Qt 名称空间

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enum Qt:: AlignmentFlag
flags Qt:: Alignment

This enum type is used to describe alignment. It contains horizontal and vertical flags that can be combined to produce the required effect.

TextElideMode enum can also be used in many situations to fine-tune the appearance of aligned text.

水平标志：

垂直标志：

You can use only one of the horizontal flags at a time. There is one two-dimensional flag:

You can use at most one horizontal and one vertical flag at a time. Qt::AlignCenter counts as both horizontal and vertical.

Three enum values are useful in applications that can be run in right-to-left mode:

Masks:

Conflicting combinations of flags have undefined meanings.

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

enum Qt:: AnchorPoint

Specifies a side of a layout item that can be anchored. This is used by QGraphicsAnchorLayout .

另请参阅 QGraphicsAnchorLayout .

enum Qt:: ApplicationAttribute

This enum describes attributes that change the behavior of application-wide features. These are enabled and disabled using QCoreApplication::setAttribute (), and can be tested for with QCoreApplication::testAttribute ().

The following values are deprecated or obsolete:

enum Qt:: ApplicationState
flags Qt:: ApplicationStates

This enum type is used to specify the current state of the application.

The states are

This enum was introduced or modified in Qt 5.1.

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

enum Qt:: ArrowType

enum Qt:: AspectRatioMode

This enum type defines what happens to the aspect ratio when scaling an rectangle.

另请参阅 QSize::scale () 和 QImage::scaled ().

enum Qt:: Axis

This enum type defines three values to represent the three axes in the cartesian coordinate system.

另请参阅 QTransform::rotate () 和 QTransform::rotateRadians ().

enum Qt:: BGMode

背景模式：

enum Qt:: BrushStyle

This enum type defines the brush styles supported by Qt, i.e. the fill pattern of shapes drawn using QPainter .

另请参阅 QBrush .

enum Qt:: CaseSensitivity

enum Qt:: CheckState

此枚举描述可复选项、控件及 Widget 的状态。

另请参阅 QCheckBox , Qt::ItemFlags ，和 Qt::ItemDataRole .

enum Qt:: ChecksumType

This enum describes the possible standards used by qChecksum ().

This enum was introduced or modified in Qt 5.9.

enum Qt:: ClipOperation

enum Qt:: ConnectionType

此枚举描述可以用于信号和槽之间的连接类型。尤其，它确定是把特定信号立即交付给槽，还是在以后队列交付。

采用队列连接，参数类型必须是 Qt 元对象系统知道的，因为 Qt 需要拷贝自变量以存储它们在幕后事件中。若试着队列排队连接并获得错误消息：

QObject::connect: Cannot queue arguments of type 'MyType'
							

调用 qRegisterMetaType () 以注册数据类型在建立连接之前。

当使用信号和槽采用多个线程时，见 信号和槽跨线程 .

另请参阅 Qt 中的线程支持 , QObject::connect (), qRegisterMetaType ()，和 Q_DECLARE_METATYPE ().

enum Qt:: ContextMenuPolicy

此枚举类型定义 Widget 在展示上下文菜单方面可以采用的各种策略。

enum Qt:: CoordinateSystem

此枚举指定坐标系统。

This enum was introduced or modified in Qt 4.6.

enum Qt:: Corner

此枚举类型指定矩形角落：

enum Qt:: CursorMoveStyle

此枚举描述文本光标的可用移动样式。选项：

enum Qt:: CursorShape

此枚举类型定义可以使用的各种光标。

标准箭头光标是处于正常状态的 Widget 的默认值。

常量	值	描述
Qt::ArrowCursor	0	标准箭头光标。
Qt::UpArrowCursor	1	向上指向屏幕顶部的箭头。
Qt::CrossCursor	2	A crosshair cursor, typically used to help the user accurately select a point on the screen.
Qt::WaitCursor	3	An hourglass or watch cursor, usually shown during operations that prevent the user from interacting with the application.
Qt::IBeamCursor	4	^ 插入符号或 ibeam 光标，指示 Widget 可以接受和显示文本输入。
Qt::SizeVerCursor	5	A cursor used for elements that are used to vertically resize top-level windows.
Qt::SizeHorCursor	6	A cursor used for elements that are used to horizontally resize top-level windows.
Qt::SizeBDiagCursor	7	A cursor used for elements that are used to diagonally resize top-level windows at their top-right and bottom-left corners.
Qt::SizeFDiagCursor	8	A cursor used for elements that are used to diagonally resize top-level windows at their top-left and bottom-right corners.
Qt::SizeAllCursor	9	A cursor used for elements that are used to resize top-level windows in any direction.
Qt::BlankCursor	10	A blank/invisible cursor, typically used when the cursor shape needs to be hidden.
Qt::SplitVCursor	11	A cursor used for vertical splitters, indicating that a handle can be dragged horizontally to adjust the use of available space.
Qt::SplitHCursor	12	A cursor used for horizontal splitters, indicating that a handle can be dragged vertically to adjust the use of available space.
Qt::PointingHandCursor	13	A pointing hand cursor that is typically used for clickable elements such as hyperlinks.
Qt::ForbiddenCursor	14	A slashed circle cursor, typically used during drag and drop operations to indicate that dragged content cannot be dropped on particular widgets or inside certain regions.
Qt::OpenHandCursor	17	A cursor representing an open hand, typically used to indicate that the area under the cursor is the visible part of a canvas that the user can click and drag in order to scroll around.
Qt::ClosedHandCursor	18	A cursor representing a closed hand, typically used to indicate that a dragging operation is in progress that involves scrolling.
Qt::WhatsThisCursor	15	An arrow with a question mark, typically used to indicate the presence of What's This? help for a widget.
Qt::BusyCursor	16	An hourglass or watch cursor, usually shown during operations that allow the user to interact with the application while they are performed in the background.
Qt::DragMoveCursor	20	通常使用的光标当拖曳项时。
Qt::DragCopyCursor	19	A cursor that is usually used when dragging an item to copy it.
Qt::DragLinkCursor	21	A cursor that is usually used when dragging an item to make a link to it.
Qt::BitmapCursor	24

enum Qt:: DateFormat

注意： For ISODate formats, each Y , M and D represents a single digit of the year, month and day used to specify the date. Each H , M and S represents a single digit of the hour, minute and second used to specify the time. The presence of a literal T character is used to separate the date and time when both are specified.

enum Qt:: DayOfWeek

enum Qt:: DockWidgetArea
flags Qt:: DockWidgetAreas

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

enum Qt:: DropAction
flags Qt:: DropActions

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

enum Qt:: Edge
flags Qt:: Edges

This enum type specifies an edge in a rectangle:

This enum was introduced or modified in Qt 5.1.

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

enum Qt:: EnterKeyType

This can be used to alter the appearance of the Return key on an on-screen keyboard.

注意： Not all of these values are supported on all platforms. For unsupported values the default key will be used instead.

This enum was introduced or modified in Qt 5.6.

enum Qt:: EventPriority

This enum can be used to specify event priorities.

Note that these values are provided purely for convenience, since event priorities can be any value between INT_MAX and INT_MIN , inclusive. For example, you can define custom priorities as being relative to each other:

enum CustomEventPriority
{
    // An important event
    ImportantEventPriority = Qt::HighEventPriority,
    // A more important event
    MoreImportantEventPriority = ImportantEventPriority + 1,
    // A critical event
    CriticalEventPriority = 100 * MoreImportantEventPriority,
    // Not that important
    StatusEventPriority = Qt::LowEventPriority,
    // These are less important than Status events
    IdleProcessingDoneEventPriority = StatusEventPriority - 1
};
							

另请参阅 QCoreApplication::postEvent ().

enum Qt:: FillRule

Specifies which method should be used to fill the paths and polygons.

enum Qt:: FindChildOption
flags Qt:: FindChildOptions

FindChildOptions 类型是 typedef 对于 QFlags <FindChildOption>. It stores an OR combination of FindChildOption values.

enum Qt:: FocusPolicy

此枚举类型定义 Widget 在获得键盘聚焦方面可以拥有的各种策略。

enum Qt:: FocusReason

此枚举指定聚焦为什么改变。它会被传递透过 QWidget::setFocus 且可以检索在 QFocusEvent 被发送给 Widget 当聚焦改变时。

另请参阅 Widget 中的键盘焦点 .

enum Qt:: GestureFlag
flags Qt:: GestureFlags

此枚举类型描述可以使用的额外标志，当订阅手势时。

This enum was introduced or modified in Qt 4.6.

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

另请参阅 QWidget::grabGesture () 和 QGraphicsObject::grabGesture ().

enum Qt:: GestureState

此枚举类型描述手势的状态。

This enum was introduced or modified in Qt 4.6.

另请参阅 QGesture .

enum Qt:: GestureType

此枚举类型描述标准手势。

注册用户定义手势采用 QGestureRecognizer::registerRecognizer () 函数，其生成带 Qt::CustomGesture 设置标志的自定义手势 ID。

This enum was introduced or modified in Qt 4.6.

另请参阅 QGesture , QWidget::grabGesture ()，和 QGraphicsObject::grabGesture ().

enum Qt:: GlobalColor

Qt 的预定义 QColor 对象：

另请参阅 QColor .

typedef Qt:: HANDLE

A handle type for system objects, defined as void * on all platforms.

enum Qt:: HitTestAccuracy

This enum contains the types of accuracy that can be used by the QTextDocument class when testing for mouse clicks on text documents.

enum Qt:: ImageConversionFlag
flags Qt:: ImageConversionFlags

The options marked "(default)" are set if no other values from the list are included (since the defaults are zero):

Color/Mono preference (ignored for QBitmap ):

Dithering mode preference:

Dithering mode preference for 1-bit alpha masks:

Color matching versus dithering preference:

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

enum Qt:: InputMethodHint
flags Qt:: InputMethodHints

Flags that alter the behavior:

Flags that restrict input (exclusive flags):

Masks:

注意： If several exclusive flags are OR-ed together, the resulting character set will consist of the union of the specified sets. For instance specifying ImhNumbersOnly and ImhUppercaseOnly would yield a set consisting of numbers and uppercase letters.

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

另请参阅 QGraphicsItem::inputMethodHints ().

enum Qt:: InputMethodQuery
flags Qt:: InputMethodQueries

Masks:

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

另请参阅 QInputMethodQueryEvent .

enum Qt:: ItemDataRole

模型中每项拥有一组与之关联的数据元素，每数据元素带有其自己的角色。视图使用角色来指示模型，其需要哪种数据类型。自定义模型应该返回这些类型的数据。

一般用途的角色 (和关联的类型)：

描述外观和元数据的角色 (与关联类型)：

可访问性角色 (与关联类型)：

用户角色：

对于用户角色，由开发者决定要使用哪种类型，并确保组件使用正确类型，当访问和设置数据时。

enum Qt:: ItemFlag
flags Qt:: ItemFlags

此枚举描述项的特性：

Note that checkable items need to be given both a suitable set of flags and an initial state, indicating whether the item is checked or not. This is handled automatically for model/view components, but needs to be explicitly set for instances of QListWidgetItem , QTableWidgetItem ，和 QTreeWidgetItem .

Note that it is undefined behavior to reimplement QAbstractItemModel::hasChildren to return true for an index if that index has the Qt::ItemNeverHasChildren flag set.

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

另请参阅 QAbstractItemModel .

enum Qt:: ItemSelectionMode

This enum is used in QGraphicsItem , QGraphicsScene and QGraphicsView to specify how items are selected, or how to determine if shapes and items collide.

另请参阅 QGraphicsScene::items (), QGraphicsScene::collidingItems (), QGraphicsView::items (), QGraphicsItem::collidesWithItem ()，和 QGraphicsItem::collidesWithPath ().

enum Qt:: ItemSelectionOperation

This enum is used in QGraphicsScene to specify what to do with currently selected items when setting a selection area.

另请参阅 QGraphicsScene::setSelectionArea ().

enum Qt:: Key

The key names used by Qt.

另请参阅 QKeyEvent::key ().

enum Qt:: KeyboardModifier
flags Qt:: KeyboardModifiers

此枚举描述修饰符键。

注意： On macOS ， ControlModifier value corresponds to the Command keys on the keyboard, and the MetaModifier value corresponds to the Control keys. The KeypadModifier value will also be set when an arrow key is pressed as the arrow keys are considered part of the keypad.

注意： On Windows Keyboards, Qt::MetaModifier and Qt::Key_Meta are mapped to the Windows key.

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

另请参阅 MouseButton and Modifier .

enum Qt:: LayoutDirection

指定 Qt 布局和文本处理的方向。

Right-to-left layouts are necessary for certain languages, notably Arabic and Hebrew.

LayoutDirectionAuto serves two purposes. When used in conjunction with widgets and layouts, it will imply to use the layout direction set on the parent widget or QApplication . This has the same effect as QWidget::unsetLayoutDirection ().

When LayoutDirectionAuto is used in conjunction with text layouting, it will imply that the text directionality is determined from the content of the string to be layouted.

另请参阅 QGuiApplication::setLayoutDirection (), QWidget::setLayoutDirection (), QTextOption::setTextDirection ()，和 QString::isRightToLeft ().

enum Qt:: MaskMode

This enum specifies the behavior of the QPixmap::createMaskFromColor () 和 QImage::createMaskFromColor () 函数。

enum Qt:: MatchFlag
flags Qt:: MatchFlags

This enum describes the type of matches that can be used when searching for items in a model.

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

另请参阅 QString::compare () 和 QRegExp .

enum Qt:: Modifier

This enum provides shorter names for the keyboard modifier keys supported by Qt.

注意： On macOS ， CTRL value corresponds to the Command keys on the keyboard, and the META value corresponds to the Control keys.

另请参阅 KeyboardModifier and MouseButton .

enum Qt:: MouseButton
flags Qt:: MouseButtons

This enum type describes the different mouse buttons.

注意： Some models of multi-button mice are pre-configured with high-numbered Buttons emulating keyboard sequences, for use in specific games. In order for these Buttons to be seen as actual 'Mouse Buttons', the device must be re-configured (using the vendor's configuration tool).

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

另请参阅 KeyboardModifier and Modifier .

enum Qt:: MouseEventFlag
flags Qt:: MouseEventFlags

This enum provides additional information concerning a QMouseEvent .

This enum was introduced or modified in Qt 5.3.

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

enum Qt:: MouseEventSource

此枚举描述鼠标事件的来源，且可以用于确定事件是否是源自其它设备 (如触摸屏) 的人工鼠标事件。

This enum was introduced or modified in Qt 5.3.

另请参阅 Qt::AA_SynthesizeMouseForUnhandledTouchEvents .

enum Qt:: NativeGestureType

此枚举返回手势类型。

This enum was introduced or modified in Qt 5.2.

enum Qt:: NavigationMode

此枚举类型描述移动聚焦的模式。

注意： Cursor navigation is not currently implemented on any platform and behaves as NavigationModeNone.

This enum was introduced or modified in Qt 4.6.

另请参阅 QApplication::setNavigationMode () 和 QApplication::navigationMode ().

enum Qt:: Orientation
flags Qt:: Orientations

此类型用于表示对象的取向。

取向被用于 QScrollBar 例如。

取向类型是 typedef 对于 QFlags <Orientation>。它存储 Orientation 值的 OR 组合。

enum Qt:: PenCapStyle

This enum type defines the pen cap styles supported by Qt, i.e. the line end caps that can be drawn using QPainter .

Qt::SquareCap	Qt::FlatCap	Qt::RoundCap

另请参阅 QPen .

enum Qt:: PenJoinStyle

This enum type defines the pen join styles supported by Qt, i.e. which joins between two connected lines can be drawn using QPainter .

Qt::BevelJoin	Qt::MiterJoin	Qt::RoundJoin

另请参阅 QPen .

enum Qt:: PenStyle

This enum type defines the pen styles that can be drawn using QPainter . The styles are:

Qt::SolidLine	Qt::DashLine	Qt::DotLine
Qt::DashDotLine	Qt::DashDotDotLine	Qt::CustomDashLine

另请参阅 QPen .

enum Qt:: ScreenOrientation
flags Qt:: ScreenOrientations

This enum type specifies the various orientations a screen might have.

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

enum Qt:: ScrollBarPolicy

This enum type describes the various modes of QAbstractScrollArea 's scroll bars.

(The modes for the horizontal and vertical scroll bars are independent.)

enum Qt:: ScrollPhase

此枚举描述卷动的相位。

This enum was introduced or modified in Qt 5.2.

enum Qt:: ShortcutContext

对于要发生的 QEvent::Shortcut 事件，快捷方式的键序列必须由用户在快捷方式活动的上下文中键入。可能的上下文：

enum Qt:: SizeHint

此枚举用于 QGraphicsLayoutItem::sizeHint ()

This enum was introduced or modified in Qt 4.4.

另请参阅 QGraphicsLayoutItem::sizeHint ().

enum Qt:: SizeMode

此枚举用于 QPainter::drawRoundedRect () 和 QPainterPath::addRoundedRect () functions to specify the radii of rectangle corners with respect to the dimensions of the bounding rectangles specified.

This enum was introduced or modified in Qt 4.4.

enum Qt:: SortOrder

此枚举描述如何排序 Widget 中的项是的。

enum Qt:: TabFocusBehavior

This enum type provides different focus behaviors for tab navigation.