mirror of
https://github.com/koreader/koreader
synced 2024-11-10 01:10:34 +00:00
bc133e70d3
* Decode EV_KEY:KEY_BATTERY * Input: Only drop hovering *pen* events. There are currently too many broken 0-pressure *finger* events being reported on the Elipsa, making a dumb rejection highly annoying. * Bump base https://github.com/koreader/koreader-base/pull/1393 * Rely on actual events to detect loss of contact for the "snow" protocol. Allows simplifying the whole thing. * Use `ipairs` over `pairs` for pure arrays.
1016 lines
36 KiB
Lua
1016 lines
36 KiB
Lua
--[[--
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This module detects gestures.
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Current detectable gestures:
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* `touch` (user touched screen)
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* `tap` (touch action detected as single tap)
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* `pan`
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* `hold`
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* `swipe`
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* `pinch`
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* `spread`
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* `rotate`
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* `hold_pan`
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* `double_tap`
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* `inward_pan`
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* `outward_pan`
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* `pan_release`
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* `hold_release`
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* `two_finger_tap`
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* `two_finger_pan`
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* `two_finger_swipe`
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* `two_finger_pan_release`
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You change the state machine by feeding it touch events, i.e. calling
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@{GestureDetector:feedEvent|GestureDetector:feedEvent(tev)}.
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a touch event should have following format:
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tev = {
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slot = 1,
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id = 46,
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x = 0,
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y = 1,
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timev = TimeVal:new{...},
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}
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Don't confuse `tev` with raw evs from kernel, `tev` is built according to ev.
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@{GestureDetector:feedEvent|GestureDetector:feedEvent(tev)} will return a
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detection result when you feed a touch release event to it.
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--]]
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local Geom = require("ui/geometry")
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local TimeVal = require("ui/timeval")
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local logger = require("logger")
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local util = require("util")
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-- We're going to need some clockid_t constants
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local ffi = require("ffi")
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local C = ffi.C
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require("ffi/posix_h")
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-- default values (all the time parameters are in microseconds)
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local TAP_INTERVAL = 0 * 1000
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local DOUBLE_TAP_INTERVAL = 300 * 1000
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local TWO_FINGER_TAP_DURATION = 300 * 1000
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local HOLD_INTERVAL = 500 * 1000
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local SWIPE_INTERVAL = 900 * 1000
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-- current values
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local ges_tap_interval = G_reader_settings:readSetting("ges_tap_interval") or TAP_INTERVAL
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ges_tap_interval = TimeVal:new{ usec = ges_tap_interval }
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local ges_double_tap_interval = G_reader_settings:readSetting("ges_double_tap_interval") or DOUBLE_TAP_INTERVAL
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ges_double_tap_interval = TimeVal:new{ usec = ges_double_tap_interval }
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local ges_two_finger_tap_duration = G_reader_settings:readSetting("ges_two_finger_tap_duration") or TWO_FINGER_TAP_DURATION
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ges_two_finger_tap_duration = TimeVal:new{ usec = ges_two_finger_tap_duration }
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local ges_hold_interval = G_reader_settings:readSetting("ges_hold_interval") or HOLD_INTERVAL
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ges_hold_interval = TimeVal:new{ usec = ges_hold_interval }
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local ges_swipe_interval = G_reader_settings:readSetting("ges_swipe_interval") or SWIPE_INTERVAL
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ges_swipe_interval = TimeVal:new{ usec = ges_swipe_interval }
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local GestureDetector = {
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-- must be initialized with the Input singleton class
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input = nil,
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-- default values (accessed for display by plugins/gestures.koplugin)
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TAP_INTERVAL = TAP_INTERVAL,
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DOUBLE_TAP_INTERVAL = DOUBLE_TAP_INTERVAL,
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TWO_FINGER_TAP_DURATION = TWO_FINGER_TAP_DURATION,
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HOLD_INTERVAL = HOLD_INTERVAL,
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SWIPE_INTERVAL = SWIPE_INTERVAL,
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-- pinch/spread direction table
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DIRECTION_TABLE = {
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east = "horizontal",
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west = "horizontal",
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north = "vertical",
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south = "vertical",
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northeast = "diagonal",
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northwest = "diagonal",
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southeast = "diagonal",
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southwest = "diagonal",
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},
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-- states are stored in separated slots
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states = {},
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pending_hold_timer = {},
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track_ids = {},
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tev_stacks = {},
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-- latest feeded touch event in each slots
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last_tevs = {},
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first_tevs = {},
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-- for multiswipe gestures
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multiswipe_directions = {},
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-- detecting status on each slots
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detectings = {},
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-- for single/double tap
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last_taps = {},
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-- for timestamp clocksource detection
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clock_id = nil,
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}
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function GestureDetector:new(o)
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o = o or {}
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setmetatable(o, self)
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self.__index = self
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if o.init then o:init() end
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return o
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end
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function GestureDetector:init()
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local scaler = self.screen:getDPI() / 167
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-- distance parameters
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self.TWO_FINGER_TAP_REGION = 20 * scaler
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self.DOUBLE_TAP_DISTANCE = 50 * scaler
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self.SINGLE_TAP_BOUNCE_DISTANCE = self.DOUBLE_TAP_DISTANCE
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self.PAN_THRESHOLD = self.DOUBLE_TAP_DISTANCE
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self.MULTISWIPE_THRESHOLD = self.DOUBLE_TAP_DISTANCE
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end
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--[[--
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Feeds touch events to state machine.
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--]]
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function GestureDetector:feedEvent(tevs)
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repeat
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local tev = table.remove(tevs)
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if tev then
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local slot = tev.slot
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if not self.states[slot] then
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self:clearState(slot) -- initiate state
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end
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local ges = self.states[slot](self, tev)
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if tev.id ~= -1 then
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-- NOTE: tev is actually a simple reference to Input's self.ev_slots[slot],
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-- which means self.last_tevs[slot] doesn't actually point to the *previous*
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-- input frame for a given slot, but always points to the *current* input frame for that slot!
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-- Compare to self.first_tevs below, which does create a copy...
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self.last_tevs[slot] = tev
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end
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-- return no more than one gesture
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if ges then return ges end
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end
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until tev == nil
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end
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function GestureDetector:deepCopyEv(tev)
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return {
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x = tev.x,
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y = tev.y,
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id = tev.id,
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slot = tev.slot,
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timev = tev.timev, -- No need to make a copy of this one, tev.timev is re-assigned to a new object on every SYN_REPORT
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}
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end
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--[[
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tap2 is the later tap
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--]]
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function GestureDetector:isTapBounce(tap1, tap2, interval)
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-- NOTE: If time went backwards, make the delta infinite to avoid misdetections,
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-- as we can no longer compute a sensible value...
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local tv_diff = tap2.timev - tap1.timev
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if not tv_diff:isPositive() then
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tv_diff = TimeVal.huge
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end
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return (
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math.abs(tap1.x - tap2.x) < self.SINGLE_TAP_BOUNCE_DISTANCE and
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math.abs(tap1.y - tap2.y) < self.SINGLE_TAP_BOUNCE_DISTANCE and
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tv_diff < interval
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)
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end
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function GestureDetector:isDoubleTap(tap1, tap2)
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local tv_diff = tap2.timev - tap1.timev
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if not tv_diff:isPositive() then
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tv_diff = TimeVal.huge
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end
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return (
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math.abs(tap1.x - tap2.x) < self.DOUBLE_TAP_DISTANCE and
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math.abs(tap1.y - tap2.y) < self.DOUBLE_TAP_DISTANCE and
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tv_diff < ges_double_tap_interval
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)
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end
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-- Takes TimeVals as input, not a tev
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function GestureDetector:isHold(t1, t2)
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local tv_diff = t2 - t1
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if not tv_diff:isPositive() then
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tv_diff = TimeVal.zero
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end
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-- NOTE: We cheat by not checking a distance because we're only checking that in tapState,
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-- which already ensures a stationary finger, by elimination ;).
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return tv_diff >= ges_hold_interval
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end
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function GestureDetector:isTwoFingerTap()
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local s1 = self.input.main_finger_slot
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local s2 = self.input.main_finger_slot + 1
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if self.last_tevs[s1] == nil or self.last_tevs[s2] == nil then
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return false
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end
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local x_diff0 = math.abs(self.last_tevs[s1].x - self.first_tevs[s1].x)
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local x_diff1 = math.abs(self.last_tevs[s2].x - self.first_tevs[s2].x)
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local y_diff0 = math.abs(self.last_tevs[s1].y - self.first_tevs[s1].y)
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local y_diff1 = math.abs(self.last_tevs[s2].y - self.first_tevs[s2].y)
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local tv_diff0 = self.last_tevs[s1].timev - self.first_tevs[s1].timev
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if not tv_diff0:isPositive() then
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tv_diff0 = TimeVal.huge
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end
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local tv_diff1 = self.last_tevs[s2].timev - self.first_tevs[s2].timev
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if not tv_diff1:isPositive() then
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tv_diff1 = TimeVal.huge
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end
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return (
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x_diff0 < self.TWO_FINGER_TAP_REGION and
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x_diff1 < self.TWO_FINGER_TAP_REGION and
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y_diff0 < self.TWO_FINGER_TAP_REGION and
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y_diff1 < self.TWO_FINGER_TAP_REGION and
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tv_diff0 < ges_two_finger_tap_duration and
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tv_diff1 < ges_two_finger_tap_duration
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)
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end
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--[[--
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Compares `last_pan` with `first_tev` in this slot.
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The second boolean argument `simple` results in only four directions if true.
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@return (direction, distance) pan direction and distance
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--]]
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function GestureDetector:getPath(slot, simple, diagonal, first_tev)
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first_tev = first_tev or self.first_tevs
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local x_diff = self.last_tevs[slot].x - first_tev[slot].x
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local y_diff = self.last_tevs[slot].y - first_tev[slot].y
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local direction = nil
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local distance = math.sqrt(x_diff*x_diff + y_diff*y_diff)
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if x_diff ~= 0 or y_diff ~= 0 then
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local v_direction = y_diff < 0 and "north" or "south"
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local h_direction = x_diff < 0 and "west" or "east"
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if (not simple
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and math.abs(y_diff) > 0.577*math.abs(x_diff)
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and math.abs(y_diff) < 1.732*math.abs(x_diff))
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or (simple and diagonal)
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then
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direction = v_direction..h_direction
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elseif (math.abs(x_diff) > math.abs(y_diff)) then
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direction = h_direction
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else
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direction = v_direction
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end
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end
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return direction, distance
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end
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function GestureDetector:isSwipe(slot)
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if not self.first_tevs[slot] or not self.last_tevs[slot] then return end
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local tv_diff = self.last_tevs[slot].timev - self.first_tevs[slot].timev
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if not tv_diff:isPositive() then
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tv_diff = TimeVal.huge
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end
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if tv_diff < ges_swipe_interval then
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local x_diff = self.last_tevs[slot].x - self.first_tevs[slot].x
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local y_diff = self.last_tevs[slot].y - self.first_tevs[slot].y
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if x_diff ~= 0 or y_diff ~= 0 then
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return true
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end
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end
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end
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function GestureDetector:getRotate(orig_point, start_point, end_point)
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local a = orig_point:distance(start_point)
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local b = orig_point:distance(end_point)
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local c = start_point:distance(end_point)
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return math.acos((a*a + b*b - c*c)/(2*a*b))*180/math.pi
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end
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--[[
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Warning! this method won't update self.state, you need to do it
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in each state method!
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--]]
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function GestureDetector:switchState(state_new, tev, param)
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--- @todo Do we need to check whether state is valid? (houqp)
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return self[state_new](self, tev, param)
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end
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function GestureDetector:clearState(slot)
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self.states[slot] = self.initialState
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self.pending_hold_timer[slot] = nil
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self.detectings[slot] = false
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self.first_tevs[slot] = nil
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self.last_tevs[slot] = nil
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self.multiswipe_directions = {}
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self.multiswipe_type = nil
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-- Also clear any pending hold callbacks on that slot.
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-- (single taps call this, so we can't clear double_tap callbacks without being caught in an obvious catch-22 ;)).
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self.input:clearTimeout(slot, "hold")
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end
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function GestureDetector:setNewInterval(type, interval)
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if type == "ges_tap_interval" then
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ges_tap_interval = TimeVal:new{ usec = interval }
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elseif type == "ges_double_tap_interval" then
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ges_double_tap_interval = TimeVal:new{ usec = interval }
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elseif type == "ges_two_finger_tap_duration" then
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ges_two_finger_tap_duration = TimeVal:new{ usec = interval }
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elseif type == "ges_hold_interval" then
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ges_hold_interval = TimeVal:new{ usec = interval }
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elseif type == "ges_swipe_interval" then
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ges_swipe_interval = TimeVal:new{ usec = interval }
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end
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end
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function GestureDetector:getInterval(type)
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if type == "ges_tap_interval" then
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return ges_tap_interval:tousecs()
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elseif type == "ges_double_tap_interval" then
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return ges_double_tap_interval:tousecs()
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elseif type == "ges_two_finger_tap_duration" then
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return ges_two_finger_tap_duration:tousecs()
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elseif type == "ges_hold_interval" then
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return ges_hold_interval:tousecs()
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elseif type == "ges_swipe_interval" then
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return ges_swipe_interval:tousecs()
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end
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end
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function GestureDetector:clearStates()
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for k, _ in pairs(self.states) do
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self:clearState(k)
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end
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end
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function GestureDetector:initialState(tev)
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local slot = tev.slot
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if tev.id then
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-- an event ends
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if tev.id == -1 then
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self.detectings[slot] = false
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else
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self.track_ids[slot] = tev.id
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if tev.x and tev.y then
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-- user starts a new touch motion
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if not self.detectings[slot] then
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self.detectings[slot] = true
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-- NOTE: We can't use a simple reference, because tev is actually Input's self.ev_slots[slot],
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-- and *that* is a fixed reference for a given slot!
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-- Here, we really want to rememver the *first* tev, so, make a copy of it.
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self.first_tevs[slot] = self:deepCopyEv(tev)
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-- default to tap state
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return self:switchState("tapState", tev)
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end
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end
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end
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end
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end
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--[[--
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Attempts to figure out which clock source tap events are using...
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]]
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function GestureDetector:probeClockSource(timev)
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-- We'll check if that timestamp is +/- 2.5s away from the three potential clock sources supported by evdev.
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-- We have bigger issues than this if we're parsing events more than 3s late ;).
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local threshold = TimeVal:new{ sec = 2, usec = 500000 }
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-- Start w/ REALTIME, because it's the easiest to detect ;).
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local realtime = TimeVal:realtime_coarse()
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-- clock-threshold <= timev <= clock+threshold
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if timev >= realtime - threshold and timev <= realtime + threshold then
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self.clock_id = C.CLOCK_REALTIME
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logger.info("GestureDetector:probeClockSource: Touch event timestamps appear to use CLOCK_REALTIME")
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return
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end
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-- Then MONOTONIC, as it's (hopefully) more common than BOOTTIME (and also guaranteed to be an usable clock source)
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local monotonic = TimeVal:monotonic_coarse()
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if timev >= monotonic - threshold and timev <= monotonic + threshold then
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self.clock_id = C.CLOCK_MONOTONIC
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logger.info("GestureDetector:probeClockSource: Touch event timestamps appear to use CLOCK_MONOTONIC")
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return
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end
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-- Finally, BOOTTIME
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local boottime = TimeVal:boottime()
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-- NOTE: It was implemented in Linux 2.6.39, so, reject 0, which would mean it's unsupported...
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if not boottime:isZero() and timev >= boottime - threshold and timev <= boottime + threshold then
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self.clock_id = C.CLOCK_BOOTTIME
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logger.info("GestureDetector:probeClockSource: Touch event timestamps appear to use CLOCK_BOOTTIME")
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return
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end
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-- If we're here, the detection was inconclusive :/
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self.clock_id = -1
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logger.info("GestureDetector:probeClockSource: Touch event clock source detection was inconclusive")
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-- Print all all the gory details in debug mode when this happens...
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logger.dbg("Input frame :", timev:tonumber())
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logger.dbg("CLOCK_REALTIME :", realtime:tonumber())
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logger.dbg("CLOCK_MONOTONIC:", monotonic:tonumber())
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logger.dbg("CLOCK_BOOTTIME :", boottime:tonumber())
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end
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function GestureDetector:getClockSource()
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return self.clock_id
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end
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function GestureDetector:resetClockSource()
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self.clock_id = nil
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end
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--[[--
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Handles both single and double tap.
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--]]
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function GestureDetector:tapState(tev)
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-- Attempt to detect the clock source for these events (we reset it on suspend to discriminate MONOTONIC from BOOTTIME).
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if not self.clock_id then
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self:probeClockSource(tev.timev)
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end
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logger.dbg("in tap state...")
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local slot = tev.slot
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if tev.id == -1 then
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local s1 = self.input.main_finger_slot
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local s2 = self.input.main_finger_slot + 1
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-- end of tap event
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if self.detectings[s1] and self.detectings[s2] then
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if self:isTwoFingerTap() then
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local pos0 = Geom:new{
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x = self.last_tevs[s1].x,
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y = self.last_tevs[s1].y,
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w = 0, h = 0,
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}
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local pos1 = Geom:new{
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x = self.last_tevs[s2].x,
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y = self.last_tevs[s2].y,
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w = 0, h = 0,
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}
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local tap_span = pos0:distance(pos1)
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logger.dbg("two-finger tap detected with span", tap_span)
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self:clearStates()
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return {
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ges = "two_finger_tap",
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pos = pos0:midpoint(pos1),
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span = tap_span,
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time = tev.timev,
|
|
}
|
|
else
|
|
self:clearState(slot)
|
|
end
|
|
elseif self.last_tevs[slot] ~= nil then
|
|
-- Normal single tap seems to always go thru here
|
|
-- (the next 'else' might be there for edge cases)
|
|
return self:handleDoubleTap(tev)
|
|
else
|
|
-- last tev in this slot is cleared by last two finger tap
|
|
self:clearState(slot)
|
|
return {
|
|
ges = "tap",
|
|
pos = Geom:new{
|
|
x = tev.x,
|
|
y = tev.y,
|
|
w = 0, h = 0,
|
|
},
|
|
time = tev.timev,
|
|
}
|
|
end
|
|
else
|
|
return self:handleNonTap(tev)
|
|
end
|
|
end
|
|
|
|
function GestureDetector:handleDoubleTap(tev)
|
|
local slot = tev.slot
|
|
local ges_ev = {
|
|
-- default to single tap
|
|
ges = "tap",
|
|
pos = Geom:new{
|
|
x = self.last_tevs[slot].x,
|
|
y = self.last_tevs[slot].y,
|
|
w = 0, h = 0,
|
|
},
|
|
time = tev.timev,
|
|
}
|
|
-- cur_tap is used for double tap detection
|
|
local cur_tap = {
|
|
x = tev.x,
|
|
y = tev.y,
|
|
timev = tev.timev,
|
|
}
|
|
|
|
-- Tap interval / bounce detection may be tweaked by widget (i.e. VirtualKeyboard)
|
|
local tap_interval = self.input.tap_interval_override or ges_tap_interval
|
|
-- We do tap bounce detection even when double tap is enabled (so, double tap
|
|
-- is triggered when: ges_tap_interval <= delay < ges_double_tap_interval)
|
|
if not tap_interval:isZero() and self.last_taps[slot] ~= nil and self:isTapBounce(self.last_taps[slot], cur_tap, tap_interval) then
|
|
logger.dbg("tap bounce detected in slot", slot, ": ignored")
|
|
-- Simply ignore it, and clear state as this is the end of a touch event
|
|
-- (this doesn't clear self.last_taps[slot], so a 3rd tap can be detected
|
|
-- as a double tap)
|
|
self:clearState(slot)
|
|
return
|
|
end
|
|
|
|
if not self.input.disable_double_tap and self.last_taps[slot] ~= nil and
|
|
self:isDoubleTap(self.last_taps[slot], cur_tap) then
|
|
-- it is a double tap
|
|
self:clearState(slot)
|
|
self.input:clearTimeout(slot, "double_tap")
|
|
ges_ev.ges = "double_tap"
|
|
self.last_taps[slot] = nil
|
|
logger.dbg("double tap detected in slot", slot)
|
|
return ges_ev
|
|
end
|
|
|
|
-- set current tap to last tap
|
|
self.last_taps[slot] = cur_tap
|
|
|
|
if self.input.disable_double_tap then
|
|
-- We can send the event immediately (no need for the
|
|
-- timer stuff needed for double tap support)
|
|
logger.dbg("single tap detected in slot", slot, ges_ev.pos)
|
|
self:clearState(slot)
|
|
return ges_ev
|
|
end
|
|
|
|
-- Double tap enabled: we can't send this single tap immediately as it
|
|
-- may be the start of a double tap. We'll send it as a single tap after
|
|
-- a timer if no second tap happened in the double tap delay.
|
|
logger.dbg("set up single/double tap timer")
|
|
-- setTimeout will handle computing the deadline in the least lossy way possible given the platform.
|
|
self.input:setTimeout(slot, "double_tap", function()
|
|
logger.dbg("in single/double tap timer, single tap:", self.last_taps[slot] ~= nil)
|
|
-- double tap will set last_tap to nil so if it is not, then
|
|
-- user has not double-tap'ed: it's a single tap
|
|
if self.last_taps[slot] ~= nil then
|
|
self.last_taps[slot] = nil
|
|
-- we are using closure here
|
|
logger.dbg("single tap detected in slot", slot, ges_ev.pos)
|
|
return ges_ev
|
|
end
|
|
end, tev.timev, ges_double_tap_interval)
|
|
-- we are already at the end of touch event
|
|
-- so reset the state
|
|
self:clearState(slot)
|
|
end
|
|
|
|
function GestureDetector:handleNonTap(tev)
|
|
local slot = tev.slot
|
|
if self.states[slot] ~= self.tapState then
|
|
-- switched from other state, probably from initialState
|
|
-- we return nil in this case
|
|
self.states[slot] = self.tapState
|
|
logger.dbg("set up hold timer")
|
|
-- Invalidate previous hold timers on that slot so that the following setTimeout will only react to *this* tapState.
|
|
self.input:clearTimeout(slot, "hold")
|
|
self.pending_hold_timer[slot] = true
|
|
self.input:setTimeout(slot, "hold", function()
|
|
-- If the pending_hold_timer we set on our first switch to tapState on this slot (e.g., first finger down event),
|
|
-- back when the timer was setup, is still relevant (e.g., the slot wasn't run through clearState by a finger up gesture),
|
|
-- then check that we're still in a stationary finger down state (e.g., tapState).
|
|
if self.pending_hold_timer[slot] and self.states[slot] == self.tapState then
|
|
-- That means we can switch to hold
|
|
logger.dbg("hold gesture detected in slot", slot)
|
|
self.pending_hold_timer[slot] = nil
|
|
return self:switchState("holdState", tev, true)
|
|
end
|
|
end, tev.timev, ges_hold_interval)
|
|
return {
|
|
ges = "touch",
|
|
pos = Geom:new{
|
|
x = tev.x,
|
|
y = tev.y,
|
|
w = 0, h = 0,
|
|
},
|
|
time = tev.timev,
|
|
}
|
|
else
|
|
-- We're still inside a stream of input events, see if we need to switch to other states.
|
|
if (tev.x and math.abs(tev.x - self.first_tevs[slot].x) >= self.PAN_THRESHOLD) or
|
|
(tev.y and math.abs(tev.y - self.first_tevs[slot].y) >= self.PAN_THRESHOLD) then
|
|
-- If user's finger moved far enough on the X or Y axes, switch to pan state.
|
|
return self:switchState("panState", tev)
|
|
end
|
|
end
|
|
end
|
|
|
|
function GestureDetector:panState(tev)
|
|
logger.dbg("in pan state...")
|
|
local slot = tev.slot
|
|
if tev.id == -1 then
|
|
-- end of pan, signal swipe gesture if necessary
|
|
if self:isSwipe(slot) then
|
|
local s1 = self.input.main_finger_slot
|
|
local s2 = self.input.main_finger_slot + 1
|
|
if self.detectings[s1] and self.detectings[s2] then
|
|
local ges_ev = self:handleTwoFingerPan(tev)
|
|
self:clearStates()
|
|
if ges_ev then
|
|
if ges_ev.ges == "two_finger_pan" then
|
|
ges_ev.ges = "two_finger_swipe"
|
|
elseif ges_ev.ges == "inward_pan" then
|
|
ges_ev.ges = "pinch"
|
|
elseif ges_ev.ges == "outward_pan" then
|
|
ges_ev.ges = "spread"
|
|
end
|
|
logger.dbg(ges_ev.ges, ges_ev.direction, ges_ev.distance, "detected")
|
|
end
|
|
return ges_ev
|
|
else
|
|
return self:handleSwipe(tev)
|
|
end
|
|
else -- if end of pan is not swipe then it must be pan release.
|
|
return self:handlePanRelease(tev)
|
|
end
|
|
else
|
|
if self.states[slot] ~= self.panState then
|
|
self.states[slot] = self.panState
|
|
end
|
|
return self:handlePan(tev)
|
|
end
|
|
end
|
|
|
|
function GestureDetector:handleSwipe(tev)
|
|
local slot = tev.slot
|
|
local swipe_direction, swipe_distance = self:getPath(slot)
|
|
local start_pos = Geom:new{
|
|
x = self.first_tevs[slot].x,
|
|
y = self.first_tevs[slot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
local ges = "swipe"
|
|
local multiswipe_directions
|
|
|
|
if #self.multiswipe_directions > 1 then
|
|
ges = "multiswipe"
|
|
multiswipe_directions = ""
|
|
for k, v in ipairs(self.multiswipe_directions) do
|
|
local sep = ""
|
|
if k > 1 then
|
|
sep = " "
|
|
end
|
|
multiswipe_directions = multiswipe_directions .. sep .. v[1]
|
|
end
|
|
logger.dbg("multiswipe", multiswipe_directions)
|
|
end
|
|
|
|
--- @todo dirty hack for some weird devices, replace it with better solution
|
|
if swipe_direction == "west" and DCHANGE_WEST_SWIPE_TO_EAST then
|
|
swipe_direction = "east"
|
|
elseif swipe_direction == "east" and DCHANGE_EAST_SWIPE_TO_WEST then
|
|
swipe_direction = "west"
|
|
end
|
|
logger.dbg("swipe", swipe_direction, swipe_distance, "detected in slot", slot)
|
|
self:clearState(slot)
|
|
return {
|
|
ges = ges,
|
|
-- use first pan tev coordination as swipe start point
|
|
pos = start_pos,
|
|
direction = swipe_direction,
|
|
multiswipe_directions = multiswipe_directions,
|
|
distance = swipe_distance,
|
|
time = tev.timev,
|
|
}
|
|
end
|
|
|
|
function GestureDetector:handlePan(tev)
|
|
local slot = tev.slot
|
|
local s1 = self.input.main_finger_slot
|
|
local s2 = self.input.main_finger_slot + 1
|
|
if self.detectings[s1] and self.detectings[s2] then
|
|
return self:handleTwoFingerPan(tev)
|
|
else
|
|
local pan_direction, pan_distance = self:getPath(slot)
|
|
local pan_ev = {
|
|
ges = "pan",
|
|
relative = {
|
|
-- default to pan 0
|
|
x = 0,
|
|
y = 0,
|
|
},
|
|
pos = nil,
|
|
direction = pan_direction,
|
|
distance = pan_distance,
|
|
time = tev.timev,
|
|
}
|
|
|
|
-- regular pan
|
|
pan_ev.relative.x = tev.x - self.first_tevs[slot].x
|
|
pan_ev.relative.y = tev.y - self.first_tevs[slot].y
|
|
|
|
pan_ev.pos = Geom:new{
|
|
x = self.last_tevs[slot].x,
|
|
y = self.last_tevs[slot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
|
|
local msd_cnt = #self.multiswipe_directions
|
|
local msd_direction_prev = (msd_cnt > 0) and self.multiswipe_directions[msd_cnt][1] or ""
|
|
local prev_ms_ev, fake_first_tev
|
|
|
|
if msd_cnt == 0 then
|
|
-- determine whether to initiate a straight or diagonal multiswipe
|
|
self.multiswipe_type = "straight"
|
|
if pan_direction ~= "north" and pan_direction ~= "south"
|
|
and pan_direction ~= "east" and pan_direction ~= "west" then
|
|
self.multiswipe_type = "diagonal"
|
|
end
|
|
-- recompute a more accurate direction and distance in a multiswipe context
|
|
elseif msd_cnt > 0 then
|
|
prev_ms_ev = self.multiswipe_directions[msd_cnt][2]
|
|
fake_first_tev = {
|
|
[slot] = {
|
|
["x"] = prev_ms_ev.pos.x,
|
|
["y"] = prev_ms_ev.pos.y,
|
|
["slot"] = slot,
|
|
},
|
|
}
|
|
end
|
|
|
|
-- the first time fake_first_tev is nil, so self.first_tevs is automatically used instead
|
|
local msd_direction, msd_distance
|
|
if self.multiswipe_type == "straight" then
|
|
msd_direction, msd_distance = self:getPath(slot, true, false, fake_first_tev)
|
|
else
|
|
msd_direction, msd_distance = self:getPath(slot, true, true, fake_first_tev)
|
|
end
|
|
|
|
if msd_distance > self.MULTISWIPE_THRESHOLD then
|
|
local pan_ev_multiswipe = pan_ev
|
|
-- store a copy of pan_ev without rotation adjustment
|
|
-- for multiswipe calculations when rotated
|
|
if self.screen:getTouchRotation() > self.screen.ORIENTATION_PORTRAIT then
|
|
pan_ev_multiswipe = util.tableDeepCopy(pan_ev)
|
|
end
|
|
if msd_direction ~= msd_direction_prev then
|
|
self.multiswipe_directions[msd_cnt+1] = {
|
|
[1] = msd_direction,
|
|
[2] = pan_ev_multiswipe,
|
|
}
|
|
-- update ongoing swipe direction to the new maximum
|
|
else
|
|
self.multiswipe_directions[msd_cnt] = {
|
|
[1] = msd_direction,
|
|
[2] = pan_ev_multiswipe,
|
|
}
|
|
end
|
|
end
|
|
|
|
return pan_ev
|
|
end
|
|
end
|
|
|
|
function GestureDetector:handleTwoFingerPan(tev)
|
|
local s1 = self.input.main_finger_slot
|
|
local s2 = self.input.main_finger_slot + 1
|
|
-- triggering slot
|
|
local tslot = tev.slot
|
|
-- reference slot
|
|
local rslot = tslot == s2 and s1 or s2
|
|
local tpan_dir, tpan_dis = self:getPath(tslot)
|
|
local tstart_pos = Geom:new{
|
|
x = self.first_tevs[tslot].x,
|
|
y = self.first_tevs[tslot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
local tend_pos = Geom:new{
|
|
x = self.last_tevs[tslot].x,
|
|
y = self.last_tevs[tslot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
local rstart_pos = Geom:new{
|
|
x = self.first_tevs[rslot].x,
|
|
y = self.first_tevs[rslot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
if self.states[rslot] == self.panState then
|
|
local rpan_dir, rpan_dis = self:getPath(rslot)
|
|
local rend_pos = Geom:new{
|
|
x = self.last_tevs[rslot].x,
|
|
y = self.last_tevs[rslot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
local start_distance = tstart_pos:distance(rstart_pos)
|
|
local end_distance = tend_pos:distance(rend_pos)
|
|
local ges_ev = {
|
|
ges = "two_finger_pan",
|
|
-- use midpoint of tstart and rstart as swipe start point
|
|
pos = tstart_pos:midpoint(rstart_pos),
|
|
distance = tpan_dis + rpan_dis,
|
|
direction = tpan_dir,
|
|
time = tev.timev,
|
|
}
|
|
if tpan_dir ~= rpan_dir then
|
|
if start_distance > end_distance then
|
|
ges_ev.ges = "inward_pan"
|
|
else
|
|
ges_ev.ges = "outward_pan"
|
|
end
|
|
ges_ev.direction = self.DIRECTION_TABLE[tpan_dir]
|
|
end
|
|
logger.dbg(ges_ev.ges, ges_ev.direction, ges_ev.distance, "detected")
|
|
return ges_ev
|
|
elseif self.states[rslot] == self.holdState then
|
|
local angle = self:getRotate(rstart_pos, tstart_pos, tend_pos)
|
|
logger.dbg("rotate", angle, "detected")
|
|
return {
|
|
ges = "rotate",
|
|
pos = rstart_pos,
|
|
angle = angle,
|
|
time = tev.timev,
|
|
}
|
|
end
|
|
end
|
|
|
|
function GestureDetector:handlePanRelease(tev)
|
|
local slot = tev.slot
|
|
local release_pos = Geom:new{
|
|
x = self.last_tevs[slot].x,
|
|
y = self.last_tevs[slot].y,
|
|
w = 0, h = 0,
|
|
}
|
|
local pan_ev = {
|
|
ges = "pan_release",
|
|
pos = release_pos,
|
|
time = tev.timev,
|
|
}
|
|
local s1 = self.input.main_finger_slot
|
|
local s2 = self.input.main_finger_slot + 1
|
|
if self.detectings[s1] and self.detectings[s2] then
|
|
logger.dbg("two finger pan release detected")
|
|
pan_ev.ges = "two_finger_pan_release"
|
|
self:clearStates()
|
|
else
|
|
logger.dbg("pan release detected in slot", slot)
|
|
self:clearState(slot)
|
|
end
|
|
return pan_ev
|
|
end
|
|
|
|
function GestureDetector:holdState(tev, hold)
|
|
logger.dbg("in hold state...")
|
|
local slot = tev.slot
|
|
-- When we switch to hold state, we pass an additional boolean param "hold".
|
|
if tev.id ~= -1 and hold and self.last_tevs[slot].x and self.last_tevs[slot].y then
|
|
self.states[slot] = self.holdState
|
|
return {
|
|
ges = "hold",
|
|
pos = Geom:new{
|
|
x = self.last_tevs[slot].x,
|
|
y = self.last_tevs[slot].y,
|
|
w = 0, h = 0,
|
|
},
|
|
time = tev.timev,
|
|
}
|
|
elseif tev.id == -1 and self.last_tevs[slot] ~= nil then
|
|
-- end of hold, signal hold release
|
|
logger.dbg("hold_release detected in slot", slot)
|
|
local last_x = self.last_tevs[slot].x
|
|
local last_y = self.last_tevs[slot].y
|
|
self:clearState(slot)
|
|
return {
|
|
ges = "hold_release",
|
|
pos = Geom:new{
|
|
x = last_x,
|
|
y = last_y,
|
|
w = 0, h = 0,
|
|
},
|
|
time = tev.timev,
|
|
}
|
|
elseif (tev.x and math.abs(tev.x - self.first_tevs[slot].x) >= self.PAN_THRESHOLD) or
|
|
(tev.y and math.abs(tev.y - self.first_tevs[slot].y) >= self.PAN_THRESHOLD) then
|
|
local ges_ev = self:handlePan(tev)
|
|
if ges_ev ~= nil then ges_ev.ges = "hold_pan" end
|
|
return ges_ev
|
|
end
|
|
end
|
|
|
|
local ges_coordinate_translation_270 = {
|
|
north = "west",
|
|
south = "east",
|
|
east = "north",
|
|
west = "south",
|
|
northeast = "northwest",
|
|
northwest = "southwest",
|
|
southeast = "northeast",
|
|
southwest = "southeast",
|
|
}
|
|
local ges_coordinate_translation_180 = {
|
|
north = "south",
|
|
south = "north",
|
|
east = "west",
|
|
west = "east",
|
|
northeast = "southwest",
|
|
northwest = "southeast",
|
|
southeast = "northwest",
|
|
southwest = "northeast",
|
|
}
|
|
local ges_coordinate_translation_90 = {
|
|
north = "east",
|
|
south = "west",
|
|
east = "south",
|
|
west = "north",
|
|
northeast = "southeast",
|
|
northwest = "northeast",
|
|
southeast = "southwest",
|
|
southwest = "northwest",
|
|
}
|
|
local function translateGesDirCoordinate(direction, translation_table)
|
|
return translation_table[direction]
|
|
end
|
|
local function translateMultiswipeGesDirCoordinate(multiswipe_directions, translation_table)
|
|
return multiswipe_directions:gsub("%S+", translation_table)
|
|
end
|
|
|
|
--[[--
|
|
Changes gesture's `x` and `y` coordinates according to screen view mode.
|
|
|
|
@param ges gesture that you want to adjust
|
|
@return adjusted gesture.
|
|
--]]
|
|
function GestureDetector:adjustGesCoordinate(ges)
|
|
local mode = self.screen:getTouchRotation()
|
|
if mode == self.screen.ORIENTATION_LANDSCAPE then
|
|
-- in landscape mode rotated 90
|
|
if ges.pos then
|
|
ges.pos.x, ges.pos.y = (self.screen:getWidth() - ges.pos.y), (ges.pos.x)
|
|
end
|
|
if ges.ges == "swipe" or ges.ges == "pan"
|
|
or ges.ges == "multiswipe"
|
|
or ges.ges == "two_finger_swipe"
|
|
or ges.ges == "two_finger_pan"
|
|
then
|
|
ges.direction = translateGesDirCoordinate(ges.direction, ges_coordinate_translation_90)
|
|
if ges.ges == "multiswipe" then
|
|
ges.multiswipe_directions = translateMultiswipeGesDirCoordinate(ges.multiswipe_directions, ges_coordinate_translation_90)
|
|
end
|
|
if ges.relative then
|
|
ges.relative.x, ges.relative.y = -ges.relative.y, ges.relative.x
|
|
end
|
|
elseif ges.ges == "pinch" or ges.ges == "spread"
|
|
or ges.ges == "inward_pan"
|
|
or ges.ges == "outward_pan" then
|
|
if ges.direction == "horizontal" then
|
|
ges.direction = "vertical"
|
|
elseif ges.direction == "vertical" then
|
|
ges.direction = "horizontal"
|
|
end
|
|
end
|
|
elseif mode == self.screen.ORIENTATION_LANDSCAPE_ROTATED then
|
|
-- in landscape mode rotated 270
|
|
if ges.pos then
|
|
ges.pos.x, ges.pos.y = (ges.pos.y), (self.screen:getHeight() - ges.pos.x)
|
|
end
|
|
if ges.ges == "swipe" or ges.ges == "pan"
|
|
or ges.ges == "multiswipe"
|
|
or ges.ges == "two_finger_swipe"
|
|
or ges.ges == "two_finger_pan"
|
|
then
|
|
ges.direction = translateGesDirCoordinate(ges.direction, ges_coordinate_translation_270)
|
|
if ges.ges == "multiswipe" then
|
|
ges.multiswipe_directions = translateMultiswipeGesDirCoordinate(ges.multiswipe_directions, ges_coordinate_translation_270)
|
|
end
|
|
if ges.relative then
|
|
ges.relative.x, ges.relative.y = ges.relative.y, -ges.relative.x
|
|
end
|
|
elseif ges.ges == "pinch" or ges.ges == "spread"
|
|
or ges.ges == "inward_pan"
|
|
or ges.ges == "outward_pan" then
|
|
if ges.direction == "horizontal" then
|
|
ges.direction = "vertical"
|
|
elseif ges.direction == "vertical" then
|
|
ges.direction = "horizontal"
|
|
end
|
|
end
|
|
elseif mode == self.screen.ORIENTATION_PORTRAIT_ROTATED then
|
|
-- in portrait mode rotated 180
|
|
if ges.pos then
|
|
ges.pos.x, ges.pos.y = (self.screen:getWidth() - ges.pos.x), (self.screen:getHeight() - ges.pos.y)
|
|
end
|
|
if ges.ges == "swipe" or ges.ges == "pan"
|
|
or ges.ges == "multiswipe"
|
|
or ges.ges == "two_finger_swipe"
|
|
or ges.ges == "two_finger_pan"
|
|
then
|
|
ges.direction = translateGesDirCoordinate(ges.direction, ges_coordinate_translation_180)
|
|
if ges.ges == "multiswipe" then
|
|
ges.multiswipe_directions = translateMultiswipeGesDirCoordinate(ges.multiswipe_directions, ges_coordinate_translation_180)
|
|
end
|
|
if ges.relative then
|
|
ges.relative.x, ges.relative.y = -ges.relative.x, -ges.relative.y
|
|
end
|
|
elseif ges.ges == "pinch" or ges.ges == "spread"
|
|
or ges.ges == "inward_pan"
|
|
or ges.ges == "outward_pan" then
|
|
if ges.direction == "horizontal" then
|
|
ges.direction = "horizontal"
|
|
elseif ges.direction == "vertical" then
|
|
ges.direction = "vertical"
|
|
end
|
|
end
|
|
end
|
|
logger.dbg("adjusted ges:", ges.ges, ges.multiswipe_directions or ges.direction)
|
|
return ges
|
|
end
|
|
|
|
return GestureDetector
|