Resolved Shift-Clicking a Button

Hey all. I've got a bunch of buttons that I'd like to do something when I shift-click on them, but I can't seem to figure out how. If I hold down shift (or control or alt) and click on a UI Button nothing happens. The button.clicked function doesn't seem to trigger at all.

Any ideas?

 

Update: Okay, managed to make it work, but it seems like kind of a weird fix. I have to use button.clicked to register just clicking on the button, but I have to use a RegisterCallBack<MouseDownEvent> to capture a shift-click. The code button.clicked won't work on modifier-clicking, and using a callback won't work for regular clicking. Here's the code:

Code (CSharp):

1. button.clicked += () => ButtonPressed();
2. button.RegisterCallback<MouseDownEvent>(evt => ButtonPressed());

So both methods call the same function and I have an If-Else check inside that function to check if a modifier key is being held down .

How strange that two different pieces of codes are required for the two different clicks.

 

Update 2: Ah, I figured out what's going on. The Button UI Element has a ManipulatorActivationFilter property that can be edited to add more functions and modifiers. So to add the ability to control, shift, or alt-click, use the following code:

Code (CSharp):

1. Button button = new Button();
2. button.clickable.activators.Add(new ManipulatorActivationFilter { button = UnityEngine.UIElements.MouseButton.LeftMouse, modifiers = EventModifiers.Shift });
3. button.clickable.activators.Add(new ManipulatorActivationFilter { button = UnityEngine.UIElements.MouseButton.LeftMouse, modifiers = EventModifiers.Alt });
4. button.clickable.activators.Add(new ManipulatorActivationFilter { button = UnityEngine.UIElements.MouseButton.LeftMouse, modifiers = EventModifiers.Control });

Reference the API for Buttons here: https://docs.unity3d.com/ScriptReference/UIElements.Button.html
Link to the ManipulatorActivationFilter is near the beginning of that page.

 

Hey, do you have any pointers for how to detect which modifier was used in code?
I'm getting confused between UnityEngine.UI and UnityEngine.UIElements.

(This is the top result for me in google and I'm struggling to find an answer to how to add modifier keys for clicking Unity UI elements. The other way I found is detect modifier keys separately... not sure I want to do that though?)

Thanks!

EDIT: I think I'm confusing Unity's UI system with the newer Unity UI Toolkit...

 

Sorry for the late reply.
I'm not sure what you mean when you ask about detecting which modifier was used in code.
If you're just trying to add modifiers, it should be as simple as my example in post #3.

Yes, it's all a bit confusing unfortunately. Unity currently has 3 different UI systems to choose from; UI Toolkit, The Unity UI package (GUI), and IMGUI. The first is the newest, and UIElements goes with the UI Toolkit I believe.