[SOLVED: Thanks Jacek] setParent on object just makes it disapear.

[hickscorp]

Hello people,

i'm new to this forum, i don't know how much active it is.
So let me explain what i'm doing first:
- I want to achieve a very simple text editor (Tab based) like GEdit is.
- I want it to be light (Because it is part of a much bigger project i have).

So for this
- In the first tab i have a QTextEdit item.
- i have created a simple QT Window, with in it a tabContainer.
- In this tab container, i have created two test tabs (tabFile_New1 and tabFile_New2).
- The signal fom the tab container: currentChanged(QWidget*) is handled in my main Window code, and it pretty much does something like this:

void CWndMainImpl::EditorTabChanged (QWidget* pWidget) {
	QTabWidget* pSelectedTab	= (QTabWidget*)pWidget;
	pTextViewer->setParent(pSelectedTab);
}

void CWndMainImpl::EditorTabChanged (QWidget* pWidget) {
	QTabWidget* pSelectedTab	= (QTabWidget*)pWidget;
	pTextViewer->setParent(pSelectedTab);
}

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So as you understood, the goal is to only have one single text edit box which travels from one tab to another, just changing it's content in a transparent way to the end user...

The problem is that when i run the app and then switch from the default tab (Where there is actually the text edit) to the other tab, it doesn't switches. And then when i go back to the original tab, my text edit isn't there anymore...

I have tried very much variants and i don't finally understand what i am doing wrong.

Thanks for your time!
Pierre.

[EDIT:] Sorry for my bad english

[jacek]

i don't know how much active it is.

Just take a look around and judge for yourself.

QTabWidget* pSelectedTab = (QTabWidget*)pWidget;

Are you sure this cast is correct? QTabWidget doesn't represent a single tab, but the whole tab container.

Maybe you need only QTabBar?

BTW. Which Qt version do you use?

[hickscorp]

Hello Jacek,

You are right the cast was incorrect (Because it was one of my tests...).
So here is the method which *should* work:

void CWndMainImpl::EditorTabChanged (QWidget* pWidget) {
	pTextViewer->setParent(pWidget);
}

void CWndMainImpl::EditorTabChanged (QWidget* pWidget) {
	pTextViewer->setParent(pWidget);
}

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But it does the same
The interesting point is that when i create my text box, i do as follows:

pTextViewer	= new QTextEdit;
pTextViewer->setParent(tabFile_New1);
connect( tabCtnrEditor, SIGNAL(currentChanged(QWidget*)), this, SLOT(EditorTabChanged(QWidget*)) );

pTextViewer	= new QTextEdit;
pTextViewer->setParent(tabFile_New1);
connect( tabCtnrEditor, SIGNAL(currentChanged(QWidget*)), this, SLOT(EditorTabChanged(QWidget*)) );

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And the parent i give is ok.
But then once the parent is set up, if i try to change the edit box's parent, it doesn't works as i'm expecting.

[EDIT:] The version i'm using is QT 4.2, i don't know the minor version (Standard Edgy package).

Anyway, thanks a lot for your help.
Pierre.

[jacek]

Try this:

void CWndMainImpl::EditorTabChanged (QWidget* pWidget) {
	pTextViewer->setParent(pWidget);
	pTextViewer->show();
}

void CWndMainImpl::EditorTabChanged (QWidget* pWidget) {
	pTextViewer->setParent(pWidget);
	pTextViewer->show();
}

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But IMO you should use only QTabBar instead of the whole QTabWidget.

[hickscorp]

Hey, the show() method worked!
I clearly don't understand the "why" but i thanks you a lot for the "how"

About using a QTabBar, i don't understand the difference on what i'm doing ?
My problem is that i'm writing code on a derivated class from a ui_* generated by QTDesigner... And i'm not sure if i can place a QTabBar within QTDesigner in the right place, between the right spacers

Anyway thanks again, i'll try a lookup at the trolltech docs on how to use QTabBar.

Pierre.

[jacek]

About using a QTabBar, i don't understand the difference on what i'm doing ?

In short: QTabWidget == QTabBar + QStackedWidget, but clearly you don't want to use QStackedWidget part, so the only thing left is QTabBar

[hickscorp]

I see, i'll try to look closer at this option.

Thanks for the answers!
Pierre.