3 files changed, 45 insertions, 15 deletions

diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 839b2c3..447cf0c 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -13,26 +13,41 @@ MainWindow::MainWindow(const QStringList &filePaths, QWidget *parent)
   if (!filePaths.isEmpty()) {
     current.load(filePaths.first());
     setWindowTitle(title_format.arg(filePaths.first()));
-    resizePixmap();
+    fit();
   }
 
-  connect(ui->original_toolButton, &QToolButton::clicked, this,
-          [this]() { ui->label->setPixmap(current); });
+  connect(ui->ori_toolButton, &QToolButton::clicked, [this]() { scale(1.0); });
+  connect(ui->fit_toolButton, &QToolButton::clicked, [this]() { fit(); });
 
-  connect(ui->fit_toolButton, &QToolButton::clicked, this,
-          [this]() { resizePixmap(); });
+  connect(ui->scale_slider, &QSlider::sliderMoved,
+          [this](int value) { scale(static_cast<double>(value) / 100.0f); });
 }
 
 MainWindow::~MainWindow() { delete ui; }
 
 void MainWindow::resizeEvent(QResizeEvent *event) {
-  resizePixmap();
+  fit();
   QMainWindow::resizeEvent(event);
 }
 
-void MainWindow::resizePixmap() {
-  const auto size =
-      ui->scrollArea->viewport()->size().boundedTo(current.size());
+void MainWindow::fit() {
+  const auto pixmpSize = current.size();
+  const auto scaleSize =
+      pixmpSize.scaled(ui->scrollArea->viewport()->size(), Qt::KeepAspectRatio);
+
+  const int scale = std::min(scaleSize.width() * 100 / pixmpSize.width(),
+                             scaleSize.height() * 100 / pixmpSize.height());
+
+  ui->label->setPixmap(
+      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+  ui->scale_slider->setValue(scale);
+  ui->scale_label->setText(scale_format.arg(scale));
+}
+
+void MainWindow::scale(double scale) {
+  const auto scaleSize = current.size() * scale;
   ui->label->setPixmap(
-      current.scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+  ui->scale_slider->setValue(scale * 100);
+  ui->scale_label->setText(scale_format.arg(scale * 100));
 }
diff --git a/src/mainwindow.h b/src/mainwindow.h
index dfd704b..f6b8c32 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -18,9 +18,11 @@ protected:
   void resizeEvent(QResizeEvent *event) override;
 
 private:
-  void resizePixmap();
+  void fit();
+  void scale(double scale);
 
   Ui::MainWindow *ui;
   QPixmap current;
   const QString title_format{"qimv [%1]"};
+  const QString scale_format{"%1%"};
 };
diff --git a/src/mainwindow.ui b/src/mainwindow.ui
index 733b06e..2676638 100644
--- a/src/mainwindow.ui
+++ b/src/mainwindow.ui
@@ -15,6 +15,9 @@
   </property>
   <widget class="QWidget" name="centralwidget">
    <layout class="QVBoxLayout" name="verticalLayout_2">
+    <property name="spacing">
+     <number>2</number>
+    </property>
     <property name="leftMargin">
      <number>0</number>
     </property>
@@ -38,7 +41,7 @@
          <x>0</x>
          <y>0</y>
          <width>798</width>
-         <height>548</height>
+         <height>552</height>
         </rect>
        </property>
        <layout class="QVBoxLayout" name="verticalLayout">
@@ -87,9 +90,9 @@
        </spacer>
       </item>
       <item>
-       <widget class="QToolButton" name="original_toolButton">
+       <widget class="QToolButton" name="ori_toolButton">
         <property name="text">
-         <string>orig</string>
+         <string>original</string>
         </property>
        </widget>
       </item>
@@ -101,12 +104,22 @@
        </widget>
       </item>
       <item>
-       <widget class="QSlider" name="horizontalSlider">
+       <widget class="QSlider" name="scale_slider">
+        <property name="maximum">
+         <number>100</number>
+        </property>
         <property name="orientation">
          <enum>Qt::Horizontal</enum>
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="QLabel" name="scale_label">
+        <property name="text">
+         <string>0%</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </item>
    </layout>