////  ChatMessageArea.cpp//  interface/src/ui////  Created by Ryan Huffman on 4/11/14.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include "Application.h"#include "ChatMessageArea.h"#include <QAbstractTextDocumentLayout>#include <QWheelEvent> ChatMessageArea::ChatMessageArea(bool useFixedHeight) : QTextBrowser(), _useFixedHeight(useFixedHeight) {    setOpenLinks(false);     connect(document()->documentLayout(), &QAbstractTextDocumentLayout::documentSizeChanged,            this, &ChatMessageArea::updateLayout);        connect(this, &QTextBrowser::anchorClicked, Application::getInstance(), &Application::openUrl);} void ChatMessageArea::setHtml(const QString& html) {    // Create format with updated line height    QTextBlockFormat format;    format.setLineHeight(CHAT_MESSAGE_LINE_HEIGHT, QTextBlockFormat::ProportionalHeight);     // Possibly a bug in QT, the format won't take effect if `insertHtml` is used first.  Inserting a space and deleting    // it after ensures the format is applied.    QTextCursor cursor = textCursor();    cursor.setBlockFormat(format);    cursor.insertText(" ");    cursor.insertHtml(html);    cursor.setPosition(0);    cursor.deleteChar();} void ChatMessageArea::updateLayout() {    if (_useFixedHeight) {        setFixedHeight(document()->size().height());        updateGeometry();        emit sizeChanged(size());    }} void ChatMessageArea::setSize(const QSize& size) {    setFixedHeight(size.height());    updateGeometry();} void ChatMessageArea::wheelEvent(QWheelEvent* event) {    // Capture wheel events to stop Ctrl-WheelUp/Down zooming    event->ignore();}