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Update chat window to only scroll when at the bottom

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It can be frustrating when scrolling up to read a message to have the
window forcibly scrolled to the bottom when a new message appears.
This commit is contained in:
Ryan Huffman 2014-04-10 12:34:45 -07:00
parent de475ee46c
commit 16a2367b29
2 changed files with 28 additions and 2 deletions
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28
interface/src/ui/ChatWindow.cpp
View file

@ -154,10 +154,18 @@ void ChatWindow::addTimeStamp() {
"padding: 4px;");
timeLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
timeLabel->setAlignment(Qt::AlignHCenter);
bool atBottom = isAtBottom();
ui->messagesGridLayout->addWidget(timeLabel, ui->messagesGridLayout->rowCount(), 0, 1, 2);
ui->messagesGridLayout->parentWidget()->updateGeometry();
Application::processEvents();
numMessagesAfterLastTimeStamp = 0;
if (atBottom) {
scrollToBottom();
}
}
}
@ -245,12 +253,15 @@ void ChatWindow::messageReceived(const QXmppMessage& message) {
messageLabel->setStyleSheet(messageLabel->styleSheet() + "; background-color: #e1e8ea");
}
bool atBottom = isAtBottom();
ui->messagesGridLayout->addWidget(userLabel, ui->messagesGridLayout->rowCount(), 0);
ui->messagesGridLayout->addWidget(messageLabel, ui->messagesGridLayout->rowCount() - 1, 1);
ui->messagesGridLayout->parentWidget()->updateGeometry();
Application::processEvents();
QScrollBar* verticalScrollBar = ui->messagesScrollArea->verticalScrollBar();
verticalScrollBar->setSliderPosition(verticalScrollBar->maximum());
if (atBottom) {
scrollToBottom();
}
++numMessagesAfterLastTimeStamp;
if (message.stamp().isValid()) {
@ -260,4 +271,17 @@ void ChatWindow::messageReceived(const QXmppMessage& message) {
}
}
bool ChatWindow::isAtBottom() {
QScrollBar* verticalScrollBar = ui->messagesScrollArea->verticalScrollBar();
qDebug() << "Checking for bottom " << verticalScrollBar->sliderPosition() << " " << verticalScrollBar->maximum();
return verticalScrollBar->sliderPosition() == verticalScrollBar->maximum();
}
// Scroll chat message area to bottom.
void ChatWindow::scrollToBottom() {
QScrollBar* verticalScrollBar = ui->messagesScrollArea->verticalScrollBar();
qDebug() << "Scrolling to " << verticalScrollBar->maximum();
verticalScrollBar->setSliderPosition(verticalScrollBar->maximum());
}
#endif

2
interface/src/ui/ChatWindow.h
View file

@ -48,6 +48,8 @@ private:
#endif
void startTimerForTimeStamps();
void addTimeStamp();
bool isAtBottom();
void scrollToBottom();
Ui::ChatWindow* ui;
int numMessagesAfterLastTimeStamp;