Bug 476 - SWT clipboard HTML transfer doesn't work

+ implemented HTML transfer in gtk4 clipboard snipper

Signed-off-by: Jason Wang

Author: Jason Wang

bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/gtk/org/eclipse/swt/dnd/Clipboard.java

@@ -349,6 +349,7 @@ private Object getContents_gtk4(Transfer transfer, int clipboards) {
 		}
 		return str;
 	}
+	//Pasting of Image
 	if(transfer.getTypeIds()[0] == (int)GDK.GDK_TYPE_PIXBUF()) {
 		ImageData imgData = null;
 		OS.g_value_init(value, GDK.GDK_TYPE_PIXBUF());
@@ -361,6 +362,22 @@ private Object getContents_gtk4(Transfer transfer, int clipboards) {
 		}
 		return imgData;
 	}
+	//Pasting of HTML
+	if(transfer.getTypeNames()[0].equals("text/html")) {
+		OS.g_value_init(value, OS.G_TYPE_STRING());
+		if (!GTK4.gdk_content_provider_get_value (contents, value, null)) return null;
+		long cStr = OS.g_value_get_string(value);
+		long [] items_written = new long [1];
+		long utf16Ptr = OS.g_utf8_to_utf16(cStr, -1, null, items_written, null);
+		OS.g_free(cStr);
+		if (utf16Ptr == 0) return null;
+		int length = (int)items_written[0];
+		char[] buffer = new char[length];
+		C.memmove(buffer, utf16Ptr, length * 2);
+		OS.g_free(utf16Ptr);
+		String str = new String(buffer);
+		return str;
+	}
 	//TODO: [GTK4] Other cases
 	return null;
 }

bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/gtk/org/eclipse/swt/dnd/ClipboardProxy.java

@@ -270,6 +270,14 @@ private long setProviderFromType(String string, Object data) {
 			}
 			image.dispose();
 		}
+		if(string.equals("text/html")) {
+			long value = OS.g_malloc (OS.GValue_sizeof());
+			C.memset (value, 0, OS.GValue_sizeof ());
+			OS.g_value_init(value, OS.G_TYPE_STRING());
+			OS.g_value_set_string(value, Converter.javaStringToCString((String)data));
+			provider = GTK4.gdk_content_provider_new_for_value(value);
+		}
+
 	}
 	return provider;
 }