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◆ main openmsx / src / imgui / FileListWidget.cc
6.6 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "FileListWidget.hh"
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#include "ImGuiCpp.hh"
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#include "ImGuiUtils.hh"
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#include "FileContext.hh"
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#include "FileOperations.hh"
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#include "foreach_file.hh"
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#include "zstring_view.hh"
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#include <array>
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#include <cassert>
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#include <filesystem>
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#include <span>
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namespace openmsx {
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static std::string_view formatFileTimeFull(std::time_t fileTime, std::span<char, 32> buf)
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{
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	// Convert time_t to local time (broken-down time in the local time zone)
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	const std::tm* local_time = std::localtime(&fileTime);
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	// Get the local time in human-readable format
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	auto len = std::strftime(buf.data(), buf.size(), "%F %T", local_time);
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	assert(len > 0); // buf.size == 32 should always be sufficient for this format
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	return {buf.data(), len};
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}
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static std::string_view formatFileAbbreviated(std::time_t fileTime, std::span<char, 32> buf)
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{
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	// Convert time_t to local time (broken-down time in the local time zone)
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	std::tm local_time = *std::localtime(&fileTime);
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	std::time_t t_now = std::time(nullptr); // get time now
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	std::tm now = *std::localtime(&t_now);
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	auto format = ((now.tm_mday == local_time.tm_mday) &&
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	               (now.tm_mon  == local_time.tm_mon ) &&
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	               (now.tm_year == local_time.tm_year)) ? zstring_view("%T") : zstring_view("%F");
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	// Get the local time in human-readable format
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	auto len = std::strftime(buf.data(), buf.size(), format.c_str(), &local_time);
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	assert(len > 0); // buf.size == 32 should always be sufficient for these formats
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	return {buf.data(), len};
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};
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FileListWidget::FileListWidget(
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		std::string_view fileType_, std::string_view extension_, std::string_view directory_)
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	: fileType(fileType_), extension(extension_), directory(directory_)
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	, confirmDelete(strCat("Confirm delete##filelist-", fileType))
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{
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	// setup default actions
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	drawAction = [&] { drawTable(); };
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	hoverAction = [this](const Entry& entry) { defaultHoverAction(entry); };
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	deleteAction = [](const Entry& entry) { defaultDeleteAction(entry); };
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	displayName = [](const Entry& entry) { return std::string(entry.getDefaultDisplayName()); };
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}
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bool FileListWidget::menu(const char* text)
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{
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	menuOpen = im::Menu(text, [&]{ draw(); });
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	return menuOpen;
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}
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bool FileListWidget::menu(const char* text, bool enabled)
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{
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	menuOpen = im::Menu(text, enabled, [&]{ draw(); });
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	return menuOpen;
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}
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void FileListWidget::draw()
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{
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	if (!menuOpen) scanDirectory(); // only re-scan on transition from closed -> open
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	drawAction(); // calls drawTable() (and possibly does more)
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}
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void FileListWidget::defaultHoverAction(const Entry& entry) const
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{
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	simpleToolTip(displayName(entry));
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}
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std::string_view FileListWidget::Entry::getDefaultDisplayName() const
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{
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	return FileOperations::stem(fullName);
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}
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void FileListWidget::defaultDeleteAction(const Entry& entry) {
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	FileOperations::unlink(entry.fullName);
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}
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[[nodiscard]] static time_t fileTimeToTimeT(std::filesystem::file_time_type fileTime)
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{
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	// As we still want to support gcc-11 (and not require 13 yet), we have to use this method
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	// as workaround instead of using more modern std::chrono and std::format stuff in all time
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	// calculations and formatting.
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	// Convert file_time_type to system_clock::time_point (the standard clock since epoch)
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	auto sctp = std::chrono::time_point_cast<std::chrono::system_clock::duration>(
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		fileTime - std::filesystem::file_time_type::clock::now() +
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		std::chrono::system_clock::now());
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	// Convert system_clock::time_point to time_t (time since Unix epoch in seconds)
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	return std::chrono::system_clock::to_time_t(sctp);
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}
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void FileListWidget::scanDirectory()
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{
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	entries.clear();
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	for (auto context = userDataFileContext(directory);
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	     const auto& path : context.getPaths()) {
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		foreach_file(path, [&](const std::string& fullName, std::string_view fileName) {
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			if (fileName.ends_with(extension)) {
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				std::filesystem::file_time_type ftime = std::filesystem::last_write_time(fullName);
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				entries.emplace_back(fullName, fileTimeToTimeT(ftime));
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			}
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		});
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	}
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	needSort = true;
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}
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void FileListWidget::drawTable()
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{
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	if (entries.empty()) {
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		ImGui::TextUnformatted(tmpStrCat("No ", fileType, " files found"));
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		return;
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	}
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	int tableFlags = ImGuiTableFlags_RowBg |
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		ImGuiTableFlags_BordersV |
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		ImGuiTableFlags_BordersOuter |
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		ImGuiTableFlags_Resizable |
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		ImGuiTableFlags_Sortable |
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		ImGuiTableFlags_Hideable |
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		ImGuiTableFlags_Reorderable |
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		ImGuiTableFlags_ContextMenuInBody |
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		ImGuiTableFlags_ScrollY |
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		ImGuiTableFlags_SizingStretchProp;
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	im::Table("##select-filelist", 2, tableFlags, ImVec2(ImGui::GetFontSize() * 25.0f, 240.0f), [&]{
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		ImGui::TableSetupScrollFreeze(0, 1); // Make top row always visible
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		ImGui::TableSetupColumn("Name");
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		ImGui::TableSetupColumn("Date/time", ImGuiTableColumnFlags_DefaultSort | ImGuiTableColumnFlags_PreferSortDescending | ImGuiTableColumnFlags_WidthFixed);
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		ImGui::TableHeadersRow();
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		// check sort order
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		if (auto* sortSpecs = ImGui::TableGetSortSpecs();
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		    sortSpecs->SpecsDirty || needSort) {
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			sortSpecs->SpecsDirty = false;
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			needSort = false;
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			assert(sortSpecs->SpecsCount == 1);
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			assert(sortSpecs->Specs);
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			assert(sortSpecs->Specs->SortOrder == 0);
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			switch (sortSpecs->Specs->ColumnIndex) {
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			case 0: // name
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				sortUpDown_String(entries, sortSpecs, &FileListWidget::Entry::getDefaultDisplayName);
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				break;
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			case 1: // time
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				sortUpDown_T(entries, sortSpecs, &FileListWidget::Entry::ftime);
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				break;
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			default:
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				UNREACHABLE;
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			}
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		}
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		for (const auto& entry : entries) {
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			if (ImGui::TableNextColumn()) {
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				imColor color = displayColor ? displayColor(entry) : imColor::TEXT;
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				im::StyleColor(ImGuiCol_Text, getColor(color), [&]{
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					if (ImGui::Selectable(displayName(entry).c_str(), false, ImGuiSelectableFlags_SpanAllColumns | ImGuiSelectableFlags_AllowOverlap | (doubleClickAction ? ImGuiSelectableFlags_AllowDoubleClick : 0))) {
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						if (ImGui::IsMouseDoubleClicked(ImGuiMouseButton_Left)) {
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							doubleClickAction(entry);
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						} else {
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							singleClickAction(entry);
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						}
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					}
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				});
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				if (hoverAction && ImGui::IsItemHovered(ImGuiHoveredFlags_DelayShort)) {
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					hoverAction(entry);
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				}
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				if (deleteAction) {
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					im::PopupContextItem([&]{
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						if (ImGui::MenuItem("delete")) {
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							confirmDelete.open(
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								strCat("Delete ", fileType, " file '", entry.getDefaultDisplayName(), "'?"),
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								[entry, this]{
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									deleteAction(entry);
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									scanDirectory();
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								});
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						}
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					});
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				}
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			}
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			if (ImGui::TableNextColumn()) {
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				std::array<char, 32> buf;
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				ImGui::TextUnformatted(formatFileAbbreviated(entry.ftime, buf));
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				simpleToolTip([&] { return formatFileTimeFull(entry.ftime, buf); });
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			}
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	}});
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	confirmDelete.execute();
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}
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} // namespace openmsx