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coding-conventions.md

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Implementation notes for <bx-tabs>

Relationship with the narrow mode with <bx-dropdown>

<bx-tabs> contains lots of code originated from <bx-dropdown>, to support its narrow screen UI. Moving such code to a mixin to share the code between those two components is in consideration, but not happening for now, from the following reasons:

  • <bx-dropdown> code has lots of portions to support its derived class (<bx-combo-box> and <bx-multi-select>) that <bx-tabs> doesn't need
  • <bx-dropdown> allows programmatic control of its open state, whereas <bx-tabs> doesn't (saw less need to support that feature)
  • <bx-tabs> code has several portions to seamlessly switch between narrow mode and wide mode, that caused difference in markup from <bx-dropdown>

Keyboard navigation model

<bx-tabs> uses the same keyboard navigation model (virtual focus) as <bx-dropdown>, due to the following reasons:

  • To align narrow mode's user interaction model to <bx-dropdown>
  • To avoid scenarios like:
    1. User focuses on 2nd tab
    2. User shrinks the screen size
    3. The dropdown body, where the focused 2nd tab is, is hidden

Tab styles in wide mode with different states

Note: Arrow keys in wide mode changes selection, whereas arrow keys in narrow mode requires space/enter to select an item. And thus no highlighted state.

Normal Hover Focus
Normal Light text ($text-02), light gray thick underline ($ui-03) Light text ($text-02), dark gray thick underline ($ui-04) (Focused means selected)
Disabled Ultra-light text ($disabled-01), ultra-light gray thick underline ($disabled-02) (No reaction to hover) (No reaction to focus)
Selected Blue thick underline ($interactive-01/$focus), dark bold text (No reaction to hover) Blue outline ($interactive-01/$focus), dark bold text