GNOME和KDE桌面环境之间的视觉差异很容易看出，那么如何能够在一个应用程序下运行另一个应用程序而不出问题呢？今天的超级用户问答帖子给出了答案。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

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问题

超级用户读者LeNoob想知道KDE应用程序如何在GNOME下运行：

If GNOME uses GTK+ and KDE uses Qt, how are KDE applicati*** able to run under GNOME?

是什么使KDE应用程序能够在GNOME下平稳运行？

答案

超级用户贡献者grawity为我们提供了答案：

This is possible because these desktop environments use the same graphics system, X11. All graphical programs only talk the X11 protocol with an X server (usually Xorg), sending commands to draw this or that, and receiving input events (mouse, keyboard, etc.).

Each UI toolkit like GTK or Qt comes in the form of libraries that the graphical program links against. A program written for GNOME will use libgdk and libgtk, and a KDE program will use libQtCore with libQtGui. Both toolkits then simply use the same X11 functi*** to draw everything in the respective program’s window.

Most modern toolkits, like GTK, Qt, or EFL, perform all drawing themselves, and just send the finished image of the whole window over X11. Older toolkits like Xaw or Motif instead send commands to draw primitives like lines or rectangles, and the X server does all rendering.

The X11 protocol also covers window management, so each desktop environment will have a “window manager” program which draws window frames (“decorati***”), allows you to move and resize windows, and so on. Modern “compositing” window managers actually take over Xorg’s job of composing all windows onto the final screen image, allowing things like shadows or effects to be added.

为了简单的“兼容性”而绑定到同一个图形系统是一件很棒的事情，当你想在同一个桌面环境下运行所有你喜欢的应用程序时，这是一件很棒的事情！

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