void
BListView::_Track(BPoint where, uint32)
{
if (fTrack->item_index >= 0 && fTrack->try_drag) {
// initiate a drag if the mouse was moved far enough
BPoint offset = where - fTrack->drag_start;
float dragDistance = sqrtf(offset.x * offset.x + offset.y * offset.y);
if (dragDistance >= 5.0f) {
fTrack->try_drag = false;
fTrack->is_dragging = InitiateDrag(fTrack->drag_start,
fTrack->item_index, fTrack->was_selected);
}
}
if (!fTrack->is_dragging) {
// do selection only if a drag was not initiated
int32 index = IndexOf(where);
BListItem* item = ItemAt(index);
if (item != NULL && !item->IsSelected() && item->IsEnabled()) {
Select(index, fListType == B_MULTIPLE_SELECTION_LIST
&& (modifiers() & B_SHIFT_KEY) != 0);
ScrollToSelection();
}
}
}
void
BListView::MouseMoved(BPoint where, uint32 code, const BMessage* dragMessage)
{
if (fTrack->item_index == -1 || !fTrack->try_drag) {
// mouse was not clicked above any item
// or no mouse button pressed
return;
}
// Initiate a drag if the mouse was moved far enough
BPoint offset = where - fTrack->drag_start;
float dragDistance = sqrtf(offset.x * offset.x + offset.y * offset.y);
if (dragDistance >= 5.0f) {
fTrack->try_drag = false;
InitiateDrag(fTrack->drag_start, fTrack->item_index,
fTrack->was_selected);
}
}
void
DataView::MouseDown(BPoint where)
{
MakeFocus(true);
BMessage *message = Looper()->CurrentMessage();
int32 buttons;
if (message == NULL || message->FindInt32("buttons", &buttons) != B_OK)
return;
view_focus newFocus;
int32 position = PositionAt(kNoFocus, where, &newFocus);
if ((buttons & B_SECONDARY_MOUSE_BUTTON) != 0
&& position >= fStart && position <= fEnd) {
InitiateDrag(newFocus);
return;
}
if ((buttons & B_PRIMARY_MOUSE_BUTTON) == 0)
return;
int32 modifiers = message->FindInt32("modifiers");
fMouseSelectionStart = position;
if (fMouseSelectionStart == -1) {
// "where" is outside the valid frame
return;
}
int32 selectionEnd = fMouseSelectionStart;
if (modifiers & B_SHIFT_KEY) {
// enlarge the current selection
if (fStart < selectionEnd)
fMouseSelectionStart = fStart;
else if (fEnd > selectionEnd)
fMouseSelectionStart = fEnd;
}
SetSelection(fMouseSelectionStart, selectionEnd, newFocus);
SetMouseEventMask(B_POINTER_EVENTS,
B_NO_POINTER_HISTORY | B_SUSPEND_VIEW_FOCUS | B_LOCK_WINDOW_FOCUS);
}
