From 121fdba3666b43549a2f02dc4bfef1605707a1d5 Mon Sep 17 00:00:00 2001
From: Pavel Sanda <sanda@lyx.org>
Date: Sun, 19 Dec 2010 22:27:21 +0000
Subject: [PATCH] Attempt to workaround movement and editation slowness. If it
 turns out to be too annoying for other we can disable it again. Hopefully fix
 #7138.

http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg164385.html



git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@36951 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/frontends/qt4/TocWidget.cpp | 27 ++++++++++++++++++++++++---
 src/frontends/qt4/TocWidget.h   |  6 +++++-
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/src/frontends/qt4/TocWidget.cpp b/src/frontends/qt4/TocWidget.cpp
index 84db8bd88e..f67d39119c 100644
--- a/src/frontends/qt4/TocWidget.cpp
+++ b/src/frontends/qt4/TocWidget.cpp
@@ -39,13 +39,16 @@
 
 #include <vector>
 
+#define DELAY_UPDATE_VIEW
+
 using namespace std;
 
 namespace lyx {
 namespace frontend {
 
 TocWidget::TocWidget(GuiView & gui_view, QWidget * parent)
-	: QWidget(parent), depth_(0), persistent_(false), gui_view_(gui_view)
+	: QWidget(parent), depth_(0), persistent_(false), gui_view_(gui_view), update_delay_(0)
+
 {
 	setupUi(this);
 
@@ -249,7 +252,7 @@ void TocWidget::on_updateTB_clicked()
 void TocWidget::on_sortCB_stateChanged(int state)
 {
 	gui_view_.tocModels().sort(current_type_, state == Qt::Checked);
-	updateView();
+	updateViewForce();
 }
 
 
@@ -317,7 +320,7 @@ void TocWidget::on_typeCO_currentIndexChanged(int index)
 	if (index == -1)
 		return;
 	current_type_ = typeCO->itemData(index).toString();
-	updateView();
+	updateViewForce();
 	if (typeCO->hasFocus())
 		gui_view_.setFocus();
 }
@@ -389,6 +392,21 @@ void TocWidget::enableControls(bool enable)
 
 void TocWidget::updateView()
 {
+// Enable if you dont want the delaying business, cf #7138.
+#ifndef DELAY_UPDATE_VIEW
+	updateViewForce();
+	return;
+#endif
+	// already scheduled?
+	if (update_delay_ == -1)
+		return;
+	QTimer::singleShot(update_delay_, this, SLOT(updateViewForce()));
+	update_delay_ = -1;
+}
+
+void TocWidget::updateViewForce()
+{
+	update_delay_ = 2000;
 	if (!gui_view_.documentBufferView()) {
 		tocTV->setModel(0);
 		depthSL->setMaximum(0);
@@ -506,6 +524,9 @@ void TocWidget::init(QString const & str)
 	typeCO->blockSignals(true);
 	typeCO->setCurrentIndex(new_index);
 	typeCO->blockSignals(false);
+
+	// no delay when the whole outliner is reseted.
+	update_delay_ = 0;
 }
 
 } // namespace frontend
diff --git a/src/frontends/qt4/TocWidget.h b/src/frontends/qt4/TocWidget.h
index 6dd9fbf76a..608920a42a 100644
--- a/src/frontends/qt4/TocWidget.h
+++ b/src/frontends/qt4/TocWidget.h
@@ -44,8 +44,10 @@ public:
 		const;
 
 public Q_SLOTS:
-	/// Update the display of the dialog whilst it is still visible.
+	/// Schedule new update of the display unless already scheduled.
 	void updateView();
+	/// Update the display of the dialog whilst it is still visible.
+	void updateViewForce();
 
 protected Q_SLOTS:
 	///
@@ -99,6 +101,8 @@ private:
 	bool persistent_;
 	///
 	GuiView & gui_view_;
+	// next delay for outliner update in ms. -1 when already scheduled.
+	int update_delay_;
 };
 
 } // namespace frontend
-- 
2.39.2