Method tooltip

client/render/imgui_impl.cpp:1263–1316

}

void imgui_context::tooltip(std::string_view text)
{
	// FIXME: this is incorrect if we use the docking branch of imgui
	ImGuiViewport * viewport = ImGui::GetMainViewport();
	auto & current_layer = layer(ImGui::GetMousePos());

	assert(std::ranges::contains(layers_, true, &viewport::tooltip_viewport));
	auto & tooltip_layer = *std::ranges::find(layers_, true, &viewport::tooltip_viewport);

	// Get the item position before drawing the tooltip (top center)
	ImVec2 item_position{
	        (ImGui::GetItemRectMin().x + ImGui::GetItemRectMax().x) / 2,
	        ImGui::GetItemRectMin().y,
	};

	auto pos_backup = viewport->Pos;
	auto size_backup = viewport->Size;
	viewport->Pos = ImVec2(tooltip_layer.vp_origin.x, tooltip_layer.vp_origin.y);
	viewport->Size = ImVec2(tooltip_layer.vp_size.x, tooltip_layer.vp_size.y);

	// Draw the tooltip in the tooltip layer
	// Clamp position to avoid overflowing on the left or the right
	ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, constants::style::tooltip_padding);
	ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, constants::style::tooltip_rounding);

	auto & style = ImGui::GetStyle();
	const ImVec2 text_size = ImGui::CalcTextSize(text.data(), text.data() + text.size(), true);
	const ImVec2 tooltip_size = {text_size.x + style.WindowPadding.x * 2.0f, text_size.y + style.WindowPadding.y * 2.0f};

	ImGui::SetNextWindowPos(viewport->Pos + viewport->Size * 0.5, ImGuiCond_Always, {0.5, 0.5});
	ImGui::SetNextWindowSizeConstraints({0, 0}, viewport->Size);
	if (ImGui::BeginTooltip())
	{
		ImGui::PushStyleColor(ImGuiCol_Text, 0xffffffff);
		ImGui::TextUnformatted(text.data(), text.data() + text.size());
		ImGui::PopStyleColor();
		ImGui::EndTooltip();
	}
	ImGui::PopStyleVar(2);

	viewport->Pos = pos_backup;
	viewport->Size = size_backup;

	// Compute the tooltip position
	glm::quat tooltip_orientation = current_layer.orientation;
	auto M = glm::mat3_cast(tooltip_orientation);

	float pixel_size = current_layer.size.y / current_layer.vp_size.y;
	glm::vec3 tooltip_position_centre = rw_from_vp(item_position) + M * (glm::vec3(0, tooltip_size.y / 2, 0) * pixel_size + constants::style::tooltip_distance);

	// Position the tooltip layer
	tooltip_layer.position = tooltip_position_centre;
	tooltip_layer.orientation = tooltip_orientation;
}

// https://github.com/ocornut/imgui/issues/3379#issuecomment-2943903877
void ScrollWhenDragging()