Reviewers: jlabanca, rice,

Description:
Added a RowStyles interface that can be used to customize the classes
assigned to <tr> elements in a CellTable.


Please review this at http://gwt-code-reviews.appspot.com/930801/show

Affected files:
  M user/src/com/google/gwt/user/cellview/client/CellTable.java
  A user/src/com/google/gwt/user/cellview/client/RowStyles.java


Index: user/src/com/google/gwt/user/cellview/client/CellTable.java
===================================================================
--- user/src/com/google/gwt/user/cellview/client/CellTable.java (revision 8835) +++ user/src/com/google/gwt/user/cellview/client/CellTable.java (working copy)
@@ -44,6 +44,7 @@
 import com.google.gwt.view.client.SelectionModel;

 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -411,6 +412,7 @@
    * Indicates whether or not a redraw is scheduled.
    */
   private boolean redrawScheduled;
+  private RowStyles<T> rowStyles;
   private final Style style;
   private final TableElement table;
   private final TableSectionElement tbody;
@@ -767,6 +769,14 @@
       return;
     }
     ensureTableColElement(index).removeClassName(styleName);
+  }
+
+  /**
+ * Sets the object used to determine how a row is styled; the change will take
+   * effect the next time that the table is rendered.
+   */
+  public void setRowStyles(RowStyles<T> rowStyles) {
+    this.rowStyles = rowStyles;
   }

   @Override
@@ -791,6 +801,16 @@
       String trClasses = i % 2 == 0 ? evenRowStyle : oddRowStyle;
       if (isSelected) {
         trClasses += selectedRowStyle;
+      }
+
+      if (rowStyles != null) {
+        Collection<String> extraRowStyles = rowStyles.getStyleNames(value);
+        if (extraRowStyles != null) {
+          for (String extraRowStyle : extraRowStyles) {
+            trClasses += " ";
+            trClasses += extraRowStyle;
+          }
+        }
       }

       SafeHtmlBuilder trBuilder = new SafeHtmlBuilder();
Index: user/src/com/google/gwt/user/cellview/client/RowStyles.java
===================================================================
--- user/src/com/google/gwt/user/cellview/client/RowStyles.java (revision 0)
+++ user/src/com/google/gwt/user/cellview/client/RowStyles.java (revision 0)
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2010 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.cellview.client;
+
+import java.util.Collection;
+
+/**
+ * A description of how rows are to be styled in a {...@link CellTable}.
+ *
+ * @param <T> the data type of each row
+ */
+public interface RowStyles<T> {
+
+  /**
+   * Get extra style names that should be applied to the given row.
+   *
+ * @return the extra styles of the given row, or {...@code null} if there are no
+   * extra styles for this row.
+   */
+  public Collection<String> getStyleNames(T row);
+}


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