SWT源码分析(4)

2012-12-20

SWT源码分析(四)接上文。?同理，shell.setSize(200, 100)方法最后调用的是OS.SetWindowPos函数设置窗口的位

SWT源码分析(四)

接上文。

同理，shell.setSize(200, 100);方法最后调用的是OS.SetWindowPos函数设置窗口的位置：

SWT源码分析(4)

窗口现在创建完了，还要显示和更新，现在进入shell.open()方法：

public void open () {checkWidget ();STARTUPINFO lpStartUpInfo = Display.lpStartupInfo;if (lpStartUpInfo == null || (lpStartUpInfo.dwFlags & OS.STARTF_USESHOWWINDOW) == 0) {bringToTop ();if (isDisposed ()) return;}......setVisible (true);......}

?在进入setVisible(boolean visible)方法：

public void setVisible (boolean visible) {checkWidget ();        .......int mask = SWT.PRIMARY_MODAL | SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL;if ((style & mask) != 0) {if (visible) {display.setModalShell (this);if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {display.setModalDialog (null);}Control control = display._getFocusControl ();if (control != null && !control.isActive ()) {bringToTop ();if (isDisposed ()) return;}int /*long*/ hwndShell = OS.GetActiveWindow ();if (hwndShell == 0) {if (parent != null) hwndShell = parent.handle;}if (hwndShell != 0) {OS.SendMessage (hwndShell, OS.WM_CANCELMODE, 0, 0);}OS.ReleaseCapture ();} else {display.clearModal (this);}} else {updateModal ();}.......super.setVisible (visible);        .......}

?又调用了父类Decorations的setVisble(boolean visible)方法：

public void setVisible (boolean visible) {checkWidget ();if (!getDrawing()) {if (((state & HIDDEN) == 0) == visible) return;} else {if (visible == OS.IsWindowVisible (handle)) return;}if (visible) {/** It is possible (but unlikely), that application* code could have disposed the widget in the show* event.  If this happens, just return.*/sendEvent (SWT.Show);if (isDisposed ()) return;if (OS.IsHPC) {if (menuBar != null) {int /*long*/ hwndCB = menuBar.hwndCB;OS.CommandBar_DrawMenuBar (hwndCB, 0);}}if (!getDrawing()) {state &= ~HIDDEN;} else {if (OS.IsWinCE) {OS.ShowWindow (handle, OS.SW_SHOW);} else {if (menuBar != null) {display.removeBar (menuBar);OS.DrawMenuBar (handle);}STARTUPINFO lpStartUpInfo = Display.lpStartupInfo;if (lpStartUpInfo != null && (lpStartUpInfo.dwFlags & OS.STARTF_USESHOWWINDOW) != 0) {OS.ShowWindow (handle, lpStartUpInfo.wShowWindow);} else {OS.ShowWindow (handle, swFlags);}}if (isDisposed ()) return;opened = true;if (!moved) {moved = true;Point location = getLocation ();oldX = location.x;oldY = location.y;}if (!resized) {resized = true;Rectangle rect = getClientArea ();oldWidth = rect.width;oldHeight = rect.height;}/** Bug in Windows.  On Vista using the Classic theme, * when the window is hung and UpdateWindow() is called,* nothing is drawn, and outstanding WM_PAINTs are cleared.* This causes pixel corruption.  The fix is to avoid calling* update on hung windows.  */boolean update = true;if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION (6, 0) && !OS.IsAppThemed ()) {update = !OS.IsHungAppWindow (handle);}if (update) OS.UpdateWindow (handle);}} else {if (!OS.IsWinCE) {if (OS.IsIconic (handle)) {swFlags = OS.SW_SHOWMINNOACTIVE;} else {if (OS.IsZoomed (handle)) {swFlags = OS.SW_SHOWMAXIMIZED;} else {swFlags = OS.SW_SHOWNOACTIVATE;}}}if (!getDrawing()) {state |= HIDDEN;} else {OS.ShowWindow (handle, OS.SW_HIDE);}if (isDisposed ()) return;sendEvent (SWT.Hide);}}

?这个方法里面OS.ShowWindow和OS.UpdateWindow都有了。我是在OS类中的ShowWindow和UpdateWindow方法上加了断点，然后通过运行的上下文找到的~

如果去掉程序中的shell.open();这行代码，程序运行没问题，但是不会显示窗口。

到现在，一个windows程序中的注册、创建、显示、更新窗口，消息循环我们都在SWT程序中找到对应的代码了。还差一个窗口过程函数没找到。这个难度大一些，我力争分析出来，下次继续。

未完待续。

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SWT源码分析(4)