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/*
SPDX-FileCopyrightText: 2023 David Edmundson <davidedmundson@kde.org>
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include "x11windowscreenrelativepositioner.h"
#include <QScreen>
#include <KWindowSystem>
X11WindowScreenRelativePositioner::X11WindowScreenRelativePositioner(QWindow *window)
: QObject(window)
, m_window(window)
{
if (!KWindowSystem::isPlatformX11()) {
qCritical("X11WindowScreenRelativePositioner should only be used on X11 windows");
}
m_window->installEventFilter(this);
connect(m_window, &QWindow::screenChanged, this, &X11WindowScreenRelativePositioner::handleScreenChanged);
handleScreenChanged();
}
void X11WindowScreenRelativePositioner::setAnchors(Qt::Edges anchors)
{
if (m_anchors == anchors) {
return;
}
m_anchors = anchors;
Q_EMIT anchorsChanged();
polish();
}
void X11WindowScreenRelativePositioner::setMargins(const QMargins &margins)
{
if (m_margins == margins) {
return;
}
m_margins = margins;
Q_EMIT marginsChanged();
polish();
}
bool X11WindowScreenRelativePositioner::eventFilter(QObject *watched, QEvent *event)
{
if (watched != m_window) {
return false;
}
switch (event->type()) {
case QEvent::UpdateRequest:
updatePolish();
break;
case QEvent::Resize:
case QEvent::Expose:
polish();
break;
default:
break;
}
return false;
}
void X11WindowScreenRelativePositioner::polish()
{
m_needsRepositioning = true;
m_window->requestUpdate();
}
void X11WindowScreenRelativePositioner::updatePolish()
{
if (m_needsRepositioning) {
reposition();
m_needsRepositioning = false;
}
}
void X11WindowScreenRelativePositioner::reposition()
{
QScreen *screen = m_window->screen();
QRect screenRect = screen->availableGeometry();
screenRect = screenRect.marginsRemoved(m_margins);
QRect targetRect;
// Y
if (m_anchors.testFlags({Qt::TopEdge, Qt::BottomEdge})) {
targetRect.setTop(screenRect.top());
targetRect.setBottom(screenRect.bottom());
} else {
targetRect.setHeight(m_window->height());
if (m_anchors.testFlag(Qt::TopEdge)) {
targetRect.moveTop(screenRect.top());
} else if (m_anchors.testFlag(Qt::BottomEdge)) {
targetRect.moveBottom(screenRect.bottom());
} else {
targetRect.moveCenter(QPoint(0, screenRect.center().y()));
}
}
// X
if (m_anchors.testFlags({Qt::LeftEdge, Qt::RightEdge})) {
targetRect.setLeft(screenRect.left());
targetRect.setRight(screenRect.right());
} else {
targetRect.setWidth(m_window->width());
if (m_anchors.testFlag(Qt::LeftEdge)) {
targetRect.moveLeft(screenRect.left());
} else if (m_anchors.testFlag(Qt::RightEdge)) {
targetRect.moveRight(screenRect.right());
} else {
targetRect.moveCenter(QPoint(screenRect.center().x(), targetRect.center().y()));
}
}
m_window->setGeometry(targetRect);
}
void X11WindowScreenRelativePositioner::handleScreenChanged()
{
QScreen *newScreen = m_window->screen();
if (newScreen == m_screen) {
return;
}
if (m_screen) {
disconnect(m_screen, nullptr, this, nullptr);
}
m_screen = newScreen;
connect(newScreen, &QScreen::availableGeometryChanged, this, &X11WindowScreenRelativePositioner::polish);
polish();
}
#include "moc_x11windowscreenrelativepositioner.cpp"
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