More code

Qt-Widgets-and-more/WidgetPromotion/FileSelector.cpp

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+/* MIT License
+
+Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "FileSelector.h"
+#include <QFileDialog>
+#include <QLayout>
+#include <QLineEdit>
+#include <QToolButton>
+
+FileSelector::FileSelector(QWidget *parent)
+    : QWidget(parent)
+{
+    auto *layout = new QHBoxLayout(this);
+    layout->setContentsMargins(0, 0, 0, 0);
+
+    m_lineEdit = new QLineEdit(this);
+    layout->addWidget(m_lineEdit);
+
+    connect(m_lineEdit, &QLineEdit::editingFinished, this, &FileSelector::emitPathChanged);
+
+    auto *button = new QToolButton;
+    button->setText("...");
+    layout->addWidget(button);
+
+    connect(button, &QToolButton::clicked, this, &FileSelector::chooseFile);
+
+    setFocusProxy(m_lineEdit);
+}
+
+void FileSelector::setMode(Mode mode)
+{
+    if (mode != m_mode) {
+        m_mode = mode;
+        emit modeChanged(mode);
+    }
+}
+
+FileSelector::Mode FileSelector::mode() const
+{
+    return m_mode;
+}
+
+void FileSelector::setPath(const QString &fileName)
+{
+    m_lineEdit->setText(fileName);
+    m_lastEmittedPath = fileName;
+}
+
+QString FileSelector::path() const
+{
+    return m_lineEdit->text();
+}
+
+void FileSelector::chooseFile()
+{
+    QString fileName;
+    if (mode() == FileOpen)
+        fileName = QFileDialog::getOpenFileName(this, QString(), m_lineEdit->text());
+    else if (mode() == FileSave)
+        fileName = QFileDialog::getSaveFileName(this, QString(), m_lineEdit->text());
+    else
+        fileName = QFileDialog::getExistingDirectory(this, QString(), m_lineEdit->text());
+
+    if (!fileName.isEmpty()) {
+        m_lineEdit->setText(fileName);
+        emitPathChanged();
+    }
+}
+
+void FileSelector::emitPathChanged()
+{
+    QString newPath = m_lineEdit->text();
+    if (newPath != m_lastEmittedPath) {
+        m_lastEmittedPath = newPath;
+        emit pathChanged(newPath);
+    }
+}

Qt-Widgets-and-more/WidgetPromotion/FileSelector.h

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+/* MIT License
+
+Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#pragma once
+
+#include <QWidget>
+
+class QLineEdit;
+
+class FileSelector : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(Mode mode READ mode WRITE setMode NOTIFY modeChanged)
+    Q_PROPERTY(QString path READ path WRITE setPath NOTIFY pathChanged)
+
+public:
+    explicit FileSelector(QWidget *parent = nullptr);
+
+    QString path() const;
+    void setPath(const QString &path);
+
+    enum Mode { FileOpen, FileSave, Directory };
+    Mode mode() const;
+    void setMode(Mode mode);
+
+signals:
+    void pathChanged(const QString &path);
+    void modeChanged(Mode mode);
+
+private slots:
+    void chooseFile();
+
+private:
+    void emitPathChanged();
+
+    QLineEdit *m_lineEdit;
+    Mode m_mode = FileSave;
+    QString m_lastEmittedPath;
+};

Qt-Widgets-and-more/WidgetPromotion/ImageViewer.cpp

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+/* MIT License
+
+Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "ImageViewer.h"
+#include "ui_ImageViewer.h"
+
+ImageViewer::ImageViewer(QWidget *parent)
+    : QWidget(parent)
+    , ui(new Ui::ImageViewer)
+{
+    ui->setupUi(this);
+    ui->fileSelector->setMode(FileSelector::FileOpen);
+    connect(ui->fileSelector, &FileSelector::pathChanged, [this](const QString &fileName) {
+        QPixmap image = QPixmap(fileName).scaled(600, 600, Qt::KeepAspectRatio);
+        ui->image->setPixmap(image);
+    });
+}
+
+ImageViewer::~ImageViewer()
+{
+    delete ui;
+}

Qt-Widgets-and-more/WidgetPromotion/ImageViewer.h

@@ -0,0 +1,42 @@
+/* MIT License
+
+Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#pragma once
+
+#include <QWidget>
+
+namespace Ui {
+class ImageViewer;
+}
+
+class ImageViewer : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit ImageViewer(QWidget *parent = nullptr);
+    ~ImageViewer();
+
+private:
+    Ui::ImageViewer *ui;
+};

Qt-Widgets-and-more/WidgetPromotion/ImageViewer.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ImageViewer</class>
+ <widget class="QWidget" name="ImageViewer">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Image Viewer</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout" stretch="0,1">
+   <item>
+    <widget class="FileSelector" name="fileSelector" native="true"/>
+   </item>
+   <item>
+    <widget class="QLabel" name="image">
+     <property name="font">
+      <font>
+       <pointsize>24</pointsize>
+      </font>
+     </property>
+     <property name="text">
+      <string>Load an image.</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignCenter</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>FileSelector</class>
+   <extends>QWidget</extends>
+   <header>FileSelector.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

Qt-Widgets-and-more/WidgetPromotion/WidgetPromotion.pro

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+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++11
+
+# You can make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    FileSelector.cpp \
+    ImageViewer.cpp \
+    main.cpp
+
+HEADERS += \
+    FileSelector.h \
+    ImageViewer.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+FORMS += \
+    ImageViewer.ui

Qt-Widgets-and-more/WidgetPromotion/main.cpp

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+/* MIT License
+
+Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "ImageViewer.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    ImageViewer viewer;
+    viewer.show();
+    return a.exec();
+}