{"id":4636,"date":"2025-01-27T10:58:54","date_gmt":"2025-01-27T10:58:54","guid":{"rendered":"https:\/\/truelogic.org\/wordpress\/?p=4636"},"modified":"2025-01-27T10:58:54","modified_gmt":"2025-01-27T10:58:54","slug":"18-wxwidgets-wxtreectrl","status":"publish","type":"post","link":"https:\/\/truelogic.org\/wordpress\/2025\/01\/27\/18-wxwidgets-wxtreectrl\/","title":{"rendered":"18.wxWidgets – wxTreeCtrl"},"content":{"rendered":"\n

OVERVIEW<\/strong><\/p>\n\n\n\n

The wxTreeCtrl lets you display data in a hierarchical tree format. It supports different styles and has comprehensive events which can be processed. Given below is a sample tree which shows cities in countries. <\/p>\n\n\n\n

SAMPLE CODE<\/strong><\/p>\n\n\n\n

tree.h<\/p>\n\n\n

\n#include <wx\/wxprec.h>\n#ifndef WX_PRECOMP\n#include <wx\/wx.h>\n#endif \/\/ WX_PRECOMP\n\n#include <wx\/treectrl.h>\n\nclass Tree: public wxFrame {\npublic:\n    Tree(const wxString &title);\nprivate:\n    wxTreeCtrl *m_tree;\n    wxStaticText *m_title;\n    void treeSelChanged(wxTreeEvent &evt);\n};\n\n<\/pre><\/div>\n\n\n
tree.cpp<\/p>\n\n\n
\n#include "tree.h"\n\nTree::Tree(const wxString &title):\n    wxFrame(NULL, -1, title, wxDefaultPosition, wxSize(800,400)) {\n\n    wxPanel *panHome = new wxPanel(this, -1);\n    wxBoxSizer *vbox = new wxBoxSizer(wxVERTICAL);\n    panHome->SetSizer(vbox);\n\n    m_title = new wxStaticText(panHome, -1, wxT("Tree Demo"));\n    vbox->Add(m_title, 0, wxEXPAND | wxALL,2);\n    m_tree = new wxTreeCtrl(panHome, -1, wxDefaultPosition, wxDefaultSize, wxTR_HAS_BUTTONS | wxTR_SINGLE,\n                            wxDefaultValidator, wxT("Tree Control"));\n    vbox->Add(m_tree, 4, wxEXPAND | wxALL, 2);\n\n    \/\/populate tree\n    wxTreeItemId root = m_tree->AddRoot(wxT("Countries"), -1, -1, NULL);\n    wxTreeItemId uk = m_tree->AppendItem(root, wxT("United Kingdom"), -1, -1, NULL);\n    wxTreeItemId uk_london = m_tree->AppendItem(uk, wxT("London"), -1, -1, NULL);\n    wxTreeItemId uk_manchester = m_tree->AppendItem(uk, wxT("Manchester"), -1, -1, NULL);\n    wxTreeItemId uk_birmingham= m_tree->AppendItem(uk, wxT("Birmingham"), -1, -1, NULL);\n\n    wxTreeItemId usa = m_tree->AppendItem(root, wxT("United States"), -1, -1, NULL);\n    wxTreeItemId usa_ny = m_tree->AppendItem(usa, wxT("New York"), -1, -1, NULL);\n    wxTreeItemId usa_chi = m_tree->AppendItem(usa, wxT("Chicago"), -1, -1, NULL);\n    wxTreeItemId usa_det = m_tree->AppendItem(usa, wxT("Detroit"), -1, -1, NULL);\n    wxTreeItemId usa_wash = m_tree->AppendItem(usa, wxT("Washington"), -1, -1, NULL);\n\n    wxTreeItemId russia = m_tree->AppendItem(root, wxT("Russia"), -1, -1, NULL);\n    wxTreeItemId russia_moscow = m_tree->AppendItem(russia, wxT("Moscow"), -1, -1, NULL);\n    wxTreeItemId russia_lenin = m_tree->AppendItem(russia, wxT("Leningrad"), -1, -1, NULL);\n\n    wxTreeItemId italy = m_tree->AppendItem(root, wxT("Italy"), -1, -1, NULL);\n    wxTreeItemId italy_milan = m_tree->AppendItem(italy, wxT("Milan"), -1, -1, NULL);\n    wxTreeItemId italy_rome = m_tree->AppendItem(italy, wxT("Rome"), -1, -1, NULL);\n    wxTreeItemId italy_pisa = m_tree->AppendItem(italy, wxT("Pisa"), -1, -1, NULL);\n\n    m_tree->Bind(wxEVT_TREE_SEL_CHANGED, &Tree::treeSelChanged, this);\n}\n\nvoid Tree::treeSelChanged(wxTreeEvent &evt) {\n    wxTreeItemId item = evt.GetItem();\n    wxString lbl = m_tree->GetItemText(item);\n    wxMessageBox(lbl);\n}\n\n\n<\/pre><\/div>\n\n\n
main.h<\/p>\n\n\n
\n#include <wx\/wxprec.h>\n#ifndef WX_PRECOMP\n#include <wx\/wx.h>\n#endif \/\/ WX_PRECOMP\n\n#include "tree.h"\n\nclass MainApp: public wxApp {\npublic:\n    virtual bool OnInit();\n\n};\n\n\n\n\n<\/pre><\/div>\n\n\n
main.cpp<\/p>\n\n\n
\n#include "main.h"\n\nbool MainApp::OnInit() {\n    Tree *tree = new Tree(wxT("Tree Demo App"));\n    tree->Show(true);\n    return TRUE;\n}\n\nwxIMPLEMENT_APP(MainApp);\n\n<\/pre><\/div>\n\n\n
The sample output is shown below:<\/p>\n\n\n\n
\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
OVERVIEW The wxTreeCtrl lets you display data in a hierarchical tree format. It supports different styles and has comprehensive events which can be processed. Given […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":4405,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[302,365],"tags":[],"class_list":["post-4636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cc","category-wxwidgets"],"_links":{"self":[{"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/posts\/4636","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/comments?post=4636"}],"version-history":[{"count":6,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/posts\/4636\/revisions"}],"predecessor-version":[{"id":4643,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/posts\/4636\/revisions\/4643"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/media\/4405"}],"wp:attachment":[{"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/media?parent=4636"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/categories?post=4636"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/tags?post=4636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}