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Add new selection style : free selection.

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Use like normal selection + hold the ctrl key.
The code made in this commit are largely inspired by the the rubber band of QGraphicsView.


git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@5716 bfdf4180-ca20-0410-9c96-a3a8aa849046
This commit is contained in:
blacksun
2019-01-23 17:08:04 +00:00
parent 3d17947074
commit ee44b4e8a2
3 changed files with 109 additions and 17 deletions
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100
sources/diagramview.cpp
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@@ -409,9 +409,16 @@ void DiagramView::mousePressEvent(QMouseEvent *e)
//Start drag view when hold the middle button
if (e->button() == Qt::MidButton)
{
m_rubber_band_origin = e->pos();
m_drag_last_pos = e->pos();
viewport()->setCursor(Qt::ClosedHandCursor);
}
else if (e->button() == Qt::LeftButton &&
e->modifiers() == Qt::CTRL)
{
m_free_rubberbanding = true;
m_free_rubberband = QPolygon();
QGraphicsView::mousePressEvent(e);
}
else QGraphicsView::mousePressEvent(e);
}
@@ -429,12 +436,50 @@ void DiagramView::mouseMoveEvent(QMouseEvent *e)
{
QScrollBar *h = horizontalScrollBar();
QScrollBar *v = verticalScrollBar();
QPointF pos = m_rubber_band_origin - e -> pos();
m_rubber_band_origin = e -> pos();
QPointF pos = m_drag_last_pos - e -> pos();
m_drag_last_pos = e -> pos();
h -> setValue(h -> value() + pos.x());
v -> setValue(v -> value() + pos.y());
adjustSceneRect();
}
else if (m_free_rubberbanding)
{
//Update old free rubberband
if (viewportUpdateMode() != QGraphicsView::NoViewportUpdate && !m_free_rubberband.isEmpty())
{
if (viewportUpdateMode() != QGraphicsView::FullViewportUpdate) {
viewport()->update(m_free_rubberband.boundingRect().toRect());
}
else {
update();
}
}
//Stop polygon rubberbanding if user has let go of all buttons (even
//if we didn't get the release events)
if (!e->buttons()) {
m_free_rubberbanding = false;
m_free_rubberband = QPolygon();
return;
}
m_free_rubberband.append(mapToScene(e->pos()));
emit freeRubberBandChanged(m_free_rubberband);
if (viewportUpdateMode() != QGraphicsView::NoViewportUpdate)
{
if (viewportUpdateMode() != QGraphicsView::FullViewportUpdate) {
viewport()->update(mapFromScene(m_free_rubberband.boundingRect()));
}
else {
update();
}
}
//Set the new selection area
QPainterPath selection_area;
selection_area.addPolygon(m_free_rubberband);
m_diagram->setSelectionArea(selection_area);
}
else QGraphicsView::mouseMoveEvent(e);
}
@@ -447,10 +492,28 @@ void DiagramView::mouseReleaseEvent(QMouseEvent *e)
{
if (m_event_interface && m_event_interface->mouseReleaseEvent(e)) return;
//Stop drag view
if (e -> button() == Qt::MidButton) viewport()->setCursor(Qt::ArrowCursor);
else QGraphicsView::mouseReleaseEvent(e);
//Stop drag view
if (e -> button() == Qt::MidButton) {
viewport()->setCursor(Qt::ArrowCursor);
}
else if (m_free_rubberbanding && !e->buttons())
{
if (viewportUpdateMode() != QGraphicsView::NoViewportUpdate)
{
if (viewportUpdateMode() != QGraphicsView::FullViewportUpdate) {
QRectF r(mapFromScene(m_free_rubberband).boundingRect());
r.adjust(-5, -5, 5, 5);
viewport()->update(r.toRect());
} else {
update();
}
}
m_free_rubberbanding = false;
m_free_rubberband = QPolygon();
emit freeRubberBandChanged(m_free_rubberband);
}
else
QGraphicsView::mouseReleaseEvent(e);
}
/**
@@ -909,8 +972,8 @@ bool DiagramView::event(QEvent *e) {
if (e->type() == QEvent::Gesture)
return gestureEvent(static_cast<QGestureEvent *>(e));
// fait en sorte que les raccourcis clavier arrivent prioritairement sur la
// vue plutot que de remonter vers les QMenu / QAction
// fait en sorte que les raccourcis clavier arrivent prioritairement sur la
// vue plutot que de remonter vers les QMenu / QAction
if (
e -> type() == QEvent::ShortcutOverride &&
selectedItemHasFocus()
@@ -921,6 +984,25 @@ bool DiagramView::event(QEvent *e) {
return(QGraphicsView::event(e));
}
void DiagramView::paintEvent(QPaintEvent *event)
{
QGraphicsView::paintEvent(event);
if (m_free_rubberbanding && m_free_rubberband.count() >= 3)
{
QPainter painter(viewport());
painter.setRenderHint(QPainter::Antialiasing);
QPen pen(Qt::darkGreen);
pen.setWidth(1);
painter.setPen(pen);
QColor color(Qt::darkGreen);
color.setAlpha(50);
QBrush brush(color);
painter.setBrush(brush);
painter.drawPolygon(mapFromScene(m_free_rubberband));
}
}
/**
Switch to visualisation mode if the user is pressing Ctrl and Shift.
@return true if the view was switched to visualisation mode, false