/usr/include/Wt/WTreeNode is in libwt-dev 3.3.6+dfsg-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 | // This may look like C code, but it's really -*- C++ -*-
/*
* Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/
#ifndef WTREENODE_H_
#define WTREENODE_H_
#include <Wt/WCompositeWidget>
namespace Wt {
/*! \class WTreeNode Wt/WTreeNode Wt/WTreeNode
* \brief A single node in a tree.
*
* A tree list is constructed by combining several tree node objects
* in a tree hierarchy, by passing the parent tree node as the last
* argument in the child node constructor, or by using addChildNode(),
* to add a child to its parent.
*
* Each tree node has a label, and optionally a label icon pair. The
* icon pair offers the capability to show a different icon depending
* on the state of the node (expanded or collapsed). When the node has
* any children, a child count may be displayed next to the label
* using setChildCountPolicy().
*
* Expanding a tree node it will collapse all its children, so that a user
* may collapse/expand a node as a short-cut to collapsing all children.
*
* The treenode provides several policies to communicate the current
* contents of the tree to the client (if possible):
* <ul>
* <li>WTreeNode::PreLoading: the entire tree is transmitted to the client,
* and all tree navigation requires no further communication.</li>
* <li>WTreeNode::LazyLoading: only the minimum is transmitted to the
* client. When expanding a node for the first time, only then it is
* transmitted to the client, and this may thus have some latency.</li>
* <li>WTreeNode::NextLevelLoading: all leafs of visible children are
* transmitted, but not their children. This provides a good trade-off
* between bandwith use and interactivity, since expanding any
* tree node will happen instantly, and at the same time trigger some
* communication in the back-ground to load the next level of
* invisible nodes.</li>
* </ul>
*
* The default policy is WTreeNode::LazyLoading. Another load policy
* may be specified using setLoadPolicy() on the root node and before
* adding any children. The load policy is inherited by all children
* in the tree.
*
* There are a few scenarios where it makes sense to specialize the
* %WTreeNode class. One scenario is create a tree that is populated
* dynamically while browsing. For this purpose you should reimplement the
* populate() method, whose default implementation does nothing. This
* method is called when 'loading' the node. The exact moment for loading
* a treenode depends on the LoadPolicy.
*
* A second scenario that is if you want to customize the look of the
* tree label (see labelArea()) or if you want to modify or augment
* the event collapse/expand event handling (see doExpand() and
* doCollapse()).
*
* See WTree for a usage example.
*
* \sa WTree, WTreeTableNode
*/
class WT_API WTreeNode : public WCompositeWidget
{
public:
/*! \brief An enumeration for the policy to load children.
*/
enum LoadPolicy { LazyLoading, //!< Load-on-demand of child nodes
PreLoading, //!< Pre-load all child nodes
NextLevelLoading //!< Pre-load one level of child nodes
};
/*! \brief An enumeration for the policy to display the child count
*/
enum ChildCountPolicy {
Disabled, //!< Do not display a child count
Enabled, //!< Always display a child count
Lazy //!< Only display a child count when the node is populated
};
/*! \brief Creates a tree node with the given label.
*
* The labelIcon, if specified, will appear just before the label and
* its state reflect the expand/collapse state of the node.
*
* The node is initialized to be collapsed.
*/
WTreeNode(const WString& labelText,
WIconPair *labelIcon = 0,
WTreeNode *parentNode = 0);
/*! \brief Destructor.
*/
~WTreeNode();
/*! \brief Returns the tree.
*
* By default if this node has no parent the result will be 0.
*/
virtual WTree *tree() const;
/*! \brief Returns the label.
*/
WText *label() const { return labelText_; }
/*! \brief Returns the label icon.
*/
WIconPair *labelIcon() const { return labelIcon_; }
/*! \brief Sets the label icon.
*/
void setLabelIcon(WIconPair *labelIcon);
/*! \brief Inserts a child node.
*
* Inserts the node \p node at index \p index.
*/
virtual void insertChildNode(int index, WTreeNode *node);
/*! \brief Adds a child node.
*
* Equivalent to:
* \code
* insertChildNode(childNodes().size(), node);
* \endcode
*
* \sa insertChildNode()
*/
void addChildNode(WTreeNode *node);
/*! \brief Removes a child node.
*
* \if cpp
* The child node itself is not deleted
* \endif
*/
void removeChildNode(WTreeNode *node);
/*! \brief Returns the list of children.
*/
const std::vector<WTreeNode *>& childNodes() const { return childNodes_; }
/*! \brief Returns the number of children that should be displayed.
*
* This is used to display the count in the count label. The default
* implementation simply returns childNodes().size().
*/
virtual int displayedChildCount() const;
/*! \brief Configures how and when the child count should be displayed
*
* By default, no child count indication is disabled (this is the behaviour
* since 2.1.1). Use this method to enable child count indications.
*
* The child count policy is inherited by all children in the tree.
*/
void setChildCountPolicy(ChildCountPolicy policy);
/*! \brief Returns the child count policy
*
* \sa setChildCountPolicy(ChildCountPolicy policy)
*/
ChildCountPolicy childCountPolicy() const { return childCountPolicy_; }
/*! \brief Sets the image pack for this (sub)tree (<b>deprecated</b>).
*
* \deprecated This method does not do anything since %Wt 3.1.1, as the
* tree is now styled based on the current CSS theme.
*/
void setImagePack(const std::string& url);
/*! \brief Sets the load policy for this tree.
*
* This may only be set on the root of a tree, and before adding
* any children.
*/
void setLoadPolicy(LoadPolicy loadPolicy);
/*! \brief Returns whether this node is expanded.
*/
bool isExpanded() const;
/*! \brief Allows this node to be selected.
*
* By default, all nodes may be selected.
*
* \sa isSelectable(), WTree::select(WTreeNode *, bool)
*/
void setSelectable(bool selectable);
/*! \brief Returns if this node may be selected.
*
* \sa setSelectable(bool)
*/
virtual bool isSelectable() const { return selectable_; }
/*! \brief Returns the parent node
*
* \sa childNodes()
*/
WTreeNode *parentNode() const { return parentNode_; }
/*! \brief Sets the visibility of the node itself
*
* If \c false, then the node itself is not displayed, but only its children.
* This is typically used to hide the root node of a tree.
*/
void setNodeVisible(bool visible);
/*! \brief Sets whether this node's children are decorated.
*
* By default, node's children have expand/collapse and other lines
* to display their linkage and offspring.
*
* By setting \p decorated to \c false, you can hide the decorations for the
* node's children.
*/
void setChildrenDecorated(bool decorated);
/*! \brief Sets whether this node is interactive.
*
* Interactive nodes can be clicked upon and will populate a list of children
* when clicked. By disabling the interactivity, a node will not react to a
* click event.
*/
void setInteractive(bool interactive);
/*! \brief Expands this node.
*
* Besides the actual expansion of the node, this may also trigger
* the loading and population of the node children, or of the children's
* children.
*
* \sa collapse()
* \sa doExpand()
*/
void expand();
/*! \brief Collapses this node.
*
* \sa expand()
* \sa doCollapse()
*/
void collapse();
/*! \brief %Signal emitted when the node is expanded by the user.
*
* \sa collapsed()
*/
EventSignal<WMouseEvent>& expanded();
/*! \brief %Signal emitted when the node is collapsed by the user.
*
* \sa expanded()
*/
EventSignal<WMouseEvent>& collapsed();
/*! \brief %Signal that is emitted when the node is added or removed from
* the selection
*
* \sa WTree::itemSelectionChanged
*/
Signal<bool>& selected() { return selected_; }
#ifndef WT_TARGET_JAVA
virtual bool hasParent() const;
#endif //WT_TARGET_JAVA
protected:
/*! \brief Creates a tree node with empty labelArea().
*
* This tree node has no label or labelicon, and is therefore ideally
* suited to provide a custom look.
*/
WTreeNode(WTreeNode *parentNode = 0);
/*! \brief Accesses the container widget that holds the label area.
*
* Use this to customize how the label should look like.
*/
WContainerWidget *labelArea();
/*! \brief Populates the node dynamically on loading.
*
* Reimplement this method if you want to populate the widget dynamically,
* as the tree is being browsed and therefore loaded. This is only
* usefull with LazyLoading or NextLevelLoading strategies.
*/
virtual void populate();
/*! \brief Returns whether this node has already been populated.
*
* \sa populate()
*/
bool populated() const { return populated_; }
/*! \brief Returns whether this node can be expanded.
*
* The default implementation populates the node if necessary, and then
* checks if there are any child nodes.
*
* You may wish to reimplement this method if you reimplement populate(),
* and you have a quick default for determining whether a node may be
* expanded (which does not require populating the node).
*
* \sa populate()
*/
virtual bool expandable();
/*! \brief Renders the node to be selected.
*
* The default implementation changes the style class of the labelArea()
* to "selected".
*/
virtual void renderSelected(bool selected);
/*! \brief The image pack that is used for this tree node (<b>deprecated</b>).
*
* \deprecated This method returns "" since %Wt 3.1.1, as the image pack is
* no longer used in favour of the CSS themes.
*/
std::string imagePack() const;
/*! \brief Reacts to the removal of a descendant node.
*
* Reimplement this method if you wish to react on the removal of a
* descendant node. The default implementation simply propagates the
* event to the parent.
*/
virtual void descendantRemoved(WTreeNode *node);
/*! \brief Reacts to the addition of a descendant node.
*
* Reimplement this method if you wish to react on the addition of a
* descendant node. The default implementation simply propagates the
* event to the parent.
*/
virtual void descendantAdded(WTreeNode *node);
/*! \brief The actual expand.
*
* This method, which is implemented as a stateless slot, performs the
* actual expansion of the node.
*
* You may want to reimplement this function (and undoDoExpand()) if you
* wish to do additional things on node expansion.
*
* \sa doCollapse()
* \sa expand()
*/
virtual void doExpand();
/*! \brief The actual collapse.
*
* This method, which is implemented as a stateless slot, performs the
* actual collapse of the node.
*
* You may want to reimplement this function (and undoDoCollapse()) if you
* wish to do additional things on node expansion.
*
* \sa doExpand()
* \sa collapse()
*/
virtual void doCollapse();
/*! \brief Undo method for doCollapse() stateless implementation.
*
* \sa doCollapse()
*/
virtual void undoDoExpand();
/*! \brief Undo method for doCollapse() stateless implementation.
*
* \sa doExpand()
*/
virtual void undoDoCollapse();
/*! \brief Accesses the icon pair that allows expansion of the tree node.
*/
WIconPair *expandIcon() const { return expandIcon_; }
WTemplate *impl() const { return layout_; }
private:
std::vector<WTreeNode *> childNodes_;
bool collapsed_, selectable_, visible_, childrenDecorated_;
WTreeNode *parentNode_;
LoadPolicy loadPolicy_;
ChildCountPolicy childCountPolicy_;
WTemplate *layout_;
WIconPair *expandIcon_;
WText *noExpandIcon_;
WIconPair *labelIcon_;
WText *labelText_;
WText *childCountLabel_;
bool childrenLoaded_;
bool populated_;
bool interactive_;
Signal<bool> selected_;
WContainerWidget *childContainer();
void loadChildren();
void loadGrandChildren();
void create();
void update();
bool isLastChildNode() const;
void updateChildren(bool recursive = false);
bool wasCollapsed_;
bool doPopulate();
static const char* imagePlus_;
static const char* imageMin_;
static const char* imagePlusRtl_;
static const char* imageMinRtl_;
Wt::Signals::connection clickedConnection_;
friend class WTree;
};
}
#endif // WTREENODE_H_
|