QML: Mouse wheel event propagation in ListView - qt

Question

Have strange situation with ListView scrolling on mouse wheel. Have Items structure similar to this:
MainAppWindow {
// Some zoomable map item
Map {
anchors.fill: parent
}
PopupMenu { // Simple Rectangle item
anchors.top: parent.top
width: 200
height: parent.height / 2
z: parent.z + 1
ListView {
anchors.fill: parent
clip: true
...
delegate: Item {
...
MouseArea {
anchors.fill: parent
onClick: {
someHandler()
}
}
}
}
}
}
ListView with vertical scroll works and scrolls just fine until it stops at bounds (top or bottom - whatever) and after this mouse event starts to propagate to underlying layer and ZoomableMap starts to zoom which is not we want: should be propagated there only if PopupMenu is not visible. Adding
onWheel: wheel.accepted = true
into MouseArea inside ListView delegate could partially solve the problem - it disables wheel and allows scrolling only by dragging the content. However better allow scrolling by the wheel as well. MouseArea in PopupMenu blocks wheel and dragging in the ListView completely as well - not helps also.
So what is problem here, how to fix? Or we doing something wrong here?

Answer 1

Need to add another MouseArea into PopupMenu which blocks all mouse events and is disabled by default and enable it only if popup is visible (optional):
enabled: popupMenu.visible
MainAppWindow {
// Some zoomable map item
Map {
id: map
anchors.fill: parent
}
PopupMenu { // Simple Rectangle item
id: popupMenu
anchors.top: parent.top
width: 200
height: parent.height / 2
z: parent.z + 1
MouseArea {
id: mapMouseArea
anchors.fill: parent
enabled: popupMenu.visible
preventStealing:true
hoverEnabled: true
onWheel: { wheel.accepted = true; }
onPressed: { mouse.accepted = true; }
onReleased: { mouse.accepted = true; }
}
ListView {
anchors.fill: parent
clip: true
...
delegate: Item {
...
MouseArea {
anchors.fill: parent
onClick: {
someHandler()
}
}
}
}
}
}
Note: however this solution does not work if ListView (or any other control) is a Map descendant item: item dragging causes map panning. To make it work need to make it at least sibling.