WebPreview is now delayed by 2 seconds.

[quassel.git] / src / qtui / chatscene.cpp

diff --git a/src/qtui/chatscene.cpp b/src/qtui/chatscene.cpp
index 55e3c4e..d778df2 100644 (file)
--- a/src/qtui/chatscene.cpp
+++ b/src/qtui/chatscene.cpp
@@ -38,6 +38,11 @@
 
 const qreal minContentsWidth = 200;
 
+class ClearWebPreviewEvent : public QEvent {
+public:
+  inline ClearWebPreviewEvent() : QEvent(QEvent::User) {}
+};
+
 ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal width, QObject *parent)
   : QGraphicsScene(0, 0, width, 0, parent),
     _idString(idString),
@@ -85,6 +90,9 @@ ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal w
 
   if(model->rowCount() > 0)
     rowsInserted(QModelIndex(), 0, model->rowCount() - 1);
+
+  webPreview.delayTimer.setSingleShot(true);
+  connect(&webPreview.delayTimer, SIGNAL(timeout()), this, SLOT(showWebPreview()));
 }
 
 ChatScene::~ChatScene() {
@@ -92,9 +100,6 @@ ChatScene::~ChatScene() {
 
 void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   Q_UNUSED(index);
-
-  clearWebPreview();
-
 //   QModelIndex sidx = model()->index(start, 0);
 //   QModelIndex eidx = model()->index(end, 0);
 //   qDebug() << "rowsInserted" << start << end << "-" << sidx.data(MessageModel::MsgIdRole).value<MsgId>() << eidx.data(MessageModel::MsgIdRole).value<MsgId>();
@@ -122,20 +127,28 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   QPointF contentsPos(secondColumnHandle()->sceneRight(), 0);
   QPointF senderPos(firstColumnHandle()->sceneRight(), 0);
 
-  for(int i = start; i <= end; i++) {
-    ChatLine *line = new ChatLine(i, model(),
-                                 width,
-                                 timestampWidth, senderWidth, contentsWidth,
-                                 senderPos, contentsPos);
-    if(atTop) {
+  if(atTop) {
+    for(int i = end; i >= start; i--) {
+      ChatLine *line = new ChatLine(i, model(),
+                                   width,
+                                   timestampWidth, senderWidth, contentsWidth,
+                                   senderPos, contentsPos);
       h += line->height();
       line->setPos(0, y-h);
-    } else {
+      _lines.insert(start, line);
+      addItem(line);
+    }
+  } else {
+    for(int i = start; i <= end; i++) {
+      ChatLine *line = new ChatLine(i, model(),
+                                   width,
+                                   timestampWidth, senderWidth, contentsWidth,
+                                   senderPos, contentsPos);
       line->setPos(0, y+h);
       h += line->height();
+      _lines.insert(i, line);
+      addItem(line);
     }
-    _lines.insert(i, line);
-    addItem(line);
   }
 
   // update existing items
@@ -166,7 +179,7 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
       moveEnd = end;
     } else {
       // move bottom part
-      moveStart = start;
+      moveStart = end + 1;
     }
     ChatLine *line = 0;
     for(int i = moveStart; i <= moveEnd; i++) {
@@ -176,6 +189,12 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   }
 
   if(!atBottom) {
+    if(start < _firstLineRow) {
+      int prevFirstLineRow = _firstLineRow + (end - start + 1);
+      for(int i = end + 1; i < prevFirstLineRow; i++) {
+       _lines.at(i)->show();
+      }
+    }
     // force new search for first proper line
     _firstLineRow = -1;
   }
@@ -189,8 +208,6 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
 void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) {
   Q_UNUSED(parent);
 
-  clearWebPreview();
-
   qreal h = 0; // total height of removed items;
 
   bool atTop = (start == 0);
@@ -509,13 +526,21 @@ void ChatScene::updateSceneRect() {
   }
 
   // we hide day change messages at the top by making the scene rect smaller
+  // and by calling QGraphicsItem::hide() on all leading day change messages
+  // the first one is needed to ensure proper scrollbar ranges
+  // the second for cases where the viewport is larger then the set scenerect
+  //  (in this case the items are shown anyways)
   if(_firstLineRow == -1) {
     int numRows = model()->rowCount();
+    _firstLineRow = 0;
     QModelIndex firstLineIdx;
-    do {
-      _firstLineRow++;
+    while(_firstLineRow < numRows) {
       firstLineIdx = model()->index(_firstLineRow, 0);
-    } while((Message::Type)(model()->data(firstLineIdx, MessageModel::TypeRole).toInt()) == Message::DayChange && _firstLineRow < numRows);
+      if((Message::Type)(model()->data(firstLineIdx, MessageModel::TypeRole).toInt()) != Message::DayChange)
+       break;
+      _lines.at(_firstLineRow)->hide();
+      _firstLineRow++;
+    }
   }
 
   // the following call should be safe. If it crashes something went wrong during insert/remove
@@ -534,6 +559,13 @@ void ChatScene::updateSceneRect(const QRectF &rect) {
   setSceneRect(rect);
 }
 
+void ChatScene::customEvent(QEvent *event) {
+  if(event->type() != QEvent::User)
+    return;
+
+  event->accept();
+  clearWebPreviewEvent();
+}
 
 void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const QRectF &urlRect) {
 #ifndef HAVE_WEBKIT
@@ -552,7 +584,7 @@ void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const Q
       delete webPreview.previewItem;
     }
     webPreview.previewItem = new WebPreviewItem(url);
-    addItem(webPreview.previewItem);
+    webPreview.delayTimer.start(2000);
   }
   if(webPreview.urlRect != urlRect) {
     webPreview.urlRect = urlRect;
@@ -574,14 +606,32 @@ void ChatScene::clearWebPreview(ChatItem *parentItem) {
   Q_UNUSED(parentItem)
 #else
   if(parentItem == 0 || webPreview.parentItem == parentItem) {
-    if(webPreview.previewItem) {
-      removeItem(webPreview.previewItem);
-      delete webPreview.previewItem;
-      webPreview.previewItem = 0;
-    }
-    webPreview.parentItem = 0;
-    webPreview.url = QString();
-    webPreview.urlRect = QRectF();
+    // posting an event ensures that the item will not be removed as
+    // the result of another event. this could result in bad segfaults
+    QCoreApplication::postEvent(this, new ClearWebPreviewEvent());
   }
 #endif
 }
+
+void ChatScene::showWebPreview() {
+#ifdef HAVE_WEBKIT
+  if(webPreview.previewItem)
+    addItem(webPreview.previewItem);
+#endif
+}
+
+void ChatScene::clearWebPreviewEvent() {
+#ifdef HAVE_WEBKIT
+  if(webPreview.previewItem) {
+    if(!webPreview.delayTimer.isActive())
+      removeItem(webPreview.previewItem);
+    else
+      webPreview.delayTimer.stop();
+    delete webPreview.previewItem;
+    webPreview.previewItem = 0;
+  }
+  webPreview.parentItem = 0;
+  webPreview.url = QString();
+  webPreview.urlRect = QRectF();
+#endif
+}