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# Gtk::TreeViewColumn Class Reference
[TreeView Classes]

Typedefed as Gtk::TreeView::Column. More...

Inheritance diagram for Gtk::TreeViewColumn:

[legend]
List of all members.

## Public Types
typedef TreeViewColumn | Column
typedef SigC::Slot2< void, CellRenderer*, const Gtk::TreeModel::iterator& > | SlotCellData
## Public Methods
virtual | ~TreeViewColumn ()
GtkTreeViewColumn* | gobj ()
| Provides access to the underlying C GtkObject.
const GtkTreeViewColumn* | gobj () const
| Provides access to the underlying C GtkObject.
| TreeViewColumn ()
| TreeViewColumn (const Glib::ustring& title)
| TreeViewColumn (const Glib::ustring& title, CellRenderer& cell)
template <class T_ModelColumnType> | TreeViewColumn (const Glib::ustring& title, const TreeModelColumn<T_ModelColumnType>& column)
| Create a default view column for the given model column type.
void | pack_start (CellRenderer& cell, bool expand=true)
| Packs the cell into the beginning of the column.
void | pack_end (CellRenderer& cell, bool expand=true)
| Adds the cell to end of the column.
template <class T_ModelColumnType> void | pack_start (const TreeModelColumn<T_ModelColumnType>& column, bool expand=true)
template <class T_ModelColumnType> void | pack_end (const TreeModelColumn<T_ModelColumnType>& column, bool expand=true)
void | clear ()
| Unsets all the mappings on all renderers on the tree_column .
CellRenderer* | get_first_cell_renderer ()
| Gets the CellRenderer for the column.
const CellRenderer* | get_first_cell_renderer () const
| Gets the CellRenderer for the column.
Glib::ListHandle<CellRenderer*> | get_cell_renderers ()
| Returns a list of all the cell renderers in the column, in no particular order.
Glib::ListHandle<const CellRenderer*> | get_cell_renderers () const
| Returns a list of all the cell renderers in the column, in no particular order.
void | add_attribute (CellRenderer& cell_renderer, const Glib::ustring& attribute, int column)
| Adds an attribute mapping to the list in tree_column .
void | add_attribute (const Glib::PropertyProxy_Base& property, const TreeModelColumnBase& column)
void | set_renderer (Gtk::CellRenderer& renderer, const TreeModelColumnBase& column)
void | set_cell_data_func (CellRenderer& cell_renderer, const SlotCellData& slot)
void | unset_cell_data_func (CellRenderer& cell_renderer)
void | clear_attributes (CellRenderer& cell_renderer)
| Clears all existing attributes previously set with set_attributes().
void | set_spacing (int spacing)
| Sets the spacing field of tree_column , which is the number of pixels to place between cell renderers packed into it.
int | get_spacing () const
| Returns the spacing of tree_column .
void | set_visible (bool visible=true)
| Sets the visibility of tree_column .
bool | get_visible () const
| Returns `true` if tree_column is visible.
void | set_resizable (bool resizable=true)
| If resizable is `true`, then the user can explicitly resize the column by grabbing the outer edge of the column button.
bool | get_resizable () const
| Returns #`true` if the tree_column can be resized by the end user.
void | set_sizing (TreeViewColumnSizing type)
| Sets the growth behavior of tree_column to type .
TreeViewColumnSizing | get_sizing ()
| Returns the current type of tree_column .
int | get_width () const
| Returns the current size of tree_column in pixels.
int | get_fixed_width () const
| Gets the fixed width of the column.
void | set_fixed_width (int fixed_width)
| Sets the size of the column in pixels.
void | set_min_width (int min_width)
| Sets the minimum width of the tree_column .
int | get_min_width () const
| Returns the minimum width in pixels of the tree_column , or -1 if no minimum width is set.
void | set_max_width (int max_width)
| Sets the maximum width of the tree_column .
int | get_max_width () const
| Returns the maximum width in pixels of the tree_column , or -1 if no maximum width is set.
void | clicked ()
| Emits the "clicked" signal on the column.
void | set_title (const Glib::ustring& title)
| Sets the title of the tree_column .
Glib::ustring | get_title () const
| Returns the title of the widget.
void | set_clickable (bool clickable=true)
| Sets the header to be active if active is `true`.
bool | get_clickable () const
| Returns `true` if the user can click on the header for the column.
void | set_widget (Gtk::Widget& widget)
| Sets the widget in the header to be widget .
Widget* | get_widget ()
| Returns the Gtk::Widget in the button on the column header.
const Widget* | get_widget () const
| Returns the Gtk::Widget in the button on the column header.
void | set_alignment (float xalign)
| Sets the alignment of the title or custom widget inside the column header.
void | set_alignment (AlignmentEnum xalign)
| Sets the alignment of the title or custom widget inside the column header.
float | get_alignment () const
| Returns the current x alignment of tree_column .
void | set_reorderable (bool reorderable=true)
| If reorderable is #`true`, then the column can be reordered by the end user dragging the header.
bool | get_reorderable () const
| Returns #`true` if the tree_column can be reordered by the user.
void | set_sort_column_id (const TreeModelColumnBase& sort_column_id)
| Sets the logical sort_column_id that this column sorts on when this column is selected for sorting.
void | set_sort_column_id (int sort_column_id)
| Sets the logical sort_column_id that this column sorts on when this column is selected for sorting.
int | get_sort_column_id () const
| Gets the logical sort_column_id that the model sorts on when this column is selected for sorting.
void | set_sort_indicator (bool setting)
| Call this function with a setting of `true` to display an arrow in the header button indicating the column is sorted.
bool | get_sort_indicator () const
| Gets the value set by set_sort_indicator().
void | set_sort_order (SortType order)
| Changes the appearance of the sort indicator.
SortType | get_sort_order () const
| Gets the value set by set_sort_order().
void | cell_set_cell_data (const Glib::RefPtr<TreeModel>& tree_model, const TreeModel::iterator& iter, bool is_expander, bool is_expanded)
| Sets the cell renderer based on the tree_model and iter .
void | cell_get_size (Gdk::Rectangle& cell_area, int& x_offset, int& y_offset, int& width, int& height) const
| Obtains the width and height needed to render the column.
bool | cell_is_visible () const
| Returns #`true` if any of the cells packed into the tree_column are visible.
void | focus_cell (CellRenderer& cell)
| Sets the current keyboard focus to be at cell , if the column contains 2 or more editable and activatable cells.
Glib::SignalProxy0<void> | signal_clicked ()
Glib::PropertyProxy<bool> | property_visible ()
Glib::PropertyProxy_ReadOnly< int > | property_width ()
Glib::PropertyProxy<TreeViewColumnSizing> | property_sizing ()
Glib::PropertyProxy<int> | property_fixed_width ()
Glib::PropertyProxy<int> | property_min_width ()
Glib::PropertyProxy<int> | property_max_width ()
Glib::PropertyProxy<Glib::ustring> | property_title ()
Glib::PropertyProxy<bool> | property_clickable ()
Glib::PropertyProxy<Widget*> | property_widget ()
Glib::PropertyProxy<float> | property_alignment ()
Glib::PropertyProxy<bool> | property_reorderable ()
Glib::PropertyProxy<bool> | property_sort_indicator ()
Glib::PropertyProxy<SortType> | property_sort_order ()
## Protected Methods
virtual void | on_clicked ()
## Related Functions
(Note that these are not member functions.)
Gtk::TreeViewColumn* | wrap (GtkTreeViewColumn* object, bool take_copy=false)

## Detailed Description

Typedefed as Gtk::TreeView::Column.

This is a visible column in a Gtk::TreeView widget. It determines the geometry, type.

## Member Typedef Documentation

typedef TreeViewColumn Gtk::TreeViewColumn::Column

typedef SigC::Slot2<void, CellRenderer*, const Gtk::TreeModel::iterator&> Gtk::TreeViewColumn::SlotCellData

## Constructor & Destructor Documentation

virtual Gtk::TreeViewColumn::~TreeViewColumn | ( |  | ) | `[virtual]`

Gtk::TreeViewColumn::TreeViewColumn | ( |  | ) |

Gtk::TreeViewColumn::TreeViewColumn | ( | const Glib::ustring& | title | ) | `[explicit]`

Gtk::TreeViewColumn::TreeViewColumn | ( | const Glib::ustring& | title,
|  | CellRenderer& | cell
| ) |

template <class T_ModelColumnType>
Gtk::TreeViewColumn::TreeViewColumn | ( | const Glib::ustring& | title,
|  | const TreeModelColumn<T_ModelColumnType>& | column
| ) |

| Create a default view column for the given model column type.

## Member Function Documentation

void Gtk::TreeViewColumn::add_attribute | ( | const Glib::PropertyProxy_Base& | property,
|  | const TreeModelColumnBase& | column
| ) |

void Gtk::TreeViewColumn::add_attribute | ( | CellRenderer& | cell_renderer,
|  | const Glib::ustring& | attribute,
|  | int | column
| ) |

  | Adds an attribute mapping to the list in tree_column . The column is the column of the model to get a value from, and the attribute is the parameter on cell_renderer to be set from the value. So for example if column 2 of the model contains strings, you could have the "text" attribute of a Gtk::CellRendererText get its values from column 2. Parameters:
  cell_renderer | The Gtk::CellRenderer to set attributes on.
  attribute | An attribute on the renderer.
  column | The column position on the model to get the attribute from.

void Gtk::TreeViewColumn::cell_get_size | ( | Gdk::Rectangle& | cell_area,
|  | int& | x_offset,
|  | int& | y_offset,
|  | int& | width,
|  | int& | height
| ) | const

  | Obtains the width and height needed to render the column. This is used primarily by the Gtk::TreeView. Parameters:
  cell_area | The area a cell in the column will be allocated, or `0`.
  x_offset | Location to return x offset of a cell relative to cell_area , or `0`.
  y_offset | Location to return y offset of a cell relative to cell_area , or `0`.
  width | Location to return width needed to render a cell, or `0`.
  height | Location to return height needed to render a cell, or `0`.

bool Gtk::TreeViewColumn::cell_is_visible | ( |  | ) |

| Returns #`true` if any of the cells packed into the tree_column are visible. For this to be meaningful, you must first initialize the cells with cell_set_cell_data() Returns: #`true`, if any of the cells packed into the tree_column are currently visible.

void Gtk::TreeViewColumn::cell_set_cell_data | ( | const Glib::RefPtr<TreeModel>& | tree_model,
|  | const TreeModel::iterator& | iter,
|  | bool | is_expander,
|  | bool | is_expanded
| ) |

  | Sets the cell renderer based on the tree_model and iter . That is, for every attribute mapping in tree_column , it will get a value from the set column on the iter , and use that value to set the attribute on the cell renderer. This is used primarily by the Gtk::TreeView. Parameters:
  tree_model | The Gtk::TreeModel to to get the cell renderers attributes from.
  iter | The Gtk::TreeIter to to get the cell renderer's attributes from.
  is_expander | `true`, if the row has children.
  is_expanded | `true`, if the row has visible children.

void Gtk::TreeViewColumn::clear | ( |  | ) |

| Unsets all the mappings on all renderers on the tree_column .

void Gtk::TreeViewColumn::clear_attributes | ( | CellRenderer& | cell_renderer | ) |

  | Clears all existing attributes previously set with set_attributes(). Parameters:
  cell_renderer | A Gtk::CellRenderer to clear the attribute mapping on.

void Gtk::TreeViewColumn::clicked | ( |  | ) |

| Emits the "clicked" signal on the column. This function will only work if tree_column is clickable.

void Gtk::TreeViewColumn::focus_cell | ( | CellRenderer& | cell | ) |

  | Sets the current keyboard focus to be at cell , if the column contains 2 or more editable and activatable cells. Since: 2.2 Parameters:
  cell | A Gtk::CellRenderer.

float Gtk::TreeViewColumn::get_alignment | ( |  | ) |

| Returns the current x alignment of tree_column . This value can range between 0.0 and 1.0. Returns: The current alignent of tree_column .

Glib::ListHandle<const CellRenderer*> Gtk::TreeViewColumn::get_cell_renderers | ( |  | ) |

| Returns a list of all the cell renderers in the column, in no particular order. Returns: A list of Gtk::CellRenderers.

Glib::ListHandle<CellRenderer*> Gtk::TreeViewColumn::get_cell_renderers | ( |  | ) |

| Returns a list of all the cell renderers in the column, in no particular order. Returns: A list of Gtk::CellRenderers.

bool Gtk::TreeViewColumn::get_clickable | ( |  | ) |

| Returns `true` if the user can click on the header for the column. Returns: `true` if user can click the column header.

const CellRenderer* Gtk::TreeViewColumn::get_first_cell_renderer | ( |  | ) |

| Gets the CellRenderer for the column. You should dynamic_cast<> to the expected derived CellRenderer type. This assumes that the TreeViewColumn contains only one CellRenderer.

CellRenderer* Gtk::TreeViewColumn::get_first_cell_renderer | ( |  | ) |

| Gets the CellRenderer for the column. You should dynamic_cast<> to the expected derived CellRenderer type. This assumes that the TreeViewColumn contains only one CellRenderer.

int Gtk::TreeViewColumn::get_fixed_width | ( |  | ) |

| Gets the fixed width of the column. This value is only meaning may not be the actual width of the column on the screen, just what is requested. Returns: The fixed width of the column.

int Gtk::TreeViewColumn::get_max_width | ( |  | ) |

| Returns the maximum width in pixels of the tree_column , or -1 if no maximum width is set. Returns: The maximum width of the tree_column .

int Gtk::TreeViewColumn::get_min_width | ( |  | ) |

| Returns the minimum width in pixels of the tree_column , or -1 if no minimum width is set. Returns: The minimum width of the tree_column .

bool Gtk::TreeViewColumn::get_reorderable | ( |  | ) |

| Returns #`true` if the tree_column can be reordered by the user. Returns: #`true` if the tree_column can be reordered by the user.

bool Gtk::TreeViewColumn::get_resizable | ( |  | ) |

| Returns #`true` if the tree_column can be resized by the end user. Returns: #`true`, if the tree_column can be resized.

TreeViewColumnSizing Gtk::TreeViewColumn::get_sizing | ( |  | ) |

| Returns the current type of tree_column . Returns: The type of tree_column .

int Gtk::TreeViewColumn::get_sort_column_id | ( |  | ) |

| Gets the logical sort_column_id that the model sorts on when this column is selected for sorting. See set_sort_column_id(). Returns: The current sort_column_id for this column, or -1 if this column can't be used for sorting.

bool Gtk::TreeViewColumn::get_sort_indicator | ( |  | ) |

| Gets the value set by set_sort_indicator(). Returns: Whether the sort indicator arrow is displayed.

SortType Gtk::TreeViewColumn::get_sort_order | ( |  | ) |

| Gets the value set by set_sort_order(). Returns: The sort order the sort indicator is indicating.

int Gtk::TreeViewColumn::get_spacing | ( |  | ) |

| Returns the spacing of tree_column . Returns: The spacing of tree_column .

Glib::ustring Gtk::TreeViewColumn::get_title | ( |  | ) |

| Returns the title of the widget. Returns: The title of the column. This string should not be modified or freed.

bool Gtk::TreeViewColumn::get_visible | ( |  | ) |

| Returns `true` if tree_column is visible. Returns: Whether the column is visible or not. If it is visible, then the tree will show the column.

const Widget* Gtk::TreeViewColumn::get_widget | ( |  | ) |

| Returns the Gtk::Widget in the button on the column header. If a custom widget has not been set then `0` is returned. Returns: The Gtk::Widget in the column header, or `0`.

Widget* Gtk::TreeViewColumn::get_widget | ( |  | ) |

| Returns the Gtk::Widget in the button on the column header. If a custom widget has not been set then `0` is returned. Returns: The Gtk::Widget in the column header, or `0`.

int Gtk::TreeViewColumn::get_width | ( |  | ) |

| Returns the current size of tree_column in pixels. Returns: The current width of tree_column .

const GtkTreeViewColumn* Gtk::TreeViewColumn::gobj | ( |  | ) | const`[inline]`

| Provides access to the underlying C GtkObject. Reimplemented from Gtk::Object.

GtkTreeViewColumn* Gtk::TreeViewColumn::gobj | ( |  | ) | `[inline]`

| Provides access to the underlying C GtkObject. Reimplemented from Gtk::Object.

virtual void Gtk::TreeViewColumn::on_clicked | ( |  | ) | `[protected, virtual]`

template <class T_ModelColumnType>
void Gtk::TreeViewColumn::pack_end | ( | const TreeModelColumn<T_ModelColumnType>& | column,
|  | bool | expand = true
| ) |

void Gtk::TreeViewColumn::pack_end | ( | CellRenderer& | cell,
|  | bool | expand = true
| ) |

  | Adds the cell to end of the column. If expand is `false`, then the cell is allocated no more space than it needs. Any unused space is divided evenly between cells for which expand is `true`. Parameters:
  cell | The Gtk::CellRenderer.
  expand | `true` if cell is to be given extra space allocated to box.

template <class T_ModelColumnType>
void Gtk::TreeViewColumn::pack_start | ( | const TreeModelColumn<T_ModelColumnType>& | column,
|  | bool | expand = true
| ) |

void Gtk::TreeViewColumn::pack_start | ( | CellRenderer& | cell,
|  | bool | expand = true
| ) |

  | Packs the cell into the beginning of the column. If expand is `false`, then the cell is allocated no more space than it needs. Any unused space is divided evenly between cells for which expand is `true`. Parameters:
  cell | The Gtk::CellRenderer.
  expand | `true` if cell is to be given extra space allocated to box.

Glib::PropertyProxy<float> Gtk::TreeViewColumn::property_alignment | ( |  | ) |

Glib::PropertyProxy<bool> Gtk::TreeViewColumn::property_clickable | ( |  | ) |

Glib::PropertyProxy<int> Gtk::TreeViewColumn::property_fixed_width | ( |  | ) |

Glib::PropertyProxy<int> Gtk::TreeViewColumn::property_max_width | ( |  | ) |

Glib::PropertyProxy<int> Gtk::TreeViewColumn::property_min_width | ( |  | ) |

Glib::PropertyProxy<bool> Gtk::TreeViewColumn::property_reorderable | ( |  | ) |

Glib::PropertyProxy<TreeViewColumnSizing> Gtk::TreeViewColumn::property_sizing | ( |  | ) |

Glib::PropertyProxy<bool> Gtk::TreeViewColumn::property_sort_indicator | ( |  | ) |

Glib::PropertyProxy<SortType> Gtk::TreeViewColumn::property_sort_order | ( |  | ) |

Glib::PropertyProxy<Glib::ustring> Gtk::TreeViewColumn::property_title | ( |  | ) |

Glib::PropertyProxy<bool> Gtk::TreeViewColumn::property_visible | ( |  | ) |

Glib::PropertyProxy<Widget*> Gtk::TreeViewColumn::property_widget | ( |  | ) |

Glib::PropertyProxy_ReadOnly<int> Gtk::TreeViewColumn::property_width | ( |  | ) |

void Gtk::TreeViewColumn::set_alignment | ( | AlignmentEnum | xalign | ) |

  | Sets the alignment of the title or custom widget inside the column header. The alignment determines its location inside the button -- 0.0 for left, 0.5 for center, 1.0 for right. Parameters:
  xalign | The alignment, which is between [0.0 and 1.0] inclusive.

void Gtk::TreeViewColumn::set_alignment | ( | float | xalign | ) |

  | Sets the alignment of the title or custom widget inside the column header. The alignment determines its location inside the button -- 0.0 for left, 0.5 for center, 1.0 for right. Parameters:
  xalign | The alignment, which is between [0.0 and 1.0] inclusive.

void Gtk::TreeViewColumn::set_cell_data_func | ( | CellRenderer& | cell_renderer,
|  | const SlotCellData& | slot
| ) |

void Gtk::TreeViewColumn::set_clickable | ( | bool | clickable = true | ) |

  | Sets the header to be active if active is `true`. When the header is active, then it can take keyboard focus, and can be clicked. Parameters:
  clickable | `true` if the header is active.

void Gtk::TreeViewColumn::set_fixed_width | ( | int | fixed_width | ) |

  | Sets the size of the column in pixels. This is meaningful only if the sizing type is Gtk::TREE_VIEW_COLUMN_FIXED. The size of the column is clamped to the min/max width for the column. Please note that the min/max width of the column doesn't actually affect the "fixed_width" property of the widget, just the actual size when displayed. Parameters:
  fixed_width | The size to set tree_column to. Must be greater than 0.

void Gtk::TreeViewColumn::set_max_width | ( | int | max_width | ) |

  | Sets the maximum width of the tree_column . If max_width is -1, then the maximum width is unset. Note, the column can actually be wider than max width if it's the last column in a view. In this case, the column expands to fill any extra space. Parameters:
  max_width | The maximum width of the column in pixels, or -1.

void Gtk::TreeViewColumn::set_min_width | ( | int | min_width | ) |

  | Sets the minimum width of the tree_column . If min_width is -1, then the minimum width is unset. Parameters:
  min_width | The minimum width of the column in pixels, or -1.

void Gtk::TreeViewColumn::set_renderer | ( | Gtk::CellRenderer& | renderer,
|  | const TreeModelColumnBase& | column
| ) |

void Gtk::TreeViewColumn::set_reorderable | ( | bool | reorderable = true | ) |

  | If reorderable is #`true`, then the column can be reordered by the end user dragging the header. Parameters:
  reorderable | #`true`, if the column can be reordered.

void Gtk::TreeViewColumn::set_resizable | ( | bool | resizable = true | ) |

  | If resizable is `true`, then the user can explicitly resize the column by grabbing the outer edge of the column button. If resizable is `true` and sizing mode of the column is Gtk::TREE_VIEW_COLUMN_AUTOSIZE, then the sizing mode is changed to Gtk::TREE_VIEW_COLUMN_GROW_ONLY. Parameters:
  resizable | `true`, if the column can be resized.

void Gtk::TreeViewColumn::set_sizing | ( | TreeViewColumnSizing | type | ) |

  | Sets the growth behavior of tree_column to type . Parameters:
  type | The Gtk::TreeViewColumnSizing.

void Gtk::TreeViewColumn::set_sort_column_id | ( | int | sort_column_id | ) |

  | Sets the logical sort_column_id that this column sorts on when this column is selected for sorting. Doing so makes the column header clickable. Parameters:
  sort_column_id | The sort_column_id of the model to sort on.

void Gtk::TreeViewColumn::set_sort_column_id | ( | const TreeModelColumnBase& | sort_column_id | ) |

  | Sets the logical sort_column_id that this column sorts on when this column is selected for sorting. Doing so makes the column header clickable. Parameters:
  sort_column_id | The sort_column_id of the model to sort on.

void Gtk::TreeViewColumn::set_sort_indicator | ( | bool | setting | ) |

  | Call this function with a setting of `true` to display an arrow in the header button indicating the column is sorted. Call set_sort_order() to change the direction of the arrow. Parameters:
  setting | `true` to display an indicator that the column is sorted.

void Gtk::TreeViewColumn::set_sort_order | ( | SortType | order | ) |

  | Changes the appearance of the sort indicator. This does not actually sort the model. Use set_sort_column_id() if you want automatic sorting support. This function is primarily for custom sorting behavior, and should be used in conjunction with gtk_tree_sortable_set_sort_column() to do that. For custom models, the mechanism will vary. The sort indicator changes direction to indicate normal sort or reverse sort. Note that you must have the sort indicator enabled to see anything when calling this function; see set_sort_indicator(). Parameters:
  order | Sort order that the sort indicator should indicate.

void Gtk::TreeViewColumn::set_spacing | ( | int | spacing | ) |

  | Sets the spacing field of tree_column , which is the number of pixels to place between cell renderers packed into it. Parameters:
  spacing | Distance between cell renderers in pixels.

void Gtk::TreeViewColumn::set_title | ( | const Glib::ustring& | title | ) |

  | Sets the title of the tree_column . If a custom widget has been set, then this value is ignored. Parameters:
  title | The title of the tree_column .

void Gtk::TreeViewColumn::set_visible | ( | bool | visible = true | ) |

  | Sets the visibility of tree_column . Parameters:
  visible | `true` if the tree_column is visible.

void Gtk::TreeViewColumn::set_widget | ( | Gtk::Widget& | widget | ) |

  | Sets the widget in the header to be widget . If widget is `0`, then the header button is set with a Gtk::Label set to the title of tree_column . Parameters:
  widget | A child Gtk::Widget, or `0`.

Glib::SignalProxy0<void> Gtk::TreeViewColumn::signal_clicked | ( |  | ) |

| Prototype: `void clicked()`

void Gtk::TreeViewColumn::unset_cell_data_func | ( | CellRenderer& | cell_renderer | ) |

## Friends And Related Function Documentation

Gtk::TreeViewColumn* wrap | ( | GtkTreeViewColumn* | object,
|  | bool | take_copy = false
| ) | `[related]`

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

- treeviewcolumn.h