Transparency of Modal Windows

[nikmes]

Is there a way to control transparency of a modal window? Looks like below dose not allow to pass ALPHA value as an argument.
if (ImGui::BeginPopupModal("File Operations", NULL, ImGuiWindowFlags_HorizontalScrollbar))
I tried to play with below:
ImGui::PushStyleVar(ImGuiStyleVar_Alpha, 0.f);
But didnt get desired results. Instead i got Modal window on a GREY background.
Thanks!

[nikmes]

I don't want the Warning Window to have transparency at all.

[ocornut]

There is an inconsistency discussed in #337, you could alter the "style.WindowFillAlphaDefault" field and set it to 1.0.

This field may be removed and instead the value flattened across the different WindowBg colors.

[nikmes]

Thanks! It works but i need to restore back the global Alpha Default otherwise all windows in rendering loop get this value. Thanks for you support!

I do something like this
prevAlpha = ImGui::GetStyle().WindowFillAlphaDefault;
ImGui::GetStyle().WindowFillAlphaDefault = 1.0;
.....
ImGui::GetStyle().WindowFillAlphaDefault = prevAlpha;

[ocornut]

Yes this should be the correct workaround. I am hesitating to add an enum for PushStyleVar() because this value should be removed eventually. See the update I just made to #337.

[nikmes]

Hi i checked the update. Wouldn't be easier just to allow the ImGui::BeginPopupModal to accept arguments like the ImGui::Begin("Grid Properties", opened, ImVec2(0, 0), 0.90f, ImGuiWindowFlags_NoScrollbar) ?

[ocornut]

No because that 'alpha' parameter is part of an obsolete Begin() entry point and is very rarely used. For a rarely used parameter it would make more sense to have a PushStyleVar(WindowFillAlpha, 1.0f) thing rather than bloating entry points.

[ocornut]

@nikmes Btw I realized this issue has been fixed a while ago (1.60) with the addition of SetNextWindowBgAlpha(). Closing this issue accordingly.