i have no clue what i am doing ... but terrible full screen

Osmium.cpp

@@ -13,6 +13,7 @@ int main(int argc, char **argv) {
 	glfwInit();
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE);
 	glfwWindowHint(GLFW_DECORATED, GLFW_FALSE);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 
@@ -92,19 +93,68 @@ int main(int argc, char **argv) {
 				drag_start_window_y = window_y;
 			}
 
+
+			static bool is_maximized = false;
+			static int restore_x, restore_y, restore_w, restore_h;
+
+
+
+
 			if (dragging_window) {
 				if (is_held) {
 					double dx = global_mouse_x - drag_start_global_x;
 					double dy = global_mouse_y - drag_start_global_y;
 
-					glfwSetWindowPos(window,
+					int new_x = drag_start_window_x + static_cast<int>(dx);
-									 drag_start_window_x + static_cast<int>(dx),
+					int new_y = drag_start_window_y + static_cast<int>(dy);
-									 drag_start_window_y + static_cast<int>(dy));
+
+					glfwSetWindowPos(window, new_x, new_y);
+
+
+					GLFWmonitor* primaryMonitor = glfwGetPrimaryMonitor();
+					int monitor_x, monitor_y, monitor_w, monitor_h;
+					if (glfwGetMonitorWorkarea) {
+						glfwGetMonitorWorkarea(primaryMonitor, &monitor_x, &monitor_y, &monitor_w, &monitor_h);
+					}
+
+
+					const int tolerance = 2;
+					if (!is_maximized && abs(new_y - monitor_y) <= tolerance) {
+
+						glfwGetWindowPos(window, &restore_x, &restore_y);
+						glfwGetWindowSize(window, &restore_w, &restore_h);
+
+
+						glfwSetWindowPos(window, monitor_x, monitor_y);
+						glfwSetWindowSize(window, monitor_w, monitor_h);
+						is_maximized = true;
+						dragging_window = false;
+					}
 				} else {
 					dragging_window = false;
 				}
+
+				if (!dragging_window && is_maximized) {
+					double mx, my;
+					glfwGetCursorPos(window, &mx, &my);
+					if (ImGui::IsMouseDown(0) && my < 10.0) {
+						// Start unmaximize drag
+						is_maximized = false;
+						glfwSetWindowSize(window, restore_w, restore_h);
+						glfwSetWindowPos(window,
+										 static_cast<int>(global_mouse_x - restore_w / 2),
+										 static_cast<int>(global_mouse_y - 10));
+						dragging_window = true;
+						drag_start_global_x = global_mouse_x;
+						drag_start_global_y = global_mouse_y;
+						drag_start_window_x = static_cast<int>(global_mouse_x - restore_w / 2);
+						drag_start_window_y = static_cast<int>(global_mouse_y - 10);
+					}
+				}
+
 			}
 
+
 			// --- MENU ITEMS ALWAYS RENDERED ---
 			if (ImGui::BeginMenu("File")) {
 				if (ImGui::MenuItem("Quit")) {
@@ -113,23 +163,45 @@ int main(int argc, char **argv) {
 				ImGui::EndMenu();
 			}
 
-			float window_width = ImGui::GetWindowWidth();
+			float window_widthA = ImGui::GetWindowWidth();
 			ImVec2 size = ImGui::CalcTextSize("x");
 			float button_width = size.x + ImGui::GetStyle().FramePadding.x * 2;
-			ImGui::SameLine(window_width - button_width - ImGui::GetStyle().ItemSpacing.x);
+			ImGui::SameLine(window_widthA - button_width - ImGui::GetStyle().ItemSpacing.x);
 
 			if (ImGui::Button("x")) {
-				// Button clicked logic
+
 				std::cout << "Exiting..." << std::endl;
 				glfwSetWindowShouldClose(window, true);
 			}
-
 			ImGui::EndMainMenuBar();
 
 
 		}
 
 
+		GLFWmonitor* primaryMonitor = glfwGetPrimaryMonitor();
+		int monitor_x, monitor_y, monitor_width, monitor_height;
+
+
+		if (glfwGetMonitorWorkarea) {
+			glfwGetMonitorWorkarea(primaryMonitor, &monitor_x, &monitor_y, &monitor_width, &monitor_height);
+		} else {
+			// Fallback
+			const GLFWvidmode* mode = glfwGetVideoMode(primaryMonitor);
+			glfwGetMonitorPos(primaryMonitor, &monitor_x, &monitor_y);
+			monitor_width = mode->width;
+			monitor_height = mode->height;
+		}
+
+
+		int win_x, win_y;
+		glfwGetWindowPos(window, &win_x, &win_y);
+
+
+		const int tolerance = 5;
+		if (abs(win_y - monitor_y) <= tolerance) {
+			std::cout << "Window is at the top of the main screen!" << std::endl;
+		}