[UI] Host Notification: Replace previous notification in case of new one

src/xenia/ui/imgui_drawer.cc

@@ -467,20 +467,32 @@ void ImGuiDrawer::Draw(UIDrawContext& ui_draw_context) {
   dialog_loop_next_index_ = SIZE_MAX;
 
   if (!notifications_.empty()) {
-    bool was_guest_notification_drawn = false;
-    bool was_host_notification_drawn = false;
+    std::vector<ui::ImGuiNotification*> guest_notifications = {};
+    std::vector<ui::ImGuiNotification*> host_notifications = {};
 
-    for (const auto& notification : notifications_) {
-      if (notification->GetNotificationType() == NotificationType::Guest &&
-          !was_guest_notification_drawn) {
-        was_guest_notification_drawn = true;
-        notification->Draw();
-      }
+    std::copy_if(notifications_.cbegin(), notifications_.cend(),
+                 std::back_inserter(guest_notifications),
+                 [](ui::ImGuiNotification* notification) {
+                   return notification->GetNotificationType() ==
+                          NotificationType::Guest;
+                 });
 
-      if (notification->GetNotificationType() == NotificationType::Host &&
-          !was_host_notification_drawn) {
-        was_host_notification_drawn = true;
-        notification->Draw();
+    std::copy_if(notifications_.cbegin(), notifications_.cend(),
+                 std::back_inserter(host_notifications),
+                 [](ui::ImGuiNotification* notification) {
+                   return notification->GetNotificationType() ==
+                          NotificationType::Host;
+                 });
+
+    if (guest_notifications.size() > 0) {
+      guest_notifications.at(0)->Draw();
+    }
+
+    if (host_notifications.size() > 0) {
+      host_notifications.at(0)->Draw();
+
+      if (host_notifications.size() > 1) {
+        host_notifications.at(0)->SetDeletionPending();
       }
     }
   }

src/xenia/ui/imgui_host_notification.cc

@@ -25,7 +25,7 @@ ImGuiHostNotification::ImGuiHostNotification(ui::ImGuiDrawer* imgui_drawer,
                                              uint8_t position_id)
     : ImGuiNotification(imgui_drawer, NotificationType::Host, title,
                         description, user_index, position_id) {
-  SetCreationTime(Clock::QueryHostUptimeMillis());
+  SetCreationTime(Clock::QueryHostUptimeMillis() + notification_initial_delay);
   imgui_drawer->AddNotification(this);
 }
 
@@ -39,11 +39,16 @@ const ImVec2 ImGuiHostNotification::CalculateNotificationSize(ImVec2 text_size,
 }
 
 void HostNotificationWindow::OnDraw(ImGuiIO& io) {
-  if (IsNotificationClosingTime()) {
+  if (IsNotificationClosingTime() || IsMarkedForDeletion()) {
     delete this;
     return;
   }
 
+  // Adding 200ms of delay in case of notification spam.
+  if (Clock::QueryHostUptimeMillis() < GetCreationTime()) {
+    return;
+  }
+
   const std::string longest_notification_text_line =
       GetTitle().size() > GetDescription().size() ? GetTitle().c_str()
                                                   : GetDescription().c_str();

src/xenia/ui/imgui_host_notification.h

@@ -26,6 +26,9 @@ class ImGuiHostNotification : public ImGuiNotification {
   ~ImGuiHostNotification();
 
  protected:
+  const uint64_t notification_initial_delay =
+      std::chrono::milliseconds(200).count();
+
   const ImVec2 CalculateNotificationSize(ImVec2 text_size,
                                          float scale) override;
 

src/xenia/ui/imgui_notification.cc

@@ -37,7 +37,7 @@ ImGuiNotification::~ImGuiNotification() {
 void ImGuiNotification::Draw() { OnDraw(imgui_drawer_->GetIO()); }
 
 const NotificationAlignment ImGuiNotification::GetNotificationAlignment(
-    const uint8_t notification_position_id) {
+    const uint8_t notification_position_id) const {
   NotificationAlignment alignment = NotificationAlignment::kAlignUnknown;
 
   if (notification_position_id >=
@@ -60,7 +60,8 @@ const NotificationAlignment ImGuiNotification::GetNotificationAlignment(
 }
 
 const ImVec2 ImGuiNotification::CalculateNotificationScreenPosition(
-    ImVec2 screen_size, ImVec2 window_size, uint8_t notification_position_id) {
+    ImVec2 screen_size, ImVec2 window_size,
+    uint8_t notification_position_id) const {
   ImVec2 result = {NAN, NAN};
 
   if (window_size.x >= screen_size.x || window_size.y >= screen_size.y) {

src/xenia/ui/imgui_notification.h

@@ -63,14 +63,21 @@ class ImGuiNotification {
     return notification_type_;
   }
 
+  void SetDeletionPending() { marked_for_deletion_ = true; }
+
  protected:
   ImGuiDrawer* GetDrawer() { return imgui_drawer_; }
 
-  const bool IsNotificationClosingTime() {
-    return Clock::QueryHostUptimeMillis() - creation_time_ > time_to_close_;
+  const bool IsNotificationClosingTime() const {
+    const uint64_t current_time = Clock::QueryHostUptimeMillis();
+    // We're before showing notification
+    if (current_time < creation_time_) {
+      return false;
+    }
+    return current_time - creation_time_ > time_to_close_;
   }
 
-  const std::string GetNotificationText() {
+  const std::string GetNotificationText() const {
     std::string text = title_;
 
     if (!description_.empty()) {
@@ -83,17 +90,20 @@ class ImGuiNotification {
     creation_time_ = new_creation_time;
   }
 
-  const std::string GetTitle() { return title_; }
-  const std::string GetDescription() { return description_; }
+  const bool IsMarkedForDeletion() const { return marked_for_deletion_; }
+  const std::string GetTitle() const { return title_; }
+  const std::string GetDescription() const { return description_; }
 
-  const uint8_t GetPositionId() { return position_; }
-  const uint8_t GetUserIndex() { return user_index_; }
+  const uint8_t GetPositionId() const { return position_; }
+  const uint8_t GetUserIndex() const { return user_index_; }
+  const uint64_t GetCreationTime() const { return creation_time_; }
 
   const NotificationAlignment GetNotificationAlignment(
-      const uint8_t notification_position_id);
+      const uint8_t notification_position_id) const;
 
   const ImVec2 CalculateNotificationScreenPosition(
-      ImVec2 screen_size, ImVec2 window_size, uint8_t notification_position_id);
+      ImVec2 screen_size, ImVec2 window_size,
+      uint8_t notification_position_id) const;
 
   virtual const ImVec2 CalculateNotificationSize(ImVec2 text_size,
                                                  float scale) = 0;
@@ -114,6 +124,8 @@ class ImGuiNotification {
   std::string title_;
   std::string description_;
 
+  bool marked_for_deletion_ = false;
+
   ImGuiDrawer* imgui_drawer_ = nullptr;
 };