Drag & Drop to the Tag browser can go awry

[ChrisMillward]

Unlike most browser drag & drop operations Calibre adds a 'Boundary Box' to the blue, colour highlight ( a rather pale colour at that ). On releasing the selected book(s), if either the top or bottom line of the rectangular box is missing this will cause one of two things to happen.

With Tags, the drop simply doesn't happen.

With a Hierarchical Tags, the drop will go to the parent Tag instead.
For example;

Subjects
      Archaeology
      Astronomy
            Astrobiolgy
            Astrochemistry
            Astrophysics
      Aviation

If Astronomy.Astrophysics is the target tag and the rectangle is not fully present then the drop goes to 'Astronomy'.
If 'Astronomy' is itself used as a tag the good luck finding the errors among the other books tagged.
If 'Astronomy' is not used as a tag then the errors can be spotted once you know what happens and corrected.

The rectangle requires great accuracy for correct selection and it therefore slows dropping right down, unlike other systems where positioning anywhere in the highlighted area is OK.

Obviously if the Tag/Subject column is visible the result (or not) can be confirmed but again this slows the process down and that is if you remember to look.

This should be easy, quick and accurate.

[ChrisMillward]

Sorry the spaces indenting Astronomy, Astrobiology,Astrophysics have been stripped out

[kovidgoyal]

That is because you can drop either on an item or between items, to add to the parent. And while dropping between items is indeed fiddly, dropping on an item is perfectly quick, since you can drop anywhere on the item.

[ChrisMillward]

I see what you are saying but there is no real 'in between' because the item above or below remains highlighted and that is where the book is reasonably expected to go. The 'in between' indication doesn't become just a simple (thin) line on which to drop a book. The highlight should disappear when 'in between' is selected to avoid confusion. It's a visual thing, you can drop your book as soon as the highlight appears, almost without looking - except you can't, you have to look closely.

This is because the effective area of the blue box is reduced significantly. If the item is highlighted and my cursor is visibly INSIDE the highlight then that is where I expect it to go.

I am not sure why anybody would choose 'in between' to add a book to the parent folder.

[ChrisMillward]

Another thought, since the the highlighted tag should be the destination for the drop then 'in between' should highlight the parent as the actual destination.

[kovidgoyal]

You'll have to argue with the Qt developers, Im afraid re-implementing a tree widget is a little too much work for me.

[ChrisMillward]

How do you do that? Are they likely to see this post and make improvements?

[kovidgoyal]

https://bugreports.qt.io

[ChrisMillward]

Thank you