how do something on a window before the user open that window?

[A Former User]

@6thC forget about disabling some parts
what i did in the photo runs just one time
which mean if i open this window it will execute doAll()
but if i closed the window and open it again it will not execute doAll()
i will have to exit the whole application to execute it again
what i want is that every time the user open this window it will execute doAll()
did you understand me ?

[6thC]

I understand you - do you understand me. You've proven it works in the constructor right? So now you just need to call this method again but not at construction time, during another stage of it's life. You currently only have it wired/hooked into object creation time - where you are is the constructor and that only happens when an class is instantiated as an object.

So. close and open ... probably aren't doing Destruct and Construct. They may be reusing your object and just changing objects states.

You could:

• call the method again - hooked into the events that you care about
• use a new editUsers object

I don't think you will need to close your whole application at all, that's just crazy. There will be a focus event or something to use, did you go to the link in the last?

[A Former User]

@6thC yes i understand you,
but the problem is there is no events related with the window opening
and doAll() must execute in the window opening before any thing else
i think that qt have it own methods on opening the windows or showing it

[6thC]

did you go to http://doc.qt.io/qt-5/qwidget.html#visible-prop ?

"See also show(), hide(), isHidden(), isVisibleTo(), isMinimized(), showEvent(), and hideEvent()."

There's a number of events that may be suitable. I cannot tell from just this definition - could you just use a fresh editUsers instance? I'm sure there's a way to hook this.

What about http://doc.qt.io/qt-5/qdialog.html#showEvent

[A Former User]

@6thC thank a lot,

it worked

[JonB]

@davidlabib
You will have read http://doc.qt.io/qt-5/qwidget.html#showEvent & http://doc.qt.io/qt-5/qshowevent.html by now I presume. So just checking you are happy that your doAll(false); will be executed when, say, the window is minimized and then restored? Not just when the user shows the window. So, for example, if your doAll(false) resets widget visibility you will get that on minimize + restore too.

[A Former User]

@JonB 1. I don't understand you , please explain

[JonB]

@davidlabib
I have explained in the clearest language possible, I cannot think of another way to phrase it.

[A Former User]

@JonB do you say that in this way if the user minimized the window and then restored it
it will execute doAll(false) or the reverse ?

[JonB]

@davidlabib
I wrote:

So just checking you are happy that your doAll(false); will be executed when, say, the window is minimized and then restored?

How can I explain that more clearly? If the user minimizes your window and then restores it (makes it visible again) showEvent() will be called. And as you have written it that means it will call your doAll(false). Why don't you try it on minimizing and then restoring your window?

I don't know what your doAll(false) does. Maybe it wants to do that, maybe it does not.

[A Former User]

@JonB now I understand you ,
I'm sorry for stupidity ,but english is not my tongue
I'm using dialog not Mainwondow that's why i didn't try to minimizing and then restoring the window

[JonB]

@davidlabib
I realise about the English, not a problem, I just did not know how to phrase it any better.

Just check: when the dialog is up, got to your desktop's toolbar (or whatever) and see if you can minimize/restore from there (e.g. Windows allows click on toolbar icon to toggle minimize/restore). If it lets you do that while dialog is showing, see whether your showEvent() in the dialog gets called? If not, you are probably good to go.

[A Former User]

@JonB you are right
when i minimize and restore it execute doAll(false)
is there is another event work when the window opens but not sensitive about minimizing and restoring?

[mrjj]

@davidlabib
Hi
Do it in constructor as you show - should call it only once and
then not again on show /minimize etc.
But normally you create a Dialog show it and delete it
so constructor is called every time and hence it should be exactly like u want.

So please show the code where you pop up the editUser Dialog.

[JonB]

@davidlabib
We can look into the minimize/restore if we need to. However for now you should answer @mrjj's comment. Why are you re-showing the dialog? Are you keeping it in existence permanently and hiding/showing it (in which case, why?), or do you destroy and re-create it, in which case you could do your code in constructor instead?

[A Former User]

@mrjj @JonB
this is my dialog

this is doAll()

it suppose to execute doall(true) when admin password is right .OK?
so doAll must be false when the window shows
so the user will be have to fill admin password

[JonB]

@davidlabib
I think you're saying you want all the other other widgets to be enabled/disabled depending on whether Admin Password has or has not been filled in correctly? Or according as it has something/nothing already in it?

If that is the case you will want to disable/enable as user types into Admin Password? So you will also want to call this during input to that widget? Do you also (sometimes) put something into Admin Password when you display the dialog?

All in all, why do you only seem to want to call doAll() when window is shown? And you need to answer @mrjj's question: Yes, we can see your dialog, but that does not tell us whether you keep it in existence after showing it or whether you destroy it and construct from scratch?

I'll give you one tip. I have code which must only be executed the first time a window/dialog is shown, not before then (construction time is too early) and not after then. So my code for showEvent() is like (I don't use C++):

classMemberVarialbeFirstShown = false;

showEvent()
{
    if not classMemberVarialbeFirstShown
        doFirstImeStuff();
    classMemberVarialbeFirstShown = true;
}

[A Former User]

@mrjj no , i don't have to keep it in existence
i don't mind destroying and re-creating it

[mrjj]

@davidlabib
Ok so im not sure what its not working for you
If you call doAll(false) in constructor
then when Dialog is shown they should all be disabled.
Is that not the case?

[JonB]

@davidlabib
Then you could follow @mrjj's advice to just do your work in the constructor and not worry about show events.

But you really need to explain precisely when you want those widgets to change between enabled & disabled, because I for one don't know what you intend.