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GWT - FlexTable Widget
Introduction
The FlexTable widget represents a flexible table that creates cells on demand. It can be jagged (that is, each row can contain a different number of cells) and individual cells can be set to span multiple rows or columns.
Class Declaration
Following is the declaration for com.google.gwt.user.client.ui.FlowPanel class −
public class FlexTable extends HTMLTable
Class Constructors
Sr.No. | Constructor & Description |
---|---|
1 |
FlexTable() Constructor for empty Flex Table. |
Class Methods
Sr.No. | Function name & Description |
---|---|
1 |
void addCell(int row) Appends a cell to the specified row. |
2 |
int getCellCount(int row) Gets the number of cells on a given row. |
3 |
FlexTable.FlexCellFormatter getFlexCellFormatter() Explicitly gets the FlexTable.FlexCellFormatter. |
4 |
int getRowCount() Gets the number of rows. |
5 |
void insertCell(int beforeRow, int beforeColumn) Inserts a cell into the FlexTable. |
6 |
int insertRow(int beforeRow) Inserts a row into the FlexTable. |
7 |
protected void prepareCell(int row, int column) Ensure that the cell exists. |
8 |
protected void prepareRow(int row) Ensure that the row exists. |
9 |
void removeAllRows() Remove all rows in this table. |
10 |
void removeCell(int row, int col) Removes the specified cell from the table. |
11 |
void removeCells(int row, int column, int num) Removes a number of cells from a row in the table. |
12 |
void removeRow(int row) Removes the specified row from the table. |
Methods Inherited
This class inherits methods from the following classes −
com.google.gwt.user.client.ui.UIObject
com.google.gwt.user.client.ui.Widget
com.google.gwt.user.client.ui.Panel
com.google.gwt.user.client.ui.HTMLTable
java.lang.Object
FlexTable Widget Example
This example will take you through simple steps to show usage of a FlexTable Widget in GWT. Follow the following steps to update the GWT application we created in GWT - Create Application chapter −
Step | Description |
---|---|
1 | Create a project with a name HelloWorld under a package com.tutorialspoint as explained in the GWT - Create Application chapter. |
2 | Modify HelloWorld.gwt.xml, HelloWorld.css, HelloWorld.html and HelloWorld.java as explained below. Keep rest of the files unchanged. |
3 | Compile and run the application to verify the result of the implemented logic. |
Following is the content of the modified module descriptor src/com.tutorialspoint/HelloWorld.gwt.xml.
<?xml version = "1.0" encoding = "UTF-8"?> <module rename-to = 'helloworld'> <!-- Inherit the core Web Toolkit stuff. --> <inherits name = 'com.google.gwt.user.User'/> <!-- Inherit the default GWT style sheet. --> <inherits name = 'com.google.gwt.user.theme.clean.Clean'/> <!-- Specify the app entry point class. --> <entry-point class = 'com.tutorialspoint.client.HelloWorld'/> <!-- Specify the paths for translatable code --> <source path = 'client'/> <source path = 'shared'/> </module>
Following is the content of the modified Style Sheet file war/HelloWorld.css.
body { text-align: center; font-family: verdana, sans-serif; } h1 { font-size: 2em; font-weight: bold; color: #777777; margin: 40px 0px 70px; text-align: center; } .flexTable td { border: 1px solid #BBBBBB; padding: 3px; } .flexTable-buttonPanel td { border: 0px; } .fixedWidthButton { width: 150px; }
Following is the content of the modified HTML host file war/HelloWorld.html.
<html> <head> <title>Hello World</title> <link rel = "stylesheet" href = "HelloWorld.css"/> <script language = "javascript" src = "helloworld/helloworld.nocache.js"> </script> </head> <body> <h1>FlexTable Widget Demonstration</h1> <div id = "gwtContainer"></div> </body> </html>
Let us have following content of Java file src/com.tutorialspoint/HelloWorld.java which will demonstrate use of FlexTable widget.
package com.tutorialspoint.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.DecoratorPanel; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HasVerticalAlignment; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.VerticalPanel; public class HelloWorld implements EntryPoint { public void onModuleLoad() { // Create a Flex Table final FlexTable flexTable = new FlexTable(); FlexCellFormatter cellFormatter = flexTable.getFlexCellFormatter(); flexTable.addStyleName("flexTable"); flexTable.setWidth("32em"); flexTable.setCellSpacing(5); flexTable.setCellPadding(3); // Add some text cellFormatter.setHorizontalAlignment( 0, 1, HasHorizontalAlignment.ALIGN_LEFT); flexTable.setHTML(0, 0, "This is a FlexTable that supports" +" <b>colspans</b> and <b>rowspans</b>." +" You can use it to format your page" +" or as a special purpose table."); cellFormatter.setColSpan(0, 0, 2); // Add a button that will add more rows to the table Button addRowButton = new Button("Add a Row"); addRowButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { addRow(flexTable); } }); addRowButton.addStyleName("fixedWidthButton"); // Add a button that will add more rows to the table Button removeRowButton = new Button("Remove a Row"); removeRowButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { removeRow(flexTable); } }); removeRowButton.addStyleName("fixedWidthButton"); VerticalPanel buttonPanel = new VerticalPanel(); buttonPanel.setStyleName("flexTable-buttonPanel"); buttonPanel.add(addRowButton); buttonPanel.add(removeRowButton); flexTable.setWidget(0, 1, buttonPanel); cellFormatter.setVerticalAlignment(0, 1, HasVerticalAlignment.ALIGN_TOP); // Add two rows to start addRow(flexTable); addRow(flexTable); // Add the widgets to the root panel. RootPanel.get().add(flexTable); } /** * Add a row to the flex table. */ private void addRow(FlexTable flexTable) { int numRows = flexTable.getRowCount(); flexTable.setWidget(numRows, 0, new Image("http://www.tutorialspoint.com/images/gwt-mini.png")); flexTable.setWidget(numRows, 1, new Image("http://www.tutorialspoint.com/images/gwt-mini.png")); flexTable.getFlexCellFormatter().setRowSpan(0, 1, numRows + 1); } /** * Remove a row from the flex table. */ private void removeRow(FlexTable flexTable) { int numRows = flexTable.getRowCount(); if (numRows > 1) { flexTable.removeRow(numRows - 1); flexTable.getFlexCellFormatter().setRowSpan(0, 1, numRows - 1); } } }
Once you are ready with all the changes done, let us compile and run the application in development mode as we did in GWT - Create Application chapter. If everything is fine with your application, this will produce following result −