Qt(通过公共Lisp';的qtools):QLineEdit不会在单击时激活,而是在选项卡上接收焦点 问题
我遇到了一个相当奇怪的问题:Qt(通过公共Lisp';的qtools):QLineEdit不会在单击时激活,而是在选项卡上接收焦点 问题,qt,widget,common-lisp,sbcl,ubuntu-16.04,Qt,Widget,Common Lisp,Sbcl,Ubuntu 16.04,我遇到了一个相当奇怪的问题:QLineEdit界面中的对象无法通过鼠标单击来访问,但使用选项卡,它们接收焦点并响应键盘输入。但即使他们有焦点,他们也不会对点击做出反应。更奇怪的是,最后添加的QLineEdit确实会对点击做出响应 额外的问题:鼠标无法访问的线编辑不会显示工具提示 我正在使用CommonLisp构建接口,所以我必须解释一下它是如何工作的。简而言之,我在循环中一个接一个地添加行编辑,所有行编辑都以相同的方式创建并添加到QGridLayout 已更新:有关问题的可能来源,请参见下文 参
QLineEdit
界面中的对象无法通过鼠标单击来访问,但使用选项卡
,它们接收焦点并响应键盘输入。但即使他们有焦点,他们也不会对点击做出反应。更奇怪的是,最后添加的QLineEdit
确实会对点击做出响应
额外的问题:鼠标无法访问的线编辑不会显示工具提示
我正在使用CommonLisp构建接口,所以我必须解释一下它是如何工作的。简而言之,我在循环中一个接一个地添加行编辑,所有行编辑都以相同的方式创建并添加到QGridLayout
已更新:有关问题的可能来源,请参见下文
参数小部件
参数小部件用于表示一个参数输入。每个参数都有名称、值和度量单位。名称和单位显示为标签,该值可编辑,由QLineEdit
(define-widget parameter-widget (QWidget)
((parameter :initarg :parameter)))
(define-subwidget (parameter-widget label) (q+:make-qlabel parameter-widget)
(setf (q+:text label) (parameter-base-name parameter)))
(define-subwidget (parameter-widget entry) (q+:make-qlineedit parameter-widget)
(setf (q+:alignment entry) +align-right+)
(setf (q+:text entry) (format nil "~A" (parameter-value parameter)))
(setf (q+:tool-tip entry) (parameter-base-description parameter)))
(define-subwidget (parameter-widget units) (q+:make-qlabel parameter-widget)
(setf (q+:text units) (parameter-units parameter)))
为指示参数值已更改,参数小部件
将显示新信号参数已更改
(对于Qt,它被转换为信号“parameterChanged”):
行编辑的插槽尝试将文本转换为数字,如果成功,则更新基础参数并发出参数更改
:
(define-slot (parameter-widget parameter-changed) ((new-text string))
(declare (connected entry (text-changed string)))
(handler-case
(let ((new-number (parse-number new-text)))
(setf (parameter-value parameter) new-number)
(signal! parameter-widget (parameter-changed)))
(error nil)))
此方法仅用于自动为参数
类型的对象构造小部件(工厂方法):
此方法用于对齐参数容器中多个单个参数的标签(请参阅下文):
参数容器
因此,如果我单独使用参数小部件
,一切都正常。但大多数情况下,我需要以参数容器
的形式提供多个参数:
(define-widget parameter-container-widget (QWidget)
((parameter-container :initarg :parameter-container)))
(defmethod add-to-grid ((widget parameter-container-widget) grid row column)
(q+:add-widget grid widget row column 1 1))
此插槽从所有子参数
捕获信号参数已更改
,并为容器重新发送该信号
(define-slot (parameter-container-widget parameter-changed) ()
(format t "~&Re-emitting the signal...~%")
(signal! parameter-container-widget (parameter-changed)))
layout
是QGridLayout
用于为所有parameter
-参数容器的子对象放置所有单个参数小部件
。它所做的一切:
- 它在所有单个参数上循环
- 为每个组件构造
参数小部件
- 逐行添加到布局中
- 并将信号<代码>参数更改<代码>连接到上述定义的插槽
代码:
此方法用于统一处理参数小部件
和参数容器
:
(define-widget parameter-container-widget (QWidget)
((parameter-container :initarg :parameter-container)))
(defmethod add-to-grid ((widget parameter-container-widget) grid row column)
(q+:add-widget grid widget row column 1 1))
和泛型实例化器(工厂方法):
系统信息
Qt4.8,通用Lisp:SBCL 1.3.7,来自Quicklisp的qtools,操作系统:Ubuntu 16.04
更新
Windows 10上也存在同样的问题
更新2:完整的最小示例
我很抱歉,上面的代码使用了其他包中的许多定义:全部放进去会让它变得很长。最小的例子可以归结为:
(ql:quickload '(:qtools :qtcore :qtgui))
(defpackage :qtexample
(:use #:cl+qt))
(in-package qtexample)
(in-readtable :qtools)
(defclass parameter ()
((name :initarg :name :accessor parameter-name)
(value :initarg :value :accessor parameter-value)
(units :initarg :units :accessor parameter-units)))
(defun parameter (name value units)
(make-instance 'parameter
:name name
:value value
:units units))
(defvar *mass* (parameter "mass" 1d0 "kg"))
(defvar *velocity* (parameter "velocity" 0.5d0 "m/s"))
(defvar *temperature* (parameter "temperature" 300d0 "K"))
(defvar *pressure* (parameter "pressure" 1d5 "Pa"))
(define-widget parameter-widget (QWidget)
((parameter
:initarg :parameter
:accessor parameter-widget-parameter)))
(define-subwidget (parameter-widget label)
(q+:make-qlabel parameter-widget)
(setf (q+:text label) (parameter-name parameter)))
(defmethod make-ui ((object parameter))
(make-instance 'parameter-widget :parameter object))
(defconstant +align-right+ 2)
(define-subwidget (parameter-widget entry)
(q+:make-qlineedit parameter-widget)
(setf (q+:alignment entry) +align-right+)
(setf (q+:text entry) (format nil "~A" (parameter-value parameter))))
(define-subwidget (parameter-widget units)
(q+:make-qlabel parameter-widget)
(setf (q+:text units) (parameter-units parameter)))
(define-signal (parameter-widget parameter-changed) ())
(define-slot (parameter-widget entry) ((new-text string))
(declare (connected entry (text-changed string)))
(format t "~&Parameter has changed~%")
(handler-case
(let ((new-number (parse-number:parse-number new-text)))
(setf (parameter-value parameter) new-number)
(signal! parameter-widget (parameter-changed)))
(error nil)))
(defmethod add-to-grid ((widget parameter-widget) grid row column)
(with-slots (label entry units) widget
(q+:add-widget grid label row column 1 1)
(q+:add-widget grid entry row (1+ column) 1 1)
(q+:add-widget grid units row (+ column 2) 1 1)
(list (1+ row) (+ column 3))))
(define-widget parameter-widget-window (QWidget)
((parameter :initarg :parameter)))
(define-subwidget (parameter-widget-window parameter-widget)
(make-ui parameter))
(define-subwidget (parameter-widget-window grid)
(q+:make-qgridlayout parameter-widget-window)
(add-to-grid parameter-widget grid 0 0))
(defun parameter-example (parameter)
(with-main-window
(window (make-instance 'parameter-widget-window
:parameter parameter))))
(define-widget parameter-container-widget (QWidget)
((parameter-container
:initarg :parameter-container
:accessor parameter-container-widget-parameter-container)))
(defmethod make-ui ((object list))
(make-instance 'parameter-container-widget :parameter-container object))
(define-slot (parameter-container-widget parameter-changed) ()
(format t "~&Re-emitting the signal...~%")
(signal! parameter-container-widget (parameter-changed)))
(define-subwidget (parameter-container-widget layout)
(q+:make-qgridlayout parameter-container-widget)
(let* ((parameter-widgets (loop for p in parameter-container
collect (make-ui p))))
(loop for p in parameter-widgets
for row from 0
do (progn
(setf (q+:parent p) parameter-container-widget)
(add-to-grid p layout row 0)
(connect! p
(parameter-changed)
parameter-container-widget
(parameter-changed))))))
(define-widget parameter-container-widget-window (QWidget)
((parameter-container :initarg :parameter-container)))
(define-subwidget (parameter-container-widget-window container-widget)
(make-ui parameter-container)
(setf (q+:parent container-widget) parameter-container-widget-window))
(define-slot (parameter-container-widget-window parameter-changed) ()
(declare (connected container-widget (parameter-changed)))
(format t "~&Got parameter changed~%"))
(defmethod add-to-grid ((widget parameter-container-widget) grid row column)
(q+:add-widget grid widget row column))
(defun example-parameter-container (parameter-container)
(with-main-window
(window (make-instance 'parameter-container-widget-window
:parameter-container parameter-container))))
;; to run:
(example-parameter-container (list *mass* *velocity*))
在研究过程中,我偶然发现了一个可能的解决方案。这条线
(setf (q+:parent p) parameter-container-widget)
将子小部件p
(在子小部件列表中)的父级设置为参数容器小部件
。如果这一行被注释,一切正常
p
的子窗口小部件(包括entry
,一个QLineEdit
的实例)稍后会添加到网格中,而不是p
本身!在某种程度上,参数小部件
不是一个合适的小部件:它只是一个其他小部件的集合,具有如何将它们添加到容器中的规则。但从某种意义上说,它需要充当小部件,能够接收和发送信号。在@KubaOber和@Shinmera提出建议后,我设法解决了这个问题。我在这里发布修复程序,供将来参考
准备工作没有改变(除了,我忘了添加:PARSE-NUMBER
系统):
由于PARAMETER-WIDGET
实际上不是一个WIDGET,而是其他WIDGET的容器(它本身不能添加到一个合适的WIDGET容器中-否则标签的对齐会中断-请参见ADD-TO-GRID
方法),但它需要能够接收和发送信号,它继承自QObject
,而不是QWidget
。所有子部件现在都只是其中的普通类插槽,而不是由(DEFINE-SUBWIDGET…
定义。注意,没有为任何子小部件提供父部件:当这些小部件添加到容器小部件时,将分配parent属性
(define-widget parameter-widget (QObject)
((parameter
:initarg :parameter
:accessor parameter-widget-parameter)
(label :initform (q+:make-qlabel))
(entry :initform (q+:make-qlineedit))
(units :initform (q+:make-qlabel))))
初始化进入INITIALIZE-INSTANCE:AFTER
方法:
(defconstant +align-right+ 2)
(defmethod initialize-instance :after ((object parameter-widget) &key)
(with-slots (parameter label entry units) object
(setf (q+:text label) (parameter-name parameter))
(setf (q+:text entry) (format nil "~A" (parameter-value parameter)))
(setf (q+:alignment entry) +align-right+)
(setf (q+:text units) (parameter-units parameter))))
定义的其余部分保持不变(信号与问题基本无关,但有助于理解我为什么要跳过所有这些障碍):
这是一个简单的演示,所有的东西都只适用于一个参数。现在,PARAMETER-WIDGET
不再是一个小部件,因此它被添加为一个类槽
(define-widget parameter-widget-window (QWidget)
((parameter :initarg :parameter)
(parameter-widget)))
窗口的网格:
(define-subwidget (parameter-widget-window grid)
(q+:make-qgridlayout parameter-widget-window))
此处,将PARAMETER-WIDGET
组件添加到网格中的内容从该定义中移除。原因:此时插槽PARAMETER-WIDGET
未绑定。它在INITIALIZE-INSTANCE:AFTER
方法中绑定,其中所有组件都添加到网格中:
(defmethod initialize-instance :after ((object parameter-widget-window) &key)
(with-slots (parameter parameter-widget grid) object
(setf parameter-widget (make-ui parameter))
(setf (q+:parent parameter-widget) object)
(add-to-grid parameter-widget grid 0 0)))
发射器保持不变:
(defun parameter-example (parameter)
(with-main-window
(window (make-instance 'parameter-widget-window
:parameter parameter))))
要运行:(参数示例*mass*)
PARAMETER-CONTAINER-WIDGET
是一个合适的小部件。它的定义没有改变:
(define-widget parameter-container-widget (QWidget)
((parameter-container
:initarg :parameter-container
:accessor parameter-container-widget-parameter-container)))
(defmethod make-ui ((object list))
(make-instance 'parameter-container-widget :parameter-container object))
(define-slot (parameter-container-widget parameter-changed) ()
(format t "~&Re-emitting the signal...~%")
(signal! parameter-container-widget (parameter-changed)))
(define-widget parameter-container-widget-window (QWidget)
((parameter-container :initarg :parameter-container)))
(define-subwidget (parameter-container-widget-window container-widget)
(make-ui parameter-container)
(setf (q+:parent container-widget) parameter-container-widget-window))
(define-slot (parameter-container-widget-window parameter-changed) ()
(declare (connected container-widget (parameter-changed)))
(format t "~&Got parameter changed~%"))
(defun example-parameter-container (parameter-container)
(with-main-window
(window (make-instance 'parameter-container-widget-window
:parameter-container parameter-container))))
布局
定义也不会改变。但是现在可以安全地将p
(PARAMETER-WIDGET
)的父属性设置为PARAMETER-WIDGET-CONTAINER
,因此当容器被销毁时,它会被销毁
(define-subwidget (parameter-container-widget layout)
(q+:make-qgridlayout parameter-container-widget)
(let* ((parameter-widgets (loop for p in parameter-container
collect (make-ui p))))
(loop for p in parameter-widgets
for row from 0
do (progn
(add-to-grid p layout row 0)
(let ((pp p))
(setf (q+:parent pp) parameter-container-widget))
(connect! p
(parameter-changed)
parameter-container-widget
(parameter-changed))))))
将此小部件添加到网格很简单(但不完全正确,但可以修复,请参阅下文):
演示部分没有更改:
(define-widget parameter-container-widget (QWidget)
((parameter-container
:initarg :parameter-container
:accessor parameter-container-widget-parameter-container)))
(defmethod make-ui ((object list))
(make-instance 'parameter-container-widget :parameter-container object))
(define-slot (parameter-container-widget parameter-changed) ()
(format t "~&Re-emitting the signal...~%")
(signal! parameter-container-widget (parameter-changed)))
(define-widget parameter-container-widget-window (QWidget)
((parameter-container :initarg :parameter-container)))
(define-subwidget (parameter-container-widget-window container-widget)
(make-ui parameter-container)
(setf (q+:parent container-widget) parameter-container-widget-window))
(define-slot (parameter-container-widget-window parameter-changed) ()
(declare (connected container-widget (parameter-changed)))
(format t "~&Got parameter changed~%"))
(defun example-parameter-container (parameter-container)
(with-main-window
(window (make-instance 'parameter-container-widget-window
:parameter-container parameter-container))))
运行:(define-widget parameter-container-widget (QWidget)
((parameter-container
:initarg :parameter-container
:accessor parameter-container-widget-parameter-container)))
(defmethod make-ui ((object list))
(make-instance 'parameter-container-widget :parameter-container object))
(define-slot (parameter-container-widget parameter-changed) ()
(format t "~&Re-emitting the signal...~%")
(signal! parameter-container-widget (parameter-changed)))
(define-subwidget (parameter-container-widget layout)
(q+:make-qgridlayout parameter-container-widget)
(let* ((parameter-widgets (loop for p in parameter-container
collect (make-ui p))))
(loop for p in parameter-widgets
for row from 0
do (progn
(add-to-grid p layout row 0)
(let ((pp p))
(setf (q+:parent pp) parameter-container-widget))
(connect! p
(parameter-changed)
parameter-container-widget
(parameter-changed))))))
(defmethod add-to-grid ((widget parameter-container-widget) grid row column)
(q+:add-widget grid widget row column))
(define-widget parameter-container-widget-window (QWidget)
((parameter-container :initarg :parameter-container)))
(define-subwidget (parameter-container-widget-window container-widget)
(make-ui parameter-container)
(setf (q+:parent container-widget) parameter-container-widget-window))
(define-slot (parameter-container-widget-window parameter-changed) ()
(declare (connected container-widget (parameter-changed)))
(format t "~&Got parameter changed~%"))
(defun example-parameter-container (parameter-container)
(with-main-window
(window (make-instance 'parameter-container-widget-window
:parameter-container parameter-container))))
(example-parameter-container (list *mass* *velocity* (list *temperature* *pressure*)))