Bring back workaround for the unwanted scroll-on-bufferswitch

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

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index dd042c0..4a5e286 100644 (file)
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2005-07 by the Quassel IRC Team                         *
+ *   Copyright (C) 2005-08 by the Quassel Project                          *
  *   devel@quassel-irc.org                                                 *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -19,69 +19,84 @@
  ***************************************************************************/
 
 #include <QGraphicsTextItem>
+#include <QScrollBar>
 
-#include "buffer.h"
-#include "chatline.h"
+#include "chatlinemodelitem.h"
 #include "chatscene.h"
 #include "chatview.h"
+#include "client.h"
+#include "messagefilter.h"
 #include "quasselui.h"
 
-ChatView::ChatView(Buffer *buf, QWidget *parent) : QGraphicsView(parent) {
-  _scene = new ChatScene(buf, this);
-  setScene(_scene);
-
-  QGraphicsTextItem *item = scene()->addText(buf->name());
-
+ChatView::ChatView(BufferId bufferId, QWidget *parent)
+  : QGraphicsView(parent),
+    AbstractChatView()
+{
+  QList<BufferId> filterList;
+  filterList.append(bufferId);
+  MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
+  init(filter);
 }
 
-
-ChatView::~ChatView() {
-
+ChatView::ChatView(MessageFilter *filter, QWidget *parent)
+  : QGraphicsView(parent),
+    AbstractChatView()
+{
+  init(filter);
 }
 
+void ChatView::init(MessageFilter *filter) {
+  setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+  setAlignment(Qt::AlignBottom);
+  setInteractive(true);
 
-ChatScene *ChatView::scene() const {
-  return _scene;
-}
+  _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
+  connect(_scene, SIGNAL(sceneHeightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
+  setScene(_scene);
 
-/*
-void ChatView::clear()
-{
+  _lastScrollbarPos = verticalScrollBar()->maximum();
+  connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
 }
 
-void ChatView::prependMsg(AbstractUiMsg *msg) {
-  ChatLine *line = dynamic_cast<ChatLine*>(msg);
-  Q_ASSERT(line);
-  prependChatLine(line);
+void ChatView::resizeEvent(QResizeEvent *event) {
+  QGraphicsView::resizeEvent(event);
+  scene()->setWidth(viewport()->width() - 2);  // FIXME figure out why we have to hardcode the -2 here -> Qt-Bug most probably
+  verticalScrollBar()->setValue(verticalScrollBar()->maximum());
 }
 
-void ChatView::prependChatLine(ChatLine *line) {
-  qDebug() << "prepending";
+void ChatView::sceneHeightChanged(qreal dh) {
+  QAbstractSlider *vbar = verticalScrollBar();
+  Q_ASSERT(vbar);
+  if(vbar->maximum() - vbar->value() <= dh + 5) // in case we had scrolled only about half a line to the bottom we allow a grace of 5
+    vbar->setValue(vbar->maximum());
 }
 
-void ChatView::prependChatLines(QList<ChatLine *> clist) {
+void ChatView::verticalScrollbarChanged(int newPos) {
+  QAbstractSlider *vbar = verticalScrollBar();
+  Q_ASSERT(vbar);
 
-}
+  if(vbar->maximum() - vbar->value() <= 5) // FIXME workaround the fact that the view gets scrolled up a few px on buffer change
+    vbar->setValue(vbar->maximum());
 
-void ChatView::appendMsg(AbstractUiMsg *msg) {
-  ChatLine *line = dynamic_cast<ChatLine*>(msg);
-  Q_ASSERT(line);
-  appendChatLine(line);
-}
+  if(newPos < _lastScrollbarPos) {
+    int relativePos = 100;
+    if(vbar->maximum() - vbar->minimum() != 0)
+      relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
 
-void ChatView::appendChatLine(ChatLine *line) {
-  qDebug() << "appending";
+    if(relativePos < 20) {
+      scene()->requestBacklog();
+    }
+  }
+  _lastScrollbarPos = newPos;
 }
 
+MsgId ChatView::lastMsgId() const {
+  if(!scene())
+    return MsgId();
 
-void ChatView::appendChatLines(QList<ChatLine *> list) {
-  foreach(ChatLine *line, list) {
-    
-  }
-}
+  QAbstractItemModel *model = scene()->model();
+  if(!model || model->rowCount() == 0)
+    return MsgId();
 
-void ChatView::setContents(QList<ChatLine *> list) {
-  qDebug() << "setting" << list.count();
-  appendChatLines(list);
+  return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
 }
-*/