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QtGui.QLayoutItem Class Reference

The QLayoutItem class provides an abstract item that a QLayout manipulates. More...

Inheritance diagram for QtGui.QLayoutItem:
Collaboration diagram for QtGui.QLayoutItem:

Public Member Functions

 QLayoutItem (IQLayoutItem copy)
 
 QLayoutItem (Qt.AlignmentFlag alignment=0)
 
 
virtual void CreateProxy ()
 
virtual int HeightForWidth (int w)
 
 
virtual void Invalidate ()
 
 
virtual int MinimumHeightForWidth (int w)
 
 
new void Dispose ()
 
- Public Member Functions inherited from QtGui.IQLayoutItem
int HeightForWidth (int w)
 
 
void Invalidate ()
 
 
int MinimumHeightForWidth (int w)
 
 

Protected Member Functions

 QLayoutItem (System.Type dummy)
 

Protected Attributes

SmokeInvocation interceptor
 

Properties

Qt.AlignmentFlag Alignment [get, set]
 
 
virtual QRect Geometry [get, set]
 
 
QSizePolicy.ControlType ControlTypes [get]
 
 
virtual Qt.Orientation ExpandingDirections [get]
 
 
virtual bool HasHeightForWidth [get]
 
 
virtual bool IsEmpty [get]
 
 
virtual QLayout Layout [get]
 
 
virtual QSize MaximumSize [get]
 
 
virtual QSize MinimumSize [get]
 
 
virtual QSize SizeHint [get]
 
 
virtual QSpacerItem SpacerItem [get]
 
 
virtual QWidget Widget [get]
 
 
virtual System.IntPtr SmokeObject [get, set]
 
new Qt.AlignmentFlag Align [get, set]
 
- Properties inherited from QtGui.IQLayoutItem
Qt.AlignmentFlag Alignment [get, set]
 
 
QRect Geometry [get, set]
 
 
QSizePolicy.ControlType ControlTypes [get]
 
 
Qt.Orientation ExpandingDirections [get]
 
 
System.Boolean HasHeightForWidth [get]
 
 
System.Boolean IsEmpty [get]
 
 
QLayout Layout [get]
 
 
QSize MaximumSize [get]
 
 
QSize MinimumSize [get]
 
 
QSize SizeHint [get]
 
 
QSpacerItem SpacerItem [get]
 
 
QWidget Widget [get]
 
 

Detailed Description

The QLayoutItem class provides an abstract item that a QLayout manipulates.

This is used by custom layouts.

Pure virtual functions are provided to return information about the layout, including, sizeHint(), minimumSize(), maximumSize() and expanding().

The layout's geometry can be set and retrieved with setGeometry() and geometry(), and its alignment with setAlignment() and alignment().

isEmpty() returns whether the layout item is empty. If the concrete item is a QWidget, it can be retrieved using widget(). Similarly for layout() and spacerItem().

Some layouts have width and height interdependencies. These can be expressed using hasHeightForWidth(), heightForWidth(), and minimumHeightForWidth(). For more explanation see the Qt Quarterly article Trading Height for Width.

See also QLayout.

Constructor & Destructor Documentation

QtGui.QLayoutItem.QLayoutItem ( System.Type  dummy)
protected
QtGui.QLayoutItem.QLayoutItem ( IQLayoutItem  copy)
QtGui.QLayoutItem.QLayoutItem ( Qt.AlignmentFlag  alignment = 0)

Constructs a layout item with an alignment. Not all subclasses support alignment.

Member Function Documentation

virtual void QtGui.QLayoutItem.CreateProxy ( )
virtual
new void QtGui.QLayoutItem.Dispose ( )
virtual int QtGui.QLayoutItem.HeightForWidth ( int  w)
virtual

Returns the preferred height for this layout item, given the width w.

The default implementation returns -1, indicating that the preferred height is independent of the width of the item. Using the function hasHeightForWidth() will typically be much faster than calling this function and testing for -1.

Reimplement this function in layout managers that support height for width. A typical implementation will look like this:

int MyLayout::heightForWidth(int w) const

{

if (cache_dirty || cached_width != w) {

// not all C++ compilers support "mutable"

MyLayout that = (MyLayout)this;

int h = calculateHeightForWidth(w);

that->cached_hfw = h;

return h;

}

return cached_hfw;

}

Caching is strongly recommended; without it layout will take exponential time.

See also hasHeightForWidth().

Reimplemented in QtGui.QWidgetItemV2, and QtGui.QWidgetItem.

virtual void QtGui.QLayoutItem.Invalidate ( )
virtual

Invalidates any cached information in this layout item.

virtual int QtGui.QLayoutItem.MinimumHeightForWidth ( int  w)
virtual

Returns the minimum height this widget needs for the given width, w. The default implementation simply returns heightForWidth(w).

Member Data Documentation

SmokeInvocation QtGui.QLayoutItem.interceptor
protected

Property Documentation

new Qt.AlignmentFlag QtGui.QLayoutItem.Align
getsetprotected
Qt.AlignmentFlag QtGui.QLayoutItem.Alignment
getset

Returns the alignment of this item.

Sets the alignment of this item to alignment.

Note: Item alignment is only supported by QLayoutItem subclasses where it would have a visual effect. Except for QSpacerItem, which provides blank space for layouts, all public Qt classes that inherit QLayoutItem support item alignment.

QSizePolicy.ControlType QtGui.QLayoutItem.ControlTypes
get

Returns the control type(s) for the layout item. For a QWidgetItem, the control type comes from the widget's size policy; for a QLayoutItem, the control types is derived from the layout's contents.

See also QSizePolicy::controlType().

virtual Qt.Orientation QtGui.QLayoutItem.ExpandingDirections
get

Returns whether this layout item can make use of more space than sizeHint(). A value of Qt::Vertical or Qt::Horizontal means that it wants to grow in only one dimension, whereas Qt::Vertical | Qt::Horizontal means that it wants to grow in both dimensions.

virtual QRect QtGui.QLayoutItem.Geometry
getset

Returns the rectangle covered by this layout item.

Implemented in subclasses to set this item's geometry to r.

virtual bool QtGui.QLayoutItem.HasHeightForWidth
get

Returns true if this layout's preferred height depends on its width; otherwise returns false. The default implementation returns false.

Reimplement this function in layout managers that support height for width.

See also heightForWidth() and QWidget::heightForWidth().

virtual bool QtGui.QLayoutItem.IsEmpty
get

Implemented in subclasses to return whether this item is empty, i.e. whether it contains any widgets.

virtual QLayout QtGui.QLayoutItem.Layout
get

If this item is a QLayout, it is returned as a QLayout; otherwise 0 is returned. This function provides type-safe casting.

virtual QSize QtGui.QLayoutItem.MaximumSize
get

Implemented in subclasses to return the maximum size of this item.

virtual QSize QtGui.QLayoutItem.MinimumSize
get

Implemented in subclasses to return the minimum size of this item.

virtual QSize QtGui.QLayoutItem.SizeHint
get

Implemented in subclasses to return the preferred size of this item.

virtual System.IntPtr QtGui.QLayoutItem.SmokeObject
getset
virtual QSpacerItem QtGui.QLayoutItem.SpacerItem
get

If this item is a QSpacerItem, it is returned as a QSpacerItem; otherwise 0 is returned. This function provides type-safe casting.

virtual QWidget QtGui.QLayoutItem.Widget
get

If this item is a QWidget, it is returned as a QWidget; otherwise 0 is returned. This function provides type-safe casting.