The BGroupLayout class is a simple BLayout subclass that arranges the items it holds within a vertical or horizontal box. More...

Inherits BTwoDimensionalLayout.

Public Member Functions
	BGroupLayout (BMessage *from)
	Archive constructor.

	BGroupLayout (orientation orientation, float spacing=B_USE_DEFAULT_SPACING)
	Creates a new BGroupLayout.

virtual	~BGroupLayout ()
	Destructor method.

virtual bool	AddItem (BLayoutItem *item)
	Adds item to this layout as the last item. In a vertical BGroupLayout, item will be on the right, in a horizontal BGroupLayout, item will be at the bottom.

virtual bool	AddItem (BLayoutItem *item, float weight)
	Adds item to the end of this layout with a weight of weight.

virtual bool	AddItem (int32 index, BLayoutItem *item)
	Adds item to this layout at index.

virtual bool	AddItem (int32 index, BLayoutItem *item, float weight)
	Adds item this layout at index with a weight of weight.

virtual BLayoutItem *	AddView (BView *child)
	Adds child to this layout as the last item. In a vertical BGroupLayout, child will be on the right, in a horizontal BGroupLayout, child will be at the bottom.

virtual BLayoutItem *	AddView (BView *child, float weight)
	Adds child to the end of this layout with a weight of weight.

virtual BLayoutItem *	AddView (int32 index, BView *child)
	Adds child to this layout at index.

virtual BLayoutItem *	AddView (int32 index, BView *child, float weight)
	Adds child this layout at index with a weight of weight.

virtual status_t	Archive (BMessage *into, bool deep=true) const
	Archives this layout into archive. If deep is true, also archives the items in this layout, calling ItemArchived() for each one.

float	ItemWeight (int32 index) const
	Get the weight of the item at index.

orientation	Orientation () const
	Get the orientation of this BGroupLayout.

virtual status_t	Perform (perform_code d, void *arg)
	Perform some action (Internal method defined for binary compatibility purposes).

void	SetItemWeight (int32 index, float weight)
	Set the weight of the item at index.

void	SetOrientation (orientation orientation)
	Set the orientation of this BGroupLayout.

void	SetSpacing (float spacing)
	Set the amount of spacing (in pixels) between each item.

float	Spacing () const
	Get the amount of spacing (in pixels) between each item.

Public Member Functions inherited from BTwoDimensionalLayout
	BTwoDimensionalLayout ()
	Create an empty layout.

	BTwoDimensionalLayout (BMessage *from)
	Unarchive constructor.

virtual	~BTwoDimensionalLayout ()
	Destructor.

void	AlignLayoutWith (BTwoDimensionalLayout *other, orientation orientation)
	Align the BLayoutItem's in the specified orientation within two or more BTwoDimensionalLayout's.

virtual status_t	Archive (BMessage *into, bool deep=true) const
	Archives this layout into archive. If deep is true, also archives the items in this layout, calling ItemArchived() for each one.

virtual BAlignment	BaseAlignment ()
	Method to be implemented in derived classes return the preferred alignment for this BAbstractLayout.

virtual BSize	BaseMaxSize ()
	Method to be implemented in derived classes return the maximum size constraint for this BAbstractLayout.

virtual BSize	BaseMinSize ()
	Method to be implemented in derived classes return the minimum size constraint for this BAbstractLayout.

virtual BSize	BasePreferredSize ()
	Method to be implemented in derived classes return the preferred size constraint for this BAbstractLayout.

virtual void	GetHeightForWidth (float width, float min, float max, float *preferred)
	Get this BLayoutItem's height constraints for a given width.

void	GetInsets (float left, float top, float right, float bottom) const
	Get the insets for the BTwoDimensionalLayout (in pixels).

virtual bool	HasHeightForWidth ()
	Returns whether or not this BLayoutItem's height constraints are dependent on its width.

virtual status_t	Perform (perform_code d, void *arg)
	Perform some action (Internal method defined for binary compatibility purposes).

virtual void	SetFrame (BRect frame)
	Set the bounding frame of this item.

void	SetInsets (float horizontal, float vertical)
	Set the insets for this layout.

void	SetInsets (float insets)
	Set the insets for this layout.

void	SetInsets (float left, float top, float right, float bottom)
	Set the insets for this layout.

Public Member Functions inherited from BAbstractLayout
virtual BAlignment	Alignment ()

virtual status_t	Archive (BMessage *into, bool deep=true) const
	Archives this layout into archive. If deep is true, also archives the items in this layout, calling ItemArchived() for each one.

virtual BRect	Frame ()
	Return the bounding frame of this item.

virtual bool	IsVisible ()
	Return the current local visibility of this item. If an item is not visible, it will not be given space by the BLayout it resides in.

virtual BSize	MaxSize ()

virtual BSize	MinSize ()

virtual status_t	Perform (perform_code d, void *arg)
	Perform some action (Internal method defined for binary compatibility purposes).

virtual BSize	PreferredSize ()

virtual void	SetExplicitAlignment (BAlignment alignment)
	Set this item's explicit alignment, to be used in Alignment().

virtual void	SetExplicitMaxSize (BSize size)
	Set this item's explicit max size, to be used in MaxSize().

virtual void	SetExplicitMinSize (BSize size)
	Set this item's explicit min size, to be used in MinSize().

virtual void	SetExplicitPreferredSize (BSize size)
	Set this item's explicit preferred size, to be used in PreferredSize().

virtual void	SetFrame (BRect frame)
	Set the bounding frame of this item.

virtual void	SetVisible (bool visible)
	Set the local visibility of this item.

	BAbstractLayout ()
	Construct a BAbstractLayout.

	BAbstractLayout (BMessage *from)
	Archive constructor.

Public Member Functions inherited from BLayout
	BLayout ()
	Default constructor.

	BLayout (BMessage *archive)
	Archive constructor.

virtual	~BLayout ()
	Destructor, deletes all BLayoutItem's that this layout manages, and detaches from this BLayout's owner view if there is one.

virtual status_t	Perform (perform_code d, void *arg)
	Perform some action (Internal method defined for binary compatibility purposes).

BView *	Owner () const
	Returns the Owner of this layout, i.e. the view this layout manages.

BView *	TargetView () const
	Returns the target view of this layout.

virtual BView *	View ()
	Returns the same BView* as BLayout::Owner(), this method is inherited from BLayoutItem.

virtual bool	RemoveView (BView *child)
	Removes and deletes all BLayoutItem representing a BView from this layout.

virtual bool	RemoveItem (BLayoutItem *item)
	Removes a BLayoutItem from this layout, and also removes the view it represents from this BLayout's target view.

virtual BLayoutItem *	RemoveItem (int32 index)
	Remove the BLayoutItem at index.

BLayoutItem *	ItemAt (int32 index) const
	Get the BLayoutItem at index. Returns `NULL` if index is out of bounds.

int32	CountItems () const
	Get the number of BLayoutItem s in this layout.

int32	IndexOfItem (const BLayoutItem *item) const
	Get the index of a BLayoutItem in this layout.

int32	IndexOfView (BView *child) const
	Get the index of child in this layout.

virtual void	Relayout (bool immediate=false)
	Request this BLayout to reposition and resize its items as required.

void	LayoutItems (bool force=false)
	If there is no layout currently ongoing, and force is `false`, creates a new BLayoutContext and calls the DoLayout() method of this BLayout and any BLayout's nested in this BLayout.

BLayoutContext *	LayoutContext () const
	Returns the BLayoutContext this BLayout is currently operating in, or `NULL`.

bool	AncestorsVisible () const
	Get the visibility of the ancestors of this layout.

BRect	LayoutArea ()
	Returns the on-screen area this layout has received to lay out its items in.

virtual void	InvalidateLayout (bool children=false)
	Invalidate this layout and any cached data this layout has relating to positioning and sizing of its items.

void	RequireLayout ()
	Flag this layout as stale, i.e. any cached data may still be valid, but the items need to be repositioned or resized.

bool	IsValid ()
	Returns whether this layout has been invalidated (via BLayout::InvalidateLayout()) and has not yet been validated (by doing a layout, or by its ResetLayoutInvalidation() method.

void	EnableLayoutInvalidation ()
	Re-enable layout invalidation after a call to DisableLayoutInvalidation().

void	DisableLayoutInvalidation ()
	Disable layout invalidation notifications, i.e. calls to this object's InvalidateLayout() method.

Public Member Functions inherited from BLayoutItem
	BLayoutItem (BMessage *from)
	Archive constructor.

virtual status_t	Archive (BMessage *into, bool deep=true) const
	Archive the object into a BMessage.

BLayout *	Layout () const
	Returns the BLayout this BLayoutItem resides in.

virtual status_t	Perform (perform_code d, void *arg)
	Perform some action (Internal method defined for binary compatibility purposes).

bool	RemoveSelf ()
	Remove this layout item from the BLayout it is a part of.

virtual BView *	View ()
	Return the BView this item is representing, or `NULL` if it does not represent any view.

void	SetExplicitSize (BSize size)
	Set the explicity size to size.

void	AlignInFrame (BRect frame)
	Position this BLayoutItem within frame, given the value returned by Alignment(), and the size constraints for this item.

void *	LayoutData () const
	Retrieve arbitrary data attached to this BLayoutItem.

void	SetLayoutData (void *data)
	Attach arbitrary data to this BLayoutItem.

Public Member Functions inherited from BArchivable
	BArchivable ()
	Constructor. Does nothing.

	BArchivable (BMessage *from)
	Constructor. Does important behind-the-scenes work in the unarchiving process.

virtual	~BArchivable ()
	Destructor. Does nothing.

virtual status_t	AllArchived (BMessage *archive) const
	Method relating to the use of `BArchiver`.

virtual status_t	AllUnarchived (const BMessage *archive)
	Method relating to the use of `BUnarchiver`.

virtual status_t	Archive (BMessage *into, bool deep=true) const
	Archive the object into a BMessage.

virtual status_t	Perform (perform_code d, void *arg)
	Perform some action (Internal method defined for binary compatibility purposes).

Static Public Member Functions
static BArchivable *	Instantiate (BMessage *from)
	Instantiate the layout from the message from.

Static Public Member Functions inherited from BArchivable
static BArchivable *	Instantiate (BMessage *archive)
	Static member to restore objects from messages.

Protected Member Functions
virtual status_t	AllArchived (BMessage *into) const
	Method relating to the use of `BArchiver`.

virtual status_t	AllUnarchived (const BMessage *from)
	Unarchives the BLayoutItem's for this layout, calling ItemUnarchived() for each one.

virtual void	GetColumnRowConstraints (orientation orientation, int32 index, ColumnRowConstraints *constraints)
	Fill in the ColumnRowConstraints for a certain column or row in the BTwoDimensionalLayout.

virtual void	GetItemDimensions (BLayoutItem item, Dimensions dimensions)
	Tell the base class what column and row a BLayoutItem is in as well as how many columns and rows it covers.

virtual int32	InternalCountColumns ()
	Get the number of columns in the BTwoDimensionalLayout.

virtual int32	InternalCountRows ()
	Get the number of rows in the BTwoDimensionalLayout.

virtual bool	ItemAdded (BLayoutItem *item, int32 atIndex)
	Hook method called when item is added to this layout.

virtual status_t	ItemArchived (BMessage into, BLayoutItem item, int32 index) const
	Hook for derived classes to add data specific to item to the into BMessage. item resides at index.

virtual void	ItemRemoved (BLayoutItem *item, int32 fromIndex)
	Hook method called when item is removed from this layout.

virtual status_t	ItemUnarchived (const BMessage from, BLayoutItem item, int32 index)
	Hook for derived classes to retrieve data specific to item from the from BMessage. item resides at index.

virtual void	PrepareItems (orientation orientation)
	Prepare the BLayoutItem in this BTwoDimensionalLayout subclass for layout within a certain orientation.

Protected Member Functions inherited from BTwoDimensionalLayout
virtual status_t	AllArchived (BMessage *into) const
	Method relating to the use of `BArchiver`.

virtual status_t	AllUnarchived (const BMessage *from)
	Unarchives the BLayoutItem's for this layout, calling ItemUnarchived() for each one.

virtual void	DoLayout ()
	Implemented by derived classes to position and resize the items in this layout.

virtual status_t	ItemArchived (BMessage into, BLayoutItem item, int32 index) const
	Hook for derived classes to add data specific to item to the into BMessage. item resides at index.

virtual status_t	ItemUnarchived (const BMessage from, BLayoutItem item, int32 index)
	Hook for derived classes to retrieve data specific to item from the from BMessage. item resides at index.

virtual void	LayoutInvalidated (bool children=false)

BSize	AddInsets (BSize size)
	Add the size to all the insets for this layout.

void	AddInsets (float minHeight, float maxHeight, float *preferredHeight)
	Add to the insets, and store the modified values.

BSize	SubtractInsets (BSize size)
	Substract the size from all the insets for this layout.

virtual bool	HasMultiColumnItems ()
	Tests whether or not this BTwoDimensionalLayout contains any BLayoutItem's spanning more than one column.

virtual bool	HasMultiRowItems ()
	Tests whether or not this BTwoDimensionalLayout contains any BLayoutItem's spanning more than one row.

Protected Member Functions inherited from BAbstractLayout
virtual status_t	AllArchived (BMessage *archive) const
	Method relating to the use of `BArchiver`.

virtual status_t	AllUnarchived (const BMessage *from)
	Unarchives the BLayoutItem's for this layout, calling ItemUnarchived() for each one.

virtual void	AncestorVisibilityChanged (bool shown)
	Hook method inherited from BLayoutItem, classes derived from BLayout must include the BLayout version of this method in their implementation.

virtual void	AttachedToLayout ()
	Hook method inherited from BLayoutItem, classes derived from BLayout must include the BLayout version of this method in their implementation.

virtual void	DetachedFromLayout (BLayout *layout)
	Hook method inherited from BLayoutItem, classes derived from BLayout must include the BLayout version of this method in their implementation.

virtual bool	ItemAdded (BLayoutItem *item, int32 atIndex)
	Hook method called when item is added to this layout.

virtual status_t	ItemArchived (BMessage into, BLayoutItem item, int32 index) const
	Hook for derived classes to add data specific to item to the into BMessage. item resides at index.

virtual void	ItemRemoved (BLayoutItem *item, int32 fromIndex)
	Hook method called when item is removed from this layout.

virtual status_t	ItemUnarchived (const BMessage from, BLayoutItem item, int32 index)
	Hook for derived classes to retrieve data specific to item from the from BMessage. item resides at index.

virtual void	LayoutInvalidated (bool children)

virtual void	OwnerChanged (BView *was)
	Hook method called when this layout is attached to a BView.

Protected Member Functions inherited from BLayout
virtual status_t	AllArchived (BMessage *archive) const
	Method relating to the use of `BArchiver`.

void	VisibilityChanged (bool show)
	Method to be called by derived classes in their SetVisible() implementation. Calls AncestorVisibilityChanged() on the items in this BLayout.

void	ResetLayoutInvalidation ()
	Reset layout invalidation, causing InvalidateLayout calls to proceed again. This method should be called once any cached data has been validated, or updated to valid values.

virtual status_t	AllArchived (BMessage *into) const
	Method relating to the use of `BArchiver`.

virtual status_t	AllUnarchived (const BMessage *from)
	Method relating to the use of `BUnarchiver`.

Hook methods

Additional Inherited Members
Protected Attributes inherited from BTwoDimensionalLayout
float	fLeftInset
	The current left inset for this layout.

float	fRightInset
	The current right inset for this layout.

float	fTopInset
	The current top inset for this layout.

float	fBottomInset
	The current bottom inset for this layout.

float	fHSpacing
	the current horizontal spacing between columns for this layout.

float	fVSpacing
	The current vertical spacing between rows for this layout.

Detailed Description

The BGroupLayout class is a simple BLayout subclass that arranges the items it holds within a vertical or horizontal box.

In a horizontal BGroupLayout, each BLayoutItem is given the same vertical area, but different horizontal areas. In a vertical BGroupLayout, each BLayoutItem is given the same horizontal area, but different vertical areas. Despite this, because of alignment and size constraints, the items in a BGroupLayout may not all use the same vertical or horizontal area on screen. Some BLayoutItems may have alignments that cause them to sit at the bottom of the area they are given, for example. This is not a flaw or bug, but something that you may come across when using this class.

In a BGroupLayout, each BLayoutItem or BView has a weight, the default weight is 1.0f. When a BGroupLayout is not given enough space to satisfy the minimum sizes of all items, then space is distributed according to weight, while still attempting to satisfy minimum size constraints. Weighting is scaled over the sum weight of all the items in this layout. If a particular item has half of the sum weight of all items, it will get half of the total space, unless this exceeds that item's maximum size. If the space for an item exceeds the items maximum size, the excess will be distributed to other items.

Warning: This class is not yet finalized, if you use it in your software assume that it will break some time in the future.

Since: Haiku R1

Constructor & Destructor Documentation

◆ BGroupLayout() [1/2]

BGroupLayout::BGroupLayout	(	orientation	orientation,
		float	spacing = `B_USE_DEFAULT_SPACING`
	)

Creates a new BGroupLayout.

Parameters

orientation	The orientation of this BGroupLayout.
spacing	The spacing between BLayoutItems in this BGroupLayout.

Since: Haiku R1

◆ BGroupLayout() [2/2]

BGroupLayout::BGroupLayout ( BMessage * from )

Archive constructor.

Parameters

from	The message to construct the BGroupLayout from.

Since: Haiku R1

◆ ~BGroupLayout()

BGroupLayout::~BGroupLayout ( )

virtual

Destructor method.

Standard Destructor.

Since: Haiku R1

Member Function Documentation

◆ AddItem() [1/4]

bool BGroupLayout::AddItem ( BLayoutItem * item )

virtual

Adds item to this layout as the last item. In a vertical BGroupLayout, item will be on the right, in a horizontal BGroupLayout, item will be at the bottom.

item will have a weight of 1.0f.

Since: Haiku R1

Reimplemented from BLayout.

◆ AddItem() [2/4]

bool BGroupLayout::AddItem	(	BLayoutItem *	item,
		float	weight
	)

virtual

Adds item to the end of this layout with a weight of weight.

Since: Haiku R1

◆ AddItem() [3/4]

bool BGroupLayout::AddItem	(	int32	index,
		BLayoutItem *	item
	)

virtual

Adds item to this layout at index.

item will have a weight of 1.0f.

Since: Haiku R1

Reimplemented from BLayout.

◆ AddItem() [4/4]

bool BGroupLayout::AddItem	(	int32	index,
		BLayoutItem *	item,
		float	weight
	)

virtual

Adds item this layout at index with a weight of weight.

Since: Haiku R1

◆ AddView() [1/4]

BLayoutItem * BGroupLayout::AddView ( BView * child )

virtual

Adds child to this layout as the last item. In a vertical BGroupLayout, child will be on the right, in a horizontal BGroupLayout, child will be at the bottom.

child will have a weight of 1.0f.

Since: Haiku R1

Reimplemented from BLayout.

◆ AddView() [2/4]

BLayoutItem * BGroupLayout::AddView	(	BView *	child,
		float	weight
	)

virtual

Adds child to the end of this layout with a weight of weight.

Since: Haiku R1

◆ AddView() [3/4]

BLayoutItem * BGroupLayout::AddView	(	int32	index,
		BView *	child
	)

virtual

Adds child to this layout at index.

child will have a weight of 1.0f.

Since: Haiku R1

Reimplemented from BLayout.

◆ AddView() [4/4]

BLayoutItem * BGroupLayout::AddView	(	int32	index,
		BView *	child,
		float	weight
	)

virtual

Adds child this layout at index with a weight of weight.

Since: Haiku R1

◆ AllArchived()

virtual status_t BGroupLayout::AllArchived ( BMessage * into ) const

protectedvirtual

Method relating to the use of BArchiver.

This hook function is called once the first BArchiver that was created in an archiving session is either destroyed, or has its Finish() method called. Implementations of this method can be used, in conjunction with BArchiver::IsArchived(), to reference objects in your archive that you do not own, depending on whether or not those objects were archived by their owners. Implementations of this method should call the implementation of their parent class, the same as for the Archive() method.

Warning: To guarantee that your AllArchived() method will be called during archival, you must create a BArchiver object in your Archive() implementation.; You should archive any objects you own in your Archive() method implementation, and NOT your AllArchived() method.

See also: BArchiver BArchiver::Finish()

Since: Haiku R1

Reimplemented from BTwoDimensionalLayout.

◆ AllUnarchived()

virtual status_t BGroupLayout::AllUnarchived ( const BMessage * from )

protectedvirtual

Unarchives the BLayoutItem's for this layout, calling ItemUnarchived() for each one.

Since: Haiku R1

Reimplemented from BTwoDimensionalLayout.

◆ Archive()

virtual status_t BGroupLayout::Archive	(	BMessage *	archive,
		bool	deep = `true`
	)		const

virtual

Archives this layout into archive. If deep is true, also archives the items in this layout, calling ItemArchived() for each one.

Since: Haiku R1

Reimplemented from BTwoDimensionalLayout.

◆ GetColumnRowConstraints()

virtual void BGroupLayout::GetColumnRowConstraints	(	orientation	orientation,
		int32	index,
		ColumnRowConstraints *	constraints
	)

protectedvirtual

Fill in the ColumnRowConstraints for a certain column or row in the BTwoDimensionalLayout.

This method is used to communicate the size constraints and weight for a given row/column in the BTwoDimensionalLayout.

Since: Haiku R1

Implements BTwoDimensionalLayout.

◆ GetItemDimensions()

virtual void BGroupLayout::GetItemDimensions	(	BLayoutItem *	item,
		Dimensions *	dimensions
	)

protectedvirtual

Tell the base class what column and row a BLayoutItem is in as well as how many columns and rows it covers.

Since: Haiku R1

Implements BTwoDimensionalLayout.

◆ Instantiate()

static BArchivable * BGroupLayout::Instantiate ( BMessage * from )

static

Instantiate the layout from the message from.

Since: Haiku R1

◆ InternalCountColumns()

virtual int32 BGroupLayout::InternalCountColumns ( )

protectedvirtual

Get the number of columns in the BTwoDimensionalLayout.

Returns: The number of columns in the BTwoDimensionalLayout.

Since: Haiku R1

Implements BTwoDimensionalLayout.

◆ InternalCountRows()

virtual int32 BGroupLayout::InternalCountRows ( )

protectedvirtual

Get the number of rows in the BTwoDimensionalLayout.

Returns: The number of rows in the BTwoDimensionalLayout.

Since: Haiku R1

Implements BTwoDimensionalLayout.

◆ ItemAdded()

virtual bool BGroupLayout::ItemAdded	(	BLayoutItem *	item,
		int32	atIndex
	)

protectedvirtual

Hook method called when item is added to this layout.

Parameters

item	The BLayoutItem that is being added.
atIndex	The index of the BLayoutItem.

Returns: true on succcess, false if item will not be added.

Note: This is a good time to allocate data for a BLayoutItem and attach it to item via BLayoutItem::SetLayoutData().

Since: Haiku R1

Reimplemented from BAbstractLayout.

◆ ItemArchived()

virtual status_t BGroupLayout::ItemArchived	(	BMessage *	into,
		BLayoutItem *	item,
		int32	index
	)		const

protectedvirtual

Hook for derived classes to add data specific to item to the into BMessage. item resides at index.

Note: The same archive is passed to BLayout::ItemArchived() for all items, so any data added for each item will be stored in an array.

Since: Haiku R1

Reimplemented from BTwoDimensionalLayout.

◆ ItemRemoved()

virtual void BGroupLayout::ItemRemoved	(	BLayoutItem *	item,
		int32	fromIndex
	)

protectedvirtual

Hook method called when item is removed from this layout.

Parameters

item	The BLayoutItem being removed.
fromIndex	The index where item used to reside.

When this hook is called, item is not yet completely removed. It can no longer be accessed with LayoutItemAt(), nor does it contribute to the value of CountItems(), but the item has not yet had its ItemDetached() hook called.

Note: This is a good time to delete the data you've attached to item via BLayoutItem::SetLayoutData().

Since: Haiku R1

Reimplemented from BAbstractLayout.

◆ ItemUnarchived()

virtual status_t BGroupLayout::ItemUnarchived	(	const BMessage *	from,
		BLayoutItem *	item,
		int32	index
	)

protectedvirtual

Hook for derived classes to retrieve data specific to item from the from BMessage. item resides at index.

Note: The same archive is passed to BLayout::ItemArchived() for all items, so any data added for each item will be stored in an array. You should pass index to the BMessage methods you will be using in this method.

Since: Haiku R1

Reimplemented from BTwoDimensionalLayout.

◆ ItemWeight()

float BGroupLayout::ItemWeight ( int32 index ) const

Get the weight of the item at index.

Since: Haiku R1

◆ Orientation()

orientation BGroupLayout::Orientation ( ) const

Get the orientation of this BGroupLayout.

Since: Haiku R1

◆ Perform()

virtual status_t BGroupLayout::Perform	(	perform_code	d,
		void *	arg
	)

virtual

Perform some action (Internal method defined for binary compatibility purposes).

Reimplemented from BTwoDimensionalLayout.

◆ PrepareItems()

virtual void BGroupLayout::PrepareItems ( orientation orientation )

protectedvirtual

Prepare the BLayoutItem in this BTwoDimensionalLayout subclass for layout within a certain orientation.

This is a good place to update cache information that will be used in other hook methods, for example.

Since: Haiku R1

Reimplemented from BTwoDimensionalLayout.

◆ SetItemWeight()

void BGroupLayout::SetItemWeight	(	int32	index,
		float	weight
	)

Set the weight of the item at index.

Since: Haiku R1

◆ SetOrientation()

void BGroupLayout::SetOrientation ( orientation orientation )

Set the orientation of this BGroupLayout.

Parameters

orientation The new orientation of this BGroupLayout.

Since: Haiku R1

◆ SetSpacing()

void BGroupLayout::SetSpacing ( float spacing )

Set the amount of spacing (in pixels) between each item.

Since: Haiku R1

◆ Spacing()

float BGroupLayout::Spacing ( ) const

Get the amount of spacing (in pixels) between each item.

Since: Haiku R1

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BGroupLayout() [1/2]

◆ BGroupLayout() [2/2]

◆ ~BGroupLayout()

Member Function Documentation

◆ AddItem() [1/4]

◆ AddItem() [2/4]

◆ AddItem() [3/4]

◆ AddItem() [4/4]

◆ AddView() [1/4]

◆ AddView() [2/4]

◆ AddView() [3/4]

◆ AddView() [4/4]

◆ AllArchived()

◆ AllUnarchived()

◆ Archive()

◆ GetColumnRowConstraints()

◆ GetItemDimensions()

◆ Instantiate()

◆ InternalCountColumns()

◆ InternalCountRows()

◆ ItemAdded()

◆ ItemArchived()

◆ ItemRemoved()

◆ ItemUnarchived()

◆ ItemWeight()

◆ Orientation()

◆ Perform()

◆ PrepareItems()

◆ SetItemWeight()

◆ SetOrientation()

◆ SetSpacing()

◆ Spacing()