source: opengl-game/gui/button.cpp@ 6bfd91c

#include "button.hpp"

#include <SDL2/SDL_ttf.h>
#include <SDL2/SDL2_gfxPrimitives.h>

#include "../vulkan-game.hpp"

// TODO: Figure out a good way to return errors instead of just printing them
// Probably throw an exception
// Make sure to cleanup anythign that was initialized correctly before the error
// TODO: Support better positioning options (e.g. align to left, right, top, bottom, center,
// and offsets from those positions)
Button::Button(string label, int x, int y, int padding, uint32_t color, uint32_t textColor,
      VulkanGame& gameInfo, SDL_Renderer& renderer,
      void (*onMouseClick)(VulkanGame& gameInfo),
      void (*onMouseEnter)(UIElement& element),
      void (*onMouseLeave)(UIElement& element)) :
      UIElement(x, y, 0, 0, renderer, onMouseClick, onMouseEnter, onMouseLeave),
      color(color),
      focused(false),
      gameInfo(gameInfo) {

   SDL_Color sdlTextColor {
      static_cast<Uint8>((textColor >> 24) & 0xFF),
      static_cast<Uint8>((textColor >> 16) & 0xFF),
      static_cast<Uint8>((textColor >> 8) & 0xFF),
      static_cast<Uint8>(textColor & 0xFF)
   };

   SDL_Surface* labelSurface = TTF_RenderText_Blended(this->gameInfo.proggyFont, label.c_str(),
      sdlTextColor);
   if (labelSurface == nullptr) {
      cout << "Unable to render text surface! SDL_ttf Error: " << TTF_GetError() << endl;
   }

   this->labelTexture = SDL_CreateTextureFromSurface(&this->renderer, labelSurface);
   if (this->labelTexture == nullptr) {
      cout << "Unable to create texture from rendered text! SDL Error: " << SDL_GetError() << endl;
      // SDL_FreeSurface(labelSurface);
   }

   SDL_FreeSurface(labelSurface);

   TTF_SizeText(this->gameInfo.proggyFont, label.c_str(), &this->labelWidth, &this->labelHeight);

   this->width = this->labelWidth + padding;
   this->height = this->labelHeight + padding;

   uint32_t rgb = color & 0xFFFFFF00;
   uint32_t a = color & 0xFF;

   this->focusColor = (int)(rgb * 1.6) | a;
}

Button::~Button() {
   if (this->labelTexture != nullptr) {
      SDL_DestroyTexture(this->labelTexture);
      this->labelTexture = nullptr;
   }
}

void Button::init() {
   this->focused = false;
}

void Button::render(int x, int y) {
   uint32_t cur_color = this->focused ? this->focusColor : this->color;

   uint8_t colorR = (cur_color >> 24) & 0xFF;
   uint8_t colorG = (cur_color >> 16) & 0xFF;
   uint8_t colorB = (cur_color >> 8) & 0xFF;
   uint8_t colorA = cur_color & 0xFF;

   boxRGBA(&this->renderer, this->x + x, this->y + y, this->x + this->width, this->y + this->height,
      colorR, colorG, colorB, colorA);

   SDL_Rect rect = {
         this->x + (this->width - this->labelWidth) / 2 + x,
         this->y + (this->height - this->labelHeight) / 2 + y,
         this->labelWidth,
         this->labelHeight
   };

   SDL_RenderCopy(&this->renderer, this->labelTexture, nullptr, &rect);
}

void Button::handleEvent(UIEvent& e) {
   switch(e.type) {
      case UI_EVENT_MOUSEMOTION:
         if (this->x < e.mouse.x && e.mouse.x < this->x + this->width &&
               this->y < e.mouse.y && e.mouse.y < this->y + this->height) {
            if (!this->focused) {
               this->focused = true;
               if (this->onMouseEnter != nullptr) {
                  this->onMouseEnter(*this);
               }
            }
         } else if (this->focused) {
            this->focused = false;
            if (this->onMouseLeave != nullptr) {
               this->onMouseLeave(*this);
            }
         }
         break;
      case UI_EVENT_MOUSEBUTTONDOWN:
         break;
      case UI_EVENT_MOUSEBUTTONUP:
         if (this->x < e.mouse.x && e.mouse.x < this->x + this->width &&
               this->y < e.mouse.y && e.mouse.y < this->y + this->height) {
            if (this->onMouseClick != nullptr) {
               this->onMouseClick(this->gameInfo);
            }
         }
         break;
      default:
         //cout << "Unhandled UI event: " << e.type << endl;
         break;
   }
}