com.databasepreservation.visualization.shared.client.widgets.Toast.java Source code

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Here is the source code for com.databasepreservation.visualization.shared.client.widgets.Toast.java

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/**
 * The contents of this file are based on those found at https://github.com/keeps/roda
 * and are subject to the license and copyright detailed in https://github.com/keeps/roda
 */
package com.databasepreservation.visualization.shared.client.widgets;

import com.databasepreservation.visualization.shared.client.widgets.wcag.AccessibleFocusPanel;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.PopupPanel;

import config.i18n.client.ClientMessages;

/**
 * @author Luis Faria
 * 
 */
public class Toast extends PopupPanel {
    private static final int PADDING = 10;

    private static final int SLOTS_NUMBER = 7;

    private static final Toast[] slots = new Toast[SLOTS_NUMBER];

    private static int currentSlot = 0;

    private static int getNextSlot(Toast next) {
        if (slots[currentSlot] != null) {
            currentSlot = (currentSlot + 1) % SLOTS_NUMBER;
            if (slots[currentSlot] != null) {
                slots[currentSlot].hide();
            }
        }
        slots[currentSlot] = next;
        return currentSlot;
    }

    private static final int HIDE_DELAY_MS = 7000;

    /**
     * The type of message
     */
    public static enum MessagePopupType {
        /**
         * An error message
         */
        ERROR_MESSAGE, INFO
    }

    private static final ClientMessages messages = (ClientMessages) GWT.create(ClientMessages.class);

    private final int slotNumber;

    private final MessagePopupType type;

    private final AccessibleFocusPanel focus;

    private final FlowPanel layout;

    private final Label titleLabel;

    private final Label messageLabel;

    private final Timer hideTimer;

    /**
     * Create a new message popup
     * 
     * @param type
     * @param title
     * @param message
     */
    public Toast(MessagePopupType type, String title, String message) {
        super(false);
        this.type = type;
        slotNumber = getNextSlot(this);
        layout = new FlowPanel();
        focus = new AccessibleFocusPanel(layout);
        titleLabel = new Label(title);
        messageLabel = new Label(message);

        if (type.equals(MessagePopupType.ERROR_MESSAGE)) {
            layout.addStyleName("toast-error");
        } else if (type.equals(MessagePopupType.INFO)) {
            layout.addStyleName("toast-info");
        }

        layout.add(titleLabel);
        layout.add(messageLabel);

        setWidget(focus);

        focus.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                hide();
            }
        });

        hideTimer = new Timer() {
            public void run() {
                hide();
            }
        };

        layout.addStyleName("wui-toast");
        titleLabel.addStyleName("toast-title");
        messageLabel.addStyleName("toast-message");
    }

    public void hide() {
        super.hide();
        slots[slotNumber] = null;
    }

    /**
     * Start showing popup
     */
    public void start() {
        setPopupPositionAndShow(new PositionCallback() {

            public void setPosition(int offsetWidth, int offsetHeight) {
                int slotOffset = 0;
                for (int i = 0; i < slotNumber; i++) {
                    if (slots[i] != null) {
                        slotOffset += slots[i].getOffsetHeight() + PADDING;
                    }
                }
                Toast.this.setPopupPosition(Window.getClientWidth() - offsetWidth - PADDING,
                        Window.getScrollTop() + PADDING + slotOffset);
            }

        });

        hideTimer.schedule(HIDE_DELAY_MS);

    }

    /**
     * Show a error message
     * 
     * @param message
     */
    public static void showError(String message) {
        Toast errorPopup = new Toast(MessagePopupType.ERROR_MESSAGE, messages.alertErrorTitle(), message);
        errorPopup.start();
    }

    /**
     * Show an error message
     * 
     * @param title
     * @param message
     */
    public static void showError(String title, String message) {
        Toast errorPopup = new Toast(MessagePopupType.ERROR_MESSAGE, title, message);
        errorPopup.start();
    }

    /**
     * Show a error message
     * 
     * @param message
     */
    public static void showInfo(String title, String message) {
        Toast errorPopup = new Toast(MessagePopupType.INFO, title, message);
        errorPopup.start();
    }

    /**
     * Get the message popup type
     * 
     * @return
     */
    public MessagePopupType getType() {
        return type;
    }

    public static void showError(Throwable caught) {
        showError(caught.getClass().getName(), caught.getMessage());

    }
}