From 0a87eb7f746b39f0100a85cbb9dcf3a8d5c65e05 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Nusser?= <andre.nusser@googlemail.com>
Date: Mon, 17 Apr 2017 16:47:24 +0200
Subject: Introduce scrolling to Slider.

---
 plugingui/slider.cc | 52 ++++++++++++++++++++++------------------------------
 plugingui/slider.h  |  1 +
 2 files changed, 23 insertions(+), 30 deletions(-)

diff --git a/plugingui/slider.cc b/plugingui/slider.cc
index 6a764b8..7d5cdb4 100644
--- a/plugingui/slider.cc
+++ b/plugingui/slider.cc
@@ -104,16 +104,6 @@ void Slider::buttonEvent(ButtonEvent* buttonEvent)
 		state = State::down;
 		recomputeCurrentValue(buttonEvent->x);
 
-		if(current_value < 0)
-		{
-			current_value = 0;
-		}
-
-		if(current_value > 1)
-		{
-			current_value = 1;
-		}
-
 		redraw();
 		clickNotifier();
 	}
@@ -123,16 +113,6 @@ void Slider::buttonEvent(ButtonEvent* buttonEvent)
 		state = State::up;
 		recomputeCurrentValue(buttonEvent->x);
 
-		if(current_value < 0)
-		{
-			current_value = 0;
-		}
-
-		if(current_value > 1)
-		{
-			current_value = 1;
-		}
-
 		redraw();
 		clickNotifier();
 	}
@@ -144,21 +124,25 @@ void Slider::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent)
 	{
 		recomputeCurrentValue(mouseMoveEvent->x);
 
-		if(current_value < 0)
-		{
-			current_value = 0;
-		}
-
-		if(current_value > 1)
-		{
-			current_value = 1;
-		}
-
 		redraw();
 		clickNotifier();
 	}
 }
 
+void Slider::scrollEvent(ScrollEvent* scrollEvent)
+{
+	current_value += scrollEvent->delta/(float)getControlWidth();
+	if (current_value < 0.)
+	{
+		current_value = 0.;
+	}
+	else if (current_value > 1.0) {
+		current_value = 1.0;
+	}
+
+	redraw();
+}
+
 std::size_t Slider::getControlWidth() const
 {
 	if(width() < 2 * button_offset)
@@ -179,6 +163,14 @@ void Slider::recomputeCurrentValue(float x)
 	{
 		current_value = (maximum / getControlWidth()) * (x - button_offset);
 	}
+
+	if (current_value < 0.)
+	{
+		current_value = 0.;
+	}
+	else if (current_value > 1.0) {
+		current_value = 1.0;
+	}
 }
 
 } // GUI::
diff --git a/plugingui/slider.h b/plugingui/slider.h
index 9620fd0..ff2db29 100644
--- a/plugingui/slider.h
+++ b/plugingui/slider.h
@@ -63,6 +63,7 @@ protected:
 	virtual void repaintEvent(RepaintEvent* repaintEvent) override;
 	virtual void buttonEvent(ButtonEvent* buttonEvent) override;
 	virtual void mouseMoveEvent(MouseMoveEvent* mouseMoveEvent) override;
+	virtual void scrollEvent(ScrollEvent* scrollEvent) override;
 
 private:
 	enum class State
-- 
cgit v1.2.3