client: Default to AsNeeded backlog fetching

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

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index eb80000..f8fb586 100644 (file)
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2005-2018 by the Quassel Project                        *
+ *   Copyright (C) 2005-2020 by the Quassel Project                        *
  *   devel@quassel-irc.org                                                 *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -20,6 +20,8 @@
 
 #include "chatview.h"
 
+#include <algorithm>
+
 #include <QGraphicsTextItem>
 #include <QKeyEvent>
 #include <QMenu>
@@ -33,6 +35,7 @@
 #include "messagefilter.h"
 #include "qtui.h"
 #include "qtuistyle.h"
+#include "util.h"
 
 ChatView::ChatView(BufferId bufferId, QWidget* parent)
     : QGraphicsView(parent)
@@ -97,8 +100,7 @@ bool ChatView::event(QEvent* event)
         case Qt::Key_Down:
         case Qt::Key_PageUp:
         case Qt::Key_PageDown:
-            if (!verticalScrollBar()->isVisible()) {
-                scene()->requestBacklog();
+            if (requestBacklogForScroll()) {
                 return true;
             }
         default:
@@ -142,8 +144,7 @@ bool ChatView::event(QEvent* event)
     if (event->type() == QEvent::Wheel
         || (event->type() == QEvent::TouchBegin && ((QTouchEvent*)event)->device()->type() == QTouchDevice::TouchScreen)
         || event->type() == QEvent::TouchUpdate) {
-        if (!verticalScrollBar()->isVisible()) {
-            scene()->requestBacklog();
+        if (requestBacklogForScroll()) {
             return true;
         }
     }
@@ -291,8 +292,8 @@ QSet<ChatLine*> ChatView::visibleChatLines(Qt::ItemSelectionMode mode) const
 
 QList<ChatLine*> ChatView::visibleChatLinesSorted(Qt::ItemSelectionMode mode) const
 {
-    QList<ChatLine*> result = visibleChatLines(mode).toList();
-    qSort(result.begin(), result.end(), chatLinePtrLessThan);
+    QList<ChatLine*> result = visibleChatLines(mode).values();
+    std::sort(result.begin(), result.end(), chatLinePtrLessThan);
     return result;
 }
 
@@ -406,6 +407,23 @@ void ChatView::setHasCache(ChatLine* line, bool hasCache)
         _linesWithCache.remove(line);
 }
 
+bool ChatView::requestBacklogForScroll()
+{
+    if (!verticalScrollBar()->isVisible()) {
+        // Not able to scroll, fetch backlog
+        //
+        // Future improvement: continue fetching backlog in chunks until the scrollbar is visible,
+        // or the beginning of the buffer has been reached.
+        scene()->requestBacklog();
+        // Backlog has been requested
+        return true;
+    }
+    else {
+        // Scrollbar already visible, no backlog requested
+        return false;
+    }
+}
+
 void ChatView::checkChatLineCaches()
 {
     qreal top = mapToScene(viewport()->rect().topLeft()).y() - 10;  // some grace area to avoid premature cleaning