(C++) WtSelectFileDialog

 

 

WtSelectFileDialog is a Wt class to let a user select a file from the server. To let a user select a file from his/her computer, the Wt::WFileUpload class might be convenient.

 

TestSelectFileDialog is a tool to test the WtSelectFileDialog class.

Technical facts

 

 

 

 

 

 

./CppWtSelectFileDialog/CppWtSelectFileDialog.pri

 

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INCLUDEPATH += \     ../../Classes/CppWtSelectFileDialog SOURCES += \     ../../Classes/CppWtSelectFileDialog/wtselectfiledialog.cpp HEADERS  += \     ../../Classes/CppWtSelectFileDialog/wtselectfiledialog.h OTHER_FILES += \     ../../Classes/CppWtSelectFileDialog/Licence.txt

 

 

 

 

 

./CppWtSelectFileDialog/wtselectfiledialog.h

 

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//--------------------------------------------------------------------------- /* WtSelectFileDialog, Wt dialog for selecting a file Copyright 2011-2015 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program.If not, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppWtSelectFileDialog.htm //--------------------------------------------------------------------------- #ifndef WTSELECTFILEDIALOG_H #define WTSELECTFILEDIALOG_H #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-variable" #include <boost/signals2.hpp> #include <Wt/WContainerWidget> #pragma GCC diagnostic pop namespace Wt {   struct WLineEdit;   struct WPushButton;   struct WSelectionBox; } namespace ribi { ///WtSelectFileDialog is a Wt dialog to select a file struct WtSelectFileDialog : public Wt::WContainerWidget {   WtSelectFileDialog();   WtSelectFileDialog(const WtSelectFileDialog&) = delete;   WtSelectFileDialog& operator=(const WtSelectFileDialog&) = delete;   virtual ~WtSelectFileDialog() {}   ///Check the folder for files again   void DoRefresh();   ///Get the path in which this class will look for files   static const std::string& GetPath() { return m_path; }   ///Get the currently selected file   std::string GetSelectedFile() const;   ///Get the version of this class   static std::string GetVersion();   ///Get the version history of this class   static std::vector<std::string> GetVersionHistory();   ///Set the regex filter filenames are selected for   void SetFilter(const std::string& filename_filter);   ///Set if the regex filter is readonly   void SetFilterReadOnly(const bool readonly);   ///Set the path in which this class will look for files   static void SetPath(const std::string& path);   ///The signal that is emitted when a file is selected   boost::signals2::signal<void ()> m_signal_selected; protected:   ///The path this dialog starts at   static std::string m_path;   ///The user interface of this class   struct Ui   {     Ui();     Ui(const Ui&) = delete;     Ui& operator=(const Ui&) = delete;     Wt::WLineEdit * const m_edit_filter;     Wt::WLabel * const m_label_filter;     Wt::WSelectionBox * const m_selection_box;   } m_ui;   ///Get all the files in a folder   //From http://www.richelbilderbeek.nl/CppGetFilesInFolder.htm   //static std::vector<std::string> GetFilesInFolder(const std::string& folder);   ///\brief   ///The member function how to select files from a folder   ///   ///default behavior: select all files in the folder m_path that match the regex in m_edit_filter   virtual std::vector<std::string> SelectFiles() const noexcept;   ///\brief   ///OnUpdateDialog updates the list of filenames in the m_selection_box   ///   ///OnUpdateDialog is called automatically when the selection filter is changed   void OnUpdateDialog(); private:   ///OnSelect is called when a client selected a file   void OnSelect(); }; } //~namespace ribi #endif // WTSELECTFILEDIALOG_H

 

 

 

 

 

./CppWtSelectFileDialog/wtselectfiledialog.cpp

 

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//--------------------------------------------------------------------------- /* WtSelectFileDialog, Wt dialog for selecting a file Copyright 2011-2015 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program.If not, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppWtSelectFileDialog.htm //--------------------------------------------------------------------------- #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-variable" #include "wtselectfiledialog.h" #include <boost/xpressive/xpressive.hpp> #include <Wt/WBreak> #include <Wt/WLabel> #include <Wt/WLineEdit> #include <Wt/WSelectionBox> #include "fileio.h" #include "trace.h" #pragma GCC diagnostic pop ///The path this dialog starts at std::string ribi::WtSelectFileDialog::m_path = ""; ribi::WtSelectFileDialog::Ui::Ui() : m_edit_filter(new Wt::WLineEdit(".*")),    m_label_filter(new Wt::WLabel("File filter: ")),    m_selection_box(new Wt::WSelectionBox) { } ribi::WtSelectFileDialog::WtSelectFileDialog()   : m_signal_selected{},     m_ui{} {   assert(!m_path.empty()     && "Path must be set from argv[0]:"     && "ribi::WtSelectFileDialog::SetPath(boost::filesystem::path(argv[0]).parent_path().string());");   clear();   setContentAlignment(Wt::AlignCenter);   this->addWidget(m_ui.m_selection_box);   this->addWidget(new Wt::WBreak);   this->addWidget(m_ui.m_label_filter);   this->addWidget(m_ui.m_edit_filter);   m_ui.m_edit_filter->changed().connect(this,     &ribi::WtSelectFileDialog::OnUpdateDialog);   m_ui.m_edit_filter->enterPressed().connect(this,     &ribi::WtSelectFileDialog::OnUpdateDialog);   m_ui.m_edit_filter->keyWentUp().connect(this,     &ribi::WtSelectFileDialog::OnUpdateDialog);   m_ui.m_selection_box->activated().connect(this,     &ribi::WtSelectFileDialog::OnSelect);   m_ui.m_selection_box->clicked().connect(this,     &ribi::WtSelectFileDialog::OnSelect);   m_ui.m_selection_box->doubleClicked().connect(this,     &ribi::WtSelectFileDialog::OnSelect);   m_ui.m_selection_box->setSelectionMode(Wt::SingleSelection);   m_ui.m_selection_box->resize(400,Wt::WLength::Auto);   OnUpdateDialog(); } void ribi::WtSelectFileDialog::DoRefresh() {   OnUpdateDialog(); } //const std::vector<std::string> ribi::WtSelectFileDialog::GetFilesInFolder(const std::string& folder) //{ //  assert(!m_path.empty() && "Path must be set from argv[0]"); //  return fileio::FileIo().GetFilesInFolder(m_path); //} std::string ribi::WtSelectFileDialog::GetSelectedFile() const {   if (m_ui.m_selection_box->currentIndex() == -1) return std::string();   return m_ui.m_selection_box->itemText(m_ui.m_selection_box->currentIndex()).toUTF8(); } std::string ribi::WtSelectFileDialog::GetVersion() {   return "1.5"; } std::vector<std::string> ribi::WtSelectFileDialog::GetVersionHistory() {   return {     "2011-07-01: version 1.0: initial version",     "2011-07-01: version 1.1: added support for setting the regex filter",     "2011-07-03: version 1.2: added support for setting the regex filter to readonly",     "2011-07-15: version 1.3: added GetPath member function, removed \'Select\' Wt::WPushButton",     "2011-10-16: version 1.4: put UI elements in Ui struct, added virtual SelectFiles member function (for Hometrainer)",     "2011-10-24: version 1.5: added DoRefresh member function"   }; } void ribi::WtSelectFileDialog::OnUpdateDialog() {   m_ui.m_selection_box->clear();   const std::vector<std::string> v = SelectFiles();   for(const auto s: v)   {     m_ui.m_selection_box->addItem(s.c_str());   } } void ribi::WtSelectFileDialog::OnSelect() {   if (m_ui.m_selection_box->currentIndex() == -1) return;   m_signal_selected(); } std::vector<std::string> ribi::WtSelectFileDialog::SelectFiles() const noexcept {   try   {     boost::xpressive::sregex::compile(m_ui.m_edit_filter->text().toUTF8());   }   catch(boost::xpressive::regex_error& e)   {     return std::vector<std::string>();   }   catch (...)   {     assert(!"Should not get here");   }   //Get all filenames   const std::vector<std::string> v = fileio::FileIo().GetFilesInFolder(m_path);   //Create the regex for a correct text file   const boost::xpressive::sregex txt_file_regex     = boost::xpressive::sregex::compile(m_ui.m_edit_filter->text().toUTF8());   std::vector<std::string> w;   //Copy_if(v.begin(),v.end(),   //  std::back_inserter(w),   //    boost::regex_match(boost::bind(boost::lambda::_1),txt_file_regex));   //Copy all filenames matching the regex in the resulting std::vector   for(const auto s: v)   {     if (boost::xpressive::regex_match(s,txt_file_regex))     {       w.push_back(s);     }   }   std::sort(w.begin(),w.end());   return w; } void ribi::WtSelectFileDialog::SetFilter(const std::string& filename_filter) {   m_ui.m_edit_filter->setText(filename_filter.c_str());   OnUpdateDialog(); } void ribi::WtSelectFileDialog::SetFilterReadOnly(const bool readonly) {   m_ui.m_edit_filter->setReadOnly(readonly); } void ribi::WtSelectFileDialog::SetPath(const std::string& path) {   m_path = path; }