Java tutorial
package com.risevision.ui.client.common.widgets; /** * Copyright (c) 2007, AurorisNET. * * Everyone is permitted to copy and distribute verbatim copies of this license * document, but changing it is not allowed. * * Preamble * * This license establishes the terms under which a given free software Package * may be copied, modified, distributed, and/or redistributed. The intent is * that the Copyright Holder maintains some artistic control over the * development of that Package while still keeping the Package available as open * source and free software. * * You are always permitted to make arrangements wholly outside of this license * directly with the Copyright Holder of a given Package. If the terms of this * license do not permit the full use that you propose to make of the Package, * you should contact the Copyright Holder and seek a different licensing * arrangement. * * Definitions * * "Copyright Holder" means the individual(s) or organization(s) named in the * copyright notice for the entire Package. * * "Contributor" means any party that has contributed code or other material to * the Package, in accordance with the Copyright Holder's procedures. * * "You" and "your" means any person who would like to copy, distribute, or * modify the Package. * * "Package" means the collection of files distributed by the Copyright Holder, * and derivatives of that collection and/or of those files. A given Package may * consist of either the Standard Version, or a Modified Version. * * "Distribute" means providing a copy of the Package or making it accessible to * anyone else, or in the case of a company or organization, to others outside * of your company or organization. * * "Distributor Fee" means any fee that you charge for Distributing this Package * or providing support for this Package to another party. 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The resulting Package will still be * considered the Standard Version, and as such will be subject to the Original * License. * * Distribution of Modified Versions of the Package as Source * * (4) You may Distribute your Modified Version as Source (either gratis or for * a Distributor Fee, and with or without a Compiled form of the Modified * Version) provided that you clearly document how it differs from the Standard * Version, including, but not limited to, documenting any non-standard * features, executables, or modules, and provided that you do at least ONE of * the following: * * (a) make the Modified Version available to the Copyright Holder of the * Standard Version, under the Original License, so that the Copyright * Holder may include your modifications in the Standard Version. * * (b) ensure that installation of your Modified Version does not prevent * the user installing or running the Standard Version. In addition, * the Modified Version must bear a name that is different from the * name of the Standard Version. * * (c) allow anyone who receives a copy of the Modified Version to make the * Source form of the Modified Version available to others under * * (i) the Original License or * * (ii) a license that permits the licensee to freely copy, modify and * redistribute the Modified Version using the same licensing terms * that apply to the copy that the licensee received, and requires * that the Source form ofthe Modified Version, and of any works * derived from it, be made freely available in that license fees * are prohibited but Distributor Fees are allowed. * * Distribution of Compiled Forms of the Standard Version or Modified Versions * without the Source * * (5) You may Distribute Compiled forms of the Standard Version without the * Source, provided that you include complete instructions on how to get the * Source of the Standard Version. Such instructions must be valid at the time * of your distribution. If these instructions, at any time while you are * carrying out such distribution, become invalid, you must provide new * instructions on demand or cease further distribution. If you provide valid * instructions or cease distribution within thirty days after you become aware * that the instructions are invalid, then you do not forfeit any of your rights * under this license. * * (6) You may Distribute a Modified Version in Compiled form without the * Source, provided that you comply with Section 4 with respect to the Source of * the Modified Version. * * Aggregating or Linking the Package * * (7) You may aggregate the Package (either the Standard Version or Modified * Version) with other packages and Distribute the resulting aggregation * provided that you do not charge a licensing fee for the Package. Distributor * Fees are permitted, and licensing fees for other components in the * aggregation are permitted. The terms of this license apply to the use and * Distribution of the Standard or Modified Versions as included in the * aggregation. * * (8) You are permitted to link Modified and Standard Versions with other * works, to embed the Package in a larger work of your own, or to build * stand-alone binary or bytecode versions of applications that include the * Package, and Distribute the result without restriction, provided the result * does not expose a direct interface to the Package. * * Items That are Not Considered Part of a Modified Version * * (9) Works (including, but not limited to, modules and scripts) that merely * extend or make use of the Package, do not, by themselves, cause the Package * to be a Modified Version. In addition, such works are not considered parts of * the Package itself, and are not subject to the terms of this license. * * General Provisions * * (10) Any use, modification, and distribution of the Standard or Modified * Versions is governed by this Artistic License. By using, modifying or * distributing the Package, you accept this license. Do not use, modify, or * distribute the Package, if you do not accept this license. * * (11) If your Modified Version has been derived from a Modified Version made * by someone other than you, you are nevertheless required to ensure that your * Modified Version complies with the requirements of this license. * * (12) This license does not grant you the right to use any trademark, service * mark, tradename, or logo of the Copyright Holder. * * (13) This license includes the non-exclusive, worldwide, free-of-charge * patent license to make, have made, use, offer to sell, sell, import and * otherwise transfer the Package with respect to any patent claims licensable * by the Copyright Holder that are necessarily infringed by the Package. If you * institute patent litigation (including a cross-claim or counterclaim) against * any party alleging that the Package constitutes direct or contributory patent * infringement, then this Artistic License to you shall terminate on the date * that such litigation is filed. * * (14) Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER * AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR * NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. * UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY * OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. */ import com.google.gwt.dom.client.Element; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.user.client.Command; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.HTML; /** * Implements the SliderBar control. */ public final class SliderBarWidget extends HTML { private Element innerEl; private Element thumb; private Command onBarSelected = null; private boolean capturedMouse = false; private int length = 100; private boolean vertical = false; private int halfThumb; private int pos = 0; /*** * Initialize the SliderMap -- default mode is Saturation. */ public SliderBarWidget(int length, boolean vertical) { super(); this.vertical = vertical; getElement().getStyle().setProperty("position", "relative"); Element targetEl = DOM.createDiv(); // handle wrapped slider if (getElement() != targetEl) { DOM.sinkEvents(targetEl, Event.FOCUSEVENTS); } targetEl.addClassName("x-slider"); targetEl.addClassName(vertical ? "x-slider-vert" : "x-slider-horz"); Element endEl = DOM.createDiv(); endEl.addClassName("x-slider-end"); innerEl = DOM.createDiv(); innerEl.addClassName("x-slider-inner"); endEl.appendChild(innerEl); targetEl.setTabIndex(0); targetEl.setAttribute("hideFocus", "true"); targetEl.appendChild(endEl); thumb = DOM.createDiv(); thumb.addClassName("x-slider-thumb"); innerEl.appendChild(thumb); DOM.appendChild(getElement(), targetEl); if (vertical) { targetEl.getStyle().setHeight(length + 7, Unit.PX); innerEl.getStyle().setHeight(length, Unit.PX); } else { targetEl.getStyle().setWidth(length + 7, Unit.PX); innerEl.getStyle().setWidth(length, Unit.PX); } } public void init(Command onBarSelected) { this.onBarSelected = onBarSelected; } /*** * This method is called when a widget is attached to the browser's document. */ @Override public void onAttach() { super.onAttach(); halfThumb = (vertical ? thumb.getClientHeight() : thumb.getClientWidth()) / 2; thumb.getStyle().setProperty(vertical ? "top" : "left", 0 - halfThumb + "px"); } /** * Fired whenever a browser event is received. * @param event Event to process */ @Override public void onBrowserEvent(Event event) { switch (DOM.eventGetType(event)) { case Event.ONMOUSEUP: Event.releaseCapture(this.getElement()); capturedMouse = false; break; case Event.ONMOUSEDOWN: Event.setCapture(this.getElement()); capturedMouse = true; case Event.ONMOUSEMOVE: if (capturedMouse) { event.preventDefault(); if (vertical) { int y = event.getClientY() - getAbsoluteTop() + Window.getScrollTop() - 7; if (y < 0) y = 0; if (y > length) y = length; thumb.getStyle().setProperty("top", y - halfThumb + "px"); pos = y; } else { int x = event.getClientX() - getAbsoluteLeft() + Window.getScrollLeft() - 7; if (x < 0) x = 0; if (x > length) x = length; thumb.getStyle().setProperty("left", x - halfThumb + "px"); pos = x; } if (onBarSelected != null) { onBarSelected.execute(); } } } } /* * (non-Javadoc) * @see com.google.gwt.user.client.ui.Widget#onLoad() */ @Override public void onLoad() { super.onLoad(); this.sinkEvents(Event.MOUSEEVENTS); } /* * (non-Javadoc) * @see com.google.gwt.user.client.ui.Widget#onUnload() */ @Override public void onUnload() { super.onUnload(); this.unsinkEvents(Event.MOUSEEVENTS); } /** * Sets the slider's position on the y or y-axis. * @param pos Position along the x or y-axis to set the slider's position to. */ public void setSliderPosition(int pos) { if (pos < 0) pos = 0; if (pos > length) pos = length; thumb.getStyle().setProperty(vertical ? "top" : "left", pos - halfThumb + "px"); this.pos = pos; } /** * Gets the slider's position on the y or y-axis. */ public int getSliderPosition() { return pos; } }