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<p><FONT class=normalfont><B><font color=blue>SWT（implemented with gtk）的可视化控件的X11窗口句柄</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：sakulagi<br>来自：Linux知识宝库<br>联系方式：无名<br><br>SWT与AWT本质上都是一套依赖于操作系统具体实现的GUI库。与swing在所有操作系统上外观一致的做法不同，awt和swt在不同的操作系统上的外观是和本地窗口一样的。<br>
每一个swt和awt的窗口都对应一个本地窗口（native window），自然也会有一个窗口句柄。而swing则不同，是没有本地窗口句柄的。在获得窗口句柄之后，就可以和用其他的语言（比如C++）实现的 GUI应用程序进行一些互操作。比如我们可以调用一些SetParene()之类的方法把一个本地的窗口嵌入到一个SWT的窗口里来，反之亦然。这样就提供了一个创建更丰富美观的，可扩充性更强的GUI应用程序的手段。<br>
<br>
关于AWT的窗口句柄如何获得，就不多说了。大家可以参考一下你的jdk的安装目录的include子目录，可以看到里面有一个jawt.h，里面有一个很容易看懂的得到系统的window handle的sample. 我是用的linux上的SUN j2sdk 1.4,在include/linux子目录里还可以看到jawt_md.h.里面定义了一个struct：<br>
代码:<br>
<br>
typedef struct jawt_X11DrawingSurfaceInfo {<br>
Drawable drawable;<br>
Display* display;<br>
VisualID visualID;<br>
Colormap colormapID;<br>
int depth;<br>
/*<br>
* Since 1.4<br>
* Returns a pixel value from a set of RGB values.<br>
* This is useful for paletted color (256 color) modes.<br>
*/<br>
int (JNICALL *GetAWTColor)(JAWT_DrawingSurface* ds,<br>
int r, int g, int b);<br>
} JAWT_X11DrawingSurfaceInfo;<br>
<br>
<br>
drawable这个成员其实就是X11的Resource ID.在jawt.h的那个sample中，只要把dsi->platforminfo转换成 jawt_X11DrawingSurfaceInfo类型，就可以得到X11的resource ID了，是不是很容易呢。<br>
<br>
至于SWT，所有控件和窗口的父类org.eclipse.swt.widgets.Control有一个成员变量handle.按照SWT的官方API 的说法：the handle to the OS resource (Warning: This field is platform dependent) 。如果是Win32平台上，那么这个handle其实就是Win32 API里的那个最常见的HWND。如果用spy++的话可以很容易看到。在linux上就不是这样了。——终于说到正题了看来我还真是能拖戏啊……, hoho ^O^ ）。<br>
<br>
由于在Linux上，swt是基于不同的本地窗口风格来构建自己的窗口的，所以就有了Motif版的和gtk版的SWT。不知道会不会有QT版的，呵呵。我是用的gtk版本的SWT，所以org.ecllipse.swt.widgets.Control的成员handle并不是X11的resource ID，通过察看swt的source code发现，这个handle其实是一个GtkWidget*类型的变量。OK,我们就可以通过类似这样一段代码来得到X11的resource ID:<br>
代码:<br>
<br>
JNIEXPORT jlogn JNICALL Java_.......getX11Handle(JNIEnv* env, jobject obj_this, jlong swt_handle)<br>
{<br>
GtkWidget* pWidget = (GtkWidget*)((int)swt_handle);<br>
GdkWindow* pWindow = pWidget->window;<br>
int x11id = GDK_WINDOW_XWINDOW(pWindow);<br>
}<br>
<br>
<br>
这样我们就得到了这个swt控件的X11 ID了。<br>
<br>
<br>
（为了在linux也能查看当前所有的可视窗口的Handle，我写了一小段程序，用树形结构来显示当前已经map了的window的id.我会尽快放到我的主页上）<br>
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