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- Fix an error in SwapItems where the item tops would not be swapped

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if the items were the same height.
- Modified _RecalcItemTops to allow us to specify a range instead of 
just a starting point. This is useful for cases like Swap, where 
only the items in between those being swapped need to be 
recalculated.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24139 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Rene Gollent 2008-02-26 13:27:24 +00:00
parent d6fdcf4304
commit 43948ef628
2 changed files with 15 additions and 12 deletions
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2
headers/os/interface/ListView.h
View File

@ -160,7 +160,7 @@ class BListView : public BView, public BInvoker {
bool _TryInitiateDrag(BPoint where);
int32 _CalcFirstSelected(int32 after);
int32 _CalcLastSelected(int32 before);
void _RecalcItemTops(int32 start);
void _RecalcItemTops(int32 start, int32 end = -1);
virtual void DrawItem(BListItem* item, BRect itemRect,
bool complete = false);

25
src/kits/interface/ListView.cpp
View File

@ -1531,25 +1531,24 @@ BListView::_SwapItems(int32 a, int32 b)
// track selection
// NOTE: this is only important if the selection status
// of both items is not the same
int32 first = min_c(a, b);
int32 last = max_c(a, b);
if (ItemAt(a)->IsSelected() != ItemAt(b)->IsSelected()) {
int32 first = min_c(a, b);
int32 last = max_c(a, b);
if (first < fFirstSelected || last > fLastSelected) {
first = min_c(first, fFirstSelected);
last = max_c(last, fLastSelected);
_RescanSelection(first, last);
}
if (first < fFirstSelected || last > fLastSelected)
_RescanSelection(min_c(first, fFirstSelected), min_c(last, fLastSelected));
// though the actually selected items stayed the
// same, the selection has still changed
SelectionChanged();
}
ItemAt(a)->SetTop(bFrame.top);
ItemAt(b)->SetTop(aFrame.top);
// take care of invalidation
if (Window()) {
// NOTE: window looper is assumed to be locked!
if (aFrame.Height() != bFrame.Height()) {
ItemAt(a)->SetTop(bFrame.top);
ItemAt(b)->SetTop(aFrame.top);
_RecalcItemTops(first, last);
// items in between shifted visually
Invalidate(aFrame | bFrame);
} else {
@ -1676,14 +1675,18 @@ BListView::_RescanSelection(int32 from, int32 to)
}
void
BListView::_RecalcItemTops(int32 start)
BListView::_RecalcItemTops(int32 start, int32 end)
{
int32 count = CountItems();
if ((start < 0) || (start >= count))
return;
if (end >= 0)
count = end + 1;
float top = (start == 0) ? 0.0 : ItemAt(start - 1)->Bottom() + 1.0;
for (int32 i = start; i < CountItems(); i++) {
for (int32 i = start; i < count; i++) {
BListItem *item = ItemAt(i);
item->SetTop(top);
top += ceilf(item->Height());