Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
ButtonLinkRenderer |
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1 | // Copyright 2004, 2005 The Apache Software Foundation |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | ||
15 | package org.apache.tapestry.contrib.link; |
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16 | ||
17 | import org.apache.hivemind.ApplicationRuntimeException; |
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18 | import org.apache.tapestry.IMarkupWriter; |
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19 | import org.apache.tapestry.IRequestCycle; |
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20 | import org.apache.tapestry.Tapestry; |
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21 | import org.apache.tapestry.components.ILinkComponent; |
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22 | import org.apache.tapestry.engine.ILink; |
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23 | import org.apache.tapestry.link.ILinkRenderer; |
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24 | ||
25 | /** |
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26 | * An {@link ILinkRenderer} implementation that generates an HTML button. |
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27 | * This is particularly useful for implementing cancel buttons. |
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28 | * |
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29 | * @author Paul Ferraro |
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30 | * @since 4.0 |
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31 | */ |
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32 | 0 | public class ButtonLinkRenderer implements ILinkRenderer |
33 | { |
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34 | 0 | public static final ILinkRenderer SHARED_INSTANCE = new ButtonLinkRenderer(); |
35 | ||
36 | /** |
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37 | * @see org.apache.tapestry.link.ILinkRenderer#renderLink(org.apache.tapestry.IMarkupWriter, |
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38 | * org.apache.tapestry.IRequestCycle, org.apache.tapestry.components.ILinkComponent) |
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39 | */ |
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40 | public void renderLink(IMarkupWriter writer, IRequestCycle cycle, ILinkComponent component) |
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41 | { |
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42 | 0 | if (cycle.getAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME) != null) |
43 | { |
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44 | 0 | String message = Tapestry.getMessage("AbstractLinkComponent.no-nesting"); |
45 | 0 | throw new ApplicationRuntimeException(message, component, null, null); |
46 | } |
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47 | ||
48 | 0 | cycle.setAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME, component); |
49 | ||
50 | 0 | ILink link = component.getLink(cycle); |
51 | ||
52 | 0 | writer.begin("button"); |
53 | 0 | writer.attribute("type", "button"); |
54 | ||
55 | 0 | if (component.isDisabled()) |
56 | { |
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57 | 0 | writer.attribute("disabled", "disabled"); |
58 | } |
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59 | ||
60 | 0 | if (!cycle.isRewinding()) { |
61 | 0 | String url = link.getURL(component.getAnchor(), true); |
62 | 0 | String target = component.getTarget(); |
63 | 0 | String onclick = (target == null) ? getScript(url) : getScript(url, target); |
64 | ||
65 | 0 | writer.attribute("onclick", onclick); |
66 | } |
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67 | ||
68 | 0 | component.renderAdditionalAttributes(writer, cycle); |
69 | ||
70 | 0 | IMarkupWriter wrappedWriter = writer.getNestedWriter(); |
71 | ||
72 | 0 | component.renderBody(wrappedWriter, cycle); |
73 | ||
74 | 0 | wrappedWriter.close(); |
75 | ||
76 | 0 | writer.end(); |
77 | ||
78 | 0 | cycle.removeAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME); |
79 | 0 | } |
80 | ||
81 | /** |
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82 | * Generates the onclick event handler that opens the specified url in the current window. |
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83 | * @param url the url generated by this link |
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84 | * @return a JavaScript onclick event handler |
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85 | */ |
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86 | protected String getScript(String url) |
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87 | { |
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88 | 0 | return "window.location='" + url + "'"; |
89 | } |
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90 | ||
91 | /** |
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92 | * Generates the onclick event handler that opens the specified url in the specified window or frame. |
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93 | * @param url the url generated by this link |
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94 | * @param target the name of the target window or frame |
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95 | * @return a JavaScript onclick event handler |
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96 | */ |
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97 | protected String getScript(String url, String target) |
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98 | { |
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99 | 0 | return "window.open('" + url + "','" + target + "')"; |
100 | } |
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101 | } |