mirror of
https://github.com/koreader/koreader
synced 2024-11-13 19:11:25 +00:00
726 lines
24 KiB
Lua
726 lines
24 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 build 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 GestureDetector = {
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-- must be initialized with the Input singleton class
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input = nil,
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-- all the time parameters are in us
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DOUBLE_TAP_INTERVAL = 300 * 1000,
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TWO_FINGER_TAP_DURATION = 300 * 1000,
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HOLD_INTERVAL = 500 * 1000,
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SWIPE_INTERVAL = 900 * 1000,
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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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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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-- 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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}
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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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-- distance parameters
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self.DOUBLE_TAP_DISTANCE = 50 * self.screen:getDPI() / 167
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self.TWO_FINGER_TAP_REGION = 20 * self.screen:getDPI() / 167
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self.PAN_THRESHOLD = 50 * self.screen:getDPI() / 167
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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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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 = TimeVal:new{
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sec = tev.timev.sec,
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usec = tev.timev.usec,
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}
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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:isDoubleTap(tap1, tap2)
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local tv_diff = tap2.timev - tap1.timev
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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.sec == 0 and (tv_diff.usec) < self.DOUBLE_TAP_INTERVAL)
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)
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end
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function GestureDetector:isTwoFingerTap()
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if self.last_tevs[0] == nil or self.last_tevs[1] == 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[0].x - self.first_tevs[0].x)
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local x_diff1 = math.abs(self.last_tevs[1].x - self.first_tevs[1].x)
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local y_diff0 = math.abs(self.last_tevs[0].y - self.first_tevs[0].y)
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local y_diff1 = math.abs(self.last_tevs[1].y - self.first_tevs[1].y)
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local tv_diff0 = self.last_tevs[0].timev - self.first_tevs[0].timev
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local tv_diff1 = self.last_tevs[1].timev - self.first_tevs[1].timev
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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.sec == 0 and tv_diff0.usec < self.TWO_FINGER_TAP_DURATION and
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tv_diff1.sec == 0 and tv_diff1.usec < self.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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@return (direction, distance) pan direction and distance
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--]]
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function GestureDetector:getPath(slot)
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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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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 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) 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.first_tevs[slot].timev - self.last_tevs[slot].timev
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if (tv_diff.sec == 0) and (tv_diff.usec < self.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.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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end
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function GestureDetector:clearStates()
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self:clearState(0)
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self:clearState(1)
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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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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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Handles both single and double tap.
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--]]
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function GestureDetector:tapState(tev)
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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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-- end of tap event
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if self.detectings[0] and self.detectings[1] 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[0].x,
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y = self.last_tevs[0].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[1].x,
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y = self.last_tevs[1].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,
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}
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else
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self:clearState(slot)
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end
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elseif self.last_tevs[slot] ~= nil then
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return self:handleDoubleTap(tev)
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else
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-- last tev in this slot is cleared by last two finger tap
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self:clearState(slot)
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return {
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ges = "tap",
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pos = Geom:new{
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x = tev.x,
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y = tev.y,
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w = 0, h = 0,
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},
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time = tev.timev,
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}
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end
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else
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return self:handleNonTap(tev)
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end
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end
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function GestureDetector:handleDoubleTap(tev)
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local slot = tev.slot
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local ges_ev = {
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-- default to single tap
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ges = "tap",
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pos = Geom:new{
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x = self.last_tevs[slot].x,
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y = self.last_tevs[slot].y,
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w = 0, h = 0,
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},
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time = tev.timev,
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}
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-- cur_tap is used for double tap detection
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local cur_tap = {
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x = tev.x,
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y = tev.y,
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timev = tev.timev,
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}
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if not self.input.disable_double_tap and self.last_taps[slot] ~= nil and
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self:isDoubleTap(self.last_taps[slot], cur_tap) then
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-- it is a double tap
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self:clearState(slot)
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ges_ev.ges = "double_tap"
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self.last_taps[slot] = nil
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logger.dbg("double tap detected in slot", slot)
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return ges_ev
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end
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-- set current tap to last tap
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self.last_taps[slot] = cur_tap
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logger.dbg("set up tap timer")
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-- deadline should be calculated by adding current tap time and the interval
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local deadline = cur_tap.timev + TimeVal:new{
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sec = 0,
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usec = not self.input.disable_double_tap and self.DOUBLE_TAP_INTERVAL or 0,
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}
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self.input:setTimeout(function()
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logger.dbg("in tap timer", self.last_taps[slot] ~= nil)
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-- double tap will set last_tap to nil so if it is not, then
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-- user must only tapped once
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if self.last_taps[slot] ~= nil then
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self.last_taps[slot] = nil
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-- we are using closure here
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logger.dbg("single tap detected in slot", slot, ges_ev.pos)
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return ges_ev
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end
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end, deadline)
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-- we are already at the end of touch event
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-- so reset the state
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self:clearState(slot)
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end
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function GestureDetector:handleNonTap(tev)
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local slot = tev.slot
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if self.states[slot] ~= self.tapState then
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-- switched from other state, probably from initialState
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-- we return nil in this case
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self.states[slot] = self.tapState
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logger.dbg("set up hold timer")
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local deadline = tev.timev + TimeVal:new{
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sec = 0, usec = self.HOLD_INTERVAL
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}
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self.input:setTimeout(function()
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if self.states[slot] == self.tapState then
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-- timer set in tapState, so we switch to hold
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logger.dbg("hold gesture detected in slot", slot)
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return self:switchState("holdState", tev, true)
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end
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end, deadline)
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return {
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ges = "touch",
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pos = Geom:new{
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x = tev.x,
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y = tev.y,
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w = 0, h = 0,
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},
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time = tev.timev,
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}
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else
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-- it is not end of touch event, see if we need to switch to
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-- other states
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if (tev.x and math.abs(tev.x - self.first_tevs[slot].x) >= self.PAN_THRESHOLD) or
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(tev.y and math.abs(tev.y - self.first_tevs[slot].y) >= self.PAN_THRESHOLD) then
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-- if user's finger moved long enough in X or
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-- Y distance, we switch to pan state
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return self:switchState("panState", tev)
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end
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end
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end
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function GestureDetector:panState(tev)
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logger.dbg("in pan state...")
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local slot = tev.slot
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if tev.id == -1 then
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-- end of pan, signal swipe gesture if necessary
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if self:isSwipe(slot) then
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if self.detectings[0] and self.detectings[1] then
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local ges_ev = self:handleTwoFingerPan(tev)
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self:clearStates()
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if ges_ev then
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if ges_ev.ges == "two_finger_pan" then
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ges_ev.ges = "two_finger_swipe"
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elseif ges_ev.ges == "inward_pan" then
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ges_ev.ges = "pinch"
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elseif ges_ev.ges == "outward_pan" then
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ges_ev.ges = "spread"
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end
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logger.dbg(ges_ev.ges, ges_ev.direction, ges_ev.distance, "detected")
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end
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return ges_ev
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else
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return self:handleSwipe(tev)
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end
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else -- if end of pan is not swipe then it must be pan release.
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return self:handlePanRelease(tev)
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end
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else
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if self.states[slot] ~= self.panState then
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self.states[slot] = self.panState
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end
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return self:handlePan(tev)
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end
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end
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function GestureDetector:handleSwipe(tev)
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local slot = tev.slot
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local swipe_direction, swipe_distance = self:getPath(slot)
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local start_pos = Geom:new{
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x = self.first_tevs[slot].x,
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y = self.first_tevs[slot].y,
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w = 0, h = 0,
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}
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-- TODO: dirty hack for some weird devices, replace it with better solution
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if swipe_direction == "west" and DCHANGE_WEST_SWIPE_TO_EAST then
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swipe_direction = "east"
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elseif swipe_direction == "east" and DCHANGE_EAST_SWIPE_TO_WEST then
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swipe_direction = "west"
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end
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logger.dbg("swipe", swipe_direction, swipe_distance, "detected in slot", slot)
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self:clearState(slot)
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return {
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ges = "swipe",
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-- use first pan tev coordination as swipe start point
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pos = start_pos,
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direction = swipe_direction,
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distance = swipe_distance,
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time = tev.timev,
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}
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end
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function GestureDetector:handlePan(tev)
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local slot = tev.slot
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if self.detectings[0] and self.detectings[1] then
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return self:handleTwoFingerPan(tev)
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else
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local pan_direction, pan_distance = self:getPath(slot)
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local pan_ev = {
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ges = "pan",
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relative = {
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-- default to pan 0
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x = 0,
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y = 0,
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},
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pos = nil,
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direction = pan_direction,
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distance = pan_distance,
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time = tev.timev,
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}
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pan_ev.relative.x = tev.x - self.first_tevs[slot].x
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pan_ev.relative.y = tev.y - self.first_tevs[slot].y
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pan_ev.pos = Geom:new{
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x = self.last_tevs[slot].x,
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y = self.last_tevs[slot].y,
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w = 0, h = 0,
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}
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return pan_ev
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end
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end
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function GestureDetector:handleTwoFingerPan(tev)
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-- triggering slot
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local tslot = tev.slot
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-- reference slot
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local rslot = tslot == 1 and 0 or 1
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local tpan_dir, tpan_dis = self:getPath(tslot)
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local tstart_pos = Geom:new{
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x = self.first_tevs[tslot].x,
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y = self.first_tevs[tslot].y,
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w = 0, h = 0,
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}
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local tend_pos = Geom:new{
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x = self.last_tevs[tslot].x,
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y = self.last_tevs[tslot].y,
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w = 0, h = 0,
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}
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local rstart_pos = Geom:new{
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|
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,
|
|
}
|
|
if self.detectings[0] and self.detectings[1] 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 additional 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
|
|
|
|
--[[--
|
|
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)
|
|
if self.screen.cur_rotation_mode == 1 then
|
|
-- in landscape mode rotated 270
|
|
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 == "two_finger_swipe"
|
|
or ges.ges == "two_finger_pan" then
|
|
if ges.direction == "north" then
|
|
ges.direction = "east"
|
|
elseif ges.direction == "south" then
|
|
ges.direction = "west"
|
|
elseif ges.direction == "east" then
|
|
ges.direction = "south"
|
|
elseif ges.direction == "west" then
|
|
ges.direction = "north"
|
|
elseif ges.direction == "northeast" then
|
|
ges.direction = "southeast"
|
|
elseif ges.direction == "northwest" then
|
|
ges.direction = "northeast"
|
|
elseif ges.direction == "southeast" then
|
|
ges.direction = "southwest"
|
|
elseif ges.direction == "southwest" then
|
|
ges.direction = "northwest"
|
|
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 self.screen.cur_rotation_mode == 3 then
|
|
-- in landscape mode rotated 90
|
|
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 == "two_finger_swipe"
|
|
or ges.ges == "two_finger_pan" then
|
|
if ges.direction == "north" then
|
|
ges.direction = "west"
|
|
elseif ges.direction == "south" then
|
|
ges.direction = "east"
|
|
elseif ges.direction == "east" then
|
|
ges.direction = "north"
|
|
elseif ges.direction == "west" then
|
|
ges.direction = "south"
|
|
elseif ges.direction == "northeast" then
|
|
ges.direction = "northwest"
|
|
elseif ges.direction == "northwest" then
|
|
ges.direction = "southeast"
|
|
elseif ges.direction == "southeast" then
|
|
ges.direction = "northeast"
|
|
elseif ges.direction == "southwest" then
|
|
ges.direction = "southeast"
|
|
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 self.screen.cur_rotation_mode == 2 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 == "two_finger_swipe"
|
|
or ges.ges == "two_finger_pan" then
|
|
if ges.direction == "north" then
|
|
ges.direction = "south"
|
|
elseif ges.direction == "south" then
|
|
ges.direction = "north"
|
|
elseif ges.direction == "east" then
|
|
ges.direction = "west"
|
|
elseif ges.direction == "west" then
|
|
ges.direction = "east"
|
|
elseif ges.direction == "northeast" then
|
|
ges.direction = "southwest"
|
|
elseif ges.direction == "northwest" then
|
|
ges.direction = "southeast"
|
|
elseif ges.direction == "southeast" then
|
|
ges.direction = "northwest"
|
|
elseif ges.direction == "southwest" then
|
|
ges.direction = "northeast"
|
|
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
|
|
return ges
|
|
end
|
|
|
|
return GestureDetector
|