Method TextEx

KBotExt/imgui/imgui_widgets.cpp:146–252

//-------------------------------------------------------------------------

void ImGui::TextEx(const char* text, const char* text_end, ImGuiTextFlags flags)
{
	ImGuiWindow* window = GetCurrentWindow();
	if (window->SkipItems)
		return;
	ImGuiContext& g = *GImGui;

	// Accept null ranges
	if (text == text_end)
		text = text_end = "";

	// Calculate length
	const char* text_begin = text;
	if (text_end == NULL)
		text_end = text + strlen(text); // FIXME-OPT

	const ImVec2 text_pos(window->DC.CursorPos.x, window->DC.CursorPos.y + window->DC.CurrLineTextBaseOffset);
	const float wrap_pos_x = window->DC.TextWrapPos;
	const bool wrap_enabled = (wrap_pos_x >= 0.0f);
	if (text_end - text <= 2000 || wrap_enabled)
	{
		// Common case
		const float wrap_width = wrap_enabled ? CalcWrapWidthForPos(window->DC.CursorPos, wrap_pos_x) : 0.0f;
		const ImVec2 text_size = CalcTextSize(text_begin, text_end, false, wrap_width);

		ImRect bb(text_pos, text_pos + text_size);
		ItemSize(text_size, 0.0f);
		if (!ItemAdd(bb, 0))
			return;

		// Render (we don't hide text after ## in this end-user function)
		RenderTextWrapped(bb.Min, text_begin, text_end, wrap_width);
	}
	else
	{
		// Long text!
		// Perform manual coarse clipping to optimize for long multi-line text
		// - From this point we will only compute the width of lines that are visible. Optimization only available when word-wrapping is disabled.
		// - We also don't vertically center the text within the line full height, which is unlikely to matter because we are likely the biggest and only item on the line.
		// - We use memchr(), pay attention that well optimized versions of those str/mem functions are much faster than a casually written loop.
		const char* line = text;
		const float line_height = GetTextLineHeight();
		ImVec2 text_size(0, 0);

		// Lines to skip (can't skip when logging text)
		ImVec2 pos = text_pos;
		if (!g.LogEnabled)
		{
			int lines_skippable = (int)((window->ClipRect.Min.y - text_pos.y) / line_height);
			if (lines_skippable > 0)
			{
				int lines_skipped = 0;
				while (line < text_end && lines_skipped < lines_skippable)
				{
					const char* line_end = (const char*)memchr(line, '\n', text_end - line);
					if (!line_end)
						line_end = text_end;
					if ((flags & ImGuiTextFlags_NoWidthForLargeClippedText) == 0)