For what it's worth, emitting `modelReset` from the model does seem to reset the corruption, but then you loose any view state, scroll positions, etc.
> On May 9, 2020, at 5:50 PM, Patrick Stinson <patrickk...@gmail.com> wrote: > > I found a rather serious bug where TableView.contentX and TableView.contentY > gets corrupted when you hide and reshow columns or rows (bug report here: > https://bugreports.qt.io/browse/QTBUG-82535 > <https://bugreports.qt.io/browse/QTBUG-82535>). I'm looking for a workaround > since this makes it impossible to use overlay items. > > Resizing the width of a TableView with columnWidthProvider results in the > contentX property having the wrong value. The following video demonstrate how > the red rectangle, which has a fixed x of zero, jumps to the right as you > resize the table view: > > https://youtu.be/9YEaoTUR4Eo <https://youtu.be/9YEaoTUR4Eo> > > > import QtQuick 2.14 > import QtQml.Models 2.14 > import Qt.labs.qmlmodels 1.0 > > > TableView { > id: table > > Timer { > // Just resize the table twice on init to programatically reproduce > the bug. > // comment this entire item out to reproduce the bug with manual > window resizing. > id: timer > interval: 1 > running: true > repeat: true > property int count: 0 > onTriggered: { > if(count == 0){ > table.width = 400 > } else if(count == 2) { > timer.running = false > } > count++ > } > } > > // This "overlay" element doesn't stay put as it should since `x` is > always zero. > // > https://doc.qt.io/qt-5/qml-qtquick-tableview.html#overlays-and-underlays > <https://doc.qt.io/qt-5/qml-qtquick-tableview.html#overlays-and-underlays> > Rectangle { > width: 20 > height: table.contentHeight > color: 'red' > } > > onWidthChanged: { > table.forceLayout() > print('contentX', contentX) // shows that contextX does not match > what is displayed. > } > > // Bug happens when a zero-width column changes to a positive-width > column. > // So expand the table from less than 200 width to greater than 200 width > to corrupt contentX. > columnWidthProvider: function(col) { > if(table.width > 200) { > return 40 > } else { > return col % 2 == 0 ? 0 : 60 // change the `0` width to `1` and > the bug doesn't happen > } > } > > delegate: Rectangle { > implicitHeight: 30 > border { > width: 1 > } > Text { text: display } > } > > model: TableModel { > TableModelColumn { display: 'col_1' } > TableModelColumn { display: 'col_2' } > rows: [ > { col_1: 'cell 1', col_2: 'cell 1' }, > ] > } > } > >
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