QGridLayout does not stretch the homemade QWidget over the workspace.

timob256

I don't know how to fix.

displays part of the widget, moreover, a small part, how to fix it so that it does display in the entire application.

Снимок экрана от 2022-07-19 18-03-42.png

here is the code:

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)

project(vikroika VERSION 0.1 LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)

set(PROJECT_SOURCES
        main.cpp
        rascroika.cpp
        rascroika.h
        tochkabutton.cpp
        tochkabutton.h
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(vikroika
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET vikroika APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
    if(ANDROID)
        add_library(vikroika SHARED
            ${PROJECT_SOURCES}
        )
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
    else()
        add_executable(vikroika
            ${PROJECT_SOURCES}
        )
    endif()
endif()

target_link_libraries(vikroika PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

set_target_properties(vikroika PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
)

if(QT_VERSION_MAJOR EQUAL 6)
    qt_finalize_executable(vikroika)
endif()

main.cpp

#include "rascroika.h"

#include <QApplication>
#include <QScreen>
#include <QDebug>

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

    QSize screenSize = qApp->screens().at(0)->availableSize();
    const int width = screenSize.width() / 2.5;
    const int height = screenSize.height() * 0.5;
    w.setGeometry((screenSize.width() - width) / 2.0,
                  (screenSize.height() - height) / 2.0,
                  width,
                  height);

    w.setWindowTitle("Раскройка");

    w.show();
    return a.exec();
}

rascroika.h

#ifndef RASCROIKA_H
#define RASCROIKA_H

#include <QMainWindow>
#include <QVBoxLayout>
#include <QGridLayout>

#include "tochkabutton.h"

class Rascroika : public QMainWindow
{
    Q_OBJECT

public:
    Rascroika(QWidget *parent = nullptr);
    ~Rascroika();

private:

    TochkaButton *_tochkab;
    QGridLayout  *_vbox;
};
#endif // RASCROIKA_H

rascroika.cpp

#include "rascroika.h"

Rascroika::Rascroika(QWidget *parent)
    : QMainWindow(parent)
    , _vbox(new QGridLayout(this))
    , _tochkab(new TochkaButton(this))
{
     _vbox->addWidget(_tochkab,0,0,Qt::AlignJustify);

//    _tochkab->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    _tochkab->setPosition(this->x(),this->y());
    _tochkab->setScale(this->width(),this->height());

//    _tochkab->setPosition(10,10);
//    _tochkab->setScale(100,200);

    this->setLayout(_vbox);
    this->show();
}

Rascroika::~Rascroika()
{
}

tochkabutton.h

#ifndef TOCKABUTTON_H
#define TOCKABUTTON_H

#include <QWidget>
#include <QPainter>
#include <QColor>
#include <QDebug>


class TochkaButton : public QWidget {
    Q_OBJECT
public:
    using QWidget::QWidget;

    // туту сетеры  гетеры
    ///
    /// \brief setColor выбор цвета
    ///
    void setColor(int r, int g, int b, int a);

    ///
    /// \brief setColor выбор цвета "основной" линии
    ///
    void setColorLine(int r, int g, int b, int a);

    ///
    /// \brief setScaleFactor установить коэффициент масштаба
    ///
    void setScale(float height, float width);

    ///
    /// \brief setPosition установить расположение обьекта
    ///
    void setPosition(float x, float y);

private:
    // туту слоты
    QColor   _color        {220, 220, 0, 227};
    QColor   _color_line   {0, 0, 0, 255}; //  ченый не прозрачный
    float    _height        {0};
    float    _width         {0};
    float    _thickness     {0};        // толщина оучки
    float    _x             {0};
    float    _y             {0};


protected:
    virtual void paintEvent(QPaintEvent *event);          // тут рисуем
//    virtual QSize sizeHint() const;                       // тут задаем размеры (возми из иного прмера)
    virtual void mousePressEvent(QMouseEvent * event);    // тут нажатие клавиши (зажатие)
    virtual void mouseReleaseEvent(QMouseEvent * event);  // тут зажатие клавиши (отддатие  )
};

#endif // TOCKABUTTON_H

tochkabutton.cpp

#include "tochkabutton.h"

void TochkaButton::setColor(int r, int g, int b, int a)
{
    _color.setRgb(r,g,b,a);
}

void TochkaButton::setColorLine(int r, int g, int b, int a)
{
    _color_line.setRgb(r,g,b,a);
}

void TochkaButton::setScale(float height, float width)
{
    _height = height;
    _width = width;

    _thickness = (height+width)/100.0;
}

void TochkaButton::setPosition(float x, float y)
{
    _x = x;
    _y = y;
}

void TochkaButton::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);

    painter.setPen(QPen(_color_line, _thickness, Qt::SolidLine));
    painter.setBrush(QBrush(_color));

    qDebug() << "_x" << _x << "_y" << _y << "_width" << _width << "_height" << _height;
    painter.drawRect(_x, _y, _width, _height);

    // проверить несколько вариантов
    painter.setBrush(QBrush(_color_line)); // чтоб центр был круглый
//    painter.drawEllipse(_x+_width/2.0-_thickness, _y+_height/2.0-_thickness, _thickness*2, _thickness*2 );

    // воторой вариант просто точка
    painter.drawPoint(_x+_width/2.0, _y+_height/2.0);
}

void TochkaButton::mousePressEvent(QMouseEvent *event)
{

}

void TochkaButton::mouseReleaseEvent(QMouseEvent *event)
{

}

SGaist

Hi,

You are using a QMainWindow as base class for Rascroika. QMainWindow already has a layout that you cannot replace. You likely also have a run time warning printed when you run your application.

Either change the base class or create a central widget and apply your layout on that one.

Christian Ehrlicher

You don't return any size() or sizeHint() so how should Qt know how much space wour widget needs?

SGaist

Hi,

You are using a QMainWindow as base class for Rascroika. QMainWindow already has a layout that you cannot replace. You likely also have a run time warning printed when you run your application.

Either change the base class or create a central widget and apply your layout on that one.

timob256

@SGaist said in QGridLayout does not stretch the homemade QWidget over the workspace.:

Hi,

You are using a QMainWindow as base class for Rascroika. QMainWindow already has a layout that you cannot replace. You likely also have a run time warning printed when you run your application.

yes

QLayout: Attempting to add QLayout "" to Rascroika "", which already has a layout
QWidget::setLayout: Attempting to set QLayout "" on Rascroika "", which already has a layout

Either change the base class or create a central widget and apply your layout on that one.

I don't understand what to do ;_;

i tried to add layouts to rascroika.cpp file, gives the same error.

rascroika.cpp

#include "rascroika.h"

Rascroika::Rascroika(QWidget *parent)
    : QMainWindow(parent)
    , _vbox(new QGridLayout(this))
    , _tochkab(new TochkaButton(this))
{
    QVBoxLayout *vlay = new QVBoxLayout();
    QHBoxLayout *hlay1 = new QHBoxLayout();

     hlay1->addWidget(_tochkab);
     _tochkab->setPosition(this->x(),this->y());
     _tochkab->setScale(this->width(),this->height());

    hlay1->addStretch(1);
    vlay->addItem(hlay1);

    vlay->addStretch(1);

    this->setLayout(vlay);
    this->show();
}

Rascroika::~Rascroika()
{
}

I don't know how to add my _vbox widget to the layout.

this->addWidget(_tochkab);

error: no member named 'addWidget' in 'Rascroika'

please, tell me what i need to write??????

JonB

@timob256 said in QGridLayout does not stretch the homemade QWidget over the workspace.:

please, tell me what i need to write??????

@SGaist said in QGridLayout does not stretch the homemade QWidget over the workspace.:

Either change the base class or create a central widget and apply your layout on that one.

@timob256 said in QGridLayout does not stretch the homemade QWidget over the workspace.:

I don't know how to add my _vbox widget to the layout.

To which layout? someLayout->addWidget(_tochkab). Not this->addWidget(_tochkab); ("error: no member named 'addWidget' in 'Rascroika'".)

timob256

#include "rascroika.h"

Rascroika::Rascroika(QWidget *parent)
   : QMainWindow(parent)
   , _vbox(new QGridLayout(this))
   , _tochkab(new TochkaButton(this))
{
   _tochkab->setPosition(this->x(),this->y());
   _tochkab->setScale(this->width(),this->height());

   this->setCentralWidget(_tochkab);
   this->show();
}

Снимок экрана от 2022-07-23 14-22-59.png

SGaist

You _vbox variable is now useless, you should remove it.

Passing a parent to a layout when creating it automatically applies that layout to the parent. That's not what you want here (beside the fact that there are no use in setting a widget on a QMainWindow object.