AutoFiltro.java

/*
Copyright 2012-2017 Jose Robson Mariano Alves

This file is part of bgfinancas.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This package is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

 */
package badernageral.bgfinancas.biblioteca.utilitario;

import badernageral.bgfinancas.biblioteca.contrato.Categoria;
import badernageral.bgfinancas.biblioteca.contrato.Item;
import badernageral.bgfinancas.idioma.Linguagem;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.control.ComboBox;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;

public final class AutoFiltro<T extends Categoria> implements EventHandler<KeyEvent> {

    private final ComboBox<T> comboBox;
    private ObservableList<T> itens;
    private ObservableList<T> lista_itens;
    private Boolean moverCursor = false;
    private int posicaoCursor;

    public AutoFiltro(ComboBox<T> comboBox) {
        this.comboBox = comboBox;
        this.comboBox.setPromptText(Linguagem.getInstance().getMensagem("autofiltro"));
        itens = this.comboBox.getItems();
        this.comboBox.setEditable(true);
        this.comboBox.setOnAction(e -> {
            String texto = this.comboBox.getEditor().getText();
            if (!texto.equals("") && !texto.contains("(")) {
                if (this.getItem() != null) {
                    this.comboBox.getEditor().setText(this.getItem().toString());
                }
            }
        });
        this.comboBox.setOnKeyPressed((KeyEvent ke) -> {
            this.comboBox.hide();
        });
        this.comboBox.setOnHiding((event) -> {
            atualizar(false);
        });
        this.comboBox.setOnKeyReleased(AutoFiltro.this);
        this.comboBox.getStyleClass().add("AutoFiltro");
    }

    public void atualizarItens() {
        itens = this.comboBox.getItems();
    }

    public T getItem() {
        if (comboBox.getSelectionModel().getSelectedItem() instanceof Item) {
            T item = comboBox.getSelectionModel().getSelectedItem();
            if (item != null) {
                return item;
            } else {
                return null;
            }
        } else if (comboBox.getItems().size() > 0) {
            T item = null;
            if (!comboBox.getEditor().getText().equals("")) {
                item = comboBox.getItems().get(0);
            }
            if (item != null) {
                return item;
            } else {
                return null;
            }
        } else {
            return null;
        }
    }

    @Override
    public void handle(KeyEvent eventoTecla) {
        if (eventoTecla.getCode() == KeyCode.RIGHT || eventoTecla.getCode() == KeyCode.LEFT
                || eventoTecla.getCode() == KeyCode.HOME || eventoTecla.getCode() == KeyCode.END
                || eventoTecla.getCode() == KeyCode.TAB || eventoTecla.isControlDown()
                || eventoTecla.getCode() == KeyCode.ENTER || eventoTecla.getCode() == KeyCode.CONTROL
                || eventoTecla.getCode() == KeyCode.SHIFT) {
            return;
        } else if (eventoTecla.getCode() == KeyCode.UP || eventoTecla.getCode() == KeyCode.DOWN) {
            if (!comboBox.isShowing()) {
                comboBox.show();
            }
            posicaoCursor = -1;
            moverCursor(comboBox.getEditor().getText().length());
            return;
        } else if (eventoTecla.getCode() == KeyCode.BACK_SPACE || eventoTecla.getCode() == KeyCode.DELETE) {
            moverCursor = true;
            posicaoCursor = comboBox.getEditor().getCaretPosition();
        }
        atualizar(true);
    }

    public void atualizar(boolean exibirLista) {
        String filtro = Outros.removerAcentos(comboBox.getEditor().getText().toLowerCase());
        lista_itens = Lista.filtrar(filtro, itens);
        lista_itens = Lista.ordenar(filtro, lista_itens);
        comboBox.setItems(lista_itens);
        comboBox.getEditor().setText(comboBox.getEditor().getText());
        if (!moverCursor) {
            posicaoCursor = -1;
        }
        moverCursor(filtro.length());
        if (!lista_itens.isEmpty() && exibirLista) {
            comboBox.show();
        }
    }

    private void moverCursor(int posicao) {
        if (posicaoCursor == -1) {
            comboBox.getEditor().positionCaret(posicao);
        } else {
            comboBox.getEditor().positionCaret(posicaoCursor);
        }
        moverCursor = false;
    }

}