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101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
#include "ui/TextScroll.hpp"
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#include "sdl.hpp"
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#include "logger.hpp"
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namespace
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{
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/// @brief This is the number of ticks needed before the text starts scrolling.
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constexpr uint64_t TICKS_SCROLL_TRIGGER = 3000;
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} // namespace
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ui::TextScroll::TextScroll(std::string_view text,
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int fontSize,
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int availableWidth,
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int y,
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bool center,
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sdl::Color color)
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{
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TextScroll::create(text, fontSize, availableWidth, y, center, color);
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}
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void ui::TextScroll::create(std::string_view text,
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int fontSize,
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int availableWidth,
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int y,
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bool center,
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sdl::Color color)
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{
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// Copy the text and stuff.
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m_text = text;
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m_y = y;
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m_fontSize = fontSize;
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m_textColor = color;
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m_scrollTimer.start(TICKS_SCROLL_TRIGGER);
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// Get the width and calculate X.
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m_textWidth = sdl::text::get_width(m_fontSize, m_text.c_str());
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if (m_textWidth > availableWidth)
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{
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// Set the X coordinate to 8 and make sure this knows it needs to scroll.
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m_x = 8;
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m_textScrolling = true;
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logger::log("Scrolling needed?");
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}
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else if (center)
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{
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// Just center it.
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m_x = (availableWidth / 2) - (m_textWidth / 2);
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logger::log("Centered.");
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}
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else
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{
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// Just set this to 8. To do: Figure out how to make this cleaner.
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m_x = 8;
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logger::log("Aligned.");
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}
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}
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void ui::TextScroll::update(bool hasFocus)
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{
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// I don't think needs to care about having focus.
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if (m_textScrolling && m_scrollTimer.is_triggered())
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{
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logger::log("Text scroll triggered?");
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m_x -= 2;
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m_textScrollTriggered = true;
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}
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else if (m_textScrollTriggered && m_x > -(m_textWidth + 16))
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{
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m_x -= 2;
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}
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else if (m_textScrollTriggered && m_x <= -(m_textWidth + 16))
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{
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// This will snap the text back to where it was, but the user won't even notice it. It just looks like it's scrolling.
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m_x = 8;
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m_textScrollTriggered = false;
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m_scrollTimer.restart();
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}
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}
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void ui::TextScroll::render(SDL_Texture *target, bool hasFocus)
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{
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// If we don't need to scroll the text, just render it as-is centered according to the width passed earlier.
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if (!m_textScrolling)
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{
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sdl::text::render(target, m_x, m_y, m_fontSize, sdl::text::NO_TEXT_WRAP, m_textColor, m_text.c_str());
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}
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else
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{
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// We're going to render text twice so it looks like it's scrolling and doesn't end. Ever.
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sdl::text::render(target, m_x, m_y, m_fontSize, sdl::text::NO_TEXT_WRAP, m_textColor, m_text.c_str());
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sdl::text::render(target,
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m_x + m_textWidth + 24,
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m_y,
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m_fontSize,
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sdl::text::NO_TEXT_WRAP,
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m_textColor,
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m_text.c_str());
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}
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}
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