[Interest] Qml SpinBox Control 2 undo/redo

[Furkan Uzumcu]

Not very sophisticated but something like the following might work for you:

    1         SpinBox {
    2             id: spin
    3
    4             property var history: []
    5             property bool _internalUpdate: false
    6
    7             from: 0
    8             to: 100
    9             onValueChanged: {
   10                 if (!spin._internalUpdate) {
   11                     spin.history.push(value)
   12                 }
   13             }
   14             Component.onCompleted: {
   15                 spin.history.push(value)
   16             }
   17         }
   18
   19         Button {
   20             text: <="" span="">
   21             onClicked: {
   22                 if (spin.history.length > 0) {
   23                     spin._internalUpdate = true
   24                     spin.value = spin.history[
   25                         Math.max(0, spin.history.length - 2)
   26                     ]
   27                     spin._internalUpdate = false
   28                     if (spin.history.length > 1) {
   29                         spin.history.splice(spin.history.length - 1, 1)
   30                     }
   31                 }
   32             }

Regards,
Furkan Üzümcü
On Mar 17, 2020, 16:26 -0400, Jérôme Godbout <godboutj at amotus.ca>, wrote:
> Hi,
> I’m trying to make an undo redo, I manage to have my whole thing working for user mouse drag n drop, add remove part into my model. One thing that bug me with the control 2 is the spinbox, the value is bind to the mode and the model get changed too, not sure this is the optimal way (I so wish we got 2 way binding like C# one day, this is so deeply needed and not have everybody reimplement there own way).
>
> SpinBox
> {
>     id: sequenceIndex_
>
>     value: opsModel.index
>
>     onValueChanged:
>     {
>         // This is called before value modified
>     }
>
>     onValueModified:
>     {
>         // The value is already modified, how can I get previous value to make my undo/redo ? seem too late and the value changed as already been called
>     }
>
>     Binding
>     {
>         target: ops_model
>         property: "index"
>         value: sequenceIndex_.value
>     }
> }
>
> How does one manage to do it with this control?! I guess I will have the same challenge with the ComboBox and all the selector controls (button are fairly easy since I can capture the previous value before doing the action).
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> https://lists.qt-project.org/listinfo/interest
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20200318/b294e3bf/attachment.html>