Fix some issues with scaling on smaller screens.

src/installerprompt.cpp

@@ -1,4 +1,5 @@
 #include <QProcess>
+#include <QScreen>
 #include "installerprompt.h"
 #include "./ui_installerprompt.h"
 
@@ -8,13 +9,22 @@ InstallerPrompt::InstallerPrompt(QWidget *parent)
 {
     ui->setupUi(this);
 
-    // Set the background image, and let it change with the release
+    // Set the background image and scale it
     QPixmap bg("../img/background.png");
-    bg = bg.scaled(this->size(), Qt::IgnoreAspectRatio);
+    QScreen *screen = QGuiApplication::primaryScreen();
+    QRect screenGeometry = screen->geometry();
+
+    int height = screenGeometry.height();
+    int width = screenGeometry.width();
+    bg = bg.scaled(width, height, Qt::KeepAspectRatio);
+
     QPalette palette;
     palette.setBrush(QPalette::Window, bg);
     this->setPalette(palette);
 
+    // Resize the layout widget to the screen size.
+    ui->gridLayoutWidget->resize(width, height);
+
     // Set the button colors
     QString css = "background-color: rgba(0, 104, 200, 100); color: white; border-radius: 15px;";
     ui->tryLubuntu->setAttribute(Qt::WA_TranslucentBackground);

src/installerprompt.ui

@@ -6,9 +6,21 @@
    <rect>
     <x>0</x>
     <y>0</y>
+    <width>680</width>
+    <height>420</height>
+   </rect>
+  </property>
+  <property name="minimumSize">
+   <size>
+    <width>680</width>
+    <height>420</height>
+   </size>
+  </property>
+  <property name="maximumSize">
+   <size>
     <width>1920</width>
     <height>1080</height>
-   </rect>
+   </size>
   </property>
   <property name="windowTitle">
    <string>Try or Install Lubuntu</string>

src/main.cpp

@@ -6,7 +6,6 @@ int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     InstallerPrompt w;
-    w.setWindowState(Qt::WindowFullScreen);
-    w.show();
+    w.showFullScreen();
     return a.exec();
 }