c++qtc++11qpushbuttonqsettings
save and load modifications with qsettings
I have 2 windows ( window 1 ) & ( window 2 ) : see pictures. -On window 1 there is an "edit" button that should open window 2 ( and load modifs saved on window 2 ) -On window 2, I have 96 buttons which are initially green, if I click on one it becomes red. The "OK" button that I have should close window 2 and save the modifications ( red buttons ). If I re-open window 2 by clicking on the "edit" button of window 1, the red buttons of the last step should stay red and become uncheckable. How can I do that with QSettings ? This is my code of the savesettings method : ( I don't know if it is correct or not but I think yes !)
void Vessels::SaveSettings()
{
QSettings setting("My_vessels","My_selected_vessels");
setting.beginGroup("Vessels");
if (ui->pushButton_4->isChecked()){
ui->pushButton_4->setCheckable(false);}
setting.setValue("selected",ui->pushButton_4->isCheckable());
setting.endGroup();
}
I am facing 2 problems : 1) The save and load buttons ( which are in this case respectively "OK" and "Edit" ) are not from the same window. 2) I don't know how to implement the loadSettings method that I should append to the "Edit" button.
Solution
Here is your solution, as I have come up with, please test on your side, its working for me:
File: QSettings2.pro
#-------------------------------------------------
#
# Project created by QtCreator 2020-01-23T19:21:17
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = QSettings2
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
CONFIG += c++11
SOURCES += \
dialog.cpp \
main.cpp \
mainwindow.cpp
HEADERS += \
dialog.h \
mainwindow.h
FORMS += \
dialog.ui \
mainwindow.ui
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
File: dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
class QLabel;
class QSettings;
namespace Ui {
class Dialog;
}
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QSettings *settings, QWidget *parent = nullptr);
~Dialog();
private slots:
void on_pushButtonOK_clicked();
void on_pushButtonCancel_clicked();
private:
QLabel* CreateNewLabel(QString text, QWidget* parent);
void saveSettings();
void loadSettings();
Ui::Dialog *ui;
QSettings *m_settings;
const int ROWS = 8, COLS = 12;
};
#endif // DIALOG_H
File: mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class QSettings;
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_pushButton_clicked();
private:
Ui::MainWindow *ui;
QSettings* m_settings;
};
#endif // MAINWINDOW_H
File: dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"
#include <QGridLayout>
#include <QDebug>
#include <QSettings>
Dialog::Dialog(QSettings *settings, QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog),
m_settings(settings)
{
ui->setupUi(this);
ui->frame->setStyleSheet(QString());//we did draw border just for design time view
ui->pushButton_Circular->hide();
QGridLayout *gridLayout = new QGridLayout();
//gridLayout->setColumnStretch(0, 1);
//gridLayout->setRowStretch(0, 1);
for(int i = 1; i <= COLS; i++)
{
//gridLayout->setColumnStretch(i, 1);
QLabel *label = CreateNewLabel(QString::number(i), this);
gridLayout->addWidget(label, 0, i);
}
for(int i = 1; i <= ROWS; i++)
{
//gridLayout->setRowStretch(i, 1);
QLabel *label = CreateNewLabel(QString("%1").arg(static_cast<char>('A' + i -1)), this);
gridLayout->addWidget(label, i, 0);
}
QString buttonIdText;
for(int i = 1; i <= ROWS; i++)
{
for(int j = 1; j<= COLS; j++)
{
QPushButton *button = new QPushButton(this);
button->setMaximumSize(40, 40);
button->setMinimumSize(40, 40);
button->setStyleSheet(ui->pushButton_Circular->styleSheet());
button->setCheckable(true);
buttonIdText = QString::number((i-1)*COLS + j);
button->setText(buttonIdText);
button->setObjectName("GridButton_" + buttonIdText);
gridLayout->addWidget(button, i, j);
}
}
ui->frame->setLayout(gridLayout);
loadSettings();
}
Dialog::~Dialog()
{
delete ui;
}
QLabel *Dialog::CreateNewLabel(QString text, QWidget *parent)
{
QLabel *label = new QLabel(text, parent);
label->setFont(QFont(label->font().family(), 10, 500));
label->setAlignment(Qt::AlignCenter);
label->setStyleSheet("background-color: rgb(170, 0, 0);");
label->setMaximumSize(40, 40);
label->setMinimumSize(40, 40);
return label;
}
void Dialog::saveSettings()
{
QString key;
QVariant value;
m_settings->beginGroup("GridButtonsStatus");
foreach(QObject *childObject, ui->frame->children())
{
if(QPushButton *button = qobject_cast<QPushButton*>(childObject))
{
key = button->objectName();
value = button->isChecked();
m_settings->setValue(key, value);
}
}
m_settings->endGroup();
m_settings->sync();
}
void Dialog::loadSettings()
{
QString key;
m_settings->beginGroup("GridButtonsStatus");
for(int i = 1; i <= ROWS * COLS; i++)
{
key = QString("GridButton_%1").arg(i);
qDebug() << "--- key = " << key <<", value = " << m_settings->value(key) << endl;
QPushButton *button = ui->frame->findChild<QPushButton*>(key); //key was push button object name
if(button)
{
bool is_Checked = m_settings->value(key, false).toBool();
button->setChecked(is_Checked);
button->setEnabled(!is_Checked);
}
}
m_settings->endGroup();
}
void Dialog::on_pushButtonOK_clicked()
{
saveSettings();
close();
}
void Dialog::on_pushButtonCancel_clicked()
{
close();
}
File: main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
File: mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "dialog.h"
#include <QSettings>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow), m_settings(new QSettings(qAppName() + ".ini", QSettings::IniFormat))
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
#include <QDebug>
void MainWindow::on_pushButton_clicked()
{
Dialog dialog(m_settings);
dialog.exec();
}
File: dialog.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Dialog</class>
<widget class="QDialog" name="Dialog">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>730</width>
<height>501</height>
</rect>
</property>
<property name="windowTitle">
<string>Dialog</string>
</property>
<widget class="QLabel" name="label">
<property name="geometry">
<rect>
<x>50</x>
<y>10</y>
<width>331</width>
<height>31</height>
</rect>
</property>
<property name="font">
<font>
<pointsize>14</pointsize>
<weight>75</weight>
<bold>true</bold>
</font>
</property>
<property name="text">
<string>Choose your vessels:</string>
</property>
</widget>
<widget class="QPushButton" name="pushButtonOK">
<property name="geometry">
<rect>
<x>560</x>
<y>440</y>
<width>160</width>
<height>41</height>
</rect>
</property>
<property name="text">
<string>OK</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton_Circular">
<property name="geometry">
<rect>
<x>20</x>
<y>440</y>
<width>40</width>
<height>40</height>
</rect>
</property>
<property name="styleSheet">
<string notr="true">QPushButton {
border-radius: 20px;
border-style: outset;
background: qradialgradient(
cx: 0.3, cy: -0.4, fx: 0.3, fy: -0.4,
radius: 1.35, stop: 0 green, stop: 1 #009900
);
padding: 5px;
}
QPushButton:hover {
background: qradialgradient(
cx: 0.3, cy: -0.4, fx: 0.3, fy: -0.4,
radius: 1.35, stop: 0 red, stop: 1 #004400
);
}
QPushButton:checked {
border-style: inset;
background: qradialgradient(
cx: 0.4, cy: -0.1, fx: 0.4, fy: -0.1,
radius: 1.35, stop: 0 red, stop: 1 #990000
);
}
</string>
</property>
<property name="text">
<string/>
</property>
<property name="checkable">
<bool>true</bool>
</property>
<property name="checked">
<bool>false</bool>
</property>
</widget>
<widget class="QFrame" name="frame">
<property name="geometry">
<rect>
<x>20</x>
<y>50</y>
<width>520</width>
<height>360</height>
</rect>
</property>
<property name="sizePolicy">
<sizepolicy hsizetype="Preferred" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>520</width>
<height>360</height>
</size>
</property>
<property name="maximumSize">
<size>
<width>520</width>
<height>360</height>
</size>
</property>
<property name="styleSheet">
<string notr="true">border:1px solid red</string>
</property>
<property name="frameShape">
<enum>QFrame::StyledPanel</enum>
</property>
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
</widget>
<widget class="QPushButton" name="pushButtonCancel">
<property name="geometry">
<rect>
<x>370</x>
<y>440</y>
<width>160</width>
<height>41</height>
</rect>
</property>
<property name="text">
<string>CANCEL</string>
</property>
</widget>
<zorder>frame</zorder>
<zorder>label</zorder>
<zorder>pushButtonOK</zorder>
<zorder>pushButton_Circular</zorder>
<zorder>pushButtonCancel</zorder>
</widget>
<resources/>
<connections/>
</ui>
File: mainwindow.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>573</width>
<height>374</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget">
<widget class="QLabel" name="label">
<property name="geometry">
<rect>
<x>40</x>
<y>20</y>
<width>271</width>
<height>81</height>
</rect>
</property>
<property name="font">
<font>
<pointsize>14</pointsize>
<weight>75</weight>
<bold>true</bold>
</font>
</property>
<property name="text">
<string>Prepare YourSolutions</string>
</property>
</widget>
<widget class="QLabel" name="label_2">
<property name="geometry">
<rect>
<x>50</x>
<y>150</y>
<width>91</width>
<height>31</height>
</rect>
</property>
<property name="font">
<font>
<pointsize>9</pointsize>
</font>
</property>
<property name="text">
<string>Solution 1</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>154</x>
<y>152</y>
<width>101</width>
<height>31</height>
</rect>
</property>
<property name="text">
<string>Edit</string>
</property>
</widget>
</widget>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
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