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.

2 files changed, 38 insertions, 0 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);