From b01d49fa5264e81d7f3c8681d6d3d6e909bcbf12 Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Sat, 17 Jul 2021 20:09:41 +1000
Subject: [PATCH] CommonHostInterface: Enable rewind for Android

---
 src/frontend-common/common_host_interface.cpp | 58 ++++++++++++-------
 src/frontend-common/common_host_interface.h   |  3 +
 2 files changed, 39 insertions(+), 22 deletions(-)

diff --git a/src/frontend-common/common_host_interface.cpp b/src/frontend-common/common_host_interface.cpp
index 202e9f0b8..25bfbd948 100644
--- a/src/frontend-common/common_host_interface.cpp
+++ b/src/frontend-common/common_host_interface.cpp
@@ -2010,6 +2010,12 @@ bool CommonHostInterface::AddRumbleToInputMap(const std::string& binding, u32 co
   return false;
 }
 
+static void DisplayHotkeyBlockedByChallengeModeMessage()
+{
+  g_host_interface->AddOSDMessage(g_host_interface->TranslateStdString(
+    "OSDMessage", "Hotkey unavailable because achievements hardcore mode is active."));
+}
+
 void CommonHostInterface::SetFastForwardEnabled(bool enabled)
 {
   if (!System::IsValid())
@@ -2034,6 +2040,33 @@ void CommonHostInterface::SetTurboEnabled(bool enabled)
                 2.0f);
 }
 
+void CommonHostInterface::SetRewindState(bool enabled)
+{
+  if (!System::IsValid())
+    return;
+
+  if (!IsCheevosChallengeModeActive())
+  {
+    if (!g_settings.rewind_enable)
+    {
+      if (enabled)
+        AddOSDMessage(TranslateStdString("OSDMessage", "Rewinding is not enabled."), 5.0f);
+
+      return;
+    }
+
+    AddOSDMessage(enabled ? TranslateStdString("OSDMessage", "Rewinding...") :
+                            TranslateStdString("OSDMessage", "Stopped rewinding."),
+                  5.0f);
+    System::SetRewinding(enabled);
+    UpdateSpeedLimiterState();
+  }
+  else
+  {
+    DisplayHotkeyBlockedByChallengeModeMessage();
+  }
+}
+
 void CommonHostInterface::RegisterHotkeys()
 {
   RegisterGeneralHotkeys();
@@ -2043,12 +2076,6 @@ void CommonHostInterface::RegisterHotkeys()
   RegisterAudioHotkeys();
 }
 
-static void DisplayHotkeyBlockedByChallengeModeMessage()
-{
-  g_host_interface->AddOSDMessage(g_host_interface->TranslateStdString(
-    "OSDMessage", "Hotkey unavailable because achievements hardcore mode is active."));
-}
-
 void CommonHostInterface::RegisterGeneralHotkeys()
 {
 #ifndef __ANDROID__
@@ -2189,25 +2216,12 @@ void CommonHostInterface::RegisterSystemHotkeys()
                        DisplayHotkeyBlockedByChallengeModeMessage();
                    }
                  });
+#endif
 
   RegisterHotkey(StaticString(TRANSLATABLE("Hotkeys", "System")), StaticString("Rewind"),
-                 StaticString(TRANSLATABLE("Hotkeys", "Rewind")), [this](bool pressed) {
-                   if (System::IsValid())
-                   {
-                     if (!IsCheevosChallengeModeActive())
-                     {
-                       AddOSDMessage(pressed ? TranslateStdString("OSDMessage", "Rewinding...") :
-                                               TranslateStdString("OSDMessage", "Stopped rewinding."),
-                                     5.0f);
-                       System::SetRewinding(pressed);
-                     }
-                     else
-                     {
-                       DisplayHotkeyBlockedByChallengeModeMessage();
-                     }
-                   }
-                 });
+                 StaticString(TRANSLATABLE("Hotkeys", "Rewind")), [this](bool pressed) { SetRewindState(pressed); });
 
+#ifndef __ANDROID__
   RegisterHotkey(StaticString(TRANSLATABLE("Hotkeys", "System")), StaticString("ToggleCheats"),
                  StaticString(TRANSLATABLE("Hotkeys", "Toggle Cheats")), [this](bool pressed) {
                    if (pressed && System::IsValid())
diff --git a/src/frontend-common/common_host_interface.h b/src/frontend-common/common_host_interface.h
index 970d22cef..31aa33e4d 100644
--- a/src/frontend-common/common_host_interface.h
+++ b/src/frontend-common/common_host_interface.h
@@ -334,6 +334,9 @@ public:
   bool IsTurboEnabled() const { return m_turbo_enabled; }
   void SetTurboEnabled(bool enabled);
 
+  /// Toggles rewind state.
+  void SetRewindState(bool enabled);
+
   /// ImGui window drawing.
   void DrawFPSWindow();
   void DrawOSDMessages();