How Best to Prevent Focus Leaving a Widget?
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I have a need within a given Qt window (main and dock) to validate data that has been entered in a field-type widget (QLineEdit typically), and not allow the keyboard focus to move to a different widget in the same window when the data is invalid. There are informational events for the widgets involved in the focus transfer, but not a way to directly block the focus out (event).
Does anyone have a suggestion for what the best way to do this is?
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Hi,
In that case shouldn't you use a modal QDialog to ensure your user can't do anything you don't want while the input is wrong ?
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I suggest exploring alternatives also:
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Mark fields with invalid values and disable "apply" "ok" and similar controls until all invalid values are corrected
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Revert to the last known good value if the user leaves a field with an invalid value in it
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Prevent entering an invalid value by restricting what users can type
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You could go and set all other widgets to disabled
void QWidget::setDisabled(bool disable)convenient enough, if you have a good Layouttree
