From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 6 Mar 2015 00:02:06 +0000 (+0200)
Subject: Implement mouse wheel scrolling in List
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=f0b600c3b1739f7e088da6ab8eb7c2e67adf592c

Implement mouse wheel scrolling in List
---

diff --git a/source/list.cpp b/source/list.cpp
index 10c5af8..f61d7c2 100644
--- a/source/list.cpp
+++ b/source/list.cpp
@@ -215,15 +215,32 @@ void List::render_special(const Part &part, GL::Renderer &renderer) const
 
 void List::button_press(int x, int y, unsigned btn)
 {
-	Container::button_press(x, y, btn);
-	if(click_focus && btn==1)
+	if(btn==4 || btn==5)
 	{
-		for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
-			if(click_focus==items[i])
-			{
-				set_selected_index(i);
-				break;
-			}
+		unsigned change = 3;
+		if(btn==4)
+		{
+			change = min(first, change);
+			slider.set_value(max_scroll-(first-change));
+		}
+		else if(btn==5)
+		{
+			change = min(max_scroll-first, change);
+			slider.set_value(max_scroll-(first+change));
+		}
+	}
+	else
+	{
+		Container::button_press(x, y, btn);
+		if(click_focus && btn==1)
+		{
+			for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
+				if(click_focus==items[i])
+				{
+					set_selected_index(i);
+					break;
+				}
+		}
 	}
 }