using cut(), copy(), paste()

Hello. I have a program which have Edit menu, where I have cut, copy and paste.
I tried to use these menus with the following:

Code:

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...
 connect(action_Copy,SIGNAL(triggered()),lineEdit_2,SLOT(copy()));
 connect(action_Copy,SIGNAL(triggered()),lineEdit_3,SLOT(copy()));
...

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Now the copy menu works, but there is over one million connect there... How can I optimise this situation? I thinked about for cycle but I search other, better solution... Please help, thanks

Hey you will be calling one million "copy()" slots of line edit on each trigger of action_Copy. I think it is wrong (i might be wrong as i don't have any other info from you)

Instead have a custom slot - say on_Copy() to be triggered by action_Copy, and in that obtain the line edit with keyboard focus. After that just call obtainedLineEdit->copy().

Quote:

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Originally Posted by Gopala Krishna

Hey you will be calling one million "copy()" slots of line edit on each trigger of action_Copy. I think it is wrong (i might be wrong as i don't have any other info from you)

Instead have a custom slot - say on_Copy() to be triggered by action_Copy, and in that obtain the line edit with keyboard focus. After that just call obtainedLineEdit->copy().

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But how can I resolve this?

Let's say you have a class called Window which contains those line edits.

You would begin with declaring a new custom slot:

Code:

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class Window : public WhatEver
{
    Q_OBJECT // <---
public:
    [...]
 
private slots:
    void copy(); // <---
};

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Then, instead of connecting to each line edit's copy(), you would connect to this custom slot we declared above:

Code:

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connect(action_Copy,SIGNAL(triggered()),this,SLOT(copy()));

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Finally, you would implement the custom slot. More or less something like this:

Code:

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void Window::copy()
{
    // get the last child widget which has focus and
    // try to cast it as line edit
    QLineEdit* lineEdit = dynamic_cast<QLineEdit*>(focusWidget());
    if (lineEdit)
    {
        // it was a line edit, perform copy
        lineEdit->copy();
    }
}

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Quote:

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Originally Posted by jpn

Code:

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QLineEdit* lineEdit = dynamic_cast<QLineEdit*>(focusWidget());

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Thanks. This is what I searched for...

Awesome! I have been trying to find out how to do that for months now!