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05/05/2020

Cadastro de produtos no Java com interface

package cadastro;

/**
 *
 * @author Aluno
 */
import javafx.animation.FadeTransition;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.ChoiceBoxTableCell;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.*;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.io.File;
import java.math.BigDecimal;
import java.util.Optional;
import java.util.regex.Pattern;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.TableColumn.CellEditEvent;
import javafx.stage.FileChooser.ExtensionFilter;

public class TabForm extends Application {

 BorderPane bdp;

 //Área Superior do BorderPane
 Label lblOption, lblKeyword;
 TextField txtKeyword;
 ChoiceBox chbOption; //para escolher por qual campo pesquisar
 HBox pnlSearch;
 FadeTransition ft; //para animar os componentes de busca

 //Área Central do BorderPane
 TabPane tbp; //componente de abas
 Tab tabSearch, tabEdit; //aba de busca e aba de edição
 //Conteúdo da aba de busca
 TableView tbl;
 ContextMenu ctxMenu; //permite ativar menu com botão direito
 MenuItem mnuEdit, mnuDelete; //3 opções de menu do botão direito

 //Conteúdo da Aba de Edição
 GridPane gridEdit; //o formulário será organizado em um Grid (matriz)
 Label lblName, lblQtty, lblPrice, lblType, lblQttyError;
 TextField txtName, txtQtty, txtPrice;
 ChoiceBox chbType;
 final FileChooser fc = new FileChooser(); //para escolher o arquivo da imagem
 Button btnSelectPicture;
 final ImageView imgProduct = new ImageView(); //para exibir a imagem escolhida

 //Área Inferior do BorderPane
 HBox pnlBottom;
 Button btnNew, btnConfirm, btnEdit, btnCancel, btnDelete;

 @SuppressWarnings("unchecked")
 @Override
 public void start(Stage primaryStage) {
   primaryStage.setTitle("Tab Form");
   bdp = new BorderPane();
   Scene scene = new Scene(bdp, 500, 400);

   //Construindo a área superior
   lblKeyword = new Label("Keyword:");
   lblKeyword.setOpacity(0);
   txtKeyword = new TextField();
   txtKeyword.setOpacity(0);
   txtKeyword.setTooltip(new Tooltip("Press ENTER to Search!")); //dica
   txtKeyword.setPromptText("Type what to search here");
   txtKeyword.setPrefColumnCount(13);
   txtKeyword.setStyle(Style.BUTTON);
   txtKeyword.setOnKeyPressed(e -> { txtKeyword_onKeyPressed(e); });
   lblOption= new Label("Option:");
   lblOption.setOpacity(0);
   chbOption = new ChoiceBox();
   chbOption.setOpacity(0);
   chbOption.setOnAction(e -> { chbOption_onAction((ActionEvent) e); });
   chbOption.getItems().addAll("Name", "Type");
   chbOption.getSelectionModel().selectFirst();

   pnlSearch = new HBox(5); //Espaço de 5 px
   pnlSearch.setAlignment(Pos.CENTER);
   pnlSearch.getChildren().addAll(lblKeyword, txtKeyword, lblOption, chbOption);
   pnlSearch.setPadding(new Insets(5));

   ft = new FadeTransition(Duration.millis(700));
   ft.setFromValue(0.0);
   ft.setToValue(1.0);
   ft.setNode(lblKeyword);
   ft.setOnFinished(e->{ ft_onFinished(e); });   

   //Construindo a área inferior
   btnNew = new Button("New");
   btnNew.setStyle(Style.BUTTON);
   btnNew.setOnAction(e -> { btnNew_onAction(e); });
   btnConfirm = new Button("Confirm");
   btnConfirm.setStyle(Style.BUTTON);
   btnConfirm.setOnAction(e -> { btnConfirm_onAction(e); });
   btnEdit = new Button("Edit");
   btnEdit.setTooltip(new Tooltip("Shortcut: CMD+E"));
   btnEdit.setStyle(Style.BUTTON);
   btnEdit.setOnAction(e -> { btnEdit_onAction(e); });
   btnCancel = new Button("Cancel");
   btnCancel.setStyle(Style.BUTTON);
   btnCancel.setOnAction(e -> { btnCancel_onAction(e); });
   btnDelete = new Button("Delete");
   btnDelete.setTooltip(new Tooltip("Shortcut: CMD+D"));
   btnDelete.setStyle(Style.BUTTON);
   btnDelete.setOnAction(e -> { btnDelete_onAction(e); });        

   //Tecla de atalho para realizar busca (CTRL + S)
   scene.getAccelerators().put(
     new KeyCodeCombination(KeyCode.S, KeyCombination.SHORTCUT_DOWN), 
       new Runnable() {
         @Override public void run() {
           txtKeyword.requestFocus();
         }
       }
   );

   //Tecla de atalho para seleção da tabela (CTRL + T)
   scene.getAccelerators().put(
   new KeyCodeCombination(KeyCode.T, KeyCombination.SHORTCUT_DOWN), 
     new Runnable() {
       @Override public void run() {
         tbl.requestFocus();
       }
     }
   );

   //Tecla de atalho para exclusão (CTRL + D)
   scene.getAccelerators().put(
     new KeyCodeCombination(KeyCode.D, KeyCombination.SHORTCUT_DOWN), 
       new Runnable() {
         @Override public void run() {
           btnDelete.fire();
         }
       }
   );

   //Tecla de atalho para edição (CTRL + E)
   scene.getAccelerators().put(
     new KeyCodeCombination(KeyCode.E, KeyCombination.SHORTCUT_DOWN), 
       new Runnable() {
         @Override public void run() {
           btnEdit.fire();
         }
       }
   );

   //botões da parte inferior da interface
   pnlBottom = new HBox(5);
   pnlBottom.setAlignment(Pos.CENTER);
   pnlBottom.getChildren().addAll(btnNew, btnConfirm, btnEdit, btnCancel, btnDelete);
   pnlBottom.setPadding(new Insets(5));

   //Construindo a Aba Busca
   //Lista de produtos que serão exibidos na tabela
   final ObservableList produtos = FXCollections.observableArrayList(
     new Product("Wine",ProductType.BEVERAGE,new BigDecimal(40),10),
     new Product("Soap",ProductType.CLEAN,new BigDecimal(8),5),
     new Product("Cristal Clean",ProductType.CLEAN,new BigDecimal(5),25),
     new Product("Soda",ProductType.BEVERAGE,new BigDecimal(3),43)
   );

   //Configurando a coluna nome do produto
   TableColumn tbcName = new TableColumn<>("Name");
   tbcName.setCellValueFactory(new PropertyValueFactory("name"));

   //permitindo que as células da coluna nome sejam editáveis
   tbcName.setCellFactory(TextFieldTableCell.forTableColumn());
   tbcName.setOnEditCommit(
     new EventHandler<CellEditEvent<Product, String>>() {
       @Override
       public void handle(CellEditEvent<Product, String> t) {
         ((Product) t.getTableView().getItems().get(
           t.getTablePosition().getRow())
         ).setName(t.getNewValue());
       }
     }
   );        

   //Configurando a coluna tipo do produto
   TableColumn tbcType = new TableColumn<>("Type");
   tbcType.setCellValueFactory(new PropertyValueFactory("type"));

   //permitindo que as células da coluna tipo sejam editáveis
 tbcType.setCellFactory(ChoiceBoxTableCell.forTableColumn(ProductType.values()));
   tbcType.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Product,ProductType>>() {
     @Override
     public void handle(CellEditEvent<Product, ProductType> t) {
       ((Product) t.getTableView().getItems().get(
         t.getTablePosition().getRow())
       ).setType(t.getNewValue());    
     }
   });                

   //Configurando a coluna preço do produto
   TableColumn tbcPrice = new TableColumn<>("Price");
   tbcPrice.setCellValueFactory(new PropertyValueFactory("price"));

   //Configurando a coluna qtde do produto
   TableColumn tbcQtty = new TableColumn<>("Qtty");
   tbcQtty.setCellValueFactory(new PropertyValueFactory("qtty"));

   //Configurando a coluna para mostrar a imagem do produto
   TableColumn tbcImg = new TableColumn<>("Image");
   tbcImg.setCellValueFactory(new PropertyValueFactory("img"));

   //Criando a tabela
   tbl = new TableView();
   //Definindo uma dica sobre a possibilidade de usar o botão direito do mouse
   tbl.setTooltip(new Tooltip("Press the right button of the mouse for more options!"));
   tbl.setPrefHeight(300);
   tbl.setItems(produtos); //de onde obterá a lista de produtos

   //adicionando as colunas previamente configuradas
   tbl.getColumns().addAll(tbcName, tbcType, tbcPrice, tbcQtty, tbcImg);
   //não permite o redimensionamento das colunas pelo usuário
   tbl.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

   //Estilo visual da tabela
   tbl.setStyle(Style.TABLE);
   tbl.setOnMouseClicked(e -> { tbl_onMouseClicked(e); });
   tbl.setOnKeyPressed(e -> { tbl_onKeyPressed(e); });
   tbl.setEditable(true); //tabela permite edição

   //Configurando o menu do botão direito do mouse sobre a tabela
   ctxMenu = new ContextMenu();
   mnuEdit = new MenuItem("Edit");
   mnuEdit.setOnAction(e -> { mnuEdit_onAction(e); });
   mnuDelete = new MenuItem("Delete");
   mnuDelete.setOnAction(e -> { mnuDelete_onAction(e); });
   ctxMenu.getItems().addAll(mnuEdit, mnuDelete);
   tbl.setContextMenu(ctxMenu);        

   //Construindo a aba de edição
   lblName = new Label("Name:");
   lblName.setMinWidth(70);
   lblType = new Label("Type:");
   lblQtty = new Label("Qtty:");
   lblQttyError = new Label("");lblQttyError.setTextFill(Color.RED);
   lblQttyError.setStyle("-fx-font-size: 11px;");
   lblPrice = new Label("Price:");

   txtName = new TextField();
   txtName.setPromptText("Product description");
   txtName.setMinWidth(200);
   txtName.setPrefWidth(300);
   chbType = new ChoiceBox<>();
   for (ProductType pt : ProductType.values())
     chbType.getItems().add(pt);
   txtQtty = new TextField();
   txtQtty.setMinWidth(30);
   txtQtty.setPrefWidth(50);
   txtQtty.setMaxWidth(70);

   txtPrice = new TextField();
   txtPrice.setMinWidth(30);
   txtPrice.setPrefWidth(50);
   txtPrice.setMaxWidth(100);

   btnSelectPicture = new Button("Select Picture");
   btnSelectPicture.setOnAction(e -> {
     btnSelect_onPicture(e, primaryStage);
   });

   //Configurando o componente de seleção de imagem
   fc.setTitle("Select Product Image");
   //Somente serão aceitas extensões PNG, JPG e GIF
   fc.getExtensionFilters().addAll(
     new ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif")
   );

   imgProduct.setFitWidth(100);
   imgProduct.setFitHeight(100);
   imgProduct.setPreserveRatio(true); //deve preservar a proporção da imagem

   //Configurando a matriz aonde ficarão os elementos da aba edição
   gridEdit = new GridPane();

   gridEdit.setAlignment(Pos.CENTER);
   gridEdit.setHgap(10); gridEdit.setVgap(10);     
   gridEdit.setPadding(new Insets(25, 25, 25, 25));

   gridEdit.add(lblName, 0, 0); //coluna 0, linha 0
   gridEdit.add(txtName, 1, 0); //coluna 1, linha 0
   gridEdit.add(lblType, 0, 1); //coluna 0, linha 1
   gridEdit.add(chbType, 1, 1); //coluna 1, linha 1
   gridEdit.add(lblQtty, 0, 2); //...
   gridEdit.add(txtQtty, 1, 2);
   gridEdit.add(lblQttyError, 2, 2);
   gridEdit.add(lblPrice, 0, 3);
   gridEdit.add(txtPrice, 1, 3);
   gridEdit.add(btnSelectPicture, 0, 4);
   gridEdit.add(imgProduct, 1, 4);

   //Juntando tudo
   tabSearch = new Tab("Products");
   tabSearch.setOnSelectionChanged(e -> {tabSearch_onSelectionChange(e); });
   tabSearch.setClosable(false);  //aba não permite ser fechada
   tabSearch.setContent(tbl); //conteúdo dessa aba é uma tabela

   tabEdit = new Tab("Edit");
   tabEdit.setOnSelectionChanged(e -> {tabEdit_onSelectionChange(e); });
   tabEdit.setClosable(false); //aba não permite ser fechada
   tabEdit.setContent(gridEdit); //conteúdo dessa aba é um painel

   tbp = new TabPane();
   tbp.getTabs().addAll(tabSearch, tabEdit); //somente duas abas

   bdp.setTop(pnlSearch); //no topo da interface o painel de busca
   bdp.setCenter(tbp);    //no centro o painel com 2 abas
   bdp.setBottom(pnlBottom); //na parte inferior o painel com os botões

   primaryStage.setScene(scene);
   primaryStage.show();
   tbl.requestFocus();
   setEditable(false); //formulário não pode ser editado inicialmente
   ft.play(); //fazendo aparecer gradualmente os componentes de busca
 }

 private void btnSelect_onPicture(ActionEvent e, Stage stage) {
   File f = fc.showOpenDialog(stage);
   if (f != null){
     imgProduct.setImage(new Image(f.toURI().toString()));
   }
 }
 
 //se pressionar ENTER na tabela é como clicar no botão editar
 private void tbl_onKeyPressed(KeyEvent e) {
   if (e.getCode()==KeyCode.ENTER)
     btnEdit.fire();
 }

 //algoritmo da animação do painel de busca (parte superior)
 private void ft_onFinished(ActionEvent e) {
   if (ft.getNode()==lblKeyword) {
     ft.setNode(txtKeyword);
     ft.play();
   }else if (ft.getNode()==txtKeyword) {
     ft.setNode(lblOption);
     ft.play();
   }else if (ft.getNode()==lblOption) {
     ft.setNode(chbOption);
     ft.play();
   }else if(ft.getNode()==chbOption){
     txtKeyword.requestFocus();
   }
 }

 //Verifica se a aba pode ser mudada (em edição não pode)
 private void tabSearch_onSelectionChange(Event e) {
   if (tabSearch.isSelected() && btnNew.isDisabled()) {
     tbp.getSelectionModel().select(tabEdit);
     Alert alert = new Alert(AlertType.INFORMATION);
     alert.setTitle("Information Dialog");
     alert.setHeaderText("Search not Allowed!");
     alert.setContentText("You are editing a register. You have to CONFIRM or CANCEL your operation.");
     alert.showAndWait();
   }
 }

 //quando muda para a aba de edição os campos são preenchidos
 private void tabEdit_onSelectionChange(Event e) {
   if (tabEdit.isSelected()) {
     fillForm();
   }
 }
 
 //Se der um duplo clique na tabela vai para a aba de edição
 private void tbl_onMouseClicked(MouseEvent e) {
   if (e.getClickCount()>=2) {
     tbp.getSelectionModel().select(1);
   }
 }

 private void mnuDelete_onAction(ActionEvent e) {
   btnDelete_onAction(e);
 }

 private void mnuEdit_onAction(ActionEvent e) {
   btnEdit_onAction(e);
 }

 //Se mudar o choice da busca vai para a aba de busca
 private void chbOption_onAction(ActionEvent e) {
   if (tbp!=null) tbp.getSelectionModel().select(0);
 }

 //Se pressionar ENTER na caixa de texto de busca vai para a aba de busca
 private void txtKeyword_onKeyPressed(KeyEvent e) {
   if (e.getCode() == KeyCode.ENTER) {
     tbp.getSelectionModel().select(0);
   }
 }

 private void btnDelete_onAction(ActionEvent e) {
   Alert alert;
   Product p = (Product) tbl.getSelectionModel().getSelectedItem();
   if (p != null) {
     alert = new Alert(AlertType.CONFIRMATION);
     alert.setTitle("Confirmation Dialog");
     alert.setHeaderText("DELETE Dialog");
     alert.setContentText("Are you sure you want to delete it?");

     Optional result = alert.showAndWait();
     if (result.get() == ButtonType.OK){
       tbl.getItems().remove(p);
       clearForm();
     }
   } else {
     alert = new Alert(AlertType.INFORMATION);
     alert.setTitle("Information Dialog");
     alert.setHeaderText("Product not selected!");
     alert.setContentText("You must select a product in the table in order to delete.");
     alert.showAndWait();   
   }
 }

 private void btnCancel_onAction(ActionEvent e) {
   setEditable(false);
   clearForm();
   fillForm();
 }

 private void btnEdit_onAction(ActionEvent e) {
   Alert alert;
   Product p = (Product) tbl.getSelectionModel().getSelectedItem();
   if (p!=null) {
     setEditable(true);
     tbp.getSelectionModel().select(1);
     txtName.requestFocus();
   } else {
     alert = new Alert(AlertType.INFORMATION);
     alert.setTitle("Information Dialog");
     alert.setHeaderText("Product not selected!");
     alert.setContentText("You must select a product in the table in order to edit it.");
     alert.showAndWait();      
   }
 }

 private void btnConfirm_onAction(ActionEvent e) {
  boolean error = false;
  if (!Pattern.matches("[0-9]*\\.?[0-9]*", txtQtty.getText())){
   txtQtty.setStyle(Style.ERROR);
   lblQttyError.setText("Value must be a number >= 0");
   error=true;
   txtQtty.requestFocus();
  }

  if (!error) {
    Product p = (Product) tbl.getSelectionModel().getSelectedItem();
    if (p == null) {
      p = new Product();
      tbl.getItems().add(p);
    }
    p.setName(txtName.getText());
    p.setPrice(new BigDecimal(txtPrice.getText()));
    p.setQtty(new Float(txtPrice.getText()));
    p.setType((ProductType) chbType.getSelectionModel().getSelectedItem());
    ImageView iv = new ImageView(imgProduct.getImage());
    iv.setFitWidth(100);
    iv.setFitHeight(100);
    iv.setPreserveRatio(true);
    p.setImg(iv);
    clearForm();
    setEditable(false);
    tbl.refresh();
    tbp.getSelectionModel().select(0);
    tbl.requestFocus();
    tbl.getSelectionModel().select(p);
  }
 }

 private void btnNew_onAction(ActionEvent e) {
   setEditable(true);
   tbp.getSelectionModel().select(1);
   clearForm();
   txtName.requestFocus();
   tbl.getSelectionModel().select(null);
 }

 public void setEditable(boolean edit) {
   btnNew.setDisable(edit);
   btnConfirm.setDisable(!edit);
   btnEdit.setDisable(edit);
   btnCancel.setDisable(!edit);
   btnDelete.setDisable(edit);
   gridEdit.setDisable(!edit);
 }

 public void clearForm() {
   txtName.setText("");
   txtQtty.setText("");
   txtPrice.setText("");
   chbType.getSelectionModel().select(-1);
   txtName.setStyle("");
   txtQtty.setStyle("");
   txtPrice.setStyle("");
   //imgProduct.setImage(null); it doesn't work properly
   lblQttyError.setText("");
 }

 public void fillForm() {
  Product p = (Product) tbl.getSelectionModel().getSelectedItem();
  if (p!=null) {
   txtName.setText(p.getName());
   txtQtty.setText(p.getQtty()+"");
   txtPrice.setText(p.getPrice().toString());
   chbType.getSelectionModel().select(p.getType());
   imgProduct.setImage(p.getImg().getImage());
  }
 }

    public static void main(String[] args) {
        Application.launch(args);
    }

 public static class Product {
     private String name;
     private ProductType type;
     private BigDecimal price;
     private float qtty;
     private ImageView img = new ImageView(new Image(getClass().getResourceAsStream("search.png")));

     public Product() {}
     public Product(String name, ProductType type, BigDecimal price, float qtty) {
      this.name = name;
      this.type = type;
      this.price = price;
      this.qtty = qtty;
     }

  public String getName() {
   return name;
  }

  public void setName(String name) {
   this.name = name;
  }

  public ProductType getType() {
   return type;
  }

  public void setType(ProductType type) {
   this.type = type;
  }

  public BigDecimal getPrice() {
   return price;
  }

  public void setPrice(BigDecimal price) {
   this.price = price;
  }

  public float getQtty() {
   return qtty;
  }

  public void setQtty(float qtty) {
   this.qtty = qtty;
  }

  @Override
  public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((name == null) ? 0 : name.hashCode());
   result = prime * result + ((type == null) ? 0 : type.hashCode());
   return result;
  }

  @Override
  public boolean equals(Object obj) {
   if (this == obj)
    return true;
   if (obj == null)
    return false;
   if (getClass() != obj.getClass())
    return false;
   Product other = (Product) obj;
   if (name == null) {
    if (other.name != null)
     return false;
   } else if (!name.equals(other.name))
    return false;
   if (type != other.type)
    return false;
   return true;
  }

  public String toString() {
      return "Product: " + name;
  }
  public ImageView getImg() {
   return img;
  }
  public void setImg(ImageView img) {
   this.img = img;
  }
}

public static enum ProductType {
  BEVERAGE, CLEAN, FOOD
}

public static class Style {
  public static final String BUTTON = "-fx-background-color: linear-gradient(#ffd65b, #e68400), linear-gradient(#ffef84, #f2ba44), linear-gradient(#ffea6a, #efaa22), linear-gradient(#ffe657 0%, #f8c202 50%, #eea10b 100%), linear-gradient(from 0% 0% to 15% 50%, rgba(255,255,255,0.9), rgba(255,255,255,0)); -fx-background-radius: 10;   -fx-background-insets: 0,1,2,3,0;  -fx-text-fill: #654b00;     -fx-font-weight: bold;     -fx-font-size: 12px;     -fx-padding: 10 10 10 10;";
  public static final String ERROR = "-fx-background-color: red,linear-gradient(to bottom, derive(red,60%) 5%,derive(red,90%) 40%);";
  public static final String TABLE = "-fx-selection-bar: orange; -fx-selection-bar-non-focused: moccasin;";
 }
    
}

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