| // Copyright 2004, 2005 The Apache Software Foundation |
| // |
| // 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 org.apache.tapestry.contrib.table.components; |
| |
| import java.util.Iterator; |
| |
| import org.apache.tapestry.IAsset; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRender; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.contrib.table.model.ITableColumn; |
| import org.apache.tapestry.contrib.table.model.ITableColumnModel; |
| |
| /** |
| * A low level Table component that renders the column headers in the table. |
| * This component must be wrapped by |
| * {@link org.apache.tapestry.contrib.table.components.TableView}. |
| * <p> |
| * The component iterates over all column objects in the |
| * {@link org.apache.tapestry.contrib.table.model.ITableColumnModel}and renders |
| * a header for each one of them using the renderer provided by the |
| * getColumnRender() method in |
| * {@link org.apache.tapestry.contrib.table.model.ITableColumn}. The headers |
| * are wrapped in 'th' tags by default. |
| * <p> |
| * Please see the Component Reference for details on how to use this component. [ |
| * <a |
| * href="../../../../../../../ComponentReference/contrib.TableColumns.html">Component |
| * Reference </a>] |
| * |
| * @author mindbridge |
| */ |
| public abstract class TableColumns extends AbstractTableViewComponent |
| { |
| |
| public static final String TABLE_COLUMN_ARROW_UP_ATTRIBUTE = "org.apache.tapestry.contrib.table.components.TableColumns.arrowUp"; |
| |
| public static final String TABLE_COLUMN_ARROW_DOWN_ATTRIBUTE = "org.apache.tapestry.contrib.table.components.TableColumns.arrowDown"; |
| |
| public static final String TABLE_COLUMN_CSS_CLASS_SUFFIX = "ColumnHeader"; |
| |
| // Transient |
| private ITableColumn m_objTableColumn = null; |
| |
| public abstract IAsset getArrowDownAsset(); |
| |
| public abstract IAsset getArrowUpAsset(); |
| |
| public abstract void setColumn(ITableColumn column); |
| |
| /** |
| * Returns the currently rendered table column. You can call this method to |
| * obtain the current column. |
| * |
| * @return ITableColumn the current table column |
| */ |
| public ITableColumn getTableColumn() |
| { |
| return m_objTableColumn; |
| } |
| |
| /** |
| * Sets the currently rendered table column. This method is for internal use |
| * only. |
| * |
| * @param tableColumn |
| * The current table column |
| */ |
| public void setTableColumn(ITableColumn tableColumn) |
| { |
| m_objTableColumn = tableColumn; |
| |
| if (isParameterBound("column")) setColumn(tableColumn); |
| } |
| |
| /** |
| * Get the list of all table columns to be displayed. |
| * |
| * @return an iterator of all table columns |
| */ |
| public Iterator getTableColumnIterator() |
| { |
| ITableColumnModel objColumnModel = getTableModelSource() |
| .getTableModel().getColumnModel(); |
| return objColumnModel.getColumns(); |
| } |
| |
| /** |
| * Returns the renderer to be used to generate the header of the current |
| * column. |
| * |
| * @return the header renderer of the current column |
| */ |
| public IRender getTableColumnRenderer() |
| { |
| return getTableColumn().getColumnRenderer(getPage().getRequestCycle(), |
| getTableModelSource()); |
| } |
| |
| public abstract String getColumnClassParameter(); |
| |
| /** |
| * Returns the CSS class of the generated table cell. It uses the class |
| * parameter if it has been bound, or the default value of "[column |
| * name]ColumnHeader" otherwise. |
| * |
| * @return the CSS class of the cell |
| */ |
| public String getColumnClass() |
| { |
| if (isParameterBound("class")) return getColumnClassParameter(); |
| |
| return getTableColumn().getColumnName() + TABLE_COLUMN_CSS_CLASS_SUFFIX; |
| } |
| |
| /** |
| * @see org.apache.tapestry.BaseComponent#renderComponent(IMarkupWriter, |
| * IRequestCycle) |
| */ |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| Object oldValueUp = cycle.getAttribute(TABLE_COLUMN_ARROW_UP_ATTRIBUTE); |
| Object oldValueDown = cycle |
| .getAttribute(TABLE_COLUMN_ARROW_DOWN_ATTRIBUTE); |
| |
| try |
| { |
| cycle.setAttribute(TABLE_COLUMN_ARROW_UP_ATTRIBUTE, |
| getArrowUpAsset()); |
| cycle.setAttribute(TABLE_COLUMN_ARROW_DOWN_ATTRIBUTE, |
| getArrowDownAsset()); |
| |
| super.renderComponent(writer, cycle); |
| } |
| finally |
| { |
| cycle.setAttribute(TABLE_COLUMN_ARROW_UP_ATTRIBUTE, oldValueUp); |
| cycle.setAttribute(TABLE_COLUMN_ARROW_DOWN_ATTRIBUTE, oldValueDown); |
| |
| // set the current column to null when the component is not active |
| m_objTableColumn = null; |
| } |
| } |
| |
| } |