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rubyqtqt4

How do I keep a value within QLineEdit to retain its value after program is closed?

I am using Qt Ruby

How do I keep the value of a user entered QlineEdit to keep its state even after the program is closed, in that way, the user can access the contents the next time he opens the program.

Solution

  • Solution 1 - using File.write/read:

    edit_widget = Qt::LineEdit.new(parent)
File.write(filename, edit_widget.text)
exit

    After the program re-start:

    text = File.read(filename)
edit_widget.setText text

    Solution 2 - using QSettings:

    settings = Qt::Settings.new(filename, Qt::Settings::NativeFormat)

edit_widget = Qt::LineEdit.new(parent)
edit_widget.text = "abcde"

settings.setValue("field1", Qt::Variant.fromValue(edit_widget.text))
settings.sync
exit

    After the program re-start:

    settings = Qt::Settings.new(filename, Qt::Settings::NativeFormat)
edit_widget = Qt::LineEdit.new(parent)
edit_widget.text = settings.value("field1").toString