@Override
	public void saisirTexte(String s) { 
		if(this.selection.getLongueur() > 0) {
			this.buffer.effacer(this.selection.getDebut(), this.selection.getFin());
			this.selection.setFin(this.selection.getDebut());
		}
		this.buffer.inserer(s, this.selection.getDebut());
		this.selection.setDebut(this.selection.getDebut()+1);
		this.selection.setFin(this.selection.getDebut());
		this.setChanged();
		this.notifyObservers(this.buffer.getContenu());
		this.setChanged();
		this.notifyObservers(this.selection.getDebut());
	}