Azureus源碼剖析（五）

這篇說說GUI方面，就以打開種子檔案這個視窗為例，我對其代碼進行了精簡，拿出了一個基本的骨架。

首先來看基本的消息主循環部分：

複制代碼

final Display display = new Display();

invoke(null);//建立視窗的主代碼

while (stTorrentWindow != null && !stTorrentWindow.bClosed)

{//視窗建立完成且沒有關閉

if (!display.readAndDispatch())

{

display.sleep();

}

display.dispose();

這裡運用了單例模式來表示視窗，考慮到線程同步性，在靜态工廠方法中使用了synchronized 關鍵字

private static TorrentWindow stTorrentWindow = null;

public synchronized static final void invoke(Shell parent)

{

if (stTorrentWindow == null)

{//第一次建立視窗

stTorrentWindow = new TorrentWindow(parent);

else

{//激活已經建立的視窗

if (stTorrentWindow.shell != null)

stTorrentWindow.shell.forceActive();

}

private TorrentWindow(final Shell parent)

openWindow(parent);

真正的視窗建立工作是在openWindow方法中完成的，下面給出部分核心代碼：

private void openWindow(Shell parent)

GridData gridData;

shell = ShellFactory.createShell(parent, SWT.RESIZE | SWT.DIALOG_TRIM);

shell.setText("打開 Torrent");

GridLayout layout = new GridLayout();

shell.setLayout(layout);

shell.addListener(SWT.Resize, new Listener()

{

public void handleEvent(Event e) {

});

// Torrents

// ========

Composite cButtons = new Composite(shell, SWT.NONE);

RowLayout rLayout = new RowLayout(SWT.HORIZONTAL);

rLayout.marginBottom = 0;

rLayout.marginLeft = 0;

rLayout.marginRight = 0;

rLayout.marginTop = 0;

cButtons.setLayout(rLayout);

// Buttons for tableTorrents

Button browseTorrent = new Button(cButtons, SWT.PUSH);

browseTorrent.setText("添加檔案");

browseTorrent.addListener(SWT.Selection, new Listener(){

public void handleEvent(Event arg0) {

FileDialog fDialog = new FileDialog(shell, SWT.OPEN | SWT.MULTI);

fDialog.setFilterExtensions(new String[]{

"*.torrent",

"*.tor",

FILE_WILDCARD

});

fDialog.setFilterNames(new String[]{

fDialog.setText("選擇 Torrent檔案");

String fileName = fDialog.open();

if (fileName != null)

{

//addTorrents(fDialog.getFilterPath(), fDialog.getFileNames());

}

setGridData(cButtons, GridData.FILL_HORIZONTAL, browseTorrent, MIN_BUTTON_HEIGHT);

Button browseURL = new Button(cButtons, SWT.PUSH);

browseURL.setText("從URL添加");

browseURL.addListener(SWT.Selection, new Listener(){

browseURL();

Button browseFolder = new Button(cButtons, SWT.PUSH);

browseFolder.setText("從檔案夾添加");

browseFolder.addListener(SWT.Selection, new Listener(){

public void handleEvent(Event e)

DirectoryDialog fDialog = new DirectoryDialog(shell, SWT.NULL);

fDialog.setMessage("選擇 Torrent 檔案所在目錄");

String path = fDialog.open();

if (path != null)

addTorrents(path, null);

Group gTorrentsArea = new Group(shell, SWT.NONE);

gridData = new GridData(GridData.FILL_HORIZONTAL);

gTorrentsArea.setLayoutData(gridData);

layout = new GridLayout();

gTorrentsArea.setLayout(layout);

gTorrentsArea.setText("Torrent檔案");

Composite cTorrentList = new Composite(gTorrentsArea, SWT.NONE);

cTorrentList.setLayoutData(gridData);

createTorrentListArea(cTorrentList);

//關閉視窗

shell.addDisposeListener(new DisposeListener()

public void widgetDisposed(DisposeEvent e)

if (!bClosed)

close(false, true);

shell.addListener(SWT.Traverse, new Listener()

public void handleEvent(Event e)

if (e.detail == SWT.TRAVERSE_ESCAPE)

close(true, true);

shell.open();//顯示視窗

這裡最重要的如何建立Shell的：

shell = ShellFactory.createShell(parent, SWT.RESIZE | SWT.DIALOG_TRIM);

下面就來看看ShellFactory的代碼，主要是在ShellManager中加入新建立的Shell,如果此Shell已經建立過，則不再次加入

public final class ShellFactory

{

public static Shell createShell(final Shell parent, final int styles)

return getRegistedShell(new Shell(parent, styles));

private static Shell getRegistedShell(final Shell toRegister)

if (null == toRegister)

return null;

ShellManager.sharedManager().addWindow(toRegister);

return toRegister;

}

最後來看ShellManager是如何管理Shell的：

public class ShellManager

private static ShellManager instance;

private final Collection shells = new ArrayList();//被管理的Shell

private final List addHandlers = new LinkedList();//加入Shell時調用

private final List removeHandlers = new LinkedList();//删除Shell時調用

static

instance = new ShellManager();

/**

* Gets the application's shared shell manager

* This ShellManager has no bearing on other ShellManager instances

* Note: This method must be invoked by the SWT display thread

* @return

public static final ShellManager sharedManager()

{//靜态工廠方法

return instance;

public static boolean verifyShellRect(Shell shell, boolean bAdjustIfInvalid)

{//驗證視窗矩陣的合法性

boolean bMetricsOk;

try {

bMetricsOk = false;

Point ptTopLeft = shell.getLocation();

Monitor[] monitors = shell.getDisplay().getMonitors();

for (int j = 0; j < monitors.length && !bMetricsOk; j++) {

Rectangle bounds = monitors[j].getBounds();

bMetricsOk = bounds.contains(ptTopLeft);

} catch (NoSuchMethodError e) {

Rectangle bounds = shell.getDisplay().getBounds();

bMetricsOk = shell.getBounds().intersects(bounds);

if (!bMetricsOk && bAdjustIfInvalid) {

centreWindow(shell);

return bMetricsOk;

public static void centreWindow(Shell shell)

{//視窗居中

Rectangle displayArea; // area to center in

displayArea = shell.getMonitor().getClientArea();

displayArea = shell.getDisplay().getClientArea();

Rectangle shellRect = shell.getBounds();

if (shellRect.height > displayArea.height) {

shellRect.height = displayArea.height;

if (shellRect.width > displayArea.width - 50) {

shellRect.width = displayArea.width;

shellRect.x = displayArea.x + (displayArea.width - shellRect.width) / 2;

shellRect.y = displayArea.y + (displayArea.height - shellRect.height) / 2;

shell.setBounds(shellRect);

* Adds a shell to the shell manager. If the shell is already managed, it is not added again.

* @param shell A SWT Shell

public final void addWindow(final Shell shell)

{//加入新視窗

//Debug.out("Invoked by thread " + Thread.currentThread().getName());

if(shells.contains(shell)) {return;}

shells.add(shell);

notifyAddListeners(shell);

shell.addDisposeListener(new DisposeListener()

public void widgetDisposed(DisposeEvent event)

try

removeWindow(shell);

}

catch (Exception e)

//Logger.log(new LogEvent(LogIDs.GUI, "removeWindow", e));

shell.addListener(SWT.Show, new Listener()

public void handleEvent(Event event)

verifyShellRect(shell, false);

* Removes a shell from the shell manager

public final void removeWindow(Shell shell)

{//删除視窗

shells.remove(shell);

notifyRemoveListeners(shell);

* Gets the shells managed by the manager as an Iterator

* The order in which the shells were added are retained.

* @return The iterator

public final Iterator getWindows()

return shells.iterator();

* Gets whether the ShellManager manages no shells

* @return True if ShellManager is empty

public final boolean isEmpty()

return shells.isEmpty();

* Gets the number of shells the ShellManager manages

* @return The number

public final int getSize()

return shells.size();

* Invokes the handleEvent method specified by the SWT listener for each managed shell

* The event's widget is set to the reference of the shell invoking it

* @param command A command implemented as a SWT Listener

public final void performForShells(final Listener command)

Iterator iter = shells.iterator();

for(int i = 0; i < shells.size(); i++)

Shell aShell = (Shell)iter.next();

Event evt = new Event();

evt.widget = aShell;

evt.data = this;

command.handleEvent(evt);

* Gets the set of managed shells

* @return The set

protected final Collection getManagedShellSet()

return shells;

// events

* Adds a listener that will be invoked when a shell has been added to the ShellManager

* The listener and the shell will automatically be removed when the shell is disposed

* @param listener A SWT Listener

public final void addWindowAddedListener(Listener listener)

addHandlers.add(listener);

* Removes a listener that will be invoked when a shell has been added to the ShellManager

public final void removeWindowAddedListener(Listener listener)

addHandlers.remove(listener);

* Adds a listener that will be invoked when a shell has been removed from the ShellManager

public final void addWindowRemovedListener(Listener listener)

removeHandlers.add(listener);

* Removes a listener that will be invoked when a shell has been removed from the ShellManager

public final void removeWindowRemovedListener(Listener listener)

removeHandlers.remove(listener);

* Notifies the WindowAddedListener handlers

* @param sender A SWT shell that "sends" the events

protected final void notifyAddListeners(Shell sender)

Iterator iter = addHandlers.iterator();

for(int i = 0; i < addHandlers.size(); i++)

((Listener)iter.next()).handleEvent(getSWTEvent(sender));

* Notifies the WindowRemovedListener handlers

protected final void notifyRemoveListeners(Shell sender)

Iterator iter = removeHandlers.iterator();

for(int i = 0; i < removeHandlers.size(); i++)

* Gets a generated SWT Event based on the shell

* The widget field of the event should be set to the shell

* @return The event

protected Event getSWTEvent(Shell shell)

Event e = new Event();

e.widget = shell;

e.item = shell;

return e;

本文轉自Phinecos(洞庭散人)部落格園部落格，原文連結：http://www.cnblogs.com/phinecos/archive/2009/05/13/1455756.html，如需轉載請自行聯系原作者

Azureus源碼剖析（五）

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