QErrorMessage 类提供错误消息显示对话框。 更多...
| 头： | #include <QErrorMessage> |
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets) |
| qmake: | QT += widgets |
| 继承： | QDialog |
| QErrorMessage (QWidget * parent = nullptr) | |
| virtual | ~QErrorMessage () |
| void | showMessage (const QString & message ) |
| void | showMessage (const QString & message , const QString & type ) |
| QErrorMessage * | qtHandler () |
| virtual void | changeEvent (QEvent * e ) override |
| virtual void | done (int a ) override |
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 use QErrorMessage like this, you create the dialog in the usual way, and show it by calling the showMessage () slot or connecting signals to it.
静态 qtHandler () function installs a message handler using qInstallMessageHandler () and creates a QErrorMessage that displays qDebug (), qWarning () 和 qFatal () messages. This is most useful in environments where no console is available to display warnings and error messages.
In both cases QErrorMessage 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.
The 标准对话框 example shows how to use QErrorMessage as well as other built-in Qt dialogs.
另请参阅 QMessageBox , QStatusBar::showMessage ()，和 标准对话框范例 .
[explicit]
QErrorMessage::
QErrorMessage
(
QWidget
*
parent
= nullptr)
Constructs and installs an error handler window with the given parent .
默认 window modality of the dialog depends on the platform. The window modality can be overridden via setWindowModality () 先于调用 showMessage ().
[virtual noexcept]
QErrorMessage::
~QErrorMessage
()
销毁错误消息对话框。
[override virtual protected]
void
QErrorMessage::
changeEvent
(
QEvent
*
e
)
重实现： QWidget::changeEvent (QEvent *event).
[override virtual protected]
void
QErrorMessage::
done
(
int
a
)
重实现： QDialog::done (int r).
[static]
QErrorMessage
*QErrorMessage::
qtHandler
()
返回指针指向 QErrorMessage object that outputs the default Qt messages. This function creates such an object, if there isn't one already.
The object will only output log messages of QLoggingCategory::defaultCategory ().
The object will forward all messages to the original message handler.
另请参阅 qInstallMessageHandler .
[slot]
void
QErrorMessage::
showMessage
(const
QString
&
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
(const
QString
&
message
, const
QString
&
type
)
这是重载函数。
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.
另请参阅 showMessage ().