modernize: Use nullptr

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

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index b8cb2f1..46ec7be 100644 (file)
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2005-2014 by the Quassel Project                        *
+ *   Copyright (C) 2005-2018 by the Quassel Project                        *
  *   devel@quassel-irc.org                                                 *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -55,10 +55,11 @@ ChatView::ChatView(MessageFilter *filter, QWidget *parent)
 
 void ChatView::init(MessageFilter *filter)
 {
-    _bufferContainer = 0;
+    _bufferContainer = nullptr;
     _currentScaleFactor = 1;
     _invalidateFilter = false;
 
+    setAttribute(Qt::WA_AcceptTouchEvents);
     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
     setAlignment(Qt::AlignLeft|Qt::AlignBottom);
@@ -80,7 +81,7 @@ void ChatView::init(MessageFilter *filter)
     setScene(_scene);
 
     connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
-    _lastScrollbarPos = verticalScrollBar()->value();
+    _lastScrollbarPos = verticalScrollBar()->maximum();
 
     connect(Client::networkModel(), SIGNAL(markerLineSet(BufferId, MsgId)), SLOT(markerLineSet(BufferId, MsgId)));
 
@@ -108,7 +109,39 @@ bool ChatView::event(QEvent *event)
         }
     }
 
-    if (event->type() == QEvent::Wheel) {
+    if (event->type() == QEvent::TouchBegin && ((QTouchEvent*)event)->device()->type() == QTouchDevice::TouchScreen) {
+        // Enable scrolling by draging, disable selecting/clicking content
+        setDragMode(QGraphicsView::ScrollHandDrag);
+        setInteractive(false);
+        // if scrollbar is not visible we need to request backlog below else we need to accept
+        // the event now (return true) so that we will receive TouchUpdate and TouchEnd/TouchCancel
+        if (verticalScrollBar()->isVisible()) return true;
+    }
+
+    if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
+        // End scroll and reset settings to default
+        setDragMode(QGraphicsView::NoDrag);
+        setInteractive(true);
+        _firstTouchUpdateHappened = false;
+        return true;
+    }
+
+    if (event->type() == QEvent::TouchUpdate) {
+        if (!_firstTouchUpdateHappened) {
+            // After the first movement of a Touch-Point, calculate the distance in both axis
+            // and if the point moved more horizontally abort scroll.
+            QTouchEvent::TouchPoint p = ((QTouchEvent*)event)->touchPoints().at(0);
+            double dx = qAbs(p.lastPos().x() - p.pos().x());
+            double dy = qAbs(p.lastPos().y() - p.pos().y());
+            if (dx > dy) {
+                setDragMode(QGraphicsView::NoDrag);
+                setInteractive(true);
+            }
+            _firstTouchUpdateHappened = true;
+        }
+        // Applying the movement happens automatically by the drag-mode
+    }
+    if (event->type() == QEvent::Wheel || (event->type() == QEvent::TouchBegin && ((QTouchEvent*)event)->device()->type() == QTouchDevice::TouchScreen) || event->type() == QEvent::TouchUpdate) {
         if (!verticalScrollBar()->isVisible()) {
             scene()->requestBacklog();
             return true;
@@ -280,11 +313,11 @@ QList<ChatLine *> ChatView::visibleChatLinesSorted(Qt::ItemSelectionMode mode) c
 ChatLine *ChatView::lastVisibleChatLine(bool ignoreDayChange) const
 {
     if (!scene())
-        return 0;
+        return nullptr;
 
     QAbstractItemModel *model = scene()->model();
     if (!model || model->rowCount() == 0)
-        return 0;
+        return nullptr;
 
     int row = -1;
 
@@ -297,7 +330,7 @@ ChatLine *ChatView::lastVisibleChatLine(bool ignoreDayChange) const
     if (row >= 0)
         return scene()->chatLine(row);
 
-    return 0;
+    return nullptr;
 }