add new movement keys: {Up,Down}{Album,Artist}

src/search_engine.cpp

@@ -264,6 +264,90 @@ void SearchEngine::UpdateFoundList()
 	}
 }
 
+void SearchEngine::Scroll(int input)
+{
+	size_t pos = w->Choice();
+	size_t oldpos = pos;
+	//w->Goto(pos);
+	//w->Goto(pos2);
+	//std::string album = w->at(pos).second->GetAlbum();
+	//ShowMessage("pos (choice): %i / pos2 (realchoice): %i / album: %s", pos, pos2, album.c_str());
+	//return;
+
+	// above the reset button
+	if (pos < StaticOptions - 4)
+	{
+		if (Keypressed(input, Key.UpAlbum) ||
+		    Keypressed(input, Key.UpArtist))
+			w->Highlight(0);
+		else if (Keypressed(input, Key.DownAlbum) ||
+		         Keypressed(input, Key.DownArtist))
+			w->Highlight(StaticOptions - 4);    // reset
+		return;
+	}
+
+	// reset button
+	if (pos == StaticOptions - 4)
+	{
+		if (Keypressed(input, Key.UpAlbum) ||
+		    Keypressed(input, Key.UpArtist))
+			w->Highlight(0);
+		else if (Keypressed(input, Key.DownAlbum) ||
+		         Keypressed(input, Key.DownArtist))
+			w->Highlight(StaticOptions);	    // first search result
+		return;
+	}
+
+	// first search result
+	if (pos == StaticOptions)
+	{
+		if (Keypressed(input, Key.UpAlbum))
+		{
+			w->Highlight(StaticOptions - 4);    // reset
+			return;
+		}
+		else if (Keypressed(input, Key.UpArtist))
+		{
+			w->Highlight(0);
+			return;
+		}
+	}
+
+	// we are in the search results at this point
+	if (pos >= StaticOptions)
+	{
+		if (Keypressed(input, Key.UpAlbum))
+		{
+			std::string album = w->at(pos).second->GetAlbum();
+			while (pos > StaticOptions)
+				if (w->at(--pos).second->GetAlbum() != album)
+					break;
+		}
+		else if (Keypressed(input, Key.DownAlbum))
+		{
+			std::string album = w->at(pos).second->GetAlbum();
+			while (pos < w->Size() - 1)
+				if (w->at(++pos).second->GetAlbum() != album)
+					break;
+		}
+		else if (Keypressed(input, Key.UpArtist))
+		{
+			std::string artist = w->at(pos).second->GetArtist();
+			while (pos > StaticOptions)
+				if (w->at(--pos).second->GetArtist() != artist)
+					break;
+		}
+		else if (Keypressed(input, Key.DownArtist))
+		{
+			std::string artist = w->at(pos).second->GetArtist();
+			while (pos < w->Size() - 1)
+				if (w->at(++pos).second->GetArtist() != artist)
+					break;
+		}
+		w->Highlight(pos);
+	}
+}
+
 void SearchEngine::Prepare()
 {
 	for (size_t i = 0; i < w->Size(); ++i)