/// <include file='doc\ErrorProvider.uex' path='docs/doc[@for="ErrorProvider.DisposeRegion"]/*' />
/// <devdoc>
/// Helper to dispose the cached icon region.
/// </devdoc>
/// <internalonly/>
void DisposeRegion() {
if (region != null) {
region.Dispose();
region = null;
}
}
public unsafe void Update(bool timerCaused)
{
IconRegion iconRegion = _provider.Region;
Size size = iconRegion.Size;
_windowBounds = Rectangle.Empty;
for (int i = 0; i < _items.Count; i++)
{
ControlItem item = _items[i];
Rectangle iconBounds = item.GetIconBounds(size);
if (_windowBounds.IsEmpty)
{
_windowBounds = iconBounds;
}
else
{
_windowBounds = Rectangle.Union(_windowBounds, iconBounds);
}
}
using var windowRegion = new Region(new Rectangle(0, 0, 0, 0));
for (int i = 0; i < _items.Count; i++)
{
ControlItem item = _items[i];
Rectangle iconBounds = item.GetIconBounds(size);
iconBounds.X -= _windowBounds.X;
iconBounds.Y -= _windowBounds.Y;
bool showIcon = true;
if (!item.ToolTipShown)
{
switch (_provider.BlinkStyle)
{
case ErrorBlinkStyle.NeverBlink:
// always show icon
break;
case ErrorBlinkStyle.BlinkIfDifferentError:
showIcon = (item.BlinkPhase == 0) || (item.BlinkPhase > 0 && (item.BlinkPhase & 1) == (i & 1));
break;
case ErrorBlinkStyle.AlwaysBlink:
showIcon = ((i & 1) == 0) == _provider._showIcon;
break;
}
}
if (showIcon)
{
iconRegion.Region.Translate(iconBounds.X, iconBounds.Y);
windowRegion.Union(iconRegion.Region);
iconRegion.Region.Translate(-iconBounds.X, -iconBounds.Y);
}
if (_tipWindow is not null)
{
ComCtl32.TTF flags = ComCtl32.TTF.SUBCLASS;
if (_provider.RightToLeft)
{
flags |= ComCtl32.TTF.RTLREADING;
}
var toolInfo = new ComCtl32.ToolInfoWrapper <ErrorWindow>(this, item.Id, flags, item.Error, iconBounds);
toolInfo.SendMessage(_tipWindow, (User32.WM)ComCtl32.TTM.SETTOOLINFOW);
}
if (timerCaused && item.BlinkPhase > 0)
{
item.BlinkPhase--;
}
}
if (timerCaused)
{
_provider._showIcon = !_provider._showIcon;
}
using var hdc = new User32.GetDcScope(Handle);
using var save = new Gdi32.SaveDcScope(hdc);
MirrorDcIfNeeded(hdc);
using Graphics g = hdc.CreateGraphics();
using var windowRegionHandle = new Gdi32.RegionScope(windowRegion, g);
if (User32.SetWindowRgn(this, windowRegionHandle, BOOL.TRUE) != 0)
{
// The HWnd owns the region.
windowRegionHandle.RelinquishOwnership();
}
User32.SetWindowPos(
new HandleRef(this, Handle),
User32.HWND_TOP,
_windowBounds.X,
_windowBounds.Y,
_windowBounds.Width,
_windowBounds.Height,
User32.SWP.NOACTIVATE);
User32.InvalidateRect(new HandleRef(this, Handle), null, BOOL.FALSE);
}
private void DisposeRegion()
{
if (this.region != null)
{
this.region.Dispose();
this.region = null;
}
}