How to set switching screen condition?

RiceBall

I'm a new hand.
I follow some training video to make program.
Now I make a dialog button to select folder it need to include 2 files(apps-general.xml / settings-general.xml)
And Next button need to check does it comfort condition.
If it is correct,it can switch to another screen.
If wrong,it can't switch screen.

main.cpp

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


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

    if(w.exec() == QDialog::Accepted)
    {
        m.show();
        return a.exec();
    }
    else return 0;
}

dialog.h

//
#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QFileInfo>
#include <QTextBrowser>
#include <QVBoxLayout>
#include <QString>
#include <QMessageBox>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
    void showFile();                            //宣告"開啟對話視窗選擇資料夾位置"函數

    QString file, file_name, file_path;
    QFileInfo fi;
    QTextBrowser *textBrowser_ANPRResult;
    QString str1,str2;
    QString checkstep;
    QMessageBox msg;


private:
    Ui::Dialog *ui;

private slots:                              //宣告訊號溝槽位置

    void on_pushButton_3_clicked();
    void on_pushButton_2_clicked();
    void on_pushButton_clicked();
};

#endif // DIALOG_H

dialog.cpp

//#include "dialog.h"
#include "ui_dialog.h"

#include <QFileDialog>
#include <QStringList>
#include <QDialog>
#include <QMessageBox>
#include <QFileInfo>
#include <QString>

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

}

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


void Dialog::showFile()                                                 //定義showFile函數功能(產生對話視窗，選擇資料夾)
{

    QFileDialog* fileDialog = new QFileDialog(this);                        //設定檔案對話視窗

        fileDialog->setWindowTitle("選取iHMI資料夾");                        //設定標題
        //fd->setDirectory(buf);
        fileDialog->setFileMode( QFileDialog::DirectoryOnly );              //設定僅能選取資料夾格式
        QStringList fileName;                                               //定義字串陣列名稱 fileName

        if ( fileDialog->exec() == QDialog::Accepted )                      //判斷如果點選確認後的判斷式
        {
            fileName = fileDialog->selectedFiles();                         //定義擷取的fileDialog資料到fileName
            //srcDir.setPath(fileName.at(0));
            ui->textBrowser->append(fileName.join(","));                    //將fileName送到textBrowser視窗顯示，並每個物件都透過(,)分隔
        }
        else
        {
            return;
        }


        QString dir1 = fileName.join(",");   //將fileName 從QStringList轉換成QString 文字
        QString dir2 = fileName.join(",");   //將fileName 從QStringList轉換成QString 文字
        QString check1 = "/apps-general.xml";
        QString check2 = "/settings-general.xml";
         str1= dir1.append(check1);         //將路徑與固定檔案結合
         str2= dir2.append(check2);         //將路徑與固定檔案結合

         if(QFileInfo(str1).exists() && QFileInfo(str2).exists()){              //指定文件確認是否有找到
             msg.setText("指定位置正確，開始進行""下一步""設定");
             msg.exec();
             checkstep = "OK";
         }
         else{
             msg.setText("apps-general.xml或\n"
                         "settings-general.xml\n"
                         "檔案沒找到，請重新指向路徑");
             msg.exec();
             checkstep = "NG";
         }

}

void Dialog::on_pushButton_3_clicked()
{
    showFile();
}


void Dialog::on_pushButton_2_clicked()
{
    close();
}

void Dialog::on_pushButton_clicked()
{

    if (checkstep == "OK")
    {}
    else {
        return ;
    }

}

mrjj

Hi and welcome to the forums.
What would next screen be ?
The main window ?

You could add
QString Dialog::GetCheckStepStatus() {
return checkstep;
}
and then in main do

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    MainWindow m;
   QDialog::DialogCode res = w.exec();
    if(res  == QDialog::Accepted && w.GetCheckStepStatus() == "OK" )
    {
        m.show();
        return a.exec();
    }
    else return 0;
}

Note, instead of QString, checkstep could just be a bool to return true/false.

Also, it will still qui the application on cancel or if check is not good.
If you want to ask for folder again, you could use a while loop.

RiceBall

@mrjj said in How to set swiching screen condition?:

QString Dialog::GetCheckStepStatus() {
return checkstep;
}

Thank you mrjj's reply.

My next screen will change to main window,it is correct.
QString Dialog::GetCheckStepStatus() {return checkstep;}
Where should I add ?

Add to this part ?? Or ??

//
if(QFileInfo(str1).exists() && QFileInfo(str2).exists()){              //指定文件確認是否有找到
             msg.setText("指定位置正確，開始進行""下一步""設定");
             msg.exec();
             checkstep = "OK";
         }
         else{
             msg.setText("apps-general.xml或\n"
                         "settings-general.xml\n"
                         "檔案沒找到，請重新指向路徑");
             msg.exec();
             checkstep = "NG";
         }

SGaist

Hi and welcome to devnet,

Aren't you reimplementing QWizard ?

mrjj

@RiceBall said in How to set swiching screen condition?:

QString Dialog::GetCheckStepStatus() {return checkstep;}

Hi
as a new function to the Dialog class.

RiceBall

0_1556169834494_52d2bb79-56c0-4370-b30e-65f6f939b320-image.png

Sorry , I am not sure that is your meaning ??

jsulm

@RiceBall Did you add GetCheckStepStatus() to your class declaration in the header file?

class Dialog
{
public:
    QString GetCheckStepStatus();
};

RiceBall

@mrjj said in How to set switching screen condition?:

QDialog::DialogCode res = w.exec();
if(res == QDialog::Accepted && w.GetCheckStepStatus() == "OK" )
{
m.show();
return a.exec();
}

I have edit in this ,but now I show another alarm

0_1556185150720_6f680fde-50c2-4ec9-8547-73c35c2daa80-image.png

mrjj

Hi
include QDialog

jsulm

@RiceBall

DialogCode is a member variable of Dialog, so

DialogCode res = w.exec();

is simply invalid C++. What do you actually want to do in that line?
2. DialogCode is a QString and you're trying to assign an int to it. Again invalid C++.

Why not simply

int res = w.exec();

?

mrjj

Hi
It's actually an enum.
enum DialogCode { Rejected, Accepted };
but yes int will work just as fine as long they dont use enum class.
Besides exec just returns int.
My fault. i showed QDialog::DialogCode

RiceBall

@jsulm said in How to set switching screen condition?:

@RiceBall

DialogCode is a member variable of Dialog, so
DialogCode res = w.exec();
is simply invalid C++. What do you actually want to do in that line?
2. DialogCode is a QString and you're trying to assign an int to it. Again invalid C++.

Why not simply
int res = w.exec();
?

It's work, Thank you for your reply.

My final code like this

dialog.h

//
#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QFileInfo>
#include <QTextBrowser>
#include <QVBoxLayout>
#include <QString>
#include <QMessageBox>


namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
    void showFile();                            //宣告"開啟對話視窗選擇資料夾位置"函數

    QString file, file_name, file_path;
    QFileInfo fi;
    QTextBrowser *textBrowser_ANPRResult;
    QString str1,str2;
    QString checkstep;
    QMessageBox msg;

    QString GetCheckStepStatus();
    QString DialogCode;





private:
    Ui::Dialog *ui;






private slots:                              //宣告訊號溝槽位置

    void on_pushButton_3_clicked();
    void on_pushButton_2_clicked();
    void on_pushButton_clicked();
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

#include <QFileDialog>
#include <QStringList>
#include <QDialog>
#include <QMessageBox>
#include <QFileInfo>
#include <QString>

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

}

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


QString Dialog::GetCheckStepStatus() {
return checkstep;
}

void Dialog::showFile()                                                 //定義showFile函數功能(產生對話視窗，選擇資料夾)
{

    QFileDialog* fileDialog = new QFileDialog(this);                        //設定檔案對話視窗

        fileDialog->setWindowTitle("選取iHMI資料夾");                        //設定標題
        //fd->setDirectory(buf);
        fileDialog->setFileMode( QFileDialog::DirectoryOnly );              //設定僅能選取資料夾格式
        QStringList fileName;                                               //定義字串陣列名稱 fileName

        if ( fileDialog->exec() == QDialog::Accepted )                      //判斷如果點選確認後的判斷式
        {
            fileName = fileDialog->selectedFiles();                         //定義擷取的fileDialog資料到fileName
            //srcDir.setPath(fileName.at(0));
            ui->textBrowser->append(fileName.join(","));                    //將fileName送到textBrowser視窗顯示，並每個物件都透過(,)分隔
        }
        else
        {
            return;
        }


        QString dir1 = fileName.join(",");   //將fileName 從QStringList轉換成QString 文字
        QString dir2 = fileName.join(",");   //將fileName 從QStringList轉換成QString 文字
        QString check1 = "/apps-general.xml";
        QString check2 = "/settings-general.xml";
         str1= dir1.append(check1);         //將路徑與固定檔案結合
         str2= dir2.append(check2);         //將路徑與固定檔案結合





         if(QFileInfo(str1).exists() && QFileInfo(str2).exists()){              //指定文件確認是否有找到
             msg.setText("指定位置正確，開始進行""下一步""設定");
             msg.exec();
             checkstep = "OK";
         }
         else{
             msg.setText("apps-general.xml或\n"
                         "settings-general.xml\n"
                         "檔案沒找到，請重新指向路徑");
             msg.exec();
             checkstep = "NG";
         }

}

void Dialog::on_pushButton_3_clicked()
{
    showFile();
}


void Dialog::on_pushButton_2_clicked()
{
    close();
}

void Dialog::on_pushButton_clicked()
{
}

main.cpp

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


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    MainWindow m;
    int res = w.exec();

     if(res  == QDialog::Accepted && w.GetCheckStepStatus() == "OK" )
     {
         m.show();
         return a.exec();
     }
    else return 0;
}

0_1556204386541_final code.gif