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The set of useful GWT components
/*
* Copyright 2008-2012 Sergey Skladchikov
*
* 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.gwt.advanced.client.ui.widget;
import org.gwt.advanced.client.datamodel.*;
import org.gwt.advanced.client.ui.GridListener;
import org.gwt.advanced.client.ui.GridToolbarListener;
import org.gwt.advanced.client.ui.PagerListener;
import org.gwt.advanced.client.ui.SelectRowListener;
import org.gwt.advanced.client.ui.widget.cell.GridCell;
import org.gwt.advanced.client.ui.widget.cell.HeaderCell;
import java.util.ArrayList;
import java.util.List;
/**
* This is an event mediator class developer for centralized grid panel subcomponents
* interoperability.
*
* @author Sergey Skladchikov
* @since 1.0.0
*/
public class EventMediator implements PagerListener, GridListener, GridToolbarListener, SelectRowListener, EditableModelListener {
/** a grid panel */
private GridPanel panel;
/** pager listeners set */
private List pagerListeners;
/** grid listeners set */
private List gridListeners;
/** toolbar listeners set */
private List toolbarListeners;
/**
* Creates an instance of the mediator and initializes the internal fields.
*
* @param panel is a grid panel.
*/
public EventMediator (GridPanel panel) {
this.panel = panel;
}
/** {@inheritDoc} */
public void onPageChange (Pager sender, int page) {
GridPanel gridPanel = getPanel();
if (
gridPanel.isTopPagerVisible() && gridPanel.getTopPager() == sender
&& gridPanel.isBottomPagerVisible()
){
gridPanel.getBottomPager().display();
} else if (
gridPanel.isBottomPagerVisible() && gridPanel.getBottomPager() == sender
&& gridPanel.isTopPagerVisible()
) {
gridPanel.getTopPager().display();
}
EditableGrid grid = gridPanel.getGrid();
if (grid instanceof HierarchicalGrid)
((HierarchicalGrid)grid).getGridPanelCache().clear();
grid.synchronizeDataModel();
}
/** {@inheritDoc} */
public void onSort (HeaderCell cell, GridDataModel dataModel) {
GridPanel gridPanel = getPanel();
if (gridPanel.isTopPagerVisible())
gridPanel.getTopPager().display();
if (gridPanel.isBottomPagerVisible())
gridPanel.getBottomPager().display();
EditableGrid grid = getPanel().getGrid();
if (!grid.isSorted(cell.getColumn())) {
dataModel.setAscending(true);
dataModel.setSortColumn(cell.getColumn());
} else {
dataModel.setAscending(!dataModel.isAscending());
}
grid.drawHeaders();
grid.sortOnClient();
}
/** {@inheritDoc} */
public void onSave (GridDataModel dataModel) {
GridPanel gridPanel = getPanel();
if (gridPanel.isTopPagerVisible())
setCurrentPageNumber(dataModel, gridPanel.getTopPager());
if (gridPanel.isBottomPagerVisible())
setCurrentPageNumber(dataModel, gridPanel.getBottomPager());
gridPanel.getGrid().synchronizeDataModel();
}
/** {@inheritDoc} */
public void onClear (GridDataModel dataModel) {
GridPanel gridPanel = getPanel();
if (gridPanel.isTopPagerVisible())
setCurrentPageNumber(dataModel, gridPanel.getTopPager());
if (gridPanel.isBottomPagerVisible())
setCurrentPageNumber(dataModel, gridPanel.getBottomPager());
}
/** {@inheritDoc} */
public void onAddClick () {
getPanel().getGrid().addRow();
}
/** {@inheritDoc} */
public void onRemoveClick () {
getPanel().getGrid().removeRow();
}
/** {@inheritDoc} */
public void onSaveClick () {
EditableGrid grid = getPanel().getGrid();
boolean active = grid.hasActiveCell();
if (active) {
GridCell cell = (GridCell) grid.getWidget(grid.getCurrentRow(), grid.getCurrentColumn());
if (grid.fireFinishEdit(cell, cell.getNewValue())) {
grid.activateCell(grid.getCurrentRow(), grid.getCurrentColumn(), false);
} else {
return;
}
}
Editable model = grid.getModel();
fireSaveEvent(model);
if (grid instanceof HierarchicalGrid)
((HierarchicalGrid)grid).getGridPanelCache().clear();
if (active) {
grid.setCurrentCell(0, 0);
}
}
/** {@inheritDoc} */
public void onClearClick () {
EditableGrid grid = getPanel().getGrid();
Editable dataModel = grid.getModel();
dataModel.removeAll();
grid.getSelectionModel().clear();
fireClearEvent(dataModel);
if (grid instanceof HierarchicalGrid)
((HierarchicalGrid)grid).getGridPanelCache().clear();
}
/** {@inheritDoc} */
public void onSelect(EditableGrid grid, int row) {
for (GridPanel gridPanel : getPanel().getChildGridPanels())
gridPanel.getGrid().synchronizeDataModel();
}
/**
* This method fires page change event.
*
* @param pager is a pager which is a source of the event.
* @param page is a new page number.
*/
public void firePageChangeEvent(Pager pager, int page) {
for (PagerListener listener : getPagerListeners())
listener.onPageChange(pager, page);
}
/**
* This method fires grid changes saving event.
*
* @param model is a grid data model.
*/
public void fireSaveEvent(GridDataModel model) {
for (GridListener listener : getGridListeners())
listener.onSave(model);
}
/**
* This method fires sorting event.
*
* @param cell is a header cell.
* @param model is a grid data model.
*/
public void fireSortEvent(HeaderCell cell, GridDataModel model) {
for (GridListener listener : getGridListeners())
listener.onSort(cell, model);
}
/**
* This method fires the cleaning event.
*
* @param model is a grid data model.
*/
public void fireClearEvent(GridDataModel model) {
for (GridListener listener : getGridListeners())
listener.onClear(model);
}
/**
* This method fires the add item event.
*/
protected void fireAddRowEvent() {
for (GridToolbarListener gridToolbarListener : getToolbarListeners())
gridToolbarListener.onAddClick();
}
/**
* This method fires the remove item event.
*/
protected void fireRemoveRowEvent() {
for (GridToolbarListener gridToolbarListener : getToolbarListeners())
gridToolbarListener.onRemoveClick();
}
/**
* This method fires the save event.
*/
protected void fireSaveEvent () {
for (GridToolbarListener gridToolbarListener : getToolbarListeners())
gridToolbarListener.onSaveClick();
}
/**
* This method fires the clear items event.
*/
protected void fireClearEvent() {
for (GridToolbarListener gridToolbarListener : getToolbarListeners())
gridToolbarListener.onClearClick();
}
/**
* Fires the move left click event.
*/
protected void fireMoveLeftEvent() {
for (GridToolbarListener gridToolbarListener : getToolbarListeners())
gridToolbarListener.onMoveLeftClick();
}
/**
* Fires the move right click event.
*/
protected void fireMoveRightEvent() {
for (GridToolbarListener gridToolbarListener : getToolbarListeners())
gridToolbarListener.onMoveRightClick();
}
/** {@inheritDoc} */
public void onMoveLeftClick() {
TreeGrid grid = (TreeGrid) getPanel().getGrid();
grid.moveLeft();
}
/** {@inheritDoc} */
public void onMoveRightClick() {
TreeGrid grid = (TreeGrid) getPanel().getGrid();
grid.moveRight();
}
/**
* This method adds a pager listener.
*
* @param listener is a pager listener.
*/
public void addPagerListener(PagerListener listener) {
List list = getPagerListeners();
if (!list.contains(listener))
list.add(listener);
}
/**
* This method removes a pager listener.
*
* @param listener is a pager listener.
*/
public void removePagerListener(PagerListener listener) {
getPagerListeners().remove(listener);
}
/**
* This method adds a grid listener.
*
* @param listener is a pager listener.
*/
public void addGridListener(GridListener listener) {
List list = getGridListeners();
if (!list.contains(listener))
list.add(listener);
}
/**
* This method removes a grid listener.
*
* @param listener is a grid listener.
*/
public void removeGridListener(GridListener listener) {
getGridListeners().remove(listener);
}
/**
* This method adds a toolbar listener.
*
* @param listener is a toolbar listener.
*/
public void addToolbarListener(GridToolbarListener listener) {
List list = getToolbarListeners();
if (!list.contains(listener))
list.add(listener);
}
/**
* This method removes a toolbar listener.
*
* @param listener is a toolbar listener.
*/
public void removeToolbarListener(GridToolbarListener listener) {
getToolbarListeners().remove(listener);
}
/**
* This method dispatches the model events and invokes appropriate methods of the related grid.
*
* @param event is an event to be dispatched.
*/
public void onModelEvent(EditableModelEvent event) {
Object type = event.getEventType();
EditableGrid grid = getPanel().getGrid();
if (type == EditableModelEvent.SORT_ALL || type == EditableModelEvent.UPDATE_ALL) {
grid.synchronizeView(event);
} else if (type == EditableModelEvent.ADD_ROW) {
grid.drawRow(event);
if (getPanel().isTopPagerVisible())
getPanel().getTopPager().display();
if (getPanel().isBottomPagerVisible())
getPanel().getBottomPager().display();
} else if (type == EditableModelEvent.UPDATE_ROW) {
grid.drawRow(event);
} else if (type == EditableModelEvent.UPDATE_CELL || type == HierarchicalModelEvent.ADD_SUBGRID || type == HierarchicalModelEvent.REMOVE_SUBGRID) {
grid.drawCell(event);
} else if (type == EditableModelEvent.REMOVE_ROW) {
grid.deleteRow(event);
if (getPanel().isTopPagerVisible())
getPanel().getTopPager().display();
if (getPanel().isBottomPagerVisible())
getPanel().getBottomPager().display();
} else if (type == EditableModelEvent.CLEAN) {
grid.synchronizeDataModel();
} else if (type == HierarchicalModelEvent.CELL_EXPANDED) {
((HierarchicalGrid)grid).drawSubgrid(event);
} else if (type == HierarchicalModelEvent.CELL_COLLAPSED) {
((HierarchicalGrid)grid).deleteSubgrid(event);
} else if (type == CompositeModelEvent.CLEAN_SUBTREE) {
((TreeGrid)grid).removeSubtree(event);
}
}
/**
* Getter for property 'panel'.
*
* @return Value for property 'panel'.
*/
protected GridPanel getPanel () {
return panel;
}
/**
* Getter for property 'pagerListeners'.
*
* @return Value for property 'pagerListeners'.
*/
protected List getPagerListeners () {
if (pagerListeners == null)
pagerListeners = new ArrayList();
return pagerListeners;
}
/**
* Getter for property 'gridListeners'.
*
* @return Value for property 'gridListeners'.
*/
protected List getGridListeners () {
if (gridListeners == null)
gridListeners = new ArrayList();
return gridListeners;
}
/**
* Getter for property 'toolbarListeners'.
*
* @return Value for property 'toolbarListeners'.
*/
protected List getToolbarListeners () {
if (toolbarListeners == null)
toolbarListeners = new ArrayList();
return toolbarListeners;
}
/**
* This method sets a curent page number.
*
* @param model is a grid data model
* @param pager is a pager instance.
*/
protected void setCurrentPageNumber (GridDataModel model, Pager pager) {
int pageNumber = model.getCurrentPageNumber();
if (model.isEmpty())
pageNumber = 0;
pager.setCurrentPageNumber(pageNumber);
}
}
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