On Saturday, January 8, 2022 1:14:14 PM MSK Alexander Dyagilev wrote: > Hello, > > I use Loader and it seems it's not resizing to its component's size.
Hi, I'll try to answer your question.
Loader attempts to resize itself and passes through implicit sizing of its
item -- that much is true. But one important condition is that the item should
be a QQuickItem*, which QtQuick.Controls.2/Popup, unfortunately, is not a
subclass of.
Popup does have all the properties like width/height and margin/padding that
make it look like an Item, but in fact it just doesn't inherit. As sad as it
is, the Loader usecase that you found is not the only broken thing about the
popups.
===========================================================
About your code style, I'd suggest
1) using modern & shorter syntax like
> width = Qt.binding(() => item.width);
2) don't use imperative code at all, and use regular but conditional bindings
instead:
> width: item !== null ? item.width : undefined
> height: item !== null ? item.height : undefined
No matter how I tried tweaking the condition, I'm still getting (although
pretty harmless) binding loops. Currently I don't see how to avoid that, since
width and height are indeed two separate properties updated one by one.
Rather unfortunate (yet again), we can't bind Loader's implicit size manually,
because those properties are redefined internally as read-only.
> // Invalid property assignment: "implicitHeight" is a read-only property:
> // implicitWidth: item ? item.implicitWidth : 0
> // implicitHeight: item ? item.implicitHeight : 0
===========================================================
Alternative route
Just wrap your Popup inside an Item, and bind their implicit & explicit sizes
in both directions, if you wish so.
In this example I'm using sourceComponent instead of source URL, but it should
be trivial to port between both variants.
> Loader {
> id: loader
> anchors.centerIn: parent
> sourceComponent: Component {
> Item {
> id: wrapper
> implicitWidth: popup.implicitWidth
> implicitHeight: popup.implicitHeight
> MyPopup {
> id: popup
> width: wrapper.width
> height: wrapper.height
> }
> }
> }
> }
MyPopup.qml:
> import QtQuick 2.12
> import QtQuick.Controls 2.12
>
> Popup {
> modal: true
> focus: true
> visible: true
>
> implicitWidth: 200
> implicitHeight: 200
>
> Label {
> text: "TEST"
> }
> }
Note: I'm declaring implicit size on the top-level components, so they could
be reused in other code that includes them.
--
ivan (@ratijas)
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