首页 \ 问答 \ 使用信号和插槽在Qt中与MainWindow通信QDialog(Using Signals and Slots to Comunicate a QDialog with MainWindow in Qt)

使用信号和插槽在Qt中与MainWindow通信QDialog(Using Signals and Slots to Comunicate a QDialog with MainWindow in Qt)

 好的，我认为是时候得到一些帮助，我一直在练习Qt的信号和插槽，我得到了库存。 我想要的是能够在单击QDialog中的按钮时更改主窗口中的标签。 我一直在寻找，显然唯一的方法是基本上使用信号和插槽，这是我的... 
 

 我有一个mainwindow.ui，带有一个名为“pushButton_OpenWindow”的按钮和一个QLabel label_ShowText“，我还有一个包含名为lineEdit_ExternalInput的QLineEdit的externaldialog.ui”和一个名为“pushButton_SendText”的QPushButton，我想要的是更改“label_ShowText” “无论什么价值”lineEdit_ExternalInput“当点击pushButton_SendText”但它不起作用时，当我点击按钮时没有任何错误发生，没有任何警告。 
 

 这是不起作用的代码...... 
 

 mainwindow.h 
 

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_OpenWindow_clicked();
    void textValue(const QString &newText);

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

 

 mainwindow.cpp 
 

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "externaldialog.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    ExternalDialog *externalDialog = new ExternalDialog;
    // connecting signals and slots
    QObject::connect(externalDialog, SIGNAL(textChanged(QString)), this, SLOT(textValue(QString)));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_OpenWindow_clicked()
{
    ExternalDialog mDialog;
    mDialog.setModal(true);
    mDialog.exec();
}

void MainWindow::textValue(const QString &newText)
{
    ui->label_ShowText->setText(newText);
    qDebug()<<"Message from textValue Function \n";
}

 

 externaldialog.h 
 

#ifndef EXTERNALDIALOG_H
#define EXTERNALDIALOG_H

#include <QDialog>

namespace Ui {
class ExternalDialog;
}

class ExternalDialog : public QDialog
{
    Q_OBJECT

public:
    explicit ExternalDialog(QWidget *parent = 0);
    ~ExternalDialog();

private:
    Ui::ExternalDialog *ui;

signals:
     void textChanged(const QString&);
public slots:
     void on_pushButton_SendText_clicked();
};

#endif // EXTERNALDIALOG_H

 

 externaldialog.cpp 
 

#include "externaldialog.h"
#include "ui_externaldialog.h"
#include <QDebug>


ExternalDialog::ExternalDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::ExternalDialog)
{
    ui->setupUi(this);

}

ExternalDialog::~ExternalDialog()
{
    delete ui;
}


void ExternalDialog::on_pushButton_SendText_clicked()
{
    emit textChanged(ui->lineEdit_ExternalInput->text());
    qDebug()<<"Sent Message";
}

 

 main.cpp中 
 

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

 

 知道我做错了什么吗？ 任何建议将不胜感激。 对不起，我发布了整个代码，但有时最好看到整个图片。 
 

 非常感谢 

Ok I think is time to get some help, I have been practicing with signals and slots in Qt and I got stocked. What I want is to be able to change a label in mainwindow when a button in a QDialog is clicked. I have been searching and apparently the only way to do this is basically using signals and slots, here is what I have...
 

I have a mainwindow.ui with a button called "pushButton_OpenWindow" and a QLabel label_ShowText", I also have a externaldialog.ui that contains a QLineEdit called lineEdit_ExternalInput" and a QPushButton called "pushButton_SendText", and what I want is to change "label_ShowText" to whatever value "lineEdit_ExternalInput" is when pushButton_SendText" is clicked but it doesn't work, when I click the button nothing happens no errors, no warnings nothing.
 

Here is the code that doesn't work...
 

mainwindow.h
 

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_OpenWindow_clicked();
    void textValue(const QString &newText);

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

 

mainwindow.cpp
 

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "externaldialog.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    ExternalDialog *externalDialog = new ExternalDialog;
    // connecting signals and slots
    QObject::connect(externalDialog, SIGNAL(textChanged(QString)), this, SLOT(textValue(QString)));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_OpenWindow_clicked()
{
    ExternalDialog mDialog;
    mDialog.setModal(true);
    mDialog.exec();
}

void MainWindow::textValue(const QString &newText)
{
    ui->label_ShowText->setText(newText);
    qDebug()<<"Message from textValue Function \n";
}

 

externaldialog.h
 

#ifndef EXTERNALDIALOG_H
#define EXTERNALDIALOG_H

#include <QDialog>

namespace Ui {
class ExternalDialog;
}

class ExternalDialog : public QDialog
{
    Q_OBJECT

public:
    explicit ExternalDialog(QWidget *parent = 0);
    ~ExternalDialog();

private:
    Ui::ExternalDialog *ui;

signals:
     void textChanged(const QString&);
public slots:
     void on_pushButton_SendText_clicked();
};

#endif // EXTERNALDIALOG_H

 

externaldialog.cpp
 

#include "externaldialog.h"
#include "ui_externaldialog.h"
#include <QDebug>


ExternalDialog::ExternalDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::ExternalDialog)
{
    ui->setupUi(this);

}

ExternalDialog::~ExternalDialog()
{
    delete ui;
}


void ExternalDialog::on_pushButton_SendText_clicked()
{
    emit textChanged(ui->lineEdit_ExternalInput->text());
    qDebug()<<"Sent Message";
}

 

main.cpp
 

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

 

Any idea what I'm I doing wrong? Any suggestion will be appreciated. Sorry I posted the whole code but sometimes is better to see the whole picture.
 

Thanks a lot

原文：
更新时间：2022-09-15 07:09

最满意答案

 好吧，似乎我将成为第一个为自己的问题找到答案的人:) 
 

 （1）首先， http：//www.muitovar.com/gtk2hs/chap7-2.html上的示例对我不起作用，因为你在gtk2hs中有两个eventButton函数，你必须使用Graphics.UI.Gtk.Gdk.Events的一个Graphics.UI.Gtk.Gdk.Events 。 所以你必须在文件的开头添加： 
 

import Graphics.UI.Gtk.Gdk.Events as Ev

 

 然后添加Ev. eventButton ， RightButton和eventSent前缀。 它现在会工作:) 
 

 （2）如何响应treeView行的右键单击： 
 

 解决了上述问题后，我偶然发现了这个例子，其中显示了如何响应在treeView中选择行。 所以我混合了这两个解决方案，并提出了类似的东西（大多数代码来自treeview示例，我的一些调整）： 
 

module Main where

 {- an example how to select from a list
   not satisfactory yet:
       - there should be a simpler way to render a simple list
       - i could not convert the model i got back to a list 
           from which to get the value

       - the interface offers a great number of functions 
           and it is very difficult to find which ones are 
           really needed for simple tasks
  -}

import Graphics.UI.Gtk
import Graphics.UI.Gtk.ModelView as Model
import Graphics.UI.Gtk.Gdk.Events as Ev

main :: IO ()
main = do
   initGUI       -- is start
   window <- windowNew

   list <- listStoreNew ["Vince", "Jhen", "Chris", "Sharon"]

   treeview <- Model.treeViewNewWithModel list
   Model.treeViewSetHeadersVisible treeview True

           -- there should be a simpler way to render a list as the following!
   col <- Model.treeViewColumnNew
   Model.treeViewColumnSetTitle col "colTitle"
   renderer <- Model.cellRendererTextNew
   Model.cellLayoutPackStart col renderer False
   Model.cellLayoutSetAttributes col renderer list
           $ \ind -> [Model.cellText := ind]
   Model.treeViewAppendColumn treeview col

   --tree <- Model.treeViewGetSelection treeview
   --Model.treeSelectionSetMode tree  SelectionSingle
   --Model.onSelectionChanged tree (oneSelection list tree)

   set window [ windowDefaultWidth := 100
               , windowDefaultHeight := 200
               , containerChild := treeview
              ]

   -- here comes the right-click popup       

   eda <- actionNew "EDA" "Edit" Nothing Nothing
   pra <- actionNew "PRA" "Process" Nothing Nothing
   rma <- actionNew "RMA" "Remove" Nothing Nothing
   saa <- actionNew "SAA" "Save" Nothing Nothing

   agr <- actionGroupNew "AGR1" 
   mapM_ (actionGroupAddAction agr) [eda,pra,rma,saa]

   uiman <- uiManagerNew
   uiManagerAddUiFromString uiman uiDecl
   uiManagerInsertActionGroup uiman agr 0

   maybePopup <- uiManagerGetWidget uiman "/ui/popup"
   let pop = case maybePopup of 
            (Just x) -> x
            Nothing -> error "Cannot get popup from string"

   onButtonPress treeview (\x -> if (Ev.eventButton x) == Ev.RightButton
                                 then do 
                               menuPopup (castToMenu pop) Nothing
                               return (Ev.eventSent x)
                                 else return (Ev.eventSent x))

   mapM_ (prAct treeview list) [eda,pra,rma,saa]    


   onDestroy window mainQuit
   widgetShowAll window
   mainGUI
   return ()

uiDecl = "<ui> \
\          <popup>\
\            <menuitem action=\"EDA\" />\
\            <menuitem action=\"PRA\" />\
\            <menuitem action=\"RMA\" />\
\            <separator />\
\            <menuitem action=\"SAA\" />\
\          </popup>\
\        </ui>"   

-- Handle the right-click. You can write a function that'll respond to various 
-- actions, like for example: handleAction "EDA" = do something, etc.    

prAct treeview list a = onActionActivate a $ do 
        name <- actionGetName a
            -- getting the selected row

        tree <- Model.treeViewGetSelection treeview

        -- you can also use treeSelectionGetSelected to get the Iter object
            -- and then convert it to Int by using listStoreIterToIndex and so get
            -- the ListStore item at given index

          sel <- Model.treeSelectionGetSelectedRows tree
        let s = head  (head sel)
        v <- Model.listStoreGetValue list s
        putStrLn ("Action Name: " ++ name ++ " | Item: " ++ v)

 

 我希望它对某人有帮助:) 
 

 干杯 

Okay it seems I'm going be the first one to find answer for my own question :)
 

(1) First of all the example at http://www.muitovar.com/gtk2hs/chap7-2.html didn't work for me because you have two eventButton functions in gtk2hs and you have to use the one from Graphics.UI.Gtk.Gdk.Events. So you have to add at the beginning of the file:
 

import Graphics.UI.Gtk.Gdk.Events as Ev

 

and then add Ev. prefix to eventButton, RightButton and eventSent. It'll work now :)
 

(2) How to respond to right clicks on treeView row:
 

Having solved the aforementioned problem I stumbled upon this example, where it's shown how to respond to selecting a row in treeView. So I mixed those two solutions and came up with something like this (most of the code comes from the treeview example with some of my tweaks):
 

module Main where

 {- an example how to select from a list
   not satisfactory yet:
       - there should be a simpler way to render a simple list
       - i could not convert the model i got back to a list 
           from which to get the value

       - the interface offers a great number of functions 
           and it is very difficult to find which ones are 
           really needed for simple tasks
  -}

import Graphics.UI.Gtk
import Graphics.UI.Gtk.ModelView as Model
import Graphics.UI.Gtk.Gdk.Events as Ev

main :: IO ()
main = do
   initGUI       -- is start
   window <- windowNew

   list <- listStoreNew ["Vince", "Jhen", "Chris", "Sharon"]

   treeview <- Model.treeViewNewWithModel list
   Model.treeViewSetHeadersVisible treeview True

           -- there should be a simpler way to render a list as the following!
   col <- Model.treeViewColumnNew
   Model.treeViewColumnSetTitle col "colTitle"
   renderer <- Model.cellRendererTextNew
   Model.cellLayoutPackStart col renderer False
   Model.cellLayoutSetAttributes col renderer list
           $ \ind -> [Model.cellText := ind]
   Model.treeViewAppendColumn treeview col

   --tree <- Model.treeViewGetSelection treeview
   --Model.treeSelectionSetMode tree  SelectionSingle
   --Model.onSelectionChanged tree (oneSelection list tree)

   set window [ windowDefaultWidth := 100
               , windowDefaultHeight := 200
               , containerChild := treeview
              ]

   -- here comes the right-click popup       

   eda <- actionNew "EDA" "Edit" Nothing Nothing
   pra <- actionNew "PRA" "Process" Nothing Nothing
   rma <- actionNew "RMA" "Remove" Nothing Nothing
   saa <- actionNew "SAA" "Save" Nothing Nothing

   agr <- actionGroupNew "AGR1" 
   mapM_ (actionGroupAddAction agr) [eda,pra,rma,saa]

   uiman <- uiManagerNew
   uiManagerAddUiFromString uiman uiDecl
   uiManagerInsertActionGroup uiman agr 0

   maybePopup <- uiManagerGetWidget uiman "/ui/popup"
   let pop = case maybePopup of 
            (Just x) -> x
            Nothing -> error "Cannot get popup from string"

   onButtonPress treeview (\x -> if (Ev.eventButton x) == Ev.RightButton
                                 then do 
                               menuPopup (castToMenu pop) Nothing
                               return (Ev.eventSent x)
                                 else return (Ev.eventSent x))

   mapM_ (prAct treeview list) [eda,pra,rma,saa]    


   onDestroy window mainQuit
   widgetShowAll window
   mainGUI
   return ()

uiDecl = "<ui> \
\          <popup>\
\            <menuitem action=\"EDA\" />\
\            <menuitem action=\"PRA\" />\
\            <menuitem action=\"RMA\" />\
\            <separator />\
\            <menuitem action=\"SAA\" />\
\          </popup>\
\        </ui>"   

-- Handle the right-click. You can write a function that'll respond to various 
-- actions, like for example: handleAction "EDA" = do something, etc.    

prAct treeview list a = onActionActivate a $ do 
        name <- actionGetName a
            -- getting the selected row

        tree <- Model.treeViewGetSelection treeview

        -- you can also use treeSelectionGetSelected to get the Iter object
            -- and then convert it to Int by using listStoreIterToIndex and so get
            -- the ListStore item at given index

          sel <- Model.treeSelectionGetSelectedRows tree
        let s = head  (head sel)
        v <- Model.listStoreGetValue list s
        putStrLn ("Action Name: " ++ name ++ " | Item: " ++ v)

 

I hope it'll be helpful for someone :)
 

Cheers

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