FLTK 1.4.5: Fl_Tree_Item Class Reference

FLTK 1.4.5

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Fl_Tree_Item Class Reference

Tree widget item. More...

`#include <Fl_Tree_Item.H>`

## Public Member Functions
void | activate (int val=1)
| Change the item's activation state to the optionally specified 'val'.
Fl_Tree_Item * | add (const Fl_Tree_Prefs &prefs, char **arr)
| Descend into the path specified by `'arr'`, and add a new child there.
Fl_Tree_Item * | add (const Fl_Tree_Prefs &prefs, char **arr, Fl_Tree_Item *newitem)
| Descend into path specified by `'arr'` and add `'newitem'` there.
Fl_Tree_Item * | add (const Fl_Tree_Prefs &prefs, const char *new_label)
| Add a new child to this item with the name `'new_label'` and defaults from `'prefs'`.
Fl_Tree_Item * | add (const Fl_Tree_Prefs &prefs, const char *new_label, Fl_Tree_Item *newitem)
| Add `'item'` as immediate child with `'new_label'` and defaults from `'prefs'`.
Fl_Tree_Item * | child (int index)
| Return the child item for the given 'index'.
const Fl_Tree_Item * | child (int t) const
| Return the const child item for the given 'index'.
int | children () const
| Return the number of children this item has.
void | clear_children ()
| Clear all the children for this item.
void | close ()
| Close this item and all its children.
void | deactivate ()
| Deactivate the item; the callback() won't be invoked when clicked.
Fl_Tree_Item * | deparent (int index)
| Deparent child at index position `'pos'`.
int | depth () const
| Returns how many levels deep this item is in the hierarchy.
void | deselect ()
| Disable the item's selection state.
int | deselect_all ()
| Deselect item and all its children.
void | draw (int X, int &Y, int W, Fl_Tree_Item *itemfocus, int &tree_item_xmax, int lastchild=1, int render=1)
| Draw this item and its children.
virtual int | draw_item_content (int render)
| Draw the item content.
int | event_on_collapse_icon (const Fl_Tree_Prefs &prefs) const
| Was the event on the 'collapse' button of this item?
int | event_on_item (const Fl_Tree_Prefs &prefs) const
| Was event anywhere on the item?
int | event_on_label (const Fl_Tree_Prefs &prefs) const
| Was event on the label() of this item?
int | event_on_user_icon (const Fl_Tree_Prefs &prefs) const
| Was the event on the 'user icon' of this item, if any?
int | find_child (const char *name)
| Return the index of the immediate child of this item that has the label `'name'`.
int | find_child (Fl_Tree_Item *item)
| Find the index number for the specified `'item'` in the current item's list of children.
Fl_Tree_Item * | find_child_item (char **arr)
| Non-const version of Fl_Tree_Item::find_child_item(char **arr) const.
const Fl_Tree_Item * | find_child_item (char **arr) const
| Find child item by descending array `'arr'` of names.
Fl_Tree_Item * | find_child_item (const char *name)
| Non-const version of Fl_Tree_Item::find_child_item(const char *name) const.
const Fl_Tree_Item * | find_child_item (const char *name) const
| Return the /immediate/ child of current item that has the label `'name'`.
Fl_Tree_Item * | find_clicked (const Fl_Tree_Prefs &prefs, int yonly=0)
| Non-const version of Fl_Tree_Item::find_clicked(const Fl_Tree_Prefs&,int) const.
const Fl_Tree_Item * | find_clicked (const Fl_Tree_Prefs &prefs, int yonly=0) const
| Find the item that the last event was over.
Fl_Tree_Item * | find_item (char **arr)
| Non-const version of Fl_Tree_Item::find_item(char **names) const.
const Fl_Tree_Item * | find_item (char **arr) const
| Find item by descending array of `'names'`.
| Fl_Tree_Item (const Fl_Tree_Item *o)
| Copy constructor.
| Fl_Tree_Item (const Fl_Tree_Prefs &prefs)
| Constructor.
| Fl_Tree_Item (Fl_Tree *tree)
| Constructor.
int | h () const
| The item's height.
int | has_children () const
| See if this item has children.
Fl_Tree_Item * | insert (const Fl_Tree_Prefs &prefs, const char *new_label, int pos=0)
| Insert a new item named `'new_label'` into current item's children at a specified position `'pos'`.
Fl_Tree_Item * | insert_above (const Fl_Tree_Prefs &prefs, const char *new_label)
| Insert a new item named `'new_label'` above this item.
char | is_activated () const
| See if the item is activated.
char | is_active () const
| See if the item is activated. Alias for is_activated().
int | is_close () const
| See if the item is 'closed'.
int | is_open () const
| See if the item is 'open'.
int | is_root () const
| Is this item the root of the tree?
char | is_selected () const
| See if the item is selected.
int | is_visible () const
| See if the item is visible.
int | is_visible_r () const
| See if item and all its parents are open() and visible().
const char * | label () const
| Return the label.
void | label (const char *val)
| Set the label to `'name'`.
int | label_h () const
| The item's label height.
int | label_w () const
| The item's maximum label width to right edge of Fl_Tree's inner width within scrollbars.
int | label_x () const
| The item's label x position relative to the window.
int | label_y () const
| The item's label y position relative to the window.
Fl_Color | labelbgcolor () const
| Return item's label background text color.
void | labelbgcolor (Fl_Color val)
| Set item's label background color.
Fl_Color | labelcolor () const
| Return item's label text color. Alias for labelfgcolor() const).
void | labelcolor (Fl_Color val)
| Set item's label text color. Alias for labelfgcolor(Fl_Color)).
Fl_Color | labelfgcolor () const
| Return item's label foreground text color.
void | labelfgcolor (Fl_Color val)
| Set item's label foreground text color.
Fl_Font | labelfont () const
| Get item's label font face.
void | labelfont (Fl_Font val)
| Set item's label font face.
Fl_Fontsize | labelsize () const
| Get item's label font size.
void | labelsize (Fl_Fontsize val)
| Set item's label font size.
int | move (Fl_Tree_Item *item, int op=0, int pos=0)
| Move the current item above/below/into the specified `'item'`, where `'op'` determines the type of move:
int | move (int to, int from)
| Move an item within its parent using index numbers.
int | move_above (Fl_Tree_Item *item)
| Move the current item above the specified `'item'`.
int | move_below (Fl_Tree_Item *item)
| Move the current item below the specified `'item'`.
int | move_into (Fl_Tree_Item *item, int pos=0)
| Parent the current item as a child of the specified `'item'`.
Fl_Tree_Item * | next ()
| Return the next item in the tree.
Fl_Tree_Item * | next_displayed (Fl_Tree_Prefs &prefs)
| Same as next_visible().
Fl_Tree_Item * | next_sibling ()
| Return this item's next sibling.
Fl_Tree_Item * | next_visible (Fl_Tree_Prefs &prefs)
| Return the next open(), visible() item.
void | open ()
| Open this item and all its children.
void | open_toggle ()
| Toggle the item's open/closed state.
Fl_Tree_Item * | parent ()
| Return the parent for this item. Returns NULL if we are the root.
const Fl_Tree_Item * | parent () const
| Return the const parent for this item. Returns NULL if we are the root.
void | parent (Fl_Tree_Item *val)
| Set the parent for this item.
const Fl_Tree_Prefs & | prefs () const
| Return the parent tree's prefs.
Fl_Tree_Item * | prev ()
| Return the previous item in the tree.
Fl_Tree_Item * | prev_displayed (Fl_Tree_Prefs &prefs)
| Same as prev_visible().
Fl_Tree_Item * | prev_sibling ()
| Return this item's previous sibling.
Fl_Tree_Item * | prev_visible (Fl_Tree_Prefs &prefs)
| Return the previous open(), visible() item.
int | remove_child (const char *new_label)
| Remove immediate child (and its children) by its label `'name'`.
int | remove_child (Fl_Tree_Item *item)
| Remove `'item'` from the current item's children.
int | reparent (Fl_Tree_Item *newchild, int index)
| Reparent specified item as a child of ourself at position `'pos'`.
Fl_Tree_Item * | replace (Fl_Tree_Item *new_item)
| Replace the current item with a new item.
Fl_Tree_Item * | replace_child (Fl_Tree_Item *olditem, Fl_Tree_Item *newitem)
| Replace existing child `'olditem'` with `'newitem'`.
void | select (int val=1)
| Change the item's selection state to the optionally specified 'val'.
int | select_all ()
| Select item and all its children.
void | select_toggle ()
| Toggle the item's selection state.
void | show_self (const char *indent="") const
| Print the tree as 'ascii art' to stdout.
int | swap_children (Fl_Tree_Item *a, Fl_Tree_Item *b)
| Swap two of our immediate children, given item pointers.
void | swap_children (int ax, int bx)
| Swap two of our children, given two child index values `'ax'` and `'bx'`.
Fl_Tree * | tree ()
| Return the tree for this item.
const Fl_Tree * | tree () const
| Return the tree for this item.
void | update_prev_next (int index)
| Update our _prev_sibling and _next_sibling pointers to point to neighbors given `index` as being our current position in the parent's item array.
void * | user_data () const
| Retrieve the user-data value that has been assigned to the item.
void | user_data (void *data)
| Set a user-data value for the item.
Fl_Image * | userdeicon () const
| Return the deactivated version of the user icon, if any.
void | userdeicon (Fl_Image *val)
| Set the usericon to draw when the item is deactivated.
Fl_Image * | usericon () const
| Get the item's user icon as an Fl_Image. Returns '0' if disabled.
void | usericon (Fl_Image *val)
| Set the item's user icon to an Fl_Image.
int | visible () const
| See if the item is visible. Alias for is_visible().
int | visible_r () const
| See if item and all its parents are open() and visible().
int | w () const
| The entire item's width to right edge of Fl_Tree's inner width within scrollbars.
Fl_Widget * | widget () const
| Return FLTK widget assigned to this item.
void | widget (Fl_Widget *val)
| Assign an FLTK widget to this item.
int | x () const
| The item's x position relative to the window.
int | y () const
| The item's y position relative to the window.

## Protected Member Functions
void | _Init (const Fl_Tree_Prefs &prefs, Fl_Tree *tree)
int | calc_item_height (const Fl_Tree_Prefs &prefs) const
| Return the item's 'visible' height.
virtual void | draw_horizontal_connector (int x1, int x2, int y, const Fl_Tree_Prefs &prefs)
| Horizontal connector line based on preference settings.
virtual void | draw_vertical_connector (int x, int y1, int y2, const Fl_Tree_Prefs &prefs)
| Vertical connector line based on preference settings.
Fl_Color | drawbgcolor () const
| Returns the recommended background color used for drawing this item.
Fl_Color | drawfgcolor () const
| Returns the recommended foreground color used for drawing this item.
void | hide_widgets ()
| Internal: Hide the FLTK widget() for this item and all children.
int | is_flag (unsigned short val) const
| See if flag set. Returns 0 or 1.
void | recalc_tree ()
| Call this when our geometry is changed.
void | set_flag (unsigned short flag, int val)
| Set a flag to an on or off value. val is 0 or 1.
void | show_widgets ()
| Internal: Show the FLTK widget() for this item and all children.

## Detailed Description

Tree widget item.

This class is a single tree item, and manages all of the item's attributes. Fl_Tree_Item is used by Fl_Tree, which is comprised of many instances of Fl_Tree_Item.

Fl_Tree_Item is hierarchical; it dynamically manages an Fl_Tree_Item_Array of children that are themselves instances of Fl_Tree_Item. Each item can have zero or more children. When an item has children, close() and open() can be used to hide or show them.

Items have their own attributes; font size, face, color. Items maintain their own hierarchy of children.

When you make changes to items, you'll need to tell the tree to redraw() for the changes to show up.

New 1.3.3 ABI feature: You can define custom items by either adding a custom widget to the item with Fl_Tree_Item::widget(), or override the draw_item_content() method if you want to just redefine how the label is drawn.

The following shows the Fl_Tree_Item's dimensions, useful when overriding the draw_item_content() method:

Fl_Tree_Item's internal dimensions.

## Constructor & Destructor Documentation

## ◆ Fl_Tree_Item() [1/2]

Fl_Tree_Item::Fl_Tree_Item | ( | const Fl_Tree_Prefs & | prefs | ) |

Constructor.

Makes a new instance of Fl_Tree_Item using defaults from `'prefs'`.

Deprecated
  in 1.3.3 ABI – you must use Fl_Tree_Item(Fl_Tree*) for proper horizontal scrollbar behavior.

## ◆ Fl_Tree_Item() [2/2]

Fl_Tree_Item::Fl_Tree_Item | ( | Fl_Tree * | tree | ) |

Constructor.

Makes a new instance of Fl_Tree_Item for `'tree'`.

This must be used instead of the older, deprecated Fl_Tree_Item(Fl_Tree_Prefs) constructor for proper horizontal scrollbar calculation.

Version
  1.3.3 ABI feature

## Member Function Documentation

## ◆ activate()

void Fl_Tree_Item::activate | ( | int | val = 1 | ) |
| inline

Change the item's activation state to the optionally specified 'val'.

When deactivated, the item will be 'grayed out'; the callback() won't be invoked if the user clicks on the label. If a widget() is associated with the item, its activation state will be changed as well.

If 'val' is not specified, the item will be activated.

## ◆ add() [1/4]

Fl_Tree_Item * Fl_Tree_Item::add | ( | const Fl_Tree_Prefs & | prefs,
|  | char ** | arr )

Descend into the path specified by `'arr'`, and add a new child there.

Should be used only by Fl_Tree's internals. Adds the item based on the value of prefs.sortorder().

Returns
  the item added.

Version
  1.3.0 release

## ◆ add() [2/4]

Fl_Tree_Item * Fl_Tree_Item::add | ( | const Fl_Tree_Prefs & | prefs,
|  | char ** | arr,
|  | Fl_Tree_Item * | newitem )

Descend into path specified by `'arr'` and add `'newitem'` there.

Should be used only by Fl_Tree's internals. If item is NULL, a new item is created. Adds the item based on the value of prefs.sortorder().

Returns
  the item added.

Version
  1.3.3 ABI feature

## ◆ add() [3/4]

Fl_Tree_Item * Fl_Tree_Item::add | ( | const Fl_Tree_Prefs & | prefs,
|  | const char * | new_label )

Add a new child to this item with the name `'new_label'` and defaults from `'prefs'`.

An internally managed copy is made of the label string. Adds the item based on the value of prefs.sortorder().

Returns
  the item added

Version
  1.3.0 release

## ◆ add() [4/4]

Fl_Tree_Item * Fl_Tree_Item::add | ( | const Fl_Tree_Prefs & | prefs,
|  | const char * | new_label,
|  | Fl_Tree_Item * | item )

Add `'item'` as immediate child with `'new_label'` and defaults from `'prefs'`.

If `'item'` is NULL, a new item is created. An internally managed copy is made of the label string. Adds the item based on the value of prefs.sortorder().

Returns
  the item added

Version
  1.3.3

## ◆ calc_item_height()

int Fl_Tree_Item::calc_item_height | ( | const Fl_Tree_Prefs & | prefs | ) | const
| protected

Return the item's 'visible' height.

Takes into account the item's:

- visibility (if !is_visible(), returns 0)
- labelfont() height: if label() != NULL
- widget() height: if widget() != NULL
- openicon() height (if has children)
- usericon() height (if not NULL) Does NOT include Fl_Tree::linespacing();
  Returns
    maximum pixel height

## ◆ child()

const Fl_Tree_Item * Fl_Tree_Item::child | ( | int | t | ) | const

Return the const child item for the given 'index'.

Return const child item for the specified 'index'.

## ◆ deactivate()

void Fl_Tree_Item::deactivate | ( |  | ) |
| inline

Deactivate the item; the callback() won't be invoked when clicked.

Same as activate(0)

## ◆ deparent()

Fl_Tree_Item * Fl_Tree_Item::deparent | ( | int | pos | ) |

Deparent child at index position `'pos'`.

This creates an "orphaned" item that is still allocated, but has no parent or siblings. Normally the caller would want to immediately reparent the orphan elsewhere.

A successfully orphaned item will have its parent() and prev_sibling()/next_sibling() set to NULL.

Returns
  - pointer to orphaned item on success
  - NULL on error (could not deparent the item)

See also
  reparent()

## ◆ depth()

int Fl_Tree_Item::depth | ( |  | ) | const

Returns how many levels deep this item is in the hierarchy.

For instance; root has a depth of zero, and its immediate children would have a depth of 1, and so on. Use e.g. for determining the horizontal indent of this item during drawing.

## ◆ deselect_all()

int Fl_Tree_Item::deselect_all | ( |  | ) |
| inline

Deselect item and all its children.

Returns count of how many items were in the 'selected' state, ie. how many items were "changed".

## ◆ draw()

void Fl_Tree_Item::draw | ( | int | X,
|  | int & | Y,
|  | int | W,
|  | Fl_Tree_Item * | itemfocus,
|  | int & | tree_item_xmax,
|  | int | lastchild = 1,
|  | int | render = 1 )

Draw this item and its children.

Parameters

  [in] | X | Horizontal position for item being drawn
  [in,out] | Y | Vertical position for item being drawn, returns new position for next item
  [in] | W | Recommended width for item
  [in] | itemfocus | The tree's current focus item (if any)
  [in,out] | tree_item_xmax | The tree's running xmax (right-most edge so far). Mainly used by parent tree when render==0 to calculate tree's max width.
  [in] | lastchild | Is this item the last child in a subtree?
  [in] | render | Whether or not to render the item: 0: no rendering, just calculate size w/out drawing. 1: render item as well as size calc

Version
  1.3.3 ABI feature: modified parameters

## ◆ draw_horizontal_connector()

void Fl_Tree_Item::draw_horizontal_connector | ( | int | x1,
|  | int | x2,
|  | int | y,
|  | const Fl_Tree_Prefs & | prefs )
| protectedvirtual

Horizontal connector line based on preference settings.

This method can be overridden to implement custom connection line drawing.

Parameters

  [in] | x1 | The left hand X position of the horizontal connector
  [in] | x2 | The right hand X position of the horizontal connector
  [in] | y | The vertical position of the horizontal connector
  [in] | prefs | The Fl_Tree prefs

## ◆ draw_item_content()

int Fl_Tree_Item::draw_item_content | ( | int | render | ) |
| virtual

Draw the item content.

This method can be overridden to implement custom drawing by filling the label_[xywh]() area with content.

A minimal example of how to override draw_item_content() and draw just a normal item's background and label ourselves:

class MyTreeItem : public Fl_Tree_Item {
public:
MyTreeItem() { }
~MyTreeItem() { }
// DRAW OUR CUSTOM CONTENT FOR THE ITEM
int draw_item_content(int render) {
// Our item's dimensions + text content
int X=label_x(), Y=label_y(), W=label_w(), H=label_h();
const char *text = label() ? label() : "";
// Rendering? Do any drawing that's needed
if ( render ) {
// Draw bg -- a filled rectangle
fl_color(drawbgcolor()); fl_rectf(X,Y,W,H);
// Draw label
fl_font(labelfont(), labelsize()); // use item's label font/size
fl_color(drawfgcolor()); // use recommended fg color
fl_draw(text, X,Y,W,H, FL_ALIGN_LEFT); // draw the item's label
}
// Rendered or not, we must calculate content's max X position
int lw=0, lh=0;
fl_measure(text, lw, lh); // get width of label text
return X + lw; // return X + label width
}
};
FL_ALIGN_LEFT
const Fl_Align FL_ALIGN_LEFT
Align the label at the left of the widget.
Definition Enumerations.H:1001
Fl_Tree_Item::draw_item_content
virtual int draw_item_content(int render)
Draw the item content.
Definition Fl_Tree_Item.cxx:924
Fl_Tree_Item::label
void label(const char *val)
Set the label to 'name'.
Definition Fl_Tree_Item.cxx:158
Fl_Tree_Item::drawbgcolor
Fl_Color drawbgcolor() const
Returns the recommended background color used for drawing this item.
Definition Fl_Tree_Item.cxx:849
Fl_Tree_Item::label_y
int label_y() const
The item's label y position relative to the window.
Definition Fl_Tree_Item.H:127
Fl_Tree_Item::Fl_Tree_Item
Fl_Tree_Item(const Fl_Tree_Prefs &prefs)
Constructor.
Definition Fl_Tree_Item.cxx:42
Fl_Tree_Item::label_h
int label_h() const
The item's label height.
Definition Fl_Tree_Item.H:134
Fl_Tree_Item::labelfont
void labelfont(Fl_Font val)
Set item's label font face.
Definition Fl_Tree_Item.H:149
Fl_Tree_Item::label_w
int label_w() const
The item's maximum label width to right edge of Fl_Tree's inner width within scrollbars.
Definition Fl_Tree_Item.H:131
Fl_Tree_Item::labelsize
Fl_Fontsize labelsize() const
Get item's label font size.
Definition Fl_Tree_Item.H:163
Fl_Tree_Item::drawfgcolor
Fl_Color drawfgcolor() const
Returns the recommended foreground color used for drawing this item.
Definition Fl_Tree_Item.cxx:839
Fl_Tree_Item::label_x
int label_x() const
The item's label x position relative to the window.
Definition Fl_Tree_Item.H:124
fl_font
Fl_Font fl_font()
Return the face set by the most recent call to fl_font().
Definition fl_draw.H:811
fl_color
Fl_Color fl_color()
Return the last fl_color() that was set.
Definition fl_draw.H:74
fl_rectf
void fl_rectf(int x, int y, int w, int h)
Color with current color a rectangle that exactly fills the given bounding box.
Definition fl_draw.H:339
fl_draw
void fl_draw(const char *str, int x, int y)
Draw a nul-terminated UTF-8 string starting at the given x, y location.
Definition fl_font.cxx:32
fl_measure
void fl_measure(const char *str, int &x, int &y, int draw_symbols=1)
Measure how wide and tall the string will be when printed by the fl_draw() function with align parame...
Definition fl_draw.cxx:487

You can draw anything you want inside draw_item_content() using any of the fl_draw.H functions, as long as it's within the label's xywh area.

To add instances of your custom item to the tree, you can use:

// Example #1: using add()
MyTreeItem *bart = new MyTreeItem(..); // class derived from Fl_Tree_Item
tree->add("/Simpsons/Bart", bart); // Add item as /Simpsons/Bart
Fl_Tree_Item::tree
const Fl_Tree * tree() const
Return the tree for this item.
Definition Fl_Tree_Item.H:282
Fl_Tree::add
Fl_Tree_Item * add(const char *path, Fl_Tree_Item *newitem=0)
Adds a new item, given a menu style 'path'.
Definition Fl_Tree.cxx:826

..or you can insert or replace existing items:

// Example #2: using replace()
MyTreeItem *marge = new MyTreeItem(..); // class derived from Fl_Tree_Item
item = tree->add("/Simpsons/Marge"); // create item
item->replace(mi); // replace it with our own
Fl_Tree_Item::replace
Fl_Tree_Item * replace(Fl_Tree_Item *new_item)
Replace the current item with a new item.
Definition Fl_Tree_Item.cxx:605

Parameters

  [in] | render | Whether we should render content (1), or just tally the geometry (0). Fl_Tree may want only to find the widest item in the tree for scrollbar calculations.

Returns
  the right-most X coordinate, or 'xmax' of content we drew, i.e. the "scrollable" content. The tree uses the largest xmax to determine the maximum width of the tree's content (needed for e.g. computing the horizontal scrollbar's size).

Version
  1.3.3 ABI feature

## ◆ draw_vertical_connector()

void Fl_Tree_Item::draw_vertical_connector | ( | int | x,
|  | int | y1,
|  | int | y2,
|  | const Fl_Tree_Prefs & | prefs )
| protectedvirtual

Vertical connector line based on preference settings.

This method can be overridden to implement custom connection line drawing.

Parameters

  [in] | x | The x position of the vertical connector
  [in] | y1 | The top of the vertical connector
  [in] | y2 | The bottom of the vertical connector
  [in] | prefs | The Fl_Tree prefs

## ◆ drawbgcolor()

Fl_Color Fl_Tree_Item::drawbgcolor | ( |  | ) | const
| protected

Returns the recommended background color used for drawing this item.

See also
  draw_item_content()

Version
  1.3.3 ABI

## ◆ drawfgcolor()

Fl_Color Fl_Tree_Item::drawfgcolor | ( |  | ) | const
| protected

Returns the recommended foreground color used for drawing this item.

See also
  draw_item_content()

Version
  1.3.3 ABI ABI

## ◆ find_child() [1/2]

int Fl_Tree_Item::find_child | ( | const char * | name | ) |

Return the index of the immediate child of this item that has the label `'name'`.

Returns
  index of found item, or -1 if not found.

Version
  1.3.0 release

## ◆ find_child() [2/2]

int Fl_Tree_Item::find_child | ( | Fl_Tree_Item * | item | ) |

Find the index number for the specified `'item'` in the current item's list of children.

Returns
  the index, or -1 if not found.

## ◆ find_child_item() [1/2]

const Fl_Tree_Item * Fl_Tree_Item::find_child_item | ( | char ** | arr | ) | const

Find child item by descending array `'arr'` of names.

Does not include self in search. Only Fl_Tree should need this method.

Returns
  item, or 0 if not found

Version
  1.3.0 release

## ◆ find_child_item() [2/2]

const Fl_Tree_Item * Fl_Tree_Item::find_child_item | ( | const char * | name | ) | const

Return the /immediate/ child of current item that has the label `'name'`.

Returns
  const found item, or 0 if not found.

Version
  1.3.3

## ◆ find_clicked()

const Fl_Tree_Item * Fl_Tree_Item::find_clicked | ( | const Fl_Tree_Prefs & | prefs,
|  | int | yonly = 0 ) const

Find the item that the last event was over.

If `'yonly'` is 1, only check event's y value, don't care about x.

Parameters

  [in] | prefs | The parent tree's Fl_Tree_Prefs
  [in] | yonly | – 0: check both event's X and Y values. – 1: only check event's Y value, don't care about X.

Returns
  pointer to clicked item, or NULL if none found

Version
  1.3.3 ABI feature

## ◆ find_item()

const Fl_Tree_Item * Fl_Tree_Item::find_item | ( | char ** | names | ) | const

Find item by descending array of `'names'`.

Includes self in search. Only Fl_Tree should need this method. Use Fl_Tree::find_item() instead.

Returns
  const item, or 0 if not found

## ◆ hide_widgets()

void Fl_Tree_Item::hide_widgets | ( |  | ) |
| protected

Internal: Hide the FLTK widget() for this item and all children.

Used by close() to hide widgets.

## ◆ insert()

Fl_Tree_Item * Fl_Tree_Item::insert | ( | const Fl_Tree_Prefs & | prefs,
|  | const char * | new_label,
|  | int | pos = 0 )

Insert a new item named `'new_label'` into current item's children at a specified position `'pos'`.

If `pos` is out of range the new item is

- prepended if `pos` < 0 or
- appended if `pos` > item->children().

Returns
  the new item inserted

See also
  Fl_Tree::insert()

## ◆ insert_above()

Fl_Tree_Item * Fl_Tree_Item::insert_above | ( | const Fl_Tree_Prefs & | prefs,
|  | const char * | new_label )

Insert a new item named `'new_label'` above this item.

Returns
  the new item inserted, or 0 if an error occurred.

## ◆ is_visible_r()

int Fl_Tree_Item::is_visible_r | ( |  | ) | const

See if item and all its parents are open() and visible().

Returns
  1 – item and its parents are open() and visible() 0 – item or one of its parents are either not visible() or close()ed.

## ◆ label()

void Fl_Tree_Item::label | ( | const char * | name | ) |

Set the label to `'name'`.

Makes and manages an internal copy of `'name'`.

## ◆ label_h()

int Fl_Tree_Item::label_h | ( |  | ) | const
| inline

The item's label height.

Version
  1.3.3

## ◆ label_w()

int Fl_Tree_Item::label_w | ( |  | ) | const
| inline

The item's maximum label width to right edge of Fl_Tree's inner width within scrollbars.

Version
  1.3.3

## ◆ label_x()

int Fl_Tree_Item::label_x | ( |  | ) | const
| inline

The item's label x position relative to the window.

Version
  1.3.3

## ◆ label_y()

int Fl_Tree_Item::label_y | ( |  | ) | const
| inline

The item's label y position relative to the window.

Version
  1.3.3

## ◆ labelbgcolor() [1/2]

Fl_Color Fl_Tree_Item::labelbgcolor | ( |  | ) | const
| inline

Return item's label background text color.

If the color is 0xffffffff, the default behavior is the parent tree's bg color will be used. (An overloaded draw_item_content() can override this behavior.)

## ◆ labelbgcolor() [2/2]

void Fl_Tree_Item::labelbgcolor | ( | Fl_Color | val | ) |
| inline

Set item's label background color.

A special case is made for color 0xffffffff which uses the parent tree's bg color.

## ◆ move() [1/2]

int Fl_Tree_Item::move | ( | Fl_Tree_Item * | item,
|  | int | op = 0,
|  | int | pos = 0 )

Move the current item above/below/into the specified `'item'`, where `'op'` determines the type of move:

- 0: move above `'item'` (`'pos'` ignored)
- 1: move below `'item'` (`'pos'` ignored)
- 2: move into `'item'` as a child (at optional position `'pos'`)

..and `'pos'` determines an optional index position after the move.

Returns
  0 on success. a negative number on error:
  - -1: one of the items has no parent
  - -2: item's index could not be determined
  - -3: bad 'op'
  - -4: index range error
  - -5: could not deparent
  - -6: could not reparent at `'pos'`
  - (Other return values reserved for future use.)

See also
  move_above(), move_below(), move_into(), move(int,int)

## ◆ move() [2/2]

int Fl_Tree_Item::move | ( | int | to,
|  | int | from )

Move an item within its parent using index numbers.

Item is moved `'to'` its new position `'from'` its old position.

Returns
  - 0: Success
  - -1: range error (e.g. if `'to'` or `'from'` out of range).
  - (Other return values reserved for future use)

See also
  move_above(), move_below(), move_into(), move(Fl_Tree_Item*,int,int)

## ◆ move_above()

int Fl_Tree_Item::move_above | ( | Fl_Tree_Item * | item | ) |

Move the current item above the specified `'item'`.

This is the equivalent of calling move(item,0,0).

Returns
  0 on success.
  On error returns a negative value; see move(Fl_Tree_Item*,int,int) for possible error codes.

See also
  move_below(), move_into(), move(int,int), move(Fl_Tree_Item*,int,int)

## ◆ move_below()

int Fl_Tree_Item::move_below | ( | Fl_Tree_Item * | item | ) |

Move the current item below the specified `'item'`.

This is the equivalent of calling move(item,1,0).

Returns
  0 on success.
  On error returns a negative value; see move(Fl_Tree_Item*,int,int) for possible error codes.

See also
  move_above(), move_into(), move(int,int), move(Fl_Tree_Item*,int,int)

## ◆ move_into()

int Fl_Tree_Item::move_into | ( | Fl_Tree_Item * | item,
|  | int | pos = 0 )

Parent the current item as a child of the specified `'item'`.

This is the equivalent of calling move(item,2,pos).

Returns
  0 on success.
  On error returns a negative value; see move(Fl_Tree_Item*,int,int) for possible error codes.

See also
  move_above(), move_below(), move(int,int), move(Fl_Tree_Item*,int,int)

## ◆ next()

Fl_Tree_Item * Fl_Tree_Item::next | ( |  | ) |

Return the next item in the tree.

This method can be used to walk the tree forward. For an example of how to use this method, see Fl_Tree::first().

Returns
  the next item in the tree, or 0 if there's no more items.

## ◆ next_displayed()

Fl_Tree_Item * Fl_Tree_Item::next_displayed | ( | Fl_Tree_Prefs & | prefs | ) |

Same as next_visible().

Deprecated
  in 1.3.3 for confusing name, use next_visible() instead

## ◆ next_sibling()

Fl_Tree_Item * Fl_Tree_Item::next_sibling | ( |  | ) |

Return this item's next sibling.

Moves to the next item below us at the same level (sibling). Use this to move down the tree without changing depth(). effectively skipping over this item's children/descendents.

Returns
  item's next sibling, or 0 if none.

## ◆ next_visible()

Fl_Tree_Item * Fl_Tree_Item::next_visible | ( | Fl_Tree_Prefs & | prefs | ) |

Return the next open(), visible() item.

(If this item has children and is closed, children are skipped)

This method can be used to walk the tree forward, skipping items that are not currently open/visible to the user.

Returns
  the next open() visible() item below us, or 0 if there's no more items.

Version
  1.3.3

## ◆ parent()

void Fl_Tree_Item::parent | ( | Fl_Tree_Item * | val | ) |
| inline

Set the parent for this item.

Should only be used by Fl_Tree's internals.

## ◆ prefs()

const Fl_Tree_Prefs & Fl_Tree_Item::prefs | ( |  | ) | const

Return the parent tree's prefs.

Returns
  a reference to the parent tree's Fl_Tree_Prefs

Version
  1.3.3 ABI feature

## ◆ prev()

Fl_Tree_Item * Fl_Tree_Item::prev | ( |  | ) |

Return the previous item in the tree.

This method can be used to walk the tree backwards. For an example of how to use this method, see Fl_Tree::last().

Returns
  the previous item in the tree, or 0 if there's no item above this one (hit the root).

## ◆ prev_displayed()

Fl_Tree_Item * Fl_Tree_Item::prev_displayed | ( | Fl_Tree_Prefs & | prefs | ) |

Same as prev_visible().

Deprecated
  in 1.3.3 for confusing name, use prev_visible()

## ◆ prev_sibling()

Fl_Tree_Item * Fl_Tree_Item::prev_sibling | ( |  | ) |

Return this item's previous sibling.

Moves to the previous item above us at the same level (sibling). Use this to move up the tree without changing depth().

Returns
  This item's previous sibling, or 0 if none.

## ◆ prev_visible()

Fl_Tree_Item * Fl_Tree_Item::prev_visible | ( | Fl_Tree_Prefs & | prefs | ) |

Return the previous open(), visible() item.

(If this item above us has children and is closed, its children are skipped)

This method can be used to walk the tree backward, skipping items that are not currently open/visible to the user.

Returns
  the previous open() visible() item above us, or 0 if there's no more items.

## ◆ recalc_tree()

void Fl_Tree_Item::recalc_tree | ( |  | ) |
| protected

Call this when our geometry is changed.

(Font size, label contents, etc) Schedules tree to recalculate itself, as changes to us may affect tree widget's scrollbar visibility and tab sizes.

Version
  1.3.3 ABI

## ◆ remove_child() [1/2]

int Fl_Tree_Item::remove_child | ( | const char * | name | ) |

Remove immediate child (and its children) by its label `'name'`.

If more than one item matches `'name'`, only the first matching item is removed.

Parameters

  [in] | name | The label name of the immediate child to remove

Returns
  0 if removed, -1 if not found.

Version
  1.3.3

## ◆ remove_child() [2/2]

int Fl_Tree_Item::remove_child | ( | Fl_Tree_Item * | item | ) |

Remove `'item'` from the current item's children.

Returns
  0 if removed, -1 if item not an immediate child.

## ◆ reparent()

int Fl_Tree_Item::reparent | ( | Fl_Tree_Item * | newchild,
|  | int | pos )

Reparent specified item as a child of ourself at position `'pos'`.

Typically `'newchild'` was recently orphaned with deparent().

Returns
  - 0: on success
  - -1: on error (e.g. if `'pos'` out of range) with no changes made.

See also
  deparent()

## ◆ replace()

Fl_Tree_Item * Fl_Tree_Item::replace | ( | Fl_Tree_Item * | newitem | ) |

Replace the current item with a new item.

The current item is destroyed if successful. No checks are made to see if an item with the same name exists.

This method can be used to, for example, install 'custom' items into the tree derived from Fl_Tree_Item; see draw_item_content().

Parameters

  [in] | newitem | The new item to replace the current item

Returns
  newitem on success, NULL if could not be replaced.

See also
  Fl_Tree_Item::draw_item_content(), Fl_Tree::root(Fl_Tree_Item*)

Version
  1.3.3 ABI feature

## ◆ replace_child()

Fl_Tree_Item * Fl_Tree_Item::replace_child | ( | Fl_Tree_Item * | olditem,
|  | Fl_Tree_Item * | newitem )

Replace existing child `'olditem'` with `'newitem'`.

The `'olditem'` is destroyed if successful. Can be used to put custom items (derived from Fl_Tree_Item) into the tree. No checks are made to see if an item with the same name exists.

Parameters

  [in] | olditem | The item to be found and replaced
  [in] | newitem | The new item to take the place of `'olditem'`

Returns
  newitem on success and `'olditem'` is destroyed. NULL on error if `'olditem'` was not found as an immediate child.

See also
  replace(), Fl_Tree_Item::draw()

Version
  1.3.3 ABI feature

## ◆ select()

void Fl_Tree_Item::select | ( | int | val = 1 | ) |
| inline

Change the item's selection state to the optionally specified 'val'.

If 'val' is not specified, the item will be selected.

## ◆ select_all()

int Fl_Tree_Item::select_all | ( |  | ) |
| inline

Select item and all its children.

Returns count of how many items were in the 'deselected' state, ie. how many items were "changed".

## ◆ show_self()

void Fl_Tree_Item::show_self | ( | const char * | indent = "" | ) | const

Print the tree as 'ascii art' to stdout.

Used mainly for debugging.

## ◆ show_widgets()

void Fl_Tree_Item::show_widgets | ( |  | ) |
| protected

Internal: Show the FLTK widget() for this item and all children.

Used by open() to re-show widgets that were hidden by a previous close()

## ◆ swap_children() [1/2]

int Fl_Tree_Item::swap_children | ( | Fl_Tree_Item * | a,
|  | Fl_Tree_Item * | b )

Swap two of our immediate children, given item pointers.

Use e.g. for sorting.

This method is SLOW because it involves linear lookups.
For speed, use swap_children(int,int) instead.

Parameters

  [in] | a,b | The item ptrs of the two items to swap. Both must be immediate children of the current item.

Returns
  - 0 : OK
  - -1 : failed: item `'a'` or `'b'` is not our child.

## ◆ swap_children() [2/2]

void Fl_Tree_Item::swap_children | ( | int | ax,
|  | int | bx )

Swap two of our children, given two child index values `'ax'` and `'bx'`.

Use e.g. for sorting.
This method is FAST, and does not involve lookups.
No range checking is done on either index value.

Parameters

  [in] | ax,bx | the index of the items to swap

## ◆ tree() [1/2]

Fl_Tree * Fl_Tree_Item::tree | ( |  | ) |
| inline

Return the tree for this item.

Version
  1.3.4

## ◆ tree() [2/2]

const Fl_Tree * Fl_Tree_Item::tree | ( |  | ) | const
| inline

Return the tree for this item.

Version
  1.3.3

## ◆ update_prev_next()

void Fl_Tree_Item::update_prev_next | ( | int | index | ) |

Update our _prev_sibling and _next_sibling pointers to point to neighbors given `index` as being our current position in the parent's item array.

Call this whenever items in the array are added/removed/moved/swapped/etc.

Parameters

  [in] | index | Our index# in the parent. Special case if index=-1: become an orphan; null out all parent/sibling associations.

## ◆ userdeicon() [1/2]

Fl_Image * Fl_Tree_Item::userdeicon | ( |  | ) | const
| inline

Return the deactivated version of the user icon, if any.

Returns 0 if none.

## ◆ userdeicon() [2/2]

void Fl_Tree_Item::userdeicon | ( | Fl_Image * | val | ) |
| inline

Set the usericon to draw when the item is deactivated.

Use '0' to disable. No internal copy is made; caller must manage icon's memory.

To create a typical 'grayed out' version of your usericon image, you can do the following:

// Create tree + usericon for items
Fl_Tree *tree = new Fl_Tree(..);
Fl_Image *usr_icon = new Fl_Pixmap(..); // your usericon
Fl_Image *de_icon = usr_icon->copy(); // make a copy, and..
de_icon->inactive(); // make it 'grayed out'
...
for ( .. ) { // item loop..
item = tree->add("..."); // create new item
item->usericon(usr_icon); // assign usericon to items
item->userdeicon(de_icon); // assign userdeicon to items
..
}
Fl_Image
Base class for image caching, scaling and drawing.
Definition Fl_Image.H:60
Fl_Image::copy
virtual Fl_Image * copy(int W, int H) const
Creates a resized copy of the image.
Definition Fl_Image.cxx:115
Fl_Image::inactive
void inactive()
The inactive() method calls color_average(FL_BACKGROUND_COLOR, 0.33f) to produce an image that appear...
Definition Fl_Image.H:279
Fl_Pixmap::Fl_Pixmap
Fl_Pixmap(char *const *D)
The constructors create a new pixmap from the specified XPM data.
Definition Fl_Pixmap.H:58
Fl_Tree_Item::usericon
void usericon(Fl_Image *val)
Set the item's user icon to an Fl_Image.
Definition Fl_Tree_Item.H:420
Fl_Tree
Tree widget.
Definition Fl_Tree.H:286
Fl_Tree::Fl_Tree
Fl_Tree(int X, int Y, int W, int H, const char *L=0)
Constructor.
Definition Fl_Tree.cxx:78

In the above example, the app should 'delete' the two icons when they're no longer needed (e.g. after the tree is destroyed)

Version
  1.3.4

## ◆ usericon()

void Fl_Tree_Item::usericon | ( | Fl_Image * | val | ) |
| inline

Set the item's user icon to an Fl_Image.

Use '0' to disable. No internal copy is made, caller must manage icon's memory.

Note, if you expect your items to be deactivated(), use userdeicon(Fl_Image*) to set up a 'grayed out' version of your icon to be used for display.

See also
  userdeicon(Fl_Image*)

## ◆ visible_r()

int Fl_Tree_Item::visible_r | ( |  | ) | const
| inline

See if item and all its parents are open() and visible().

Alias for is_visible_r().

Returns
  1 – item and its parents are open() and visible() 0 – item (or one of its parents) are not visible or close()ed.

The documentation for this class was generated from the following files:

- Fl_Tree_Item.H
- Fl_Tree_Item.cxx