// Callback from VolumeDetector
public void AudioChanged(DeviceInfo info)
{
// Windows7 sometimes triggers callback when volume hasn't changed.
if (lastInfo != null)
{
if (info.Muted == lastInfo.Muted && info.Volume == lastInfo.Volume )
return;
}
lastInfo = info;
try
{
this.Opacity = settings.Opacity + _Opacity;
if (this.Visible == false)
this.Visible = true; // throw in preview
// Manually draw the image to get the transparency
string image = ResolveImage(info, settings, BasePath);
System.Drawing.Image actualImage = System.Drawing.Image.FromFile(image);
ImageAttributes attr = new ImageAttributes();
Rectangle dstRect = new Rectangle(0, 0, actualImage.Width, actualImage.Height);
CreateGraphics().DrawImage(actualImage, dstRect, 0, 0, actualImage.Width, actualImage.Height,
GraphicsUnit.Pixel, attr);
System.Threading.Thread t = new System.Threading.Thread(new ThreadStart(WaitAndHide));
lastMove = System.DateTime.Now;
t.Start();
}
catch (ObjectDisposedException)
{
// In preview we recieved a callback from an item that we cannot
// access
return;
}
}
// Resolve the image that the device info corresponds to
private string ResolveImage(DeviceInfo info, DisplaySettings settings, string basePath)
{
if (info.Muted)
return basePath + settings.Images[0].ImageName;
int images = settings.Images.Count;
images--; // take into account the mute item
double interval = (double)1 / (double)images;
double estimatedItem = info.Volume / interval;
int imageNumber = System.Convert.ToInt32(System.Math.Round(estimatedItem));
return basePath + settings.Images[System.Math.Min(images, imageNumber + 1)].ImageName;
}