Example usage for com.google.gwt.event.logical.shared ValueChangeEvent ValueChangeEvent

Introduction

In this page you can find the example usage for com.google.gwt.event.logical.shared ValueChangeEvent ValueChangeEvent.

Prototype

protected ValueChangeEvent(T value) 

Source Link

Document

Creates a value change event.

Usage

From source file:org.onesocialweb.gwt.client.ui.widget.ListSelector.java

License:Apache License

public void addCheckbox(String list, Boolean value) {

    final CheckBox checkbox = new CheckBox(list);
    StyledFlowPanel fix = new StyledFlowPanel("fix");
    checkbox.addStyleName("checkbox");

    // manage checks and unchecks
    checkbox.addValueChangeHandler(new ValueChangeHandler<Boolean>() {

        @Override//  ww  w .  j a  v a  2s  .  com
        public void onValueChange(ValueChangeEvent<Boolean> event) {

            // is the item is checked?
            if (event.getValue() == true && !listed.contains(checkbox.getText()) && checkbox.getText() != null
                    && checkbox.getText().length() != 0) {
                // set the values
                listed.add(checkbox.getText());
                rosterItem.setGroups(listed);
                // disable during processing
                checkbox.setEnabled(false);

                // show task
                final DefaultTaskInfo task = new DefaultTaskInfo("Adding person to the list", false);
                TaskMonitor.getInstance().addTask(task);

                // save new state
                rosterItem.save(new RequestCallback<RosterItem>() {

                    @Override
                    public void onFailure() {
                        // return to original state and notify user
                        checkbox.setEnabled(true);
                        checkbox.setValue(true);
                        task.complete("Could not add person to list.", Status.failure);
                    }

                    @Override
                    public void onSuccess(RosterItem result) {
                        // enable the checkbox again
                        checkbox.setEnabled(true);
                        task.complete("", Status.succes);
                    }

                });
            } else if (event.getValue() == false && listed.contains(checkbox.getText())) {
                // set the values
                listed.remove(checkbox.getText());
                rosterItem.setGroups(listed);
                // disable during processing
                checkbox.setEnabled(false);

                // show task
                final DefaultTaskInfo task = new DefaultTaskInfo("Removing person from the list", false);
                TaskMonitor.getInstance().addTask(task);

                // save new state
                rosterItem.save(new RequestCallback<RosterItem>() {

                    @Override
                    public void onFailure() {
                        // return to original state and notify user
                        checkbox.setEnabled(true);
                        checkbox.setValue(true);
                        task.complete("Could not remove person from the list.", Status.failure);
                    }

                    @Override
                    public void onSuccess(RosterItem result) {
                        // enable the checkbox again
                        checkbox.setEnabled(true);
                        task.complete("", Status.succes);
                    }

                });
            }
        }

    });

    // if this person is already on the list make sure the checkbox is
    // checked
    if (listed != null && list.length() > 0 && listed.contains(list)) {
        checkbox.setValue(true);
    } else if (value == true) {
        // if a new checkbox is added automatically check it and fire a
        // change event
        checkbox.setValue(true);
        checkbox.fireEvent(new ValueChangeEvent<Boolean>(true) {
        });
    }
    if (checkbox.getText() != null && checkbox.getText().length() != 0) {
        wrapper.add(checkbox);
        wrapper.add(fix);
    }

}

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