how to set the scrollbar position to max? its not 1.0 as stated in the docs

user_951272 0
Viewed 366

UPDATE

Fixed by calculating the needed position using the max content.x position and a 0.0-1.0 factor

Component.onCompleted:
{
    var maxContentX = content.width - frame.width
    var factor = 1.0 // 0, 0.5, 1.0
    var newPosition = (maxContentX*factor)/content.width
    hbar.position = newPosition
}

Qt-Docs: ScrollBar QML Type

Position Property

This property holds the position of the scroll bar, scaled to 0.0 - 1.0.

but the position never reaches 1.0 - because the position only holds 1 minus bar size

  • i don't understand whats the sense is of scaling the position between 0 and 1 but then make it directly related to bar size
  • are there any meaningful usages for position values above (1 minus bar-size)?
  • is there a way to get the bar size?

enter image description here

any idea how to calculate the correct mid/max values for the position? i want to build a timer that toggles between 0%, 50% and 100% position

Qt-Sample: Non-attached Scroll Bars

import QtQuick 2.15
import QtQuick.Controls 2.15

Item
{
  height: 300
  width: 300
  
  Column
  {
    Text { text: "vbar.position: "+vbar.position }
    Text { text: "hbar.position: "+hbar.position }
  }

Rectangle {
    id: frame
    clip: true
    width: 160
    height: 160
    border.color: "black"
    anchors.centerIn: parent  

    Text {
        id: content
        text: "ABC"
        font.pixelSize: 160
        x: -hbar.position * width
        y: -vbar.position * height
    }

    ScrollBar {
        id: vbar
        hoverEnabled: true
        active: hovered || pressed
        orientation: Qt.Vertical
        size: frame.height / content.height
        anchors.top: parent.top
        anchors.right: parent.right
        anchors.bottom: parent.bottom
    }

    ScrollBar {
        id: hbar
        hoverEnabled: true
        active: hovered || pressed
        orientation: Qt.Horizontal
        size: frame.width / content.width
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.bottom: parent.bottom
    }
}

}
qml scrollbar
1 Answers

I don't think I can answer the "why" part of your question. But to get the bar size, I believe you can use the Scrollbar's contentItem property. To get 0%, 50%, and 100%, you could probably do something like this (for a horizontal scrollbar):

// 0%
position: 0
// 50%
position: (width - contentItem.width) / width / 2
// 100%
position: (width - contentItem.width) / width
user_74271520
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