Continuation Marker feature from Hans Eckardt.

4 files changed, 208 insertions, 16 deletions

diff --git a/src/Document.cxx b/src/Document.cxx
index 25cb0de9f..046a72683 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -57,6 +57,7 @@ Document::Document() {
 	enteredReadOnlyCount = 0;
 	tabInChars = 8;
 	indentInChars = 0;
+	actualIndentInChars = 8;
 	useTabs = true;
 	tabIndents = true;
 	backspaceUnindents = false;
diff --git a/src/Document.h b/src/Document.h
index 18b47eaf5..e31f8e324 100644
--- a/src/Document.h
+++ b/src/Document.h
@@ -116,6 +116,7 @@ public:
 	int dbcsCodePage;
 	int tabInChars;
 	int indentInChars;
+	int actualIndentInChars;
 	bool useTabs;
 	bool tabIndents;
 	bool backspaceUnindents;
@@ -228,6 +229,7 @@ public:
 	int ExtendStyleRange(int pos, int delta, bool singleLine = false);
 	int ParaUp(int pos);
 	int ParaDown(int pos);
+	int IndentSize() { return actualIndentInChars; }
 
 private:
 	charClassification WordCharClass(unsigned char ch);
@@ -239,8 +241,6 @@ private:
 	void NotifyModifyAttempt();
 	void NotifySavePoint(bool atSavePoint);
 	void NotifyModified(DocModification mh);
-
-	int IndentSize() { return indentInChars ? indentInChars : tabInChars; }
 };
 
 /**
diff --git a/src/Editor.cxx b/src/Editor.cxx
index af5caf46d..63a015ce6 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -385,6 +385,10 @@ Editor::Editor() {
 	docLineLastWrapped = -1;
 	docLastLineToWrap = -1;
 	backgroundWrapEnabled = true;
+	wrapVisualFlags = 0;
+	wrapVisualFlagsLocation = 0;
+	wrapVisualStartIndent = 0;
+	actualWrapVisualStartIndent = 0;
 
 	hsStart = -1;
 	hsEnd = -1;
@@ -636,9 +640,16 @@ Point Editor::LocationFromPosition(int pos) {
 		if (posInLine > ll->maxLineLength) {
 			pt.x = ll->positions[ll->maxLineLength] - ll->positions[ll->LineStart(ll->lines)];
 		}
+
 		for (int subLine = 0; subLine < ll->lines; subLine++) {
 			if ((posInLine >= ll->LineStart(subLine)) && (posInLine <= ll->LineStart(subLine + 1))) {
 				pt.x = ll->positions[posInLine] - ll->positions[ll->LineStart(subLine)];
+				if (actualWrapVisualStartIndent != 0) {
+					int lineStart = ll->LineStart(subLine);
+					bool continuedWrapLine = lineStart != 0;
+					if (continuedWrapLine)
+						pt.x += actualWrapVisualStartIndent * vs.aveCharWidth;
+				}
 			}
 			if (posInLine >= ll->LineStart(subLine)) {
 				pt.y += vs.lineHeight;
@@ -691,6 +702,12 @@ int Editor::PositionFromLocation(Point pt) {
 			int lineStart = ll->LineStart(subLine);
 			int lineEnd = ll->LineStart(subLine + 1);
 			int subLineStart = ll->positions[lineStart];
+
+			if (actualWrapVisualStartIndent != 0) {
+				bool continuedWrapLine = lineStart != 0;
+				if (continuedWrapLine)
+					pt.x -= actualWrapVisualStartIndent * vs.aveCharWidth;
+			}
 			for (int i = lineStart; i < lineEnd; i++) {
 				if (pt.x < (((ll->positions[i] + ll->positions[i + 1]) / 2) - subLineStart) ||
 				        IsEOLChar(ll->chars[i])) {
@@ -735,6 +752,12 @@ int Editor::PositionFromLocationClose(Point pt) {
 			int lineStart = ll->LineStart(subLine);
 			int lineEnd = ll->LineStart(subLine + 1);
 			int subLineStart = ll->positions[lineStart];
+
+			if (actualWrapVisualStartIndent != 0) {
+				bool continuedWrapLine = lineStart != 0;
+				if (continuedWrapLine)
+					pt.x -= actualWrapVisualStartIndent * vs.aveCharWidth;
+			}
 			for (int i = lineStart; i < lineEnd; i++) {
 				if (pt.x < (((ll->positions[i] + ll->positions[i + 1]) / 2) - subLineStart) ||
 				        IsEOLChar(ll->chars[i])) {
@@ -767,6 +790,12 @@ int Editor::PositionFromLineX(int lineDoc, int x) {
 		int lineStart = ll->LineStart(subLine);
 		int lineEnd = ll->LineStart(subLine + 1);
 		int subLineStart = ll->positions[lineStart];
+
+		if (actualWrapVisualStartIndent != 0) {
+			bool continuedWrapLine = lineStart != 0;
+			if (continuedWrapLine)
+				x -= actualWrapVisualStartIndent * vs.aveCharWidth;
+		}
 		for (int i = lineStart; i < lineEnd; i++) {
 			if (x < (((ll->positions[i] + ll->positions[i + 1]) / 2) - subLineStart) ||
 			        IsEOLChar(ll->chars[i])) {
@@ -1992,6 +2021,9 @@ void Editor::LayoutLine(int line, Surface *surface, ViewStyle &vstyle, LineLayou
 			// Simple common case where line does not need wrapping.
 			ll->lines = 1;
 		} else {
+			if (wrapVisualFlags & SC_WRAPVISUALFLAG_END) {
+				width -= vstyle.aveCharWidth; // take into account the space for end wrap mark
+			}
 			ll->lines = 0;
 			// Calculate line start positions based upon width.
 			// For now this is simplistic - wraps on byte rather than character and
@@ -2018,6 +2050,8 @@ void Editor::LayoutLine(int line, Surface *surface, ViewStyle &vstyle, LineLayou
 					ll->lines++;
 					ll->SetLineStart(ll->lines, lastGoodBreak);
 					startOffset = ll->positions[lastGoodBreak];
+					// take into account the space for start wrap mark and indent
+					startOffset -= actualWrapVisualStartIndent * vstyle.aveCharWidth;
 					p = lastGoodBreak + 1;
 					continue;
 				}
@@ -2065,9 +2099,56 @@ void Editor::DrawIndentGuide(Surface *surface, int lineVisible, int lineHeight,
 	              highlight ? *pixmapIndentGuideHighlight : *pixmapIndentGuide);
 }
 
+void Editor::DrawWrapMarker(Surface *surface, PRectangle rcPlace,
+                            bool isEndMarker, ColourAllocated wrapColour) {
+	surface->PenColour(wrapColour);
+
+	enum { xa = 1 }; // gap before start
+	int w = rcPlace.right - rcPlace.left - xa - 1;
+
+	bool xStraight = isEndMarker;  // x-mirrored symbol for start marker
+	bool yStraight = true;
+	//bool yStraight= isEndMarker; // comment in for start marker y-mirrowed
+
+	int x0 = xStraight ? rcPlace.left : rcPlace.right - 1;
+	int y0 = yStraight ? rcPlace.top : rcPlace.bottom - 1;
+
+	int dy = (rcPlace.bottom - rcPlace.top) / 5;
+	int y = (rcPlace.bottom - rcPlace.top) / 2 + dy;
+
+	struct Relative {
+		Surface *surface;
+		int xBase;
+		int xDir;
+		int yBase;
+		int yDir;
+		void MoveTo(int xRelative, int yRelative) {
+		    surface->MoveTo(xBase + xDir * xRelative, yBase + yDir * yRelative);
+		}
+		void LineTo(int xRelative, int yRelative) {
+		    surface->LineTo(xBase + xDir * xRelative, yBase + yDir * yRelative);
+		}
+	};
+	Relative rel = {surface, x0, xStraight?1:-1, y0, yStraight?1:-1};
+
+	// arrow head
+	rel.MoveTo(xa, y);
+	rel.LineTo(xa + 2*w / 3, y - dy);
+	rel.MoveTo(xa, y);
+	rel.LineTo(xa + 2*w / 3, y + dy);
+
+	// arrow body
+	rel.MoveTo(xa, y);
+	rel.LineTo(xa + w, y);
+	rel.LineTo(xa + w, y - 2 * dy);
+	rel.LineTo(xa - 1,   // on windows lineto is exclusive endpoint, perhaps GTK not...
+	                y - 2 * dy);
+}
+
 void Editor::DrawEOL(Surface *surface, ViewStyle &vsDraw, PRectangle rcLine, LineLayout *ll,
                      int line, int lineEnd, int xStart, int subLine, int subLineStart,
-                     bool overrideBackground, ColourAllocated background) {
+                     bool overrideBackground, ColourAllocated background,
+                     bool drawWrapMarkEnd, ColourAllocated wrapColour) {
 
 	int styleMask = pdoc->stylingBitsMask;
 	PRectangle rcSegment = rcLine;
@@ -2079,6 +2160,7 @@ void Editor::DrawEOL(Surface *surface, ViewStyle &vsDraw, PRectangle rcLine, Lin
 	int posLineEnd = pdoc->LineStart(line + 1);
 	bool eolInSelection = (subLine == (ll->lines - 1)) &&
 	                      (posLineEnd > ll->selStart) && (posLineEnd <= ll->selEnd) && (ll->selStart != ll->selEnd);
+
 	if (eolInSelection && vsDraw.selbackset && (line < pdoc->LinesTotal() - 1)) {
 		if (primarySelection)
 			surface->FillRectangle(rcSegment, vsDraw.selbackground.allocated);
@@ -2099,6 +2181,20 @@ void Editor::DrawEOL(Surface *surface, ViewStyle &vsDraw, PRectangle rcLine, Lin
 	} else {
 		surface->FillRectangle(rcSegment, vsDraw.styles[STYLE_DEFAULT].back.allocated);
 	}
+
+	if (drawWrapMarkEnd) {
+		PRectangle rcPlace = rcSegment;
+
+		if (wrapVisualFlagsLocation & SC_WRAPVISUALFLAGLOC_END_BY_TEXT) {
+			rcPlace.left = xEol + xStart;
+			rcPlace.right = rcPlace.left + vsDraw.aveCharWidth;
+		} else {
+			// draw left of the right text margin, to avoid clipping by the current clip rect
+			rcPlace.right = rcLine.right - vs.rightMarginWidth;
+			rcPlace.left = rcPlace.right - vsDraw.aveCharWidth;
+		}
+		DrawWrapMarker(surface, rcPlace, true, wrapColour);
+	}
 }
 
 void Editor::DrawLine(Surface *surface, ViewStyle &vsDraw, int line, int lineVisible, int xStart,
@@ -2151,9 +2247,7 @@ void Editor::DrawLine(Surface *surface, ViewStyle &vsDraw, int line, int lineVis
 	                                (!overrideBackground) && (vsDraw.whitespaceBackgroundSet);
 
 	bool inIndentation = subLine == 0;	// Do not handle indentation except on first subline.
-	int indentWidth = pdoc->indentInChars * vsDraw.spaceWidth;
-	if (indentWidth == 0)
-		indentWidth = pdoc->tabInChars * vsDraw.spaceWidth;
+	int indentWidth = pdoc->IndentSize() * vsDraw.spaceWidth;
 
 	int posLineStart = pdoc->LineStart(line);
 
@@ -2165,6 +2259,51 @@ void Editor::DrawLine(Surface *surface, ViewStyle &vsDraw, int line, int lineVis
 		lineStart = ll->LineStart(subLine);
 		lineEnd = ll->LineStart(subLine + 1);
 	}
+
+	bool drawWrapMarkEnd = false;
+
+	if (wrapVisualFlags & SC_WRAPVISUALFLAG_END) {
+		if (subLine + 1 < ll->lines) {
+			drawWrapMarkEnd = ll->LineStart(subLine + 1) != 0;
+		}
+	}
+
+	if (actualWrapVisualStartIndent != 0) {
+
+		bool continuedWrapLine = false;
+		if (subLine < ll->lines) {
+			continuedWrapLine = ll->LineStart(subLine) != 0;
+		}
+
+		if (continuedWrapLine) {
+			// draw continuation rect
+			PRectangle rcPlace = rcSegment;
+
+			rcPlace.left = ll->positions[startseg] + xStart - subLineStart;
+			rcPlace.right = rcPlace.left + actualWrapVisualStartIndent * vsDraw.aveCharWidth;
+
+			// default bgnd here..
+			surface->FillRectangle(rcSegment, vsDraw.styles[STYLE_DEFAULT].back.allocated);
+
+			// main line style would be below but this would be inconsistent with end markers
+			// also would possibly not be the style at wrap point
+			//int styleMain = ll->styles[lineStart];
+			//surface->FillRectangle(rcPlace, vsDraw.styles[styleMain].back.allocated);
+
+			if (wrapVisualFlags & SC_WRAPVISUALFLAG_START) {
+
+				if (wrapVisualFlagsLocation & SC_WRAPVISUALFLAGLOC_START_BY_TEXT)
+					rcPlace.left = rcPlace.right - vsDraw.aveCharWidth;
+				else
+					rcPlace.right = rcPlace.left + vsDraw.aveCharWidth;
+
+				DrawWrapMarker(surface, rcPlace, false, vsDraw.whitespaceForeground.allocated);
+			}
+
+			xStart += actualWrapVisualStartIndent * vsDraw.aveCharWidth;
+		}
+	}
+
 	int i;
 
 	// Background drawing loop
@@ -2222,7 +2361,8 @@ void Editor::DrawLine(Surface *surface, ViewStyle &vsDraw, int line, int lineVis
 
 	if (twoPhaseDraw) {
 		DrawEOL(surface, vsDraw, rcLine, ll, line, lineEnd,
-		        xStart, subLine, subLineStart, overrideBackground, background);
+		        xStart, subLine, subLineStart, overrideBackground, background,
+		        drawWrapMarkEnd, vsDraw.whitespaceForeground.allocated);
 	}
 
 	inIndentation = subLine == 0;	// Do not handle indentation except on first subline.
@@ -2412,10 +2552,10 @@ void Editor::DrawLine(Surface *surface, ViewStyle &vsDraw, int line, int lineVis
 		}
 	}
 	// End of the drawing of the current line
-
 	if (!twoPhaseDraw) {
 		DrawEOL(surface, vsDraw, rcLine, ll, line, lineEnd,
-		        xStart, subLine, subLineStart, overrideBackground, background);
+		        xStart, subLine, subLineStart, overrideBackground, background,
+		        drawWrapMarkEnd, vsDraw.whitespaceForeground.allocated);
 	}
 
 	if (vsDraw.edgeState == EDGE_LINE) {
@@ -2681,7 +2821,7 @@ void Editor::Paint(Surface *surfaceWindow, PRectangle rcArea) {
 					int FoldLevelCurr = (pdoc->GetLevel(lineDoc) & SC_FOLDLEVELNUMBERMASK) - SC_FOLDLEVELBASE;
 					int FoldLevelPrev = (pdoc->GetLevel(lineDoc - 1) & SC_FOLDLEVELNUMBERMASK) - SC_FOLDLEVELBASE;
 					int FoldLevelFlags = (pdoc->GetLevel(lineDoc) & ~SC_FOLDLEVELNUMBERMASK) & ~(0xFFF0000);
-					int indentationStep = (pdoc->indentInChars ? pdoc->indentInChars : pdoc->tabInChars);
+					int indentationStep = pdoc->IndentSize();
 					// Draw line above fold
 					if ((FoldLevelPrev < FoldLevelCurr)
 					        ||
@@ -2719,6 +2859,13 @@ void Editor::Paint(Surface *surfaceWindow, PRectangle rcArea) {
 					if ((offset >= ll->LineStart(subLine)) &&
 					        ((offset < ll->LineStart(subLine + 1)) || offset == ll->numCharsInLine)) {
 						int xposCaret = ll->positions[offset] - ll->positions[ll->LineStart(subLine)] + xStart;
+
+						if (actualWrapVisualStartIndent != 0) {
+							int lineStart = ll->LineStart(subLine);
+							bool continuedWrapLine = lineStart != 0;
+							if (continuedWrapLine)
+								xposCaret += actualWrapVisualStartIndent * vs.aveCharWidth;
+						}
 						int widthOverstrikeCaret;
 						if (posCaret == pdoc->Length())	{   // At end of document
 							widthOverstrikeCaret = vs.aveCharWidth;
@@ -3249,7 +3396,7 @@ void Editor::DelCharBack(bool allowLineStartDeletion) {
 				        pdoc->GetColumn(currentPos) > 0 && pdoc->backspaceUnindents) {
 					pdoc->BeginUndoAction();
 					int indentation = pdoc->GetLineIndentation(lineCurrentPos);
-					int indentationStep = (pdoc->indentInChars ? pdoc->indentInChars : pdoc->tabInChars);
+					int indentationStep = pdoc->IndentSize();
 					if (indentation % indentationStep == 0) {
 						pdoc->SetLineIndentation(lineCurrentPos, indentation - indentationStep);
 					} else {
@@ -4292,8 +4439,7 @@ void Editor::Indent(bool forwards) {
 			if (pdoc->GetColumn(currentPos) <= pdoc->GetColumn(pdoc->GetLineIndentPosition(lineCurrentPos)) &&
 			        pdoc->tabIndents) {
 				int indentation = pdoc->GetLineIndentation(lineCurrentPos);
-				int indentationStep = (pdoc->indentInChars ? pdoc->indentInChars : pdoc->tabInChars);
-				//~ pdoc->SetLineIndentation(lineCurrentPos, indentation + indentationStep);
+				int indentationStep = pdoc->IndentSize();
 				pdoc->SetLineIndentation(lineCurrentPos, indentation + indentationStep - indentation % indentationStep);
 				SetEmptySelection(pdoc->GetLineIndentPosition(lineCurrentPos));
 			} else {
@@ -4317,7 +4463,7 @@ void Editor::Indent(bool forwards) {
 			        pdoc->tabIndents) {
 				pdoc->BeginUndoAction();
 				int indentation = pdoc->GetLineIndentation(lineCurrentPos);
-				int indentationStep = (pdoc->indentInChars ? pdoc->indentInChars : pdoc->tabInChars);
+				int indentationStep = pdoc->IndentSize();
 				pdoc->SetLineIndentation(lineCurrentPos, indentation - indentationStep);
 				SetEmptySelection(pdoc->GetLineIndentPosition(lineCurrentPos));
 				pdoc->EndUndoAction();
@@ -5996,8 +6142,11 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 		break;
 
 	case SCI_SETTABWIDTH:
-		if (wParam > 0)
+		if (wParam > 0) {
 			pdoc->tabInChars = wParam;
+			if (pdoc->indentInChars == 0)
+				pdoc->actualIndentInChars = pdoc->tabInChars;
+		}
 		InvalidateStyleRedraw();
 		break;
 
@@ -6006,6 +6155,10 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 
 	case SCI_SETINDENT:
 		pdoc->indentInChars = wParam;
+		if (pdoc->indentInChars != 0)
+			pdoc->actualIndentInChars = pdoc->indentInChars;
+		else
+			pdoc->actualIndentInChars = pdoc->tabInChars;
 		InvalidateStyleRedraw();
 		break;
 
@@ -6068,6 +6221,38 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 	case SCI_GETWRAPMODE:
 		return wrapState;
 
+	case SCI_SETWRAPVISUALFLAGS:
+		wrapVisualFlags = wParam;
+		actualWrapVisualStartIndent = wrapVisualStartIndent;
+		if ((wrapVisualFlags & SC_WRAPVISUALFLAG_START) && (actualWrapVisualStartIndent == 0))
+			actualWrapVisualStartIndent = 1; // must indent to show start visual
+		InvalidateStyleRedraw();
+		ReconfigureScrollBars();
+		break;
+
+	case SCI_GETWRAPVISUALFLAGS:
+		return wrapVisualFlags;
+
+	case SCI_SETWRAPVISUALFLAGSLOCATION:
+		wrapVisualFlagsLocation = wParam;
+		InvalidateStyleRedraw();
+		break;
+
+	case SCI_GETWRAPVISUALFLAGSLOCATION:
+		return wrapVisualFlagsLocation;
+
+	case SCI_SETWRAPSTARTINDENT:
+		wrapVisualStartIndent = wParam;
+		actualWrapVisualStartIndent = wrapVisualStartIndent;
+		if ((wrapVisualFlags & SC_WRAPVISUALFLAG_START) && (actualWrapVisualStartIndent == 0))
+			actualWrapVisualStartIndent = 1; // must indent to show start visual
+		InvalidateStyleRedraw();
+		ReconfigureScrollBars();
+		break;
+
+	case SCI_GETWRAPSTARTINDENT:
+		return wrapVisualStartIndent;
+
 	case SCI_SETLAYOUTCACHE:
 		llc.SetLevel(wParam);
 		break;
diff --git a/src/Editor.h b/src/Editor.h
index c9c4c26e1..76635e658 100644
--- a/src/Editor.h
+++ b/src/Editor.h
@@ -296,6 +296,10 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	int wrapWidth;
 	int docLineLastWrapped;
 	int docLastLineToWrap;
+	int wrapVisualFlags;
+	int wrapVisualFlagsLocation;
+	int wrapVisualStartIndent;
+	int actualWrapVisualStartIndent;
 
 	Document *pdoc;
 
@@ -368,9 +372,11 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 		int width=LineLayout::wrapWidthInfinite);
 	ColourAllocated TextBackground(ViewStyle &vsDraw, bool overrideBackground, ColourAllocated background, bool inSelection, bool inHotspot, int styleMain, int i, LineLayout *ll);
 	void DrawIndentGuide(Surface *surface, int lineVisible, int lineHeight, int start, PRectangle rcSegment, bool highlight);
+	void DrawWrapMarker(Surface *surface, PRectangle rcPlace, bool isEndMarker, ColourAllocated wrapColour);
 	void DrawEOL(Surface *surface, ViewStyle &vsDraw, PRectangle rcLine, LineLayout *ll,
 		int line, int lineEnd, int xStart, int subLine, int subLineStart,
-		bool overrideBackground, ColourAllocated background);
+		bool overrideBackground, ColourAllocated background,
+		bool drawWrapMark, ColourAllocated wrapColour);
 	void DrawLine(Surface *surface, ViewStyle &vsDraw, int line, int lineVisible, int xStart,
 		PRectangle rcLine, LineLayout *ll, int subLine=0);
 	void RefreshPixMaps(Surface *surfaceWindow);