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Implement middle mouse button panning. (#1433)

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nice, thanks!
This commit is contained in:
karliss 2019-04-07 14:02:35 +03:00 committed by Florian Märkl
parent 14c64e01f3
commit 3e645980fc
2 changed files with 22 additions and 9 deletions
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30
src/widgets/GraphView.cpp
View File

@ -133,6 +133,15 @@ QPolygonF GraphView::recalculatePolygon(QPolygonF polygon)
return ret;
}
void GraphView::beginMouseDrag(QMouseEvent *event)
{
scroll_base_x = event->x();
scroll_base_y = event->y();
scroll_mode = true;
setCursor(Qt::ClosedHandCursor);
viewport()->grabMouse();
}
void GraphView::paintEvent(QPaintEvent *)
{
#ifndef QT_NO_OPENGL
@ -352,6 +361,11 @@ bool GraphView::checkPointClicked(QPointF &point, int x, int y, bool above_y)
// Mouse events
void GraphView::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::MiddleButton) {
beginMouseDrag(event);
return;
}
int x = event->pos().x() / current_scale + offset.x();
int y = event->pos().y() / current_scale + offset.y();
@ -396,11 +410,7 @@ void GraphView::mousePressEvent(QMouseEvent *event)
// No block was clicked
if (event->button() == Qt::LeftButton) {
//Left click outside any block, enter scrolling mode
scroll_base_x = event->x();
scroll_base_y = event->y();
scroll_mode = true;
setCursor(Qt::ClosedHandCursor);
viewport()->grabMouse();
beginMouseDrag(event);
}
}
@ -442,10 +452,7 @@ void GraphView::mouseReleaseEvent(QMouseEvent *event)
// else if(event->button() == Qt::BackButton)
// gotoPreviousSlot();
if (event->button() != Qt::LeftButton)
return;
if (scroll_mode) {
if (scroll_mode && (event->buttons() & (Qt::LeftButton | Qt::MiddleButton)) == 0) {
scroll_mode = false;
setCursor(Qt::ArrowCursor);
viewport()->releaseMouse();
@ -454,6 +461,11 @@ void GraphView::mouseReleaseEvent(QMouseEvent *event)
void GraphView::wheelEvent(QWheelEvent *event)
{
if (scroll_mode) {
// With some mice it's easy to hit sideway scroll button while holding middle mouse.
// That would result in unwanted scrolling while panning.
return;
}
QPoint delta = -event->angleDelta();
delta /= current_scale;

1
src/widgets/GraphView.h
View File

@ -133,6 +133,7 @@ private:
#endif
QPolygonF recalculatePolygon(QPolygonF polygon);
void beginMouseDrag(QMouseEvent *event);
};
#endif // GRAPHVIEW_H