Method Selectable

KBotExt/imgui/imgui_widgets.cpp:6444–6584

Tip: pass a non-visible label (e.g. "##hello") then you can use the space to draw other text or image. But you need to make sure the ID is unique, e.g. enclose calls in PushID/PopID or use ##unique_id. With this scheme, ImGuiSelectableFlags_SpanAllColumns and ImGuiSelectableFlags_AllowOverlap are also frequently used flags. FIXME: Selectable() with (size.x == 0.0f) and (SelectableTextAlign.x > 0.0

// With this scheme, ImGuiSelectableFlags_SpanAllColumns and ImGuiSelectableFlags_AllowOverlap are also frequently used flags.
// FIXME: Selectable() with (size.x == 0.0f) and (SelectableTextAlign.x > 0.0f) followed by SameLine() is currently not supported.
bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags flags, const ImVec2& size_arg)
{
	ImGuiWindow* window = GetCurrentWindow();
	if (window->SkipItems)
		return false;

	ImGuiContext& g = *GImGui;
	const ImGuiStyle& style = g.Style;

	// Submit label or explicit size to ItemSize(), whereas ItemAdd() will submit a larger/spanning rectangle.
	ImGuiID id = window->GetID(label);
	ImVec2 label_size = CalcTextSize(label, NULL, true);
	ImVec2 size(size_arg.x != 0.0f ? size_arg.x : label_size.x, size_arg.y != 0.0f ? size_arg.y : label_size.y);
	ImVec2 pos = window->DC.CursorPos;
	pos.y += window->DC.CurrLineTextBaseOffset;
	ItemSize(size, 0.0f);

	// Fill horizontal space
	// We don't support (size < 0.0f) in Selectable() because the ItemSpacing extension would make explicitly right-aligned sizes not visibly match other widgets.
	const bool span_all_columns = (flags & ImGuiSelectableFlags_SpanAllColumns) != 0;
	const float min_x = span_all_columns ? window->ParentWorkRect.Min.x : pos.x;
	const float max_x = span_all_columns ? window->ParentWorkRect.Max.x : window->WorkRect.Max.x;
	if (size_arg.x == 0.0f || (flags & ImGuiSelectableFlags_SpanAvailWidth))
		size.x = ImMax(label_size.x, max_x - min_x);

	// Text stays at the submission position, but bounding box may be extended on both sides
	const ImVec2 text_min = pos;
	const ImVec2 text_max(min_x + size.x, pos.y + size.y);

	// Selectables are meant to be tightly packed together with no click-gap, so we extend their box to cover spacing between selectable.
	ImRect bb(min_x, pos.y, text_max.x, text_max.y);
	if ((flags & ImGuiSelectableFlags_NoPadWithHalfSpacing) == 0)
	{
		const float spacing_x = span_all_columns ? 0.0f : style.ItemSpacing.x;
		const float spacing_y = style.ItemSpacing.y;
		const float spacing_L = IM_FLOOR(spacing_x * 0.50f);
		const float spacing_U = IM_FLOOR(spacing_y * 0.50f);
		bb.Min.x -= spacing_L;
		bb.Min.y -= spacing_U;
		bb.Max.x += (spacing_x - spacing_L);
		bb.Max.y += (spacing_y - spacing_U);
	}
	//if (g.IO.KeyCtrl) { GetForegroundDrawList()->AddRect(bb.Min, bb.Max, IM_COL32(0, 255, 0, 255)); }

	// Modify ClipRect for the ItemAdd(), faster than doing a PushColumnsBackground/PushTableBackground for every Selectable..
	const float backup_clip_rect_min_x = window->ClipRect.Min.x;
	const float backup_clip_rect_max_x = window->ClipRect.Max.x;
	if (span_all_columns)
	{
		window->ClipRect.Min.x = window->ParentWorkRect.Min.x;
		window->ClipRect.Max.x = window->ParentWorkRect.Max.x;
	}

	const bool disabled_item = (flags & ImGuiSelectableFlags_Disabled) != 0;
	const bool item_add = ItemAdd(bb, id, NULL, disabled_item ? ImGuiItemFlags_Disabled : ImGuiItemFlags_None);
	if (span_all_columns)
	{
		window->ClipRect.Min.x = backup_clip_rect_min_x;