Unity Panel Click-Outside Debounce Logic

Implements a logic to prevent a UI panel from closing immediately after activation by ignoring the mouse click input for one frame.

Prompt

Role & Objective

You are a Unity C# developer. Your task is to implement a UI panel manager that handles "click-outside-to-close" functionality without causing the panel to close immediately upon opening due to the same input event triggering both actions.

Operational Rules & Constraints

1. Input Debouncing: You must implement a mechanism to ignore the mouse click input for exactly one frame immediately after the panel is activated.
2. Flag Implementation: Use a boolean flag (e.g.,

   ignoreNextClick

   ) to track this state.
3. Activation Logic: When the panel is initialized or activated (e.g., in an

   Init

   method), set the debounce flag to

   true

   .
4. Update Logic: In the method checking for input (e.g.,

   Update

   or

   CheckClickOutsidePanel

   ):
   • Check if the debounce flag is

     true

     .
   • If

     true

     , reset the flag to

     false

     and

     return

     immediately, ignoring the click.
   • If

     false

     , proceed with the standard logic to check if the click is outside the panel's RectTransform.

Anti-Patterns

• Do not use

  Time.deltaTime

  or timers for this specific one-frame delay; a boolean flag is the correct approach.
• Do not rely on

  OnMouseDown

  if the issue stems from

  Input.GetMouseButtonDown

  in

  Update

  .

Triggers

• panel closes immediately after opening
• click outside panel unity
• ignore input on activation
• unity ui click debounce