added a GUI

1 files changed, 66 insertions, 0 deletions

diff --git a/src/utils/aspectratiowidget/aspectratiowidget.hpp b/src/utils/aspectratiowidget/aspectratiowidget.hpp
new file mode 100644
index 0000000..9a5f81c
--- /dev/null
+++ b/src/utils/aspectratiowidget/aspectratiowidget.hpp
@@ -0,0 +1,66 @@
+#ifndef ASPECTRATIOWIDGET_HPP
+#define ASPECTRATIOWIDGET_HPP
+
+#include <QWidget>
+#include <QBoxLayout>
+
+class AspectRatioWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    AspectRatioWidget(QWidget *parent = 0) : QWidget(parent)
+    {
+        m_layout = new QHBoxLayout();
+        m_layout->setSpacing(0);
+        m_layout->setContentsMargins(0, 0, 0, 0);
+        setLayout(m_layout);
+    }
+
+    // the widget we want to keep the ratio
+    void setAspectWidget(QWidget* widget, const double ratio = 1.0) {
+        m_aspect_widget = widget;
+        m_layout->addWidget(widget);
+        m_ratio = ratio;
+    }
+    void setRatio(const double ratio) {
+        m_ratio = ratio;
+        applyAspectRatio();
+    }
+
+protected:
+    void resizeEvent(QResizeEvent *event) {
+        (void)event;
+        applyAspectRatio();
+    }
+
+public slots:
+    void applyAspectRatio() {
+        int w = this->width();
+        int h = this->height();
+        double aspect = static_cast<double>(h)/static_cast<double>(w);
+
+        if(aspect < m_ratio) // parent is too wide
+        {
+            int target_width = static_cast<int>(static_cast<double>(h)/m_ratio);
+            m_aspect_widget->setMaximumWidth(target_width);
+            m_aspect_widget->setMaximumHeight(h);
+
+        }
+        else // parent is too high
+        {
+            int target_heigth = static_cast<int>(static_cast<double>(w)*m_ratio);
+            m_aspect_widget->setMaximumHeight(target_heigth);
+            m_aspect_widget->setMaximumWidth(w);
+        }
+    }
+
+private:
+    QHBoxLayout* m_layout;
+
+    QWidget* m_aspect_widget;
+
+    double m_ratio;
+};
+
+#endif // ASPECTRATIOWINDOW_H
+