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//===========================================
// Lumina-DE source code
// Copyright (c) 2015, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
#include "PlainTextEditor.h"
#include <QColor>
#include <QPainter>
#include <QTextBlock>
#include <QFileDialog>
#include <LuminaUtils.h>
//==============
// PUBLIC
//==============
PlainTextEditor::PlainTextEditor(QWidget *parent) : QPlainTextEdit(parent){
LNW = new LNWidget(this);
showLNW = true;
hasChanges = false;
matchleft = matchright = -1;
SYNTAX = new Custom_Syntax(this->document());
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()) );
connect(this, SIGNAL(textChanged()), this, SLOT(textChanged()) );
LNW_updateWidth();
LNW_highlightLine();
}
PlainTextEditor::~PlainTextEditor(){
}
void PlainTextEditor::showLineNumbers(bool show){
showLNW = show;
LNW->setVisible(show);
LNW_updateWidth();
}
void PlainTextEditor::LoadSyntaxRule(QString type){
SYNTAX->loadRules(type);
SYNTAX->rehighlight();
}
//File loading/setting options
void PlainTextEditor::LoadFile(QString filepath){
this->setWhatsThis(filepath);
this->clear();
SYNTAX->loadRules( Custom_Syntax::ruleForFile(filepath.section("/",-1)) );
this->setPlainText( LUtils::readFile(filepath).join("\n") );
hasChanges = false;
emit FileLoaded(this->whatsThis());
}
void PlainTextEditor::SaveFile(bool newname){
if( !this->whatsThis().startsWith("/") || newname ){
//prompt for a filename/path
QString file = QFileDialog::getSaveFileName(this, tr("Save File"), this->whatsThis(), tr("Text File (*)"));
if(file.isEmpty()){ return; }
else{ this->setWhatsThis(file); }
}
bool ok = LUtils::writeFile(this->whatsThis(), this->toPlainText().split("\n"), true);
if(ok){ emit FileLoaded(this->whatsThis()); }
SYNTAX->loadRules( Custom_Syntax::ruleForFile(this->whatsThis().section("/",-1)) );
SYNTAX->rehighlight();
}
QString PlainTextEditor::currentFile(){
return this->whatsThis();
}
bool PlainTextEditor::hasChange(){
return hasChanges;
}
//Functions for managing the line number widget
int PlainTextEditor::LNWWidth(){
//Get the number of chars we need for line numbers
int lines = this->blockCount();
if(lines<1){ lines = 1; }
int chars = 1;
while(lines>=10){ chars++; lines/=10; }
return (this->fontMetrics().width("9")*chars + 4); //make sure to add a tiny bit of padding
}
void PlainTextEditor::paintLNW(QPaintEvent *ev){
QPainter P(LNW);
//First set the background color
P.fillRect(ev->rect(), QColor("lightgrey"));
//Now determine which line numbers to show (based on the current viewport)
QTextBlock block = this->firstVisibleBlock();
int bTop = blockBoundingGeometry(block).translated(contentOffset()).top();
int bBottom;
//Now loop over the blocks (lines) and write in the numbers
P.setPen(Qt::black); //setup the font color
while(block.isValid() && bTop<=ev->rect().bottom()){ //ensure block below top of viewport
bBottom = bTop+blockBoundingRect(block).height();
if(block.isVisible() && bBottom >= ev->rect().top()){ //ensure block above bottom of viewport
P.drawText(0,bTop, LNW->width(), this->fontMetrics().height(), Qt::AlignRight, QString::number(block.blockNumber()+1) );
}
//Go to the next block
block = block.next();
bTop = bBottom;
}
}
//==============
// 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
//===================
//Functions for managing the line number widget
void PlainTextEditor::LNW_updateWidth(){
if(showLNW){
this->setViewportMargins( LNWWidth(), 0, 0, 0); //the LNW is contained within the left margin
}else{
this->setViewportMargins( 0, 0, 0, 0); //the LNW is contained within the left margin
}
}
void PlainTextEditor::LNW_highlightLine(){
if(this->isReadOnly()){ return; }
QColor highC = QColor(0,0,0,50); //just darken the line a bit
QTextEdit::ExtraSelection sel;
sel.format.setBackground(highC);
sel.format.setProperty(QTextFormat::FullWidthSelection, true);
sel.cursor = this->textCursor();
sel.cursor.clearSelection(); //just in case it already has one
setExtraSelections( QList<QTextEdit::ExtraSelection>() << sel );
}
void PlainTextEditor::LNW_update(const QRect &rect, int dy){
if(dy!=0){ LNW->scroll(0,dy); } //make sure to scroll the line widget the same amount as the editor
else{
//Some other reason we need to repaint the widget
LNW->update(0,rect.y(), LNW->width(), rect.height()); //also repaint the LNW in the same area
}
if(rect.contains(this->viewport()->rect())){
//Something in the currently-viewed area needs updating - make sure the LNW width is still correct
LNW_updateWidth();
}
}
//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); }
else if(ch==QChar('[')){ highlightMatch(QChar(']'),true, pos); }
else if(ch==QChar(']')){ highlightMatch(QChar('['),false, pos); }
}
//Functions for notifying the parent widget of changes
void PlainTextEditor::textChanged(){
if(!hasChanges){
hasChanges = true;
emit UnsavedChanges( this->whatsThis() );
}
}
//==================
// PROTECTED
//==================
void PlainTextEditor::resizeEvent(QResizeEvent *ev){
QPlainTextEdit::resizeEvent(ev); //do the normal resize processing
//Now re-adjust the placement of the LNW (within the left margin area)
QRect cGeom = this->contentsRect();
LNW->setGeometry( QRect(cGeom.left(), cGeom.top(), LNWWidth(), cGeom.height()) );
}
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