public TaskbarItemInfo()
{
if (!DesignerProperties.GetIsInDesignMode(this))
{
ITaskbarList taskbarList = null;
try
{
taskbarList = CLSID.CoCreateInstance <ITaskbarList>(CLSID.TaskbarList);
taskbarList.HrInit();
// This QI will only work on Win7.
_taskbarList = taskbarList as ITaskbarList3;
taskbarList = null;
}
finally
{
Utility.SafeRelease(ref taskbarList);
}
_overlaySize = new Size(
NativeMethods.GetSystemMetrics(SM.CXSMICON),
NativeMethods.GetSystemMetrics(SM.CYSMICON));
}
// Set ThumbButtons to an empty list so callers can just use the property.
ThumbButtonInfos = new ThumbButtonInfoCollection();
}
private HRESULT _UpdateThumbButtons(bool attached)
{
var nativeButtons = new THUMBBUTTON[c_MaximumThumbButtons];
HRESULT hr = _RegisterThumbButtons();
if (hr.Failed)
{
return(hr);
}
ThumbButtonInfoCollection thumbButtons = ThumbButtonInfos;
try
{
uint currentButton = 0;
if (attached && null != thumbButtons)
{
foreach (ThumbButtonInfo wrappedTB in thumbButtons)
{
var nativeTB = new THUMBBUTTON
{
iId = (uint)currentButton,
dwMask = THB.FLAGS | THB.TOOLTIP | THB.ICON,
};
switch (wrappedTB.Visibility)
{
case Visibility.Collapsed:
// HIDDEN removes the button from layout logic.
nativeTB.dwFlags = THBF.HIDDEN;
break;
case Visibility.Hidden:
// To match WPF's notion of hidden, we want this not HIDDEN,
// but disabled, without background, and without icon.
nativeTB.dwFlags = THBF.DISABLED | THBF.NOBACKGROUND;
nativeTB.hIcon = IntPtr.Zero;
break;
default:
case Visibility.Visible:
nativeTB.szTip = wrappedTB.Description ?? "";
nativeTB.hIcon = _GetHICONFromImageSource(wrappedTB.ImageSource, _overlaySize);
if (!wrappedTB.IsBackgroundVisible)
{
nativeTB.dwFlags |= THBF.NOBACKGROUND;
}
if (!wrappedTB.IsEnabled)
{
nativeTB.dwFlags |= THBF.DISABLED;
}
else
{
nativeTB.dwFlags |= THBF.ENABLED;
}
// This is separate from enabled/disabled
if (!wrappedTB.IsInteractive)
{
nativeTB.dwFlags |= THBF.NONINTERACTIVE;
}
if (wrappedTB.DismissWhenClicked)
{
nativeTB.dwFlags |= THBF.DISMISSONCLICK;
}
break;
}
nativeButtons[currentButton] = nativeTB;
++currentButton;
if (currentButton == c_MaximumThumbButtons)
{
break;
}
}
}
// If we're not attached, or the list is less than the maximum number of buttons
// then fill in the rest with collapsed, empty buttons.
for (; currentButton < c_MaximumThumbButtons; ++currentButton)
{
nativeButtons[currentButton] = new THUMBBUTTON
{
iId = (uint)currentButton,
dwFlags = THBF.NOBACKGROUND | THBF.DISABLED | THBF.HIDDEN,
dwMask = THB.FLAGS | THB.ICON | THB.TOOLTIP
};
}
// Finally, apply the update.
return(_taskbarList.ThumbBarUpdateButtons(_hwndSource.Handle, (uint)nativeButtons.Length, nativeButtons));
}
finally
{
foreach (var nativeButton in nativeButtons)
{
IntPtr hico = nativeButton.hIcon;
if (IntPtr.Zero != hico)
{
Utility.SafeDestroyIcon(ref hico);
}
}
}
}
