add option to allow scrolling past the end of the file

locales/en.catkeys

@@ -1,10 +1,11 @@
-1	English	x-vnd.KapiX-Koder	519025525
+1	English	x-vnd.KapiX-Koder	2883905919
 Something wrong has happened while opening the configuration file. Your personal settings will not be %s%.	Preferences		Something wrong has happened while opening the configuration file. Your personal settings will not be %s%.
 Access denied	EditorWindow		Access denied
 Line endings	EditorWindow		Line endings
 Use custom font	AppPreferencesWindow		Use custom font
 In selection	FindWindow		In selection
 About…	EditorWindow		About…
+Allow scrolling past end of file	AppPreferencesWindow		Allow scrolling past end of file
 The file contains unsaved changes. What to do?	EditorWindow		The file contains unsaved changes. What to do?
 Replace:	FindWindow		Replace:
 Cancel	QuitAlert		Cancel

src/editor/EditorWindow.cpp

@@ -1310,6 +1310,7 @@ EditorWindow::_SyncWithPreferences()
 		fEditor->SendMessage(SCI_SETCARETLINEFRAME, fPreferences->fLineHighlightingMode ? 2 : 0);
 		fEditor->SendMessage(SCI_SETCARETSTYLE,
 			fPreferences->fUseBlockCursor ? (CARETSTYLE_BLOCK | CARETSTYLE_BLOCK_AFTER) : CARETSTYLE_LINE, 0);
+		fEditor->SendMessage(SCI_SETENDATLASTLINE, !fPreferences->fScrollPastEndOfFile);
 
 		if(fFilePreferences.fEOLMode) {
 			fEditor->SendMessage(SCI_SETEOLMODE, fFilePreferences.fEOLMode.value_or(SC_EOL_LF), 0);

src/preferences/AppPreferencesWindow.cpp

@@ -211,6 +211,10 @@ AppPreferencesWindow::MessageReceived(BMessage* message)
 			fPreferences->fFontSize = fFontSizeSpinner->Value();
 			_PreferencesModified();
 		} break;
+		case Actions::SCROLL_PAST_END: {
+			fPreferences->fScrollPastEndOfFile = IsChecked(fScrollPastEndCB);
+			_PreferencesModified();
+		} break;
 		case Actions::REVERT: {
 			*fPreferences = *fStartPreferences;
 			_PreferencesModified();
@@ -342,6 +346,7 @@ AppPreferencesWindow::_InitInterface()
 
 	fBracesHighlightingCB = new BCheckBox("bracesHighlighting", B_TRANSLATE("Highlight braces"), new BMessage((uint32) Actions::BRACES_HIGHLIGHTING));
 	fBlockCursorCB = new BCheckBox("blockCursor", B_TRANSLATE("Use block cursor"), new BMessage((uint32) Actions::BLOCK_CURSOR));
+	fScrollPastEndCB = new BCheckBox("scrollPastEnd", B_TRANSLATE("Allow scrolling past end of file"), new BMessage((uint32) Actions::SCROLL_PAST_END));
 
 	fEditorStyleMenu = new BPopUpMenu("style");
 	fEditorStyleMF = new BMenuField("style", B_TRANSLATE("Style"), fEditorStyleMenu);
@@ -381,6 +386,7 @@ AppPreferencesWindow::_InitInterface()
 		.Add(fFullPathInTitleCB)
 		.Add(fBracesHighlightingCB)
 		.Add(fBlockCursorCB)
+		.Add(fScrollPastEndCB)
 		.Add(fToolbarBox)
 		.AddStrut(B_USE_HALF_ITEM_SPACING)
 		.Add(fLineLimitBox)
@@ -487,6 +493,7 @@ AppPreferencesWindow::_SyncPreferences(Preferences* preferences)
 
 	SetChecked(fBracesHighlightingCB, preferences->fBracesHighlighting);
 	SetChecked(fBlockCursorCB, preferences->fUseBlockCursor);
+	SetChecked(fScrollPastEndCB, preferences->fScrollPastEndOfFile);
 	SetChecked(fAttachNewWindowsCB, preferences->fOpenWindowsInStack);
 	SetChecked(fHighlightTrailingWSCB, preferences->fHighlightTrailingWhitespace);
 	SetChecked(fTrimTrailingWSOnSaveCB, preferences->fTrimTrailingWhitespaceOnSave);

src/preferences/AppPreferencesWindow.h

@@ -78,6 +78,7 @@ class AppPreferencesWindow : public BWindow {
 		USE_CUSTOM_FONT			= 'ucfn',
 		FONT_CHANGED			= 'fnch',
 		FONT_SIZE_CHANGED		= 'fsch',
+		SCROLL_PAST_END			= 'scpe',
 
 		REVERT					= 'rvrt'
 	};
@@ -138,6 +139,7 @@ class AppPreferencesWindow : public BWindow {
 
 	BCheckBox*		fBracesHighlightingCB;
 	BCheckBox*		fBlockCursorCB;
+	BCheckBox*		fScrollPastEndCB;
 
 	BPopUpMenu*		fEditorStyleMenu;
 	BMenuField*		fEditorStyleMF;

src/preferences/Preferences.cpp

@@ -116,6 +116,7 @@ Preferences::Load(const char* filename)
 	fUseEditorconfig = storage.GetBool("useEditorconfig", true);
 	fAlwaysOpenInNewWindow = storage.GetBool("alwaysOpenInNewWindow", false);
 	fUseCustomFont = storage.GetBool("useCustomFont", false);
+	fScrollPastEndOfFile = storage.GetBool("scrollPastEndOfFile", false);
 	fFontFamily = storage.GetString("fontFamily", "Noto Sans Mono");
 	fFontSize = storage.GetUInt8("fontSize", 12);
 	fToolbarIconSizeMultiplier = storage.GetUInt8("toolbarIconSizeMultiplier", 3);
@@ -162,6 +163,7 @@ Preferences::Save(const char* filename)
 	storage.AddBool("alwaysOpenInNewWindow", fAlwaysOpenInNewWindow);
 	storage.AddBool("useEditorconfig", fUseEditorconfig);
 	storage.AddBool("useCustomFont", fUseCustomFont);
+	storage.AddBool("scrollPastEndOfFile", fScrollPastEndOfFile);
 	storage.AddString("fontFamily", fFontFamily.c_str());
 	storage.AddUInt8("fontSize", fFontSize);
 	storage.AddUInt8("toolbarIconSizeMultiplier", fToolbarIconSizeMultiplier);
@@ -206,6 +208,7 @@ Preferences::operator =(Preferences& p)
 	fFindWindowState = p.fFindWindowState;
 	fAlwaysOpenInNewWindow = p.fAlwaysOpenInNewWindow;
 	fUseCustomFont = p.fUseCustomFont;
+	fScrollPastEndOfFile = p.fScrollPastEndOfFile;
 	fFontFamily = p.fFontFamily;
 	fFontSize = p.fFontSize;
 	fToolbarIconSizeMultiplier = p.fToolbarIconSizeMultiplier;

src/preferences/Preferences.h

@@ -59,6 +59,7 @@ class Preferences {
 	bool			fUseEditorconfig;
 	bool			fAlwaysOpenInNewWindow;
 	bool			fUseCustomFont;
+	bool			fScrollPastEndOfFile;
 	std::string		fFontFamily;
 	uint8			fFontSize;
 	uint8			fToolbarIconSizeMultiplier;