From 6d88a57712939ab2169f717f54149d1ea82acb42 Mon Sep 17 00:00:00 2001
From: peri4 <peri4ko@yandex.ru>
Date: Thu, 1 Jul 2021 22:25:27 +0300
Subject: [PATCH] filesystem watching optimization

---
 project_fs/projectfilesystemwidget.cpp | 42 ++++++++++++++++++--------
 project_fs/projectfilesystemwidget.h   |  4 ++-
 2 files changed, 32 insertions(+), 14 deletions(-)

diff --git a/project_fs/projectfilesystemwidget.cpp b/project_fs/projectfilesystemwidget.cpp
index b797992..3de59c7 100644
--- a/project_fs/projectfilesystemwidget.cpp
+++ b/project_fs/projectfilesystemwidget.cpp
@@ -105,7 +105,7 @@ void ProjectFilesystemWidget::setCurrentFilter(const FilterDialog::Filter & v) {
 }
 
 
-void ProjectFilesystemWidget::changeEvent(QEvent *e) {
+void ProjectFilesystemWidget::changeEvent(QEvent * e) {
 	QWidget::changeEvent(e);
 	switch (e->type()) {
 	case QEvent::LanguageChange:
@@ -117,6 +117,30 @@ void ProjectFilesystemWidget::changeEvent(QEvent *e) {
 }
 
 
+void ProjectFilesystemWidget::timerEvent(QTimerEvent * e) {
+	if (timer_fs_changed > 0)
+		killTimer(timer_fs_changed);
+	timer_fs_changed = 0;
+	int spos = tree->verticalScrollBar()->value();
+	last_expanded.clear();
+	rememberExpanded(tree->invisibleRootItem());
+	for (QString path: fs_changed) {
+		QTreeWidgetItem * ti = item_map.value(path);
+		//QMessageBox::information(0, "", "changed " + path + " " + QString::number((qulonglong)ti));
+		if (ti) {
+			createTree(ti, path, false);
+			cleanMappedItems();
+		}
+	}
+	filter();
+	restoreExpanded(tree->invisibleRootItem());
+	fs_changed.clear();
+	currentFileChanged();
+	tree->verticalScrollBar()->setValue(spos);
+	QWidget::timerEvent(e);
+}
+
+
 void ProjectFilesystemWidget::projectNameChanged() {
 	for (int i = 0; i < tree->topLevelItemCount(); ++i) {
 		ProjectExplorer::Project * p = (ProjectExplorer::Project *)itemProject(tree->topLevelItem(i));
@@ -350,18 +374,10 @@ void ProjectFilesystemWidget::cleanMappedItems() {
 
 
 void ProjectFilesystemWidget::directoryChanged(const QString & path) {
-	QTreeWidgetItem * ti = item_map.value(path);
-	//QMessageBox::information(0, "", "changed " + path + " " + QString::number((qulonglong)ti));
-	if (!ti) return;
-	int spos = tree->verticalScrollBar()->value();
-	last_expanded.clear();
-	rememberExpanded(tree->invisibleRootItem());
-	createTree(ti, path, false);
-	filter();
-	restoreExpanded(tree->invisibleRootItem());
-	cleanMappedItems();
-	tree->verticalScrollBar()->setValue(spos);
-	currentFileChanged();
+	if (timer_fs_changed > 0)
+		killTimer(timer_fs_changed);
+	timer_fs_changed = startTimer(500);
+	fs_changed << path;
 	//QMessageBox::information(0, "", "map " + QString::number(ais.size()));
 	//QMessageBox::information(0, "", "remove " + removed);
 }
diff --git a/project_fs/projectfilesystemwidget.h b/project_fs/projectfilesystemwidget.h
index 12e027d..d55f6d3 100644
--- a/project_fs/projectfilesystemwidget.h
+++ b/project_fs/projectfilesystemwidget.h
@@ -28,6 +28,7 @@ public:
 
 protected:
 	void changeEvent(QEvent * e);
+	void timerEvent(QTimerEvent * e);
 	void createTree(QTreeWidgetItem * ti, const QString & dir, bool proc_events = true);
 	void createProjectTree(void * p);
 	void projectNameChanged();
@@ -42,11 +43,12 @@ protected:
 	void cleanMappedItems();
 
 	bool in_proc, need_rebuild;
+	int timer_fs_changed = 0;
 	ExtensionSystem::IPlugin * proj_plug;
 	QMenu popup_menu;
 	QList<QAction*> this_actions;
 	QMap<QString, QTreeWidgetItem*> item_map;
-	QSet<QString> last_expanded;
+	QSet<QString> last_expanded, fs_changed;
 	FilterDialog filter_dialog;
 	FilterDialog::Filter cur_filter;
 	QElapsedTimer tm;