Ubuntu 系统下 Sublime Text 2/3 不能输入中文的解决方法

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解决 Sublime Text 2/3 不能输入中文问题的方法如下：

1.新建 sublime-imfix.c 文件

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cd /opt/sublime_text
touch sublime-imfix.c
sudo gedit sublime_imfix.c

2.粘贴以下内容并保存

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/*
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); 
}

3.编译成共享库

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sudo apt-get install build-essential libgtk2.0-dev
sudo gcc -shared -o libsublime-imfix.so sublime_imfix.c  `pkg-config --libs --cflags gtk+-2.0` -fPIC

4.运行

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LD_PRELOAD=./libsublime-imfix.so sublime_text

5.这样仅仅支持从终端启动 Sublime Text 才能正常输入中文，要想快捷方式也支持，还得编辑快捷方式

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sudo gedit /usr/share/applications/sublime-text.desktop

6.修改后的内容如下

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[Desktop Entry]
Version=1.0
Type=Application
Name=Sublime Text
StartupWMClass=Sublime_text
Comment=Sophisticated text editor for code, markup and prose
Exec=bash -c 'LD_PRELOAD=/usr/lib/libsublime-imfix.so /opt/sublime_text/    sublime_text %F'
Terminal=false
Type=Application
MimeType=text/plain;
Icon=/opt/sublime_text/Icon/logo-sublime-3.png
Categories=TextEditor;Development;Utility;
StartupNotify=true
Actions=Window;Document;

X-Desktop-File-Install-Version=0.22

[Desktop Action Window]
Name=New Window
Exec=bash -c 'LD_PRELOAD=/usr/lib/libsublime-imfix.so /opt/sublime_text/sublime_text -n'
OnlyShowIn=Unity;

[Desktop Action Document]
Name=New File
Exec=bash -c 'LD_PRELOAD=/usr/lib/libsublime-imfix.so /opt/sublime_text/sublime_text --command new_file'
OnlyShowIn=Unity;

原理：

通过 LD_PRELOAD 实现了 gtk_im_context_set_client_window 的加载, 使得输入法能够获得焦点

参考资料：

（完）