From e40be8a9658095b5d7e87afdf4a95762885e7aab Mon Sep 17 00:00:00 2001
From: Lukáš Lalinský <lalinsky@gmail.com>
Date: Wed, 31 Dec 2008 11:08:29 +0100
Subject: Update line layouts in a singleshot timer

---
 src/diagramdocument.cpp | 70 +++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 56 insertions(+), 14 deletions(-)

(limited to 'src/diagramdocument.cpp')

diff --git a/src/diagramdocument.cpp b/src/diagramdocument.cpp
index 28a3eda..bab359b 100644
--- a/src/diagramdocument.cpp
+++ b/src/diagramdocument.cpp
@@ -24,10 +24,12 @@
 #include "items/database/column.h"
 #include "commands.h"
 #include <QGraphicsItem>
+#include <QTimer>
 #include <QDebug>
 #include <QFile>
 #include <QTextStream>
 #include <QStyle>
+#include <QSet>
 
 using namespace std;
 
@@ -47,6 +49,10 @@ public:
 	bool printing;
 	Notation notation;
 
+	QTimer *updateTimer;
+	QList<Line *> linesToAdd;
+	QSet<DiagramObject *> objectsToUpdate;
+	QSet<Line *> linesToUpdate;
 	QMap<QString, int> counters;
 };
 
@@ -54,6 +60,10 @@ DiagramDocument::DiagramDocument(QObject *parent)
 	: QGraphicsScene(parent), d(new DiagramDocumentPrivate), m_mode(DiagramDocument::Select), m_line(NULL)
 {
 	m_undoStack = new QUndoStack(this);
+	d->updateTimer = new QTimer();
+	d->updateTimer->setSingleShot(true);
+	d->updateTimer->setInterval(10);
+	connect(d->updateTimer, SIGNAL(timeout()), this, SLOT(_updateLines()));
 }
 
 DiagramDocument::Notation
@@ -139,20 +149,50 @@ DiagramDocument::setMode(Mode mode)
 }
 
 void
-DiagramDocument::updatePositions(DiagramObject *object)
+DiagramDocument::updatePositions(DiagramObject *object, bool force)
 {
-    Connector *connector;
-	foreach (Line *connection, findConnections(object)) {
-        connector = connection->connector(0);
-        if (connector->isConnected())
-            connector->hub()->update();
-        connector = connection->connector(1);
-        if (connector->isConnected())
-            connector->hub()->update();
-		connection->updatePositions();
-    }
+	d->objectsToUpdate.insert(object);
+	if (force)
+		d->updateTimer->start(0);
+	else
+		d->updateTimer->start();
 }
 
+void
+DiagramDocument::updateLineLayout(Line *line)
+{
+	d->linesToUpdate.insert(line);
+}
+
+void
+DiagramDocument::_updateLines()
+{
+	QSet<DiagramObject *> objectsToUpdate(d->objectsToUpdate);
+	d->objectsToUpdate.clear();
+	updateLines(objectsToUpdate);
+}
+
+void
+DiagramDocument::updateLines(QSet<DiagramObject *> objectsToUpdate)
+{
+	QSet<Hub *> hubsToUpdate;
+	foreach (DiagramObject *obj, objectsToUpdate) {
+		hubsToUpdate.insert(obj->hub());
+		foreach (Connector *conn, obj->hub()->connectors()) {
+			hubsToUpdate.insert(conn->otherEnd()->hub());
+		}
+	}
+	foreach (Hub *hub, hubsToUpdate) {
+		hub->update();
+	}
+	foreach (Line *line, d->linesToUpdate) {
+		line->updateLayout();
+		line->update(); // XXX why is this necessary?
+	}
+	d->linesToUpdate.clear();
+}
+
+
 template <class T> QList<T *>
 DiagramDocument::itemsByType()
 {
@@ -195,7 +235,10 @@ DiagramDocument::itemMoved(DiagramItem *item)
 void
 DiagramDocument::itemHasMoved(DiagramItem *item)
 {
-	updatePositions(static_cast<DatabaseTable*>(item));
+	DiagramObject *obj = static_cast<DiagramObject *>(item);
+	if (obj) {
+		updatePositions(obj);
+	}
 }
 
 void
@@ -254,8 +297,7 @@ DiagramDocument::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 			relation->createId();
 			relation->connector(0)->setHub(source->hub());
 			relation->connector(1)->setHub(target->hub());
-            source->hub()->update();
-            target->hub()->update();
+			updateLines(QSet<DiagramObject *>() << source);
 			undoStack()->push(new AddItemCommand(this, relation));
 		}
 		delete m_line;
-- 
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