https://bugs.kde.org/show_bug.cgi?id=480594
--- Comment #15 from fanzhuyi...@gmail.com ---
The general problem seems to be that scrollviews cannot correctly handle items
that dynamically resize based on their index...
Here is a more extreme example where the topPadding is a function of index:
(type 123 into the search and you can see the problem)
```
import QtQuick
import QtQuick.Layouts
import QtQuick.Controls
import mysearch
Window {
width: 640
height: 480
visible: true
title: qsTr("Hello World")
ListModel {
id: listModel
}
Component.onCompleted: {
for (var i = 0; i < 1000; i++) {
listModel.append({display: "Item " + i})
}
}
// Column layout
ColumnLayout {
anchors.fill: parent
// search box
TextField {
id: searchBox
Layout.fillWidth: true
Layout.fillHeight: false
placeholderText: "Search"
}
ScrollView {
Layout.fillWidth: true
Layout.fillHeight: true
ListView {
id: listView
// Layout.fillWidth: true
// Layout.fillHeight: true
model: CustomProxyModel {
sourceModel: listModel
filter: searchBox.text
}
clip: true
delegate: ItemDelegate {
id: controlRoot
text: model.display
width: listView.width
topPadding: (index % 10) * 10
}
}
}
}
}
```
and
```
#pragma once
#include <QSortFilterProxyModel>
#include <QtQml/qqmlregistration.h>
class CustomProxyModel : public QSortFilterProxyModel {
Q_OBJECT
QML_ELEMENT
Q_PROPERTY(QString filter READ filter WRITE setFilter NOTIFY filterChanged)
public:
CustomProxyModel(QObject *parent = nullptr)
: QSortFilterProxyModel(parent) {}
QString filter() const { return m_matchString; }
void setFilter(const QString &s) {
if (m_matchString == s)
return;
m_matchString = s;
invalidateFilter();
}
bool filterAcceptsRow(int sourceRow,
const QModelIndex &sourceParent) const override {
const auto index = sourceModel()->index(sourceRow, 0, sourceParent);
if (!index.isValid())
return false;
const auto &str = index.data().value<QString>();
bool accepted = str.contains(m_matchString);
return accepted;
}
Q_SIGNALS:
void filterChanged();
private:
QString m_matchString;
};
```
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