[PATCH libinput 1/2] touchpad: end tap-and-drag with an extra tap

Peter Hutterer peter.hutterer at who-t.net
Wed May 6 00:34:32 PDT 2015


From: Velimir Lisec <lisec.velimir at gmail.com>

Currently for the tap-and-drag gesture to end user has to wait for a
timeout to expire. Make it possible to end the drag gesture by just tapping.

The allowed finger sequences to start and end a drag are thus:
tap, down, .... move ...., up  <wait for timeout>
tap, down, .... move ...., up, tap

https://bugs.freedesktop.org/show_bug.cgi?id=90255

Signed-off-by: Velimir Lisec <lisec.velimir at gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer at who-t.net>

State diagram changes and a doc change squashed in.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 doc/tapping.dox                    |   4 +
 doc/touchpad-tap-state-machine.svg | 480 ++++++++++++++++++++-----------------
 src/evdev-mt-touchpad-tap.c        |  40 +++-
 src/evdev-mt-touchpad.h            |   1 +
 4 files changed, 305 insertions(+), 220 deletions(-)

diff --git a/doc/tapping.dox b/doc/tapping.dox
index f603b7d..7eb81e6 100644
--- a/doc/tapping.dox
+++ b/doc/tapping.dox
@@ -33,6 +33,10 @@ continue the dragging process, so that multiple touchpad-widths of distance
 can be covered easily. If two-fingers are supported by the hardware, a
 second finger can be used to drag while the first is held in-place.
 
+An alternative method to end a drag process is to tap immediately after
+lifting the finger. The full sequence is thus: tap, finger down, drag,
+finger up, tap.
+
 @section tap_constraints Constraints while tapping
 
 A couple of constraints apply to the contact to be converted into a press, the most common ones are:
diff --git a/doc/touchpad-tap-state-machine.svg b/doc/touchpad-tap-state-machine.svg
index b168b4f..1017982 100644
--- a/doc/touchpad-tap-state-machine.svg
+++ b/doc/touchpad-tap-state-machine.svg
@@ -14,93 +14,93 @@
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1729.75" y="35.75">
-        IDLE</text>
+	IDLE</text>
     </g>
     <rect x="1672" y="292" width="130" height="40" rx="2.4" ry="2.4" fill="#ccffcc" stroke="#000000" stroke-width="2" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1736.75" y="315.75">
-        TOUCH</text>
+	TOUCH</text>
     </g>
     <path d="M 1706.04 107 C 1708.84 103.86 1712.82 102.05 1717.02 102 L 1750.99 102 C 1755.19 102.05 1759.17 103.86 1761.97 107 L 1781.95 130 C 1782.51 131.28 1782.51 132.72 1781.95 134 L 1761.97 157 C 1759.17 160.14 1755.19 161.95 1750.99 162 L 1717.02 162 C 1712.82 161.95 1708.84 160.14 1706.04 157 L 1686.06 134 C 1685.5 132.72 1685.5 131.28 1686.06 130 L 1706.04 107 Z" fill="#ffd966" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1733.75" y="128.75">
-        first</text>
+	first</text>
       <text x="1733.75" y="142.75">
-        finger down</text>
+	finger down</text>
     </g>
     <path d="M 1731 62 L 1732.68 95.64" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1463.75" y="435.75">
-        finger up</text>
+	finger up</text>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1463.75" y="743.75">
-        button 1</text>
+	button 1</text>
       <text x="1463.75" y="757.75">
-        press</text>
+	press</text>
     </g>
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       <text x="2011.25" y="435.75">
-        timeout</text>
+	timeout</text>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1830.25" y="428.75">
-        move > </text>
+	move > </text>
       <text x="1830.25" y="442.75">
-        threshold</text>
+	threshold</text>
     </g>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1641.25" y="428.75">
-        second</text>
+	second</text>
       <text x="1641.25" y="442.75">
-        finger down</text>
+	finger down</text>
     </g>
     <path d="M 1721 332 L 1668.98 397.03" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1881.75" y="870.75">
-        TOUCH_2</text>
+	TOUCH_2</text>
     </g>
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       <text x="1754.75" y="1003.75">
-        second</text>
+	second</text>
       <text x="1754.75" y="1017.75">
-        finger up</text>
+	finger up</text>
     </g>
     <path d="M 1864 887 L 1786.29 972.29" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
     <path d="M 1782.75 976.17 L 1784.88 968.64 L 1786.29 972.29 L 1790.05 973.36 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1604.75" y="663.75">
-        button 2</text>
+	button 2</text>
       <text x="1604.75" y="677.75">
-        press</text>
+	press</text>
     </g>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="2004.25" y="983.75">
-        move > </text>
+	move > </text>
       <text x="2004.25" y="997.75">
-        threshold</text>
+	threshold</text>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="2130.25" y="930.75">
-        timeout</text>
+	timeout</text>
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@@ -109,16 +109,16 @@
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1668.25" y="1133.75">
-        button 1</text>
+	button 1</text>
       <text x="1668.25" y="1147.75">
-        release</text>
+	release</text>
     </g>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1614.25" y="568.75">
-        button 2</text>
+	button 2</text>
       <text x="1614.25" y="582.75">
-        release</text>
+	release</text>
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@@ -127,42 +127,42 @@
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1463.75" y="940.75">
-        TAPPED</text>
+	TAPPED</text>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="1555.75" y="1070.75">
-        timeout</text>
+	timeout</text>
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       <text x="1400.25" y="1033.75">
-        first</text>
+	first</text>
       <text x="1400.25" y="1047.75">
-        finger down</text>
+	finger down</text>
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+	finger up</text>
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-        third</text>
+	third</text>
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+	finger down</text>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="790.25" y="715.75">
-        timeout</text>
+	timeout</text>
     </g>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="913.25" y="706.75">
-        second</text>
+	second</text>
       <text x="913.25" y="720.75">
-        finger down</text>
+	finger down</text>
     </g>
     <path d="M 586.54 685 C 589.34 681.86 593.32 680.05 597.52 680 L 631.49 680 C 635.69 680.05 639.67 681.86 642.47 685 L 662.45 708 C 663.01 709.28 663.01 710.72 662.45 712 L 642.47 735 C 639.67 738.14 635.69 739.95 631.49 740 L 597.52 740 C 593.32 739.95 589.34 738.14 586.54 735 L 566.56 712 C 566 710.72 566 709.28 566.56 708 L 586.54 685 Z" fill="#67ab9f" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="614.25" y="706.75">
-        move > </text>
+	move > </text>
       <text x="614.25" y="720.75">
-        threshold</text>
+	threshold</text>
     </g>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="680.75" y="821.75">
-        button 1</text>
+	button 1</text>
       <text x="680.75" y="835.75">
-        release</text>
+	release</text>
     </g>
     <path d="M 667.22 912.1 C 668.36 908.9 670.22 907.04 672.18 907.12 L 740.64 907.12 C 742.2 907.08 743.7 907.63 744.67 908.61 C 745.65 909.59 745.99 910.88 745.6 912.1 L 726.75 961.9 C 725.61 965.1 723.75 966.96 721.79 966.88 L 652.34 966.88 C 650.95 966.69 649.73 966.05 648.97 965.1 C 648.22 964.15 648 962.99 648.37 961.9 Z" fill="#ff6666" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="696.75" y="933.75">
-        button 1</text>
+	button 1</text>
       <text x="696.75" y="947.75">
-        press</text>
+	press</text>
     </g>
     <path d="M 632 740 L 660.8 789.5" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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@@ -1022,16 +1018,16 @@
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="811.75" y="823.75">
-        button 1</text>
+	button 1</text>
       <text x="811.75" y="837.75">
-        release</text>
+	release</text>
     </g>
     <path d="M 861.22 910.1 C 862.36 906.9 864.22 905.04 866.18 905.12 L 934.64 905.12 C 936.2 905.08 937.7 905.63 938.67 906.61 C 939.65 907.59 939.99 908.88 939.6 910.1 L 920.75 959.9 C 919.61 963.1 917.75 964.96 915.79 964.88 L 846.34 964.88 C 844.95 964.69 843.73 964.05 842.97 963.1 C 842.22 962.15 842 960.99 842.37 959.9 Z" fill="#ff6666" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="890.75" y="931.75">
-        button 1</text>
+	button 1</text>
       <text x="890.75" y="945.75">
-        press</text>
+	press</text>
     </g>
     <path d="M 834 857 L 865.25 899.85" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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@@ -1042,16 +1038,16 @@
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="932.75" y="821.75">
-        button 1</text>
+	button 1</text>
       <text x="932.75" y="835.75">
-        release</text>
+	release</text>
     </g>
     <path d="M 965.22 912.1 C 966.36 908.9 968.22 907.04 970.18 907.12 L 1038.64 907.12 C 1040.2 907.08 1041.7 907.63 1042.67 908.61 C 1043.65 909.59 1043.99 910.88 1043.6 912.1 L 1024.75 961.9 C 1023.61 965.1 1021.75 966.96 1019.79 966.88 L 950.34 966.88 C 948.95 966.69 947.73 966.05 946.97 965.1 C 946.22 964.15 946 962.99 946.37 961.9 Z" fill="#ff6666" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="994.75" y="933.75">
-        button 1</text>
+	button 1</text>
       <text x="994.75" y="947.75">
-        press</text>
+	press</text>
     </g>
     <path d="M 949 855 L 974.9 901.44" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
     <path d="M 977.46 906.02 L 970.99 901.61 L 974.9 901.44 L 977.1 898.21 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
@@ -1059,36 +1055,88 @@
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     <path d="M 1094.75 1366.91 L 1089.76 1360.88 L 1093.56 1361.8 L 1096.58 1359.3 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
-    <path d="M 379 965 L 368.71 1056.67" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
-    <path d="M 368.12 1061.89 L 365.43 1054.54 L 368.71 1056.67 L 372.38 1055.32 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 379 965 L 368.72 1055.67" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 368.13 1060.89 L 365.44 1053.54 L 368.72 1055.67 L 372.39 1054.33 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
     <path d="M 211.5 798.7 C 227.62 804.91 245.38 804.91 261.5 798.7 C 277.62 792.5 295.38 792.5 311.5 798.7 L 311.5 851.28 C 295.38 845.08 277.62 845.08 261.5 851.28 C 245.38 857.49 227.62 857.49 211.5 851.28 L 211.5 798.7 Z" fill="#ffd966" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="261.25" y="828.75">
-        TOUCH_TOUCH</text>
+	TOUCH_TOUCH</text>
     </g>
     <path d="M 255 897 L 258.35 864.33" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
     <path d="M 258.89 859.11 L 261.65 866.43 L 258.35 864.33 L 254.69 865.72 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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     <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="482.25" y="818.75">
-        TOUCH_IDLE</text>
+	TOUCH_IDLE</text>
     </g>
     <path d="M 496 740 L 489.16 776.74" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
     <path d="M 488.2 781.9 L 486.04 774.38 L 489.16 776.74 L 492.93 775.66 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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     <g fill="#FFFFFF" font-family="Helvetica" text-anchor="middle" font-size="12px">
       <text x="50.25" y="1321.75">
-        phys</text>
+	phys</text>
       <text x="50.25" y="1335.75">
-        button</text>
+	button</text>
       <text x="50.25" y="1349.75">
-        press</text>
+	press</text>
     </g>
-    <path d="M 341 1103 L 94 1298.05" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
-    <path d="M 89.88 1301.31 L 93.2 1294.22 L 94 1298.05 L 97.54 1299.72 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 341 1102 L 93 1298.05" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 88.88 1301.31 L 92.2 1294.22 L 93 1298.05 L 96.54 1299.71 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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     <path d="M 718 602 L 484.35 1191.08" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
     <path d="M 482.41 1195.96 L 481.74 1188.16 L 484.35 1191.08 L 488.25 1190.74 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <rect x="439.5" y="1512" width="209" height="40" rx="2.4" ry="2.4" fill="#ccffcc" stroke="#000000" stroke-width="2" pointer-events="none"/>
+    <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
+      <text x="543.75" y="1535.75">
+	DRAGGING_OR_TAP</text>
+    </g>
+    <path d="M 424.04 1777 C 426.84 1773.86 430.82 1772.05 435.02 1772 L 468.99 1772 C 473.19 1772.05 477.17 1773.86 479.97 1777 L 499.95 1800 C 500.51 1801.28 500.51 1802.72 499.95 1804 L 479.97 1827 C 477.17 1830.14 473.19 1831.95 468.99 1832 L 435.02 1832 C 430.82 1831.95 426.84 1830.14 424.04 1827 L 404.06 1804 C 403.5 1802.72 403.5 1801.28 404.06 1800 L 424.04 1777 Z" fill="#ffd966" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
+    <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
+      <text x="451.75" y="1798.75">
+	first</text>
+      <text x="451.75" y="1812.75">
+	finger up</text>
+    </g>
+    <path d="M 537 1552 L 464.05 1765.97" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 462.36 1770.94 L 461.31 1763.19 L 464.05 1765.97 L 467.93 1765.45 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 596.04 1417 C 598.84 1413.86 602.82 1412.05 607.02 1412 L 640.99 1412 C 645.19 1412.05 649.17 1413.86 651.97 1417 L 671.95 1440 C 672.51 1441.28 672.51 1442.72 671.95 1444 L 651.97 1467 C 649.17 1470.14 645.19 1471.95 640.99 1472 L 607.02 1472 C 602.82 1471.95 598.84 1470.14 596.04 1467 L 576.06 1444 C 575.5 1442.72 575.5 1441.28 576.06 1440 L 596.04 1417 Z" fill="#99ffff" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
+    <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
+      <text x="623.75" y="1445.75">
+	timeout</text>
+    </g>
+    <path d="M 562 1512 L 592.81 1476.79" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 596.26 1472.84 L 594.29 1480.41 L 592.81 1476.79 L 589.02 1475.8 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 673 1454 L 823.8 1489.54" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 828.91 1490.74 L 821.3 1492.54 L 823.8 1489.54 L 822.9 1485.73 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 713.54 1517 C 716.34 1513.86 720.32 1512.05 724.52 1512 L 758.49 1512 C 762.69 1512.05 766.67 1513.86 769.47 1517 L 789.45 1540 C 790.01 1541.28 790.01 1542.72 789.45 1544 L 769.47 1567 C 766.67 1570.14 762.69 1571.95 758.49 1572 L 724.52 1572 C 720.32 1571.95 716.34 1570.14 713.54 1567 L 693.56 1544 C 693 1542.72 693 1541.28 693.56 1540 L 713.54 1517 Z" fill="#67ab9f" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
+    <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
+      <text x="741.25" y="1538.75">
+	move > </text>
+      <text x="741.25" y="1552.75">
+	threshold</text>
+    </g>
+    <path d="M 649 1538 L 686.64 1539.71" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 691.88 1539.95 L 684.73 1543.13 L 686.64 1539.71 L 685.05 1536.13 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 790 1531 L 823.79 1523.4" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 828.91 1522.25 L 822.85 1527.2 L 823.79 1523.4 L 821.31 1520.37 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 616 1939 L 580.47 1789.2" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 579.26 1784.09 L 584.28 1790.09 L 580.47 1789.2 L 577.47 1791.71 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 567 1718 L 547.76 1558.32" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 547.13 1553.11 L 551.45 1559.64 L 547.76 1558.32 L 544.5 1560.48 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 568 1552 L 778.14 1729.89" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 782.15 1733.28 L 774.54 1731.43 L 778.14 1729.89 L 779.07 1726.08 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 469.5 2037.7 C 485.62 2043.91 503.38 2043.91 519.5 2037.7 C 535.62 2031.5 553.38 2031.5 569.5 2037.7 L 569.5 2090.28 C 553.38 2084.08 535.62 2084.08 519.5 2090.28 C 503.38 2096.49 485.62 2096.49 469.5 2090.28 L 469.5 2037.7 Z" fill="#ffd966" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none"/>
+    <g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px">
+      <text x="519.25" y="2067.75">
+	TOUCH_IDLE</text>
+    </g>
+    <path d="M 460 1832 L 509.43 2025.83" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 510.72 2030.92 L 505.6 2025 L 509.43 2025.83 L 512.39 2023.27 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
+    <path d="M 570 2054 L 877.75 1994.21" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
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+    <path d="M 478.26 1258.09 L 483.29 1264.08 L 479.48 1263.19 L 476.48 1265.71 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/>
   </g>
 </svg>
+
diff --git a/src/evdev-mt-touchpad-tap.c b/src/evdev-mt-touchpad-tap.c
index 61f94e5..fb8c9e4 100644
--- a/src/evdev-mt-touchpad-tap.c
+++ b/src/evdev-mt-touchpad-tap.c
@@ -74,6 +74,7 @@ tap_state_to_str(enum tp_tap_state state)
 	CASE_RETURN_STRING(TAP_STATE_DRAGGING);
 	CASE_RETURN_STRING(TAP_STATE_DRAGGING_WAIT);
 	CASE_RETURN_STRING(TAP_STATE_DRAGGING_OR_DOUBLETAP);
+	CASE_RETURN_STRING(TAP_STATE_DRAGGING_OR_TAP);
 	CASE_RETURN_STRING(TAP_STATE_DRAGGING_2);
 	CASE_RETURN_STRING(TAP_STATE_MULTITAP);
 	CASE_RETURN_STRING(TAP_STATE_MULTITAP_DOWN);
@@ -409,16 +410,42 @@ tp_tap_dragging_wait_handle_event(struct tp_dispatch *tp,
 
 	switch (event) {
 	case TAP_EVENT_TOUCH:
-		tp->tap.state = TAP_STATE_DRAGGING;
+		tp->tap.state = TAP_STATE_DRAGGING_OR_TAP;
+		tp_tap_set_timer(tp, time);
+		break;
+	case TAP_EVENT_RELEASE:
+	case TAP_EVENT_MOTION:
+		break;
+	case TAP_EVENT_TIMEOUT:
+		tp->tap.state = TAP_STATE_IDLE;
+		tp_tap_notify(tp, time, 1, LIBINPUT_BUTTON_STATE_RELEASED);
+		break;
+	case TAP_EVENT_BUTTON:
+		tp->tap.state = TAP_STATE_DEAD;
+		tp_tap_notify(tp, time, 1, LIBINPUT_BUTTON_STATE_RELEASED);
+		break;
+	}
+}
+
+static void
+tp_tap_dragging_tap_handle_event(struct tp_dispatch *tp,
+				  struct tp_touch *t,
+				  enum tap_event event, uint64_t time)
+{
+
+	switch (event) {
+	case TAP_EVENT_TOUCH:
+		tp->tap.state = TAP_STATE_DRAGGING_2;
 		tp_tap_clear_timer(tp);
 		break;
 	case TAP_EVENT_RELEASE:
-	case TAP_EVENT_MOTION:
-		break;
-	case TAP_EVENT_TIMEOUT:
 		tp->tap.state = TAP_STATE_IDLE;
 		tp_tap_notify(tp, time, 1, LIBINPUT_BUTTON_STATE_RELEASED);
 		break;
+	case TAP_EVENT_MOTION:
+	case TAP_EVENT_TIMEOUT:
+		tp->tap.state = TAP_STATE_DRAGGING;
+		break;
 	case TAP_EVENT_BUTTON:
 		tp->tap.state = TAP_STATE_DEAD;
 		tp_tap_notify(tp, time, 1, LIBINPUT_BUTTON_STATE_RELEASED);
@@ -588,6 +615,9 @@ tp_tap_handle_event(struct tp_dispatch *tp,
 	case TAP_STATE_DRAGGING_WAIT:
 		tp_tap_dragging_wait_handle_event(tp, t, event, time);
 		break;
+	case TAP_STATE_DRAGGING_OR_TAP:
+		tp_tap_dragging_tap_handle_event(tp, t, event, time);
+		break;
 	case TAP_STATE_DRAGGING_2:
 		tp_tap_dragging2_handle_event(tp, t, event, time);
 		break;
@@ -692,6 +722,7 @@ tp_tap_handle_state(struct tp_dispatch *tp, uint64_t time)
 	case TAP_STATE_TOUCH:
 	case TAP_STATE_TAPPED:
 	case TAP_STATE_DRAGGING_OR_DOUBLETAP:
+	case TAP_STATE_DRAGGING_OR_TAP:
 	case TAP_STATE_TOUCH_2:
 	case TAP_STATE_TOUCH_3:
 	case TAP_STATE_MULTITAP_DOWN:
@@ -870,6 +901,7 @@ tp_tap_dragging(struct tp_dispatch *tp)
 	case TAP_STATE_DRAGGING:
 	case TAP_STATE_DRAGGING_2:
 	case TAP_STATE_DRAGGING_WAIT:
+	case TAP_STATE_DRAGGING_OR_TAP:
 		return true;
 	default:
 		return false;
diff --git a/src/evdev-mt-touchpad.h b/src/evdev-mt-touchpad.h
index d4f5874..a056ea0 100644
--- a/src/evdev-mt-touchpad.h
+++ b/src/evdev-mt-touchpad.h
@@ -94,6 +94,7 @@ enum tp_tap_state {
 	TAP_STATE_TOUCH_3,
 	TAP_STATE_TOUCH_3_HOLD,
 	TAP_STATE_DRAGGING_OR_DOUBLETAP,
+	TAP_STATE_DRAGGING_OR_TAP,
 	TAP_STATE_DRAGGING,
 	TAP_STATE_DRAGGING_WAIT,
 	TAP_STATE_DRAGGING_2,
-- 
2.3.5



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