{"id":4098,"date":"2022-01-12T17:23:09","date_gmt":"2022-01-12T17:23:09","guid":{"rendered":"http:\/\/truelogic.org\/wordpress\/?p=4098"},"modified":"2022-01-12T17:23:11","modified_gmt":"2022-01-12T17:23:11","slug":"9a-wxwidgets-wxlistbox","status":"publish","type":"post","link":"https:\/\/truelogic.org\/wordpress\/2022\/01\/12\/9a-wxwidgets-wxlistbox\/","title":{"rendered":"9a. wxWidgets – wxListBox"},"content":{"rendered":"\n

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

A wxListBox is a list which displays strings as items. It can select either a single item or multiple items. In the code below, we start with an empty wxListBox and then use buttons to add\/edit\/delete items .<\/p>\n\n\n\n

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

wxlistbox.h<\/pre>\n\n\n
\n#include <wx\/wxprec.h>\n#ifndef WX_PRECOMP\n\t#include <wx\/wx.h>\n#endif\n\nclass ListBox: public wxFrame {\n\tpublic:\n\t\tListBox(const wxString &title);\t\n\t\tvoid onAdd(wxCommandEvent &event);\n\t\tvoid onEdit(wxCommandEvent &event);\n\t\tvoid onDelete(wxCommandEvent &event);\n\t\tvoid onClear(wxCommandEvent &event);\n\n\tprivate:\n\t\twxListBox *mList;\t\n};\n<\/pre><\/div>\n\n\n
wxlistbox.cpp<\/pre>\n\n\n
\n#include "wxlistbox.h"\n\nListBox::ListBox(const wxString &title):\n\twxFrame(NULL, -1, title, wxDefaultPosition, wxSize(500,250)) {\n\n\twxPanel *basePanel = new wxPanel(this,-1);\n        wxBoxSizer *hbox = new wxBoxSizer(wxHORIZONTAL);\n\tbasePanel->SetSizer(hbox);\n\n\twxPanel *leftPanel = new wxPanel(basePanel, -1);\t\n\twxBoxSizer *vbox1 = new wxBoxSizer(wxVERTICAL);\n\tleftPanel->SetSizer(vbox1);\n\n\twxPanel *rightPanel = new wxPanel(basePanel, -1);\t\n\twxBoxSizer *vbox2 = new wxBoxSizer(wxVERTICAL);\n\trightPanel->SetSizer(vbox2);\n\n\tmList = new wxListBox(leftPanel,-1, wxDefaultPosition, wxDefaultSize);\n\tvbox1->Add(mList, 1, wxEXPAND);\n\n\twxButton *btnAdd = new wxButton(rightPanel, -1, wxT("Add"));\n\twxButton *btnEdit = new wxButton(rightPanel, -1, wxT("Edit"));\n\twxButton *btnDelete = new wxButton(rightPanel, -1, wxT("Delete"));\n\twxButton *btnClear = new wxButton(rightPanel, -1, wxT("Clear"));\n\n\tbtnAdd->Bind(wxEVT_BUTTON, &ListBox::onAdd, this);\n\tbtnEdit->Bind(wxEVT_BUTTON, &ListBox::onEdit, this);\n\tbtnDelete->Bind(wxEVT_BUTTON, &ListBox::onDelete, this);\n\tbtnClear->Bind(wxEVT_BUTTON, &ListBox::onClear, this);\n\t\n\tvbox2->Add(btnAdd, 1, wxEXPAND | wxALL, 5);\n\tvbox2->Add(btnEdit, 1, wxEXPAND | wxALL, 5);\n\tvbox2->Add(btnDelete, 1, wxEXPAND | wxALL, 5);\n\tvbox2->Add(btnClear, 1, wxEXPAND | wxALL, 5);\n\n\thbox->Add(leftPanel, 2, wxEXPAND | wxALL, 5);\n\thbox->Add(rightPanel, 1, wxEXPAND | wxALL, 5);\n\n\tCenter();\n}\n\nvoid ListBox::onAdd(wxCommandEvent &event) {\n\twxString string = wxGetTextFromUser(wxT("Add new Item"));\n\tif (string != "") {\n\t\tmList->Append(string);\n\t}\n}\nvoid ListBox::onEdit(wxCommandEvent &event) {\n\tint selected = mList->GetSelection();\n\tif (selected == -1) {\n\t  wxMessageDialog *dlg = new wxMessageDialog(NULL, wxT("No item has been selected in the listbox"), wxT(""));\n\t  dlg->ShowModal();\n\t  return;\n\t}\n\twxString selString = mList->GetString(selected);\n\twxString changed = wxGetTextFromUser(wxT("Edit"), wxT(""), selString);\n\tif (changed != "") {\n\t\tmList->Delete(selected);\n\t\tmList->Insert(changed, selected);\n\t}\n}\n\nvoid ListBox::onDelete(wxCommandEvent &event) {\n\tint selected = mList->GetSelection();\n\tif (selected == -1) {\n\t  wxMessageDialog *dlg = new wxMessageDialog(NULL, wxT("No item has been selected in the listbox"), wxT(""));\n\t  dlg->ShowModal();\n\t  return;\n\t}\n\tmList->Delete(selected);\n\n}\n\nvoid ListBox::onClear(wxCommandEvent &event) {\n\t wxMessageDialog* dial = new wxMessageDialog(NULL, wxT("Are you sure?"), wxT(""),\n\t\t\t\t wxYES_NO | wxNO_DEFAULT | wxICON_QUESTION);\n\t int retVal = dial->ShowModal();\n\t if (retVal == wxID_YES) {\n\t \tmList->Clear();\n\t }\n}\n\n<\/pre><\/div>\n\n\n
main.h<\/pre>\n\n\n
\n#include <wx\/wxprec.h>\n#ifndef WX_PRECOMP\n\t#include <wx\/wx.h>\n#endif\n\nclass Main: public wxApp {\n\n\tpublic:\n\t\tvirtual bool OnInit();\n};\n<\/pre><\/div>\n\n\n
main.cpp<\/pre>\n\n\n
\n#include "main.h"\n#include "wxlistbox.h"\n\nIMPLEMENT_APP(Main)\n\nbool Main::OnInit() {\n\tListBox *app = new ListBox(wxT("ListBox"));\n\tapp->Show(true);\n\n}\n\n<\/pre><\/div>\n\n\n
The output is shown below<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
OVERVIEW A wxListBox is a list which displays strings as items. It can select either a single item or multiple items. In the code below, […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":3595,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[302,365],"tags":[],"class_list":["post-4098","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\/4098","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=4098"}],"version-history":[{"count":2,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/posts\/4098\/revisions"}],"predecessor-version":[{"id":4103,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/posts\/4098\/revisions\/4103"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/media\/3595"}],"wp:attachment":[{"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/media?parent=4098"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/categories?post=4098"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/truelogic.org\/wordpress\/wp-json\/wp\/v2\/tags?post=4098"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}