QT's Qabstractitemview Right-click menu

I. Overview of functions

Speaking of the right-click menu, before Qt's custom Qlineedit right-click menu This article I have described the implementation of 3 kinds of right-click menu, today is also in a wordy, for the Qlistwidget class in the Custom right-click menu, I use the specific way, is to directly rewrite the Contextmenuevent method, which pops up the right-click menu in this method.

Second, the effect shows

1 is the right-click menu for Qlistwidget customization, the general aesthetic level, but the basic realization of the function

Figure 1 Qlistwidget Right-click menu

Third, the code explanation

Right-click menu in the related articles section I have given some articles, on the right-click menu pop-up logic I do not elaborate, here I will simply say right-click menu processing Code

ListItem is a custom item item that uses the Setitemwidget interface to set the window to the Qstandardlistwidgetitem item

1, delete, first get the current item, and then get the window on the current item, and the destructor

1 voiddraglist::D eletesotck ()2 {3Qlistwidgetitem * item =CurrentItem ();4     if(Item = =nullptr)5     {6         return;7     }8     9     if(ListItem * Itemwidget =Itemwidget (item))Ten     { OneItemwidget->Deletelater (); AItemwidget =nullptr; -     } -      the     Deleteitem; -item =nullptr; -}

2, top, this operation needs to be noted, if the current item is already the first, then do not need to do any processing

1 voidDraglist::topsotck ()2 {3Qlistwidgetitem * item =CurrentItem ();4     if(Item = =nullptr)5     {6         return;7     }8 9     if(Row (item) = =0)Ten     { One         return; A     } -  -ListItem * Itemwidget =itemwidget (item); theQlistwidgetitem * NewItem =Takeitem (Row (item)); -InsertItem (0, newitem); -ListItem * Topwidget =NewListItem; -Topwidget->setdata (itemwidget->GetData ()); + Setitemwidget (NewItem, topwidget); -  +     if(Itemwidget) A     { at         DeleteItemwidget; -Itemwidget =nullptr; -     } - Setcurrentitem (newitem); -}

3, low, the same truth, if the current item is the last one, then do not need to do processing

1 voidDraglist::bottomsotck ()2 {3Qlistwidgetitem * item =CurrentItem ();4     if(Item = =nullptr)5     {6         return;7     }8 9     if(Row (item) = = COUNT ()-1)Ten     { One         return; A     } -  -ListItem * Itemwidget =itemwidget (item); theQlistwidgetitem * NewItem =Takeitem (Row (item)); - AddItem (newitem); -ListItem * Bottomwidget =NewListItem; -Bottomwidget->setdata (itemwidget->GetData ()); + Setitemwidget (NewItem, bottomwidget); -  +     if(Itemwidget) A     { at         DeleteItemwidget; -Itemwidget =nullptr; -     } - Setcurrentitem (newitem); -}

4. Move up one

1 voidDraglist::upsotck ()2 {3Qlistwidgetitem * item =CurrentItem ();4     if(Item = =nullptr)5     {6         return;7     }8 9     intItemrow =row (item);Ten     if(Itemrow = =0) One     { A         return; -     } -  theListItem * Itemwidget =itemwidget (item); -Qlistwidgetitem * NewItem =Takeitem (Row (item)); -InsertItem (Itemrow-1, newitem); -ListItem * Upwidget =NewListItem; +Upwidget->setdata (itemwidget->GetData ()); - Setitemwidget (NewItem, upwidget); +  A     if(Itemwidget) at     { -         DeleteItemwidget; -Itemwidget =nullptr; -     } -  - Setcurrentitem (newitem); in}

5. Move down one

1 voiddraglist::D ownsotck ()2 {3Qlistwidgetitem * item =CurrentItem ();4     if(Item = =nullptr)5     {6         return;7     }8 9     intItemrow =row (item);Ten     if(Itemrow = = count ()-1) One     { A         return; -     } -  theListItem * Itemwidget =itemwidget (item); -Qlistwidgetitem * NewItem =Takeitem (Row (item)); -InsertItem (Itemrow +1, newitem); -ListItem * Downwidget =NewListItem; +Downwidget->setdata (itemwidget->GetData ()); - Setitemwidget (NewItem, downwidget); +  A     if(Itemwidget) at     { -         DeleteItemwidget; -Itemwidget =nullptr; -     } - Setcurrentitem (newitem); -}

Iv. Sample Code

QT Qabstractitemview View Right-click menu

V. RELATED articles

QT's Custom Qlineedit right-click menu

QT Menu item Customization

Qt Pop-up menu shadow

QT's default menu language setting

QT's Qabstractitemview Right-click menu