From 629b350a71c10b7675a70226d0ead657258f5cb6 Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Thu, 12 Aug 2010 06:40:28 +0000
Subject: (svn r20451) -Codechange: Add helper function Window::GetScrollbar()
 to get the Scrollbar belonging to a scrollbar widget.

---
 src/window.cpp | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'src/window.cpp')

diff --git a/src/window.cpp b/src/window.cpp
index 3081bc268..a002de09b 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -130,6 +130,39 @@ void Scrollbar::SetCapacityFromWidget(Window *w, int widget, int padding)
 	}
 }
 
+/**
+ * Return the Scrollbar to a widget index.
+ * @param widnum Scrollbar widget index
+ * @return Scrollbar to the widget
+ */
+const Scrollbar *Window::GetScrollbar(uint widnum) const
+{
+	const NWidgetLeaf *wid = this->GetWidget<NWidgetLeaf>(widnum);
+	switch (wid->type) {
+		case WWT_HSCROLLBAR: return &this->hscroll;
+		case WWT_SCROLLBAR:  return &this->vscroll;
+		case WWT_SCROLL2BAR: return &this->vscroll2;
+		default: NOT_REACHED();
+	}
+}
+
+/**
+ * Return the Scrollbar to a widget index.
+ * @param widnum Scrollbar widget index
+ * @return Scrollbar to the widget
+ */
+Scrollbar *Window::GetScrollbar(uint widnum)
+{
+	NWidgetLeaf *wid = this->GetWidget<NWidgetLeaf>(widnum);
+	switch (wid->type) {
+		case WWT_HSCROLLBAR: return &this->hscroll;
+		case WWT_SCROLLBAR:  return &this->vscroll;
+		case WWT_SCROLL2BAR: return &this->vscroll2;
+		default: NOT_REACHED();
+	}
+}
+
+
 /**
  * Set the window that has the focus
  * @param w The window to set the focus on
-- 
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