How disable drag of points in the x axis on chartview - qt

Question

I have a qtchart with a lineseries with 5 points on the graph. I can drag these points on in both x and y axis inside min and max of axisX and axisY.
How can disable drag of points in the x axis? so it is possible to drag points vertically on the chart. Here is my code:
ChartView {
id: chart
property var selectedPoint: undefined
anchors.fill: parent
antialiasing: true
property real toleranceX: 0.05
property real toleranceY: 0.05
ValueAxis {
id: axisX
min: 0
max: 5
}
ValueAxis {
id: axisY
min: -10
max: 10
}
LineSeries {
id: series1
axisX: axisX
axisY: axisY
pointsVisible: true
}
MouseArea {
anchors.fill: parent
onPressed:
{
var cp = chart.mapToValue(Qt.point(mouse.x,mouse.y));
for(var i = 0;i < series1.count;i ++)
{
var p = series1.at(i);
if(Math.abs(cp.x - p.x) <= chart.toleranceX && Math.abs(cp.y - p.y) <= chart.toleranceY)
{
chart.selectedPoint = p;
break;
}
}
}
onPositionChanged: {
if(chart.selectedPoint != undefined) {
var p = Qt.point(mouse.x, mouse.y);
var cp = chart.mapToValue(p);
if(cp.x >= axisX.min && cp.x <= axisX.max && cp.y >= axisY.min && cp.y <= axisY.max) {
series1.replace(chart.selectedPoint.x, chart.selectedPoint.y, cp.x, cp.y);
chart.selectedPoint = cp;
}
}
}
onReleased: {
chart.selectedPoint = undefined;
}
}
}
// Add data to the series
Component.onCompleted: {
for (var i = 0; i <= 5; i++) {
series1.append(i, Math.random());
}
}
So far I could disable drag on x axis for one point in this case point on 3 by changing onPositionChanged to following code but there are two problems, first this is just one point, second, it does not disable the drag completely instead the point can be dragged on x axis between 2 to 4 but it cannot be dragged outside this range.
onPositionChanged: {
if(chart.selectedPoint != undefined) {
var p = Qt.point(mouse.x, mouse.y);
var cp = chart.mapToValue(p);
if(cp.x >= axisX.min && cp.x <= axisX.max && cp.y >= axisY.min && cp.y <= axisY.max) {
if (Math.round(cp.x) == 3){
series1.replace(chart.selectedPoint.x, chart.selectedPoint.y, cp.x, cp.y);
chart.selectedPoint = cp;
}
}
}
}