}
void ChatItem::doLayout(QTextLayout *layout) const {
- qreal h = 0;
layout->beginLayout();
- forever {
- QTextLine line = layout->createLine();
- if(!line.isValid())
- break;
+ QTextLine line = layout->createLine();
+ if(line.isValid()) {
line.setLineWidth(width());
- line.setPosition(QPointF(0, h));
- h += line.height();
+ line.setPosition(QPointF(0,0));
}
layout->endLayout();
}
}
qreal ContentsChatItem::setGeometryByWidth(qreal w) {
- if(w == width()) {
- //qDebug() << Q_FUNC_INFO << "Geometry change requested with identical width!";
- }
- // We use this for reloading layout info as well
- //if(w != width()) {
+ // We use this for reloading layout info as well, so we can't bail out if the width doesn't change
+
+ // compute height
+ int lines = 1;
+ WrapColumnFinder finder(this);
+ while(finder.nextWrapColumn(w) > 0)
+ lines++;
+ qreal h = lines * fontMetrics()->lineSpacing();
+ delete _data;
+ _data = 0;
+
+ if(w != width() || h != height()) {
prepareGeometryChange();
- setWidth(w);
- QTextLayout layout;
- initLayout(&layout);
- setHeight(layout.boundingRect().height());
- delete _data;
- _data = 0;
- //}
- return height();
+ setGeometry(w, h);
+ }
+ return h;
+}
+
+void ContentsChatItem::doLayout(QTextLayout *layout) const {
+ ChatLineModel::WrapList wrapList = data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>();
+ if(!wrapList.count()) return; // empty chatitem
+
+ qreal h = 0;
+ WrapColumnFinder finder(this);
+ layout->beginLayout();
+ forever {
+ QTextLine line = layout->createLine();
+ if(!line.isValid())
+ break;
+
+ int col = finder.nextWrapColumn(width());
+ line.setNumColumns(col >= 0 ? col - line.textStart() : layout->text().length());
+ line.setPosition(QPointF(0, h));
+ h += fontMetrics()->lineSpacing();
+ }
+ layout->endLayout();
}
// NOTE: This method is not threadsafe and not reentrant!
/*************************************************************************************************/
+ContentsChatItem::WrapColumnFinder::WrapColumnFinder(const ChatItem *_item)
+ : item(_item),
+ wrapList(item->data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>()),
+ wordidx(0),
+ lineCount(0),
+ choppedTrailing(0)
+{
+}
+
+ContentsChatItem::WrapColumnFinder::~WrapColumnFinder() {
+}
+
+qint16 ContentsChatItem::WrapColumnFinder::nextWrapColumn(qreal width) {
+ if(wordidx >= wrapList.count())
+ return -1;
+
+ lineCount++;
+ qreal targetWidth = lineCount * width + choppedTrailing;
+
+ qint16 start = wordidx;
+ qint16 end = wrapList.count() - 1;
+
+ // check if the whole line fits
+ if(wrapList.at(end).endX <= targetWidth) // || start == end)
+ return -1;
+
+ // check if we have a very long word that needs inter word wrap
+ if(wrapList.at(start).endX > targetWidth) {
+ if(!line.isValid()) {
+ item->initLayoutHelper(&layout, QTextOption::NoWrap);
+ layout.beginLayout();
+ line = layout.createLine();
+ layout.endLayout();
+ }
+ return line.xToCursor(targetWidth, QTextLine::CursorOnCharacter);
+ }
+
+ while(true) {
+ if(start + 1 == end) {
+ wordidx = end;
+ const ChatLineModel::Word &lastWord = wrapList.at(start); // the last word we were able to squeeze in
+
+ // both cases should be cought preliminary
+ Q_ASSERT(lastWord.endX <= targetWidth); // ensure that "start" really fits in
+ Q_ASSERT(end < wrapList.count()); // ensure that start isn't the last word
+
+ choppedTrailing += lastWord.trailing - (targetWidth - lastWord.endX);
+ return wrapList.at(wordidx).start;
+ }
+
+ qint16 pivot = (end + start) / 2;
+ if(wrapList.at(pivot).endX > targetWidth) {
+ end = pivot;
+ } else {
+ start = pivot;
+ }
+ }
+ Q_ASSERT(false);
+ return -1;
+}
+
+/*************************************************************************************************/
+