Method BeginViewportSideBar

KBotExt/imgui/imgui_widgets.cpp:7044–7077

Important: calling order matters! FIXME: Somehow overlapping with docking tech. FIXME: The "rect-cut" aspect of this could be formalized into a lower-level helper (rect-cut: https://halt.software/dead-simple-layouts)

// FIXME: Somehow overlapping with docking tech.
// FIXME: The "rect-cut" aspect of this could be formalized into a lower-level helper (rect-cut: https://halt.software/dead-simple-layouts)
bool ImGui::BeginViewportSideBar(const char* name, ImGuiViewport* viewport_p, ImGuiDir dir, float axis_size, ImGuiWindowFlags window_flags)
{
	IM_ASSERT(dir != ImGuiDir_None);

	ImGuiWindow* bar_window = FindWindowByName(name);
	if (bar_window == NULL || bar_window->BeginCount == 0)
	{
		// Calculate and set window size/position
		ImGuiViewportP* viewport = (ImGuiViewportP*)(void*)(viewport_p ? viewport_p : GetMainViewport());
		ImRect avail_rect = viewport->GetBuildWorkRect();
		ImGuiAxis axis = (dir == ImGuiDir_Up || dir == ImGuiDir_Down) ? ImGuiAxis_Y : ImGuiAxis_X;
		ImVec2 pos = avail_rect.Min;
		if (dir == ImGuiDir_Right || dir == ImGuiDir_Down)
			pos[axis] = avail_rect.Max[axis] - axis_size;
		ImVec2 size = avail_rect.GetSize();
		size[axis] = axis_size;
		SetNextWindowPos(pos);
		SetNextWindowSize(size);

		// Report our size into work area (for next frame) using actual window size
		if (dir == ImGuiDir_Up || dir == ImGuiDir_Left)
			viewport->BuildWorkOffsetMin[axis] += axis_size;
		else if (dir == ImGuiDir_Down || dir == ImGuiDir_Right)
			viewport->BuildWorkOffsetMax[axis] -= axis_size;
	}

	window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
	PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
	PushStyleVar(ImGuiStyleVar_WindowMinSize, ImVec2(0, 0)); // Lift normal size constraint
	bool is_open = Begin(name, NULL, window_flags);
	PopStyleVar(2);

	return is_open;
}

bool ImGui::BeginMainMenuBar()
{