Comments (2)
However, in the scenario that there is a docked window A and a floating window B, when B is closed and a fade out occurs, the alpha of window A also changes. This only occurs while window A is docked. When undocked, it behaves as expected:
You are overriding global Alpha and not restoring it. So it leaks into those other windows and is used by the docking system inside NewFrame()
.
Use PushStyleVar(ImGuiStyleVar_Alpha, alpha); .... PopStyleVar()
instead.
This seems to work:
{
ImGui::PushStyleColor(ImGuiCol_WindowBg, ImVec4(0, 0, 0, 0));
ImGui::DockSpaceOverViewport(ImGui::GetMainViewport(), ImGuiDockNodeFlags_PassthruCentralNode);
ImGui::PopStyleColor();
static float alpha = 0.7f;
ImGui::SliderFloat("alpha", &alpha, 0.0f, 1.0f);
ImGui::PushStyleVar(ImGuiStyleVar_Alpha, alpha);
ImGui::PushStyleColor(ImGuiCol_WindowBg, ImVec4(1, 0, 0, 1));
ImGui::Begin("Some window");
ImGui::Text("Hello");
ImGui::End();
ImGui::PopStyleColor();
ImGui::PopStyleVar();
}
Note that the TabItem itself doesn't use the specified alpha, it seems undesirable. The TabBar is owned by the dock node not a single window.
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I see, this is much better, thank you.
Your note about the TabItem
is reasonable and clears up part of my question, thanks.
Closing as no further questions.
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