ALL: Move Clipboard support to OSystem

Commit adds kFeatureClipboardSupport. hasTextInClipboard() and
getTextFromClipboard().

OSystem_SDL has this feature if SDL2 is used.

EditableWidget and StorageWizardDialog use g_system to access clipboard
now.

5 files changed, 99 insertions, 58 deletions

diff --git a/backends/platform/sdl/sdl.cpp b/backends/platform/sdl/sdl.cpp
index 9f7b29233d..6862bb349f 100644
--- a/backends/platform/sdl/sdl.cpp
+++ b/backends/platform/sdl/sdl.cpp
@@ -64,6 +64,11 @@
 #include <SDL/SDL_net.h>
 #endif
 
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_clipboard.h>
+#endif
+
 OSystem_SDL::OSystem_SDL()
 	:
 #ifdef USE_OPENGL
@@ -171,6 +176,13 @@ void OSystem_SDL::init() {
 
 }
 
+bool OSystem_SDL::hasFeature(Feature f) {
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+	if (f == kFeatureClipboardSupport) return true;
+#endif
+	return ModularBackend::hasFeature(f);
+}
+
 void OSystem_SDL::initBackend() {
 	// Check if backend has not been initialized
 	assert(!_inited);
@@ -453,6 +465,26 @@ Common::String OSystem_SDL::getSystemLanguage() const {
 #endif // USE_DETECTLANG
 }
 
+bool OSystem_SDL::hasTextInClipboard() {
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+	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();
+	if (text == nullptr) return "";
+	return text;
+#else
+	return "";
+#endif
+}
+
 uint32 OSystem_SDL::getMillis(bool skipRecord) {
 	uint32 millis = SDL_GetTicks();
 
diff --git a/backends/platform/sdl/sdl.h b/backends/platform/sdl/sdl.h
index f440cd77bb..17b4e9b001 100644
--- a/backends/platform/sdl/sdl.h
+++ b/backends/platform/sdl/sdl.h
@@ -55,6 +55,8 @@ public:
 	 */
 	virtual SdlMixerManager *getMixerManager();
 
+	virtual bool hasFeature(Feature f);
+
 	// Override functions from ModularBackend and OSystem
 	virtual void initBackend();
 #if defined(USE_TASKBAR)
@@ -69,6 +71,10 @@ public:
 
 	virtual Common::String getSystemLanguage() const;
 
+	// Clipboard
+	virtual bool hasTextInClipboard();
+	virtual Common::String getTextFromClipboard();
+
 	virtual void setWindowCaption(const char *caption);
 	virtual void addSysArchivesToSearchSet(Common::SearchSet &s, int priority = 0);
 	virtual uint32 getMillis(bool skipRecord = false);
diff --git a/common/system.h b/common/system.h
index 3cbeee7d82..805eba68ed 100644
--- a/common/system.h
+++ b/common/system.h
@@ -314,7 +314,15 @@ public:
 		 *
 		 * This feature has no associated state.
 		 */
-		kFeatureDisplayLogFile
+		kFeatureDisplayLogFile,
+
+		/**
+		* The presence of this feature indicates whether the hasTextInClipboard()
+		* and getTextFromClipboard() calls are supported.
+		*
+		* This feature has no associated state.
+		*/
+		kFeatureClipboardSupport
 	};
 
 	/**
@@ -1239,6 +1247,28 @@ public:
 	virtual bool displayLogFile() { return false; }
 
 	/**
+	* Returns whether there is text available in the clipboard.
+	*
+	* The kFeatureClipboardSupport feature flag can be used to
+	* test whether this call has been implemented by the active
+	* backend.
+	*
+	* @return true if there is text in the clipboard, false otherwise
+	*/
+	virtual bool hasTextInClipboard() { return false; }
+
+	/**
+	* Returns clipboard contents as a String.
+	*
+	* The kFeatureClipboardSupport feature flag can be used to
+	* test whether this call has been implemented by the active
+	* backend.
+	*
+	* @return clipboard contents ("" if hasTextInClipboard() == false)
+	*/
+	virtual Common::String getTextFromClipboard() { return ""; }
+
+	/**
 	 * Returns the locale of the system.
 	 *
 	 * This returns the currently set up locale of the system, on which
diff --git a/gui/storagewizarddialog.cpp b/gui/storagewizarddialog.cpp
index 6d0c504521..dd1a3aae37 100644
--- a/gui/storagewizarddialog.cpp
+++ b/gui/storagewizarddialog.cpp
@@ -20,13 +20,6 @@
  *
  */
 
-#ifdef USE_SDL2
-#define FORBIDDEN_SYMBOL_ALLOW_ALL
-
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_clipboard.h>
-#endif
-
 #include "gui/storagewizarddialog.h"
 #include "gui/gui-manager.h"
 #include "gui/message.h"
@@ -217,32 +210,27 @@ void StorageWizardDialog::handleCommand(CommandSender *sender, uint32 cmd, uint3
 		break;
 	}
 	case kPasteCodeCmd: {
-#ifdef USE_SDL2
-		if (SDL_HasClipboardText() == SDL_TRUE) {
-			char *text = SDL_GetClipboardText();
-			if (text != nullptr) {
-				Common::String message = text;
-				for (uint32 i = 0; i < CODE_FIELDS; ++i) {
-					if (message.empty()) break;
-					Common::String subcode = "";
-					for (uint32 j = 0; j < message.size(); ++j) {
-						if (message[j] == ' ') {
-							message.erase(0, j+1);
-							break;
-						}
-						subcode += message[j];
-						if (j+1 == message.size()) {
-							message = "";
-							break;
-						}
+		if (g_system->hasTextInClipboard()) {
+			Common::String message = g_system->getTextFromClipboard();
+			for (uint32 i = 0; i < CODE_FIELDS; ++i) {
+				if (message.empty()) break;
+				Common::String subcode = "";
+				for (uint32 j = 0; j < message.size(); ++j) {
+					if (message[j] == ' ') {
+						message.erase(0, j+1);
+						break;
+					}
+					subcode += message[j];
+					if (j+1 == message.size()) {
+						message = "";
+						break;
 					}
-					_codeWidget[i]->setEditString(subcode);
 				}
-				handleCommand(sender, kCodeBoxCmd, data);
-				draw();
+				_codeWidget[i]->setEditString(subcode);
 			}
+			handleCommand(sender, kCodeBoxCmd, data);
+			draw();
 		}
-#endif
 		break;
 	}
 	case kConnectCmd: {
@@ -302,11 +290,7 @@ void StorageWizardDialog::containerWidgetsReflow() {
 	}
 	if (_openUrlWidget) _openUrlWidget->setVisible(true);
 	if (_pasteCodeWidget) {
-#ifdef USE_SDL2
-		bool visible = showFields;
-#else
-		bool visible = false;
-#endif
+		bool visible = showFields && g_system->hasFeature(OSystem::kFeatureClipboardSupport);
 		_pasteCodeWidget->setVisible(visible);
 	}
 
diff --git a/gui/widgets/editable.cpp b/gui/widgets/editable.cpp
index 6c63074fd1..02defe9a56 100644
--- a/gui/widgets/editable.cpp
+++ b/gui/widgets/editable.cpp
@@ -20,13 +20,6 @@
  *
  */
 
-#ifdef USE_SDL2
-#define FORBIDDEN_SYMBOL_ALLOW_ALL
-
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_clipboard.h>
-#endif
-
 #include "common/rect.h"
 #include "common/system.h"
 #include "gui/widgets/editable.h"
@@ -192,24 +185,20 @@ bool EditableWidget::handleKeyDown(Common::KeyState state) {
 		forcecaret = true;
 		break;
 
-#ifdef USE_SDL2
-		case Common::KEYCODE_v:
-			if (state.flags & Common::KBD_CTRL) {
-				if (SDL_HasClipboardText() == SDL_TRUE) {
-					char *text = SDL_GetClipboardText();
-					if (text != nullptr) {
-						for (char *ptr = text; *ptr; ++ptr) {
-							if (tryInsertChar(*ptr, _caretPos))
-								++_caretPos;
-						}
-						dirty = true;
-					}
+	case Common::KEYCODE_v:
+		if (g_system->hasFeature(OSystem::kFeatureClipboardSupport) && state.flags & Common::KBD_CTRL) {
+			if (g_system->hasTextInClipboard()) {
+				String text = g_system->getTextFromClipboard();
+				for (uint32 i = 0; i < text.size(); ++i) {
+					if (tryInsertChar(text[i], _caretPos))
+						++_caretPos;
 				}
-			} else {
-				defaultKeyDownHandler(state, dirty, forcecaret, handled);
+				dirty = true;
 			}
-			break;
-#endif
+		} else {
+			defaultKeyDownHandler(state, dirty, forcecaret, handled);
+		}
+		break;
 
 #ifdef MACOSX
 	// Let ctrl-a / ctrl-e move the caret to the start / end of the line.