Hello Federico,
thank to point where the problem appear.
It seems a nasty bug.
However, I cannot solve it using Layouts because I’m not comfortable on using
Layouts. I prefer to use anchors.
In any case, I solved the problem.
In fact, the delegate Item has the width set has the parent.width (that it is
the ListView behaving oddly).
When I removed this binding, the odd behavior disappeared and I can constraint
the width and the height as I want (and I prefer :-) )
Thanks,
Gianluca.
Il giorno 06/apr/2015, alle ore 18:28, Federico Buti <bacaro...@gmail.com> ha
scritto:
> Hi Gianluca,
> it's hard to say if it is a bug or not. The problem is anyway related to the
> sizing of the list, i.e. if you set listHistory.width to
>
> width: parent.width
>
> the problem disappears. If you set a similar constraint for the height and
> set the ListView to the vertical layout the same, odd, behaviour occurs.
>
> Instead of using such constraints, what about using a layout to size your
> three elements? Something involving a RowLayout, for instance, works
> perfectly. See the modified code below:
>
> import QtQuick 2.4
> import QtQuick.Window 2.2
> import QtQuick.Layouts 1.1
>
> Window {
> visible: true
> width: 400
> height: 400
>
> RowLayout {
> anchors.fill: parent
>
> Item {
> id: previous
> Layout.preferredWidth: parent.width / 3
> Layout.fillHeight: true
> }
>
> ListView {
> id: listHistory
> Layout.preferredWidth: parent.width / 3
> Layout.fillHeight: true
> clip: true
> orientation: ListView.Horizontal
> snapMode: ListView.SnapToItem
> highlightRangeMode: ListView.StrictlyEnforceRange
> onCurrentIndexChanged: console.log( "Current Index:
> "+currentIndex )
> model: modelHistory
> delegate: Item {
> width: listHistory.width
> height: listHistory.height
> Text {
> width: parent.width
> anchors.bottom: parent.verticalCenter
>
> font.pixelSize: 20 //* mm
> minimumPixelSize: 10 //* mm
> fontSizeMode: Text.Fit
> horizontalAlignment: Text.AlignHCenter
> text: year
> }
> Text {
>
> width: parent.width
> height: parent.height/2-1.5 //* mm
> anchors.bottom: parent.bottom
> font.pixelSize: 20 //* mm
> minimumPixelSize: 10 //* mm
> fontSizeMode: Text.Fit
> horizontalAlignment: Text.AlignHCenter
> wrapMode: Text.Wrap
> text: what
> }
> }
> }
>
> Item {
> id: next
> Layout.preferredWidth: parent.width / 3
> Layout.fillHeight: true
> }
> }
> }
>
> Cheers,
> F.
>
> ---
> Federico Buti
>
> On 6 April 2015 at 11:15, Gianluca <gmax...@gmail.com> wrote:
> Dear all,
> I’m experiencing a unexpected behavior:
> I have a ListView in QML that display data from a ListModel.
> The dimension of ListView is set in such a way that only one element delegate
> is display at time.
> When I configure the ListView to be Vertical, then the first item displayed
> is the first item on the ListModel.
> But when I configure the ListView to be Horizontal, then the first item
> displayed is not the first item on the ListModel … but one in the middle.
> Why ??
> Forcing the property currentIndex to 0 do not solve the problem.
> Calling positionViewAtBeginning do not solve the problem :-(
>
> What else I can do ?
>
> // Code of ListView:
> ListView {
> id: listHistory
> anchors.centerIn: parent
> height: parent.height
> width: parent.width-previous.width-next.width
> clip: true
> orientation: ListView.Horizontal
> snapMode: ListView.SnapToItem
> highlightRangeMode: ListView.StrictlyEnforceRange
> onCurrentIndexChanged: console.log( "Current Index:
> "+currentIndex )
> model: modelHistory
> delegate: Item {
> width: listHistory.width
> height: listHistory.height
> Text {
> width: parent.width
> anchors.bottom: parent.verticalCenter
> color: "white"
> font.pixelSize: 8.5*mm
> minimumPixelSize: 4*mm
> fontSizeMode: Text.Fit
> horizontalAlignment: Text.AlignHCenter
> text: year
> }
> Text {
> color: "white"
> width: parent.width
> height: parent.height/2-1.5*mm
> anchors.bottom: parent.bottom
> font.pixelSize: 2.4*mm
> minimumPixelSize: 1*mm
> fontSizeMode: Text.Fit
> horizontalAlignment: Text.AlignHCenter
> wrapMode: Text.Wrap
> text: what
> }
> }
> }
>
> // On the console I get the following message:
> qml: Current Index: 0
> qml: Current Index: 19
>
> But Who change the current index to 19 ??
>
> Thanks,
> Gianluca.
>
>
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