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Internals: Added context hook removal support (#3580, #3626, #3753)

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This commit is contained in:
Sammy Fatnassi
2021-01-26 15:14:56 +01:00
committed by ocornut
parent f139846750
commit f3f2578e8f
2 changed files with 25 additions and 4 deletions
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22
imgui.cpp
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@ -3346,11 +3346,23 @@ void ImGui::DestroyContext(ImGuiContext* ctx)
}
// No specific ordering/dependency support, will see as needed
void ImGui::AddContextHook(ImGuiContext* ctx, const ImGuiContextHook* hook)
ImGuiID ImGui::AddContextHook(ImGuiContext* ctx, const ImGuiContextHook* hook)
{
ImGuiContext& g = *ctx;
IM_ASSERT(hook->Callback != NULL);
IM_ASSERT(hook->Callback != NULL && hook->HookId == 0 && hook->Type != ImGuiContextHookType_PendingRemoval_);
g.Hooks.push_back(*hook);
g.Hooks.back().HookId = ++g.HookIdNext;
return g.HookIdNext;
}
// Deferred removal, avoiding issue with changing vector while iterating it
void ImGui::RemoveContextHook(ImGuiContext* ctx, ImGuiID hook_id)
{
ImGuiContext& g = *ctx;
IM_ASSERT(hook_id != 0);
for (int n = 0; n < g.Hooks.Size; n++)
if (g.Hooks[n].HookId == hook_id)
g.Hooks[n].Type = ImGuiContextHookType_PendingRemoval_;
}
// Call context hooks (used by e.g. test engine)
@ -3780,6 +3792,12 @@ void ImGui::NewFrame()
{
IM_ASSERT(GImGui != NULL && "No current context. Did you call ImGui::CreateContext() and ImGui::SetCurrentContext() ?");
ImGuiContext& g = *GImGui;
// Remove pending delete hooks before frame start.
// This deferred removal avoid issues of removal while iterating the hook vector
for (int n = g.Hooks.Size - 1; n >= 0; n--)
if (g.Hooks[n].Type == ImGuiContextHookType_PendingRemoval_)
g.Hooks.erase(&g.Hooks[n]);
CallContextHooks(&g, ImGuiContextHookType_NewFramePre);