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qTox/src/chatlog/chatlog.cpp

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/*
Copyright (C) 2014 by Project Tox <https://tox.im>
This file is part of qTox, a Qt-based graphical interface for Tox.
This program is libre software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the COPYING file for more details.
*/
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#include "chatlog.h"
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#include "chatmessage.h"
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#include "chatlinecontent.h"
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#include <QDebug>
#include <QScrollBar>
#include <QApplication>
#include <QClipboard>
#include <QAction>
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#include <QTimer>
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template<class T>
T clamp(T x, T min, T max)
{
if(x > max)
return max;
if(x < min)
return min;
return x;
}
ChatLog::ChatLog(QWidget* parent)
: QGraphicsView(parent)
{
scene = new QGraphicsScene(this);
scene->setItemIndexMethod(QGraphicsScene::NoIndex);
setScene(scene);
setInteractive(true);
setAlignment(Qt::AlignTop | Qt::AlignLeft);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setDragMode(QGraphicsView::NoDrag);
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setViewportUpdateMode(BoundingRectViewportUpdate);
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//setRenderHint(QPainter::TextAntialiasing);
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setAcceptDrops(false);
setContextMenuPolicy(Qt::CustomContextMenu);
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const QColor selGraphColor = QColor(166,225,255);
selGraphItem = scene->addRect(0,0,0,0,selGraphColor.darker(120),selGraphColor);
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selGraphItem->setZValue(-10.0); //behind all items
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// copy action
copyAction = new QAction(this);
copyAction->setShortcut(QKeySequence::Copy);
addAction(copyAction);
connect(copyAction, &QAction::triggered, this, [ = ](bool)
{
copySelectedText();
});
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selectionTimer = new QTimer(this);
selectionTimer->setInterval(1000/60);
selectionTimer->setSingleShot(false);
selectionTimer->start();
connect(selectionTimer, &QTimer::timeout, this, &ChatLog::onSelectionTimerTimeout);
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}
ChatLog::~ChatLog()
{
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}
void ChatLog::clearSelection()
{
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for(int i=selFirstRow; i<=selLastRow && i<lines.size() && i >= 0; ++i)
lines[i]->selectionCleared();
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selFirstRow = -1;
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selLastRow = -1;
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selClickedCol = -1;
selClickedRow = -1;
selectionMode = None;
updateMultiSelectionRect();
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}
QRect ChatLog::getVisibleRect() const
{
return mapToScene(viewport()->rect()).boundingRect().toRect();
}
void ChatLog::updateSceneRect()
{
setSceneRect(QRectF(-margins.left(), -margins.top(), useableWidth(), (lines.empty() ? 0.0 : lines.last()->boundingSceneRect().bottom()) + margins.bottom() + margins.top()));
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}
qreal ChatLog::layout(int start, int end, qreal width)
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{
//qDebug() << "layout " << start << end;
if(lines.empty())
return false;
start = clamp<int>(start, 0, lines.size() - 1);
end = clamp<int>(end + 1, 0, lines.size());
qreal h = lines[start]->boundingSceneRect().top();
qreal deltaRepos = 0.0;
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for(int i = start; i < end; ++i)
{
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ChatLine* l = lines[i].get();
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qreal oldHeight = l->boundingSceneRect().height();
l->layout(width, QPointF(0.0, h));
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if(oldHeight != l->boundingSceneRect().height())
deltaRepos += oldHeight - l->boundingSceneRect().height();
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h += l->boundingSceneRect().height() + lineSpacing;
}
return deltaRepos;
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}
void ChatLog::partialUpdate()
{
checkVisibility();
if(visibleLines.empty())
return;
auto oldUpdateMode = viewportUpdateMode();
setViewportUpdateMode(NoViewportUpdate);
qreal repos;
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do
{
repos = 0;
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if(!visibleLines.empty())
{
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repos = layout(visibleLines.first()->getRowIndex(), visibleLines.last()->getRowIndex(), useableWidth());
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reposition(visibleLines.last()->getRowIndex()+1, lines.size(), -repos);
verticalScrollBar()->setValue(verticalScrollBar()->value() - repos);
}
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checkVisibility();
}
while(repos != 0);
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checkVisibility();
setViewportUpdateMode(oldUpdateMode);
updateSceneRect();
}
void ChatLog::fullUpdate()
{
layout(0, lines.size(), useableWidth());
checkVisibility();
updateSceneRect();
}
void ChatLog::mousePressEvent(QMouseEvent* ev)
{
QGraphicsView::mousePressEvent(ev);
QPointF scenePos = mapToScene(ev->pos());
if(ev->button() == Qt::LeftButton)
{
clickPos = ev->pos();
clearSelection();
}
if(ev->button() == Qt::RightButton)
{
if(!isOverSelection(scenePos))
clearSelection();
}
}
void ChatLog::mouseReleaseEvent(QMouseEvent* ev)
{
QGraphicsView::mouseReleaseEvent(ev);
QPointF scenePos = mapToScene(ev->pos());
if(ev->button() == Qt::RightButton)
{
if(!isOverSelection(scenePos))
clearSelection();
emit customContextMenuRequested(ev->pos());
}
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selectionScrollDir = NoDirection;
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}
void ChatLog::mouseMoveEvent(QMouseEvent* ev)
{
QGraphicsView::mouseMoveEvent(ev);
QPointF scenePos = mapToScene(ev->pos());
if(ev->buttons() & Qt::LeftButton)
{
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//autoscroll
if(ev->pos().y() < 0)
selectionScrollDir = Up;
else if(ev->pos().y() > height())
selectionScrollDir = Down;
else
selectionScrollDir = NoDirection;
//select
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if(selectionMode == None && (clickPos - ev->pos()).manhattanLength() > QApplication::startDragDistance())
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{
QPointF sceneClickPos = mapToScene(clickPos.toPoint());
ChatLineContent* content = getContentFromPos(sceneClickPos);
if(content)
{
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selClickedRow = content->getRow();
selClickedCol = content->getColumn();
selFirstRow = content->getRow();
selLastRow = content->getRow();
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content->selectionStarted(sceneClickPos);
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selectionMode = Precise;
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// ungrab mouse grabber
if(scene->mouseGrabberItem())
scene->mouseGrabberItem()->ungrabMouse();
}
}
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if(selectionMode != None && ev->pos() != lastPos)
{
lastPos = ev->pos();
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ChatLineContent* content = getContentFromPos(scenePos);
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if(content)
{
int row = content->getRow();
int col = content->getColumn();
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if(row >= selClickedRow)
selLastRow = row;
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if(row <= selClickedRow)
selFirstRow = row;
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if(row == selClickedRow && col == selClickedCol)
{
selectionMode = Precise;
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content->selectionMouseMove(scenePos);
selGraphItem->hide();
}
else
{
selectionMode = Multi;
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lines[selClickedRow]->selectionCleared();
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updateMultiSelectionRect();
}
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}
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}
}
}
ChatLineContent* ChatLog::getContentFromPos(QPointF scenePos) const
{
QGraphicsItem* item = scene->itemAt(scenePos, QTransform());
if(item && item->type() == ChatLineContent::ChatLineContentType)
return static_cast<ChatLineContent*>(item);
return nullptr;
}
bool ChatLog::isOverSelection(QPointF scenePos)
{
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if(selectionMode == Precise)
{
ChatLineContent* content = getContentFromPos(scenePos);
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if(content)
return content->isOverSelection(scenePos);
}
else if(selectionMode == Multi)
{
if(selGraphItem->rect().contains(scenePos))
return true;
}
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return false;
}
qreal ChatLog::useableWidth()
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{
return width() - verticalScrollBar()->sizeHint().width() - margins.right() - margins.left();
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}
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void ChatLog::reposition(int start, int end, qreal deltaY)
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{
if(lines.isEmpty())
return;
start = clamp<int>(start, 0, lines.size() - 1);
end = clamp<int>(end + 1, 0, lines.size());
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for(int i = start; i < end; ++i)
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{
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ChatLine* l = lines[i].get();
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l->moveBy(deltaY);
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}
}
void ChatLog::insertChatlineAtBottom(ChatLine::Ptr l)
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{
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if(!l.get())
return;
l->addToScene(scene);
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stickToBtm = stickToBottom();
l->setRowIndex(lines.size());
lines.append(l);
//partial refresh
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layout(lines.last()->getRowIndex() - 1, lines.size(), useableWidth());
updateSceneRect();
if(stickToBtm)
scrollToBottom();
checkVisibility();
}
void ChatLog::insertChatlineOnTop(ChatLine::Ptr l)
{
if(!l.get())
return;
//move all lines down by 1
for(ChatLine::Ptr l : lines)
l->setRowIndex(l->getRowIndex() + 1);
//add the new line
l->addToScene(scene);
l->setRowIndex(0);
lines.prepend(l);
//full refresh is required
layout(0, lines.size(), useableWidth());
updateSceneRect();
if(stickToBtm)
scrollToBottom();
checkVisibility();
}
void ChatLog::insertChatlineOnTop(const QList<ChatLine::Ptr>& newLines)
{
if(newLines.isEmpty())
return;
//move all lines down by n
int n = newLines.size();
for(ChatLine::Ptr l : lines)
l->setRowIndex(l->getRowIndex() + n);
//add the new line
for(ChatLine::Ptr l : newLines)
{
l->addToScene(scene);
l->setRowIndex(--n);
lines.prepend(l);
}
//full refresh is required
layout(0, lines.size(), useableWidth());
updateSceneRect();
if(stickToBtm)
scrollToBottom();
checkVisibility();
}
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bool ChatLog::stickToBottom()
{
return verticalScrollBar()->value() == verticalScrollBar()->maximum();
}
void ChatLog::scrollToBottom()
{
verticalScrollBar()->setValue(verticalScrollBar()->maximum());
updateGeometry();
checkVisibility();
}
QString ChatLog::getSelectedText() const
{
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if(selectionMode == Precise)
{
return lines[selClickedRow]->content[selClickedCol]->getSelectedText();
}
else if(selectionMode == Multi)
{
// build a nicely formatted message
QString out;
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QString lastSender;
for(int i=selFirstRow; i<=selLastRow && i>=0 && i<lines.size(); ++i)
{
if(lastSender != lines[i]->content[0]->getText() && !lines[i]->content[0]->getText().isEmpty())
{
//author changed
out += lines[i]->content[0]->getText() + ":\n";
lastSender = lines[i]->content[0]->getText();
}
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out += lines[i]->content[1]->getText();
out += "\n\n";
}
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return out;
}
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return QString();
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}
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QString ChatLog::toPlainText() const
{
QString out;
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for(ChatLine::Ptr l : lines)
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{
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out += QString("|%1 @%2|\n%3\n\n").arg(l->getContent(0)->getText(),l->getContent(2)->getText(),l->getContent(1)->getText());
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}
return out;
}
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bool ChatLog::isEmpty() const
{
return lines.isEmpty();
}
bool ChatLog::hasTextToBeCopied() const
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{
return selectionMode != None;
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}
void ChatLog::clear()
{
clearSelection();
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for(ChatLine::Ptr l : lines)
l->removeFromScene();
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lines.clear();
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visibleLines.clear();
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updateSceneRect();
}
void ChatLog::copySelectedText() const
{
QString text = getSelectedText();
QClipboard* clipboard = QApplication::clipboard();
clipboard->setText(text);
}
void ChatLog::checkVisibility()
{
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if(lines.empty())
return;
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// find first visible row
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QList<ChatLine::Ptr>::const_iterator upperBound;
upperBound = std::upper_bound(lines.cbegin(), lines.cend(), getVisibleRect().top(), [](const qreal lhs, const ChatLine::Ptr rhs)
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{
return lhs < rhs->boundingSceneRect().bottom();
});
// find last visible row
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QList<ChatLine::Ptr>::const_iterator lowerBound;
lowerBound = std::lower_bound(lines.cbegin(), lines.cend(), getVisibleRect().bottom(), [](const ChatLine::Ptr lhs, const qreal rhs)
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{
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return lhs->boundingSceneRect().top() < rhs;
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});
// set visibilty
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QList<ChatLine::Ptr> newVisibleLines;
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for(auto itr = upperBound; itr != lowerBound; ++itr)
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{
newVisibleLines.append(*itr);
if(!visibleLines.contains(*itr))
(*itr)->visibilityChanged(true);
visibleLines.removeOne(*itr);
}
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for(ChatLine::Ptr line : visibleLines)
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line->visibilityChanged(false);
visibleLines = newVisibleLines;
// enforce order
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std::sort(visibleLines.begin(), visibleLines.end(), [](const ChatLine::Ptr lhs, const ChatLine::Ptr rhs)
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{
return lhs->getRowIndex() < rhs->getRowIndex();
});
//if(!visibleLines.empty())
// qDebug() << "visible from " << visibleLines.first()->getRowIndex() << "to " << visibleLines.last()->getRowIndex() << " total " << visibleLines.size();
}
void ChatLog::scrollContentsBy(int dx, int dy)
{
QGraphicsView::scrollContentsBy(dx, dy);
partialUpdate();
}
void ChatLog::resizeEvent(QResizeEvent* ev)
{
bool stb = stickToBottom();
QGraphicsView::resizeEvent(ev);
if(lines.count() > 300)
partialUpdate();
else
fullUpdate();
if(stb)
scrollToBottom();
updateMultiSelectionRect();
}
void ChatLog::updateMultiSelectionRect()
{
if(selectionMode == Multi && selFirstRow >= 0 && selLastRow >= 0)
{
QRectF selBBox;
selBBox = selBBox.united(lines[selFirstRow]->boundingSceneRect());
selBBox = selBBox.united(lines[selLastRow]->boundingSceneRect());
selGraphItem->setRect(selBBox);
selGraphItem->show();
}
else
{
selGraphItem->hide();
}
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}
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void ChatLog::onSelectionTimerTimeout()
{
const int scrollSpeed = 10;
switch(selectionScrollDir)
{
case Up:
verticalScrollBar()->setValue(verticalScrollBar()->value() - scrollSpeed);
break;
case Down:
verticalScrollBar()->setValue(verticalScrollBar()->value() + scrollSpeed);
break;
default:
break;
}
}