// ------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// Bounding rect of the pager control elements is calculated manually
static internal NativeMethods.Win32Rect BoundingRect(IntPtr hwnd, PagerItem item)
{
// rect for object
NativeMethods.Win32Rect itemrect = new NativeMethods.Win32Rect();
// size of button
int iButtonSize = Misc.ProxySendMessageInt(hwnd, NativeMethods.PGM_GETBUTTONSIZE, IntPtr.Zero, IntPtr.Zero);
// rect of entire pager this is used to get the calc for the button
NativeMethods.Win32Rect pagerRect = new NativeMethods.Win32Rect();
if (!Misc.GetWindowRect(hwnd, ref pagerRect))
{
return(NativeMethods.Win32Rect.Empty);
}
// does the control have vertical scrolling buttons
bool bHorz = WindowsPager.IsHorizontal(hwnd);
if (PagerItem.PrevBtn == item)
{
// Zero means invisible
if (!IsVisible(hwnd, NativeMethods.PGB_TOPORLEFT))
{
iButtonSize = 0;
}
itemrect.left = pagerRect.left;
itemrect.top = pagerRect.top;
if (bHorz)
{
itemrect.right = pagerRect.left + iButtonSize;
itemrect.bottom = pagerRect.bottom;
}
else
{
itemrect.right = pagerRect.right;
itemrect.bottom = pagerRect.top + iButtonSize;
}
}
else if (PagerItem.NextBtn == item)
{
if (!IsVisible(hwnd, NativeMethods.PGB_BOTTOMORRIGHT))
{
iButtonSize = 0;
}
itemrect.right = pagerRect.right;
itemrect.bottom = pagerRect.bottom;
if (bHorz)
{
itemrect.top = pagerRect.top;
itemrect.left = pagerRect.right - iButtonSize;
}
else
{
itemrect.left = pagerRect.left;
itemrect.top = pagerRect.bottom - iButtonSize;
}
}
return(itemrect);
}
// Same as a click on one of the buttons
void IInvokeProvider.Invoke()
{
// Make sure that the control is enabled
if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
{
throw new ElementNotEnabledException();
}
// Only if the button is visible
if (!IsVisible(_hwnd, _item == (int)WindowsPager.PagerItem.PrevBtn ? NativeMethods.PGB_TOPORLEFT : NativeMethods.PGB_BOTTOMORRIGHT))
{
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
// rect of entire pager this is used to get the calc for the button
NativeMethods.Win32Rect rcPager = new NativeMethods.Win32Rect();
if (!Misc.GetWindowRect(_hwnd, ref rcPager))
{
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
NativeMethods.Win32Rect rcButton = BoundingRect(_hwnd, (PagerItem)_item);
// does the control have vertical scrolling buttons
bool bHorz = WindowsPager.IsHorizontal(_hwnd);
// Compute the metrics for both the button and the pager
int cxButton = rcButton.right - rcButton.left;
int cyButton = rcButton.bottom - rcButton.top;
int x, y;
// Calc the x and y position for the mouse
if (_item == (int)PagerItem.PrevBtn)
{
x = (bHorz ? -cxButton : cxButton) / 2;
y = (bHorz ? cyButton : -cyButton) / 2;
}
else
{
int cHalfButtons = IsVisible(_hwnd, _item == (int)WindowsPager.PagerItem.PrevBtn ? NativeMethods.PGB_BOTTOMORRIGHT : NativeMethods.PGB_TOPORLEFT) ? -1 : 1;
x = bHorz ? rcButton.left - rcPager.left + cHalfButtons * cxButton / 2 : cxButton / 2;
y = bHorz ? cyButton / 2 : rcButton.top - rcPager.top + cHalfButtons * cyButton / 2;
}
// Fake a mouse click
IntPtr center = NativeMethods.Util.MAKELPARAM(x, y);
NativeMethods.Win32Rect rcChild = new NativeMethods.Win32Rect();
int cRange = ((WindowsPager)_parent).ScrollRange(ref rcChild);
int iPrevPos = Misc.ProxySendMessageInt(_hwnd, NativeMethods.PGM_GETPOS, IntPtr.Zero, IntPtr.Zero);
// Sometimes the Invoke fails. Try 3 times when this happens
for (int i = 0; i < 3; i++)
{
Misc.ProxySendMessage(_hwnd, NativeMethods.WM_LBUTTONDOWN, new IntPtr(NativeMethods.MK_LBUTTON), center);
// !!! The pager control will only take into account the Down/Up mouse action if the delta
// time between the 2 is at least the doubleClickTime / 8
System.Threading.Thread.Sleep(SafeNativeMethods.GetDoubleClickTime() / 4);
Misc.ProxySendMessage(_hwnd, NativeMethods.WM_LBUTTONUP, new IntPtr(NativeMethods.MK_LBUTTON), center);
// Sanity check
if ((iPrevPos == 0 && _item == (int)PagerItem.PrevBtn) ||
(iPrevPos >= cRange && _item == (int)PagerItem.NextBtn) ||
Misc.ProxySendMessageInt(_hwnd, NativeMethods.PGM_GETPOS, IntPtr.Zero, IntPtr.Zero) != iPrevPos)
{
break;
}
}
}