StyledEdit:supress unlock if the file is on RO volume

Show the "Read-only" status for documents that are living on read-only
volumes and do not show unlock menu for such files.

* The enhancement pointed out by Sergei Reznikov (Diver). Thanks!

src/apps/stylededit/StatusView.cpp

@@ -44,7 +44,8 @@ StatusView::StatusView(BScrollView* scrollView)
 				B_FOLLOW_BOTTOM | B_FOLLOW_LEFT, B_WILL_DRAW),
 			fScrollView(scrollView),
 			fPreferredSize(0., 0.),
-			fReadOnly(false)
+			fReadOnly(false),
+			fCanUnlock(false)
 {
 	memset(fCellWidth, 0, sizeof(fCellWidth));
 }
@@ -155,7 +156,7 @@ StatusView::Draw(BRect updateRect)
 void
 StatusView::MouseDown(BPoint where)
 {
-	if (!fReadOnly)
+	if (!fReadOnly || !fCanUnlock)
 		return;
 
 	float left = fCellWidth[kPositionCell] + fCellWidth[kEncodingCell];
@@ -212,11 +213,13 @@ StatusView::SetStatus(BMessage* message)
 
 	bool modified = false;
 	fReadOnly = false;
+	fCanUnlock = false;
 	if (B_OK == message->FindBool("modified", &modified) && modified) {
 		fCellText[kFileStateCell] = B_TRANSLATE("Modified");
 	} else if (B_OK == message->FindBool("readOnly", &fReadOnly) && fReadOnly) {
 		fCellText[kFileStateCell] = B_TRANSLATE("Read-only");
-		fCellText[kFileStateCell] << " " UTF8_EXPAND_ARROW;
+	    if (B_OK == message->FindBool("canUnlock", &fCanUnlock) && fCanUnlock)
+			fCellText[kFileStateCell] << " " UTF8_EXPAND_ARROW;
 	} else
 		fCellText[kFileStateCell].Truncate(0);
 

src/apps/stylededit/StatusView.h

@@ -45,6 +45,7 @@ private:
 			BString			fCellText[kStatusCellCount];
 			float			fCellWidth[kStatusCellCount];
 			bool			fReadOnly;
+			bool			fCanUnlock;
 			BString			fEncoding;
 };
 

src/apps/stylededit/StyledEditWindow.cpp

@@ -48,6 +48,7 @@
 #include <TranslationUtils.h>
 #include <UnicodeChar.h>
 #include <UTF8.h>
+#include <Volume.h>
 
 
 using namespace BPrivate;
@@ -517,10 +518,17 @@ StyledEditWindow::MessageReceived(BMessage* message)
 			break;
 
 		case UPDATE_STATUS:
+		{
 			message->AddBool("modified", !fClean);
-			message->AddBool("readOnly", !fTextView->IsEditable());
+			bool readOnly = !fTextView->IsEditable();
+			message->AddBool("readOnly", readOnly);
+			if (readOnly) {
+				BVolume volume(fNodeRef.device);
+				message->AddBool("canUnlock", !volume.IsReadOnly());
+			}
 			fStatusView->SetStatus(message);
 			break;
+		}
 
 		case UNLOCK_FILE:
 		{
@@ -1437,6 +1445,8 @@ StyledEditWindow::_LoadFile(entry_ref* ref, const char* forceEncoding)
 		bool editable = (getuid() == st.st_uid && S_IWUSR & st.st_mode)
 					|| (getgid() == st.st_gid && S_IWGRP & st.st_mode)
 					|| (S_IWOTH & st.st_mode);
+		BVolume volume(ref->device);
+		editable = editable && !volume.IsReadOnly();
 		_SetReadOnly(!editable);
 	}