Contents

• Public Functions
• Public Slots
• Static Public Members
• Reimplemented Protected Functions
• Detailed Description

Detailed Description

TheQErrorMessage class provides an error message display dialog.

An error message widget consists of a text label and a checkbox. The checkbox lets the user control whether the same error message will be displayed again in the future, typically displaying the text, "Show this message again" translated into the appropriate local language.

For production applications, the class can be used to display messages which the user only needs to see once. To useQErrorMessage like this, you create the dialog in the usual way, and show it by calling theshowMessage() slot or connecting signals to it.

The staticqtHandler() function installs a message handler usingqInstallMsgHandler() and creates aQErrorMessage that displaysqDebug(),qWarning() andqFatal() messages. This is most useful in environments where no console is available to display warnings and error messages.

In both casesQErrorMessage will queue pending messages and display them in order, with each new message being shown as soon as the user has accepted the previous message. Once the user has specified that a message is not to be shown again it is automatically skipped, and the dialog will show the next appropriate message in the queue.

TheStandard Dialogs example shows how to useQErrorMessage as well as other built-in Qt dialogs.

Member Function Documentation

QErrorMessage::QErrorMessage(QWidget * parent = 0)

Constructs and installs an error handler window with the givenparent.

QErrorMessage::~QErrorMessage()

Destroys the error message dialog.

[virtual protected]void QErrorMessage::changeEvent(QEvent * e)

Reimplemented fromQWidget::changeEvent().

[virtual protected]void QErrorMessage::done(int a)

Reimplemented fromQDialog::done().

[static]QErrorMessage * QErrorMessage::qtHandler()

Returns a pointer to aQErrorMessage object that outputs the default Qt messages. This function creates such an object, if there isn't one already.

[slot]void QErrorMessage::showMessage(constQString & message)

Shows the given message,message, and returns immediately. If the user has requested for the message not to be shown again, this function does nothing.

Normally, the message is displayed immediately. However, if there are pending messages, it will be queued to be displayed later.

[slot]void QErrorMessage::showMessage(constQString & message, constQString & type)

This is an overloaded function.

Shows the given message,message, and returns immediately. If the user has requested for messages of type,type, not to be shown again, this function does nothing.

Normally, the message is displayed immediately. However, if there are pending messages, it will be queued to be displayed later.

This function was introduced in Qt 4.5.

See alsoshowMessage().