Show UnsavedDocumentsDialog when closing window or quitting application

so user can save and or discard docs more efficiently.

pglab/CMakeLists.txt

@@ -34,6 +34,9 @@ set(PGLAB_SOURCES
     querytool/QueryExplainModel.cpp
     querytool/QueryParamListController.cpp
     querytool/QueryTool.cpp
+    querytool/SqlDocument.cpp
+    querytool/SqlDocumentRegistry.cpp
+    querytool/UnsavedDocumentsDialog.cpp
     serverinspector/DatabasesPage.cpp
     serverinspector/RolesPage.cpp
     serverinspector/ServerInspector.cpp

pglab/ConnectionManagerWindow.cpp

@@ -62,7 +62,7 @@ void ConnectionManagerWindow::on_actionQuit_application_triggered()
 {
 	auto res = QMessageBox::question(this, "pglab",
 		tr("Close all windows?"), QMessageBox::Yes, QMessageBox::No);
-	if (res == QMessageBox::Yes) {
+	if (res == QMessageBox::Yes && m_masterController->confirmQuit(this)) {
 		QApplication::quit();
 	}
 }

pglab/DatabaseWindow.cpp

@@ -20,10 +20,13 @@
 #include <QStandardPaths>
 #include <QStatusBar>
 #include <QTableView>
+#include <QApplication>
+#include <QInputDialog>
 
 #include "EditTableWidget.h"
 #include "CodeGenerator.h"
 #include "querytool/QueryTool.h"
+#include "querytool/UnsavedDocumentsDialog.h"
 #include <serverinspector/ServerInspector.h>
 
 namespace pg = Pgsql;
@@ -91,12 +94,18 @@ void DatabaseWindow::closeEvent(QCloseEvent *event)
 {
     for (int idx = 0; idx < ui->mainTabs->count(); ++idx)
     {
-        if (!canCloseTab(idx))
+        auto mp = dynamic_cast<ManagedPage*>(ui->mainTabs->widget(idx));
+        if (mp && !dynamic_cast<QueryTool*>(mp) && !mp->CanClose(true))
         {
             event->ignore();
             return;
         }
-	}
+    }
+
+    auto docs = documentsClosedWith(m_masterController->sqlDocumentRegistry().modifiedDocuments(),
+        [this](const QWidget *editor) { return editor->window() == this; });
+    if (!confirmClose(this, docs))
+        event->ignore();
 }
 
 void DatabaseWindow::setConfig(const ConnectionConfig &config)
@@ -199,14 +208,14 @@ void DatabaseWindow::openSqlFile(QString file_name)
 {
     if (!file_name.isEmpty())
     {
-        auto *ct = new QueryTool(this, this);
-        if (ct->load(file_name))
+        auto document = std::make_shared<SqlDocument>();
+        if (document->load(file_name))
         {
+            m_masterController->sqlDocumentRegistry().add(document);
+            auto *ct = new QueryTool(this, document, this);
             ct->addAction(ui->actionExecute_query);
             addPage(ct, ct->title());
         }
-        else
-            delete ct;
     }
 }
 
@@ -391,13 +400,53 @@ void DatabaseWindow::on_actionInspect_server_triggered()
     newServerInspectorPage();
 }
 
+void DatabaseWindow::openSharedSqlDocument(std::shared_ptr<SqlDocument> document)
+{
+    auto *ct = new QueryTool(this, std::move(document), this);
+    ct->addAction(ui->actionExecute_query);
+    addPage(ct, ct->title());
+    ct->updateTitle();
+}
+
 void DatabaseWindow::on_actionNew_Query_triggered()
 {
-    auto *ct = new QueryTool(this, this);
+    auto document = std::make_shared<SqlDocument>();
+    m_masterController->sqlDocumentRegistry().add(document);
+    auto *ct = new QueryTool(this, document, this);
     ct->addAction(ui->actionExecute_query);
     addPage(ct, "new");
-    ct->newdoc();
+}
 
+void DatabaseWindow::on_actionOpen_in_other_window_triggered()
+{
+    auto ct = dynamic_cast<QueryTool*>(ui->mainTabs->currentWidget());
+    if (!ct)
+        return;
+
+    QList<DatabaseWindow*> others;
+    for (auto *widget : QApplication::topLevelWidgets()) {
+        auto dw = qobject_cast<DatabaseWindow*>(widget);
+        if (dw && dw != this && dw->isVisible())
+            others.append(dw);
+    }
+
+    if (others.isEmpty()) {
+        QMessageBox::information(this, "pglab", tr("No other window is open."));
+        return;
+    }
+
+    QStringList names;
+    for (int i = 0; i < others.size(); ++i)
+        names.append(QString("%1 (%2)").arg(others[i]->windowTitle()).arg(i + 1));
+
+    bool ok = false;
+    QString selected = QInputDialog::getItem(this, tr("Open in other window"),
+        tr("Select window:"), names, 0, false, &ok);
+    if (!ok)
+        return;
+
+    auto target = others[names.indexOf(selected)];
+    target->openSharedSqlDocument(ct->document());
 }
 
 void DatabaseWindow::on_actionOpen_Query_triggered()

pglab/DatabaseWindow.h

@@ -6,6 +6,7 @@
 #include "OpenDatabase.h"
 #include "Pgsql_Connection.h"
 #include "IDatabaseWindow.h"
+#include "querytool/SqlDocument.h"
 #include <QMainWindow>
 #include <memory>
 
@@ -38,6 +39,7 @@ public:
 	~DatabaseWindow();
 
 	void setConfig(const ConnectionConfig &config);
+	void openSharedSqlDocument(std::shared_ptr<SqlDocument> document);
 
 	std::shared_ptr<OpenDatabase> getDatabase() { return m_database; }
 
@@ -98,6 +100,7 @@ private slots:
     void on_actionInspect_server_triggered();
     void on_actionNew_Query_triggered();
     void on_actionOpen_Query_triggered();
+    void on_actionOpen_in_other_window_triggered();
     void on_actionSave_Query_triggered();
     void on_actionPaste_lang_string_triggered();
     void on_actionRefreshCatalog_triggered();

pglab/DatabaseWindow.ui

@@ -43,6 +43,7 @@
     <addaction name="actionSave_Query"/>
     <addaction name="actionSave_query_as"/>
     <addaction name="actionSave_copy_of_query_as"/>
+    <addaction name="actionOpen_in_other_window"/>
     <addaction name="separator"/>
     <addaction name="actionSave_connection"/>
     <addaction name="actionExport_data"/>
@@ -106,6 +107,11 @@
    <addaction name="menuWindow"/>
    <addaction name="menuHelp"/>
   </widget>
+  <action name="actionOpen_in_other_window">
+   <property name="text">
+    <string>Open in other window / Duplicate in window...</string>
+   </property>
+  </action>
   <action name="actionAbout">
    <property name="icon">
     <iconset resource="resources.qrc">

pglab/MasterController.cpp

@@ -1,5 +1,6 @@
 #include "MasterController.h"
 #include "ConnectionController.h"
+#include "querytool/UnsavedDocumentsDialog.h"
 #include "utils/PostgresqlUrlParser.h"
 #include <ConnectionConfig.h>
 #include <QCoreApplication>
@@ -59,4 +60,9 @@ SQLiteConnection& MasterController::userConfigDatabase()
 	return m_userConfigDatabase;
 }
 
+bool MasterController::confirmQuit(QWidget *parent)
+{
+	return confirmClose(parent, m_sqlDocumentRegistry.modifiedDocuments());
+}
+
 

pglab/MasterController.h

@@ -7,6 +7,7 @@
 #include <map>
 #include <memory>
 #include "sqlite/SQLiteConnection.h"
+#include "querytool/SqlDocumentRegistry.h"
 
 
 class ConnectionController;
@@ -24,6 +25,10 @@ public:
 
 	ConnectionController* connectionController();
     SQLiteConnection& userConfigDatabase();
+
+    SqlDocumentRegistry& sqlDocumentRegistry() { return m_sqlDocumentRegistry; }
+    /// Asks once about all modified documents of all windows. Returns false when quitting must be aborted.
+    bool confirmQuit(QWidget *parent);
     
 signals:
 
@@ -31,6 +36,7 @@ public slots:
 
 private:
     SQLiteConnection m_userConfigDatabase;
+    SqlDocumentRegistry m_sqlDocumentRegistry;
 	ConnectionController* m_connectionController = nullptr;
 };
 

pglab/querytool/QueryTool.cpp

@@ -21,12 +21,16 @@
 #include "util.h"
 #include "UserConfiguration.h"
 #include "IDatabaseWindow.h"
+#include "UnsavedDocumentsDialog.h"
+#include <QPlainTextDocumentLayout>
+#include <QTextDocument>
 
 
-QueryTool::QueryTool(IDatabaseWindow *context, QWidget *parent)
+QueryTool::QueryTool(IDatabaseWindow *context, std::shared_ptr<SqlDocument> document, QWidget *parent)
 	: ManagedPage(parent)
 	, m_context(context)
 	, ui(new Ui::QueryTab)
+	, m_document(std::move(document))
 	, m_dbConnection()
 {
 	ui->setupUi(this);
@@ -40,13 +44,15 @@ QueryTool::QueryTool(IDatabaseWindow *context, QWidget *parent)
   
 	ui->queryEdit->setFont(UserConfiguration::instance()->codeFont());
 
-	highlighter = new SqlSyntaxHighlighter(ui->queryEdit->document());
+	ui->queryEdit->setDocument(m_document->textDocument());
+	m_document->addEditor(this);
 	auto types = m_catalog->types();
 	if (types) {
-		highlighter->setTypes(*types);
+		m_document->highlighter()->setTypes(*types);
 	}
 
-	connect(ui->queryEdit, &QPlainTextEdit::textChanged, this, &QueryTool::queryTextChanged);
+	connect(m_document.get(), &SqlDocument::modifiedChanged, this, &QueryTool::updateTitle);
+	connect(m_document.get(), &SqlDocument::fileNameChanged, this, &QueryTool::updateTitle);
     ui->queryEdit->setAcceptDrops(false);
 
 	m_queryParamListController = new QueryParamListController(ui->paramTableView, m_context->openDatabase(), this);
@@ -60,87 +66,42 @@ QueryTool::QueryTool(IDatabaseWindow *context, QWidget *parent)
 
 QueryTool::~QueryTool()
 {
+	// Detach the editor from the shared document, it may be destroyed together with this tool
+	auto detached = new QTextDocument(ui->queryEdit);
+	detached->setDocumentLayout(new QPlainTextDocumentLayout(detached));
+	ui->queryEdit->setDocument(detached);
+	m_document->removeEditor(this);
 	delete ui;
 }
 
 bool QueryTool::CanClose(bool prompt_user)
 {
-	bool can_close;
-	if (m_queryTextChanged) {
-		if (prompt_user)
-			can_close = continueWithoutSavingWarning();
-		else
-			can_close = false;
-	}
-	else {
-		can_close = true;
-	}
-	return can_close;
-}
+	if (!m_document->isModified())
+		return true;
 
-void QueryTool::newdoc()
-{
-	ui->queryEdit->clear();
-	setFileName(tr("new"));
-    setQueryTextChanged(false);
-	m_new = true;
-}
+	// The document stays open in another editor, so it is not closed with this tool
+	if (m_document->editors().size() > 1)
+		return true;
 
-bool QueryTool::load(const QString &filename)
-{
-	bool result = false;
-	QFile file(filename);
-	if (file.open(QIODevice::ReadOnly)) {
-		QByteArray ba = file.readAll();
-        auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
-        QString text = toUtf16(ba);
-        if (toUtf16.hasError()) {
-			file.reset();
-			QTextStream stream(&file);
-			text = stream.readAll();
-		}
+	if (!prompt_user)
+		return false;
 
-		ui->queryEdit->setPlainText(text);
-        setQueryTextChanged(false);
-		setFileName(filename);
-		m_new = false;
-		result = true;
-	}
-	return result;
+	return confirmClose(this, {m_document});
 }
 
 bool QueryTool::save()
 {
-	bool result;
-	if (m_fileName.isEmpty() || m_new) {
-		result = saveAs();
-	}
-	else {
-		result = saveSqlTo(m_fileName);
-	}
-	return result;
+	return m_document->save(this);
 }
 
 bool QueryTool::saveAs()
 {
-	bool result = false;
-	QString filename = promptUserForSaveSqlFilename();
-	if (!filename.isEmpty()) {
-		result = saveSqlTo(filename);
-		if (result) {
-			setFileName(filename);
-			m_new = false;
-		}
-	}
-	return result;
+	return m_document->saveAs(this);
 }
 
 void QueryTool::saveCopyAs()
 {
-	QString filename = promptUserForSaveSqlFilename();
-	if (!filename.isEmpty()) {
-		saveSqlTo(filename);
-	}
+	m_document->saveCopyAs(this);
 }
 
 void QueryTool::execute()
@@ -245,81 +206,21 @@ void QueryTool::cancel()
 
 QString QueryTool::title() const
 {
-	QFileInfo fileInfo(m_fileName);
+	QFileInfo fileInfo(m_document->fileName());
 	QString fn(fileInfo.fileName());
 	return fn;
 }
 
-void QueryTool::setFileName(const QString &filename)
-{
-	m_fileName = filename;
-    updateTitle();
-}
-
 void QueryTool::updateTitle()
 {
-    QFileInfo fileInfo(m_fileName);
+    QFileInfo fileInfo(m_document->fileName());
     QString title = fileInfo.fileName();
 
-    if (m_queryTextChanged) {
+    if (m_document->isModified()) {
         title = "*" + title;
     }
 
-    m_context->setTitleForWidget(this, title, m_fileName);
-}
-
-bool QueryTool::continueWithoutSavingWarning()
-{
-	QMessageBox msgBox;
-	msgBox.setIcon(QMessageBox::Warning);
-	msgBox.setText(QString("Save changes in document \"%1\" before closing?").arg(m_fileName));
-	msgBox.setInformativeText("The changes will be lost when you choose Discard.");
-	msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
-	msgBox.setDefaultButton(QMessageBox::Cancel);
-	int ret = msgBox.exec();
-	if (ret == QMessageBox::Save) {
-		if (!save()) {
-			// save failed or was a saveAs and was cancelled, don't close!
-			ret = QMessageBox::Cancel;
-		}
-	}
-
-	return ret != QMessageBox::Cancel;
-}
-
-bool QueryTool::saveSqlTo(const QString &filename)
-{
-	bool result = false;
-	QFileInfo fileinfo(filename);
-
-
-	QFile file(filename);
-	if (file.open(QIODevice::WriteOnly)) {
-		QTextStream stream(&file);
-        //stream.setCodec("utf-8");
-        stream.setEncoding(QStringConverter::Utf8);
-        QString text = ui->queryEdit->toPlainText();
-		stream << text;
-
-		stream.flush();
-		if (stream.status() == QTextStream::Ok) {
-            setQueryTextChanged(false);
-			result = true;
-		}
-	}
-	return result;
-}
-
-
-QString QueryTool::promptUserForSaveSqlFilename()
-{
-	QString home_dir = QStandardPaths::locate(QStandardPaths::HomeLocation, "", QStandardPaths::LocateDirectory);
-	return QFileDialog::getSaveFileName(this, tr("Save query"), home_dir, tr("SQL file (*.sql)"));
-}
-
-void QueryTool::queryTextChanged()
-{
-    setQueryTextChanged(true);
+    m_context->setTitleForWidget(this, title, m_document->fileName());
 }
 
 void QueryTool::connectionStateChanged()
@@ -618,10 +519,3 @@ void QueryTool::exportData()
 	exportDataToFilename(file_name);
 }
 
-void QueryTool::setQueryTextChanged(bool queryTextChanged)
-{
-    if (m_queryTextChanged != queryTextChanged) {
-        m_queryTextChanged = queryTextChanged;
-        updateTitle();
-    }
-}

pglab/querytool/QueryTool.h

@@ -6,6 +6,7 @@
 #include "QueryExplainModel.h"
 #include "stopwatch.h"
 #include "tuplesresultwidget.h"
+#include "SqlDocument.h"
 
 #include <QWidget>
 #include <memory>
@@ -34,12 +35,9 @@ class PgDatabaseCatalog;
 class QueryTool : public ManagedPage {
 	Q_OBJECT
 public:
-	QueryTool(IDatabaseWindow *context, QWidget *parent = nullptr);
+	QueryTool(IDatabaseWindow *context, std::shared_ptr<SqlDocument> document, QWidget *parent = nullptr);
 	~QueryTool() override;
 
-	void newdoc();
-	bool load(const QString &filename);
-
 	void explain(bool analyze);
 
 	bool CanClose(bool prompt_user);
@@ -47,12 +45,12 @@ public:
 	void generateCode();
 	void exportDataToFilename(const QString &filename);
 
-	QString fileName() const { return m_fileName; }
-	bool isChanged() const { return m_queryTextChanged; }
-	bool isNew() const { return m_new; }
+	QString fileName() const { return m_document->fileName(); }
+	std::shared_ptr<SqlDocument> document() const { return m_document; }
 	void focusEditor();
 
 	QString title() const;
+	void updateTitle();
 
 
 public slots:
@@ -74,15 +72,12 @@ private:
 	using ResultTabContainer = std::vector<TuplesResultWidget*>;
 	IDatabaseWindow *m_context;
 	Ui::QueryTab *ui;
-	SqlSyntaxHighlighter* highlighter;
+	std::shared_ptr<SqlDocument> m_document;
 	ConnectionConfig m_config;
 	StopWatch m_stopwatch;
 
 	QueryParamListController *m_queryParamListController = nullptr;
 
-	bool m_new = true;
-	QString m_fileName; ///< use setFileName function to set
-	bool m_queryTextChanged = false;
 
 	std::shared_ptr<PgDatabaseCatalog> m_catalog;
 	ASyncDBConnection m_dbConnection;
@@ -90,11 +85,6 @@ private:
 	std::unique_ptr<QueryExplainModel> explainModel;
 	ResultTabContainer resultList;
 
-	void setFileName(const QString &filename);
-	bool continueWithoutSavingWarning();
-	bool saveSqlTo(const QString &filename);
-	QString promptUserForSaveSqlFilename();
-
 	void addLog(QString s);
 
 	QString getCommand() const;
@@ -102,15 +92,12 @@ private:
 
 	void clearResult();
 	void markError(const Pgsql::ErrorDetails &details);
-    void updateTitle();
-    void setQueryTextChanged(bool queryTextChanged);
 
 private slots:
 
 	void explain_ready(ExplainRoot::SPtr explain);
     void query_ready(std::shared_ptr<Pgsql::Result>, qint64 elapsedms);
 
-	void queryTextChanged();
     void connectionStateChanged();
 	void receiveNotice(Pgsql::ErrorDetails notice);
 

pglab/querytool/SqlDocument.cpp

@@ -0,0 +1,143 @@
+#include "SqlDocument.h"
+#include "util/SqlSyntaxHighlighter.h"
+#include <QFile>
+#include <QFileDialog>
+#include <QFileInfo>
+#include <QStandardPaths>
+#include <QStringConverter>
+#include <QPlainTextDocumentLayout>
+#include <QTextDocument>
+#include <QTextStream>
+
+SqlDocument::SqlDocument(QObject *parent)
+	: QObject(parent)
+	, m_document(new QTextDocument(this))
+	, m_highlighter(new SqlSyntaxHighlighter(m_document))
+{
+	// QPlainTextEdit only accepts documents that use a QPlainTextDocumentLayout
+	m_document->setDocumentLayout(new QPlainTextDocumentLayout(m_document));
+	connect(m_document, &QTextDocument::modificationChanged, this, &SqlDocument::modifiedChanged);
+	setFileName(tr("new"));
+}
+
+SqlDocument::~SqlDocument() = default;
+
+bool SqlDocument::isModified() const
+{
+	return m_document->isModified();
+}
+
+void SqlDocument::setModified(bool modified)
+{
+	m_document->setModified(modified);
+}
+
+void SqlDocument::clear()
+{
+	m_document->clear();
+	setFileName(tr("new"));
+	m_new = true;
+	setModified(false);
+}
+
+bool SqlDocument::load(const QString &filename)
+{
+	bool result = false;
+	QFile file(filename);
+	if (file.open(QIODevice::ReadOnly)) {
+		QByteArray ba = file.readAll();
+		auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
+		QString text = toUtf16(ba);
+		if (toUtf16.hasError()) {
+			file.reset();
+			QTextStream stream(&file);
+			text = stream.readAll();
+		}
+
+		m_document->setPlainText(text);
+		setModified(false);
+		setFileName(filename);
+		m_new = false;
+		result = true;
+	}
+	return result;
+}
+
+bool SqlDocument::save(QWidget *parent)
+{
+	bool result;
+	if (m_fileName.isEmpty() || m_new) {
+		result = saveAs(parent);
+	}
+	else {
+		result = saveSqlTo(m_fileName);
+	}
+	return result;
+}
+
+bool SqlDocument::saveAs(QWidget *parent)
+{
+	bool result = false;
+	QString filename = promptUserForSaveSqlFilename(parent);
+	if (!filename.isEmpty()) {
+		result = saveSqlTo(filename);
+		if (result) {
+			setFileName(filename);
+			m_new = false;
+		}
+	}
+	return result;
+}
+
+bool SqlDocument::saveCopyAs(QWidget *parent)
+{
+	bool result = false;
+	QString filename = promptUserForSaveSqlFilename(parent);
+	if (!filename.isEmpty()) {
+		result = saveSqlTo(filename);
+	}
+	return result;
+}
+
+void SqlDocument::addEditor(QWidget *editor)
+{
+	if (!m_editors.contains(editor))
+		m_editors.append(editor);
+}
+
+void SqlDocument::removeEditor(QWidget *editor)
+{
+	m_editors.removeAll(editor);
+}
+
+void SqlDocument::setFileName(const QString &filename)
+{
+	m_fileName = filename;
+	emit fileNameChanged();
+}
+
+bool SqlDocument::saveSqlTo(const QString &filename)
+{
+	bool result = false;
+
+	QFile file(filename);
+	if (file.open(QIODevice::WriteOnly)) {
+		QTextStream stream(&file);
+		stream.setEncoding(QStringConverter::Utf8);
+		QString text = m_document->toPlainText();
+		stream << text;
+
+		stream.flush();
+		if (stream.status() == QTextStream::Ok) {
+			setModified(false);
+			result = true;
+		}
+	}
+	return result;
+}
+
+QString SqlDocument::promptUserForSaveSqlFilename(QWidget *parent)
+{
+	QString home_dir = QStandardPaths::locate(QStandardPaths::HomeLocation, "", QStandardPaths::LocateDirectory);
+	return QFileDialog::getSaveFileName(parent, tr("Save query"), home_dir, tr("SQL file (*.sql)"));
+}

pglab/querytool/SqlDocument.h

@@ -0,0 +1,60 @@
+#ifndef SQLDOCUMENT_H
+#define SQLDOCUMENT_H
+
+#include <QList>
+#include <QObject>
+#include <QString>
+
+class QTextDocument;
+class QWidget;
+class SqlSyntaxHighlighter;
+
+/** Owns the text of a SQL script together with its file state.
+ * Several query tools (editors) can show the same document, they all
+ * use the same QTextDocument.
+ */
+class SqlDocument : public QObject {
+	Q_OBJECT
+public:
+	explicit SqlDocument(QObject *parent = nullptr);
+	~SqlDocument() override;
+
+	QTextDocument *textDocument() const { return m_document; }
+	SqlSyntaxHighlighter *highlighter() const { return m_highlighter; }
+
+	QString fileName() const { return m_fileName; }
+	bool isNew() const { return m_new; }
+	bool isModified() const;
+	void setModified(bool modified);
+
+	/// Empties the document and makes it a new unnamed document.
+	void clear();
+	bool load(const QString &filename);
+	/// Save the document under its current name, a file save dialog will be shown if this is a new document
+	bool save(QWidget *parent);
+	/// Saves the document under a new name and continue editing the document under this new name.
+	bool saveAs(QWidget *parent);
+	/// Save the document under a new name but continue editing the document under its old name.
+	bool saveCopyAs(QWidget *parent);
+
+	void addEditor(QWidget *editor);
+	void removeEditor(QWidget *editor);
+	const QList<QWidget*> &editors() const { return m_editors; }
+
+signals:
+	void modifiedChanged(bool modified);
+	void fileNameChanged();
+
+private:
+	QTextDocument *m_document;
+	SqlSyntaxHighlighter *m_highlighter;
+	QString m_fileName;
+	bool m_new = true;
+	QList<QWidget*> m_editors;
+
+	void setFileName(const QString &filename);
+	bool saveSqlTo(const QString &filename);
+	QString promptUserForSaveSqlFilename(QWidget *parent);
+};
+
+#endif // SQLDOCUMENT_H

pglab/querytool/SqlDocumentRegistry.cpp

@@ -0,0 +1,27 @@
+#include "SqlDocumentRegistry.h"
+#include "SqlDocument.h"
+
+void SqlDocumentRegistry::add(const std::shared_ptr<SqlDocument> &document)
+{
+	m_documents.push_back(document);
+}
+
+QList<std::shared_ptr<SqlDocument>> SqlDocumentRegistry::documents() const
+{
+	QList<std::shared_ptr<SqlDocument>> result;
+	for (const auto &weak : m_documents) {
+		if (auto doc = weak.lock())
+			result.append(doc);
+	}
+	return result;
+}
+
+QList<std::shared_ptr<SqlDocument>> SqlDocumentRegistry::modifiedDocuments() const
+{
+	QList<std::shared_ptr<SqlDocument>> result;
+	for (auto &doc : documents()) {
+		if (doc->isModified())
+			result.append(doc);
+	}
+	return result;
+}

pglab/querytool/SqlDocumentRegistry.h

@@ -0,0 +1,27 @@
+#ifndef SQLDOCUMENTREGISTRY_H
+#define SQLDOCUMENTREGISTRY_H
+
+#include <QList>
+#include <memory>
+#include <vector>
+
+class SqlDocument;
+
+/** Keeps track of all SQL documents that are still in use, without
+ * extending their lifetime. A document lives as long as at least one
+ * query tool holds a shared pointer to it.
+ */
+class SqlDocumentRegistry {
+public:
+	void add(const std::shared_ptr<SqlDocument> &document);
+
+	/// All documents that are still alive.
+	QList<std::shared_ptr<SqlDocument>> documents() const;
+	/// All documents that are alive and have unsaved changes.
+	QList<std::shared_ptr<SqlDocument>> modifiedDocuments() const;
+
+private:
+	std::vector<std::weak_ptr<SqlDocument>> m_documents;
+};
+
+#endif // SQLDOCUMENTREGISTRY_H

pglab/querytool/UnsavedDocumentsDialog.cpp

@@ -0,0 +1,112 @@
+#include "UnsavedDocumentsDialog.h"
+#include <QDialogButtonBox>
+#include <QListWidget>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QLabel>
+#include <algorithm>
+
+UnsavedDocumentsDialog::UnsavedDocumentsDialog(const QList<std::shared_ptr<SqlDocument>> &docs, QWidget *parent)
+	: QDialog(parent)
+	, m_docs(docs)
+	, m_list(new QListWidget(this))
+{
+	setWindowTitle(tr("Unsaved changes"));
+
+	auto layout = new QVBoxLayout(this);
+	layout->addWidget(new QLabel(tr("The following documents have unsaved changes. Select the documents to save or discard:"), this));
+
+	for (const auto &doc : m_docs) {
+		QStringList windows;
+		for (const QWidget *editor : doc->editors()) {
+			QString title = editor->window()->windowTitle();
+			if (!windows.contains(title))
+				windows.append(title);
+		}
+
+		auto item = new QListWidgetItem(QString("%1 (%2)").arg(doc->fileName(), windows.join(", ")), m_list);
+		item->setToolTip(doc->fileName());
+		item->setFlags(item->flags() | Qt::ItemIsUserCheckable);
+		item->setCheckState(Qt::Checked);
+	}
+	layout->addWidget(m_list);
+
+	auto buttons = new QDialogButtonBox(this);
+	auto save_button = buttons->addButton(tr("Save selected"), QDialogButtonBox::AcceptRole);
+	auto discard_button = buttons->addButton(tr("Discard selected"), QDialogButtonBox::DestructiveRole);
+	buttons->addButton(QDialogButtonBox::Cancel);
+	layout->addWidget(buttons);
+
+	connect(save_button, &QPushButton::clicked, this, [this]() {
+		m_choice = Choice::Save;
+		accept();
+	});
+	connect(discard_button, &QPushButton::clicked, this, [this]() {
+		m_choice = Choice::Discard;
+		accept();
+	});
+	connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::reject);
+}
+
+QList<std::shared_ptr<SqlDocument>> UnsavedDocumentsDialog::checkedDocuments() const
+{
+	QList<std::shared_ptr<SqlDocument>> result;
+	for (int i = 0; i < m_docs.size(); ++i) {
+		if (m_list->item(i)->checkState() == Qt::Checked)
+			result.append(m_docs[i]);
+	}
+	return result;
+}
+
+QList<std::shared_ptr<SqlDocument>> UnsavedDocumentsDialog::uncheckedDocuments() const
+{
+	QList<std::shared_ptr<SqlDocument>> result;
+	for (int i = 0; i < m_docs.size(); ++i) {
+		if (m_list->item(i)->checkState() != Qt::Checked)
+			result.append(m_docs[i]);
+	}
+	return result;
+}
+
+QList<std::shared_ptr<SqlDocument>> documentsClosedWith(const QList<std::shared_ptr<SqlDocument>> &docs,
+	const std::function<bool(const QWidget*)> &isClosing)
+{
+	QList<std::shared_ptr<SqlDocument>> result;
+	for (const auto &doc : docs) {
+		const auto &editors = doc->editors();
+		if (!doc->isModified() || editors.isEmpty())
+			continue;
+
+		bool all_closing = std::all_of(editors.begin(), editors.end(),
+			[&isClosing](const QWidget *editor) { return isClosing(editor); });
+		if (all_closing)
+			result.append(doc);
+	}
+	return result;
+}
+
+bool confirmClose(QWidget *parent, const QList<std::shared_ptr<SqlDocument>> &docs)
+{
+	auto remaining = docs;
+	while (!remaining.isEmpty()) {
+		UnsavedDocumentsDialog dlg(remaining, parent);
+		if (dlg.exec() != QDialog::Accepted || dlg.choice() == UnsavedDocumentsDialog::Choice::Cancel)
+			return false;
+
+		bool save = dlg.choice() == UnsavedDocumentsDialog::Choice::Save;
+		for (const auto &doc : dlg.checkedDocuments()) {
+			if (save) {
+				if (!doc->save(parent))
+					return false;
+			}
+			else {
+				doc->setModified(false);
+			}
+		}
+
+		// Show the dialog again for the documents the user did not select.
+		remaining = dlg.uncheckedDocuments();
+	}
+
+	return true;
+}

pglab/querytool/UnsavedDocumentsDialog.h

@@ -0,0 +1,48 @@
+#ifndef UNSAVEDDOCUMENTSDIALOG_H
+#define UNSAVEDDOCUMENTSDIALOG_H
+
+#include "SqlDocument.h"
+#include <QDialog>
+#include <QList>
+#include <functional>
+#include <memory>
+
+class QListWidget;
+
+/** Lists modified documents with a checkbox per document. The user picks
+ * whether the checked documents should be saved or discarded.
+ */
+class UnsavedDocumentsDialog : public QDialog {
+	Q_OBJECT
+public:
+	enum class Choice {
+		Cancel,
+		Save,
+		Discard
+	};
+
+	UnsavedDocumentsDialog(const QList<std::shared_ptr<SqlDocument>> &docs, QWidget *parent = nullptr);
+
+	Choice choice() const { return m_choice; }
+	QList<std::shared_ptr<SqlDocument>> checkedDocuments() const;
+	QList<std::shared_ptr<SqlDocument>> uncheckedDocuments() const;
+
+private:
+	QList<std::shared_ptr<SqlDocument>> m_docs;
+	QListWidget *m_list;
+	Choice m_choice = Choice::Cancel;
+};
+
+/** Selects the documents that are closed when every editor for which
+ * isClosing returns true is closed. Only modified documents are returned.
+ */
+QList<std::shared_ptr<SqlDocument>> documentsClosedWith(const QList<std::shared_ptr<SqlDocument>> &docs,
+	const std::function<bool(const QWidget*)> &isClosing);
+
+/** Asks the user what to do with the modified documents. Returns true when
+ * the close may continue, i.e. nothing was cancelled, no save failed and
+ * every listed document was checked.
+ */
+bool confirmClose(QWidget *parent, const QList<std::shared_ptr<SqlDocument>> &docs);
+
+#endif // UNSAVEDDOCUMENTSDIALOG_H

releasenotes/notes/unsaved-docs-dialog-shared-docs-5c1e9a7d2b4f6e80.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    Closing a window or quitting the application now shows a single "Unsaved changes" dialog listing all modified SQL documents. Select the documents to save or discard; after the action has completed the dialog is shown again for the remaining documents, until all are handled or you cancel.
+  - |
+    A SQL document can be opened in another window with its own connection via the new "Open in other window / Duplicate in window..." action in the File menu. Both windows share the same text, and the document is only prompted for when its last editor closes.
+fixes:
+  - |
+    Quitting the application from the connection manager no longer discards unsaved SQL changes silently.