[Interest] Can QML model specify a range including negative numbers? For example -180 to +180 ?

[Curtis Mitch]

You can use the columnForeground component [1] for this purpose:

import QtQuick 2.3
import QtQuick.Controls 1.2
import QtQuick.Extras 1.2
import QtQuick.Controls.Styles 1.2

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Tumbler {
        id: tumbler
        anchors.centerIn: parent

        TumblerColumn {
            model: 90
        }
        TumblerColumn {
            model: 60
        }
        TumblerColumn {
            model: 60
        }
        TumblerColumn {
            model: ["N", "S"]
        }

        property var columnTitles: ["Degrees", "Minutes", "Seconds", "North/South"]

        style: TumblerStyle {
            columnForeground: Item {
                Text {
                    text: tumbler.columnTitles[styleData.column]
                    anchors.horizontalCenter: parent.horizontalCenter
                    anchors.bottom: parent.top
                    anchors.bottomMargin: height
                }
            }
        }
    }
}

Note that there is a limitation [2] that affects your current usage of Tumbler:

"For technical reasons, the model count must be equal to or greater than visibleItemCount plus one."

You might want to consider using a Switch for the North/South option.

By the way, is this UI for a touch device?

[1] http://doc.qt.io/qt-5/qml-qtquick-controls-styles-tumblerstyle.html#columnForeground-prop
[2]  http://doc.qt.io/qt-5/qml-qtquick-extras-tumbler.html#limitations

From: Interest [mailto:interest-bounces at qt-project.org] On Behalf Of Edward Sutton
Sent: Thursday, 5 November 2015 4:25 PM
To: André Somers <andre at familiesomers.nl>
Cc: interest at qt-project.org
Subject: Re: [Interest] Can QML model specify a range including negative numbers? For example -180 to +180 ?

Never mind, the answer is TumblerStyle<http://doc.qt.io/qt-5/qml-qtquick-controls-styles-tumblerstyle.html>.

http://doc.qt.io/qt-5/qtquick-controls-styles-qmlmodule.html

Is it possible to add column headers to a Qt 5.5  TumblerColumn<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html>?

Degrees  Minutes Seconds

I need to learn how to compose a QML UI consisting of multiple components, text and other wise.

-Ed

[cid:image001.png at 01D1187B.59C4F8A0]


On Nov 5, 2015, at 9:14 AM, Edward Sutton <edward.sutton at subsite.com<mailto:edward.sutton at subsite.com>> wrote:


On Nov 5, 2015, at 8:34 AM, André Somers <andre at familiesomers.nl<mailto:andre at familiesomers.nl>> wrote:

Op 4-11-2015 om 18:27 schreef Edward Sutton:

<Mail Attachment.png>



I would set the number of items visible on the spinner columns to something higher than 3 for this application though. 5 or 7 would look nicer I think.


Good advice!  How do you configure number of items visible?

I am using Qt 5.5 commercial.  I cannot find a property that sounds like it controls the number of visible items on the wheel?

http://doc.qt.io/qt-5/qml-qtquick-extras-tumbler.html
http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html
Properties
·         activeFocus<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#activeFocus-prop> : bool
·         columnForeground<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#columnForeground-prop> : Component
·         currentIndex<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#currentIndex-prop> : int
·         delegate<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#delegate-prop> : Component
·         highlight<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#highlight-prop> : Component
·         model<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#model-prop> : var
·         role<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#role-prop> : string
·         visible<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#visible-prop> : bool
·         width<http://doc.qt.io/qt-5/qml-qtquick-extras-tumblercolumn.html#width-prop> : real
With QML in general, I do not understand how you learn what QML component signals and properties are available on a component and what is configurable and what is not.

QML seems similar to Qt3D - you must read a lot of examples and do a lot of trial and error experimenting.  I must be missing something?

-Ed




André
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