Slider is not a type

kgregory

I just updated Qt creator to 4.11.1 and installed QtQuick 5.14.1. It was probably a year out of date before that (not sure which version exactly) but I was using QtQuick 5.12. I use the Slider QML type quite a bit in my project and since updating, I get the error at runtime "Slider is not a type" when I try to load any page that uses it. This code worked fine just before the update.

Below is an example of one instance where I'm using it along with my import statements. Any ideas on what happened?

import QtQuick 2.12
import QtQuick.Dialogs 1.2
import QtQuick.Controls 2.14

Slider {
    id: compositeIntervalSet
    height: parent.height
    width: parent.width
    anchors.verticalCenter: parent.verticalCenter
    anchors.horizontalCenter: parent.horizontalCenter
    from: 
    to: 255
    stepSize: 1
    snapMode: Slider.SnapOnRelease
    Component.onCompleted: {
        compositeIntervalSet.value = myClass.composite.timeLimit
        myClass.composite.timeLimit = Qt.binding(function() { return compositeIntervalSet.value })
    }
    handle: Rectangle {
        x: parent.leftPadding + parent.visualPosition * (parent.availableWidth - width)
        y: parent.topPadding + parent.availableHeight / 2 - height / 2
        implicitWidth: parent.height*.8
        implicitHeight: parent.height*.8
        radius: parent.height*.4
        color: parent.pressed ? "#480090" : "#000000"
        border.color: "#ffffff"
        border.width: 4
        Image {
            anchors.fill: parent
            anchors.margins: 0.15*parent.width
            source: "SpeedIcon.png"
            sourceSize.height: 128
            sourceSize.width: 128
        }
    }
}

AndyS

The snippet misses a setting for from, but I don't think that is causing the problem since it would give a different error message then. It works fine for me locally, so it might be something that Slider depends on that is missing somehow. Can you provide the full error you get as there is sometimes some more lines in the run up indicating why Slider could not be found.

kgregory

Here is a larger snip including the Item to which the Slider is a member.

The full error is qrc:/home.qml:778:9: Slider is not a type. Line 778 is the first line that declares the Slider object.

Item {
    id: compositeInterval
    height: begin.portrait ? .06*begin.height : .10*begin.height
    width: begin.portrait ? .91 * begin.width - 0.16*begin.height : (myClass.targetDevice.quickSwitches ? .80 * begin.width - 0.32*begin.height : .91 * begin.width - 0.32*begin.height)
    anchors.verticalCenter: compositeStart.verticalCenter
    anchors.left: compositeSave.right
    anchors.leftMargin: begin.portrait ? .02*begin.width : .01*begin.width
    visible: myClass.composite.length > 0
    Text {
        id: compositeIntervalTime
        font.pixelSize: 0.2 * compositeInterval.height
        text: myClass.composite.timeLimitString
        font.family: "Helvetica"
        anchors.top: parent.top
        anchors.left: parent.left
        color: "#FFFFFF"
    }
    Text {
        id: compositeIntervalLabel
        font.pixelSize: 0.2*compositeInterval.height
        text: "Switch Interval"
        font.family: "Helvetica"
        anchors.top: parent.top
        anchors.right: parent.right
        color: "#FFFFFF"
    }
    Slider {
        id: compositeIntervalSet
        height: parent.height
        width: parent.width
        anchors.verticalCenter: parent.verticalCenter
        anchors.horizontalCenter: parent.horizontalCenter
        from: 0
        to: 255
        stepSize: 1
        snapMode: Slider.SnapOnRelease
        Component.onCompleted: {
            compositeIntervalSet.value = myClass.composite.timeLimit
            myClass.composite.timeLimit = Qt.binding(function() { return compositeIntervalSet.value })
        }
        handle: Rectangle {
            x: parent.leftPadding + parent.visualPosition * (parent.availableWidth - width)
            y: parent.topPadding + parent.availableHeight / 2 - height / 2
            implicitWidth: parent.height*.8
            implicitHeight: parent.height*.8
            radius: parent.height*.4
            color: parent.pressed ? "#480090" : "#000000"
            border.color: "#ffffff"
            border.width: 4
            Image {
                anchors.fill: parent
                anchors.margins: 0.15*parent.width
                source: "SpeedIcon.png"
                sourceSize.height: 128
                sourceSize.width: 128
            }
        }
    }
}

AndyS

@kgregory said in Slider is not a type:

Here is a larger snip including the Item to which the Slider is a member.

The full error is qrc:/home.qml:778:9: Slider is not a type. Line 778 is the first line that declares the Slider object.

Is there no lines before or after it? Sometimes its due to the fact that something Slider uses is not found, as opposed to Slider itself. Can you use Slider in a standalone example or does that fail too?

kgregory

There are 870 lines in this file, this is near the end of it. What do you mean by stand alone?

I'm using pageloader to load different pages. Any of the ones that I use Slider in fail to load with this error. Perhaps it's something I'm doing consistently across the board, like customizing the handle?

kgregory

So I tried switching back to Qt 5.12.0. I had to import QtQuick.Controls 2.12 instead of 2.14 in order to do so. Once I did that it, I don't have this issue again. I also tried Qt 5.14.1 with QtQuick.Controls 2.12 and that has the problem.

I tried commenting out various parts of the Slider code and things around it to see if I could fix it. All of my pages that have slider (most of them) have his problem. One of my pages has a problem with a type other than slider. I can't tell what the two have in common.

Anyway, I'm ok with continuing to use Qt 5.12.0, there isn't a particular reason why I need to use Qt 5.15.1 right now.

AndyS

@kgregory said in Slider is not a type:

There are 870 lines in this file, this is near the end of it. What do you mean by stand alone?

I'm using pageloader to load different pages. Any of the ones that I use Slider in fail to load with this error. Perhaps it's something I'm doing consistently across the board, like customizing the handle?

I meant if you make a small example that just uses Slider does it fail then, I used your snippet and it worked for me so I don't know why it is not working for you.

BlueCyCollins

@kgregory I had exactly the same problem (with many different types) moving from 5.7 to 5.15 AND the same solution (to "downgrade" the import to statement from say, "QtQtuick.Controls 2.2" to "QtQuick.Controls 2.15"). I'm concerned that the solution is more specific, because it just seems weird. Unfortunately the QML I'm migrating was written by a real QML expert, and I'm having trouble knowing with confidence that I'm understanding all the subtleties involved. Here's an example:

import QtQuick 2.7
import QtQuick.Controls 2.2 as QtControls
import bacon 1.0
import bacon.controls 2.0
import bacon.theme 1.0

QtControls.ScrollView {
  id: root

  property bool frameVisible: false

  property alias vertical: vbar
  property alias horizontal: hbar

  clip: true
  padding: root.frameVisible ? Theme.getMetric('scrollbar-frame-breadth') : 0

  background: Rectangle {
    border {
      color: Theme.getColor(root.activeFocus ? 'accent' : 'secondary')
      width: root.padding
    }
    color: 'transparent'
  }

  QtControls.ScrollBar.vertical: ScrollBar {
    id: vbar
    parent: root
    x: root.mirrored ? root.rightPadding : root.width - width - root.rightPadding
    y: root.topPadding
    height: root.availableHeight
    active: hbar.active
    minimumSize: Theme.getMetric('scrollbar-minimum-height') / availableHeight
  }

  QtControls.ScrollBar.horizontal: ScrollBar {
    id: hbar
    parent: root
    x: root.leftPadding
    y: root.height - height - root.bottomPadding
    width: root.availableWidth - (vbar.visible ? vbar.width : 0)
    active: vbar.active
    minimumSize: Theme.getMetric('scrollbar-minimum-width') / availableWidth
  }
}

The problem is that the line number of the error refers to the alias above, which includes two references to "ScrollBar" (the thing the error says is not a type). Fortunately includes the column which includes, which suggests that it is the second reference. Anyway, like you, it makes me nervous to simply change the import from 2.2 to 2.15 even if in some cases it fixes the problem. One possibility is that the QML has never been technically correct, but that older QML compiler was more tolerant of some error and importing the import QtQuick.Controls 2.2 directive implies a more strict language policy. @AndyS My example is the whole file, but of course it doesn't include all the customization that went into our control versions. There really is an issue here.