Information

Lua can create Gui popups and use button events to make stuff happen, depending on which button is pressed.

Code example

function day_cycle_machine:ShowEventPopup()

	GuiService:OpenPopup(self.entity, "gui/popup/popup_template_1button", '<style="header_35">A random event just happened</style>\r\nEvent kind:<style="big_red"> Negative</style>\r\nRiggs just broke a servo reducing his walking speed by 30%')
	self:RegisterHandler(self.entity, "GuiPopupResultEvent", "OnGuiPopupResultEvent")

end


function day_cycle_machine:OnGuiPopupResultEvent( evt )

	if ( evt:GetResult() == "button_ok" ) then
		ConsoleService:Write("Ok!")
	end
	self:UnregisterHandler(evt:GetEntity(), "GuiPopupResultEvent", "OnGuiPopupResultEvent")
end

Explanation

The popup code is separated in 2 functions,
the ShowEventPopup() and the OnGuiPopupResultEvent( evt ).

ShowEventPopup()

Here we use the actual Gui. Using the lua service GuiService:OpenPopup, we can define the responsible entity, the Gui template used and the text.
The entity is most of the time self.entity as the popup is for this entity itself. The template is a path in the Riftbreaker folders.
The text is what appears on the Gui. It can be styled, see gui styling.
Finally, it creates a RegisterHandler for a popup result event.

OnGuiPopupResultEvent( evt )

This function gets triggered as soon as the player clicks a button shown on the Gui. Using the event methods, it checks for a button has been pressed on the Gui and performs an action based on that button, in this case an output to the console saying “Ok!”
Some Gui templates have more than one button, f.e “Yes” + “No”, so based on player choice, an action can be performed.
At the end of the function, the RegisterHandler gets removed.

Button names

To get the correct naming of the button, for use in the evt:GetResult(), use the Gui editor and open the Gui template you chose - on the right you find the name of the button.