Qt:Документация 4.3.2/qsizepolicy
Материал из Wiki.crossplatform.ru
| Внимание: Актуальная версия перевода документации находится здесь |
__NOTOC__
|
Главная · Все классы · Основные классы · Классы по группам · Модули · Функции |
[править] QSizePolicy Class Reference
[модуль QtGui ]
The QSizePolicy class is a layout attribute describing horizontal and vertical resizing policy. Далее...
#include <QSizePolicy>[править] Открытые типы
- enum ControlType { DefaultType, ButtonBox, CheckBox, ComboBox, ..., ToolButton }
- flags ControlTypes
- enum Policy { Fixed, Minimum, Maximum, Preferred, ..., Ignored }
- enum PolicyFlag { GrowFlag, ExpandFlag, ShrinkFlag, IgnoreFlag }
[править] Открытые функции
- QSizePolicy ()
- QSizePolicy ( Policy horizontal, Policy vertical )
- QSizePolicy ( Policy horizontal, Policy vertical, ControlType type )
- ControlType controlType () const
- Qt::Orientations expandingDirections () const
- bool hasHeightForWidth () const
- Policy horizontalPolicy () const
- int horizontalStretch () const
- void setControlType ( ControlType type )
- void setHeightForWidth ( bool dependent )
- void setHorizontalPolicy ( Policy policy )
- void setHorizontalStretch ( uchar stretchFactor )
- void setVerticalPolicy ( Policy policy )
- void setVerticalStretch ( uchar stretchFactor )
- void transpose ()
- Policy verticalPolicy () const
- int verticalStretch () const
- operator QVariant () const
- bool operator!= ( const QSizePolicy & other ) const
- bool operator== ( const QSizePolicy & other ) const
[править] Связанные не-члены
- QDataStream & operator<< ( QDataStream & stream, const QSizePolicy & policy )
- QDataStream & operator>> ( QDataStream & stream, QSizePolicy & policy )
[править] Подробное описание
The QSizePolicy class is a layout attribute describing horizontal and vertical resizing policy.
The size policy of a widget is an expression of its willingness to be resized in various ways, and affects how the widget is treated by the layout engine. Widgets that reimplement QWidget::sizePolicy() return a QSizePolicy that describes the horizontal and vertical resizing policy they prefer when being laid out.
QSizePolicy contains two independent QSizePolicy::Policy values and two stretch factors; one describes the widgets's horizontal size policy, and the other describes its vertical size policy. It also contains a flag to indicate whether the height and width of its preferred size are related.
The horizontal and vertical policies can be set in the constructor, and altered using the setHorizontalPolicy() and setVerticalPolicy() functions. The stretch factors can be set using the setHorizontalStretch() and setVerticalStretch() functions. The flag indicating whether the widget's sizeHint() is width-dependent (such as a menu bar or a word-wrapping label) can be set using the setHeightForWidth() function.
The current size policies and stretch factors be retrieved using the horizontalPolicy(), verticalPolicy(), horizontalStretch() and verticalStretch() functions. Alternatively, use the transpose() function to swap the horizontal and vertical policies and stretches. The hasHeightForWidth() function returns the current status of the flag indicating the size hint dependencies.
Use the expandingDirections() function to determine whether the associated widget can make use of more space than its sizeHint() function indicates, as well as find out in which directions it can expand.
Finally, the QSizePolicy class provides operators comparing this size policy to a given policy, as well as a QVariant operator storing this QSizePolicy as a QVariant object.
See also QSize, QWidget::sizeHint(), QWidget::sizePolicy(), and QLayoutItem::sizeHint().
[править] Описание типов
[править] enum QSizePolicy::ControlType
flags QSizePolicy::ControlTypes
This enum specifies the different types of widgets in terms of layout interaction:
| Константа | Значение | Описание |
|---|---|---|
| QSizePolicy::DefaultType | 0x00000001 | The default type, when none is specified. |
| QSizePolicy::ButtonBox | 0x00000002 | A QDialogButtonBox instance. |
| QSizePolicy::CheckBox | 0x00000004 | A QCheckBox instance. |
| QSizePolicy::ComboBox | 0x00000008 | A QComboBox instance. |
| QSizePolicy::Frame | 0x00000010 | A QFrame instance. |
| QSizePolicy::GroupBox | 0x00000020 | A QGroupBox instance. |
| QSizePolicy::Label | 0x00000040 | A QLabel instance. |
| QSizePolicy::Line | 0x00000080 | A QFrame instance with QFrame::HLine or QFrame::VLine. |
| QSizePolicy::LineEdit | 0x00000100 | A QLineEdit instance. |
| QSizePolicy::PushButton | 0x00000200 | A QPushButton instance. |
| QSizePolicy::RadioButton | 0x00000400 | A QRadioButton instance. |
| QSizePolicy::Slider | 0x00000800 | A QAbstractSlider instance. |
| QSizePolicy::SpinBox | 0x00001000 | A QAbstractSpinBox instance. |
| QSizePolicy::TabWidget | 0x00002000 | A QTabWidget instance. |
| QSizePolicy::ToolButton | 0x00004000 | A QToolButton instance. |
Данное перечисление было введено в Qt 4.3.
The ControlTypes type is a typedef for QFlags<ControlType>. It stores an OR combination of ControlType values.
See also setControlType() and controlType().
[править] enum QSizePolicy::Policy
This enum describes the various per-dimension sizing types used when constructing a QSizePolicy.
| Константа | Значение | Описание |
|---|---|---|
| QSizePolicy::Fixed | 0 | The QWidget::sizeHint() is the only acceptable alternative, so the widget can never grow or shrink (e.g. the vertical direction of a push button). |
| QSizePolicy::Minimum | GrowFlag | The sizeHint() is minimal, and sufficient. The widget can be expanded, but there is no advantage to it being larger (e.g. the horizontal direction of a push button). It cannot be smaller than the size provided by sizeHint(). |
| QSizePolicy::Maximum | ShrinkFlag | The sizeHint() is a maximum. The widget can be shrunk any amount without detriment if other widgets need the space (e.g. a separator line). It cannot be larger than the size provided by sizeHint(). |
| QSizePolicy::Preferred | GrowFlag | ShrinkFlag | The sizeHint() is best, but the widget can be shrunk and still be useful. The widget can be expanded, but there is no advantage to it being larger than sizeHint() (the default QWidget policy). |
| QSizePolicy::Expanding | GrowFlag | ShrinkFlag | ExpandFlag | The sizeHint() is a sensible size, but the widget can be shrunk and still be useful. The widget can make use of extra space, so it should get as much space as possible (e.g. the horizontal direction of a horizontal slider). |
| QSizePolicy::MinimumExpanding | GrowFlag | ExpandFlag | The sizeHint() is minimal, and sufficient. The widget can make use of extra space, so it should get as much space as possible (e.g. the horizontal direction of a horizontal slider). |
| QSizePolicy::Ignored | ShrinkFlag | GrowFlag | IgnoreFlag | The sizeHint() is ignored. The widget will get as much space as possible. |
See also PolicyFlag, setHorizontalPolicy(), and setVerticalPolicy().
[править] enum QSizePolicy::PolicyFlag
These flags are combined together to form the various Policy values:
| Константа | Значение | Описание |
|---|---|---|
| QSizePolicy::GrowFlag | 1 | The widget can grow beyond its size hint if necessary. |
| QSizePolicy::ExpandFlag | 2 | The widget should get as much space as possible. |
| QSizePolicy::ShrinkFlag | 4 | The widget can shrink below its size hint if necessary. |
| QSizePolicy::IgnoreFlag | 8 | The widget's size hint is ignored. The widget will get as much space as possible. |
See also Policy.
[править] Описание функций-членов
[править] QSizePolicy::QSizePolicy ()
Constructs a QSizePolicy object with Fixed as its horizontal and vertical policies.
The policies can be altered using the setHorizontalPolicy() and setVerticalPolicy() functions. Use the setHeightForWidth() function if the preferred height of the widget is dependent on the width of the widget (for example, a QLabel with line wrapping).
See also setHorizontalStretch() and setVerticalStretch().
[править] QSizePolicy::QSizePolicy ( Policy horizontal, Policy vertical )
Constructs a QSizePolicy object with the given horizontal and vertical policies, and DefaultType as the control type.
Use setHeightForWidth() if the preferred height of the widget is dependent on the width of the widget (for example, a QLabel with line wrapping).
See also setHorizontalStretch() and setVerticalStretch().
[править] QSizePolicy::QSizePolicy ( Policy horizontal, Policy vertical, ControlType type )
Constructs a QSizePolicy object with the given horizontal and vertical policies, and the specified control type.
Use setHeightForWidth() if the preferred height of the widget is dependent on the width of the widget (for example, a QLabel with line wrapping).
Эта функция была введена в Qt 4.3.
See also setHorizontalStretch(), setVerticalStretch(), and controlType().
[править] ControlType QSizePolicy::controlType () const
Returns the control type associated with the widget for which this size policy applies.
Эта функция была введена в Qt 4.3.
See also setControlType().
[править] Qt::Orientations QSizePolicy::expandingDirections () const
Returns whether a widget can make use of more space than the QWidget::sizeHint() function indicates.
A value of Qt::Horizontal or Qt::Vertical means that the widget can grow horizontally or vertically (i.e., the horizontal or vertical policy is Expanding or MinimumExpanding), whereas Qt::Horizontal | Qt::Vertical means that it can grow in both dimensions.
See also horizontalPolicy() and verticalPolicy().
[править] bool QSizePolicy::hasHeightForWidth () const
Returns true if the widget's preferred height depends on its width; otherwise returns false.
See also setHeightForWidth().
[править] Policy QSizePolicy::horizontalPolicy () const
Returns the horizontal component of the size policy.
See also setHorizontalPolicy(), verticalPolicy(), and horizontalStretch().
[править] int QSizePolicy::horizontalStretch () const
Returns the horizontal stretch factor of the size policy.
See also setHorizontalStretch(), verticalStretch(), and horizontalPolicy().
[править] void QSizePolicy::setControlType ( ControlType type )
Sets the control type associated with the widget for which this size policy applies to type.
The control type specifies the type of the widget for which this size policy applies. It is used by some styles, notably QMacStyle, to insert proper spacing between widgets. For example, the Mac OS X Aqua guidelines specify that push buttons should be separated by 12 pixels, whereas vertically stacked radio buttons only require 6 pixels.
Эта функция была введена в Qt 4.3.
See also controlType() and QStyle::layoutSpacing().
[править] void QSizePolicy::setHeightForWidth ( bool dependent )
Sets the flag determining whether the widget's preferred height depends on its width, to dependent.
See also hasHeightForWidth().
[править] void QSizePolicy::setHorizontalPolicy ( Policy policy )
Sets the horizontal component to the given policy.
See also horizontalPolicy(), setVerticalPolicy(), and setHorizontalStretch().
[править] void QSizePolicy::setHorizontalStretch ( uchar stretchFactor )
Sets the horizontal stretch factor of the size policy to the given stretchFactor.
See also horizontalStretch(), setVerticalStretch(), and setHorizontalPolicy().
[править] void QSizePolicy::setVerticalPolicy ( Policy policy )
Sets the vertical component to the given policy.
See also verticalPolicy(), setHorizontalPolicy(), and setVerticalStretch().
[править] void QSizePolicy::setVerticalStretch ( uchar stretchFactor )
Sets the vertical stretch factor of the size policy to the given stretchFactor.
See also verticalStretch(), setHorizontalStretch(), and setVerticalPolicy().
[править] void QSizePolicy::transpose ()
Swaps the horizontal and vertical policies and stretches.
[править] Policy QSizePolicy::verticalPolicy () const
Returns the vertical component of the size policy.
See also setVerticalPolicy(), horizontalPolicy(), and verticalStretch().
[править] int QSizePolicy::verticalStretch () const
Returns the vertical stretch factor of the size policy.
See also setVerticalStretch(), horizontalStretch(), and verticalPolicy().
[править] QSizePolicy::operator QVariant () const
Returns a QVariant storing this QSizePolicy.
[править] bool QSizePolicy::operator!= ( const QSizePolicy & other ) const
Returns true if this policy is different from other; otherwise returns false.
Смотрите также operator==().
[править] bool QSizePolicy::operator== ( const QSizePolicy & other ) const
Returns true if this policy is equal to other; otherwise returns false.
Смотирте также operator!=().
[править] Связанные не-члены
[править] QDataStream & operator<< ( QDataStream & stream, const QSizePolicy & policy )
Эта перегруженная функция предоставлена для удобства.
Writes the size policy to the data stream stream.
Эта функция была введена в Qt 4.2.
See also Format of the QDataStream operators.
[править] QDataStream & operator>> ( QDataStream & stream, QSizePolicy & policy )
Эта перегруженная функция предоставлена для удобства.
Reads the size policy from the data stream stream.
Эта функция была введена в Qt 4.2.
See also Format of the QDataStream operators.
| Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
|
