LibGUI: Split OpacitySlider into vertical and horizontal helper classes

Userland/Libraries/LibGUI/Forward.h

@@ -33,6 +33,7 @@ class Frame;
 class GroupBox;
 class HeaderView;
 class HorizontalBoxLayout;
+class HorizontalOpacitySlider;
 class HorizontalSlider;
 class Icon;
 class IconView;
@@ -88,6 +89,7 @@ class TreeView;
 class ValueSlider;
 class Variant;
 class VerticalBoxLayout;
+class VerticalOpacitySlider;
 class VerticalSlider;
 class WMEvent;
 class Widget;

Userland/Libraries/LibGUI/OpacitySlider.cpp

@@ -10,7 +10,8 @@
 #include <LibGfx/Palette.h>
 #include <LibGfx/StylePainter.h>
 
-REGISTER_WIDGET(GUI, OpacitySlider)
+REGISTER_WIDGET(GUI, HorizontalOpacitySlider)
+REGISTER_WIDGET(GUI, VerticalOpacitySlider)
 
 namespace GUI {
 
@@ -20,7 +21,6 @@ OpacitySlider::OpacitySlider(Gfx::Orientation orientation)
     set_min(0);
     set_max(100);
     set_value(100);
-    set_fixed_height(20);
 }
 
 Gfx::IntRect OpacitySlider::frame_inner_rect() const
@@ -182,4 +182,20 @@ void OpacitySlider::mousewheel_event(MouseEvent& event)
     decrease_slider_by(event.wheel_delta_y());
 }
 
+Optional<UISize> OpacitySlider::calculated_min_size() const
+{
+    if (orientation() == Gfx::Orientation::Vertical)
+        return { { 20, 40 } };
+    else
+        return { { 40, 20 } };
+}
+
+Optional<UISize> OpacitySlider::calculated_preferred_size() const
+{
+    if (orientation() == Gfx::Orientation::Vertical)
+        return { { SpecialDimension::Shrink, SpecialDimension::OpportunisticGrow } };
+    else
+        return { { SpecialDimension::OpportunisticGrow, SpecialDimension::Shrink } };
+}
+
 }

Userland/Libraries/LibGUI/OpacitySlider.h

@@ -18,6 +18,8 @@ public:
     virtual ~OpacitySlider() override = default;
 
 protected:
+    explicit OpacitySlider(Gfx::Orientation);
+
     virtual void paint_event(PaintEvent&) override;
     virtual void mousedown_event(MouseEvent&) override;
     virtual void mousemove_event(MouseEvent&) override;
@@ -25,8 +27,6 @@ protected:
     virtual void mousewheel_event(MouseEvent&) override;
 
 private:
-    explicit OpacitySlider(Gfx::Orientation = Gfx::Orientation::Horizontal);
-
     Gfx::IntRect frame_inner_rect() const;
 
     virtual Optional<UISize> calculated_min_size() const override;
@@ -37,4 +37,30 @@ private:
     bool m_dragging { false };
 };
 
+class VerticalOpacitySlider final : public OpacitySlider {
+    C_OBJECT(VerticalOpacitySlider);
+
+public:
+    virtual ~VerticalOpacitySlider() override = default;
+
+private:
+    VerticalOpacitySlider()
+        : OpacitySlider(Orientation::Vertical)
+    {
+    }
+};
+
+class HorizontalOpacitySlider final : public OpacitySlider {
+    C_OBJECT(HorizontalOpacitySlider);
+
+public:
+    virtual ~HorizontalOpacitySlider() override = default;
+
+private:
+    HorizontalOpacitySlider()
+        : OpacitySlider(Orientation::Horizontal)
+    {
+    }
+};
+
 }