Wordwrap in ChatView almost working.

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

diff --git a/src/qtui/chatitem.cpp b/src/qtui/chatitem.cpp
index c12d5c5..ff81259 100644 (file)
--- a/src/qtui/chatitem.cpp
+++ b/src/qtui/chatitem.cpp
@@ -28,10 +28,9 @@
 #include "qtui.h"
 
 ChatItem::ChatItem(const QPersistentModelIndex &index_, QGraphicsItem *parent) : QGraphicsItem(parent), _index(index_) {
-  QFontMetricsF *metrics = QtUi::style()->fontMetrics(data(ChatLineModel::FormatRole).value<UiStyle::FormatList>().at(0).second);
-  _lineHeight = metrics->lineSpacing();
-  _lineLeading = metrics->leading();
+  _fontMetrics = QtUi::style()->fontMetrics(data(ChatLineModel::FormatRole).value<UiStyle::FormatList>().at(0).second);
   _layout = 0;
+  _lines = 0;
 }
 
 ChatItem::~ChatItem() {
@@ -47,38 +46,50 @@ QVariant ChatItem::data(int role) const {
 }
 
 int ChatItem::setWidth(int w) {
+  w -= 10;
   if(w == _boundingRect.width()) return _boundingRect.height();
   int h = heightForWidth(w);
   _boundingRect.setWidth(w);
   _boundingRect.setHeight(h);
+  if(haveLayout()) updateLayout();
   return h;
 }
 
 int ChatItem::heightForWidth(int width) {
   if(data(ChatLineModel::ColumnTypeRole).toUInt() != ChatLineModel::ContentsColumn)
-    return _lineHeight; // only contents can be multi-line
-
-  QVariantList wrapList = data(ChatLineModel::WrapListRole).toList();
-  int lines = 1;
-  int offset = 0;
-  for(int i = 0; i < wrapList.count(); i+=2) {
-    if(wrapList.at(i+1).toUInt() - offset < width) continue;
-    lines++;
-    if(i > 0) {
-      if(offset < wrapList.at(i-1).toUInt()) offset = wrapList.at(i-1).toUInt();
-      else offset += width;
-    } else {
-      offset += width;
+    return fontMetrics()->lineSpacing(); // only contents can be multi-line
+
+  ChatLineModel::WrapList wrapList = data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>();
+  _lines = 1;
+  qreal w = 0;
+  for(int i = 0; i < wrapList.count(); i++) {
+    w += wrapList.at(i).width;
+    if(w <= width) {
+      w += wrapList.at(i).trailing;
+      continue;
+    }
+    _lines++;
+    w = wrapList.at(i).width;
+    while(w >= width) {  // handle words longer than a line
+      _lines++;
+      // We do not want to compute an exact split position (that would require us to calculate glyph widths
+      // and also apply formats in this step...)
+      // Just using width should be a good estimate, but since a character can't be split in the middle, we
+      // subtract averageCharWidth as well... sometimes this won't be enough, but meh.
+      w -= width - 4*fontMetrics()->averageCharWidth();
     }
-    i-=2;
   }
-  return lines * _lineHeight;
+  return _lines * fontMetrics()->lineSpacing();
 }
 
 void ChatItem::layout() {
-  if(_layout) return;
+  if(haveLayout()) return;
   _layout = new QTextLayout(data(MessageModel::DisplayRole).toString());
 
+  QTextOption option;
+  option.setWrapMode(QTextOption::WrapAnywhere);
+  _layout->setTextOption(option);
+
   // Convert format information into a FormatRange
   QList<QTextLayout::FormatRange> formatRanges;
   UiStyle::FormatList formatList = data(MessageModel::FormatRole).value<UiStyle::FormatList>();
@@ -92,8 +103,18 @@ void ChatItem::layout() {
   }
   if(i > 0) formatRanges.last().length = _layout->text().length() - formatRanges.last().start;
   _layout->setAdditionalFormats(formatRanges);
+  updateLayout();
+}
+
+void ChatItem::updateLayout() {
+  if(!haveLayout()) layout();
 
   // Now layout
+  ChatLineModel::WrapList wrapList = data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>();
+  if(!wrapList.count()) return; // empty chatitem
+  int wordidx = 0;
+  ChatLineModel::Word word = wrapList.at(0);
+
   qreal h = 0;
   _layout->beginLayout();
   forever {
@@ -101,8 +122,30 @@ void ChatItem::layout() {
     if (!line.isValid())
       break;
 
-    line.setLineWidth(width());
-    h += _lineLeading;
+    if(word.width >= width()) {
+      line.setLineWidth(width());
+      word.width -= line.naturalTextWidth();
+      word.start = line.textStart() + line.textLength();
+      //qDebug() << "setting width: " << width();
+    } else {
+      int w = 0;
+      while((w += word.width) <= width() && wordidx < wrapList.count()) {
+        w += word.trailing;
+        if(++wordidx < wrapList.count()) word = wrapList.at(wordidx);
+        else {
+          // last word (and it fits), but if we expected an extra line, wrap anyway here
+          // yeah, this is cheating, but much cheaper than computing widths ourself
+          if(_layout->lineCount() < _lines) {
+            wordidx--; qDebug() << "trigger!" << _lines << _layout->text();
+            break;
+          }
+        }
+      }
+      int lastcol = wordidx < wrapList.count() ? word.start : _layout->text().length();
+      line.setNumColumns(lastcol - line.textStart());// qDebug() << "setting cols:" << lastcol - line.textStart();
+    }
+
+    h += fontMetrics()->leading();
     line.setPosition(QPointF(0, h));
     h += line.height();
   }
@@ -118,6 +161,13 @@ void ChatItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
   Q_UNUSED(option); Q_UNUSED(widget);
   layout();
   _layout->draw(painter, QPointF(0,0), QVector<QTextLayout::FormatRange>(), boundingRect());
+  painter->drawRect(boundingRect());
+  int width = 0;
+  QVariantList wrapList = data(ChatLineModel::WrapListRole).toList();
+  for(int i = 2; i < wrapList.count(); i+=2) {
+    QRect r(wrapList[i-1].toUInt(), 0, wrapList[i+1].toUInt() - wrapList[i-1].toUInt(), fontMetrics()->lineSpacing());
+    painter->drawRect(r);
+  }
 }
 
 /*