From 6061038a2ecb8aab83ec5d3285828185841857c7 Mon Sep 17 00:00:00 2001
From: Ken Moore <moorekou@gmail.com>
Date: Fri, 15 Apr 2016 10:42:11 -0400
Subject: Get parenthesis/bracket highlighting into the text edit - now all the
 basics are covered.

---
 .../lumina-textedit/PlainTextEditor.cpp            | 62 ++++++++++++++++++++++
 .../lumina-textedit/PlainTextEditor.h              |  7 +++
 2 files changed, 69 insertions(+)

(limited to 'desktop-utilities/lumina-textedit')

diff --git a/desktop-utilities/lumina-textedit/PlainTextEditor.cpp b/desktop-utilities/lumina-textedit/PlainTextEditor.cpp
index 7b105d20..adfa4d8a 100644
--- a/desktop-utilities/lumina-textedit/PlainTextEditor.cpp
+++ b/desktop-utilities/lumina-textedit/PlainTextEditor.cpp
@@ -16,9 +16,11 @@
 PlainTextEditor::PlainTextEditor(QWidget *parent) : QPlainTextEdit(parent){
   LNW = new LNWidget(this);
   showLNW = true;
+  matchleft = matchright = -1;
   connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(LNW_updateWidth()) );
   connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(LNW_highlightLine()) );
   connect(this, SIGNAL(updateRequest(const QRect&, int)), this, SLOT(LNW_update(const QRect&, int)) );
+  connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(checkMatchChar()) );
 	
   LNW_updateWidth();
   LNW_highlightLine();
@@ -67,6 +69,55 @@ void PlainTextEditor::paintLNW(QPaintEvent *ev){
 //==============
 //       PRIVATE
 //==============
+void PlainTextEditor::clearMatchData(){
+  if(matchleft>=0 || matchright>=0){
+    QList<QTextEdit::ExtraSelection> sel = this->extraSelections();
+    for(int i=0; i<sel.length(); i++){
+      if(sel[i].cursor.selectedText().length()==1){ sel.takeAt(i); i--; }
+    }
+    this->setExtraSelections(sel);
+    matchleft = -1;
+    matchright = -1;
+  }
+}
+
+void PlainTextEditor::highlightMatch(QChar ch, bool forward, int fromPos){
+  if(forward){ 
+    matchleft = fromPos; 
+    QTextCursor cur = this->document()->find(ch, fromPos);
+    if(!cur.isNull()){ matchright = cur.position(); }
+  }else{ 
+    matchright = fromPos; 
+    QTextCursor cur = this->document()->find(ch, fromPos, QTextDocument::FindBackward);
+    if(!cur.isNull()){ matchleft = cur.position(); }	  
+  }
+  
+  //Now highlight the two characters
+  QList<QTextEdit::ExtraSelection> sels = this->extraSelections();	
+  if(matchleft>=0){ 
+    QTextEdit::ExtraSelection sel;
+    if(matchright>=0){ sel.format.setBackground(Qt::darkGreen); }
+    else{ sel.format.setBackground(Qt::darkRed); }
+    QTextCursor cur = this->textCursor();
+      cur.setPosition(matchleft);
+      if(forward){ cur.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor); }
+      else{ cur.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor); }
+    sel.cursor = cur;
+    sels << sel;
+  }
+  if(matchright>=0){
+    QTextEdit::ExtraSelection sel;
+    if(matchleft>=0){ sel.format.setBackground(Qt::darkGreen); }
+    else{ sel.format.setBackground(Qt::darkRed); }
+    QTextCursor cur = this->textCursor();
+      cur.setPosition(matchright);
+      if(!forward){ cur.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor); }
+      else{ cur.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor); }
+    sel.cursor = cur;
+    sels << sel;	  
+  }
+  this->setExtraSelections(sels);
+}
 
 //===================
 //       PRIVATE SLOTS
@@ -103,6 +154,17 @@ void PlainTextEditor::LNW_update(const QRect &rect, int dy){
   }
 }
 
+//Function for running the matching routine
+void PlainTextEditor::checkMatchChar(){
+  clearMatchData();
+  int pos = this->textCursor().position();
+  QChar ch = this->document()->characterAt(pos);
+  if(ch==QChar('(')){ highlightMatch(QChar(')'),true, pos); }
+  else if(ch==QChar(')')){ highlightMatch(QChar('('),false, pos); }
+  else if(ch==QChar('{')){ highlightMatch(QChar('}'),true, pos); }
+  else if(ch==QChar('}')){ highlightMatch(QChar('{'),false, pos); }
+}
+
 //==================
 //       PROTECTED
 //==================
diff --git a/desktop-utilities/lumina-textedit/PlainTextEditor.h b/desktop-utilities/lumina-textedit/PlainTextEditor.h
index 46841e59..81574b32 100644
--- a/desktop-utilities/lumina-textedit/PlainTextEditor.h
+++ b/desktop-utilities/lumina-textedit/PlainTextEditor.h
@@ -30,11 +30,18 @@ private:
 	QWidget *LNW; //Line Number Widget
 	bool showLNW;
 
+	//Bracket/Perentheses matching functions
+	int matchleft, matchright; //positions within the document
+	void clearMatchData();
+	void highlightMatch(QChar ch, bool forward, int fromPos);
+
 private slots:
 	//Functions for managing the line number widget
 	void LNW_updateWidth();  	// Tied to the QPlainTextEdit::blockCountChanged() signal
 	void LNW_highlightLine();  		// Tied to the QPlainTextEdit::cursorPositionChanged() signal
 	void LNW_update(const QRect&, int); 	// Tied to the QPlainTextEdit::updateRequest() signal
+	//Function for running the matching routine
+	void checkMatchChar();
 
 protected:
 	void resizeEvent(QResizeEvent *ev);
-- 
cgit