ggwave-gui : wip file sharing support

examples/ggwave-gui/main.cpp

@@ -7,10 +7,37 @@
 #include <SDL.h>
 #include <SDL_opengl.h>
 
-// ImGui helpers
+#include <fstream>
+#include <vector>
+#include <iterator>
 
-bool ImGui_BeginFrame(SDL_Window * window);
-bool ImGui_EndFrame(SDL_Window * window);
+std::vector<char> readFile(const char* filename) {
+    // open the file:
+    std::ifstream file(filename, std::ios::binary);
+
+    // Stop eating new lines in binary mode!!!
+    file.unsetf(std::ios::skipws);
+
+    // get its size:
+    std::streampos fileSize;
+
+    file.seekg(0, std::ios::end);
+    fileSize = file.tellg();
+    file.seekg(0, std::ios::beg);
+
+    // reserve capacity
+    std::vector<char> vec;
+    vec.reserve(fileSize);
+
+    // read the data:
+    vec.insert(vec.begin(),
+               std::istream_iterator<char>(file),
+               std::istream_iterator<char>());
+
+    return vec;
+}
+
+// ImGui helpers
 
 bool ImGui_BeginFrame(SDL_Window * window) {
     SDL_Event event;
@@ -19,6 +46,12 @@ bool ImGui_BeginFrame(SDL_Window * window) {
         ImGui_ProcessEvent(&event);
         if (event.type == SDL_QUIT) return false;
         if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window)) return false;
+        if (event.type == SDL_DROPFILE) {
+            printf("Dropped file: '%s'\n", event.drop.file);
+            auto data = readFile(event.drop.file);
+            addFile(event.drop.file, event.drop.file, std::move(data));
+            break;
+        }
     }
 
     ImGui_NewFrame(window);
@@ -123,20 +156,24 @@ int main(int argc, char** argv) {
         return -1;
     }
 
+    ImGui_PreInit();
+
     int windowX = 400;
     int windowY = 600;
     const char * windowTitle = "ggwave-gui";
 
     SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
     SDL_Window * window = SDL_CreateWindow(windowTitle, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, windowX, windowY, window_flags);
-
     void * gl_context = SDL_GL_CreateContext(window);
+
     SDL_GL_MakeCurrent(window, gl_context);
     SDL_GL_SetSwapInterval(1); // Enable vsync
 
     ImGui_Init(window, gl_context);
     ImGui_SetStyle();
 
+    SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
+
     ImGui_NewFrame(window);
     ImGui::Render();