The QDialogButtonBox class is a widget that presents buttons in a layout that is appropriate to the current widget style. 更多...
| 头： | #include <QDialogButtonBox> |
| qmake: | QT += widgets |
| Since: | Qt 4.2 |
| 继承： | QWidget |
| enum | ButtonLayout { WinLayout, MacLayout, KdeLayout, GnomeLayout, AndroidLayout } |
| enum | ButtonRole { InvalidRole, AcceptRole, RejectRole, DestructiveRole, ..., NRoles } |
| enum | StandardButton { Ok, Open, Save, Cancel, ..., NoButton } |
| flags | StandardButtons |
| QDialogButtonBox (QWidget * parent = nullptr) | |
| QDialogButtonBox (Qt::Orientation orientation , QWidget * parent = nullptr) | |
| QDialogButtonBox (QDialogButtonBox::StandardButtons buttons , QWidget * parent = nullptr) | |
| QDialogButtonBox (QDialogButtonBox::StandardButtons buttons , Qt::Orientation orientation , QWidget * parent = nullptr) | |
| virtual | ~QDialogButtonBox () |
| void | addButton (QAbstractButton * button , QDialogButtonBox::ButtonRole role ) |
| QPushButton * | addButton (const QString & text , QDialogButtonBox::ButtonRole role ) |
| QPushButton * | addButton (QDialogButtonBox::StandardButton button ) |
| QPushButton * | button (QDialogButtonBox::StandardButton which ) const |
| QDialogButtonBox::ButtonRole | buttonRole (QAbstractButton * button ) const |
| QList<QAbstractButton *> | buttons () const |
| bool | centerButtons () const |
| void | clear () |
| Qt::Orientation | orientation () const |
| void | removeButton (QAbstractButton * button ) |
| void | setCenterButtons (bool center ) |
| void | setOrientation (Qt::Orientation orientation ) |
| void | setStandardButtons (QDialogButtonBox::StandardButtons buttons ) |
| QDialogButtonBox::StandardButton | standardButton (QAbstractButton * button ) const |
| QDialogButtonBox::StandardButtons | standardButtons () const |
| void | accepted () |
| void | clicked (QAbstractButton * button ) |
| void | helpRequested () |
| void | rejected () |
| const QMetaObject | staticMetaObject |
| virtual void | changeEvent (QEvent * event ) override |
| virtual bool | event (QEvent * event ) override |
The QDialogButtonBox class is a widget that presents buttons in a layout that is appropriate to the current widget style.
Dialogs and message boxes typically present buttons in a layout that conforms to the interface guidelines for that platform. Invariably, different platforms have different layouts for their dialogs. QDialogButtonBox allows a developer to add buttons to it and will automatically use the appropriate layout for the user's desktop environment.
大多数对话框按钮遵循某些角色。这些角色包括：
There can also be alternate ways of dismissing the dialog which may cause destructive results.
Most dialogs have buttons that can almost be considered standard (e.g. OK and Cancel buttons). It is sometimes convenient to create these buttons in a standard way.
There are a couple ways of using QDialogButtonBox . One ways is to create the buttons (or button texts) yourself and add them to the button box, specifying their role.
findButton = new QPushButton(tr("&Find"));
findButton->setDefault(true);
moreButton = new QPushButton(tr("&More"));
moreButton->setCheckable(true);
moreButton->setAutoDefault(false);
另外， QDialogButtonBox provides several standard buttons (e.g. OK, Cancel, Save) that you can use. They exist as flags so you can OR them together in the constructor.
buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok
| QDialogButtonBox::Cancel);
connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
You can mix and match normal buttons and standard buttons.
Currently the buttons are laid out in the following way if the button box is horizontal:
|
Button box laid out in horizontal GnomeLayout |
|
Button box laid out in horizontal KdeLayout |
|
Button box laid out in horizontal MacLayout |
|
Button box laid out in horizontal WinLayout |
The buttons are laid out the following way if the button box is vertical:
| GnomeLayout | KdeLayout | MacLayout | WinLayout |
|
|
|
|
Additionally, button boxes that contain only buttons with ActionRole or HelpRole can be considered modeless and have an alternate look on macOS :
| 非模态水平 MacLayout |
|
| 非模态垂直 MacLayout |
|
When a button is clicked in the button box, the clicked () signal is emitted for the actual button is that is pressed. For convenience, if the button has an AcceptRole , RejectRole ，或 HelpRole ， accepted (), rejected ()，或 helpRequested () signals are emitted respectively.
If you want a specific button to be default you need to call QPushButton::setDefault () on it yourself. However, if there is no default button set and to preserve which button is the default button across platforms when using the QPushButton::autoDefault property, the first push button with the accept role is made the default button when the QDialogButtonBox is shown,
另请参阅 QMessageBox , QPushButton ，和 QDialog .
This enum describes the layout policy to be used when arranging the buttons contained in the button box.
| 常量 | 值 | 描述 |
|---|---|---|
QDialogButtonBox::WinLayout
|
0
|
Use a policy appropriate for applications on Windows. |
QDialogButtonBox::MacLayout
|
1
|
Use a policy appropriate for applications on macOS . |
QDialogButtonBox::KdeLayout
|
2
|
Use a policy appropriate for applications on KDE. |
QDialogButtonBox::GnomeLayout
|
3
|
Use a policy appropriate for applications on GNOME. |
QDialogButtonBox::AndroidLayout
|
GnomeLayout + 2
|
Use a policy appropriate for applications on Android. This enum value was added in Qt 5.10. |
The button layout is specified by the current style . However, on the X11 platform, it may be influenced by the desktop environment.
These enums describe flags for standard buttons. Each button has a defined ButtonRole .
| 常量 | 值 | 描述 |
|---|---|---|
QDialogButtonBox::Ok
|
0x00000400
|
An "OK" button defined with the AcceptRole . |
QDialogButtonBox::Open
|
0x00002000
|
An "Open" button defined with the AcceptRole . |
QDialogButtonBox::Save
|
0x00000800
|
A "Save" button defined with the AcceptRole . |
QDialogButtonBox::Cancel
|
0x00400000
|
A "Cancel" button defined with the RejectRole . |
QDialogButtonBox::Close
|
0x00200000
|
A "Close" button defined with the RejectRole . |
QDialogButtonBox::Discard
|
0x00800000
|
A "Discard" or "Don't Save" button, depending on the platform, defined with the DestructiveRole . |
QDialogButtonBox::Apply
|
0x02000000
|
An "Apply" button defined with the ApplyRole . |
QDialogButtonBox::Reset
|
0x04000000
|
A "Reset" button defined with the ResetRole . |
QDialogButtonBox::RestoreDefaults
|
0x08000000
|
A "Restore Defaults" button defined with the ResetRole . |
QDialogButtonBox::Help
|
0x01000000
|
A "Help" button defined with the HelpRole . |
QDialogButtonBox::SaveAll
|
0x00001000
|
A "Save All" button defined with the AcceptRole . |
QDialogButtonBox::Yes
|
0x00004000
|
A "Yes" button defined with the YesRole . |
QDialogButtonBox::YesToAll
|
0x00008000
|
A "Yes to All" button defined with the YesRole . |
QDialogButtonBox::No
|
0x00010000
|
A "No" button defined with the NoRole . |
QDialogButtonBox::NoToAll
|
0x00020000
|
A "No to All" button defined with the NoRole . |
QDialogButtonBox::Abort
|
0x00040000
|
An "Abort" button defined with the RejectRole . |
QDialogButtonBox::Retry
|
0x00080000
|
A "Retry" button defined with the AcceptRole . |
QDialogButtonBox::Ignore
|
0x00100000
|
An "Ignore" button defined with the AcceptRole . |
QDialogButtonBox::NoButton
|
0x00000000
|
无效按钮。 |
StandardButtons 类型是 typedef 对于 QFlags <StandardButton>. It stores an OR combination of StandardButton values.
另请参阅 ButtonRole and standardButtons .
This property holds whether the buttons in the button box are centered
默认情况下，此特性为
false
. This behavior is appopriate for most types of dialogs. A notable exception is message boxes on most platforms (e.g. Windows), where the button box is centered horizontally.
访问函数：
| bool | centerButtons () const |
| void | setCenterButtons (bool center ) |
另请参阅 QMessageBox .
This property holds the orientation of the button box
By default, the orientation is horizontal (i.e. the buttons are laid out side by side). The possible orientations are Qt::Horizontal and Qt::Vertical .
访问函数：
| Qt::Orientation | orientation () const |
| void | setOrientation (Qt::Orientation orientation ) |
collection of standard buttons in the button box
This property controls which standard buttons are used by the button box.
访问函数：
| QDialogButtonBox::StandardButtons | standardButtons () const |
| void | setStandardButtons (QDialogButtonBox::StandardButtons buttons ) |
另请参阅 addButton ().
This enum describes the roles that can be used to describe buttons in the button box. Combinations of these roles are as flags used to describe different aspects of their behavior.
| 常量 | 描述 |
|---|---|
InvalidRole
|
按钮无效。 |
AcceptRole
|
Clicking the button causes the dialog to be accepted (e.g. OK). |
RejectRole
|
Clicking the button causes the dialog to be rejected (e.g. Cancel). |
DestructiveRole
|
Clicking the button causes a destructive change (e.g. for Discarding Changes) and closes the dialog. |
ActionRole
|
点击按钮导致对话框中元素改变。 |
HelpRole
|
可以点击按钮以请求帮助。 |
YesRole
|
The button is a "Yes"-like button. |
NoRole
|
The button is a "No"-like button. |
ApplyRole
|
The button applies current changes. |
ResetRole
|
The button resets the dialog's fields to default values. |
另请参阅 StandardButton .
构造空的水平按钮框采用给定 parent .
另请参阅 orientation and addButton ().
构造空按钮框采用给定 orientation and parent .
另请参阅 orientation and addButton ().
构造水平按钮框采用给定 parent ，包含的标准按钮指定通过 buttons .
该函数在 Qt 5.2 引入。
另请参阅 orientation and addButton ().
构造按钮框采用给定 orientation and parent ，包含的标准按钮指定通过 buttons .
另请参阅 orientation and addButton ().
[虚拟]
QDialogButtonBox::
~QDialogButtonBox
()
销毁按钮框。
[signal]
void
QDialogButtonBox::
accepted
()
此信号被发射当点击按钮框内按钮时，只要它的定义是采用 AcceptRole or YesRole .
另请参阅 rejected (), clicked ()，和 helpRequested ().
添加给定 button to the button box with the specified role . If the role is invalid, the button is not added.
If the button has already been added, it is removed and added again with the new role.
注意： The button box takes ownership of the button.
另请参阅 removeButton () 和 clear ().
Creates a push button with the given text , adds it to the button box for the specified role , and returns the corresponding push button. If role is invalid, no button is created, and zero is returned.
另请参阅 removeButton () 和 clear ().
添加标准 button to the button box if it is valid to do so, and returns a push button. If button is invalid, it is not added to the button box, and zero is returned.
另请参阅 removeButton () 和 clear ().
返回 QPushButton 对应标准按钮 which , or 0 if the standard button doesn't exist in this button box.
另请参阅 standardButton (), standardButtons ()，和 buttons ().
Returns the button role for the specified button 。此函数返回 InvalidRole if button is 0 or has not been added to the button box.
另请参阅 buttons () 和 addButton ().
Returns a list of all the buttons that have been added to the button box.
另请参阅 buttonRole (), addButton ()，和 removeButton ().
[override virtual protected]
void
QDialogButtonBox::
changeEvent
(
QEvent
*
event
)
重实现自 QWidget::changeEvent ().
Clears the button box, deleting all buttons within it.
另请参阅 removeButton () 和 addButton ().
[signal]
void
QDialogButtonBox::
clicked
(
QAbstractButton
*
button
)
This signal is emitted when a button inside the button box is clicked. The specific button that was pressed is specified by button .
另请参阅 accepted (), rejected ()，和 helpRequested ().
[override virtual protected]
bool
QDialogButtonBox::
event
(
QEvent
*
event
)
重实现自 QWidget::event ().
[signal]
void
QDialogButtonBox::
helpRequested
()
此信号被发射当点击按钮框内按钮时，只要它的定义是采用 HelpRole .
另请参阅 accepted (), rejected ()，和 clicked ().
[signal]
void
QDialogButtonBox::
rejected
()
此信号被发射当点击按钮框内按钮时，只要它的定义是采用 RejectRole or NoRole .
另请参阅 accepted (), helpRequested ()，和 clicked ().
移除 button from the button box without deleting it and sets its parent to zero.
另请参阅 clear (), buttons ()，和 addButton ().
返回的标准按钮枚举值对应给定 button ，或 NoButton 若给定 button 不是标准按钮。
另请参阅 button (), buttons ()，和 standardButtons ().