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What Just Happened in Java Integrate Code 128C in Java What Just Happened




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7. generate, create code128b none with java projects iReport for Jasper Server Run the application USS Code 128 for Java to see the calendar widget in action:. What Just Happened A custom widget enca Code 128C for Java psulates functionality and enables reuse across multiple projects. There are three ways to create a custom GWT widget: Composite: Composite is a special GWT class that is itself a widget, and can act as a container for other widgets. This lets us easily compose a complex widget comprising any number of components.

Java: Create a widget from scratch similar to the way all the basic widgets of GWT, such as Button are written. JavaScript: Implement a widget whose methods call JavaScript. This method should be chosen carefully, as the code will need to be written to carefully consider the cross-browser implications.

. Normal GWT widgets a re just wrappers around HTML elements. A composite widget is a complex widget composed of several simple widgets. It controls the methods that are publicly accessible to the clients of the widget.

You can, thus, expose only the events that you want. Composite is the simplest and quickest way to build a widget. In this example, we create a calendar widget by extending the.

[ 165 ]. Custom Widgets Composite class, and adding various components to it. The calendar consists of two main panels the one on the left displays the weekday and the actual date, while the panel on the right displays the actual calendar along with the buttons for navigating forward and backward through the calendar. You can use these buttons to go to a different date. Anytime you want to return to the calendar for today"s date, click on the Today button, and the calendar will again be rendered for the current date.

We created a container named HorizontalPanel that contains the various components of the calendar widget. This panel is given a nice rounded corner effect by using the Rico library that we created in the previous chapter..

DOM.setAttribute(hpa swing ANSI/AIM Code 128 nel.getElement(), "id", "calDiv"); DOM.

setAttribute(hpanel.getElement(), "className", "CalendarWidgetHolder"); Rico.corner(hpanel.

getElement(), null);. For the calendar, we used a Grid object with seven rows and seven columns. We overrode its clearCell() method to clear the contents of the cell by setting the text for the TD element to an empty string:. public boolean clear Code 128 Code Set A for Java Cell(int row, int column) { boolean retValue = super.clearCell(row, column); Element td = getCellFormatter().getElement(row, column); DOM.

setInnerHTML(td, ""); return retValue; }. This grid was create d by populating each of its cells with CalendarCell. This is a custom class that we created where each of the cells can take an HTML snippet as the text, and lets us lay out a much better grid..

private static class USS Code 128 for Java calendarCell extends HTML { private int day; public calendarCell(String cellText, int day) { super(cellText); this.day = day; } public int getDay() { return day; } } [ 166 ]. 7 . The renderCalendar() servlet code-128c method does the bulk of the work in this widget. It sets the values for the weekday and the date, and also draws the calendar itself. When we create the calendar grid, we set the styles for each individual cell.

If the cell happens to be the current date, we set it to a different style; so visually we can immediately discern the current date by just looking at the grid. When the calendar widget is initialized, it automatically draws the calendar for the current date. The navigation bar contains two buttons one for navigating forward to go to the next month, and the other button for navigating backward to the previous month.

When one of the two navigation buttons is clicked, we redraw the calendar. So, for instance, when we click on the previous button, we compute the previous month and redraw the calendar:. public void computeC alendarForPreviousMonth() { int month = getMonth() - 1; if (month < 0) { setDate(getYear() - 1, 11, getDay()); } else { setMonth(month); } renderCalendar(); }. We also added a butt tomcat ANSI/AIM Code 128 on to the calendar so as to let us redraw the calendar to the current date. After navigating either forward or backward in the calendar, we can click on the Today button, and have the calendar rendered for the current date:. todayButton.addClick Listener(new ClickListener() { public void onClick(Widget sender) { currentDate = new Date(); renderCalendar(); } });. We utilized the buil Code 128 Code Set B for Java t-in functionality in Eclipse to export our widget resources as a JAR file. This JAR file can be shared among teams or projects, and reused. We used this exported widgets.

jar file in our Samples project, by creating a simple panel, instantiating the calendar widget, and adding it to the panel. The file also needs to be added to the compile and shell batch files for the project; so that it can be found on the classpath when either of these commands is run. We could have done some of the date manipulation in a simpler way by using the Calendar class that is available.

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