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Diffstat (limited to 'src/com/vaadin/ui/Label.java')
-rw-r--r-- | src/com/vaadin/ui/Label.java | 546 |
1 files changed, 546 insertions, 0 deletions
diff --git a/src/com/vaadin/ui/Label.java b/src/com/vaadin/ui/Label.java new file mode 100644 index 0000000000..3b24a07930 --- /dev/null +++ b/src/com/vaadin/ui/Label.java @@ -0,0 +1,546 @@ +/* +@ITMillApache2LicenseForJavaFiles@ + */ + +package com.vaadin.ui; + +import java.lang.reflect.Method; + +import com.vaadin.data.Property; +import com.vaadin.data.util.ObjectProperty; +import com.vaadin.terminal.PaintException; +import com.vaadin.terminal.PaintTarget; + +/** + * Label component for showing non-editable short texts. + * + * The label content can be set to the modes specified by the final members + * CONTENT_* + * + * <p> + * The contents of the label may contain simple formatting: + * <ul> + * <li><b><b></b> Bold + * <li><b><i></b> Italic + * <li><b><u></b> Underlined + * <li><b><br/></b> Linebreak + * <li><b><ul><li>item 1</li><li>item 2</li></ul></b> List of + * items + * </ul> + * The <b>b</b>,<b>i</b>,<b>u</b> and <b>li</b> tags can contain all the tags in + * the list recursively. + * </p> + * + * @author IT Mill Ltd. + * @version + * @VERSION@ + * @since 3.0 + */ +@SuppressWarnings("serial") +public class Label extends AbstractComponent implements Property, + Property.Viewer, Property.ValueChangeListener, + Property.ValueChangeNotifier, Comparable { + + /** + * Content mode, where the label contains only plain text. The getValue() + * result is coded to XML when painting. + */ + public static final int CONTENT_TEXT = 0; + + /** + * Content mode, where the label contains preformatted text. + */ + public static final int CONTENT_PREFORMATTED = 1; + + /** + * Formatted content mode, where the contents is XML restricted to the UIDL + * 1.0 formatting markups. + * + * @deprecated Use CONTENT_XML instead. + */ + @Deprecated + public static final int CONTENT_UIDL = 2; + + /** + * Content mode, where the label contains XHTML. Contents is then enclosed + * in DIV elements having namespace of + * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd". + */ + public static final int CONTENT_XHTML = 3; + + /** + * Content mode, where the label contains well-formed or well-balanced XML. + * Each of the root elements must have their default namespace specified. + */ + public static final int CONTENT_XML = 4; + + /** + * Content mode, where the label contains RAW output. Output is not required + * to comply to with XML. In Web Adapter output is inserted inside the + * resulting HTML document as-is. This is useful for some specific purposes + * where possibly broken HTML content needs to be shown, but in most cases + * XHTML mode should be preferred. + */ + public static final int CONTENT_RAW = 5; + + /** + * The default content mode is plain text. + */ + public static final int CONTENT_DEFAULT = CONTENT_TEXT; + + /** Array of content mode names that are rendered in UIDL as mode attribute. */ + private static final String[] CONTENT_MODE_NAME = { "text", "pre", "uidl", + "xhtml", "xml", "raw" }; + + private static final String DATASOURCE_MUST_BE_SET = "Datasource must be set"; + + private Property dataSource; + + private int contentMode = CONTENT_DEFAULT; + + /** + * Creates an empty Label. + */ + public Label() { + this(""); + } + + /** + * Creates a new instance of Label with text-contents. + * + * @param content + */ + public Label(String content) { + this(content, CONTENT_DEFAULT); + } + + /** + * Creates a new instance of Label with text-contents read from given + * datasource. + * + * @param contentSource + */ + public Label(Property contentSource) { + this(contentSource, CONTENT_DEFAULT); + } + + /** + * Creates a new instance of Label with text-contents. + * + * @param content + * @param contentMode + */ + public Label(String content, int contentMode) { + this(new ObjectProperty(content, String.class), contentMode); + } + + /** + * Creates a new instance of Label with text-contents read from given + * datasource. + * + * @param contentSource + * @param contentMode + */ + public Label(Property contentSource, int contentMode) { + setPropertyDataSource(contentSource); + if (contentMode != CONTENT_DEFAULT) { + setContentMode(contentMode); + } + setWidth(100, UNITS_PERCENTAGE); + } + + /** + * Get the component UIDL tag. + * + * @return the Component UIDL tag as string. + */ + @Override + public String getTag() { + return "label"; + } + + /** + * Set the component to read-only. Readonly is not used in label. + * + * @param readOnly + * True to enable read-only mode, False to disable it. + */ + @Override + public void setReadOnly(boolean readOnly) { + if (dataSource == null) { + throw new IllegalStateException(DATASOURCE_MUST_BE_SET); + } + dataSource.setReadOnly(readOnly); + } + + /** + * Is the component read-only ? Readonly is not used in label - this returns + * allways false. + * + * @return <code>true</code> if the component is in read only mode. + */ + @Override + public boolean isReadOnly() { + if (dataSource == null) { + throw new IllegalStateException(DATASOURCE_MUST_BE_SET); + } + return dataSource.isReadOnly(); + } + + /** + * Paints the content of this component. + * + * @param target + * the Paint Event. + * @throws PaintException + * if the Paint Operation fails. + */ + @Override + public void paintContent(PaintTarget target) throws PaintException { + if (contentMode != CONTENT_TEXT) { + target.addAttribute("mode", CONTENT_MODE_NAME[contentMode]); + } + if (contentMode == CONTENT_TEXT) { + target.addText(toString()); + } else if (contentMode == CONTENT_UIDL) { + target.addUIDL(toString()); + } else if (contentMode == CONTENT_XHTML) { + target.startTag("data"); + target.addXMLSection("div", toString(), + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"); + target.endTag("data"); + } else if (contentMode == CONTENT_PREFORMATTED) { + target.startTag("pre"); + target.addText(toString()); + target.endTag("pre"); + } else if (contentMode == CONTENT_XML) { + target.addXMLSection("data", toString(), null); + } else if (contentMode == CONTENT_RAW) { + target.startTag("data"); + target.addAttribute("escape", false); + target.addText(toString()); + target.endTag("data"); + } + + } + + /** + * Gets the value of the label. Value of the label is the XML contents of + * the label. + * + * @return the Value of the label. + */ + public Object getValue() { + if (dataSource == null) { + throw new IllegalStateException(DATASOURCE_MUST_BE_SET); + } + return dataSource.getValue(); + } + + /** + * Set the value of the label. Value of the label is the XML contents of the + * label. + * + * @param newValue + * the New value of the label. + */ + public void setValue(Object newValue) { + if (dataSource == null) { + throw new IllegalStateException(DATASOURCE_MUST_BE_SET); + } + dataSource.setValue(newValue); + } + + /** + * @see java.lang.Object#toString() + */ + @Override + public String toString() { + if (dataSource == null) { + throw new IllegalStateException(DATASOURCE_MUST_BE_SET); + } + return dataSource.toString(); + } + + /** + * Gets the type of the Property. + * + * @see com.vaadin.data.Property#getType() + */ + public Class getType() { + if (dataSource == null) { + throw new IllegalStateException(DATASOURCE_MUST_BE_SET); + } + return dataSource.getType(); + } + + /** + * Gets the viewing data-source property. + * + * @return the data source property. + * @see com.vaadin.data.Property.Viewer#getPropertyDataSource() + */ + public Property getPropertyDataSource() { + return dataSource; + } + + /** + * Sets the property as data-source for viewing. + * + * @param newDataSource + * the new data source Property + * @see com.vaadin.data.Property.Viewer#setPropertyDataSource(com.vaadin.data.Property) + */ + public void setPropertyDataSource(Property newDataSource) { + // Stops listening the old data source changes + if (dataSource != null + && Property.ValueChangeNotifier.class + .isAssignableFrom(dataSource.getClass())) { + ((Property.ValueChangeNotifier) dataSource).removeListener(this); + } + + // Sets the new data source + dataSource = newDataSource; + + // Listens the new data source if possible + if (dataSource != null + && Property.ValueChangeNotifier.class + .isAssignableFrom(dataSource.getClass())) { + ((Property.ValueChangeNotifier) dataSource).addListener(this); + } + } + + /** + * Gets the content mode of the Label. + * + * <p> + * Possible content modes include: + * <ul> + * <li><b>CONTENT_TEXT</b> Content mode, where the label contains only plain + * text. The getValue() result is coded to XML when painting.</li> + * <li><b>CONTENT_PREFORMATTED</b> Content mode, where the label contains + * preformatted text.</li> + * <li><b>CONTENT_UIDL</b> Formatted content mode, where the contents is XML + * restricted to the UIDL 1.0 formatting markups.</li> + * <li><b>CONTENT_XHTML</b> Content mode, where the label contains XHTML. + * Contents is then enclosed in DIV elements having namespace of + * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd".</li> + * <li><b>CONTENT_XML</b> Content mode, where the label contains well-formed + * or well-balanced XML. Each of the root elements must have their default + * namespace specified.</li> + * <li><b>CONTENT_RAW</b> Content mode, where the label contains RAW output. + * Output is not required to comply to with XML. In Web Adapter output is + * inserted inside the resulting HTML document as-is. This is useful for + * some specific purposes where possibly broken HTML content needs to be + * shown, but in most cases XHTML mode should be preferred.</li> + * </ul> + * </p> + * + * @return the Content mode of the label. + */ + public int getContentMode() { + return contentMode; + } + + /** + * Sets the content mode of the Label. + * + * <p> + * Possible content modes include: + * <ul> + * <li><b>CONTENT_TEXT</b> Content mode, where the label contains only plain + * text. The getValue() result is coded to XML when painting.</li> + * <li><b>CONTENT_PREFORMATTED</b> Content mode, where the label contains + * preformatted text.</li> + * <li><b>CONTENT_UIDL</b> Formatted content mode, where the contents is XML + * restricted to the UIDL 1.0 formatting markups.</li> + * <li><b>CONTENT_XHTML</b> Content mode, where the label contains XHTML. + * Contents is then enclosed in DIV elements having namespace of + * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd".</li> + * <li><b>CONTENT_XML</b> Content mode, where the label contains well-formed + * or well-balanced XML. Each of the root elements must have their default + * namespace specified.</li> + * <li><b>CONTENT_RAW</b> Content mode, where the label contains RAW output. + * Output is not required to comply to with XML. In Web Adapter output is + * inserted inside the resulting HTML document as-is. This is useful for + * some specific purposes where possibly broken HTML content needs to be + * shown, but in most cases XHTML mode should be preferred.</li> + * </ul> + * </p> + * + * @param contentMode + * the New content mode of the label. + */ + public void setContentMode(int contentMode) { + if (contentMode != this.contentMode && contentMode >= CONTENT_TEXT + && contentMode <= CONTENT_RAW) { + this.contentMode = contentMode; + requestRepaint(); + } + } + + /* Value change events */ + + private static final Method VALUE_CHANGE_METHOD; + + static { + try { + VALUE_CHANGE_METHOD = Property.ValueChangeListener.class + .getDeclaredMethod("valueChange", + new Class[] { Property.ValueChangeEvent.class }); + } catch (final java.lang.NoSuchMethodException e) { + // This should never happen + throw new java.lang.RuntimeException( + "Internal error finding methods in Label"); + } + } + + /** + * Value change event + * + * @author IT Mill Ltd. + * @version + * @VERSION@ + * @since 3.0 + */ + public class ValueChangeEvent extends Component.Event implements + Property.ValueChangeEvent { + + /** + * New instance of text change event + * + * @param source + * the Source of the event. + */ + public ValueChangeEvent(Label source) { + super(source); + } + + /** + * Gets the Property that has been modified. + * + * @see com.vaadin.data.Property.ValueChangeEvent#getProperty() + */ + public Property getProperty() { + return (Property) getSource(); + } + } + + /** + * Adds the value change listener. + * + * @param listener + * the Listener to be added. + * @see com.vaadin.data.Property.ValueChangeNotifier#addListener(com.vaadin.data.Property.ValueChangeListener) + */ + public void addListener(Property.ValueChangeListener listener) { + addListener(Label.ValueChangeEvent.class, listener, VALUE_CHANGE_METHOD); + } + + /** + * Removes the value change listener. + * + * @param listener + * the Listener to be removed. + * @see com.vaadin.data.Property.ValueChangeNotifier#removeListener(com.vaadin.data.Property.ValueChangeListener) + */ + public void removeListener(Property.ValueChangeListener listener) { + removeListener(Label.ValueChangeEvent.class, listener, + VALUE_CHANGE_METHOD); + } + + /** + * Emits the options change event. + */ + protected void fireValueChange() { + // Set the error message + fireEvent(new Label.ValueChangeEvent(this)); + requestRepaint(); + } + + /** + * Listens the value change events from data source. + * + * @see com.vaadin.data.Property.ValueChangeListener#valueChange(Property.ValueChangeEvent) + */ + public void valueChange(Property.ValueChangeEvent event) { + fireValueChange(); + } + + /** + * Compares the Label to other objects. + * + * <p> + * Labels can be compared to other labels for sorting label contents. This + * is especially handy for sorting table columns. + * </p> + * + * <p> + * In RAW, PREFORMATTED and TEXT modes, the label contents are compared as + * is. In XML, UIDL and XHTML modes, only CDATA is compared and tags + * ignored. If the other object is not a Label, its toString() return value + * is used in comparison. + * </p> + * + * @param other + * the Other object to compare to. + * @return a negative integer, zero, or a positive integer as this object is + * less than, equal to, or greater than the specified object. + * @see java.lang.Comparable#compareTo(java.lang.Object) + */ + public int compareTo(Object other) { + + String thisValue; + String otherValue; + + if (contentMode == CONTENT_XML || contentMode == CONTENT_UIDL + || contentMode == CONTENT_XHTML) { + thisValue = stripTags(toString()); + } else { + thisValue = toString(); + } + + if (other instanceof Label + && (((Label) other).getContentMode() == CONTENT_XML + || ((Label) other).getContentMode() == CONTENT_UIDL || ((Label) other) + .getContentMode() == CONTENT_XHTML)) { + otherValue = stripTags(other.toString()); + } else { + otherValue = other.toString(); + } + + return thisValue.compareTo(otherValue); + } + + /** + * Strips the tags from the XML. + * + * @param xml + * the String containing a XML snippet. + * @return the original XML without tags. + */ + private String stripTags(String xml) { + + final StringBuffer res = new StringBuffer(); + + int processed = 0; + final int xmlLen = xml.length(); + while (processed < xmlLen) { + int next = xml.indexOf('<', processed); + if (next < 0) { + next = xmlLen; + } + res.append(xml.substring(processed, next)); + if (processed < xmlLen) { + next = xml.indexOf('>', processed); + if (next < 0) { + next = xmlLen; + } + processed = next + 1; + } + } + + return res.toString(); + } + +} |