Method NavUpdate

examples/ThirdPartyLibs/imgui/imgui.cpp:3041–3321

}

static void ImGui::NavUpdate()
{
	ImGuiContext& g = *GImGui;
	g.IO.WantMoveMouse = false;

#if 0
    if (g.NavScoringCount > 0) printf("[%05d] NavScoringCount %d for '%s' layer %d (Init:%d, Move:%d)\n", g.FrameCount, g.NavScoringCount, g.NavWindow ? g.NavWindow->Name : "NULL", g.NavLayer, g.NavInitRequest || g.NavInitResultId != 0, g.NavMoveRequest);
#endif

	// Update Keyboard->Nav inputs mapping
	memset(g.IO.NavInputs + ImGuiNavInput_InternalStart_, 0, (ImGuiNavInput_COUNT - ImGuiNavInput_InternalStart_) * sizeof(g.IO.NavInputs[0]));
	if (g.IO.NavFlags & ImGuiNavFlags_EnableKeyboard)
	{
#define NAV_MAP_KEY(_KEY, _NAV_INPUT) \
	if (g.IO.KeyMap[_KEY] != -1 && IsKeyDown(g.IO.KeyMap[_KEY])) g.IO.NavInputs[_NAV_INPUT] = 1.0f;
		NAV_MAP_KEY(ImGuiKey_Space, ImGuiNavInput_Activate);
		NAV_MAP_KEY(ImGuiKey_Enter, ImGuiNavInput_Input);
		NAV_MAP_KEY(ImGuiKey_Escape, ImGuiNavInput_Cancel);
		NAV_MAP_KEY(ImGuiKey_LeftArrow, ImGuiNavInput_KeyLeft_);
		NAV_MAP_KEY(ImGuiKey_RightArrow, ImGuiNavInput_KeyRight_);
		NAV_MAP_KEY(ImGuiKey_UpArrow, ImGuiNavInput_KeyUp_);
		NAV_MAP_KEY(ImGuiKey_DownArrow, ImGuiNavInput_KeyDown_);
		if (g.IO.KeyCtrl) g.IO.NavInputs[ImGuiNavInput_TweakSlow] = 1.0f;
		if (g.IO.KeyShift) g.IO.NavInputs[ImGuiNavInput_TweakFast] = 1.0f;
		if (g.IO.KeyAlt) g.IO.NavInputs[ImGuiNavInput_KeyMenu_] = 1.0f;
#undef NAV_MAP_KEY
	}

	memcpy(g.IO.NavInputsDownDurationPrev, g.IO.NavInputsDownDuration, sizeof(g.IO.NavInputsDownDuration));
	for (int i = 0; i < IM_ARRAYSIZE(g.IO.NavInputs); i++)
		g.IO.NavInputsDownDuration[i] = (g.IO.NavInputs[i] > 0.0f) ? (g.IO.NavInputsDownDuration[i] < 0.0f ? 0.0f : g.IO.NavInputsDownDuration[i] + g.IO.DeltaTime) : -1.0f;

	// Process navigation init request (select first/default focus)
	if (g.NavInitResultId != 0 && (!g.NavDisableHighlight || g.NavInitRequestFromMove))
	{
		// Apply result from previous navigation init request (will typically select the first item, unless SetItemDefaultFocus() has been called)
		IM_ASSERT(g.NavWindow);
		if (g.NavInitRequestFromMove)
			SetNavIDAndMoveMouse(g.NavInitResultId, g.NavLayer, g.NavInitResultRectRel);
		else
			SetNavID(g.NavInitResultId, g.NavLayer);
		g.NavWindow->NavRectRel[g.NavLayer] = g.NavInitResultRectRel;
	}
	g.NavInitRequest = false;
	g.NavInitRequestFromMove = false;
	g.NavInitResultId = 0;
	g.NavJustMovedToId = 0;

	// Process navigation move request
	if (g.NavMoveRequest && (g.NavMoveResultLocal.ID != 0 || g.NavMoveResultOther.ID != 0))
	{
		// Select which result to use
		ImGuiNavMoveResult* result = (g.NavMoveResultLocal.ID != 0) ? &g.NavMoveResultLocal : &g.NavMoveResultOther;
		if (g.NavMoveResultOther.ID != 0 && g.NavMoveResultOther.Window->ParentWindow == g.NavWindow)  // Maybe entering a flattened child? In this case solve the tie using the regular scoring rules
			if ((g.NavMoveResultOther.DistBox < g.NavMoveResultLocal.DistBox) || (g.NavMoveResultOther.DistBox == g.NavMoveResultLocal.DistBox && g.NavMoveResultOther.DistCenter < g.NavMoveResultLocal.DistCenter))
				result = &g.NavMoveResultOther;

		IM_ASSERT(g.NavWindow && result->Window);