), 0, 0); + pEvdev->emulateMB.state = + stateTab[pEvdev->emulateMB.state][4][2]; + } else { + ErrorF("Got unexpected buttonTimer in state %d\n", + pEvdev->emulateMB.state); + } + + xf86UnblockSIGIO (sigstate); + return 0; +} + + +/** + * Emulate a middle button on button press. + * + * @param code Evdev event code (BTN_LEFT or BTN_RIGHT) + * @param press TRUE if press, FALSE if release. + * + * @return TRUE if event was swallowed by middle mouse button emulation, FALSE + * otherwise. + */ +BOOL +EvdevMBEmuFilterEvent(InputInfoPtr pInfo, int code, BOOL press) +{ + EvdevPtr pEvdev = pInfo->private; + int id; + int *btstate; + int ret = FALSE; + + if (!pEvdev->emulateMB.enabled) + return ret; + + /* don't care about other buttons */ + if (code != BTN_LEFT && code != BTN_RIGHT) + return ret; + + btstate = &pEvdev->emulateMB.buttonstate; + if (press) + *btstate |= (code == BTN_LEFT) ? 0x1 : 0x2; + else + *btstate &= (code == BTN_LEFT) ? ~0x1 : ~0x2; + + if ((id = stateTab[pEvdev->emulateMB.state][*btstate][0]) != 0) + { + xf86PostButtonEvent(pInfo->dev, 0, abs(id), (id >= 0), 0, 0); + ret = TRUE; + } + if ((id = stateTab[pEvdev->emulateMB.state][*btstate][1]) != 0) + { + xf86PostButtonEvent(pInfo->dev, 0, abs(id), (id >= 0), 0, 0); + ret = TRUE; + } + + pEvdev->emulateMB.state = + stateTab[pEvdev->emulateMB.state][*btstate][2]; + + if (stateTab[pEvdev->emulateMB.state][4][0] != 0) { + pEvdev->emulateMB.expires = GetTimeInMillis () + pEvdev->emulateMB.timeout; + pEvdev->emulateMB.pending = TRUE; + ret = TRUE; + } else { + pEvdev->emulateMB.pending = FALSE; + } + + return ret; +} + + +void EvdevMBEmuWakeupHandler(pointer data, + int i, + pointer LastSelectMask) +{ + InputInfoPtr pInfo = (InputInfoPtr)data; + EvdevPtr pEvdev = (EvdevPtr)pInfo->private; + int ms; + + if (pEvdev->emulateMB.pending) + { + ms = pEvdev->emulateMB.expires - GetTimeInMillis(); + if (ms <= 0) + EvdevMBEmuTimer(pInfo); + } +} + +void EvdevMBEmuBlockHandler(pointer data, + struct timeval **waitTime, + pointer LastSelectMask) +{ + InputInfoPtr pInfo = (InputInfoPtr) data; + EvdevPtr pEvdev= (EvdevPtr) pInfo->private; + int ms; + + if (pEvdev->emulateMB.pending) + { + ms = pEvdev->emulateMB.expires - GetTimeInMillis (); + if (ms <= 0) + ms = 0; + AdjustWaitForDelay (waitTime, ms); + } +} + +void +EvdevMBEmuPreInit(InputInfoPtr pInfo) +{ + EvdevPtr pEvdev = (EvdevPtr)pInfo->private; + + pEvdev->emulateMB.enabled = xf86SetBoolOption(pInfo->options, + "Emulate3Buttons", TRUE); + pEvdev->emulateMB.timeout = xf86SetIntOption(pInfo->options, + "Emulate3Timeout", 50); + RegisterBlockAndWakeupHandlers (EvdevMBEmuBlockHandler, + EvdevMBEmuWakeupHandler, + (pointer)pInfo); + +} + +/* Enable/disable middle mouse button emulation. */ +void +EvdevMBEmuEnable(InputInfoPtr pInfo, BOOL enable) +{ + EvdevPtr pEvdev = (EvdevPtr)pInfo->private; + pEvdev->emulateMB.enabled = enable; +} |