/////////////////////////////////////////////////////////////////////////////// // Name: interface/wx/treelist.h // Purpose: wxTreeListCtrl class documentation // Author: Vadim Zeitlin // Created: 2011-08-17 // RCS-ID: $Id$ // Copyright: (c) 2011 Vadim Zeitlin // Licence: wxWindows licence /////////////////////////////////////////////////////////////////////////////// /** Unique identifier of an item in wxTreeListCtrl. This is an opaque class which can't be used by the application in any other way than receiving or passing it to wxTreeListCtrl and checking for validity. @see wxTreeListCtrl @library{wxadv} @category{ctrl} @since 2.9.3 */ class wxTreeListItem { public: /** Only the default constructor is publicly accessible. Default constructing a wxTreeListItem creates an invalid item. */ wxTreeListItem(); /** Return true if the item is valid. */ bool IsOk() const; }; /** Class defining sort order for the items in wxTreeListCtrl. @see wxTreeListCtrl @library{wxadv} @category{ctrl} @since 2.9.3 */ class wxTreeListItemComparator { public: /** Default constructor. Notice that this class is not copyable, comparators are not passed by value. */ wxTreeListItemComparator(); /** Pure virtual function which must be overridden to define sort order. The comparison function should return negative, null or positive value depending on whether the first item is less than, equal to or greater than the second one. The items should be compared using their values for the given column. @param treelist The control whose contents is being sorted. @param column The column of this control used for sorting. @param first First item to compare. @param second Second item to compare. @return A negative value if the first item is less than (i.e. should appear above) the second one, zero if the two items are equal or a positive value if the first item is greater than (i.e. should appear below) the second one. */ virtual int Compare(wxTreeListCtrl* treelist, unsigned column, wxTreeListItem first, wxTreeListItem second) = 0; /** Trivial but virtual destructor. Although this class is not used polymorphically by wxWidgets itself, provide virtual dtor in case it's used like this in the user code. */ virtual ~wxTreeListItemComparator(); }; /** Container of multiple items. */ typedef wxVector wxTreeListItems; /** Special wxTreeListItem value meaning "insert before the first item". This value can be passed to wxTreeListCtrl::InsertItem() to achieve the same effect as calling wxTreeListCtrl::PrependItem(). */ extern const wxTreeListItem wxTLI_FIRST; /** Special wxTreeListItem value meaning "insert after the last item". This value can be passed to wxTreeListCtrl::InsertItem() to achieve the same effect as calling wxTreeListCtrl::AppendItem(). */ extern const wxTreeListItem wxTLI_LAST; /** A control combining wxTreeCtrl and wxListCtrl features. This is a multi-column tree control optionally supporting images and checkboxes for the items in the first column. It is currently implemented using wxDataViewCtrl internally but provides a much simpler interface for the common use case it addresses. Thus, one of the design principles for this control is simplicity and intentionally doesn't provide all the features of wxDataViewCtrl. Most importantly, this class stores all its data internally and doesn't require you to define a custom model for it. Instead, this controls works like wxTreeCtrl or non-virtual wxListCtrl and allows you to simply add items to it using wxTreeListCtrl::AppendItem() and related methods. Typically, you start by setting up the columns (you must have at least one) by calling wxTreeListCtrl::AppendColumn() and then add the items. While only the text of the first column can be specified when adding them, you can use wxTreeListCtrl::SetItemText() to set the text of the other columns. Unlike wxTreeCtrl or wxListCtrl this control can sort its items on its own. To allow user to sort the control contents by clicking on some column you should use wxCOL_SORTABLE flag when adding that column to the control. When a column with this flag is clicked, the control resorts itself using the values in this column. By default the sort is done using alphabetical order comparison of the items text, which is not always correct (e.g. this doesn't work for the numeric columns). To change this you may use SetItemComparator() method to provide a custom comparator, i.e. simply an object that implements comparison between the two items. The treelist sample shows an example of doing this. And if you need to sort the control programmatically, you can call SetSortColumn() method. Here are the styles supported by this control. Notice that using wxTL_USER_3STATE implies wxTL_3STATE and wxTL_3STATE in turn implies wxTL_CHECKBOX. @beginStyleTable @style{wxTL_SINGLE} Single selection, this is the default. @style{wxTL_MULTIPLE} Allow multiple selection, see GetSelections(). @style{wxTL_CHECKBOX} Show the usual, 2 state, checkboxes for the items in the first column. @style{wxTL_3STATE} Show the checkboxes that can possibly be set by the program, but not the user, to a third, undetermined, state, for the items in the first column. Implies wxTL_CHECKBOX. @style{wxTL_USER_3STATE} Same as wxTL_3STATE but the user can also set the checkboxes to the undetermined state. Implies wxTL_3STATE. @style{wxTL_DEFAULT_STYLE} Style used by the control by default, just wxTL_SINGLE currently. @endStyleTable @beginEventTable{wxTreeListEvent} @event{EVT_TREELIST_SELECTION_CHANGED(id, func)} Process @c wxEVT_COMMAND_TREELIST_SELECTION_CHANGED event and notifies about the selection change in the control. In the single selection case the item indicated by the event has been selected and previously selected item, if any, was deselected. In multiple selection case, the selection of this item has just changed (it may have been either selected or deselected) but notice that the selection of other items could have changed as well, use wxTreeListCtrl::GetSelections() to retrieve the new selection if necessary. @event{EVT_TREELIST_ITEM_EXPANDING(id, func)} Process @c wxEVT_COMMAND_TREELIST_ITEM_EXPANDING event notifying about the given branch being expanded. This event is sent before the expansion occurs and can be vetoed to prevent it from happening. @event{EVT_TREELIST_ITEM_EXPANDED(id, func)} Process @c wxEVT_COMMAND_TREELIST_ITEM_EXPANDED event notifying about the expansion of the given branch. This event is sent after the expansion occurs and can't be vetoed. @event{EVT_TREELIST_ITEM_CHECKED(id, func)} Process @c wxEVT_COMMAND_TREELIST_ITEM_CHECKED event notifying about the user checking or unchecking the item. You can use wxTreeListCtrl::GetCheckedState() to retrieve the new item state and wxTreeListEvent::GetOldCheckedState() to get the previous one. @event{EVT_TREELIST_ITEM_ACTIVATED(id, func)} Process @c wxEVT_COMMAND_TREELIST_ITEM_ACTIVATED event notifying about the user double clicking the item or activating it from keyboard. @event{EVT_TREELIST_ITEM_CONTEXT_MENU(id, func)} Process @c wxEVT_COMMAND_TREELIST_ITEM_CONTEXT_MENU event indicating that the popup menu for the given item should be displayed. @event{EVT_TREELIST_COLUMN_SORTED(id, func)} Process @c wxEVT_COMMAND_TREELIST_COLUMN_SORTED event indicating that the control contents has just been resorted using the specified column. The event doesn't carry the sort direction, use GetSortColumn() method if you need to know it. @endEventTable @library{wxadv} @category{ctrl} @since 2.9.3 @see wxTreeCtrl, wxDataViewCtrl */ class wxTreeListCtrl : public wxWindow { public: /** Default constructor, call Create() later. This constructor is used during two-part construction process when it is impossible or undesirable to create the window when constructing the object. */ wxTreeListCtrl(); /** Full constructing, creating the object and its window. See Create() for the parameters description. */ wxTreeListCtrl(wxWindow* parent, wxWindowID id, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = wxTL_DEFAULT_STYLE, const wxString& name = wxTreeListCtrlNameStr); /** Create the control window. Can be only called for the objects created using the default constructor and exactly once. @param parent The parent window, must be non-NULL. @param id The window identifier, may be ::wxID_ANY. @param pos The initial window position, usually unused. @param size The initial window size, usually unused. @param style The window style, see their description in the class documentation. @param name The name of the window. */ bool Create(wxWindow* parent, wxWindowID id, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = wxTL_DEFAULT_STYLE, const wxString& name = wxTreeListCtrlNameStr); /** Image list methods. Like wxTreeCtrl and wxListCtrl this class uses wxImageList so if you intend to use item icons with it, you must construct wxImageList containing them first and then specify the indices of the icons in this image list when adding the items later. */ //@{ /// A constant indicating that no image should be used for an item. static const int NO_IMAGE = -1; /** Sets the image list and gives its ownership to the control. The image list assigned with this method will be automatically deleted by wxTreeCtrl as appropriate (i.e. it takes ownership of the list). @see SetImageList(). */ void AssignImageList(wxImageList* imageList); /** Sets the image list. The image list assigned with this method will @b not be deleted by the control itself and you will need to delete it yourself, use AssignImageList() to give the image list ownership to the control. @param imageList Image list to use, may be @NULL to not show any images any more. */ void SetImageList(wxImageList* imageList); //@} /** Column methods. */ //@{ /** Add a column with the given title and attributes. @param title The column label. @param width The width of the column in pixels or the special wxCOL_WIDTH_AUTOSIZE value indicating that the column should adjust to its contents. Notice that the first column is special and will be always resized to fill all the space not taken by the other columns, i.e. the width specified here is ignored for it. @param align Alignment of both the column header and its items. @param flags Column flags, currently can include wxCOL_RESIZABLE to allow the user to resize the column and wxCOL_SORTABLE to allow the user to resort the control contents by clicking on this column. @return Index of the new column or -1 on failure. */ int AppendColumn(const wxString& title, int width = wxCOL_WIDTH_AUTOSIZE, wxAlignment align = wxALIGN_LEFT, int flags = wxCOL_RESIZABLE); /// Return the total number of columns. unsigned GetColumnCount() const; /** Delete the column with the given index. @param col Column index in 0 to GetColumnCount() (exclusive) range. @return True if the column was deleted, false if index is invalid or deleting the column failed for some other reason. */ bool DeleteColumn(unsigned col); /** Delete all columns. @see DeleteAllItems() */ void ClearColumns(); /** Change the width of the given column. Set column width to either the given value in pixels or to the value large enough to fit all of the items if width is wxCOL_WIDTH_AUTOSIZE. Notice that setting the width of the first column is ignored as this column is always resized to fill the space left by the other columns. */ void SetColumnWidth(unsigned col, int width); /// Get the current width of the given column in pixels. int GetColumnWidth(unsigned col) const; /** Get the width appropriate for showing the given text. This is typically used as second argument for AppendColumn() or with SetColumnWidth(). */ int WidthFor(const wxString& text) const; //@} /** Adding and removing items. When adding items, the parent and text of the first column of the new item must always be specified, the rest is optional. Each item can have two images: one used for closed state and another for opened one. Only the first one is ever used for the items that don't have children. And both are not set by default. It is also possible to associate arbitrary client data pointer with the new item. It will be deleted by the control when the item is deleted (either by an explicit DeleteItem() call or because the entire control is destroyed). */ //@{ /// Same as InsertItem() with wxTLI_LAST. wxTreeListItem AppendItem(wxTreeListItem parent, const wxString& text, int imageClosed = NO_IMAGE, int imageOpened = NO_IMAGE, wxClientData* data = NULL); /** Insert a new item into the tree. @param parent The item parent. Must be valid, may be GetRootItem(). @param previous The previous item that this one should be inserted immediately after. It must be valid but may be one of the special values wxTLI_FIRST or wxTLI_LAST indicating that the item should be either inserted before the first child of its parent (if any) or after the last one. @param imageClosed The normal item image, may be NO_IMAGE to not show any image. @param imageOpened The item image shown when it's in the expanded state. @param data Optional client data pointer that can be later retrieved using GetItemData() and will be deleted by the tree when the item itself is deleted. */ wxTreeListItem InsertItem(wxTreeListItem parent, wxTreeListItem previous, const wxString& text, int imageClosed = NO_IMAGE, int imageOpened = NO_IMAGE, wxClientData* data = NULL); /// Same as InsertItem() with wxTLI_FIRST. wxTreeListItem PrependItem(wxTreeListItem parent, const wxString& text, int imageClosed = NO_IMAGE, int imageOpened = NO_IMAGE, wxClientData* data = NULL); /// Delete the specified item. void DeleteItem(wxTreeListItem item); /// Delete all tree items. void DeleteAllItems(); //@} /** Methods for the tree navigation. The tree has an invisible root item which is the hidden parent of all top-level items in the tree. Starting from it it is possible to iterate over all tree items using GetNextItem(). It is also possible to iterate over just the children of the given item by using GetFirstChild() to get the first of them and then calling GetNextSibling() to retrieve all the others. */ //@{ /// Return the (never shown) root item. wxTreeListItem GetRootItem() const; /** Return the parent of the given item. All the tree items visible in the tree have valid parent items, only the never shown root item has no parent. */ wxTreeListItem GetItemParent(wxTreeListItem item) const; /** Return the first child of the given item. Item may be the root item. Return value may be invalid if the item doesn't have any children. */ wxTreeListItem GetFirstChild(wxTreeListItem item) const; /** Return the next sibling of the given item. Return value may be invalid if there are no more siblings. */ wxTreeListItem GetNextSibling(wxTreeListItem item) const; /** Return the first item in the tree. This is the first child of the root item. @see GetNextItem() */ wxTreeListItem GetFirstItem() const; /** Get item after the given one in the depth-first tree-traversal order. Calling this function starting with the result of GetFirstItem() allows iterating over all items in the tree. The iteration stops when this function returns an invalid item, i.e. @code for ( wxTreeListItem item = tree->GetFirstItem(); item.IsOk(); item = tree->GetNextItem(item) ) { ... Do something with every tree item ... } @endcode */ wxTreeListItem GetNextItem(wxTreeListItem item) const; //@} /** Items attributes */ //@{ /** Return the text of the given item. By default, returns the text of the first column but any other one can be specified using @a col argument. */ const wxString& GetItemText(wxTreeListItem item, unsigned col = 0) const; /** Set the text of the specified column of the given item. */ void SetItemText(wxTreeListItem item, unsigned col, const wxString& text); /** Set the text of the first column of the given item. */ void SetItemText(wxTreeListItem item, const wxString& text); /** Set the images for the given item. See InsertItem() for the images parameters descriptions. */ void SetItemImage(wxTreeListItem item, int closed, int opened = NO_IMAGE); /** Get the data associated with the given item. The returned pointer may be @NULL. It must not be deleted by the caller as this will be done by the control itself. */ wxClientData* GetItemData(wxTreeListItem item) const; /** Set the data associated with the given item. Previous client data, if any, is deleted when this function is called so it may be used to delete the current item data object and reset it by passing @NULL as @a data argument. */ void SetItemData(wxTreeListItem item, wxClientData* data); //@} /** Expanding and collapsing tree branches. Notice that calling neither Expand() nor Collapse() method generates any events. */ //@{ /** Expand the given tree branch. */ void Expand(wxTreeListItem item); /** Collapse the given tree branch. */ void Collapse(wxTreeListItem item); /** Return whether the given item is expanded. */ bool IsExpanded(wxTreeListItem item) const; //@} /** Selection methods. The behaviour of the control is different in single selection mode (the default) and multi-selection mode (if @c wxTL_MULTIPLE was specified when creating it). Not all methods can be used in both modes and some of those that can don't behave in the same way in two cases. */ //@{ /** Return the currently selected item. This method can't be used with multi-selection controls, use GetSelections() instead. The return value may be invalid if no item has been selected yet. Once an item in a single selection control was selected, it will keep a valid selection. */ wxTreeListItem GetSelection() const; /** Fill in the provided array with all the selected items. This method can be used in both single and multi-selection case. The previous array contents is destroyed. Returns the number of selected items. */ unsigned GetSelections(wxTreeListItems& selections) const; /** Select the given item. In single selection mode, deselects any other selected items, in multi-selection case it adds to the selection. */ void Select(wxTreeListItem item); /** Deselect the given item. This method can be used in multiple selection mode only. */ void Unselect(wxTreeListItem item); /** Return true if the item is selected. This method can be used in both single and multiple selection modes. */ bool IsSelected(wxTreeListItem item) const; /** Select all the control items. Can be only used in multi-selection mode. */ void SelectAll(); /** Deselect all the control items. Can be only used in multi-selection mode. */ void UnselectAll(); //@} /** Checkbox handling Methods in this section can only be used with the controls created with wxTL_CHECKBOX style. */ //@{ /** Change the item checked state. @param item Valid non-root tree item. @param state One of wxCHK_CHECKED, wxCHK_UNCHECKED or, for the controls with wxTL_3STATE or wxTL_USER_3STATE styles, wxCHK_UNDETERMINED. */ void CheckItem(wxTreeListItem item, wxCheckBoxState state = wxCHK_CHECKED); /** Change the checked state of the given item and all its children. This is the same as CheckItem() but checks or unchecks not only this item itself but all its children recursively as well. */ void CheckItemRecursively(wxTreeListItem item, wxCheckBoxState state = wxCHK_CHECKED); /** Uncheck the given item. This is synonymous with CheckItem(wxCHK_UNCHECKED). */ void UncheckItem(wxTreeListItem item); /** Update the state of the parent item to reflect the checked state of its children. This method updates the parent of this item recursively: if this item and all its siblings are checked, the parent will become checked as well. If this item and all its siblings are unchecked, the parent will be unchecked. And if the siblings of this item are not all in the same state, the parent will be switched to indeterminate state. And then the same logic will be applied to the parents parent and so on recursively. This is typically called when the state of the given item has changed from EVT_TREELIST_ITEM_CHECKED() handler in the controls which have wxTL_3STATE flag. Notice that without this flag this function can't work as it would be unable to set the state of a parent with both checked and unchecked items so it's only allowed to call it when this flag is set. */ void UpdateItemParentStateRecursively(wxTreeListItem item); /** Return the checked state of the item. The return value can be wxCHK_CHECKED, wxCHK_UNCHECKED or wxCHK_UNDETERMINED. */ wxCheckBoxState GetCheckedState(wxTreeListItem item) const; /** Return true if all children of the given item are in the specified state. This is especially useful for the controls with @c wxTL_3STATE style to allow to decide whether the parent effective state should be the same @a state, if all its children are in it, or ::wxCHK_UNDETERMINED. @see UpdateItemParentStateRecursively() */ bool AreAllChildrenInState(wxTreeListItem item, wxCheckBoxState state) const; //@} /** Sorting. If some control columns were added with wxCOL_SORTABLE flag, clicking on them will automatically resort the control using the custom comparator set by SetItemComparator() or by doing alphabetical comparison by default. In any case, i.e. even if the user can't sort the control by clicking on its header, you may call SetSortColumn() to sort it programmatically and call GetSortColumn() to determine whether it's sorted now and, if so, by which column and in which order. */ //@{ /** Set the column to use for sorting and the order in which to sort. Calling this method resorts the control contents using the values of the items in the specified column. Sorting uses custom comparator set with SetItemComparator() or alphabetical comparison of items texts if none was specified. Notice that currently there is no way to reset sort order. @param col A valid column index. @param ascendingOrder Indicates whether the items should be sorted in ascending (A to Z) or descending (Z to A) order. */ void SetSortColumn(unsigned col, bool ascendingOrder = true); /** Return the column currently used for sorting, if any. If the control is currently unsorted, the function simply returns @false and doesn't modify any of its output parameters. @param col Receives the index of the column used for sorting if non-@NULL. @param ascendingOrder Receives @true or @false depending on whether the items are sorted in ascending or descending order. @return @true if the control is sorted or @false if it isn't sorted at all. */ bool GetSortColumn(unsigned* col, bool* ascendingOrder = NULL); /** Set the object to use for comparing the items. This object will be used when the control is being sorted because the user clicked on a sortable column or SetSortColumn() was called. The provided pointer is stored by the control so the object it points to must have a life-time equal or greater to that of the control itself. In addition, the pointer can be @NULL to stop using custom comparator and revert to the default alphabetical comparison. */ void SetItemComparator(wxTreeListItemComparator* comparator); //@} /** View window. This control itself is entirely covered by the "view window" which is currently a wxDataViewCtrl but if you want to avoid relying on this to allow your code to work with later versions which might not be wxDataViewCtrl-based, use GetView() function only and only use GetDataView() if you really need to call wxDataViewCtrl methods on it. */ //@{ /** Return the view part of this control as a wxWindow. This method always returns non-@NULL pointer once the window was created. */ wxWindow* GetView() const; /** Return the view part of this control as wxDataViewCtrl. This method may return @NULL in the future, non wxDataViewCtrl-based, versions of this class, use GetView() unless you really need to use wxDataViewCtrl methods on the returned object. */ wxDataViewCtrl* GetDataView() const; //@} }; /** Event generated by wxTreeListCtrl. @since 2.9.3 */ class wxTreeListEvent : public wxNotifyEvent { public: /** Return the item affected by the event. This is the item being selected, expanded, checked or activated (depending on the event type). */ wxTreeListItem GetItem() const; /** Return the previous state of the item checkbox. This method can be used with @c wxEVT_COMMAND_TREELIST_ITEM_CHECKED events only. Notice that the new state of the item can be retrieved using wxTreeListCtrl::GetCheckedState(). */ wxCheckBoxState GetOldCheckedState() const; /** Return the column affected by the event. This is currently only used with @c wxEVT_COMMAND_TREELIST_COLUMN_SORTED event. */ unsigned GetColumn() const; }; /** Type of wxTreeListEvent event handlers. This macro should be used with wxEvtHandler::Connect() when connecting to wxTreeListCtrl events. */ #define wxTreeListEventHandler(func) \ wxEVENT_HANDLER_CAST(wxTreeListEventFunction, func)