解决SublimeText3在ubuntu下中文输入的问题

　　在ubuntu下使用ST这神器已经一段日子了，但是一直有个纠结的问题，就是中文输入非常坑爹，曾经一段时间，使用inputHelper这个插件来解决，

但是……每次都要按个快捷键，弹出一个小小小框来输入中文，能这样欺负人吗？在无数次翻阅前辈的博客之后……一如既往的坑爹，因为太多都是copy，

很多残缺，或者我的亲ubuntu14.04一点反应都没有，于是，一次偶然的机会，才发现sublime text自己就有个论坛……这就是浮躁的年轻人，咋就不会

看看脚下呢……马上来记录一下今天的解决方案：

　　1. 首先找到ST的安装目录，我的是/opt/sublime_text/，创建一个sublime-imfix.c的文件，由于网上各种的压缩代码非常坑爹，就不压缩了，代码如下：

/*
sublime-imfix.c
Use LD_PRELOAD to interpose some function to fix sublime input method support for linux.
By Cjacker Huang <jianzhong.huang at i-soft.com.cn>

gcc -shared -o libsublime-imfix.so sublime_imfix.c  `pkg-config --libs --cflags gtk+-2.0` -fPIC
LD_PRELOAD=./libsublime-imfix.so sublime_text
*/
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
typedef GdkSegment GdkRegionBox;

struct _GdkRegion
{
  long size;
  long numRects;
  GdkRegionBox *rects;
  GdkRegionBox extents;
};

GtkIMContext *local_context;

void
gdk_region_get_clipbox (const GdkRegion *region,
            GdkRectangle    *rectangle)
{
  g_return_if_fail (region != NULL);
  g_return_if_fail (rectangle != NULL);

  rectangle->x = region->extents.x1;
  rectangle->y = region->extents.y1;
  rectangle->width = region->extents.x2 - region->extents.x1;
  rectangle->height = region->extents.y2 - region->extents.y1;
  GdkRectangle rect;
  rect.x = rectangle->x;
  rect.y = rectangle->y;
  rect.width = 0;
  rect.height = rectangle->height; 
  //The caret width is 2; 
  //Maybe sometimes we will make a mistake, but for most of the time, it should be the caret.
  if(rectangle->width == 2 && GTK_IS_IM_CONTEXT(local_context)) {
        gtk_im_context_set_cursor_location(local_context, rectangle);
  }
}

//this is needed, for example, if you input something in file dialog and return back the edit area
//context will lost, so here we set it again.

static GdkFilterReturn event_filter (GdkXEvent *xevent, GdkEvent *event, gpointer im_context)
{
    XEvent *xev = (XEvent *)xevent;
    if(xev->type == KeyRelease && GTK_IS_IM_CONTEXT(im_context)) {
       GdkWindow * win = g_object_get_data(G_OBJECT(im_context),"window");
       if(GDK_IS_WINDOW(win))
         gtk_im_context_set_client_window(im_context, win);
    }
    return GDK_FILTER_CONTINUE;
}

void gtk_im_context_set_client_window (GtkIMContext *context,
          GdkWindow    *window)
{
  GtkIMContextClass *klass;
  g_return_if_fail (GTK_IS_IM_CONTEXT (context));
  klass = GTK_IM_CONTEXT_GET_CLASS (context);
  if (klass->set_client_window)
    klass->set_client_window (context, window);

  if(!GDK_IS_WINDOW (window))
    return;
  g_object_set_data(G_OBJECT(context),"window",window);
  int width = gdk_window_get_width(window);
  int height = gdk_window_get_height(window);
  if(width != 0 && height !=0) {
    gtk_im_context_focus_in(context);
    local_context = context;
  }
  gdk_window_add_filter (window, event_filter, context); 
}

　　2. 安装C/C++的编译环境和gtk libgtk2.0-dev 命令如下：

　　sudo apt-get install build-essential  
　　sudo apt-get install libgtk2.0-dev
　　sudo apt-get install gtk+-2.0

　　3. 编译成共享库

　　gcc -shared -o libsublime-imfix.so sublime-imfix.c  `pkg-config --libs --cflags gtk+-2.0` -fPIC

　　4. 命令行启动sublime，检测一下能否输入中文：

　　LD_PRELOAD=./libsublime-imfix.so subl //我的sublime是deb安装的，所以命令行可用subl

　　5. 接下来我们还要通过修改sublime-text-2.desktop达到点击图标启动。　

　　mv libsublime-imfix.so /usr/lib

　　cd /usr/share/applications

　　sudo gedit sublime_text.desktop

　　打开sublime_text.desktop后，修改如下

　　将Exec=/opt/sublime_text/sublime_text %F　　修改为　　Exec=bash -c 'LD_PRELOAD=/usr/lib/libsublime-imfix.so /opt/sublime_text/sublime_text' %F

　　将Exec=/opt/sublime_text/sublime_text -n　　修改为　　Exec=bash -c 'LD_PRELOAD=/usr/lib/libsublime-imfix.so /opt/sublime_text/sublime_text' -n 

　　完成，即可，当然我的用是fcitx输入法框架，ibus的就……一脸的泪，其实有点感觉，方便即可……实在不行就用win系统也是不错的选择。