Add AreRowGroupsInitiallyCollapsed for opt-in start-collapsed row groups#242
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FoxCouncil wants to merge 2 commits into
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Add AreRowGroupsInitiallyCollapsed for opt-in start-collapsed row groups#242FoxCouncil wants to merge 2 commits into
FoxCouncil wants to merge 2 commits into
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Adds an opt-in
AreRowGroupsInitiallyCollapsedproperty (defaultfalse) so a grouped DataGrid can start with its row groups collapsed.The only existing way to collapse a group is
CollapseRowGroup, which needs a realized header and runs after layout, so the expanded rows show for one frame before they collapse. This seeds the collapsed state while the row groups are generated instead: the groups start hidden, their child slots are added to the collapsed slots table, and they are excluded from the visible slot count. The first layout is already collapsed and the scroll extent is correct.When
false(the default), behavior is unchanged.Relates to #46.