uimanager: Basic UI Manager for DPI and similar

2019-01-12 20:26:41 +01:00
parent 7ce9df68ec
commit c8a4d63fda
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+--[[
+	The MIT License (MIT)
+	
+	Copyright (c) 2015-2018 Xaymar
+
+	Permission is hereby granted, free of charge, to any person obtaining a copy
+	of this software and associated documentation files (the "Software"), to deal
+	in the Software without restriction, including without limitation the rights
+	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+	copies of the Software, and to permit persons to whom the Software is
+	furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included in all
+	copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+	SOFTWARE.
+--]]
+
+--[[
+
+# Class UIManager
+UIManager is used to simplify the logic required to keep the GameMode's UI looking
+ good by simply moving all the logic into a single class and then handing off 
+ the UI control to the windows themselves.
+
+# Events
+Events must be explicitly listened to by the client object. A client must first call
+	UIManager:Listen(string event, any uniqueId, function callback)
+to listen to an event and call
+	UIManager:Silence(string event, any uniqueId)
+to stop listening to an event.
+
+## UpdateDPI(float DPIPercent)
+Called whenever a change is made to the DPI, such as a change in the screen resolution,
+ or an update from the user of this class. Only parameter is DPI, which is a float.
+1.0 designates 100%, 2.0 designates 200% and so on.
+
+--]]
+
+local UIManagerMeta = {}
+UIManagerMeta.__index = UIManagerMeta
+
+-- Global Constructor
+function UIManager()
+	local obj = {}
+	obj.__index = obj
+	setmetatable(obj, UIManagerMeta)
+	obj:__construct()
+	return obj
+end
+
+-- Constructor
+function UIManagerMeta:__construct()
+	self:InitializeEvents()
+	self:UpdateScreen()
+	self:InitializeDPI()
+end
+
+-- Events
+function UIManagerMeta:InitializeEvents()
+	self.events = {}
+end
+
+function UIManagerMeta:Listen(event, uniqueName, callback)
+	assert(type(event) == "string", "UIManager:Listen(event<string>, callback<function>): event must be a string")
+	assert(type(callback) == "function", "UIManager:Listen(event<string>, callback<function>): callback must be a function")
+	
+	if (self.events[event] == nil) then
+		self.events[event] = {}
+	end
+
+	self.events[event][uniqueName] = callback
+	return true
+end
+
+function UIManagerMeta:Silence(event, uniqueName)
+	if (self.events[event] == nil) then
+		return false
+	end
+	
+	if (self.events[event][uniqueName] == nil) then
+		return false
+	end
+	
+	self.events[event][uniqueName] = nil
+	return true
+end
+
+function UIManagerMeta:Call(event, ...)
+	if (self.events[event] == nil) then
+		return
+	end
+	
+	for k,v in pairs(self.events[event]) do
+		print(k)
+		print(v)
+		v(...)
+	end
+end
+
+-- Screen
+function UIManagerMeta:UpdateScreen()
+	if (self.screen == nil) then
+		self.screen = {}
+	end
+	if ((self.screen.width != ScrW()) || (self.screen.height != ScrH())) then
+		self.screen.width = ScrW()
+		self.screen.height = ScrH()
+		return true
+	end
+	return false
+end
+
+-- Tick
+function UIManagerMeta:Tick()
+	if (self:UpdateScreen() == true) then
+		self.dpi.calculated = self:CalculateDPI()
+		if (self.dpi.override == nil) then
+			self:Call("UpdateDPI", self.dpi.calculated)
+		else
+			self:Call("UpdateDPI", self.dpi.override)
+		end
+	end
+end
+
+-- DPI Scaling
+function UIManagerMeta:InitializeDPI()
+	self.dpi = {}
+	-- Calculate DPI using these base sizes.
+	self.dpi.base = {}
+	self.dpi.base.width = 1280
+	self.dpi.base.height = 720
+	-- Limits
+	self.dpi.limits = {}
+	self.dpi.limits.min = 25
+	self.dpi.limits.max = 400
+	-- Final Value
+	self.dpi.override = nil
+	self.dpi.calculated = self:CalculateDPI()
+end
+
+function UIManagerMeta:CalculateDPI()
+	--[[
+	DPI Scaling is linear in respect to the base resolution.
+	That means that at 50% of the Base resolution, the output is 0.5,
+	 and at 200% of the Base resolution, the output is 2.0.
+	--]]
+	
+	-- Shortest Edge scaling
+	local wScale, hScale = self.screen.width / self.dpi.base.width, self.screen.height / self.dpi.base.height
+	
+	if (wScale < hScale) then
+		return wScale
+	end
+	return hScale
+end
+
+function UIManagerMeta:GetDPIScale()
+	if (self.dpi.override != nil) then
+		return self.dpi.override
+	end
+	return self.dpi.calculated
+end
+
+function UIManagerMeta:SetDPIScale(newDPIScale)
+	if (newDPIScale == nil) then
+		self.dpi.override = nil
+		self:Call("UpdateDPI", self.dpi.calculated)
+	else
+		self.dpi.override = newDPIScale
+		if (self.dpi.override < self.dpi.limits.min) then
+			self.dpi.override = self.dpi.limits.min
+		end
+		if (self.dpi.override > self.dpi.limits.max) then
+			self.dpi.override = self.dpi.limits.max
+		end
+		self:Call("UpdateDPI", self.dpi.override)
+	end
+end
+
+