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5fcb804d47
Emulate the hold touch behavior on non touch device by clicking the right key ButtonTable: do not add vertical separator to the layout because the focus manager can't traverse them. Add check to make disabled button non-clickable.
106 lines
3.7 KiB
Lua
106 lines
3.7 KiB
Lua
local Event = require("ui/event")
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local InputContainer = require("ui/widget/container/inputcontainer")
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local logger = require("logger")
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local UIManager = require("ui/uimanager")
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--[[
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Wrapper Widget that manages focus for a whole dialog
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supports a 2D model of active elements
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e.g.:
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layout = {
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{ textinput, textinput, item },
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{ okbutton, cancelbutton, item },
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{ nil, item, nil },
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{ nil, item, nil },
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{ nil, item, nil },
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}
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Navigate the layout by trying to avoid not set or nil value.
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Provide a simple wrap around in the vertical direction.
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The first element of the first table must be valid to ensure
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to not get stuck in an invalid position.
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but notice that this does _not_ do the layout for you,
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it rather defines an abstract layout.
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]]
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local FocusManager = InputContainer:new{
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selected = nil, -- defaults to x=1, y=1
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layout = nil, -- mandatory
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movement_allowed = { x = true, y = true }
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}
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function FocusManager:init()
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if not self.selected then
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self.selected = { x = 1, y = 1 }
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end
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self.key_events = {
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-- these will all generate the same event, just with different arguments
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FocusUp = { {"Up"}, doc = "move focus up", event = "FocusMove", args = {0, -1} },
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FocusDown = { {"Down"}, doc = "move focus down", event = "FocusMove", args = {0, 1} },
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FocusLeft = { {"Left"}, doc = "move focus left", event = "FocusMove", args = {-1, 0} },
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FocusRight = { {"Right"}, doc = "move focus right", event = "FocusMove", args = {1, 0} },
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}
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end
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function FocusManager:onFocusMove(args)
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local dx, dy = unpack(args)
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if (dx ~= 0 and not self.movement_allowed.x)
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or (dy ~= 0 and not self.movement_allowed.y) then
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return true
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end
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if not self.layout or not self.layout[self.selected.y] or not self.layout[self.selected.y][self.selected.x] then
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return true
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end
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local current_item = self.layout[self.selected.y][self.selected.x]
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while true do
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if not self.layout[self.selected.y + dy] then
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--horizontal border, try to wraparound
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if not self:wrapAround(dy) then
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break
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end
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elseif not self.layout[self.selected.y + dy][self.selected.x + dx] then
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--vertical border, no wraparound
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break
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else
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self.selected.y = self.selected.y + dy
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self.selected.x = self.selected.x + dx
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logger.dbg("Cursor position : ".. self.selected.y .." : "..self.selected.x)
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end
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if self.layout[self.selected.y][self.selected.x] ~= current_item
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or not self.layout[self.selected.y][self.selected.x].is_inactive then
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-- we found a different object to focus
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current_item:handleEvent(Event:new("Unfocus"))
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self.layout[self.selected.y][self.selected.x]:handleEvent(Event:new("Focus"))
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-- trigger a fast repaint, this seem to not count toward a fullscreen eink resfresh
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-- TODO: is this really needed?
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UIManager:setDirty(self.show_parent or self, "fast")
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break
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end
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end
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return true
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end
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function FocusManager:wrapAround(dy)
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--go to the last valid item directly above or below the current item
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--return false if none could be found
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local y = self.selected.y
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while self.layout[y - dy] and self.layout[y - dy][self.selected.x] do
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y = y - dy
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end
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if y ~= self.selected.y then
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self.selected.y = y
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return true
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else
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return false
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end
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end
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function FocusManager:getFocusItem()
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return self.layout[self.selected.y][self.selected.x]
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end
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return FocusManager
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