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fix a listbox issue occurs when resizing without adjusting item offset

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This commit is contained in:
Jinhao 2015-12-09 00:19:28 +08:00
parent 9ca02afe61
commit 2ac3b8128d
1 changed files with 34 additions and 7 deletions
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41
source/gui/widgets/listbox.cpp
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@ -2006,23 +2006,50 @@ namespace nana
void adjust_scroll_value()
{
const auto graph_size = graph->size();
if(scroll.h.empty() == false)
{
unsigned width = 4 + (scroll.v.empty() ? 0 : scroll.scale - 1);
if(width >= graph->width()) return;
scroll.h.amount(header.pixels());
scroll.h.range(graph->width() - width);
const auto ext_px = (4 + (scroll.v.empty() ? 0 : scroll.scale - 1));
if (ext_px > graph_size.width)
return;
const auto header_px = header.pixels();
const unsigned window_px = graph_size.width - (4 + (scroll.v.empty() ? 0 : scroll.scale - 1));
if (header_px < window_px + scroll.offset_x)
{
scroll.offset_x = header_px - window_px;
}
scroll.h.amount(header_px);
scroll.h.range(window_px);
scroll.h.value(scroll.offset_x);
scroll.h.step(graph->text_extent_size(L"W").width);
}
if(scroll.v.empty() == false)
{
unsigned height = 2 + (scroll.h.empty() ? 0 : scroll.scale);
if(height >= graph->height()) return;
const auto ext_px = 2 + (scroll.h.empty() ? 0 : scroll.scale);
if (ext_px >= graph_size.height)
return;
const auto items = lister.the_number_of_expanded();
const auto disp_items = number_of_lister_items(false);
size_type off = lister.distance({ 0, 0 }, scroll.offset_y_dpl);
if (items < disp_items + off)
{
index_pair pos;
if (lister.forward({ 0, 0 }, items - disp_items, pos))
{
off = items - disp_items;
set_scroll_y_dpl(pos);
}
}
scroll.v.amount(lister.the_number_of_expanded());
scroll.v.range(number_of_lister_items(false));
size_type off = lister.distance({0,0}, scroll.offset_y_dpl );
scroll.v.value(off);
}
}