dx-Klasse | W.I.P

dxElements = {
	available = {
		["window"] = true,
		["gridlist"] = true,
		["button"] = true,
		["edit"] = true,
		["text"] = true
	}
}


local validKeys = {
	'a',
	'b',
	'c',
	'd',
	'e',
	'f',
	'g',
	'h',
	'i',
	'j',
	'l',
	'k',
	'm',
	'n',
	'o',
	'p',
	'q',
	'r',
	's',
	't',
	'u',
	'v',
	'w',
	'x',
	'y',
	'z',
	'backspace',
	'space',
	'lshift',
	'-',
	'.',
	',',
	'0',
	'1',
	'2',
	'3',
	'4',
	'5',
	'6',
	'7',
	'8',
	'9',
	'<'
}


local specialKeys = {
	["q"] = "@"
}




setmetatable(dxElements, {
	__call = function(_, properties)
		if dxElements.available[properties[1]] == true then
			local element = setmetatable({
				typ = properties[1],
				x = properties[2],
				y = properties[3],
				w = properties[4],
				h = properties[5],
				text = properties[6],
				bgColor = properties[7] or {255, 255, 255, 255},
				buttonColor = properties[8] or {255, 255, 255, 255},
				textColor = properties[9] or {255, 255, 255, 255},
				postGUI = properties[10] or false,
				buttonFunction = properties[11],
				visible = false,
				textScale = 1,
				textFont = "default"
			}, {__index = dxElements})
			element.renderFunc = function() element:render() end
			element.clickFunc = function(button, state) element:onClick(button, state) end
			element.charFunc = function(c, press) element:onChar(c, press) end
			addEventHandler("onClientRender", getRootElement(), element.renderFunc)
			addEventHandler("onClientClick", getRootElement(), element.clickFunc)
			addEventHandler("onClientKey", getRootElement(), element.charFunc)
			print(("[dxElements] New %s has been registered."):format(element.typ))
			return element
		end
		return print("false")
	end
})


function dxElements:unregister()
	removeEventHandler("onClientRender", getRootElement(), self.renderFunc)
	removeEventHandler("onClientClick", getRootElement(), self.clickFunc)
	removeEventHandler("onClientKey", getRootElement(), self.charFunc)
	self = nil
end


function dxElements:render()
	if self.visible == true then
		if self.typ == "window" then
			local textpart_h = dxGetFontHeight(1.3, "default-bold")
			local r, g, b, a = unpack(self.bgColor)
			dxDrawRectangle(self.x, self.y, self.w, self.h, tocolor(r, g, b, a), self.postGUI) -- window background
			dxDrawRectangle(self.x, self.y, self.w, textpart_h, tocolor(r+20, g+20, b+20, a), self.postGUI) -- topic(rectangle)
			dxDrawText(self.text, self.x+self.w/2-(dxGetTextWidth(self.text, 1.3, "default-bold")/2), self.y, self.w, textpart_h, tocolor(unpack(self.textColor)), 1.3, "default-bold", "left", "top", false, false, self.postGUI, true) -- topic(text)
		elseif self.typ == "gridlist" then

		elseif self.typ == "button" then
			local r, g, b, a = unpack(self.buttonColor)
			if isMouseOverElement(self.x, self.y, self.w, self.h) then
				dxDrawRectangle(self.x, self.y, self.w, self.h, tocolor(r+20, g+20, b+20, a), self.postGUI)
			else
				dxDrawRectangle(self.x, self.y, self.w, self.h, tocolor(r, g, b, a), self.postGUI)
			end
			local textpart_h = dxGetFontHeight(1, "default-bold")
			dxDrawText(self.text, self.x+self.w/2-(dxGetTextWidth(self.text, 1, "default-bold")/2), self.y+(textpart_h/2), self.w, textpart_h, tocolor(unpack(self.textColor)), 1, "default-bold", "left", "top", false, false, self.postGUI, true) -- topic(text)
		elseif self.typ == "edit" then
			dxDrawRectangle(self.x, self.y, self.x, self.h, tocolor(unpack(self.bgColor)), self.postGUI) -- edit background
			dxDrawText(self.text, self.x, self.y+(self.h/2), self.x, self.h, tocolor(unpack(self.textColor)), 1, "default-bold", "left", "top", false, true, self.postGUI)
		elseif self.typ == "text" then
			dxDrawText(self.text, self.x, self.y, self.w, self.h, tocolor(unpack(self.textColor)), self.textScale, self.textFont, "left", "top", false, false, self.postGUI)
		end
	end
end


function dxElements:onClick(button, state)
	if state == "up" or button == "right" then return end
	if self.typ == "window" then
		return true
	elseif self.typ == "gridlist" then
		-- TODO
	elseif self.typ == "button" then
		if isMouseOverElement(self.x, self.y, self.w, self.h) then
			return self.buttonFunction() and true or false
		end
	elseif self.typ == "edit" then
		if isMouseOverElement(self.x, self.y, self.w, self.h) then
			self.active = true
		else
			self.active = false
		end
	end
end


function dxElements:isValidKey (char)
	for _, key in ipairs(validKeys) do
		if key:lower() == char:lower() then
			return true
		end
	end
	return false
end


function dxElements:onChar(c, p)
	if self.active == true then
		if p then
			if c == "lshift" then
				self.shift = true
				return
			elseif c == "ralt" then
				self.ralt = true
				return
			end
			if dxElements:isValidKey(c) and (not isChatBoxInputActive()) and (not isConsoleActive()) and (not isMainMenuActive()) then
				if c == "space" then
					self.text = self.text.." "
				elseif c == "backspace" then
					self.text = string.sub(self.text, 1, #self.text-1)
				elseif self.ralt then
					self.text = self.text..specialKeys[c:lower()]
				else
					if self.shift then c = c:upper() end
					self.text = self.text..c
				end
			end
		else
			if c == "lshift" then
				self.shift = false
				return
			elseif c == "ralt" then
				self.ralt = false
				return
			end
		end
	end
end


function dxElements:toggleVisibility()
	self.visible = not self.visible
end


function dxElements:textSetScale(int)
	self.textScale = int
end




function dxElements:textSetFont(font)
	self.textFont = font
end


function isMouseOverElement(psx,psy,pssx,pssy)
	if isCursorShowing() == false then
		return false
	end
	local x,y = guiGetScreenSize()
	local cx,cy = getCursorPosition()
	cx,cy = cx*x,cy*y
	if cx >= psx and cx <= psx+pssx and cy >= psy and cy <= psy+pssy then
		return true,cx,cy
	else
		return false
	end
end