Wt examples
3.2.1
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A demonstration of the treelist. More...
#include <DemoTreeList.h>
Public Member Functions | |
DemoTreeList (Wt::WContainerWidget *parent) | |
Create a DemoTreeList. | |
Private Member Functions | |
void | addMap () |
Add a map. | |
void | removeMap () |
Remove a map. | |
TreeNode * | makeTreeMap (const std::string name, TreeNode *parent) |
Create a "map" node, and insert in the given parent. | |
TreeNode * | makeTreeFile (const std::string name, TreeNode *parent) |
Create a "file" node, and insert in the given parent. | |
Private Attributes | |
TreeNode * | tree_ |
TreeNode * | testMap_ |
int | testCount_ |
Wt::WPushButton * | addMapButton_ |
Wt::WPushButton * | removeMapButton_ |
A demonstration of the treelist.
This is the main class for the treelist example.
Definition at line 27 of file DemoTreeList.h.
DemoTreeList::DemoTreeList | ( | Wt::WContainerWidget * | parent | ) |
Create a DemoTreeList.
Definition at line 20 of file DemoTreeList.C.
: WContainerWidget(parent), testCount_(0) { addWidget (new WText("<h2>Wt Tree List example</h2>" "<p>This is a simple demo of a treelist, implemented using" " <a href='http://witty.sourceforge.net/'>Wt</a>.</p>" "<p>The leafs of the tree contain the source code of the " "tree-list in the classes <b>TreeNode</b> and " "<b>IconPair</b>, as well as the implementation of this " "demo itself in the class <b>DemoTreeList</b>.</p>")); tree_ = makeTreeMap("Examples", 0); addWidget(tree_); TreeNode *treelist = makeTreeMap("Tree List", tree_); TreeNode *wstateicon = makeTreeMap("class IconPair", treelist); makeTreeFile("<a href=\"IconPair.h\">IconPair.h</a>", wstateicon); makeTreeFile("<a href=\"IconPair.C\">IconPair.C</a>", wstateicon); TreeNode *wtreenode = makeTreeMap("class TreeNode", treelist); makeTreeFile("<a href=\"TreeNode.h\">TreeNode.h</a>", wtreenode); makeTreeFile("<a href=\"TreeNode.C\">TreeNode.C</a>", wtreenode); TreeNode *demotreelist = makeTreeMap("class DemoTreeList", treelist); makeTreeFile("<a href=\"DemoTreeList.h\">DemoTreeList.h</a>", demotreelist); makeTreeFile("<a href=\"DemoTreeList.C\">DemoTreeList.C</a>", demotreelist); testMap_ = makeTreeMap("Test map", tree_); /* * Buttons to dynamically demonstrate changing the tree contents. */ addWidget (new WText("<p>Use the following buttons to change the tree " "contents:</p>")); addMapButton_ = new WPushButton("Add map", this); addMapButton_->clicked().connect(this, &DemoTreeList::addMap); removeMapButton_ = new WPushButton("Remove map", this); removeMapButton_->clicked().connect(this, &DemoTreeList::removeMap); removeMapButton_->disable(); addWidget (new WText("<p>Remarks:" "<ul>" "<li><p>This is not the instantiation of a pre-defined " "tree list component, but the full implementation of such " "a component, in about 350 lines of C++ code !</p> " "<p>In comparison, the <a href='http://myfaces.apache.org'> " "Apache MyFaces</a> JSF implementation of tree2, with similar " "functionality, uses about 2400 lines of Java, and 140 lines " "of JavaScript code.</p></li>" "<li><p>Once loaded, the tree list does not require any " "interaction with the server for handling the click events on " "the <img src='icons/nav-plus-line-middle.gif' /> and " "<img src='icons/nav-minus-line-middle.gif' /> icons, " "because these events have been connected to slots using " "STATIC connections. Such connections are converted to the " "appropriate JavaScript code that is inserted into the page. " "Still, the events are signaled to the server to update the " "application state.</p></li>" "<li><p>In contrast, the buttons for manipulating the tree " "contents use DYNAMIC connections, and thus the update " "is computed at server-side, and communicated back to the " "browser (by default using AJAX).</p></li>" "<li><p>When loading a page, only visible widgets (that are not " "<b>setHidden(true)</b>) are transmitted. " "The remaining widgets are loaded in the background after " "rendering the page. " "As a result the application is loaded as fast as possible.</p>" "</li>" "<li><p>The browser reload button is supported and behaves as " "expected: the page is reloaded from the server. Again, " "only visible widgets are transmitted immediately.</p> " "<p>(For the curious, this is the way to see the actual " "HTML/JavaScript code !)</p></li>" "</ul></p>")); }
void DemoTreeList::addMap | ( | ) | [private] |
Add a map.
Definition at line 102 of file DemoTreeList.C.
{ TreeNode *node = makeTreeMap("Map " + boost::lexical_cast<std::string>(++testCount_), testMap_); makeTreeFile("File " + boost::lexical_cast<std::string>(testCount_), node); removeMapButton_->enable(); }
Create a "file" node, and insert in the given parent.
Definition at line 143 of file DemoTreeList.C.
{ IconPair *labelIcon = new IconPair("icons/document.png", "icons/yellow-folder-open.png", false); TreeNode *node = new TreeNode(name, XHTMLText, labelIcon, 0); if (parent) parent->addChildNode(node); return node; }
Create a "map" node, and insert in the given parent.
Definition at line 129 of file DemoTreeList.C.
{ IconPair *labelIcon = new IconPair("icons/yellow-folder-closed.png", "icons/yellow-folder-open.png", false); TreeNode *node = new TreeNode(name, PlainText, labelIcon, 0); if (parent) parent->addChildNode(node); return node; }
void DemoTreeList::removeMap | ( | ) | [private] |
Remove a map.
Definition at line 113 of file DemoTreeList.C.
{ int numMaps = testMap_->childNodes().size(); if (numMaps > 0) { int c = rand() % numMaps; TreeNode *child = testMap_->childNodes()[c]; testMap_->removeChildNode(child); delete child; if (numMaps == 1) removeMapButton_->disable(); } }
Wt::WPushButton* DemoTreeList::addMapButton_ [private] |
Definition at line 39 of file DemoTreeList.h.
Wt::WPushButton* DemoTreeList::removeMapButton_ [private] |
Definition at line 40 of file DemoTreeList.h.
int DemoTreeList::testCount_ [private] |
Definition at line 37 of file DemoTreeList.h.
TreeNode* DemoTreeList::testMap_ [private] |
Definition at line 36 of file DemoTreeList.h.
TreeNode* DemoTreeList::tree_ [private] |
Definition at line 35 of file DemoTreeList.h.