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BListView: Restore selection to MouseDown and fix multi-select drag'n'drop 

* Moves list item selection logic back to MouseDown from MouseUp to improve
  application compatibility and responsiveness
* Fixes multi-select drag and drop by not modifying the existing
  selection if a MouseDown event is on a selected item.

Fixes #9190, #14264, #14289
Change-Id: I58050b403dac985f98e03faa72de1ebc5d24f95b
This commit is contained in:
David Murphy 2018-07-19 23:38:23 -04:00 committed by waddlesplash
parent bc8427c522
commit d8d6c65576
1 changed files with 18 additions and 25 deletions
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43
src/kits/interface/ListView.cpp
View File

@ -547,6 +547,11 @@ BListView::MouseDown(BPoint where)
}
int32 index = IndexOf(where);
int32 modifiers = 0;
BMessage* message = Looper()->CurrentMessage();
if (message != NULL)
message->FindInt32("modifiers", &modifiers);
// If the user double (or more) clicked within the current selection,
// we don't change the selection but invoke the selection.
@ -585,30 +590,6 @@ BListView::MouseDown(BPoint where)
&BListView::_DoneTracking, &BListView::_Track);
}
BView::MouseDown(where);
}
void
BListView::MouseUp(BPoint where)
{
if (fTrack->is_dragging) {
// do selection only if a drag was not initiated
BView::MouseUp(where);
return;
}
int32 modifiers = 0;
BMessage* message = Looper()->CurrentMessage();
if (message != NULL)
message->FindInt32("modifiers", &modifiers);
// Evaluate selection based on the selected index
// at the time of the mouse starting to track.
// Otherwise we cannot properly handle dragging and dropping
// with multi-select list.
int32 index = fTrack->item_index;
if (index >= 0) {
if (fListType == B_MULTIPLE_SELECTION_LIST) {
if ((modifiers & B_SHIFT_KEY) != 0) {
@ -627,7 +608,12 @@ BListView::MouseUp(BPoint where)
Deselect(index);
else
Select(index, true);
} else
} else if (!ItemAt(index)->IsSelected())
// To enable multi-select drag and drop, we only
// exclusively select a single item if it's not one of the
// already selected items. This behavior gives the mouse
// tracking thread the opportunity to initiate the
// multi-selection drag with all the items still selected.
Select(index);
}
} else {
@ -640,6 +626,13 @@ BListView::MouseUp(BPoint where)
} else if ((modifiers & B_COMMAND_KEY) == 0)
DeselectAll();
BView::MouseDown(where);
}
void
BListView::MouseUp(BPoint where)
{
BView::MouseUp(where);
}