Class: Cosmos::RubyEditor

Inherits:
CompletionTextEdit show all
Defined in:
lib/cosmos/gui/text/ruby_editor.rb

Defined Under Namespace

Classes: LineNumberArea, RubySyntax

Constant Summary collapse

CHAR_57 = 
Qt::Char.new(57)

Constants inherited from CompletionTextEdit

CompletionTextEdit::SELECTION_DETAILS_POOL, CompletionTextEdit::TRUE_VARIANT

Constants inherited from Qt::PlainTextEdit

Qt::PlainTextEdit::AMP, Qt::PlainTextEdit::BLANK, Qt::PlainTextEdit::BREAK, Qt::PlainTextEdit::GT, Qt::PlainTextEdit::LT, Qt::PlainTextEdit::NBSP

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from CompletionTextEdit

#highlight_line, #indent_selection, #keyPressCallback=, #keyPressEvent, #rehighlight, #stop_highlight, #unindent_selection

Methods inherited from Qt::PlainTextEdit

#addText, #add_formatted_text, #appendText, #flush, #selected_lines, #selection_end_line, #selection_start_line

Constructor Details

#initialize(parent) ⇒ RubyEditor

Returns a new instance of RubyEditor.



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 157

def initialize(parent)
  super(parent)
  font = Cosmos.get_default_font
  setFont(font)
  @fontMetrics = Cosmos.getFontMetrics(font)

  # This is needed so text searching highlights correctly
  setStyleSheet("selection-background-color: lightblue; selection-color: black;")

  @breakpoints = []
  @enable_breakpoints = false

  # RubySyntax works but slows down the GUI significantly when
  # pasting a large (10k line) block of code into the editor
  @syntax = RubySyntax.new(document())
  @lineNumberArea = LineNumberArea.new(self)

  connect(self, SIGNAL('blockCountChanged(int)'), self, SLOT('line_count_changed()'))
  connect(self, SIGNAL('updateRequest(const QRect &, int)'), self, SLOT('update_line_number_area(const QRect &, int)'))

  line_count_changed()
end

Instance Attribute Details

#enable_breakpoints ⇒ Object

Returns the value of attribute enable_breakpoints.



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 28

def enable_breakpoints
  @enable_breakpoints
end

Instance Method Details

#add_breakpoint(line) ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 197

def add_breakpoint(line)
  @breakpoints << line
  @lineNumberArea.repaint
end

#clear_breakpoint(line) ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 202

def clear_breakpoint(line)
  @breakpoints.delete(line)
  @lineNumberArea.repaint
end

#clear_breakpoints ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 207

def clear_breakpoints
  @breakpoints = []
  @lineNumberArea.repaint
end

#comment_or_uncomment_lines ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 212

def comment_or_uncomment_lines
  cursor = textCursor
  no_selection = cursor.hasSelection ? false : true

  # Start the edit block so this can be all undone with a single undo step
  cursor.beginEditBlock
  selection_end = cursor.selectionEnd
  # Initially place the cursor at the beginning of the selection
  # If nothing is selected this will just put the cursor at the beginning
  # of the current line
  cursor.setPosition(textCursor.selectionStart)
  cursor.movePosition(Qt::TextCursor::StartOfLine)
  result = true
  while (cursor.position < selection_end && result == true) || (no_selection)
    # Check for a special comment
    if cursor.block.text =~ /^\S*#~/
      cursor.deleteChar
      cursor.deleteChar
      # Since we deleted two spaces we need to move the end position by two
      selection_end -= 2
    else
      cursor.insertText("#~")
      # Since we deleted two spaces we need to move the end position by two
      selection_end += 2
    end
    # Move the cursor to the beginning of the next line
    cursor.movePosition(Qt::TextCursor::StartOfLine)
    result = cursor.movePosition(Qt::TextCursor::Down)
    # If nothing was selected then its a single line so break
    break if no_selection
  end
  cursor.endEditBlock
end

#context_menu(point) ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 186

def context_menu(point)
  menu = createStandardContextMenu()
  return menu unless @enable_breakpoints

  menu.addSeparator()
  menu.addAction(create_add_breakpoint_action(point))
  menu.addAction(create_clear_breakpoint_action(point))
  menu.addAction(create_clear_all_breakpoints_action())
  menu
end

#dispose ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 180

def dispose
  super()
  @syntax.dispose
  @lineNumberArea.dispose
end

#line_number_area_paint_event(event) ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 258

def line_number_area_paint_event(event)
  painter = Qt::Painter.new(@lineNumberArea)
  # Check for weird bad initialization conditions
  if painter.isActive and not painter.paintEngine.nil?
    event_rect = event.rect()
    painter.fillRect(event_rect, Qt::lightGray)

    block = firstVisibleBlock()
    blockNumber = block.blockNumber()

    top, bottom = block_top_and_bottom(block)

    width = @lineNumberArea.width()
    height = @fontMetrics.height()
    ellipse_width = @fontMetrics.width(CHAR_57)
    painter.setPen(Cosmos::BLACK)
    while (block.isValid() and top <= event_rect.bottom())
      if (block.isVisible() and bottom >= event_rect.top())
        number = blockNumber + 1
        painter.drawText(0,               # x
                         top,             # y
                         width,           # width
                         height,          # height
                         Qt::AlignRight,  # flags
                         number.to_s)     # text

        if @enable_breakpoints and @breakpoints.include?(number)
          painter.setBrush(Cosmos::RED)
          painter.drawEllipse(2,
                              top+2,
                              ellipse_width,
                              ellipse_width)
        end
      end

      next_block = block.next()
      block.dispose
      block = next_block
      top = bottom
      rect = blockBoundingRect(block)
      bottom = top + rect.height()
      rect.dispose
      blockNumber += 1
    end
    block.dispose
    block = nil
    event_rect.dispose
    event_rect = nil
  end
  # Ensure the painter is disposed in the paint function to avoid this:
  #   QPaintDevice: Cannot destroy paint device that is being painted
  painter.dispose
  painter = nil
end

#resizeEvent(e) ⇒ Object 



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# File 'lib/cosmos/gui/text/ruby_editor.rb', line 246

def resizeEvent(e)
  super(e)
  cr = self.contentsRect()
  rect = Qt::Rect.new(cr.left(),
    cr.top(),
    line_number_area_width(),
    cr.height())
  @lineNumberArea.setGeometry(rect)
  cr.dispose
  rect.dispose
end