Add manual button's layout manager

[mks-h]

The problem is predefined layouts don't provide all possible options. I think predefined layouts should be "Windows", "MacOS", "Ubuntu", "Reversed", and one more super-popular layout. And everything else should be constructed manually through some layout manager.

[ryonakano]

Yeah I've been thinking the current design (combobox) is not visually good. Maybe throw that design out and use DnD instead?

[ryonakano]

Just a small mockup (not fully working tho):

Peek.2021-09-27.21-39.mp4

[sempasha]

Let's imagine each button position is marked with number

[ 1 2 3  window title 4 5 6 ]

When we have only three possible buttons (close ⨯, maximize ⤢ and minimize ⤓), there are only nine positional combinations for buttons placement

[ 1      window title        ]
[        window title      6 ]
[ 1 2    window title        ]
[ 1      window title      6 ]
[        window title    5 6 ]
[ 1 2 3  window title        ]
[ 1 2    window title      6 ]
[ 1      window title    5 6 ]
[        window title  4 5 6 ]

Combinations with spaces between buttons, or with spaces between button and titlebar edge aren't useful, e.g. layout below seems to be too odd. It has nothing at position 2 (between 1 and 3) and nothing at position 6 (between 5 and right edge)

[ 1   3  window title    5   ]

Let's assume close ⨯ button is required for any layout, and it must be placed at the titlebar edge (position 1 or 6).

Then we have:

1. 2 layouts for single button:

   [ ⨯      window title        ]  # Close Only Left
   [        window title      ⨯ ]  # Close Only Right
   

2. 8 layouts for two buttons:

   [ ⨯ ⤢    window title        ]
   [ ⨯      window title      ⤢ ]  # Elementary
   [ ⤢      window title      ⨯ ]  # Elementary Reversed
   [        window title    ⤢ ⨯ ]
   [ ⨯ ⤓    window title        ]
   [ ⨯      window title      ⤓ ]  # Replace Maximize to Minimize
   [ ⤓      window title      ⨯ ] 
   [        window title    ⤓ ⨯ ]
   

3. 12 layouts for three buttons:

   [ ⨯ ⤢ ⤓  window title        ]  # Ubuntu
   [ ⨯ ⤓ ⤢  window title        ]  # MacOS
   [ ⨯ ⤢    window title      ⤓ ]
   [ ⨯ ⤓    window title      ⤢ ]  # Add Minimize Left
   [ ⨯      window title    ⤢ ⤓ ]
   [ ⨯      window title    ⤓ ⤢ ]  # Add Minimize Right
   [ ⤓ ⤢    window title      ⨯ ]
   [ ⤢ ⤓    window title      ⨯ ]
   [ ⤓      window title    ⤢ ⨯ ]
   [ ⤢      window title    ⤓ ⨯ ]
   [        window title  ⤓ ⤢ ⨯ ]  # Windows
   [        window title  ⤢ ⤓ ⨯ ]
   

There are 22 possible layouts in total.
Seems like selecting target layout from options still possible.