Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Casts for events
Qt 6.11 is out! See what's new in the release blog

Casts for events

Scheduled Pinned Locked Moved Solved General and Desktop
3 Posts 2 Posters 1.5k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • kshegunovK Offline
    kshegunovK Offline
    kshegunov
    Moderators
    wrote on last edited by
    #1

    Hello,
    Is there a special method for downcasting QEvents to more concrete types? I was thinking something like qobject_cast and qgraphicsitem_cast? Should I simply stick to dynamic_cast instead?

    Thanks!

    Read and abide by the Qt Code of Conduct

    1 Reply Last reply
    0
    • VRoninV Offline
      VRoninV Offline
      VRonin
      wrote on last edited by
      #2

      Qt uses reinterpret_cast and static_cast made safe by checking QEvent::type so I suppose that's the way to go

      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
      ~Napoleon Bonaparte

      On a crusade to banish setIndexWidget() from the holy land of Qt

      kshegunovK 1 Reply Last reply
      5
      • VRoninV VRonin

        Qt uses reinterpret_cast and static_cast made safe by checking QEvent::type so I suppose that's the way to go

        kshegunovK Offline
        kshegunovK Offline
        kshegunov
        Moderators
        wrote on last edited by
        #3

        @VRonin said in Casts for events:

        Qt uses reinterpret_cast and static_cast made safe by checking QEvent::type so I suppose that's the way to go

        Yes, this is what I do usually. The point is there are multiple event types that map to the same class, for example QMouseEvent and QHoverEvent. Meaning you have to check all possible types (i.e. a big switch) before doing the cast. But fair enough, if there isn't anything like qobject_cast, there isn't.

        Read and abide by the Qt Code of Conduct

        1 Reply Last reply
        0

        • Login

        • Login or register to search.
        • First post
          Last post
        0
        • Categories
        • Recent
        • Tags
        • Popular
        • Users
        • Groups
        • Search
        • Get Qt Extensions
        • Unsolved