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MultiSelect: ImGuiSelectionBasicStorage: added GetNextSelectedItem() to abstract selection storage from user. Amend Assets Browser demo to handle drag and drop correctly.

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ocornut 2024-06-11 17:14:00 +02:00
parent c3d7aa252b
commit e1fd25051e
3 changed files with 61 additions and 25 deletions
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21
imgui_widgets.cpp
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@ -7821,6 +7821,23 @@ void ImGui::DebugNodeMultiSelectState(ImGuiMultiSelectState* storage)
// - ImGuiSelectionExternalStorage
//-------------------------------------------------------------------------
// GetNextSelectedItem() is an abstraction allowing us to change our underlying actual storage system without impacting user.
// (e.g. store unselected vs compact down, compact down on demand, use raw ImVector<ImGuiID> instead of ImGuiStorage...)
ImGuiID ImGuiSelectionBasicStorage::GetNextSelectedItem(void** opaque_it)
{
ImGuiStoragePair* it = (ImGuiStoragePair*)*opaque_it;
ImGuiStoragePair* it_end = _Storage.Data.Data + _Storage.Data.Size;
if (it == NULL)
it = _Storage.Data.Data;
IM_ASSERT(it >= _Storage.Data.Data && it <= it_end);
if (it != it_end)
while (it->val_i == 0 && it < it_end)
it++;
const bool has_more = (it != it_end);
*opaque_it = has_more ? (void**)(it + 1) : (void**)(it);
return has_more ? it->key : 0;
}
// Apply requests coming from BeginMultiSelect() and EndMultiSelect().
// - Enable 'Demo->Tools->Debug Log->Selection' to see selection requests as they happen.
// - Honoring SetRange requests requires that you can iterate/interpolate between RangeFirstItem and RangeLastItem.
@ -7852,7 +7869,7 @@ void ImGuiSelectionBasicStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
Clear();
if (req.Selected)
{
Storage.Data.reserve(ms_io->ItemsCount);
_Storage.Data.reserve(ms_io->ItemsCount);
for (int idx = 0; idx < ms_io->ItemsCount; idx++)
SetItemSelected(GetStorageIdFromIndex(idx), true);
}
@ -7863,6 +7880,8 @@ void ImGuiSelectionBasicStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
}
}
//-------------------------------------------------------------------------
// Apply requests coming from BeginMultiSelect() and EndMultiSelect().
// We also pull 'ms_io->ItemsCount' as passed for BeginMultiSelect() for consistency with ImGuiSelectionBasicStorage
// This makes no assumption about underlying storage.