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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "formeditorgraphicsview.h"
#include "formeditoritem.h"
#include "formeditorwidget.h"
#include "navigation2d.h"
#include <QAction>
#include <QCoreApplication>
#include <QGraphicsItem>
#include <QGraphicsProxyWidget>
#include <QGraphicsWidget>
#include <QScrollBar>
#include <QWheelEvent>
#include <QTimer>
namespace QmlDesigner {
FormEditorGraphicsView::FormEditorGraphicsView(QWidget *parent)
: QGraphicsView(parent)
{
setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
setResizeAnchor(QGraphicsView::AnchorViewCenter);
setAlignment(Qt::AlignCenter);
setCacheMode(QGraphicsView::CacheNone);
setViewportUpdateMode(QGraphicsView::MinimalViewportUpdate);
setOptimizationFlags(QGraphicsView::DontSavePainterState);
setRenderHint(QPainter::Antialiasing, false);
setFrameShape(QFrame::NoFrame);
setAutoFillBackground(true);
setBackgroundRole(QPalette::Window);
activateCheckboardBackground();
// as mousetracking only works for mouse key it is better to handle it in the
// eventFilter method so it works also for the space scrolling case as expected
QCoreApplication::instance()->installEventFilter(this);
QmlDesigner::Navigation2dFilter *filter = new QmlDesigner::Navigation2dFilter(viewport());
connect(filter, &Navigation2dFilter::zoomIn, this, &FormEditorGraphicsView::zoomIn);
connect(filter, &Navigation2dFilter::zoomOut, this, &FormEditorGraphicsView::zoomOut);
connect(filter, &Navigation2dFilter::panChanged, [this](const QPointF &direction) {
Navigation2dFilter::scroll(direction, horizontalScrollBar(), verticalScrollBar());
});
auto zoomChanged = &Navigation2dFilter::zoomChanged;
connect(filter, zoomChanged, [this](double s, const QPointF &/*pos*/) {
if (auto trans = transform() * QTransform::fromScale(1.0 + s, 1.0 + s); trans.m11() > 0) {
setTransform(trans);
emit this->zoomChanged(transform().m11());
}
});
viewport()->installEventFilter(filter);
}
bool FormEditorGraphicsView::eventFilter(QObject *watched, QEvent *event)
{
if (m_isPanning != Panning::NotStarted) {
if (event->type() == QEvent::Leave && m_isPanning == Panning::SpaceKeyStarted) {
// there is no way to keep the cursor so we stop panning here
stopPanning(event);
}
if (event->type() == QEvent::MouseMove) {
auto mouseEvent = static_cast<QMouseEvent *>(event);
if (!m_panningStartPosition.isNull()) {
horizontalScrollBar()->setValue(horizontalScrollBar()->value() -
(mouseEvent->x() - m_panningStartPosition.x()));
verticalScrollBar()->setValue(verticalScrollBar()->value() -
(mouseEvent->y() - m_panningStartPosition.y()));
}
m_panningStartPosition = mouseEvent->pos();
event->accept();
return true;
}
}
return QGraphicsView::eventFilter(watched, event);
}
void FormEditorGraphicsView::wheelEvent(QWheelEvent *event)
{
if (event->modifiers().testFlag(Qt::ControlModifier))
event->ignore();
QGraphicsView::wheelEvent(event);
}
void FormEditorGraphicsView::mousePressEvent(QMouseEvent *event)
{
if (m_isPanning == Panning::NotStarted) {
if (event->buttons().testFlag(Qt::MiddleButton))
startPanning(event);
else
QGraphicsView::mousePressEvent(event);
}
}
void FormEditorGraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
// not sure why buttons() are empty here, but we have that information from the enum
if (m_isPanning == Panning::MouseWheelStarted)
stopPanning(event);
else
QGraphicsView::mouseReleaseEvent(event);
}
bool isTextInputItem(QGraphicsItem *item)
{
if (item && item->isWidget()) {
auto graphicsWidget = static_cast<QGraphicsWidget *>(item);
auto textInputProxyWidget = qobject_cast<QGraphicsProxyWidget *>(graphicsWidget);
if (textInputProxyWidget && textInputProxyWidget->widget() && (
strcmp(textInputProxyWidget->widget()->metaObject()->className(), "QLineEdit") == 0 ||
strcmp(textInputProxyWidget->widget()->metaObject()->className(), "QTextEdit") == 0)) {
return true;
}
}
return false;
}
void FormEditorGraphicsView::keyPressEvent(QKeyEvent *event)
{
// check for autorepeat to avoid a stoped space panning by leave event to be restarted
if (!event->isAutoRepeat() && m_isPanning == Panning::NotStarted && event->key() == Qt::Key_Space &&
!isTextInputItem(scene()->focusItem())) {
startPanning(event);
return;
}
QGraphicsView::keyPressEvent(event);
}
void FormEditorGraphicsView::keyReleaseEvent(QKeyEvent *event)
{
if (event->key() == Qt::Key_Space && !event->isAutoRepeat() && m_isPanning == Panning::SpaceKeyStarted)
stopPanning(event);
QGraphicsView::keyReleaseEvent(event);
}
void FormEditorGraphicsView::startPanning(QEvent *event)
{
if (event->type() == QEvent::KeyPress)
m_isPanning = Panning::SpaceKeyStarted;
else
m_isPanning = Panning::MouseWheelStarted;
viewport()->setCursor(Qt::ClosedHandCursor);
event->accept();
}
void FormEditorGraphicsView::stopPanning(QEvent *event)
{
m_isPanning = Panning::NotStarted;
m_panningStartPosition = QPoint();
viewport()->unsetCursor();
event->accept();
}
void FormEditorGraphicsView::setRootItemRect(const QRectF &rect)
{
m_rootItemRect = rect;
viewport()->update();
}
QRectF FormEditorGraphicsView::rootItemRect() const
{
return m_rootItemRect;
}
void FormEditorGraphicsView::activateCheckboardBackground()
{
const int checkerbordSize = 20;
QPixmap tilePixmap(checkerbordSize * 2, checkerbordSize * 2);
tilePixmap.fill(Qt::white);
QPainter tilePainter(&tilePixmap);
QColor color(220, 220, 220);
tilePainter.fillRect(0, 0, checkerbordSize, checkerbordSize, color);
tilePainter.fillRect(checkerbordSize, checkerbordSize, checkerbordSize, checkerbordSize, color);
tilePainter.end();
setBackgroundBrush(tilePixmap);
}
void FormEditorGraphicsView::activateColoredBackground(const QColor &color)
{
setBackgroundBrush(color);
}
void FormEditorGraphicsView::drawBackground(QPainter *painter, const QRectF &rectangle)
{
painter->save();
painter->setBrushOrigin(0, 0);
painter->fillRect(rectangle.intersected(rootItemRect()), backgroundBrush());
// paint rect around editable area
painter->setPen(Qt::black);
painter->drawRect(rootItemRect());
painter->restore();
}
void FormEditorGraphicsView::frame(const QRectF &boundingRect)
{
fitInView(boundingRect, Qt::KeepAspectRatio);
}
void FormEditorGraphicsView::setZoomFactor(double zoom)
{
resetTransform();
scale(zoom, zoom);
}
} // namespace QmlDesigner
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