private HRESULT _RegisterThumbButtons()
{
var hr = HRESULT.S_OK;
if (!_haveAddedButtons)
{
var nativeButtons = new THUMBBUTTON[c_MaximumThumbButtons];
for (var i = 0; i < c_MaximumThumbButtons; ++i)
{
nativeButtons[i] = new THUMBBUTTON
{
iId = (uint)i,
dwFlags = THBF.NOBACKGROUND | THBF.DISABLED | THBF.HIDDEN,
dwMask = THB.FLAGS | THB.ICON | THB.TOOLTIP
};
}
hr = _taskbarList.ThumbBarAddButtons(_hwndSource.Handle, (uint)nativeButtons.Length, nativeButtons);
if (hr == HRESULT.E_INVALIDARG)
{
hr = HRESULT.S_FALSE;
}
_haveAddedButtons = hr.Succeeded;
}
return(hr);
}
private HRESULT _RegisterThumbButtons()
{
HRESULT hr = HRESULT.S_OK;
if (!_haveAddedButtons)
{
// The ITaskbarList3 API requires that the maximum number of buttons to ever be used
// are registered at the beginning. Modifications can be made to this list later.
var nativeButtons = new THUMBBUTTON[c_MaximumThumbButtons];
for (int i = 0; i < c_MaximumThumbButtons; ++i)
{
nativeButtons[i] = new THUMBBUTTON
{
iId = (uint)i,
dwFlags = THBF.NOBACKGROUND | THBF.DISABLED | THBF.HIDDEN,
dwMask = THB.FLAGS | THB.ICON | THB.TOOLTIP
};
}
// If this gets called (successfully) more than once it usually returns E_INVALIDARG. It's not really
// a failure and we potentially want to retry this operation.
hr = _taskbarList.ThumbBarAddButtons(_hwndSource.Handle, (uint)nativeButtons.Length, nativeButtons);
if (hr == HRESULT.E_INVALIDARG)
{
hr = HRESULT.S_FALSE;
}
_haveAddedButtons = hr.Succeeded;
}
return(hr);
}
