Shamusworld >> Repos - architektonas/blob - src/promptlineedit.cpp

   1 //
   2 // promptlineedit.cpp: QLineEdit widget with uneditable (by user) prompt
   3 //
   4 // Part of the Architektonas Project
   5 // (C) 2021 Underground Software
   6 // See the README and GPLv3 files for licensing and warranty information
   7 //
   8 // JLH = James Hammons <jlhamm@acm.org>
   9 //
  10 // WHO  WHEN        WHAT
  11 // ---  ----------  ------------------------------------------------------------
  12 // JLH  11/27/2021  Created this file
  13 //
  14
  15 #include "promptlineedit.h"
  16
  17 PromptLineEdit::PromptLineEdit(QWidget * parent/*= NULL*/): QLineEdit(parent)
  18 {
  19         connect(this, SIGNAL(cursorPositionChanged(int, int)), this, SLOT(HandleCursorMoved(int, int)));
  20         connect(this, SIGNAL(textChanged(const QString &)), this, SLOT(HandleTextChanged(const QString &)));
  21         connect(this, SIGNAL(selectionChanged(void)), this, SLOT(HandleSelectionChanged(void)));
  22
  23         SetPrompt("ATNS");
  24 }
  25
  26 PromptLineEdit::~PromptLineEdit()
  27 {
  28 }
  29
  30 void PromptLineEdit::HandleCursorMoved(int /*old*/, int neu)
  31 {
  32         if (neu < prompt.length())
  33                 setCursorPosition(prompt.length());
  34 }
  35
  36 void PromptLineEdit::HandleTextChanged(const QString & s)
  37 {
  38         if (s.length() == 0)
  39                 setText(prompt);
  40 }
  41
  42 void PromptLineEdit::HandleSelectionChanged(void)
  43 {
  44         int selStart = selectionStart();
  45         int selEnd = selectionEnd();
  46         int promptLen = prompt.length();
  47
  48         if (selStart == -1)
  49                 return;
  50
  51         if (selStart < promptLen)
  52                 setSelection(selEnd, -(selEnd - promptLen));
  53 }
  54
  55 void PromptLineEdit::keyPressEvent(QKeyEvent * event)
  56 {
  57         if (event->key() == Qt::Key_Backspace)
  58         {
  59                 if (cursorPosition() <= prompt.length())
  60                 {
  61                         event->accept();
  62                         return;
  63                 }
  64         }
  65
  66         QLineEdit::keyPressEvent(event);
  67 }
  68
  69 QString PromptLineEdit::text(void) const
  70 {
  71         QString s = QLineEdit::text();
  72
  73         return s.right(s.length() - prompt.length());
  74 }
  75
  76 void PromptLineEdit::SetPrompt(QString s)
  77 {
  78         prompt = s + ": ";
  79         setText(prompt);
  80 }