restore cursor position in preamble.

* ControlDocument::id(): new method returning the id of the current buffer.

* PreambleModule: new class for the preamble module. Handle everything preamble related, including memorizing the cursor position for each Buffer.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18307 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/controllers/ControlDocument.cpp

@@ -79,6 +79,12 @@ BufferParams & ControlDocument::params() const
 }
 
 
+int ControlDocument::id() const
+{
+	return (int) &kernel().buffer();
+}
+
+
 TextClass const & ControlDocument::textClass() const
 {
 	return textclasslist[bp_->textclass];

src/frontends/controllers/ControlDocument.h

@@ -50,6 +50,8 @@ public:
 	///
 	BufferParams & params() const;
 	///
+	int id() const;
+	///
 	void setLanguage() const;
 	///
 	void saveAsDefault() const;

src/frontends/qt4/QDocument.cpp

@@ -11,21 +11,21 @@
 #include <config.h>
 
 #include "QDocument.h"
-#include "Qt2BC.h"
-#include "qt_helpers.h"
-#include "QBranches.h"
-
-#include <QCloseEvent>
 
+#include "CheckedLineEdit.h"
 #include "FloatPlacement.h"
 #include "LengthCombo.h"
-#include "Validator.h"
 #include "PanelStack.h"
 #include "Qt2BC.h"
-#include "CheckedLineEdit.h"
+#include "qt_helpers.h"
+#include "Validator.h"
 
-// For latexHighlighter use in the preamble.
-#include "QViewSource.h"
+// For the Branches module
+#include "QBranches.h"
+
+#include "QViewSource.h" // For latexHighlighter use in the preamble.
+
+#include "controllers/ControlDocument.h"
 
 #include "BufferParams.h"
 #include "Encoding.h"
@@ -41,8 +41,10 @@
 
 #include "support/lstrings.h"
 
-#include "controllers/ControlDocument.h"
+#include <QCloseEvent>
+#include <QTextCursor>
 
+#include <map>
 
 using lyx::support::token;
 using lyx::support::bformat;
@@ -50,6 +52,7 @@ using lyx::support::findToken;
 using lyx::support::getVectorFromString;
 
 using std::distance;
+using std::make_pair;
 using std::vector;
 using std::string;
 
@@ -93,6 +96,67 @@ char const * tex_fonts_monospaced_gui[] = { N_("Default"), N_("Computer Modern T
 namespace lyx {
 namespace frontend {
 
+/////////////////////////////////////////////////////////////////////
+//
+// PreambleModule
+//
+/////////////////////////////////////////////////////////////////////
+
+PreambleModule::PreambleModule(): current_id_(0)
+{
+	// This is not a memory leak. The object will be destroyed
+	// with this.
+	(void) new LaTeXHighlighter(preambleTE->document());
+	setFocusProxy(preambleTE);
+}
+
+
+void PreambleModule::update(BufferParams const & params, int id)
+{
+	QString preamble = toqstr(params.preamble);
+	// Nothing to do if the params and preamble are unchanged.
+	if (id == current_id_ 
+		&& preamble == preambleTE->document()->toPlainText())
+		return;
+
+	QTextCursor cur = preambleTE->textCursor();
+	// Save the coords before switching to the new one.
+	preamble_coords_[current_id_] = 
+		make_pair(cur.position(), preambleTE->verticalScrollBar()->value());
+
+	// Save the params address for further use.
+	current_id_ = id;
+	preambleTE->document()->setPlainText(preamble);
+	Coords::const_iterator it = preamble_coords_.find(current_id_);
+	if (it == preamble_coords_.end())
+		// First time we open this one.
+		preamble_coords_[current_id_] = make_pair(0,0);
+	else {
+		// Restore saved coords.
+		QTextCursor cur = preambleTE->textCursor();
+		cur.setPosition(it->second.first);
+		preambleTE->setTextCursor(cur);
+		preambleTE->verticalScrollBar()->setValue(it->second.second);
+	}
+}
+
+
+void PreambleModule::apply(BufferParams & params)
+{
+	params.preamble = fromqstr(preambleTE->document()->toPlainText());
+}
+
+
+void PreambleModule::closeEvent(QCloseEvent * e)
+{
+	// Save the coords before closing.
+	QTextCursor cur = preambleTE->textCursor();
+	preamble_coords_[current_id_] = 
+		make_pair(cur.position(), preambleTE->verticalScrollBar()->value());
+	e->accept();
+}
+
+
 /////////////////////////////////////////////////////////////////////
 //
 // DocumentDialog
@@ -481,13 +545,9 @@ QDocumentDialog::QDocumentDialog(QDocument * form)
 		this, SLOT(change_adaptor()));
 
 	// preamble
-	preambleModule = new UiWidget<Ui::PreambleUi>;
-	connect(preambleModule->preambleTE, SIGNAL(textChanged()),
+	preambleModule = new PreambleModule;
+	connect(preambleModule, SIGNAL(changed()),
 		this, SLOT(change_adaptor()));
-	// This is not a memory leak. The object will be destroyed
-	// with preambleModule.
-	(void) new LaTeXHighlighter(preambleModule->preambleTE->document());
-
 
 	// bullets
 	bulletsModule = new BulletsModule;
@@ -770,8 +830,7 @@ void QDocumentDialog::updateNumbering()
 void QDocumentDialog::apply(BufferParams & params)
 {
 	// preamble
-	params.preamble =
-		fromqstr(preambleModule->preambleTE->document()->toPlainText());
+	preambleModule->apply(params);
 
 	// biblio
 	params.setCiteEngine(biblio::ENGINE_BASIC);
@@ -1050,9 +1109,7 @@ void QDocumentDialog::updateParams(BufferParams const & params)
 	}
 
 	// preamble
-	QString preamble = toqstr(params.preamble);
-	if (preamble != preambleModule->preambleTE->document()->toPlainText())
-		preambleModule->preambleTE->document()->setPlainText(preamble);
+	preambleModule->update(params, form_->controller().id());
 
 	// biblio
 	biblioModule->citeDefaultRB->setChecked(
@@ -1291,7 +1348,6 @@ void QDocumentDialog::updateParams(BufferParams const & params)
 }
 
 
-
 /////////////////////////////////////////////////////////////////////
 //
 // Document

src/frontends/qt4/QDocument.h

@@ -25,10 +25,13 @@
 #include "ui/BiblioUi.h"
 #include "ui/NumberingUi.h"
 #include "ui/MarginsUi.h"
+
+// For the Preamble module
 #include "ui/PreambleUi.h"
 
 #include <QCloseEvent>
 #include <QDialog>
+
 #include <vector>
 #include <string>
 
@@ -49,6 +52,7 @@ namespace frontend {
 
 class QBranches;
 class QDocument;
+class PreambleModule;
 
 class QDocumentDialog : public QDialog, public Ui::QDocumentUi {
 	Q_OBJECT
@@ -99,7 +103,7 @@ private:
 	UiWidget<Ui::BiblioUi> *biblioModule;
 	UiWidget<Ui::MathsUi> *mathsModule;
 	UiWidget<Ui::LaTeXUi> *latexModule;
-	UiWidget<Ui::PreambleUi> *preambleModule;
+	PreambleModule *preambleModule;
 
 	QBranches *branchesModule;
 
@@ -113,7 +117,6 @@ private:
 };
 
 
-
 class ControlDocument;
 
 class QDocument
@@ -140,6 +143,31 @@ private:
 	void useClassDefaults();
 };
 
+
+class PreambleModule : public UiWidget<Ui::PreambleUi>
+{
+	Q_OBJECT
+public:
+	PreambleModule();
+	void update(BufferParams const & params, int id);
+	void apply(BufferParams & params);
+
+Q_SIGNALS:
+	/// signal that something's changed in the Widget.
+	void changed();
+
+protected:
+	void closeEvent(QCloseEvent *);
+	void on_preambleTE_textChanged() { changed(); }
+
+private:
+	typedef std::map<int, std::pair<int,int> > Coords;
+	Coords preamble_coords_;
+	int current_id_;
+};
+
+
+
 } // namespace frontend
 } // namespace lyx