Implement file drop handler (#666)

src/PowderToySDL.cpp

@@ -400,6 +400,10 @@ void EventProcess(SDL_Event event)
 
 		hasMouseMoved = true;
 		break;
+	case SDL_DROPFILE:
+		engine->onFileDrop(event.drop.file);
+		SDL_free(event.drop.file);
+		break;
 	case SDL_MOUSEBUTTONDOWN:
 		// if mouse hasn't moved yet, sdl will send 0,0. We don't want that
 		if (hasMouseMoved)

src/client/Client.cpp

@@ -1025,23 +1025,10 @@ void Client::MoveStampToFront(ByteString stampID)
 SaveFile * Client::GetStamp(ByteString stampID)
 {
 	ByteString stampFile = ByteString(STAMPS_DIR PATH_SEP + stampID + ".stm");
-	SaveFile * file = new SaveFile(stampID);
-	if (!FileExists(stampFile))
-		stampFile = stampID;
-	if (FileExists(stampFile))
-	{
-		try
-		{
-			GameSave * tempSave = new GameSave(ReadFile(stampFile));
-			file->SetGameSave(tempSave);
-		}
-		catch (ParseException & e)
-		{
-			std::cerr << "Client: Invalid stamp file, " << stampID << " " << e.what() << std::endl;
-			file->SetLoadingError(ByteString(e.what()).FromUtf8());
-		}
-	}
-	return file;
+	SaveFile *saveFile = LoadSaveFile(stampFile);
+	if (!saveFile)
+		saveFile = LoadSaveFile(stampID);
+	return saveFile;
 }
 
 void Client::DeleteStamp(ByteString stampID)
@@ -1482,6 +1469,24 @@ SaveInfo * Client::GetSave(int saveID, int saveDate)
 	return NULL;
 }
 
+SaveFile * Client::LoadSaveFile(ByteString filename)
+{
+	if (!FileExists(filename))
+		return nullptr;
+	SaveFile * file = new SaveFile(filename);
+	try
+	{
+		GameSave * tempSave = new GameSave(ReadFile(filename));
+		file->SetGameSave(tempSave);
+	}
+	catch (ParseException & e)
+	{
+		std::cerr << "Client: Invalid save file '" << filename << "': " << e.what() << std::endl;
+		file->SetLoadingError(ByteString(e.what()).FromUtf8());
+	}
+	return file;
+}
+
 std::vector<std::pair<ByteString, int> > * Client::GetTags(int start, int count, String query, int & resultCount)
 {
 	lastError = "";

src/client/Client.h

@@ -147,6 +147,7 @@ public:
 	std::vector<std::pair<ByteString, int> > * GetTags(int start, int count, String query, int & resultCount);
 
 	SaveInfo * GetSave(int saveID, int saveDate);
+	SaveFile * LoadSaveFile(ByteString filename);
 
 	RequestStatus DeleteSave(int saveID);
 	RequestStatus ReportSave(int saveID, String message);

src/gui/game/GameView.cpp

@@ -25,6 +25,7 @@
 
 #include "gui/Style.h"
 #include "gui/dialogues/ConfirmPrompt.h"
+#include "gui/dialogues/ErrorMessage.h"
 #include "gui/dialogues/InformationMessage.h"
 #include "gui/interface/Button.h"
 #include "gui/interface/Colour.h"
@@ -1705,6 +1706,29 @@ void GameView::OnBlur()
 	c->Blur();
 }
 
+void GameView::OnFileDrop(ByteString filename)
+{
+	if (!(filename.EndsWith(".cps") || filename.EndsWith(".stm")))
+	{
+		new ErrorMessage("Error loading save", "Dropped file is not a TPT save file (.cps or .stm format)");
+		return;
+	}
+
+	SaveFile *saveFile = Client::Ref().LoadSaveFile(filename);
+	if (!saveFile)
+		return;
+	if (saveFile->GetError().length())
+	{
+		new ErrorMessage("Error loading save", "Dropped save file could not be loaded: " + saveFile->GetError());
+		return;
+	}
+	c->LoadSaveFile(saveFile);
+	delete saveFile;
+
+	// hide the info text if it's not already hidden
+	introText = 0;
+}
+
 void GameView::OnTick(float dt)
 {
 	if (selectMode == PlaceSave && !placeSaveThumb)

src/gui/game/GameView.h

@@ -196,6 +196,7 @@ public:
 	void OnTick(float dt) override;
 	void OnDraw() override;
 	void OnBlur() override;
+	void OnFileDrop(ByteString filename) override;
 
 	//Top-level handlers, for Lua interface
 	void DoExit() override;

src/gui/interface/Engine.cpp

@@ -313,3 +313,9 @@ void Engine::onClose()
 	if (state_)
 		state_->DoExit();
 }
+
+void Engine::onFileDrop(ByteString filename)
+{
+	if (state_)
+		state_->DoFileDrop(filename);
+}

src/gui/interface/Engine.h

@@ -34,6 +34,7 @@ namespace ui
 		void onTextInput(String text);
 		void onResize(int newWidth, int newHeight);
 		void onClose();
+		void onFileDrop(ByteString filename);
 
 		void Begin(int width, int height);
 		inline bool Running() { return running_; }

src/gui/interface/Window.cpp

@@ -162,6 +162,11 @@ void Window::DoFocus()
 	OnFocus();
 }
 
+void Window::DoFileDrop(ByteString filename)
+{
+	OnFileDrop(filename);
+}
+
 void Window::DoDraw()
 {
 	OnDraw();

src/gui/interface/Window.h

@@ -59,6 +59,7 @@ namespace ui
 		virtual void DoDraw();
 		virtual void DoFocus();
 		virtual void DoBlur();
+		virtual void DoFileDrop(ByteString filename);
 
 		virtual void DoMouseMove(int x, int y, int dx, int dy);
 		virtual void DoMouseDown(int x, int y, unsigned button);
@@ -94,6 +95,7 @@ namespace ui
 		virtual void OnDraw() {}
 		virtual void OnFocus() {}
 		virtual void OnBlur() {}
+		virtual void OnFileDrop(ByteString filename) {}
 
 		virtual void OnTryExit(ExitMethod);
 		virtual void OnTryOkay(OkayMethod);