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7: Rendering HTML with Java
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int listSize = pageList.size(); if (listSize > 0) { int pageIndex = pageList.indexOf(currentUrl.toString()); if (pageIndex < listSize - 1) { for (int i = listSize - 1; i > pageIndex; i--) { pageList.remove(i); } } } pageList.add(newUrl.toString()); }
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If the addToList flag is set to true, the page being displayed is added to the page list. First, the page list s size is retrieved. If the list has at least one page in it, the index of the page last displayed is retrieved. If this index is less than the size of the list, then all pages in the list after the page last displayed are removed. This is so that there are no longer any more pages to go forward to. Next, the user interface is updated, as shown here:
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// Update location text field with URL of current page. locationTextField.setText(newUrl.toString()); // Update buttons based on the page being displayed. updateButtons();
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First, the location text field is updated to reflect the current URL being displayed in the browser. Second, the updateButtons( ) method is called to enable or disable the Back and Forward buttons based on the position of the current page in the page list. If an exception is thrown while trying to load the new page, the catch block, shown in the following code, is executed:
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} catch (Exception e) { // Show error message. showError("Unable to load page"); }
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If an exception occurs, the showError( ) method is called to display an error message to the user. The showPage( ) method wraps up by specifying a finally clause for the try-catch block. The finally clause is used to ensure that the application cursor gets set back to its default state:
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finally {
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// Return to default cursor. setCursor(Cursor.getDefaultCursor()); }
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The updateButtons( ) Method
The updateButtons( ) method, shown here, updates the state of the Back and Forward buttons on the button panel based on the position inside the page list of the page currently being displayed. This method is invoked by the showPage( ) method each time a page is displayed:
/* Update Back and Forward buttons based on the page being displayed. */ private void updateButtons() { if (pageList.size() < 2) { backButton.setEnabled(false); forwardButton.setEnabled(false); } else { URL currentUrl = displayEditorPane.getPage(); int pageIndex = pageList.indexOf(currentUrl.toString()); backButton.setEnabled(pageIndex > 0); forwardButton.setEnabled( pageIndex < (pageList.size() - 1)); } }
If there are fewer than two pages in the page list, both the Back and Forward buttons are disabled, giving them a grayed-out appearance. This is because there are no pages to go back or forward to. However, if there are at least two pages in the page list, each button s state will be set based on where the page currently being displayed is relative to its position in the page list. If pageIndex is greater than 0, meaning that there are pages in the page list before the current page, the Back button is enabled. If the pageIndex is less than the number of pages in the page list minus 1 (since the index is 0-based), then the Forward button is enabled.
The hyperlinkUpdate( ) Method
The hyperlinkUpdate ( ) method is shown next. It fulfills the HyperlinkListener interface contract allowing the MiniBrowser class to receive notifications each time a hyperlink event, such as a hyperlink being clicked, occurs in the display editor pane.
// Handle hyperlinks being clicked. public void hyperlinkUpdate(HyperlinkEvent event) { HyperlinkEvent.EventType eventType = event.getEventType(); if (eventType == HyperlinkEvent.EventType.ACTIVATED) { if (event instanceof HTMLFrameHyperlinkEvent) { HTMLFrameHyperlinkEvent linkEvent = (HTMLFrameHyperlinkEvent) event;
7: Rendering HTML with Java
HTMLDocument document = (HTMLDocument) displayEditorPane.getDocument(); document.processHTMLFrameHyperlinkEvent(linkEvent); } else { showPage(event.getURL(), true); } } }
The hyperlinkUpdate( ) method is passed a HyperlinkEvent object that encapsulates all of the information related to the hyperlink event that has occurred. First, the event s type is checked to see if it is ACTIVATED, which specifies that the link has been clicked. Next, the event is checked to see if it is an instance of HTMLFrameHyperlinkEvent, which indicates that a link within an HTML frame was clicked. If so, the event is cast to HTMLFrameHyperlinkEvent and stored in linkEvent. Next, the call to displayEditorPane .getDocument( ) obtains the document instance associated with the page. In this case, the document is of type HTMLDocument. Finally, processHTMLFrameHyperlinkEvent( ) is called with linkEvent as an argument. This process allows links inside of HTML frames to be processed. If the event is not an HTMLFrameHyperlinkEvent, the link is a standard link and its URL is obtained by calling getURL( ). The page associated with this URL is then displayed in the editor pane by calling showPage( ).
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