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QInputDialog 类

QInputDialog 类提供从用户获得单一值的简单方便对话框。 更多...

头： #include <QInputDialog>
qmake: QT += widgets
继承： QDialog

公共类型

enum InputDialogOption { NoButtons, UseListViewForComboBoxItems, UsePlainTextEditForTextInput }
flags InputDialogOptions
enum InputMode { TextInput, IntInput, DoubleInput }

特性

公共函数

QInputDialog (QWidget * parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())
virtual ~QInputDialog ()
QString cancelButtonText () const
QStringList comboBoxItems () const
int doubleDecimals () const
double doubleMaximum () const
double doubleMinimum () const
double doubleStep () const
double doubleValue () const
QInputDialog::InputMode inputMode () const
int intMaximum () const
int intMinimum () const
int intStep () const
int intValue () const
bool isComboBoxEditable () const
QString labelText () const
QString okButtonText () const
void open (QObject * receiver , const char * member )
QInputDialog::InputDialogOptions options () const
void setCancelButtonText (const QString & text )
void setComboBoxEditable (bool editable )
void setComboBoxItems (const QStringList & 项 )
void setDoubleDecimals (int decimals )
void setDoubleMaximum (double max )
void setDoubleMinimum (double min )
void setDoubleRange (double min , double max )
void setDoubleStep (double step )
void setDoubleValue (double value )
void setInputMode (QInputDialog::InputMode mode )
void setIntMaximum (int max )
void setIntMinimum (int min )
void setIntRange (int min , int max )
void setIntStep (int step )
void setIntValue (int value )
void setLabelText (const QString & text )
void setOkButtonText (const QString & text )
void setOption (QInputDialog::InputDialogOption option , bool on = true)
void setOptions (QInputDialog::InputDialogOptions options )
void setTextEchoMode (QLineEdit::EchoMode mode )
void setTextValue (const QString & text )
bool testOption (QInputDialog::InputDialogOption option ) const
QLineEdit::EchoMode textEchoMode () const
QString textValue () const

重实现公共函数

virtual void done (int result ) override
virtual QSize minimumSizeHint () const override
virtual void setVisible (bool visible ) override
virtual QSize sizeHint () const override

信号

void doubleValueChanged (double value )
void doubleValueSelected (double value )
void intValueChanged (int value )
void intValueSelected (int value )
void textValueChanged (const QString & text )
void textValueSelected (const QString & text )

静态公共成员

double getDouble (QWidget * parent , const QString & title , const QString & label , double value = 0, double min = -2147483647, double max = 2147483647, int decimals = 1, bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), double step = 1)
int getInt (QWidget * parent , const QString & title , const QString & label , int value = 0, int min = -2147483647, int max = 2147483647, int step = 1, bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())
QString getItem (QWidget * parent , const QString & title , const QString & label , const QStringList & 项 , int current = 0, bool editable = true, bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QString getMultiLineText (QWidget * parent , const QString & title , const QString & label , const QString & text = QString(), bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QString getText (QWidget * parent , const QString & title , const QString & label , QLineEdit::EchoMode mode = QLineEdit::Normal, const QString & text = QString(), bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), Qt::InputMethodHints inputMethodHints = Qt::ImhNone)

详细描述

The input value can be a string, a number or an item from a list. A label must be set to tell the user what they should enter.

Five static convenience functions are provided: getText (), getMultiLineText (), getInt (), getDouble ()，和 getItem (). All the functions can be used in a similar way, for example: 

    bool ok;
    QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
                                         tr("User name:"), QLineEdit::Normal,
                                         QDir::home().dirName(), &ok);
    if (ok && !text.isEmpty())
        textLabel->setText(text);

The ok variable is set to true if the user clicks OK ; otherwise, it is set to false.

Input Dialogs

The 标准对话框 example shows how to use QInputDialog as well as other built-in Qt dialogs.

另请参阅 QMessageBox and 标准对话框范例 .

成员类型文档编制

enum QInputDialog:: InputDialogOption
flags QInputDialog:: InputDialogOptions

This enum specifies various options that affect the look and feel of an input dialog.

常量 值 描述
QInputDialog::NoButtons 0x00000001 不显示 OK and Cancel buttons (useful for "live dialogs").
QInputDialog::UseListViewForComboBoxItems 0x00000002 Use a QListView rather than a non-editable QComboBox for displaying the items set with setComboBoxItems ().
QInputDialog::UsePlainTextEditForTextInput 0x00000004 Use a QPlainTextEdit for multiline text input. This value was introduced in 5.2.

该枚举在 Qt 4.5 引入或被修改。

The InputDialogOptions type is a typedef for QFlags <InputDialogOption>. It stores an OR combination of InputDialogOption values.

另请参阅 options , setOption ()，和 testOption ().

enum QInputDialog:: InputMode

This enum describes the different modes of input that can be selected for the dialog.

常量 值 描述
QInputDialog::TextInput 0 Used to input text strings.
QInputDialog::IntInput 1 Used to input integers.
QInputDialog::DoubleInput 2 Used to input floating point numbers with double precision accuracy.

该枚举在 Qt 4.5 引入或被修改。

另请参阅 inputMode .

特性文档编制

cancelButtonText : QString

This property holds the text for the button used to cancel the dialog

该特性在 Qt 4.5 引入。

访问函数：

QString cancelButtonText () const
void setCancelButtonText (const QString & text )

comboBoxEditable : bool

This property holds whether or not the combo box used in the input dialog is editable

该特性在 Qt 4.5 引入。

访问函数：

bool isComboBoxEditable () const
void setComboBoxEditable (bool editable )

comboBoxItems : QStringList

This property holds the items used in the combo box for the input dialog

该特性在 Qt 4.5 引入。

访问函数：

QStringList comboBoxItems () const
void setComboBoxItems (const QStringList & 项 )

doubleDecimals : int

sets the precision of the double spinbox in decimals

该特性在 Qt 4.5 引入。

访问函数：

int doubleDecimals () const
void setDoubleDecimals (int decimals )

另请参阅 QDoubleSpinBox::setDecimals ().

doubleMaximum : double

This property holds the maximum double precision floating point value accepted as input

This property is only relevant when the input dialog is used in DoubleInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

double doubleMaximum () const
void setDoubleMaximum (double max )

doubleMinimum : double

This property holds the minimum double precision floating point value accepted as input

This property is only relevant when the input dialog is used in DoubleInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

double doubleMinimum () const
void setDoubleMinimum (double min )

doubleStep : double

This property holds the step by which the double value is increased and decreased

This property is only relevant when the input dialog is used in DoubleInput 模式。

该特性在 Qt 5.10 引入。

访问函数：

double doubleStep () const
void setDoubleStep (double step )

doubleValue : int

This property holds the current double precision floating point value accepted as input

This property is only relevant when the input dialog is used in DoubleInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

double doubleValue () const
void setDoubleValue (double value )

通知程序信号：

void doubleValueChanged (double value )

inputMode : InputMode

This property holds the mode used for input

This property helps determine which widget is used for entering input into the dialog.

该特性在 Qt 4.5 引入。

访问函数：

QInputDialog::InputMode inputMode () const
void setInputMode (QInputDialog::InputMode mode )

intMaximum : int

This property holds the maximum integer value accepted as input

This property is only relevant when the input dialog is used in IntInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

int intMaximum () const
void setIntMaximum (int max )

intMinimum : int

This property holds the minimum integer value accepted as input

This property is only relevant when the input dialog is used in IntInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

int intMinimum () const
void setIntMinimum (int min )

intStep : int

This property holds the step by which the integer value is increased and decreased

This property is only relevant when the input dialog is used in IntInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

int intStep () const
void setIntStep (int step )

intValue : int

This property holds the current integer value accepted as input

This property is only relevant when the input dialog is used in IntInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

int intValue () const
void setIntValue (int value )

通知程序信号：

void intValueChanged (int value )

labelText : QString

This property holds the label's text which describes what needs to be input

该特性在 Qt 4.5 引入。

访问函数：

QString labelText () const
void setLabelText (const QString & text )

okButtonText : QString

This property holds the text for the button used to accept the entry in the dialog

该特性在 Qt 4.5 引入。

访问函数：

QString okButtonText () const
void setOkButtonText (const QString & text )

options : InputDialogOptions

This property holds the various options that affect the look and feel of the dialog

默认情况下，所有选项是被禁用的。

该特性在 Qt 4.5 引入。

访问函数：

QInputDialog::InputDialogOptions options () const
void setOptions (QInputDialog::InputDialogOptions options )

另请参阅 setOption () 和 testOption ().

textEchoMode : QLineEdit::EchoMode

This property holds the echo mode for the text value

This property is only relevant when the input dialog is used in TextInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

QLineEdit::EchoMode textEchoMode () const
void setTextEchoMode (QLineEdit::EchoMode mode )

textValue : QString

This property holds the text value for the input dialog

This property is only relevant when the input dialog is used in TextInput 模式。

该特性在 Qt 4.5 引入。

访问函数：

QString textValue () const
void setTextValue (const QString & text )

通知程序信号：

void textValueChanged (const QString & text )

成员函数文档编制

QInputDialog:: QInputDialog ( QWidget * parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())

Constructs a new input dialog with the given parent and window flags .

该函数在 Qt 4.5 引入。

[signal] void QInputDialog:: doubleValueChanged ( double value )

This signal is emitted whenever the double value changes in the dialog. The current value is specified by value .

This signal is only relevant when the input dialog is used in DoubleInput 模式。

注意： 通知程序信号对于特性 doubleValue .

[signal] void QInputDialog:: doubleValueSelected ( double value )

This signal is emitted whenever the user selects a double value by accepting the dialog; for example, by clicking the OK button. The selected value is specified by value .

This signal is only relevant when the input dialog is used in DoubleInput 模式。

[signal] void QInputDialog:: intValueChanged ( int value )

This signal is emitted whenever the integer value changes in the dialog. The current value is specified by value .

This signal is only relevant when the input dialog is used in IntInput 模式。

注意： 通知程序信号对于特性 intValue .

[signal] void QInputDialog:: intValueSelected ( int value )

This signal is emitted whenever the user selects a integer value by accepting the dialog; for example, by clicking the OK button. The selected value is specified by value .

This signal is only relevant when the input dialog is used in IntInput 模式。

[signal] void QInputDialog:: textValueChanged (const QString & text )

This signal is emitted whenever the text string changes in the dialog. The current string is specified by text .

This signal is only relevant when the input dialog is used in TextInput 模式。

注意： 通知程序信号对于特性 textValue .

[signal] void QInputDialog:: textValueSelected (const QString & text )

This signal is emitted whenever the user selects a text string by accepting the dialog; for example, by clicking the OK button. The selected string is specified by text .

This signal is only relevant when the input dialog is used in TextInput 模式。

[虚拟] QInputDialog:: ~QInputDialog ()

Destroys the input dialog.

该函数在 Qt 4.5 引入。

[override virtual] void QInputDialog:: done ( int result )

重实现： QDialog::done (int r).

关闭对话框并将其结果代码设为 result 。若此对话框的展示是采用 exec ()，done() 导致本地事件循环的完成，且 exec () 返回 result .

另请参阅 QDialog::done ().

[static] double QInputDialog:: getDouble ( QWidget * parent , const QString & title , const QString & label , double value = 0, double min = -2147483647, double max = 2147483647, int decimals = 1, bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), double step = 1)

Static convenience function to get a floating point number from the user.

title is the text which is displayed in the title bar of the dialog. label is the text which is shown to the user (it should say what should be entered). value is the default floating point number that the line edit will be set to. min and max are the minimum and maximum values the user may choose. decimals is the maximum number of decimal places the number may have. step is the amount by which the values change as the user presses the arrow buttons to increment or decrement the value.

若 ok is nonnull, * ok will be set to true if the user pressed OK and to false if the user pressed Cancel . The dialog's parent is parent . The dialog will be modal and uses the widget flags .

This function returns the floating point number which has been entered by the user.

Use this static function like this: 

    bool ok;
    double d = QInputDialog::getDouble(this, tr("QInputDialog::getDouble()"),
                                       tr("Amount:"), 37.56, -10000, 10000, 2, &ok,
                                       Qt::WindowFlags(), 1);
    if (ok)
        doubleLabel->setText(QString("$%1").arg(d));

另请参阅 getText (), getInt (), getItem ()，和 getMultiLineText ().

[static] int QInputDialog:: getInt ( QWidget * parent , const QString & title , const QString & label , int value = 0, int min = -2147483647, int max = 2147483647, int step = 1, bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags())

Static convenience function to get an integer input from the user.

title is the text which is displayed in the title bar of the dialog. label is the text which is shown to the user (it should say what should be entered). value is the default integer which the spinbox will be set to. min and max are the minimum and maximum values the user may choose. step is the amount by which the values change as the user presses the arrow buttons to increment or decrement the value.

若 ok is nonnull * ok will be set to true if the user pressed OK and to false if the user pressed Cancel . The dialog's parent is parent . The dialog will be modal and uses the widget flags .

On success, this function returns the integer which has been entered by the user; on failure, it returns the initial value .

Use this static function like this: 

    bool ok;
    int i = QInputDialog::getInt(this, tr("QInputDialog::getInt()"),
                                 tr("Percentage:"), 25, 0, 100, 1, &ok);
    if (ok)
        integerLabel->setText(tr("%1%").arg(i));

该函数在 Qt 4.5 引入。

另请参阅 getText (), getDouble (), getItem ()，和 getMultiLineText ().

[static] QString QInputDialog:: getItem ( QWidget * parent , const QString & title , const QString & label , const QStringList & 项 , int current = 0, bool editable = true, bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), Qt::InputMethodHints inputMethodHints = Qt::ImhNone)

Static convenience function to let the user select an item from a string list.

title is the text which is displayed in the title bar of the dialog. label is the text which is shown to the user (it should say what should be entered). 项 is the string list which is inserted into the combo box. current is the number of the item which should be the current item. inputMethodHints is the input method hints that will be used if the combo box is editable and an input method is active.

若 editable is true the user can enter their own text; otherwise, the user may only select one of the existing items.

若 ok is nonnull *ok will be set to true if the user pressed OK and to false if the user pressed Cancel . The dialog's parent is parent . The dialog will be modal and uses the widget flags .

This function returns the text of the current item, or if editable is true, the current text of the combo box.

Use this static function like this: 

    QStringList items;
    items << tr("Spring") << tr("Summer") << tr("Fall") << tr("Winter");
    bool ok;
    QString item = QInputDialog::getItem(this, tr("QInputDialog::getItem()"),
                                         tr("Season:"), items, 0, false, &ok);
    if (ok && !item.isEmpty())
        itemLabel->setText(item);

另请参阅 getText (), getInt (), getDouble ()，和 getMultiLineText ().

[static] QString QInputDialog:: getMultiLineText ( QWidget * parent , const QString & title , const QString & label , const QString & text = QString(), bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), Qt::InputMethodHints inputMethodHints = Qt::ImhNone)

Static convenience function to get a multiline string from the user.

title is the text which is displayed in the title bar of the dialog. label is the text which is shown to the user (it should say what should be entered). text is the default text which is placed in the plain text edit. inputMethodHints is the input method hints that will be used in the edit widget if an input method is active.

若 ok is nonnull *ok will be set to true if the user pressed OK and to false if the user pressed Cancel . The dialog's parent is parent . The dialog will be modal and uses the specified widget flags .

If the dialog is accepted, this function returns the text in the dialog's plain text edit. If the dialog is rejected, a null QString 被返回。

Use this static function like this: 

    bool ok;
    QString text = QInputDialog::getMultiLineText(this, tr("QInputDialog::getMultiLineText()"),
                                                  tr("Address:"), "John Doe\nFreedom Street", &ok);
    if (ok && !text.isEmpty())
        multiLineTextLabel->setText(text);

该函数在 Qt 5.2 引入。

另请参阅 getInt (), getDouble (), getItem ()，和 getText ().

[static] QString QInputDialog:: getText ( QWidget * parent , const QString & title , const QString & label , QLineEdit::EchoMode mode = QLineEdit::Normal, const QString & text = QString(), bool * ok = nullptr, Qt::WindowFlags flags = Qt::WindowFlags(), Qt::InputMethodHints inputMethodHints = Qt::ImhNone)

Static convenience function to get a string from the user.

title is the text which is displayed in the title bar of the dialog. label is the text which is shown to the user (it should say what should be entered). text is the default text which is placed in the line edit. mode is the echo mode the line edit will use. inputMethodHints is the input method hints that will be used in the edit widget if an input method is active.

若 ok is nonnull *ok will be set to true if the user pressed OK and to false if the user pressed Cancel . The dialog's parent is parent . The dialog will be modal and uses the specified widget flags .

If the dialog is accepted, this function returns the text in the dialog's line edit. If the dialog is rejected, a null QString 被返回。

Use this static function like this: 

    bool ok;
    QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
                                         tr("User name:"), QLineEdit::Normal,
                                         QDir::home().dirName(), &ok);
    if (ok && !text.isEmpty())
        textLabel->setText(text);

另请参阅 getInt (), getDouble (), getItem ()，和 getMultiLineText ().

[override virtual] QSize QInputDialog:: minimumSizeHint () const

重实现： QDialog::minimumSizeHint () const.

void QInputDialog:: open ( QObject * receiver , const char * member )

This function connects one of its signals to the slot specified by receiver and member . The specific signal depends on the arguments that are specified in member . These are:

将从槽断开信号连接，当关闭对话框时。

该函数在 Qt 4.5 引入。

void QInputDialog:: setDoubleRange ( double min , double max )

Sets the range of double precision floating point values accepted by the dialog when used in DoubleInput mode, with minimum and maximum values specified by min and max 分别。

void QInputDialog:: setIntRange ( int min , int max )

Sets the range of integer values accepted by the dialog when used in IntInput mode, with minimum and maximum values specified by min and max 分别。

void QInputDialog:: setOption ( QInputDialog::InputDialogOption option , bool on = true)

设置给定 option 为被启用若 on 为 true；否则，清零给定 option .

另请参阅 options and testOption ().

[override virtual] void QInputDialog:: setVisible ( bool visible )

重实现： QDialog::setVisible (bool visible).

[override virtual] QSize QInputDialog:: sizeHint () const

重实现： QDialog::sizeHint () const.

bool QInputDialog:: testOption ( QInputDialog::InputDialogOption option ) const

返回 true 若给定 option 被启用；否则，返回 false。

另请参阅 options and setOption ().

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