From 391a2f6747246acd31c95118d225651658d58bb6 Mon Sep 17 00:00:00 2001
From: "troy%netscape.com" <troy%netscape.com>
Date: Wed, 3 Feb 1999 04:25:31 +0000
Subject: [PATCH] Added GetScrollbarVisibility()

---
 view/public/nsIScrollableView.h | 7 +++++++
 view/src/nsScrollingView.cpp    | 8 ++++++++
 view/src/nsScrollingView.h      | 2 ++
 3 files changed, 17 insertions(+)

diff --git a/view/public/nsIScrollableView.h b/view/public/nsIScrollableView.h
index 917b9ce9c138..5e651ff268d8 100644
--- a/view/public/nsIScrollableView.h
+++ b/view/public/nsIScrollableView.h
@@ -139,6 +139,13 @@ public:
    */
   NS_IMETHOD GetControlInsets(nsMargin &aInsets) const = 0;
 
+  /**
+   * Get information about whether the vertical and horizontal scrollbars
+   * are currently visible
+   */
+  NS_IMETHOD GetScrollbarVisibility(PRBool *aVerticalVisible,
+                                    PRBool *aHorizontalVisible) const = 0;
+
 private:
   NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
   NS_IMETHOD_(nsrefcnt) Release(void) = 0;
diff --git a/view/src/nsScrollingView.cpp b/view/src/nsScrollingView.cpp
index 937fc1b4903a..49778ac4b399 100644
--- a/view/src/nsScrollingView.cpp
+++ b/view/src/nsScrollingView.cpp
@@ -1295,6 +1295,14 @@ NS_IMETHODIMP nsScrollingView :: GetControlInsets(nsMargin &aInsets) const
   return NS_OK;
 }
 
+NS_IMETHODIMP nsScrollingView :: GetScrollbarVisibility(PRBool *aVerticalVisible,
+                                                        PRBool *aHorizontalVisible) const
+{
+  *aVerticalVisible = mVScrollBarView && ViewIsShowing(mVScrollBarView);
+  *aHorizontalVisible = mHScrollBarView && ViewIsShowing(mHScrollBarView);
+  return NS_OK;
+}
+
 void nsScrollingView :: AdjustChildWidgets(nsScrollingView *aScrolling, nsIView *aView, nscoord aDx, nscoord aDy, float scale)
 {
   PRInt32           numkids;
diff --git a/view/src/nsScrollingView.h b/view/src/nsScrollingView.h
index 8ae8c67dfb7f..5282197684de 100644
--- a/view/src/nsScrollingView.h
+++ b/view/src/nsScrollingView.h
@@ -60,6 +60,8 @@ public:
   NS_IMETHOD  ScrollTo(nscoord aX, nscoord aY, PRUint32 aUpdateFlags);
   NS_IMETHOD  SetControlInsets(const nsMargin &aInsets);
   NS_IMETHOD  GetControlInsets(nsMargin &aInsets) const;
+  NS_IMETHOD  GetScrollbarVisibility(PRBool *aVerticalVisible,
+                                     PRBool *aHorizontalVisible) const;
 
   //private
   virtual void HandleScrollEvent(nsGUIEvent *aEvent, PRUint32 aEventFlags);