From cb81cd27cd1b162c381db4106cb29c4c397146a8 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Fri, 5 Apr 2019 08:32:58 +1100
Subject: Backport: Feature [feature-requests:#1272]. Add API to set default
 fold display text.

Backport of changeset 7400:9fcb52fdb307.
---
 doc/ScintillaDoc.html     |  7 +++++++
 doc/ScintillaHistory.html |  5 +++++
 include/Scintilla.h       |  2 ++
 include/Scintilla.iface   |  6 ++++++
 src/ContractionState.cxx  |  8 +-------
 src/ContractionState.h    |  1 -
 src/EditModel.cxx         | 18 ++++++++++++++++++
 src/EditModel.h           |  4 ++++
 src/EditView.cxx          |  7 ++++---
 src/Editor.cxx            |  8 ++++++++
 src/UniqueString.h        |  4 ++++
 test/simpleTests.py       |  5 +++++
 12 files changed, 64 insertions(+), 11 deletions(-)

diff --git a/doc/ScintillaDoc.html b/doc/ScintillaDoc.html
index 127d33694..5d441ff0e 100644
--- a/doc/ScintillaDoc.html
+++ b/doc/ScintillaDoc.html
@@ -5986,6 +5986,8 @@ sptr_t CallScintilla(unsigned int iMessage, uptr_t wParam, sptr_t lParam){
      <a class="message" href="#SCI_TOGGLEFOLDSHOWTEXT">SCI_TOGGLEFOLDSHOWTEXT(int line, const char *text)</a><br />
      <a class="message" href="#SCI_FOLDDISPLAYTEXTSETSTYLE">SCI_FOLDDISPLAYTEXTSETSTYLE(int style)</a><br />
      <a class="message" href="#SCI_FOLDDISPLAYTEXTGETSTYLE">SCI_FOLDDISPLAYTEXTGETSTYLE &rarr; int</a><br />
+     <a class="message" href="#SCI_SETDEFAULTFOLDDISPLAYTEXT">SCI_SETDEFAULTFOLDDISPLAYTEXT(const char *text)</a><br />
+     <a class="message" href="#SCI_GETDEFAULTFOLDDISPLAYTEXT">SCI_GETDEFAULTFOLDDISPLAYTEXT(&lt;unused&gt;, char *text)</a><br />
      <a class="message" href="#SCI_FOLDLINE">SCI_FOLDLINE(int line, int action)</a><br />
      <a class="message" href="#SCI_FOLDCHILDREN">SCI_FOLDCHILDREN(int line, int action)</a><br />
      <a class="message" href="#SCI_FOLDALL">SCI_FOLDALL(int action)</a><br />
@@ -6145,6 +6147,7 @@ sptr_t CallScintilla(unsigned int iMessage, uptr_t wParam, sptr_t lParam){
     <p>An optional text tag may be shown to the right of the folded text with the
     <code class="parameter">text</code> argument to
     <code>SCI_TOGGLEFOLDSHOWTEXT</code>.
+    The default text for all header lines can be set with <code><a class="message" href="#SCI_SETDEFAULTFOLDDISPLAYTEXT">SCI_SETDEFAULTFOLDDISPLAYTEXT</a></code>.
     The text is drawn with the
     <code><a class="message" href="#StyleDefinition">STYLE_FOLDDISPLAYTEXT</a></code> style.</p>
 
@@ -6182,6 +6185,10 @@ sptr_t CallScintilla(unsigned int iMessage, uptr_t wParam, sptr_t lParam){
       </tbody>
     </table>
 
+    <p><b id="SCI_SETDEFAULTFOLDDISPLAYTEXT">SCI_SETDEFAULTFOLDDISPLAYTEXT(const char *text)</b><br />
+     <b id="SCI_GETDEFAULTFOLDDISPLAYTEXT">SCI_GETDEFAULTFOLDDISPLAYTEXT(&lt;unused&gt;, char *text) &rarr; int</b><br />
+     These messages set and get the default text displayed at the right of the folded text.</p>
+
     <p><b id="SCI_SETFOLDEXPANDED">SCI_SETFOLDEXPANDED(int line, bool expanded)</b><br />
      <b id="SCI_GETFOLDEXPANDED">SCI_GETFOLDEXPANDED(int line) &rarr; bool</b><br />
      These messages set and get the expanded state of a single line. The set message has no effect
diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 1a6b34f49..cce4dbdd5 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -572,6 +572,11 @@
  	<li>
 	Avoid potential long hangs with idle styling for huge documents on Cocoa and GTK.
 	</li>
+ 	<li>
+	Set default fold display text SCI_SETDEFAULTFOLDDISPLAYTEXT(text).
+	<a href="https://sourceforge.net/p/scintilla/feature-requests/1272/">Feature #1272</a>.
+	</li>
+    </ul>
     <ul>
        <a href="https://sourceforge.net/projects/scintilla/files/scintilla/3.10.3/scintilla3103.zip/download">Release 3.10.3</a>
     </h3>
diff --git a/include/Scintilla.h b/include/Scintilla.h
index 1845b677a..88610672b 100644
--- a/include/Scintilla.h
+++ b/include/Scintilla.h
@@ -493,6 +493,8 @@ typedef sptr_t (*SciFnDirect)(sptr_t ptr, unsigned int iMessage, uptr_t wParam,
 #define SC_FOLDDISPLAYTEXT_BOXED 2
 #define SCI_FOLDDISPLAYTEXTSETSTYLE 2701
 #define SCI_FOLDDISPLAYTEXTGETSTYLE 2707
+#define SCI_SETDEFAULTFOLDDISPLAYTEXT 2722
+#define SCI_GETDEFAULTFOLDDISPLAYTEXT 2723
 #define SC_FOLDACTION_CONTRACT 0
 #define SC_FOLDACTION_EXPAND 1
 #define SC_FOLDACTION_TOGGLE 2
diff --git a/include/Scintilla.iface b/include/Scintilla.iface
index c2dec218d..d5360a201 100644
--- a/include/Scintilla.iface
+++ b/include/Scintilla.iface
@@ -1239,6 +1239,12 @@ set void FoldDisplayTextSetStyle=2701(int style,)
 # Get the style of fold display text.
 get int FoldDisplayTextGetStyle=2707(,)
 
+# Set the default fold display text.
+fun void SetDefaultFoldDisplayText=2722(, string text)
+
+# Get the default fold display text.
+fun int GetDefaultFoldDisplayText=2723(, stringresult text)
+
 enu FoldAction=SC_FOLDACTION_
 val SC_FOLDACTION_CONTRACT=0
 val SC_FOLDACTION_EXPAND=1
diff --git a/src/ContractionState.cxx b/src/ContractionState.cxx
index c5e352180..47f345ada 100644
--- a/src/ContractionState.cxx
+++ b/src/ContractionState.cxx
@@ -74,7 +74,6 @@ public:
 	bool HiddenLines() const override;
 
 	const char *GetFoldDisplayText(Sci::Line lineDoc) const override;
-	bool GetFoldDisplayTextShown(Sci::Line lineDoc) const override;
 	bool SetFoldDisplayText(Sci::Line lineDoc, const char *text) override;
 
 	bool GetExpanded(Sci::Line lineDoc) const override;
@@ -276,17 +275,12 @@ const char *ContractionState<LINE>::GetFoldDisplayText(Sci::Line lineDoc) const
 	return foldDisplayTexts->ValueAt(lineDoc).get();
 }
 
-template <typename LINE>
-bool ContractionState<LINE>::GetFoldDisplayTextShown(Sci::Line lineDoc) const {
-	return !GetExpanded(lineDoc) && GetFoldDisplayText(lineDoc);
-}
-
 template <typename LINE>
 bool ContractionState<LINE>::SetFoldDisplayText(Sci::Line lineDoc, const char *text) {
 	EnsureData();
 	const char *foldText = foldDisplayTexts->ValueAt(lineDoc).get();
 	if (!foldText || !text || 0 != strcmp(text, foldText)) {
-		UniqueString uns = UniqueStringCopy(text);
+		UniqueString uns = IsNullOrEmpty(text) ? UniqueString() : UniqueStringCopy(text);
 		foldDisplayTexts->SetValueAt(lineDoc, std::move(uns));
 		Check();
 		return true;
diff --git a/src/ContractionState.h b/src/ContractionState.h
index 90f5c0784..f9ec7b645 100644
--- a/src/ContractionState.h
+++ b/src/ContractionState.h
@@ -32,7 +32,6 @@ public:
 	virtual bool HiddenLines() const=0;
 
 	virtual const char *GetFoldDisplayText(Sci::Line lineDoc) const=0;
-	virtual bool GetFoldDisplayTextShown(Sci::Line lineDoc) const=0;
 	virtual bool SetFoldDisplayText(Sci::Line lineDoc, const char *text)=0;
 
 	virtual bool GetExpanded(Sci::Line lineDoc) const=0;
diff --git a/src/EditModel.cxx b/src/EditModel.cxx
index 6288fd1b6..99520f3cb 100644
--- a/src/EditModel.cxx
+++ b/src/EditModel.cxx
@@ -77,3 +77,21 @@ EditModel::~EditModel() {
 	pdoc->Release();
 	pdoc = nullptr;
 }
+
+void EditModel::SetDefaultFoldDisplayText(const char *text) {
+	defaultFoldDisplayText = IsNullOrEmpty(text) ? UniqueString() : UniqueStringCopy(text);
+}
+
+const char *EditModel::GetDefaultFoldDisplayText() const noexcept {
+	return defaultFoldDisplayText.get();
+}
+
+const char *EditModel::GetFoldDisplayText(Sci::Line lineDoc) const {
+	if (foldDisplayTextStyle == SC_FOLDDISPLAYTEXT_HIDDEN || pcs->GetExpanded(lineDoc)) {
+		return nullptr;
+	}
+
+	const char *text = pcs->GetFoldDisplayText(lineDoc);
+	return text ? text : defaultFoldDisplayText.get();
+}
+
diff --git a/src/EditModel.h b/src/EditModel.h
index 5cc9d51d1..ab5c23cdb 100644
--- a/src/EditModel.h
+++ b/src/EditModel.h
@@ -40,6 +40,7 @@ public:
 
 	int foldFlags;
 	int foldDisplayTextStyle;
+	UniqueString defaultFoldDisplayText;
 	std::unique_ptr<IContractionState> pcs;
 	// Hotspot support
 	Range hotspot;
@@ -61,6 +62,9 @@ public:
 	virtual Point GetVisibleOriginInMain() const = 0;
 	virtual Sci::Line LinesOnScreen() const = 0;
 	virtual Range GetHotSpotRange() const noexcept = 0;
+	void SetDefaultFoldDisplayText(const char *text);
+	const char *GetDefaultFoldDisplayText() const noexcept;
+	const char *GetFoldDisplayText(Sci::Line lineDoc) const;
 };
 
 }
diff --git a/src/EditView.cxx b/src/EditView.cxx
index e82f09ee2..fa01a0385 100644
--- a/src/EditView.cxx
+++ b/src/EditView.cxx
@@ -985,7 +985,7 @@ void EditView::DrawEOL(Surface *surface, const EditModel &model, const ViewStyle
 		rcSegment.left = rcLine.left;
 	rcSegment.right = rcLine.right;
 
-	const bool fillRemainder = !lastSubLine || model.foldDisplayTextStyle == SC_FOLDDISPLAYTEXT_HIDDEN || !model.pcs->GetFoldDisplayTextShown(line);
+	const bool fillRemainder = !lastSubLine || !model.GetFoldDisplayText(line);
 	if (fillRemainder) {
 		// Fill the remainder of the line
 		FillLineRemainder(surface, model, vsDraw, ll, line, rcSegment, subLine);
@@ -1105,11 +1105,12 @@ void EditView::DrawFoldDisplayText(Surface *surface, const EditModel &model, con
 	if (!lastSubLine)
 		return;
 
-	if ((model.foldDisplayTextStyle == SC_FOLDDISPLAYTEXT_HIDDEN) || !model.pcs->GetFoldDisplayTextShown(line))
+	const char *text = model.GetFoldDisplayText(line);
+	if (!text)
 		return;
 
 	PRectangle rcSegment = rcLine;
-	const char *foldDisplayText = model.pcs->GetFoldDisplayText(line);
+	const char *foldDisplayText = text;
 	const int lengthFoldDisplayText = static_cast<int>(strlen(foldDisplayText));
 	FontAlias fontText = vsDraw.styles[STYLE_FOLDDISPLAYTEXT].font;
 	const int widthFoldDisplayText = static_cast<int>(surface->WidthText(fontText, foldDisplayText, lengthFoldDisplayText));
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 08a4ac76c..d67f97df7 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -7191,6 +7191,14 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 	case SCI_FOLDDISPLAYTEXTGETSTYLE:
 		return foldDisplayTextStyle;
 
+	case SCI_SETDEFAULTFOLDDISPLAYTEXT:
+		SetDefaultFoldDisplayText(CharPtrFromSPtr(lParam));
+		Redraw();
+		break;
+
+	case SCI_GETDEFAULTFOLDDISPLAYTEXT:
+		return StringResult(lParam, GetDefaultFoldDisplayText());
+
 	case SCI_TOGGLEFOLD:
 		FoldLine(static_cast<Sci::Line>(wParam), SC_FOLDACTION_TOGGLE);
 		break;
diff --git a/src/UniqueString.h b/src/UniqueString.h
index 18c31283e..8d95cb1ab 100644
--- a/src/UniqueString.h
+++ b/src/UniqueString.h
@@ -11,6 +11,10 @@
 
 namespace Scintilla {
 
+constexpr bool IsNullOrEmpty(const char *text) noexcept {
+	return text == nullptr || *text == '\0';
+}
+
 using UniqueString = std::unique_ptr<const char[]>;
 
 /// Equivalent to strdup but produces a std::unique_ptr<const char[]> allocation to go
diff --git a/test/simpleTests.py b/test/simpleTests.py
index b5260c8a8..9a170a2f9 100644
--- a/test/simpleTests.py
+++ b/test/simpleTests.py
@@ -1639,6 +1639,11 @@ class TestStyleAttributes(unittest.TestCase):
 		self.ed.FoldDisplayTextSetStyle(self.ed.SC_FOLDDISPLAYTEXT_BOXED)
 		self.assertEquals(self.ed.FoldDisplayTextGetStyle(), self.ed.SC_FOLDDISPLAYTEXT_BOXED)
 
+	def testDefaultFoldDisplayText(self):
+		self.assertEquals(self.ed.GetDefaultFoldDisplayText(), b"")
+		self.ed.SetDefaultFoldDisplayText(0, b"...")
+		self.assertEquals(self.ed.GetDefaultFoldDisplayText(), b"...")
+
 class TestIndices(unittest.TestCase):
 	def setUp(self):
 		self.xite = Xite.xiteFrame
-- 
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