6 files changed, 22 insertions, 0 deletions
diff --git a/launcher/ui/pages/modplatform/ModModel.cpp b/launcher/ui/pages/modplatform/ModModel.cpp
index afd8b292..1579bbf4 100644
--- a/launcher/ui/pages/modplatform/ModModel.cpp
+++ b/launcher/ui/pages/modplatform/ModModel.cpp
@@ -6,8 +6,10 @@
 
 #include "minecraft/MinecraftInstance.h"
 #include "minecraft/PackProfile.h"
+#include "minecraft/mod/ModFolderModel.h"
 
 #include <QMessageBox>
+#include <algorithm>
 
 namespace ResourceDownload {
 
@@ -67,4 +69,14 @@ void ModModel::searchWithTerm(const QString& term, unsigned int sort, bool filte
     refresh();
 }
 
+bool ModModel::isPackInstalled(ModPlatform::IndexedPack::Ptr pack) const
+{
+    auto allMods = static_cast<MinecraftInstance const&>(m_base_instance).loaderModList()->allMods();
+    return std::any_of(allMods.cbegin(), allMods.cend(), [pack](Mod* mod) {
+        if (auto meta = mod->metadata(); meta)
+            return meta->provider == pack->provider && meta->project_id == pack->addonId;
+        return false;
+    });
+}
+
 }  // namespace ResourceDownload
diff --git a/launcher/ui/pages/modplatform/ModModel.h b/launcher/ui/pages/modplatform/ModModel.h
index 5d4a7785..938ce32e 100644
--- a/launcher/ui/pages/modplatform/ModModel.h
+++ b/launcher/ui/pages/modplatform/ModModel.h
@@ -42,6 +42,7 @@ class ModModel : public ResourceModel {
 
    protected:
     auto documentToArray(QJsonDocument& obj) const -> QJsonArray override = 0;
+    virtual bool isPackInstalled(ModPlatform::IndexedPack::Ptr) const override;
 
    protected:
     const BaseInstance& m_base_instance;
diff --git a/launcher/ui/pages/modplatform/ResourceModel.cpp b/launcher/ui/pages/modplatform/ResourceModel.cpp
index a5ea1ca9..49405a02 100644
--- a/launcher/ui/pages/modplatform/ResourceModel.cpp
+++ b/launcher/ui/pages/modplatform/ResourceModel.cpp
@@ -77,6 +77,8 @@ auto ResourceModel::data(const QModelIndex& index, int role) const -> QVariant
             return pack->description;
         case UserDataTypes::SELECTED:
             return pack->isAnyVersionSelected();
+        case UserDataTypes::INSTALLED:
+            return this->isPackInstalled(pack);
         default:
             break;
     }
@@ -95,6 +97,7 @@ QHash<int, QByteArray> ResourceModel::roleNames() const
     roles[UserDataTypes::TITLE] = "title";
     roles[UserDataTypes::DESCRIPTION] = "description";
     roles[UserDataTypes::SELECTED] = "selected";
+    roles[UserDataTypes::INSTALLED] = "installed";
 
     return roles;
 }
diff --git a/launcher/ui/pages/modplatform/ResourceModel.h b/launcher/ui/pages/modplatform/ResourceModel.h
index 69e23473..6533d9c6 100644
--- a/launcher/ui/pages/modplatform/ResourceModel.h
+++ b/launcher/ui/pages/modplatform/ResourceModel.h
@@ -116,6 +116,8 @@ class ResourceModel : public QAbstractListModel {
     virtual void loadExtraPackInfo(ModPlatform::IndexedPack&, QJsonObject&);
     virtual void loadIndexedPackVersions(ModPlatform::IndexedPack&, QJsonArray&);
 
+    virtual bool isPackInstalled(ModPlatform::IndexedPack::Ptr) const { return false; }
+
    protected:
     /* Basic search parameters */
     enum class SearchState { None, CanFetchMore, ResetRequested, Finished } m_search_state = SearchState::None;
diff --git a/launcher/ui/pages/modplatform/flame/FlameModel.cpp b/launcher/ui/pages/modplatform/flame/FlameModel.cpp
index 5961ea02..d9d5ef5b 100644
--- a/launcher/ui/pages/modplatform/flame/FlameModel.cpp
+++ b/launcher/ui/pages/modplatform/flame/FlameModel.cpp
@@ -60,6 +60,8 @@ QVariant ListModel::data(const QModelIndex& index, int role) const
             return pack.description;
         case UserDataTypes::SELECTED:
             return false;
+        case UserDataTypes::INSTALLED:
+            return false;
         default:
             break;
     }
diff --git a/launcher/ui/pages/modplatform/modrinth/ModrinthModel.cpp b/launcher/ui/pages/modplatform/modrinth/ModrinthModel.cpp
index 346a00b0..55d287b0 100644
--- a/launcher/ui/pages/modplatform/modrinth/ModrinthModel.cpp
+++ b/launcher/ui/pages/modplatform/modrinth/ModrinthModel.cpp
@@ -106,6 +106,8 @@ auto ModpackListModel::data(const QModelIndex& index, int role) const -> QVarian
             return pack.description;
         case UserDataTypes::SELECTED:
             return false;
+        case UserDataTypes::INSTALLED:
+            return false;
         default:
             break;
     }