simple questions. qt3 to qt4

[impeteperry]

Hi. I am having a great deal of trouble with some of the documentation in Qt4. I have spent a lot of time on just these 2 VERY BASIC items

Qt3: text = listBox ->text ( index ); and/or item index from QListBox. how in QListView or QListWidget or ???

Qt3: textEdit-> undo & textEdit->redo
in Qt4 I can find out if they are enabled, but not how to use them.

I would appreciate some help
thanks

[munna]

Qt3: text = listBox ->text ( index ); and/or item index from QListBox. how in QListView or QListWidget or ???

QListWidget

item(row)->text()

in Qt4 I can find out if they are enabled, but not how to use them.

Look at editing key bindings in QTextEdit class Reference.

[impeteperry]

QListWidget

item(row)->text()



Look at editing key bindings in QTextEdit class Reference.

Thanks, but, if I understand your suggestion corectly, key bindings are not what I'm looking for.
I am writing a program, not using one.
my question is "How do I put, in my program, the functionality of textedit's "undo" & "redo" present in Qt3?

[impeteperry]

I have solved my list box problem by using QListWidget, but the "undo" and "redo" remain.

[jpn]

"undo" and "redo" remain

This should make your life easier..

textEdit->setUndoRedoEnabled(true);
actionUndo->setEnabled(false);
actionRedo->setEnabled(false);
connect(actionUndo, SIGNAL(triggered()), textEdit->document(), SLOT(undo()));
connect(actionRedo, SIGNAL(triggered()), textEdit->document(), SLOT(redo()));
connect(textEdit, SIGNAL(undoAvailable(bool)), actionUndo, SLOT(setEnabled(bool)));
connect(textEdit, SIGNAL(redoAvailable(bool)), actionRedo, SLOT(setEnabled(bool)));

textEdit->setUndoRedoEnabled(true);
actionUndo->setEnabled(false);
actionRedo->setEnabled(false);
connect(actionUndo, SIGNAL(triggered()), textEdit->document(), SLOT(undo()));
connect(actionRedo, SIGNAL(triggered()), textEdit->document(), SLOT(redo()));
connect(textEdit, SIGNAL(undoAvailable(bool)), actionUndo, SLOT(setEnabled(bool)));
connect(textEdit, SIGNAL(redoAvailable(bool)), actionRedo, SLOT(setEnabled(bool)));

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See also Editing key bindings.

[impeteperry]

Thanks, What it looks like is that they have dropped the "undo" & "redo" functions entirely in Qt4, and what you suggest is a "work around". I can do that, but I'm not happy.

Thanks for your help. I really needed that.

[jpn]

What it looks like is that they have dropped the "undo" & "redo" functions entirely in Qt4, and what you suggest is a "work around". I can do that, but I'm not happy.

It's not a "workaround". The new QTextEdit (and QTextBrowser) is based on the underlying document. QTextDocument is a new class in Qt 4 and represents the structure of a rich text document. The document is now responsible for undo/redo functionality. What are you not happy with? Too complicated?

[impeteperry]

Your comment is funny and kind of hits the mark.
In all the programming I have done since the '70s (self taught) that which I didn't understand seemed complicated.
For some reason this switch from Qt3 to Qt4 has been dificult for me.
Looking at the QTextEdit documentation, I did not see a reference to QTextDocument, so I did not find the "undo" function which I knew had to be somewhere. I did a search for "undo" on the whole QTextEdit class document, came up with the "isUndoEnabled"s but no plain "undo."

Thanks to you, I'm now happy.

[impeteperry]

i should say "almost" happy.
Thanks to your help and the "textEdit" demo, I now have a QTextEdit where I can edit, undo & redo BUT I need to convert the QTextStream to a QString. i see that there is a "QTextStream::readAll ();" member to do that, But I am having trouble codeing it.
Among many uses,i have a large number of small strings (people's addreses" which I keep in a "StringList" for easy handling.

Some more help would be appreciated.

PS. What I don't understand; I use a "QTextEdit" widget to edit some text.
"now is the tim for all good men\nto come to the aid.....", I miss-spelled "time" so I go to the widget that is designed to "edit text", or so it's name implies, and add the "e" to "tim". And I should now have a "now is the time for all good men\nto come to the aid....." bit of text, but no, I now have a QTextStream what ever that is. There is enough functionality in QString for me to implement my own "undo/redo" and most of the other stuff that they have put in "TextEdit" as shown in the demo. It looks like "Microsolt" wrote it to me.
There, now if I could get my text out of "textEdit" I would really be happy.

Please excuse the blow off.

[jpn]

I find << and >> operators convenient.
You don't "convert" a stream to a string, you read from a stream to a string.

Following example demonstrates usage of QTextStream and QStringList:

QString string1("string 1");
QString string2("string 2");
 
QString data;
QTextStream textStream(&data);
 
// writing strings to a stream
textStream << string1 << " " << string2;
 
// stream's internal data
qDebug() << data; // outputs "string 1 string 2"
 
// reading from a stream to a string list
QStringList wordList;
while (!textStream.atEnd())
{
	QString word;
	textStream >> word;
	wordList << word;
}
 
qDebug() << wordList; // outputs ("string", "1", "string", "2")
 
// writing a string list to a stream
foreach (QString word, wordList)
	textStream << word;
 
qDebug() << textStream.readAll(); // outputs "string1string2"

QString string1("string 1");
QString string2("string 2");

QString data;
QTextStream textStream(&data);

// writing strings to a stream
textStream << string1 << " " << string2;

// stream's internal data
qDebug() << data; // outputs "string 1 string 2"

// reading from a stream to a string list
QStringList wordList;
while (!textStream.atEnd())
{
	QString word;
	textStream >> word;
	wordList << word;
}

qDebug() << wordList; // outputs ("string", "1", "string", "2")

// writing a string list to a stream
foreach (QString word, wordList)
	textStream << word;

qDebug() << textStream.readAll(); // outputs "string1string2"

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Hope you find it useful! And if not, please give a bit more comprehensive explanation of what you are trying to do..

[impeteperry]

while I'm digesting your reply. let me give youa run down on what I'n doing.

1. I am an engineer and am writing programs for specific applications for non-computer savy users.
2. I do not use "pop-up" or "tool bars" in the usual sense.
3. I use a "control" string for program control.
" a,b,c,d,e,f, etc." where each position will have progam information. For example "e" might be "123-4x16" representing the location of column "d" on level "b" etc. With this system any module or function knows what it is dealing with by accessing this control string.
4 I use a "functionNumber" for program flow.
5 I have a "masterList" QStringList where each element in the list is itself a QStringList which can be split into ies own string list, names of buttons, prompts etc. each element in these sub-lists are keyed to the functionNumber.
It is this masterlist I need to be able to edit. I Join the elements into one long string and put it in a "textEdit" widget for editing.
6. Program operation is totally language ( and/or spelling ) independent. With the "signal-slot" system, programming is a breeze.
7. I have a row of Pushbuttons accross the bottom of the screen and a row of labels obove them representing the keyboard function keys for implementing a given function. The labels on the pushbuttons name the function. The names come from the appropiate sub-list of the master list mentioned above.
8. The user has his/her choice of pushing a function key, entering an accelerator key (given in the label on the push button) ,clicking on a pushbutton with the mouse or dbl clicking on an option when there is one.

The key to the whole system is the masterList. I have a single textEdit Wiget with the MasterList broken down in to a single string text. Qt3 was great for this.

If I know how to attach a snapshot I would or if you send me an e-mail at "impeteperry@cox.net" I can send you some.