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Nav: storing NavRect in LastItemData. Fix race condition where framed items (Rect != NavRect) calling SetFocusID() would store the wrong NavRectRel until next frame

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(haven't dugged in the possible side-effects of that race condition)
This commit is contained in:
ocornut 2021-09-01 12:07:17 +02:00
parent ee351d3548
commit a735a8c084
3 changed files with 5 additions and 3 deletions
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5
imgui.cpp
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@ -7498,6 +7498,7 @@ bool ImGui::ItemAdd(const ImRect& bb, ImGuiID id, const ImRect* nav_bb_arg, ImGu
// (DisplayRect is left untouched, made valid when ImGuiItemStatusFlags_HasDisplayRect is set)
g.LastItemData.ID = id;
g.LastItemData.Rect = bb;
g.LastItemData.NavRect = nav_bb_arg ? *nav_bb_arg : bb;
g.LastItemData.InFlags = g.CurrentItemFlags;
g.LastItemData.StatusFlags = ImGuiItemStatusFlags_None;
@ -7517,7 +7518,7 @@ bool ImGui::ItemAdd(const ImRect& bb, ImGuiID id, const ImRect* nav_bb_arg, ImGu
if (g.NavId == id || g.NavAnyRequest)
if (g.NavWindow->RootWindowForNav == window->RootWindowForNav)
if (window == g.NavWindow || ((window->Flags | g.NavWindow->Flags) & ImGuiWindowFlags_NavFlattened))
NavProcessItem(window, id, nav_bb_arg ? *nav_bb_arg : bb);
NavProcessItem(window, id, g.LastItemData.NavRect);
// [DEBUG] Item Picker tool, when enabling the "extended" version we perform the check in ItemAdd()
#ifdef IMGUI_DEBUG_TOOL_ITEM_PICKER_EX
@ -8710,7 +8711,7 @@ void ImGui::SetFocusID(ImGuiID id, ImGuiWindow* window)
g.NavFocusScopeId = window->DC.NavFocusScopeIdCurrent;
window->NavLastIds[nav_layer] = id;
if (g.LastItemData.ID == id)
window->NavRectRel[nav_layer] = ImRect(g.LastItemData.Rect.Min - window->Pos, g.LastItemData.Rect.Max - window->Pos);
window->NavRectRel[nav_layer] = ImRect(g.LastItemData.NavRect.Min - window->Pos, g.LastItemData.NavRect.Max - window->Pos);
if (g.ActiveIdSource == ImGuiInputSource_Nav)
g.NavDisableMouseHover = true;

1
imgui_internal.h
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@ -1124,6 +1124,7 @@ struct ImGuiLastItemData
ImGuiItemFlags InFlags; // See ImGuiItemFlags_
ImGuiItemStatusFlags StatusFlags; // See ImGuiItemStatusFlags_
ImRect Rect; // Full rectangle
ImRect NavRect; // Navigation scoring rectangle (not displayed)
ImRect DisplayRect; // Display rectangle (only if ImGuiItemStatusFlags_HasDisplayRect is set)
ImGuiLastItemData() { memset(this, 0, sizeof(*this)); }

2
imgui_widgets.cpp
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@ -6206,7 +6206,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
{
if (!g.NavDisableMouseHover && g.NavWindow == window && g.NavLayer == window->DC.NavLayerCurrent)
{
SetNavID(id, window->DC.NavLayerCurrent, window->DC.NavFocusScopeIdCurrent, ImRect(bb.Min - window->Pos, bb.Max - window->Pos));
SetNavID(id, window->DC.NavLayerCurrent, window->DC.NavFocusScopeIdCurrent, ImRect(bb.Min - window->Pos, bb.Max - window->Pos)); // (bb == NavRect)
g.NavDisableHighlight = true;
}
}