BACKENDS: Add a default clipboard implementation

backends/platform/sdl/sdl.cpp

@@ -457,18 +457,14 @@ Common::String OSystem_SDL::getSystemLanguage() const {
 #endif // USE_DETECTLANG
 }
 
-bool OSystem_SDL::hasTextInClipboard() {
 #if SDL_VERSION_ATLEAST(2, 0, 0)
+bool OSystem_SDL::hasTextInClipboard() {
 	return SDL_HasClipboardText() == SDL_TRUE;
-#else
-	return false;
-#endif
 }
 
 Common::String OSystem_SDL::getTextFromClipboard() {
 	if (!hasTextInClipboard()) return "";
 
-#if SDL_VERSION_ATLEAST(2, 0, 0)
 	char *text = SDL_GetClipboardText();
 	// The string returned by SDL is in UTF-8. Convert to the
 	// current TranslationManager encoding or ISO-8859-1.
@@ -485,13 +481,9 @@ Common::String OSystem_SDL::getTextFromClipboard() {
 	SDL_free(text);
 
 	return strText;
-#else
-	return "";
-#endif
 }
 
 bool OSystem_SDL::setTextInClipboard(const Common::String &text) {
-#if SDL_VERSION_ATLEAST(2, 0, 0)
 	// The encoding we need to use is UTF-8. Assume we currently have the
 	// current TranslationManager encoding or ISO-8859-1.
 #ifdef USE_TRANSLATION
@@ -505,10 +497,8 @@ bool OSystem_SDL::setTextInClipboard(const Common::String &text) {
 		return status == 0;
 	}
 	return SDL_SetClipboardText(text.c_str()) == 0;
-#else
-	return false;
-#endif
 }
+#endif
 
 uint32 OSystem_SDL::getMillis(bool skipRecord) {
 	uint32 millis = SDL_GetTicks();

backends/platform/sdl/sdl.h

@@ -69,10 +69,12 @@ public:
 
 	virtual Common::String getSystemLanguage() const;
 
+#if SDL_VERSION_ATLEAST(2, 0, 0)
 	// Clipboard
 	virtual bool hasTextInClipboard();
 	virtual Common::String getTextFromClipboard();
 	virtual bool setTextInClipboard(const Common::String &text);
+#endif
 
 	virtual void setWindowCaption(const char *caption);
 	virtual void addSysArchivesToSearchSet(Common::SearchSet &s, int priority = 0);

common/system.h

@@ -216,6 +216,12 @@ protected:
 	 */
 	FilesystemFactory *_fsFactory;
 
+	/**
+	 * Used by the default clipboard implementation, for backends that don't
+	 * implement clipboard support.
+	 */
+	Common::String _clipboard;
+
 private:
 	/**
 	 * Indicate if initBackend() has been called.
@@ -374,8 +380,11 @@ public:
 		kFeatureDisplayLogFile,
 
 		/**
-		 * The presence of this feature indicates whether the hasTextInClipboard(),
-		 * getTextFromClipboard() and setTextInClipboard() calls are supported.
+		 * The presence of this feature indicates whether the system clipboard is
+		 * available. If this feature is not present, the hasTextInClipboard(),
+		 * getTextFromClipboard() and setTextInClipboard() calls can still be used,
+		 * however it should not be used in scenarios where the user is expected to
+		 * copy data outside of the application.
 		 *
 		 * This feature has no associated state.
 		 */
@@ -1451,7 +1460,7 @@ public:
 	 *
 	 * @return true if there is text in the clipboard, false otherwise
 	 */
-	virtual bool hasTextInClipboard() { return false; }
+	virtual bool hasTextInClipboard() { return !_clipboard.empty(); }
 
 	/**
 	 * Returns clipboard contents as a String.
@@ -1462,7 +1471,7 @@ public:
 	 *
 	 * @return clipboard contents ("" if hasTextInClipboard() == false)
 	 */
-	virtual Common::String getTextFromClipboard() { return ""; }
+	virtual Common::String getTextFromClipboard() { return _clipboard; }
 
 	/**
 	 * Set the content of the clipboard to the given string.
@@ -1473,7 +1482,7 @@ public:
 	 *
 	 * @return true if the text was properly set in the clipboard, false otherwise
 	 */
-	virtual bool setTextInClipboard(const Common::String &text) { return false; }
+	virtual bool setTextInClipboard(const Common::String &text) { _clipboard = text; return true; }
 
 	/**
 	 * Open the given Url in the default browser (if available on the target

engines/glk/selection.cpp

@@ -33,7 +33,6 @@ void Clipboard::clipboardStore(const Common::U32String &text) {
 }
 
 void Clipboard::clipboardSend(ClipSource source) {
-	if (g_system->hasFeature(OSystem::kFeatureClipboardSupport)) {
 	// Convert unicode string to standard string, since that's all ScummVM supports
 	Common::String text;
 	for (uint idx = 0; idx < _text.size(); ++idx)
@@ -41,10 +40,8 @@ void Clipboard::clipboardSend(ClipSource source) {
 
 	g_system->setTextInClipboard(text);
 }
-}
 
 void Clipboard::clipboardReceive(ClipSource source) {
-	if (g_system->hasFeature(OSystem::kFeatureClipboardSupport)) {
 	Windows &windows = *g_vm->_windows;
 
 	if (g_system->hasTextInClipboard()) {
@@ -56,7 +53,6 @@ void Clipboard::clipboardReceive(ClipSource source) {
 		}
 	}
 }
-}
 
 /*--------------------------------------------------------------------------*/
 

gui/console.cpp

@@ -523,7 +523,7 @@ void ConsoleDialog::specialKeys(Common::KeyCode keycode) {
 		g_gui.scheduleTopDialogRedraw();
 		break;
 	case Common::KEYCODE_v:
-		if (g_system->hasFeature(OSystem::kFeatureClipboardSupport) && g_system->hasTextInClipboard()) {
+		if (g_system->hasTextInClipboard()) {
 			Common::String text = g_system->getTextFromClipboard();
 			insertIntoPrompt(text.c_str());
 			scrollToCurrent();
@@ -531,7 +531,7 @@ void ConsoleDialog::specialKeys(Common::KeyCode keycode) {
 		}
 		break;
 	case Common::KEYCODE_c:
-		if (g_system->hasFeature(OSystem::kFeatureClipboardSupport)) {
+		{
 			Common::String userInput = getUserInput();
 			if (!userInput.empty())
 				g_system->setTextInClipboard(userInput);

gui/widgets/editable.cpp

@@ -186,7 +186,7 @@ bool EditableWidget::handleKeyDown(Common::KeyState state) {
 		break;
 
 	case Common::KEYCODE_v:
-		if (g_system->hasFeature(OSystem::kFeatureClipboardSupport) && state.flags & Common::KBD_CTRL) {
+		if (state.flags & Common::KBD_CTRL) {
 			if (g_system->hasTextInClipboard()) {
 				String text = g_system->getTextFromClipboard();
 				for (uint32 i = 0; i < text.size(); ++i) {
@@ -201,7 +201,7 @@ bool EditableWidget::handleKeyDown(Common::KeyState state) {
 		break;
 
 	case Common::KEYCODE_c:
-		if (g_system->hasFeature(OSystem::kFeatureClipboardSupport) && state.flags & Common::KBD_CTRL) {
+		if (state.flags & Common::KBD_CTRL) {
 			if (!getEditString().empty())
 				g_system->setTextInClipboard(getEditString());
 		} else {