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77 lines
2.0 KiB
Lua
77 lines
2.0 KiB
Lua
-- Copyright (c) 2023 Maksim Tuprikov <insality@gmail.com>. This code is licensed under MIT license
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--- Component with event on back and backspace button.
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-- # Overview #
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--
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-- Back Handler is recommended to put in every game window to close it
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-- or in main screen to call settings window.
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--
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-- # Notes #
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--
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-- • Back Handler inheritance @{BaseComponent}, you can use all of its methods in addition to those described here.
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--
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-- • Back Handler react on release action ACTION_BACK or ACTION_BACKSPACE
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-- @usage
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-- local callback = function(self, params) ... end
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--
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-- local params = {}
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-- local back_handler = self.druid:new_back_handler(callback, [params])
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-- @module BackHandler
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-- @within BaseComponent
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-- @alias druid.back_handler
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--- @{DruidEvent} Event on back handler action.
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--
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-- Trigger on input action ACTION_BACK or ACTION_BACKSPACE
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-- @usage
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-- -- Subscribe additional callbacks:
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-- back_handler.on_back:subscribe(callback)
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-- @tfield DruidEvent on_back @{DruidEvent}
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--- Custom args to pass in the callback
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-- @usage
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-- -- Replace params on runtime:
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-- back_handler.params = { ... }
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-- @tfield[opt] any params
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---
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local Event = require("druid.event")
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local const = require("druid.const")
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local component = require("druid.component")
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local BackHandler = component.create("back_handler")
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--- @{BackHandler} constructor
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-- @tparam BackHandler self @{BackHandler}
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-- @tparam callback callback On back button
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-- @tparam[opt] any custom_args Button events custom arguments
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-- @local
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function BackHandler.init(self, callback, custom_args)
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self.params = custom_args
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self.on_back = Event(callback)
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end
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--- Component input handler
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-- @tparam BackHandler self @{BackHandler}
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-- @tparam string action_id on_input action id
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-- @tparam table action on_input action
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-- @local
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function BackHandler.on_input(self, action_id, action)
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if not action[const.RELEASED] then
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return false
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end
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if action_id == const.ACTION_BACK or action_id == const.ACTION_BACKSPACE then
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self.on_back:trigger(self:get_context(), self.params)
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return true
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end
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return false
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end
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return BackHandler
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