Click and Drag Detection

1#include <SDL.h>
2#include <iostream>
3#include "Window.h"
4
5class DragDetector {
6 public:
7  void Tick() {
8    int x, y;
9    Uint32 Buttons = SDL_GetMouseState(&x, &y);
10
11    if (Buttons & SDL_BUTTON_LMASK) {
12      if (!IsDragging) {
13        // Start of drag
14        DragStartX = x;
15        DragStartY = y;
16        IsDragging = true;
17        std::cout << "Started dragging at ("
18          << x << ", " << y << ")\n";
19      } else {
20        // Continue dragging
21        int DragDistanceX = x - DragStartX;
22        int DragDistanceY = y - DragStartY;
23        std::cout << "Dragging - Distance: ("
24          << DragDistanceX << ", "
25          << DragDistanceY << ")\n";
26      }
27    } else if (IsDragging) {
28      // End of drag
29      IsDragging = false;
30      std::cout << "Stopped dragging\n";
31    }
32  }
33
34 private:
35  bool IsDragging{false};
36  int DragStartX{0};
37  int DragStartY{0};
38};
39
40int main(int argc, char** argv) {
41  SDL_Init(SDL_INIT_VIDEO);
42  Window GameWindow;
43  DragDetector Detector;
44  SDL_Event E;
45
46  while (true) {
47    while (SDL_PollEvent(&E)) {
48      // Handle other events...
49    }
50
51    Detector.Tick();
52    GameWindow.Update();
53  }
54
55  SDL_Quit();
56  return 0;
57}