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7: Rendering HTML with Java
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The MiniBrowser Constructor
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When MiniBrowser is instantiated, all the interface controls are initialized inside its constructor. The constructor contains a lot of code, but most of it is straightforward. The following discussion gives an overview. First, the window title is set. Next, the call to setSize( ) establishes the window s width and height in pixels. After that, a window listener is added by calling addWindowListener( ), passing a WindowAdapter object that overrides the windowClosing( ) event handler. This handler calls the actionExit( ) method when the window is closed. Next, a menu bar with a File menu is added to the window. Similar to other applications in this book, the next several lines of the constructor initialize and lay out the interface controls. First, the button panel is set up. The button panel contains the Back, Forward, and Go buttons, along with the location text field. An ActionListener is added to each of the buttons so that the corresponding action method is called each time the button is clicked. Similarly, a KeyAdapter is added to the location text field so that the actionGo( ) method is invoked each time the ENTER key is pressed inside the text field. The editor pane for displaying pages is set up next. There are three things to take note of here. First, the editor s content type is set to "text/html", which causes the editor to display HTML pages. Second, the setEditable( ) method is passed a false flag to indicate that the editor should not allow its contents to be edited, which enables the HTML tags to be rendered. Third, displayEditorPane.addHyperlinkListener( ) is called to register the browser to receive HyperlinkEvents. The MiniBrowser constructor ends by adding the button panel and editor pane to the interface. Notice that the editor pane is wrapped in a JScrollPane instance. This makes the editor pane scrollable.
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The actionBack( ) Method
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The actionBack( ) method, shown here, is invoked each time the Back button is clicked and is used for navigating back a page in the list of pages that have been visited in the browser:
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// Go back to the page viewed before the current page. private void actionBack() { URL currentUrl = displayEditorPane.getPage(); int pageIndex = pageList.indexOf(currentUrl.toString()); try { showPage( new URL((String) pageList.get(pageIndex - 1)), false); } catch (Exception e) {} }
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This method first retrieves the URL of the page currently being displayed in the browser by calling displayEditorPane.getPage( ). Next, the page s index in the page list is retrieved by using the indexOf( ) method of ArrayList. It takes an object reference and returns the
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index for the object in the list. Finally, showPage( ) is called to display the previous page, which is one page back from the current page. Notice that false is passed as the second argument to the showPage( ) method. This specifies that the page being displayed should not be added to the page list, because it is not a new page and is already in the list. The showPage( ) call is wrapped in a try-catch block because the URL constructor can throw an exception if something goes wrong in the creation of the URL from a string. Since all the pages in the page list have already been run through the verifyUrl( ) method, the catch block is left empty.
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The actionForward( ) Method
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The actionForward( ) method, shown here, is invoked each time the Forward button is clicked and is used for navigating forward a page in the list of pages that have been visited in the browser:
// Go forward to the page viewed after the current page. private void actionForward() { URL currentUrl = displayEditorPane.getPage(); int pageIndex = pageList.indexOf(currentUrl.toString()); try { showPage( new URL((String) pageList.get(pageIndex + 1)), false); } catch (Exception e) {} }
The same as actionBack( ), this method first retrieves the URL of the page currently being displayed in the browser by calling displayEditorPane.getPage( ). Next, the page s index in the page list is retrieved by using the indexOf( ) method of ArrayList. It then takes an object reference and returns the index for the object in the list. Finally, showPage( ) is called to display the next page, which is one page forward from the current page. Notice that false is passed as the second argument to the showPage( ) method. This specifies that the page being displayed should not be added to the page list, because it is not a new page and is already in the list. The showPage( ) call is wrapped in a try-catch block because the URL constructor can throw an exception if something goes wrong in the creation of the URL from a string. Since all the pages in the page list have already been run through the verifyUrl( ) method, the catch block is left empty.
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