Emitted when the mouse has paused over the item for a certain amount of time, or the tooltip was requested via the keyboard.
Note that if keyboard_mode is true, the values of x and y are
undefined and should not be used.
If the item wants to display a tooltip it should update tooltip and return true.
| x |
the x coordinate of the mouse. |
| y |
the y coordinate of the mouse. |
| tooltip |
a Tooltip. |
| keyboard_mode |
true if the tooltip was triggered using the keyboard. |
|
true if the item has set a tooltip to show. |