蘋果定義給 Safari 用的 Webkit Plug-in API 基本上就是一個 NSView，也就是，你自己弄一個 NSView 的 sub-class，然後丟進一個 Bundle 裡頭，然後告訴 Safari 在什麼狀況下應該要使用你的 Plugin，在用到的時候，Safari 就會在 WebView 上面透過 addSubview: 把你的 plug-in 裡頭的 view 弄上去。
因為是透過 addSubview: 加上去的，而 WebView 原本的內容呢，都是直接透過繪圖指令，繪製在 WebView 的 context 裡頭，所以，你的 plug-in 的畫面一定會疊在 WebView 所有的 web 內容的上面，而且不可能用什麼 css 把 HTML 裡頭的東西疊在 plug-in 上，因為 HTML 內容與 plug-in 裡頭的東西根本就不在同一個 view、同一個 context 裡。
寫了一篇老王賣瓜的 blog。
The lastest beta of Mac OS X 10.6 Snow Leopard uses Heiti TC (黑體-繁) system font for Traditional Chinese. Heiti TC is available on Leopard although the system font of Leopard is Lihei Pro. This font looks really bad, and the bad font could ruin Mac OS X’s user experience no matter how advance Snow Leopard is!
Comparing to the previous system fonts such as Lihei Pro and so on, the glyph of each character of Heiti TC is smaller and placed on a lower baseline.
It results, if you switch the locale of your Mac to Traditional Chinese, you may see the Chinese text is placed too low on the menu bar, the text is too close to the bottom of the menu bar and the space on the top is too large. It makes users feel bad since it lacks the aesthetic of balance.
Another problem is the Chinese comma (， Unicode U+FF0C). Unlike the Simplified Chinese, the Traditional Chinese punctuation marks should be placed on the vertical center but not on the baseline, but Heiti TC places it on the baseline. Therefore, when using such a font to create a document, people will find the document not well formatted and not professional.
Furthermore, the positions of Heiti TC’s punctuation marks are all not consistent. The Chinese Comma is placed on the baseline, and the Chinese Stop is placed on the vertical center. I do not know anyone who use this font although it is available on Leopard, the reason might be that any native Chinese speaker would consider this font is useful.
Apple, as a Mac user, I request you. If you cannot alter the ugly part of the font before the release of Snow Leopard, please keep using Lihei Pro. I can bear that Mac OS X has bugs, but I cannot bear a terrible font!
If you are a Chinese Mac user, and you know some guys working at Apple, please write to them to let them know this issue. Or, you can tell Apple by filing tickets on Open Radar or Apple Bug Reporter website.
Chinese version of the text:
