private bool IsEnabled()
{
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo();
sbi.cbSize = Marshal.SizeOf(sbi.GetType());
int idObject = NativeMethods.OBJID_CLIENT;
if (_sbFlag == NativeMethods.SB_VERT)
{
idObject = NativeMethods.OBJID_VSCROLL;
}
else if (_sbFlag == NativeMethods.SB_HORZ)
{
idObject = NativeMethods.OBJID_HSCROLL;
}
if (!Misc.GetScrollBarInfo(_hwnd, idObject, ref sbi))
{
return false;
}
return !Misc.IsBitSet(sbi.scrollBarInfo, NativeMethods.STATE_SYSTEM_UNAVAILABLE);
}
// ------------------------------------------------------
//
// Private Methods
//
// ------------------------------------------------------
#region Private Methods
// Create a new proxy for one of the scroll bit items
private ProxySimple CreateScrollBitsItem (ScrollBarItem index)
{
// For Scrollbars as standalone controls, make sure that the buttons are not invisible. (office scroll bars)
// Checking is done from the return value of SetScrolBarInfo.
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo ();
sbi.cbSize = Marshal.SizeOf (sbi.GetType ());
if (_sbFlag != NativeMethods.SB_CTL || Misc.GetScrollBarInfo(_hwnd, NativeMethods.OBJID_CLIENT, ref sbi))
{
return new WindowsScrollBarBits (_hwnd, this, (int) index, _sbFlag);
}
return null;
}
// Check if a scroll bar implements the Value Pattern
private static bool HasValuePattern (IntPtr hwnd, int sbFlag)
{
// The scroll bar is enabled, check if we have a thumb
int idObject = sbFlag == NativeMethods.SB_VERT ? NativeMethods.OBJID_VSCROLL : sbFlag == NativeMethods.SB_HORZ ? NativeMethods.OBJID_HSCROLL : NativeMethods.OBJID_CLIENT;
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo ();
sbi.cbSize = Marshal.SizeOf (sbi.GetType ());
// Scroll bars implements the Value pattern if
// 1) they are owner drawn (in which case GetScrollBarInfo fails)
// 2) they have a thumb (not completely squished)
if (Misc.GetScrollBarInfo(hwnd, idObject, ref sbi))
{
return IsScrollBarWithThumb (hwnd, sbFlag);
}
return true;
}
// Check if a scroll bar is in a disabled state
internal static bool IsScrollBarWithThumb (IntPtr hwnd, int sbFlag)
{
NativeMethods.ScrollInfo si = new NativeMethods.ScrollInfo ();
si.cbSize = Marshal.SizeOf (si.GetType ());
si.fMask = NativeMethods.SIF_RANGE | NativeMethods.SIF_PAGE;
if (!Misc.GetScrollInfo(hwnd, sbFlag, ref si))
{
return false;
}
// Check for the min / max value
if (si.nMax != si.nMin && si.nPage != si.nMax - si.nMin + 1)
{
// The scroll bar is enabled, check if we have a thumb
int idObject = sbFlag == NativeMethods.SB_VERT ? NativeMethods.OBJID_VSCROLL : sbFlag == NativeMethods.SB_HORZ ? NativeMethods.OBJID_HSCROLL : NativeMethods.OBJID_CLIENT;
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo ();
sbi.cbSize = Marshal.SizeOf (sbi.GetType ());
// check that the 2 buttons can hold in the scroll bar
if (Misc.GetScrollBarInfo(hwnd, idObject, ref sbi))
{
// When the scroll bar is for a listbox within a combo and it is hidden, then
// GetScrollBarInfo returns true but the rectangle is boggus!
// 32 bits * 32 bits > 64 values
long area = (sbi.rcScrollBar.right - sbi.rcScrollBar.left) * (sbi.rcScrollBar.bottom - sbi.rcScrollBar.top);
if (area > 0 && area < 1000 * 1000)
{
NativeMethods.SIZE sizeArrow;
using (ThemePart themePart = new ThemePart(hwnd, "SCROLLBAR"))
{
sizeArrow = themePart.Size((int)ThemePart.SCROLLBARPARTS.SBP_ARROWBTN, 0);
}
bool fThumbVisible = false;
if (IsScrollBarVertical(hwnd, sbFlag))
{
fThumbVisible = (sbi.rcScrollBar.bottom - sbi.rcScrollBar.top >= 5 * sizeArrow.cy / 2);
}
else
{
fThumbVisible = (sbi.rcScrollBar.right - sbi.rcScrollBar.left >= 5 * sizeArrow.cx / 2);
}
return fThumbVisible;
}
}
}
return false;
}
// ------------------------------------------------------
//
// Internal Methods
//
// ------------------------------------------------------
#region Internal Methods
// Static implementation for the bounding rectangle. This is used by
// ElementProviderFromPoint to avoid to have to create for a simple
// boundary check
// param "item", ID for the scrollbar bit
// param "sbFlag", SBS_ WindowLong equivallent flag
static internal Rect GetBoundingRectangle(IntPtr hwnd, ProxyFragment parent, WindowsScrollBar.ScrollBarItem item, int sbFlag)
{
NativeMethods.ScrollInfo si = new NativeMethods.ScrollInfo ();
si.cbSize = Marshal.SizeOf (si.GetType ());
si.fMask = NativeMethods.SIF_RANGE;
// If the scroll bar is disabled, we cannot have a thumb and large Increment/Decrement)
bool fDisableScrollBar = !WindowsScrollBar.IsScrollBarWithThumb (hwnd, sbFlag);
if (fDisableScrollBar && (item == WindowsScrollBar.ScrollBarItem.LargeDecrement || item == WindowsScrollBar.ScrollBarItem.Thumb || item == WindowsScrollBar.ScrollBarItem.LargeDecrement))
{
return Rect.Empty;
}
// If fails assume that the hwnd is invalid
if (!Misc.GetScrollInfo(hwnd, sbFlag, ref si))
{
return Rect.Empty;
}
int idObject = sbFlag == NativeMethods.SB_VERT ? NativeMethods.OBJID_VSCROLL : sbFlag == NativeMethods.SB_HORZ ? NativeMethods.OBJID_HSCROLL : NativeMethods.OBJID_CLIENT;
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo ();
sbi.cbSize = Marshal.SizeOf (sbi.GetType ());
if (!Misc.GetScrollBarInfo(hwnd, idObject, ref sbi))
{
return Rect.Empty;
}
if (parent != null && parent._parent != null)
{
//
// Builds prior to Vista 5359 failed to correctly account for RTL scrollbar layouts.
//
if ((Environment.OSVersion.Version.Major < 6) && (Misc.IsLayoutRTL(parent._parent._hwnd)))
{
// Right to left mirroring style
Rect rcParent = parent._parent.BoundingRectangle;
int width = sbi.rcScrollBar.right - sbi.rcScrollBar.left;
if (sbFlag == NativeMethods.SB_VERT)
{
int offset = (int)rcParent.Right - sbi.rcScrollBar.right;
sbi.rcScrollBar.left = (int)rcParent.Left + offset;
sbi.rcScrollBar.right = sbi.rcScrollBar.left + width;
}
else
{
int offset = sbi.rcScrollBar.left - (int)rcParent.Left;
sbi.rcScrollBar.right = (int)rcParent.Right - offset;
sbi.rcScrollBar.left = sbi.rcScrollBar.right - width;
}
}
}
// When the scroll bar is for a listbox within a combo and it is hidden, then
// GetScrollBarInfo returns true but the rectangle is boggus!
// 32 bits * 32 bits > 64 values
//
// Note that this test must come after the rectangle has been normalized for RTL or it will fail
//
long area = (sbi.rcScrollBar.right - sbi.rcScrollBar.left) * (sbi.rcScrollBar.bottom - sbi.rcScrollBar.top);
if (area <= 0 || area > 1000 * 1000)
{
// Ridiculous value assume error
return Rect.Empty;
}
if(WindowsScrollBar.IsScrollBarVertical(hwnd, sbFlag))
{
return GetVerticalScrollbarBitBoundingRectangle(hwnd, item, sbi);
}
else
{
return GetHorizontalScrollbarBitBoundingRectangle(hwnd, item, sbi);
}
}
private bool SetScrollPercent(double fScrollPos, int sbFlag, int cPelsAll, out int delta)
{
// in case of early exit no move
delta = 0;
// Check param
if ((int)fScrollPos == (int)ScrollPattern.NoScroll)
{
return true;
}
if (fScrollPos < 0 || fScrollPos > 100)
{
throw new ArgumentOutOfRangeException(sbFlag == NativeMethods.SB_HORZ ? "horizontalPercent" : "verticalPercent", SR.Get(SRID.ScrollBarOutOfRange));
}
int scrollBar = sbFlag == NativeMethods.SB_HORZ ? NativeMethods.OBJID_HSCROLL : NativeMethods.OBJID_VSCROLL;
NativeMethods.ScrollBarInfo scrollBarInfo = new NativeMethods.ScrollBarInfo();
scrollBarInfo.cbSize = Marshal.SizeOf(scrollBarInfo.GetType());
if (!Misc.GetScrollBarInfo(_hwnd, scrollBar, ref scrollBarInfo) ||
(scrollBarInfo.scrollBarInfo & NativeMethods.STATE_SYSTEM_INVISIBLE) != 0 ||
(scrollBarInfo.scrollBarInfo & NativeMethods.STATE_SYSTEM_UNAVAILABLE) != 0)
{
return false;
}
// Get scroll range
NativeMethods.ScrollInfo si = new NativeMethods.ScrollInfo (); // this is used all over
si.cbSize = Marshal.SizeOf (si.GetType ());
si.fMask = NativeMethods.SIF_ALL;
// if no scroll bar return false
// on Win 6.0 success is false
// on other system check through the scroll info is a scroll bar is there
if (!Misc.GetScrollInfo(_hwnd, sbFlag, ref si) ||
!((si.nMax != si.nMin && si.nPage != si.nMax - si.nMin + 1)))
{
return false;
}
// calculate user-requested thumb position
int deltaPage = (si.nPage > 0) ? si.nPage - 1 : 0;
int future = (int) Math.Round (((si.nMax - deltaPage) - si.nMin) * fScrollPos / 100.0 + si.nMin);
// delta between current and user-requested position in pixels
// since the cPelsAll contains the dimension in pels for all items + the 2 pels of the border
// the operation below does a trunc on purpose
delta = (future - si.nPos) * (cPelsAll / (si.nMax + 1 - si.nMin));
return true;
}
// get rect of the v-scrollbar
private NativeMethods.Win32Rect GetScrollbarRect()
{
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo ();
sbi.cbSize = Marshal.SizeOf(sbi.GetType());
if (Misc.GetScrollBarInfo(_hwnd, NativeMethods.OBJID_VSCROLL, ref sbi))
{
return new NativeMethods.Win32Rect(sbi.rcScrollBar.left, sbi.rcScrollBar.top, sbi.rcScrollBar.right, sbi.rcScrollBar.bottom);
}
return NativeMethods.Win32Rect.Empty;
}
// Finds if a control can be scrolled
static internal bool Scrollable (IntPtr hwnd, int sbFlag)
{
int style = Misc.GetWindowStyle(hwnd);
if ((sbFlag == NativeMethods.SB_HORZ && !Misc.IsBitSet(style, NativeMethods.WS_HSCROLL)) ||
(sbFlag == NativeMethods.SB_VERT && !Misc.IsBitSet(style, NativeMethods.WS_VSCROLL)))
{
return false;
}
if (!Misc.IsEnabled(hwnd))
{
return false;
}
// Check if the scroll info shows the scroll bar as enabled.
bool scrollBarEnabled = false;
NativeMethods.ScrollBarInfo sbi = new NativeMethods.ScrollBarInfo();
sbi.cbSize = Marshal.SizeOf(sbi.GetType());
int scrollBarObjectId =
(sbFlag == NativeMethods.SB_VERT) ? NativeMethods.OBJID_VSCROLL : NativeMethods.OBJID_HSCROLL;
if (Misc.GetScrollBarInfo(hwnd, scrollBarObjectId, ref sbi))
{
scrollBarEnabled =
!Misc.IsBitSet(sbi.scrollBarInfo, NativeMethods.STATE_SYSTEM_UNAVAILABLE);
}
if (!scrollBarEnabled)
{
return false;
}
// Get scroll range
NativeMethods.ScrollInfo si = new NativeMethods.ScrollInfo ();
si.cbSize = Marshal.SizeOf (si.GetType ());
si.fMask = NativeMethods.SIF_ALL;
if (!Misc.GetScrollInfo(hwnd, sbFlag, ref si))
{
return false;
}
return (si.nMax != si.nMin && si.nPage != si.nMax - si.nMin + 1);
}
