com.google.gwt.user.client.ui.NonModalDraggablePopupPanel.java Source code

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Here is the source code for com.google.gwt.user.client.ui.NonModalDraggablePopupPanel.java

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/*
 * Copyright 2006 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.user.client.ui;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;

/**
 * A panel that can "pop up" over other widgets. It overlays the browser's
 * client area (and any previously-created popups).
 * 
 * <p>
 * <img class='gallery' src='DmPopupPanel.png'/>
 * </p>
 * 
 * <p>
 * <h3>Example</h3>
 * {@example com.google.gwt.examples.DmPopupPanelExample}
 * </p>
 */
public class NonModalDraggablePopupPanel extends NonModalPopupPanel implements MouseListener {

    protected HTML caption = new HTML();
    protected int panelHeight = 0;
    protected int panelWidth = 0;
    protected boolean dragging;
    protected int dragStartX, dragStartY;

    /**
     * Creates an empty popup panel. A child widget must be added to it before it
     * is shown.
     */
    public NonModalDraggablePopupPanel() {
        caption.addMouseListener(this);
    }

    /**
     * Creates an empty popup panel, specifying its "auto-hide" property.
     * 
     * @param autoHide <code>true</code> if the popup should be automatically
     *          hidden when the user clicks outside of it
     */
    public NonModalDraggablePopupPanel(boolean autoHide) {
        super(autoHide);

        caption.addMouseListener(this);
    }

    public int getPanelHeight() {
        return this.panelHeight;
    }

    public void setPanelHeight(int panelHeight) {
        this.panelHeight = panelHeight;
    }

    public void onMouseDown(Widget sender, int x, int y) {

        dragging = true;
        DOM.setCapture(caption.getElement());
        dragStartX = x;
        dragStartY = y;
    }

    public void onMouseEnter(Widget sender) {
    }

    public void onMouseLeave(Widget sender) {
    }

    public void onMouseMove(Widget sender, int x, int y) {
        if (dragging) {
            int absX = x + getAbsoluteLeft();
            int absY = y + getAbsoluteTop();

            int posX = absX - dragStartX;
            int posY = absY - dragStartY;

            if (posX + this.panelWidth > Window.getClientWidth()) {
                posX = Window.getClientWidth() - this.panelWidth;
            }
            if (posY + this.panelHeight > Window.getClientHeight()) {
                posY = Window.getClientHeight() - this.panelHeight;
            }
            setPopupPosition(posX, posY);
        }
    }

    public void onMouseUp(Widget sender, int x, int y) {
        dragging = false;
        DOM.releaseCapture(caption.getElement());
    }

}