ddnet/src/game/client/components/tooltips.cpp

#include "tooltips.h"

#include <game/client/render.h>
#include <game/client/ui.h>

CTooltips::CTooltips()
{
	OnReset();
}

void CTooltips::OnReset()
{
	m_HoverTime = -1;
	m_Tooltips.clear();
}

void CTooltips::SetActiveTooltip(CTooltip &Tooltip)
{
	if(m_ActiveTooltip.has_value())
		return;

	m_ActiveTooltip.emplace(Tooltip);
	m_HoverTime = time_get();
}

inline void CTooltips::ClearActiveTooltip()
{
	m_ActiveTooltip.reset();
}

void CTooltips::DoToolTip(const void *pID, const CUIRect *pNearRect, const char *pText, float WidthHint)
{
	uintptr_t ID = reinterpret_cast<uintptr_t>(pID);
	const auto result = m_Tooltips.emplace(ID, CTooltip{
							   *pNearRect,
							   pText,
							   WidthHint,
							   false});
	CTooltip &Tooltip = result.first->second;

	if(!result.second)
	{
		Tooltip.m_Rect = *pNearRect; // update in case of window resize
		Tooltip.m_pText = pText; // update in case of language change
	}

	Tooltip.m_OnScreen = true;

	if(UI()->MouseInside(&Tooltip.m_Rect))
	{
		SetActiveTooltip(Tooltip);
	}
}

void CTooltips::OnRender()
{
	if(m_ActiveTooltip.has_value())
	{
		CTooltip &Tooltip = m_ActiveTooltip.value();

		if(!UI()->MouseInside(&Tooltip.m_Rect))
		{
			Tooltip.m_OnScreen = false;
			ClearActiveTooltip();
			return;
		}

		if(!Tooltip.m_OnScreen)
			return;

		// Delay tooltip until 1 second passed.
		if(m_HoverTime > time_get() - time_freq())
			return;

		constexpr float FontSize = 14.0f;
		constexpr float Margin = 5.0f;
		constexpr float Padding = 5.0f;

		const STextBoundingBox BoundingBox = TextRender()->TextBoundingBox(FontSize, Tooltip.m_pText, -1, Tooltip.m_WidthHint);
		CUIRect Rect;
		Rect.w = BoundingBox.m_W + 2 * Padding;
		Rect.h = BoundingBox.m_H + 2 * Padding;

		const CUIRect *pScreen = UI()->Screen();
		Rect.w = minimum(Rect.w, pScreen->w - 2 * Margin);
		Rect.h = minimum(Rect.h, pScreen->h - 2 * Margin);

		// Try the top side.
		if(Tooltip.m_Rect.y - Rect.h - Margin > pScreen->y)
		{
			Rect.x = clamp(UI()->MouseX() - Rect.w / 2.0f, Margin, pScreen->w - Rect.w - Margin);
			Rect.y = Tooltip.m_Rect.y - Rect.h - Margin;
		}
		// Try the bottom side.
		else if(Tooltip.m_Rect.y + Tooltip.m_Rect.h + Margin < pScreen->h)
		{
			Rect.x = clamp(UI()->MouseX() - Rect.w / 2.0f, Margin, pScreen->w - Rect.w - Margin);
			Rect.y = Tooltip.m_Rect.y + Tooltip.m_Rect.h + Margin;
		}
		// Try the right side.
		else if(Tooltip.m_Rect.x + Tooltip.m_Rect.w + Margin + Rect.w < pScreen->w)
		{
			Rect.x = Tooltip.m_Rect.x + Tooltip.m_Rect.w + Margin;
			Rect.y = clamp(UI()->MouseY() - Rect.h / 2.0f, Margin, pScreen->h - Rect.h - Margin);
		}
		// Try the left side.
		else if(Tooltip.m_Rect.x - Rect.w - Margin > pScreen->x)
		{
			Rect.x = Tooltip.m_Rect.x - Rect.w - Margin;
			Rect.y = clamp(UI()->MouseY() - Rect.h / 2.0f, Margin, pScreen->h - Rect.h - Margin);
		}

		Rect.Draw(ColorRGBA(0.2f, 0.2f, 0.2f, 0.8f), IGraphics::CORNER_ALL, Padding);
		Rect.Margin(Padding, &Rect);
		SLabelProperties Props;
		Props.m_MaxWidth = Tooltip.m_WidthHint;
		UI()->DoLabel(&Rect, Tooltip.m_pText, FontSize, TEXTALIGN_ML, Props);
		Tooltip.m_OnScreen = false;
	}
}