How to get QML (5.15) to understand that when I declare a property to be an integer, I WANT it to be treated as an INTEGER, and NOT a FUNCTION!

VFCraig

QML 5.15

I have a control. It allows a value to be incremented or decremented by a specified amount.
The display can only hold up to 3 digits, so it must be less than 1000.

The user can specify an adjustment value, adjustmentDelta, which defaults to 50.

For those that need code to understand how that translates,

property int adjustmentDelta: 50

The minimum value is zero, the maximum is set to, (1000 - adjustmentDelta). Again, for those that require rudimentary code,

property int theMinValue: 0
property int theMaxValue: (1000 - adjustmentDelta)

(And, honestly, give us a way to define LOCAL properties that are NOT visible outside the class WITHOUT creating a QtObject! Far too many hacks in QML to do basics.)

When I attempt to test values to then show a message block that indicates if the minimum or maximum has been reached, it fails a simple boolean check, if (thValue >= theMaxValue), because it is treating, theMaxValue, as a function.

The values have not changed within the module once theMaxValue was set. adjustmentDelta is still the same and 1000 is still the same. Even a function of such simplicity should return the same value consistently.

Yes, I could write a ridiculously simple and wasteful function to return (1000 - adjustmentDelta) and assign theMaxValue to that return value, but again, just another way of hacking around QML.

Once more, theMaxValue is a property defined as an integer. Let me use it as an INTEGER!

IntruderExcluder

Really didn't get your problem. The code below works fine:

    property int adjust: 50
    property int min: 0
    property int max: (1000 - adjust)
    property int current: 99942

    Button {
        anchors.centerIn: parent
        text: "Test"
        onClicked: {
            console.log(adjust, min, max, current, current >= max)
            console.log(typeof max)
        }
    }

Output:

qml: 50 0 950 99942 true
qml: number

VFCraig

Result from the following:

print("\nHighPressureLimit: increase - (theValue => theMaxValue)="+(theValue => theMaxValue).toString()+", (theValue <= theMinValue)="+(theValue <= theMinValue).toString()+"\n")

is,

HighPressureLimit: increase - (theValue => theMaxValue)=function() { [native code] }, (theValue <= theMinValue)=false

It's a BOOLEAN expression! Even if it contains a function, it should still result in true or false. (As the test of the min value obviously does.)

IntruderExcluder

This is not an property feature, nor a QML feature. The same effects you can achieve with code below:

            let variable;
            console.log((variable => 42))

This is how V4 engine and JavaScript works. But I think you just messed with syntax, cuz => isn't an comparison, it is new arrow function syntax. Just use >= instead, and there is no need to convert to string. E.g.:

console.log("3 >= 5: " + (3 >= 5))

VFCraig

The following...

print("HighPressureLimit: increase - typeof theMaxValue = "+typeof theMaxValue+"\n")
print("HighPressureLimit: increase - typeof theMinValue = "+typeof theMinValue+"\n")
print("HighPressureLimit: increase - typeof theValue = "+typeof theValue+"\n")
print("HighPressureLimit: increase - typeof (theValue => theMaxValue) = "+typeof (theValue => theMaxValue)+"\n")
print("HighPressureLimit: increase - typeof (theValue <= theMinValue) = "+typeof (theValue <= theMinValue)+"\n")

Results in...

qml: HighPressureLimit: increase - typeof theMaxValue = number
qml: HighPressureLimit: increase - typeof theMinValue = number
qml: HighPressureLimit: increase - typeof theValue = number
qml: HighPressureLimit: increase - typeof (theValue => theMaxValue) = function <- NOTE: This is NOT what I want.
qml: HighPressureLimit: increase - typeof (theValue <= theMinValue) = boolean

VFCraig

The issue was => vs >=.

Very frustrating. Would love to be creating this GUI in C++ instead.

Thanks for the response, IntruderExcluder.

GrecKo

=> isn't valid c++ either.