// 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 org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.contrib.table.model.ITableModelSource;
import org.apache.tapestry.util.ComponentAddress;
/**
* A low level Table component that renders the pages in the table.
* This component must be wrapped by {@link org.apache.tapestry.contrib.table.components.TableView}.
* <p>
* The component generates a list of pages in the Table centered around the
* current one and allows you to navigate to other pages.
* <p>
* Please see the Component Reference for details on how to use this component.
*
* [<a href="../../../../../../../ComponentReference/contrib.TablePages.html">Component Reference</a>]
*
* @author mindbridge
*
*/
public abstract class TablePages extends AbstractTableViewComponent
{
// Transient
private int m_nDisplayPage;
// Bindings
public abstract int getPagesDisplayed();
/**
* Returns the displayPage.
* @return int
*/
public int getDisplayPage()
{
return m_nDisplayPage;
}
/**
* Sets the displayPage.
* @param displayPage The displayPage to set
*/
public void setDisplayPage(int displayPage)
{
m_nDisplayPage = displayPage;
}
public int getCurrentPage()
{
return getTableModelSource().getTableModel().getPagingState().getCurrentPage() + 1;
}
public int getPageCount()
{
return getTableModelSource().getTableModel().getPageCount();
}
public boolean getCondBack()
{
return getCurrentPage() > 1;
}
public boolean getCondFwd()
{
return getCurrentPage() < getPageCount();
}
public boolean getCondCurrent()
{
return getDisplayPage() == getCurrentPage();
}
public int getStartPage()
{
int nCurrent = getCurrentPage();
int nPagesDisplayed = getPagesDisplayed();
int nRightMargin = nPagesDisplayed / 2;
int nStop = nCurrent + nRightMargin;
int nLastPage = getPageCount();
int nLeftAddon = 0;
if (nStop > nLastPage)
nLeftAddon = nStop - nLastPage;
int nLeftMargin = (nPagesDisplayed - 1) / 2 + nLeftAddon;
int nStart = nCurrent - nLeftMargin;
int nFirstPage = 1;
if (nStart < nFirstPage)
nStart = nFirstPage;
return nStart;
}
public int getStopPage()
{
int nCurrent = getCurrentPage();
int nPagesDisplayed = getPagesDisplayed();
int nLeftMargin = (nPagesDisplayed - 1) / 2;
int nStart = nCurrent - nLeftMargin;
int nFirstPage = 1;
int nRightAddon = 0;
if (nStart < nFirstPage)
nRightAddon = nFirstPage - nStart;
int nRightMargin = nPagesDisplayed / 2 + nRightAddon;
int nStop = nCurrent + nRightMargin;
int nLastPage = getPageCount();
if (nStop > nLastPage)
nStop = nLastPage;
return nStop;
}
public Integer[] getPageList()
{
int nStart = getStartPage();
int nStop = getStopPage();
Integer[] arrPages = new Integer[nStop - nStart + 1];
for (int i = nStart; i <= nStop; i++)
arrPages[i - nStart] = new Integer(i);
return arrPages;
}
public Object[] getFirstPageContext()
{
ComponentAddress objAddress = new ComponentAddress(getTableModelSource());
return new Object[] { objAddress, new Integer(1)};
}
public Object[] getLastPageContext()
{
ComponentAddress objAddress = new ComponentAddress(getTableModelSource());
return new Object[] { objAddress, new Integer(getPageCount())};
}
public Object[] getBackPageContext()
{
ComponentAddress objAddress = new ComponentAddress(getTableModelSource());
return new Object[] { objAddress, new Integer(getCurrentPage() - 1)};
}
public Object[] getFwdPageContext()
{
ComponentAddress objAddress = new ComponentAddress(getTableModelSource());
return new Object[] { objAddress, new Integer(getCurrentPage() + 1)};
}
public Object[] getDisplayPageContext()
{
ComponentAddress objAddress = new ComponentAddress(getTableModelSource());
return new Object[] { objAddress, new Integer(m_nDisplayPage)};
}
public void changePage(IRequestCycle objCycle)
{
Object[] arrParameters = objCycle.getListenerParameters();
if (arrParameters.length != 2
&& !(arrParameters[0] instanceof ComponentAddress)
&& !(arrParameters[1] instanceof Integer))
{
// error
return;
}
ComponentAddress objAddress = (ComponentAddress)arrParameters[0];
ITableModelSource objSource = (ITableModelSource)objAddress.findComponent(objCycle);
int page = ((Integer)arrParameters[1]).intValue();
objSource.storeTableAction(new TableActionPageChange(page));
}
public void setCurrentPage(ITableModelSource objSource, int nPage)
{
objSource.getTableModel().getPagingState().setCurrentPage(nPage - 1);
}
}