IscanderChe
IscanderCheJune 29, 2019, 12:09 p.m.

Как отобразить QPainter в кастомном виджете с фиксированными размерами

Разрабатываю виджет для просмотра изображений в миниатюре.

Что получилось: показать изображение в рамке (см. прицеп). Но беда в том, что при ресайзе основного виджета виджеты с картинками тоже ресайзятся (опять же см. прицеп), чего делать уже не надо. Как решить эту задачу, помогите, плиз.

// widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
};

#endif // WIDGET_H

// widget.cpp

#include "widget.h"
#include "paintwidget.h"
#include <QVBoxLayout>
#include <QHBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    PaintWidget* paintWidget1 = new PaintWidget(parent);
    PaintWidget* paintWidget2 = new PaintWidget(parent);
    QVBoxLayout* layoutV = new QVBoxLayout;
    layoutV->addWidget(paintWidget1);
    layoutV->addWidget(paintWidget2);

    setLayout(layoutV);
}

Widget::~Widget()
{

}

// paintwidget.h

#ifndef PAINTWIDGET_H
#define PAINTWIDGET_H

#include <QWidget>

class PaintWidget : public QWidget
{
    Q_OBJECT
public:
    explicit PaintWidget(QWidget *parent = 0);

protected:
    void paintEvent(QPaintEvent*);

private:
    int rectPhotoX;
    int rectPhotoY;
    int rectPhotoWidth;
    int rectPhotoHeight;
};

#endif // PAINTWIDGET_H

// paintwidget.cpp

#include "paintwidget.h"
#include <QPainter>

PaintWidget::PaintWidget(QWidget *parent) : QWidget(parent)
{
}

void PaintWidget::paintEvent(QPaintEvent*)
{
    QPainter painter(this);

    rectPhotoX = 0;
    rectPhotoY = 0;
    rectPhotoWidth = 110;
    rectPhotoHeight = 110;
    int rectPhotoRadius = 5;


    QRect rect(rectPhotoX, rectPhotoY, rectPhotoWidth, rectPhotoHeight);
    painter.setClipRect(rect);

    QBrush brush(Qt::white, Qt::SolidPattern);
    painter.fillRect(rect, brush);

    QImage img(":/images/DSC_0024.jpg");

    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setBrush(QBrush(Qt::white));
    painter.setPen(QPen(Qt::black, 1, Qt::DotLine));
    QRect rectPhoto(rectPhotoX, rectPhotoY, rectPhotoWidth, rectPhotoHeight);
    painter.drawRoundedRect(rectPhoto, rectPhotoRadius, rectPhotoRadius);

    int minimumOffset = 10;
    int maximumWidthPhotoView = rectPhotoWidth - minimumOffset * 2;
    int maximumHeightPhotoView = rectPhotoHeight - minimumOffset * 2;
    int coefficientWidth = img.width() / maximumWidthPhotoView;
    int coefficientHeight = img.height() / maximumHeightPhotoView;
    int coefficient = 0;

    if(coefficientWidth > coefficientHeight)
        coefficient = coefficientWidth;
    else
        coefficient = coefficientHeight;

    int realWidthPhotoView = img.width() / coefficient;
    int realHeightPhotoView = img.height() / coefficient;
    int offsetX = (rectPhotoWidth - realWidthPhotoView) / 2;
    int offsetY = (rectPhotoHeight - realHeightPhotoView) / 2;
    int photoViewX = rectPhotoX + offsetX;
    int photoViewY = rectPhotoY + offsetY;
    QImage img2 = img.scaled(realWidthPhotoView, realHeightPhotoView);
    painter.drawImage(photoViewX, photoViewY, img2);
}

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1
IscanderChe
  • June 29, 2019, 3:20 p.m.
  • The answer was marked as a solution.

Удалось решить так:

PaintWidget::PaintWidget(QWidget *parent) : QWidget(parent)
{
    setMinimumWidth(110);
    setMinimumHeight(110);
}

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