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Fix crashing bug in selection management

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The fix for Shift+F3 required briefly switching the code list view
to single-select mode.  Unfortunately, while in that mode the
control throws an exception if you touch SelectedItems (plural)
rather than SelectedItem (singular), and in an unusual case the
selection-changed event handler was doing just that.
This commit is contained in:
Andy McFadden 2019-10-29 17:52:59 -07:00
parent e79064709c
commit 7000a5094e
1 changed files with 22 additions and 3 deletions
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25
SourceGen/WpfGui/MainWindow.xaml.cs
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@ -715,6 +715,16 @@ namespace SourceGen.WpfGui {
// We work around this by temporarily switching to single-select mode.
//
// This could cause problems if we wanted to select multiple single lines.
//
// NOTE: this causes a selection-changed event, which can cause problems
// if something tries to fiddle with SelectedItems (you can only do that
// when in multi-select mode) instead of SelectedItem. I tried to mitigate this
// by setting the selection twice, once in multi-select mode, so that the
// selection is unlikely to change, but that restored the Shift+F3 problem.
//
// (To repro problem: double-clicking a line in the message log about
// a reference to a non-existent symbol associated with a self-referential line
// blows things up... see test 2010.)
codeListView.SelectionMode = SelectionMode.Single;
codeListView.SelectedItem = CodeDisplayList[start];
codeListView.SelectionMode = SelectionMode.Extended;
@ -908,12 +918,21 @@ namespace SourceGen.WpfGui {
/// <param name="newParts">Replacement parts.</param>
private void CodeListView_ReplaceEntry(int index, DisplayList.FormattedParts newParts) {
bool isSelected = CodeDisplayList.SelectedIndices[index];
if (isSelected) {
codeListView.SelectedItems.Remove(CodeDisplayList[index]);
if (isSelected && codeListView.SelectionMode != SelectionMode.Single) {
if (codeListView.SelectionMode != SelectionMode.Single) {
Debug.WriteLine("HEY: hit unhappy single-select case");
codeListView.SelectedIndex = -1;
} else {
codeListView.SelectedItems.Remove(CodeDisplayList[index]);
}
}
CodeDisplayList[index] = newParts;
if (isSelected) {
codeListView.SelectedItems.Add(newParts);
if (codeListView.SelectionMode == SelectionMode.Single) {
codeListView.SelectedIndex = index;
} else {
codeListView.SelectedItems.Add(newParts);
}
}
}