From 3271ab1dff7df6f6464cb714d675291aae791639 Mon Sep 17 00:00:00 2001
From: Manuel Nickschas <sputnick@quassel-irc.org>
Date: Fri, 7 Nov 2008 11:38:32 +0100
Subject: [PATCH 1/1] ChatView now asks the scene if scrolling is ok on message
 appending

That way, the scene can inhibit autoscroll for example while selecting, or during
a click sequence (nothing is more annoying than a link that scrolls away while you have
the button still pressed...). The former is already implemented, the latter follows next
as soon as I get a decent click handling going.
---
 src/qtui/chatscene.cpp | 9 +++++++++
 src/qtui/chatscene.h   | 2 ++
 src/qtui/chatview.cpp  | 3 +++
 3 files changed, 14 insertions(+)

diff --git a/src/qtui/chatscene.cpp b/src/qtui/chatscene.cpp
index 81996488..358eb12b 100644
--- a/src/qtui/chatscene.cpp
+++ b/src/qtui/chatscene.cpp
@@ -513,6 +513,15 @@ void ChatScene::updateSelection(const QPointF &pos) {
   }
 }
 
+bool ChatScene::isScrollingAllowed() const {
+  if(_isSelecting)
+    return false;
+
+  // TODO: Handle clicks and single-item selections too
+
+  return true;
+}
+
 void ChatScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
   if(_isSelecting && event->buttons() == Qt::LeftButton) {
     updateSelection(event->scenePos());
diff --git a/src/qtui/chatscene.h b/src/qtui/chatscene.h
index a932380b..0c9329ed 100644
--- a/src/qtui/chatscene.h
+++ b/src/qtui/chatscene.h
@@ -72,6 +72,8 @@ public:
   inline CutoffMode senderCutoffMode() const { return _cutoffMode; }
   inline void setSenderCutoffMode(CutoffMode mode) { _cutoffMode = mode; }
 
+  bool isScrollingAllowed() const;
+
   virtual bool event(QEvent *e);
 
  public slots:
diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index d360d9de..536a5111 100644
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -108,6 +108,9 @@ void ChatView::scrollTimerTimeout() {
 
 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
   Q_UNUSED(chatLine)
+  if(!scene()->isScrollingAllowed())
+    return;
+
   QAbstractSlider *vbar = verticalScrollBar();
   Q_ASSERT(vbar);
   if(vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
-- 
2.20.1