FoArea

FoArea

Synopsis

                    FoArea;
                    FoAreaClass;
FoArea*             fo_area_new                         (void);
FoArea*             fo_area_get_page                    (FoArea *fo_area);
FoArea*             fo_area_get_reference               (FoArea *fo_area);
FoArea*             fo_area_get_page_sequence           (FoArea *fo_area);
gboolean            fo_area_get_is_first                (FoArea *fo_area);
gboolean            fo_area_get_is_last                 (FoArea *fo_area);
gfloat              fo_area_get_next_x                  (FoArea *fo_area);
void                fo_area_set_next_x                  (FoArea *fo_area,
                                                         gfloat new_next_x);
gfloat              fo_area_get_next_y                  (FoArea *fo_area);
void                fo_area_set_next_y                  (FoArea *fo_area,
                                                         gfloat new_next_y);
gfloat              fo_area_get_available_width         (FoArea *fo_area);
void                fo_area_set_available_width         (FoArea *fo_area,
                                                         gfloat new_available_width);
gfloat              fo_area_get_available_height        (FoArea *fo_area);
void                fo_area_set_available_height        (FoArea *fo_area,
                                                         gfloat new_available_height);
gfloat              fo_area_get_child_available_ipdim   (FoArea *fo_area);
void                fo_area_set_child_available_ipdim   (FoArea *fo_area,
                                                         gfloat new_child_available_ipdim);
gfloat              fo_area_get_child_available_bpdim   (FoArea *fo_area);
void                fo_area_set_child_available_bpdim   (FoArea *fo_area,
                                                         gfloat new_child_available_bpdim);
FoFo*               fo_area_get_generated_by            (FoArea *fo_area);
void                fo_area_set_generated_by            (FoArea *fo_area,
                                                         FoFo *new_fo);
FoArea*             fo_area_add_child                   (FoArea *parent,
                                                         FoArea *child);
FoArea*             fo_area_size_request                (FoArea *child);
void                fo_area_debug_dump_properties       (FoArea *area,
                                                         gint depth);
void                fo_area_border_padding_space_resolve
                                                        (FoArea *parent_area,
                                                         FoArea *child_area);
FoArea*             fo_area_break_resolve               (FoArea *parent_area,
                                                         FoArea *new_area);
void                fo_area_set_height_from_children    (FoArea *parent_area);
FoArea*             fo_area_clone                       (FoArea *original);
void                fo_area_update_after_clone          (FoArea *clone,
                                                         FoArea *original);
FoArea*             fo_area_split_before_height         (FoArea *area,
                                                         gfloat height);
gboolean            fo_area_split_before_height_check   (FoArea *area,
                                                         gfloat height);
void                fo_area_resolve_text_align          (FoArea *area);
gboolean            (*FoAreaTraverseFunc)               (FoArea *area,
                                                         gpointer data);
void                (*FoAreaForeachFunc)                (FoArea *area,
                                                         gpointer data);
#define             FO_AREA_IS_ROOT                     (area)
#define             FO_AREA_IS_LEAF                     (area)
FoArea*             fo_area_insert                      (FoArea *parent,
                                                         gint position,
                                                         FoArea *area);
FoArea*             fo_area_insert_before               (FoArea *parent,
                                                         FoArea *sibling,
                                                         FoArea *area);
FoArea*             fo_area_insert_after                (FoArea *parent,
                                                         FoArea *sibling,
                                                         FoArea *area);
FoArea*             fo_area_prepend                     (FoArea *parent,
                                                         FoArea *area);
guint               fo_area_n_areas                     (FoArea *root,
                                                         GTraverseFlags flags);
FoArea*             fo_area_get_root                    (FoArea *area);
gboolean            fo_area_is_ancestor                 (FoArea *area,
                                                         FoArea *descendant);
guint               fo_area_depth                       (FoArea *area);
FoArea*             fo_area_append                      (FoArea *parent,
                                                         FoArea *area);
void                fo_area_traverse                    (FoArea *root,
                                                         GTraverseType order,
                                                         GTraverseFlags flags,
                                                         gint max_depth,
                                                         FoAreaTraverseFunc func,
                                                         gpointer data);
guint               fo_area_max_height                  (FoArea *root);
void                fo_area_children_foreach            (FoArea *area,
                                                         GTraverseFlags flags,
                                                         FoAreaForeachFunc func,
                                                         gpointer data);
void                fo_area_reverse_children            (FoArea *area);
guint               fo_area_n_children                  (FoArea *area);
FoArea*             fo_area_nth_child                   (FoArea *area,
                                                         guint n);
FoArea*             fo_area_last_child                  (FoArea *area);
guint               fo_area_child_position              (FoArea *area,
                                                         FoArea *child);
FoArea*             fo_area_first_sibling               (FoArea *area);
FoArea*             fo_area_last_sibling                (FoArea *area);
FoArea*             fo_area_prev_sibling                (FoArea *area);
FoArea*             fo_area_next_sibling                (FoArea *area);
FoArea*             fo_area_first_child                 (FoArea *area);
FoArea*             fo_area_parent                      (FoArea *area);
void                fo_area_unlink                      (FoArea *area);
void                fo_area_unlink_with_next_siblings   (FoArea *area);
FoArea*             fo_area_insert_with_next_siblings   (FoArea *parent,
                                                         gint position,
                                                         FoArea *area);

Object Hierarchy

  GObject
   +----FoObject
         +----FoNode
               +----FoArea
                     +----FoAreaArea
                     +----FoAreaTree

Properties

  "available-height"         gfloat                : Read / Write
  "available-width"          gfloat                : Read / Write
  "child-available-bpdim"    gfloat                : Read / Write
  "child-available-ipdim"    gfloat                : Read / Write
  "generated-by"             FoFo*                 : Read / Write
  "is-first"                 gboolean              : Read
  "is-last"                  gboolean              : Read
  "next-x"                   gfloat                : Read / Write
  "next-y"                   gfloat                : Read / Write
  "page"                     FoArea*               : Read
  "page-sequence"            FoFo*                 : Read / Write

Description

Details

FoArea

typedef struct _FoArea FoArea;

Instance of the base class for area objects.

FoAreaClass

typedef struct _FoAreaClass FoAreaClass;

Class structure for the base class for area objects.

fo_area_new ()

FoArea*             fo_area_new                         (void);

Creates a new FoArea initialized to default value.

Returns :

 the new FoArea

fo_area_get_page ()

FoArea*             fo_area_get_page                    (FoArea *fo_area);

Gets the page property of area

fo_area :

 The FoArea object

Returns :

 The "page" property value

fo_area_get_reference ()

FoArea*             fo_area_get_reference               (FoArea *fo_area);

Gets the reference property of area

fo_area :

 The FoArea object

Returns :

 The "reference" property value

fo_area_get_page_sequence ()

FoArea*             fo_area_get_page_sequence           (FoArea *fo_area);

Gets the page_sequence property of area

fo_area :

 The FoArea object

Returns :

 The "page-sequence" property value

fo_area_get_is_first ()

gboolean            fo_area_get_is_first                (FoArea *fo_area);

Gets the is_first property of area

fo_area :

 The FoArea object

Returns :

 The "is-first" property value

fo_area_get_is_last ()

gboolean            fo_area_get_is_last                 (FoArea *fo_area);

Gets the is_last property of area

fo_area :

 The FoArea object

Returns :

 The "is-last" property value

fo_area_get_next_x ()

gfloat              fo_area_get_next_x                  (FoArea *fo_area);

Gets the next_x property of area

fo_area :

 The FoArea object

Returns :

 The "next_x" property value

fo_area_set_next_x ()

void                fo_area_set_next_x                  (FoArea *fo_area,
                                                         gfloat new_next_x);

Sets the next-x property of area to new_next_x

fo_area :

 The FoArea object

new_next_x :

 The new "next_x" property value

fo_area_get_next_y ()

gfloat              fo_area_get_next_y                  (FoArea *fo_area);

Gets the "next_y" property of area

fo_area :

 The FoArea object

Returns :

 The "next-y" property value

fo_area_set_next_y ()

void                fo_area_set_next_y                  (FoArea *fo_area,
                                                         gfloat new_next_y);

Sets the next-y property of area to new_next_y

fo_area :

 The FoArea object

new_next_y :

 The new "next-y" property value

fo_area_get_available_width ()

gfloat              fo_area_get_available_width         (FoArea *fo_area);

Gets the "available-width" property of area

fo_area :

 The FoArea object

Returns :

 The "available-width" property value

fo_area_set_available_width ()

void                fo_area_set_available_width         (FoArea *fo_area,
                                                         gfloat new_available_width);

Sets the "available-width" property of area to new_available_width

fo_area :

 The FoArea object

new_available_width :

 The new "available-width" property value

fo_area_get_available_height ()

gfloat              fo_area_get_available_height        (FoArea *fo_area);

Gets the available-height property of area

fo_area :

 The FoArea object

Returns :

 The "available_height" property value

fo_area_set_available_height ()

void                fo_area_set_available_height        (FoArea *fo_area,
                                                         gfloat new_available_height);

Sets the available-height property of area to new_available_height

fo_area :

 The FoArea object

new_available_height :

 The new "available-height" property value

fo_area_get_child_available_ipdim ()

gfloat              fo_area_get_child_available_ipdim   (FoArea *fo_area);

Gets the "child-available-ipdim" property of area

fo_area :

 The FoArea object

Returns :

 The "child-available-ipdim" property value

fo_area_set_child_available_ipdim ()

void                fo_area_set_child_available_ipdim   (FoArea *fo_area,
                                                         gfloat new_child_available_ipdim);

Sets the "child-available-ipdim" property of area to new_child_available_ipdim

fo_area :

 The FoArea object

new_child_available_ipdim :

 The new "child-available-ipdim" property value

fo_area_get_child_available_bpdim ()

gfloat              fo_area_get_child_available_bpdim   (FoArea *fo_area);

Gets the "child-available-bpdim" property of area

fo_area :

 The FoArea object

Returns :

 The "child-available-bpdim" property value

fo_area_set_child_available_bpdim ()

void                fo_area_set_child_available_bpdim   (FoArea *fo_area,
                                                         gfloat new_child_available_bpdim);

Sets the "child-available-bpdim" property of area to new_child_available_bpdim

fo_area :

 The FoArea object

new_child_available_bpdim :

 The new "child-available-bpdim" property value

fo_area_get_generated_by ()

FoFo*               fo_area_get_generated_by            (FoArea *fo_area);

Gets the generated-by property of area

fo_area :

 The FoArea object

Returns :

 The "generated-by" property value

fo_area_set_generated_by ()

void                fo_area_set_generated_by            (FoArea *fo_area,
                                                         FoFo *new_fo);

Sets the generated-by property of area to new_fo

fo_area :

 The FoArea object

new_fo :

 The new "generated-by" property value

fo_area_add_child ()

FoArea*             fo_area_add_child                   (FoArea *parent,
                                                         FoArea *child);

Add child to parent by calling the _add_child() function for parent.

parent :

 Parent area node

child :

 Child area node

Returns :

 child

fo_area_size_request ()

FoArea*             fo_area_size_request                (FoArea *child);

Checks that the parent area of child has sufficient space for child. If not enough space, requests that the parent has sufficient space allocated for it, then adjusts child and its siblings as necessary to fit into the resized parent area.

You should call #fo_area_size_request() immediately after adding an area to the area tree or making a change to the area's height.

The child area's requested height is taken from the area's height property value. Its requested width is taken from its width property value.

The height allocated to the area is set in the area's available_height property value. Its width allocation is set in its available_width property value.

Immediately after calling this function, the child area should set its height and width according to the available_height and available_width property values. How the child area resolves any difference between the available height and width and the height and width that it needs is up to the child area to work out.

The child area's x and y property values may also have been adjusted, but a child area doesn't set its own x and y property values anyway.

The area that is returned may be a different area object than the child area that is passed as the argument to this function. For example, the parent area may not have been large enough to contain the child area at its requested height, and the child area, the parent area, and all ancestor areas up to an FoAreaPage may have been split (possibly more than once) and the overflow placed on one or more new pages.

child :

 Child area

Returns :

 Pointer to the last area generated from child after any reallocation and resizing

fo_area_debug_dump_properties ()

void                fo_area_debug_dump_properties       (FoArea *area,
                                                         gint depth);

Dump the properties of area.

area :

 The FoArea object

depth :

 Indent level to add to the output

fo_area_border_padding_space_resolve ()

void                fo_area_border_padding_space_resolve
                                                        (FoArea *parent_area,
                                                         FoArea *child_area);

Resolves the border, padding, and space properties of child_area.

parent_area :

 Parent area of child_area.

child_area :

 FoArea for which to resolve properties.

fo_area_break_resolve ()

FoArea*             fo_area_break_resolve               (FoArea *parent_area,
                                                         FoArea *new_area);

Resolves the break properties of new_area, which may result in new_area being split into multiple areas.

parent_area :

 Parent area of new_area.

new_area :

 FoArea for which to resolve breaks.

Returns :

 Last area resulting from resolving breaks.

fo_area_set_height_from_children ()

void                fo_area_set_height_from_children    (FoArea *parent_area);

parent_area :

fo_area_clone ()

FoArea*             fo_area_clone                       (FoArea *original);

Make a clone of original and insert the clone after original in the area tree. Set instance properties of the clone to match original.

original :

 Area object to be cloned.

Returns :

 Clone of original.

fo_area_update_after_clone ()

void                fo_area_update_after_clone          (FoArea *clone,
                                                         FoArea *original);

Update the instance variables of clone to match those of original.

clone :

 New object cloned from original.

original :

 Original area object.

fo_area_split_before_height ()

FoArea*             fo_area_split_before_height         (FoArea *area,
                                                         gfloat height);

Split area at or before height.

area :

 FoArea to be split

height :

 Maximum block-progression-dimension of area

Returns :

 The part of area spit from area, or NULL if unsplit.

fo_area_split_before_height_check ()

gboolean            fo_area_split_before_height_check   (FoArea *area,
                                                         gfloat height);

Check whether area can split at or before height.

area :

 FoArea to be split

height :

 Maximum block-progression-dimension of area

Returns :

 TRUE if can split, otherwise FALSE.

fo_area_resolve_text_align ()

void                fo_area_resolve_text_align          (FoArea *area);

Resolves the text alignment value for area and its descendants.

area :

 FoArea for which to resolve text alignment.

FoAreaTraverseFunc ()

gboolean            (*FoAreaTraverseFunc)               (FoArea *area,
                                                         gpointer data);

area :

data :

Returns :

FoAreaForeachFunc ()

void                (*FoAreaForeachFunc)                (FoArea *area,
                                                         gpointer data);

area :

data :

FO_AREA_IS_ROOT()

#define FO_AREA_IS_ROOT(area)    (FO_NODE_IS_ROOT(((FoNode*) (area))))

area :

FO_AREA_IS_LEAF()

#define FO_AREA_IS_LEAF(area)    (FO_NODE_IS_LEAF(((FoNode*) (area))))

area :

fo_area_insert ()

FoArea*             fo_area_insert                      (FoArea *parent,
                                                         gint position,
                                                         FoArea *area);

parent :

position :

area :

Returns :

fo_area_insert_before ()

FoArea*             fo_area_insert_before               (FoArea *parent,
                                                         FoArea *sibling,
                                                         FoArea *area);

parent :

sibling :

area :

Returns :

fo_area_insert_after ()

FoArea*             fo_area_insert_after                (FoArea *parent,
                                                         FoArea *sibling,
                                                         FoArea *area);

parent :

sibling :

area :

Returns :

fo_area_prepend ()

FoArea*             fo_area_prepend                     (FoArea *parent,
                                                         FoArea *area);

Inserts a FoArea as the first child of the given parent and updates the inserted FoArea.

parent :

 the FoArea to place the new FoArea under.

area :

 the FoArea to insert.

Returns :

 the inserted FoArea.

fo_area_n_areas ()

guint               fo_area_n_areas                     (FoArea *root,
                                                         GTraverseFlags flags);

Gets the number of nodes in a tree.

root :

 a FoArea.

flags :

 which types of children are to be counted, one of G_TRAVERSE_ALL, G_TRAVERSE_LEAFS and G_TRAVERSE_NON_LEAFS.

Returns :

 the number of nodes in the tree.

fo_area_get_root ()

FoArea*             fo_area_get_root                    (FoArea *area);

area :

Returns :

fo_area_is_ancestor ()

gboolean            fo_area_is_ancestor                 (FoArea *area,
                                                         FoArea *descendant);

area :

descendant :

Returns :

fo_area_depth ()

guint               fo_area_depth                       (FoArea *area);

Gets the depth of a FoArea.

If area is NULL the depth is 0. The root node has a depth of 1. For the children of the root node the depth is 2. And so on.

area :

 a FoArea.

Returns :

 the depth of the FoArea.

fo_area_append ()

FoArea*             fo_area_append                      (FoArea *parent,
                                                         FoArea *area);

Inserts a FoArea as the last child of the given parent and updates the inserted FoArea.

parent :

 the FoArea to place the new FoArea under.

area :

 the FoArea to insert.

Returns :

 the inserted FoArea.

fo_area_traverse ()

void                fo_area_traverse                    (FoArea *root,
                                                         GTraverseType order,
                                                         GTraverseFlags flags,
                                                         gint max_depth,
                                                         FoAreaTraverseFunc func,
                                                         gpointer data);

root :

order :

flags :

max_depth :

func :

data :

fo_area_max_height ()

guint               fo_area_max_height                  (FoArea *root);

Gets the maximum height of all branches beneath a FoArea. This is the maximum distance from the FoArea to all leaf nodes.

If root is NULL, 0 is returned. If root has no children, 1 is returned. If root has children, 2 is returned. And so on.

root :

 Root node of a FoArea tree.

Returns :

 the maximum height of the tree beneath root.

fo_area_children_foreach ()

void                fo_area_children_foreach            (FoArea *area,
                                                         GTraverseFlags flags,
                                                         FoAreaForeachFunc func,
                                                         gpointer data);

Calls a function for each of the children of a FoArea. Note that it doesn't descend beneath the child nodes.

area :

 a FoArea.

flags :

 which types of children are to be visited, one of G_TRAVERSE_ALL, G_TRAVERSE_LEAFS and G_TRAVERSE_NON_LEAFS.

func :

 the function to call for each visited node.

data :

 user data to pass to the function.

fo_area_reverse_children ()

void                fo_area_reverse_children            (FoArea *area);

Reverses the order of the children of a FoArea. (It doesn't change the order of the grandchildren.)

area :

 a FoArea.

fo_area_n_children ()

guint               fo_area_n_children                  (FoArea *area);

Gets the number of children of a FoArea.

area :

 a FoArea.

Returns :

 the number of children of area.

fo_area_nth_child ()

FoArea*             fo_area_nth_child                   (FoArea *area,
                                                         guint n);

Gets a child of a FoArea, using the given index. The first child is at index 0. If the index is too big, NULL is returned.

area :

 a FoArea.

n :

 the index of the desired child.

Returns :

 the child of area at index n.

fo_area_last_child ()

FoArea*             fo_area_last_child                  (FoArea *area);

Gets the last child of a FoArea.

area :

 a FoArea (nust not be NULL).

Returns :

 the last child of area, or NULL if area has no children.

fo_area_child_position ()

guint               fo_area_child_position              (FoArea *area,
                                                         FoArea *child);

Gets the position of a FoArea with respect to its siblings. child must be a child of area. The first child is numbered 0, the second 1, and so on.

area :

 a FoArea.

child :

 a child of area.

Returns :

 the position of child with respect to its siblings.

fo_area_first_sibling ()

FoArea*             fo_area_first_sibling               (FoArea *area);

Gets the first sibling of a FoArea. This could possibly be the node itself.

area :

 a FoArea.

Returns :

 the first sibling of area.

fo_area_last_sibling ()

FoArea*             fo_area_last_sibling                (FoArea *area);

Gets the last sibling of a FoArea. This could possibly be the node itself.

area :

 a FoArea.

Returns :

 the last sibling of area.

fo_area_prev_sibling ()

FoArea*             fo_area_prev_sibling                (FoArea *area);

Gets the previous sibling of a FoArea.

area :

 a FoArea.

Returns :

 the previous sibling of area, or NULL if area is NULL.

fo_area_next_sibling ()

FoArea*             fo_area_next_sibling                (FoArea *area);

Gets the next sibling of a FoArea.

area :

 a FoArea.

Returns :

 the next sibling of area, or NULL if area is NULL.

fo_area_first_child ()

FoArea*             fo_area_first_child                 (FoArea *area);

Gets the first child of a FoArea.

area :

 A FoArea.

Returns :

 the first child of area, or NULL if area is NULL or has no children.

fo_area_parent ()

FoArea*             fo_area_parent                      (FoArea *area);

Gets the parent of a FoArea.

area :

 a FoArea.

Returns :

 the parent of area, or NULL if area is the root of the tree.

fo_area_unlink ()

void                fo_area_unlink                      (FoArea *area);

Unlinks an FoArea from an FoArea tree, resulting in two separate trees.

area :

 the FoArea to unlink, which becomes the root of a new tree.

fo_area_unlink_with_next_siblings ()

void                fo_area_unlink_with_next_siblings   (FoArea *area);

Unlinks area and its following siblings.

area :

 First FoArea to unlink.

fo_area_insert_with_next_siblings ()

FoArea*             fo_area_insert_with_next_siblings   (FoArea *parent,
                                                         gint position,
                                                         FoArea *area);

Implements fo_node_insert_with_next_siblings for FoArea.

parent :

 FoArea to be parent of area and its siblings.

position :

 Offset at which to insert area and its siblings.

area :

 FoArea, possibly with following siblings.

Returns :

 parent with area and siblings inserted.

Property Details

The "available-height" property

  "available-height"         gfloat                : Read / Write

Height available to child areas.

Default value: 0

The "available-width" property

  "available-width"          gfloat                : Read / Write

Width available to child areas.

Allowed values: >= 0

Default value: 0

The "child-available-bpdim" property

  "child-available-bpdim"    gfloat                : Read / Write

Block-progression-dimension available to child areas.

Allowed values: >= 0

Default value: 0

The "child-available-ipdim" property

  "child-available-ipdim"    gfloat                : Read / Write

Inline-progression-dimension available to child areas.

Allowed values: >= 0

Default value: 0

The "generated-by" property

  "generated-by"             FoFo*                 : Read / Write

Formatting object that generated this area.

The "is-first" property

  "is-first"                 gboolean              : Read

Is this the first area produced by the formatting object?.

Default value: TRUE

The "is-last" property

  "is-last"                  gboolean              : Read

Is this the last area produced by the formatting object?.

Default value: TRUE

The "next-x" property

  "next-x"                   gfloat                : Read / Write

x-coordinate of next child area.

Allowed values: >= 0

Default value: 0

The "next-y" property

  "next-y"                   gfloat                : Read / Write

y-coordinate of next child area.

Allowed values: >= 0

Default value: 0

The "page" property

  "page"                     FoArea*               : Read

Ancestor FoAreaPage node in the area tree.

The "page-sequence" property

  "page-sequence"            FoFo*                 : Read / Write

Ancestor fo:page_sequence node in the formatting object tree.

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