我试图进行一些下载并在我的表格中显示进度:
要做到这一点我使用以下类:
public class DownloadDataTable {
private SimpleDoubleProperty progress;
private SimpleStringProperty type;
private SimpleStringProperty status;
public DownloadDataTable(double progress, String type, String status) {
this.progress = new SimpleDoubleProperty(progress);
this.type = new SimpleStringProperty(type);
this.status = new SimpleStringProperty(status);
}
public double getProgress() {
return progress.get();
}
public void setProgress(double progress) {
this.progress.set(progress);
}
public String getType() {
String retorno;
if (type==null){
retorno="";
}else{
retorno=type.get();
}
return retorno;
}
public void setType (String type) {
this.type.set(type);
}
public String getStatus(){
String retorno;
if (status==null){
retorno="";
} else{
retorno=status.get();
}
return retorno;
}
public void setStatus(String status){
this.status.set(status);
}
}
并创建了TitledPane,tableview和列表,我这样做:
public void addDownloadToTitledPane(DownloadContent downloadContent) {
MetaDados metaDado = downloadContent.getMetaDado();
String title = metaDado.getName();
if (title.length() > 60) {
title = title.substring(0, 57) + "...";
}
TableView downloadTable = new TableView();
TableColumn<DownloadDataTable, Double> progress = new TableColumn<>("progress");
progress.setCellFactory(new Callback<TableColumn<DownloadDataTable, Double>, TableCell<DownloadDataTable, Double>>() {
@Override
public TableCell<DownloadDataTable, Double> call(TableColumn<DownloadDataTable, Double> p) {
final ProgressBar progressBar = new ProgressBar(-1);
final TableCell cell = new TableCell<DownloadDataTable, Double>() {
@Override
protected void updateItem(Double t, boolean bln) {
super.updateItem(t, bln);
if (bln) {
setText(null);
setGraphic(null);
} else {
progressBar.setProgress(t);
progressBar.prefWidthProperty().bind(this.widthProperty());
setGraphic(progressBar);
setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
}
}
};
cell.setAlignment(Pos.CENTER);
return cell;
}
});
progress.setCellValueFactory(new PropertyValueFactory<DownloadDataTable, Double>("progress"));
progress.setText("Progresso");
TableColumn<DownloadDataTable, String> type = new TableColumn<>("type");
type.setCellFactory(new Callback<TableColumn<DownloadDataTable, String>, TableCell<DownloadDataTable, String>>() {
@Override
public TableCell<DownloadDataTable, String> call(TableColumn<DownloadDataTable, String> p) {
TableCell cell = new TableCell<DownloadDataTable, String>() {
@Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
setText(empty ? null : getString());
setGraphic(null);
}
private String getString() {
return getItem() == null ? "" : getItem().toString();
}
};
cell.setAlignment(Pos.CENTER);
return cell;
}
});
type.setCellValueFactory(new PropertyValueFactory<DownloadDataTable, String>("type"));
type.setText("Tipo");
TableColumn<DownloadDataTable, String> status = new TableColumn<>("status");
status.setCellFactory(new Callback<TableColumn<DownloadDataTable, String>, TableCell<DownloadDataTable, String>>() {
@Override
public TableCell<DownloadDataTable, String> call(TableColumn<DownloadDataTable, String> p) {
TableCell cell = new TableCell<DownloadDataTable, String>() {
@Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
setText(empty ? null : getString());
setGraphic(null);
}
private String getString() {
return getItem() == null ? "" : getItem().toString();
}
};
cell.setAlignment(Pos.CENTER);
return cell;
}
});
status.setCellValueFactory(new PropertyValueFactory<DownloadDataTable, String>("status"));
status.setText("Status");
downloadTable.getColumns().addAll(progress, type, status);
List<PendingComponents> pendingComponents = downloadContent.getPendingComponents();
ObservableList<DownloadDataTable> data = FXCollections.observableArrayList();
for (PendingComponents pendingComponent : pendingComponents) {
String typeComponent;
if (pendingComponent.getType().equalsIgnoreCase(Constants.HTML)) {
typeComponent = "Conteúdo Principal";
} else {
typeComponent = "Pacote de Imagens";
}
data.add(new DownloadDataTable(-1, typeComponent, "Preparando download"));
}
downloadTable.setItems(data);
downloadTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
TitledPane downloadPane = new TitledPane(title, downloadTable);
downloadPane.setId(metaDado.getOfflineUuid());
vBoxDownload.getChildren().add(downloadPane);
}
直到这里一切似乎都运行正常,但是当我尝试恢复我的表并更新数据时,我的表格没有更新。我已经进行了debbuged,一切似乎都有效,即使数据值发生了变化,但我的表仍然没有更新。看我的代码:
private void publishProgress(final String msg) {
Platform.runLater(new Runnable() {
@Override
public void run() {
TitledPane titledPane = (TitledPane) controller.vBoxDownload.lookup("#"+metaDado.getOfflineUuid());
TableView table = (TableView) titledPane.getContent();
DownloadDataTable data = (DownloadDataTable) table.getItems().get(0);
data.setProgress(100);
data.setStatus(msg);
}
});
}
如果我尝试删除并添加我的行,它不起作用,但如果我只是添加另一行的新值,我得到一个具有相同值的旧行和一个带有新值的新行。我无法弄清楚我做错了什么,有人可以帮助我吗?
答案 0 :(得分:8)
当进度值发生变化时,您不需要添加/删除行以使表更新。
问题是您没有使TableView可以访问progress属性。这会导致 progress.setCellValueFactory(...)调用将getProgress()值包装到新的ObservableObjectWrapper中。这允许值显示在TableView中,但是当值发生更改时它不会通知表。
将以下内容添加到您的DownloadDataTable类中,当值更改时,您的表将更新:
public SimpleDoubleProperty progressProperty() {
return this.progress;
}
public SimpleStringProperty typeProperty() {
return this.type;
}
public SimpleStringProperty statusProperty() {
return this.status;
}