make devices movable

gui/include/DeviceRenderer.hpp

@@ -13,8 +13,11 @@ public:
     void Render(SDL_Renderer* renderer) const;
     void Deselect();
 
+    bool PropagateEvent(SDL_Event* event);
+
 private:
     SDL_FRect bbox;
     bool selected;
+    bool grabbed;
     std::shared_ptr<Device> device;
 };

gui/include/NetworkRenderer.hpp

@@ -11,6 +11,8 @@ public:
     void AddDevice(std::shared_ptr<Device> device, uint16_t x, uint16_t y);
     void Render(SDL_Renderer* renderer) const;
 
+    void PropagateEvent(SDL_Event* event);
+
 private:
     Network& network;
     std::vector<DeviceRenderer> devices;

gui/src/DeviceRenderer.cpp

@@ -3,7 +3,7 @@
 #include <SDL.h>
 
 DeviceRenderer::DeviceRenderer(std::shared_ptr<Device> device, uint16_t x, uint16_t y) :
-    device(device), selected(false)
+    device(device), selected(false), grabbed(false)
 {
     bbox.x = x;
     bbox.y = y;
@@ -15,6 +15,35 @@ void DeviceRenderer::Deselect() {
     selected = false;
 }
 
+bool DeviceRenderer::PropagateEvent(SDL_Event* event) {
+    if (event->type == SDL_EVENT_MOUSE_BUTTON_UP) {
+        if (event->button.button == SDL_BUTTON_LEFT) {
+            grabbed = false;
+        }
+    }
+    else if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
+        float x, y;
+        SDL_GetMouseState(&x, &y);
+
+        if (x >= bbox.x && x <= bbox.x + bbox.w && y >= bbox.y && y <= bbox.y + bbox.h) {
+            selected = true;
+            grabbed = true;
+            return true;
+        }
+
+    } else if (grabbed && event->type == SDL_EVENT_MOUSE_MOTION) {
+       float x, y;
+       SDL_GetMouseState(&x, &y); 
+
+       bbox.x += event->motion.xrel;
+       bbox.y += event->motion.yrel;
+
+       return true;
+    }
+
+    return false;
+}
+
 void DeviceRenderer::Render(SDL_Renderer* renderer) const {
     SDL_SetRenderDrawColor(renderer, 150, 150, 150, 255);
     SDL_RenderFillRect(renderer, &bbox);

gui/src/NetworkRenderer.cpp

@@ -12,6 +12,20 @@ void NetworkRenderer::AddDevice(std::shared_ptr<Device> device, uint16_t x, uint
     devices.push_back(DeviceRenderer(device, x, y));
 }
 
+void NetworkRenderer::PropagateEvent(SDL_Event* event) {
+    if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
+        for (DeviceRenderer& device : devices) {
+            device.Deselect();
+        }
+    }
+
+    for (auto it = devices.rbegin(); it != devices.rend(); it++) {
+        if (it->PropagateEvent(event)) {
+            break;
+        }
+    }
+}
+
 void NetworkRenderer::Render(SDL_Renderer* renderer) const {
     for (const DeviceRenderer& device : devices) {
         device.Render(renderer);

gui/src/main.cpp

@@ -36,6 +36,7 @@ int main(int argc, char** argv) {
     while (!shouldClose) {
         while (SDL_PollEvent(&event)) {
             ImGui_ImplSDL3_ProcessEvent(&event);
+            networkRenderer.PropagateEvent(&event);
 
             switch (event.type) {
                 case SDL_EVENT_WINDOW_CLOSE_REQUESTED: