Question

我还没有找到在网络上使用Clojure REPL和Qt的解决方案。基本上问题是，只要您调用QApplication / exec以便显示UI，REPL就会挂起。你不能将C-c C-c重新放回到REPL中，关闭活动的Qt窗口似乎会杀死整个Clojure进程。

现在只能在代理中调用QApplication / processEvents，除非代理在您创建Qt小部件的完全相同的线程中运行。我花了两天时间来弄明白这一点，我看到其他人有同样的问题/问题，但没有解决方案。所以这是我的，代码：

(add-classpath "file:///usr/share/java/qtjambi.jar")
(ns qt4-demo
  (:import (com.trolltech.qt.gui QApplication QPushButton QFont QFont$Weight)
           (com.trolltech.qt.core QCoreApplication)
           (java.util Timer TimerTask)
           (java.util.concurrent ScheduledThreadPoolExecutor TimeUnit))
  (:require swank.core))

(defn init []
  (QApplication/initialize (make-array String 0)))

(def *gui-thread* (new java.util.concurrent.ScheduledThreadPoolExecutor 1))
(def *gui-update-task* nil)
(def *app* (ref nil))

(defn update-gui []
  (println "Updating GUI")
  (QApplication/processEvents))

(defn exec []
  (.remove *gui-thread* update-gui)
  (def *gui-update-task* (.scheduleAtFixedRate *gui-thread* update-gui 0 150 (. TimeUnit MILLISECONDS))))

(defn stop []
  (.remove *gui-thread* update-gui)
  (.cancel *gui-update-task*))

(defmacro qt4 [& rest]
  `(do
     (try (init) (catch RuntimeException e# (println e#)))
     ~@rest
     ))

(defmacro with-gui-thread [& body]
  `(.get (.schedule *gui-thread* (fn [] (do ~@body)) (long 0) (. TimeUnit MILLISECONDS))))

(defn hello-world []
  (with-gui-thread
    (qt4
     (let [app (QCoreApplication/instance)
           button (new QPushButton "Go Clojure Go")]
       (dosync (ref-set *app* app))
       (doto button
         (.resize 250 100)
         (.setFont (new QFont "Deja Vu Sans" 18 (.. QFont$Weight Bold value)))
         (.setWindowTitle "Go Clojure Go")
         (.show)))))
  (exec))

基本上它使用ScheduledThreadPoolExecutor类来执行所有Qt代码。您可以使用with-gui-thread宏来更容易地从线程内调用函数。这样就可以在不重新编译的情况下即时更改Qt UI。

Answer 1

如果您想要使用REPL中的Qt小部件，QApplication/invokeLater或QApplication/invokeAndWait可能就是您想要的。您可以将它们与代理结合使用。鉴于此：

(ns qt4-demo
  (:import (com.trolltech.qt.gui QApplication QPushButton)
           (com.trolltech.qt.core QCoreApplication)))

(def *app* (ref nil))
(def *button* (ref nil))
(def *runner* (agent nil))

(defn init [] (QApplication/initialize (make-array String 0)))
(defn exec [] (QApplication/exec))

(defn hello-world [a]
  (init)
  (let [app (QCoreApplication/instance)
        button (doto (QPushButton. "Go Clojure Go") (.show))]
    (dosync (ref-set *app* app)
            (ref-set *button* button)))
  (exec))

然后来自REPL：

qt4-demo=> (send-off *runner* hello-world)
#<Agent@38fff7: nil>

;; This fails because we are not in the Qt main thread
qt4-demo=> (.setText @*button* "foo")
QObject used from outside its own thread, object=QPushButton(0x8d0f55f0) , objectThread=Thread[pool-2-thread-1,5,main], currentThread=Thread[main,5,main] (NO_SOURCE_FILE:0)

;; This should work though
qt4-demo=> (QApplication/invokeLater #(.setText @*button* "foo"))
nil
qt4-demo=> (QApplication/invokeAndWait #(.setText @*button* "bar"))
nil

Answer 2

我已经写过关于如何使用SLIME on my blog（德语）以及on the Clojure mailing-list执行此操作。诀窍是在Emacs端定义适当的功能，并告诉SLIME在发出请求时使用它们。重要的是，这使您无需在调用Qt代码时进行特殊的咒语。

引用自己：

鉴于我们在这里谈论Lisp，   无论如何，解决方案似乎是   显而易见：Hack SLIME！这就是我   没有。删除后的代码如下   进入你的.emacs（在某一点上   SLIME已经满载了，   注册三个新的Emacs-Lisp   交互式使用的功能。您   可以将它们绑定到你的任何键   喜欢，或者你甚至可以设置   煤泥送阅的QApplication   申请后变量为t   已经开始而不用担心关键   绑定。要么应该做   你的REPL提交和C-M-x风格   间接互动评估   通过QCoreApplication / invokeAndWait。

玩得开心！

(defvar slime-send-through-qapplication nil) 
(defvar slime-repl-send-string-fn (symbol-function 'slime-repl-send- 
string)) 
(defvar slime-interactive-eval-fn (symbol-function 'slime-interactive- 
eval)) 

(defun qt-appify-form (form) 
  (concatenate 'string    ;'
               "(let [return-ref (ref nil)] " 
               "  (com.trolltech.qt.core.QCoreApplication/invokeAndWait " 
               "   (fn [] " 
               "     (let [return-value (do " 
               form 
               "          )] " 
               "       (dosync (ref-set return-ref return-value))))) " 
               "  (deref return-ref))")) 

(defun slime-interactive-eval (string) 
  (let ((string (if slime-send-through-qapplication 
                    (qt-appify-form string) 
                    string))) 
    (funcall slime-interactive-eval-fn string))) 

(defun slime-repl-send-string (string &optional command-string) 
  (let ((string (if slime-send-through-qapplication 
                    (qt-appify-form string) 
                    string))) 
    (funcall slime-repl-send-string-fn string command-string))) 

(defun slime-eval-defun-for-qt () 
  (interactive) 
  (let ((slime-send-through-qapplication t)) 
    (slime-eval-defun))) 

(defun slime-repl-closing-return-for-qt () 
  (interactive) 
  (let ((slime-send-through-qapplication t)) 
    (slime-repl-closing-return))) 

(defun slime-repl-return-for-qt (&optional end-of-input) 
  (interactive) 
  (let ((slime-send-through-qapplication t)) 
    (slime-repl-return end-of-input)))

如何与Qt Jambi一起使用Clojure REPL？

2 个答案: