Method DeleteSelection

GUI/RichTextarea.cpp:1536–1624

Remove characters in active selection

// Remove characters in active selection
void TextareaData::DeleteSelection()
{
	// Selection must be active
	if(!selectionOn)
		return;

	// Sort selection points
	unsigned int startX, startY, endX, endY;
	SortSelPoints(startX, endX, startY, endY);

	// If both points are outside the text, exit
	if(startY > lineCount && endY > lineCount)
	{
		selectionOn = false;
		return;
	}
	// Clamp selection points in Y axis
	startY = startY > lineCount ? lineCount - 1 : startY;
	endY = endY > lineCount ? lineCount-1 : endY;

	// Find first selection line
	AreaLine *first = firstLine;
	for(unsigned int i = 0; i < startY; i++)
		first = first->next;

	history->TakeSnapshot(first, HistoryManager::LINES_DELETED, (endY - startY)+1);

	// For single-line selection
	if(startY == endY)
	{
		// Clamp selection points in Z axis
		endX = endX > first->length ? first->length : endX;
		startX = startX > first->length ? first->length : startX;
		// Move text after selection to the start of selection
		memmove(&first->data[startX], &first->data[endX], (first->length - endX) * sizeof(AreaChar));
		// Shrink length
		first->length -= endX - startX;
		// Move cursor and disable selection mode
		cursorCharX = startX;
		selectionOn = false;
	}else{	// For multi-line selection
		// Find last selection line
		AreaLine *last = first;
		for(unsigned int i = startY; i < endY; i++)
			last = last->next;

		// Shrink first line
		first->length = startX > first->length ? first->length : startX;

		// Move cursor to starting position
		cursorCharX = first->length;
		cursorCharY = startY;

		// Clamp ending X position
		endX = endX > last->length ? last->length : endX;

		// Move unselected part of last line to the beginning if the line
		memmove(&last->data[0], &last->data[endX], (last->length - endX) * sizeof(AreaChar));