async void SetBackgroundImageAsync(string imageId, Panel control, PositionLength horizontal, PositionLength vertical)
{
byte[] imgBytes = null;
if (imageId.StartsWith("#"))
{
var img = CaptionRegion.TunneledData[imageId.Substring(1)];
if (img != null && img.Encoding == "Base64")
{
imgBytes = System.Convert.FromBase64String(img.Data);
}
}
else
{
using (var httpClient = new HttpClient())
{
imgBytes = await httpClient.GetByteArrayAsync(imageId);
}
}
if (imgBytes != null)
{
await SetBackgroundImageBytesAsync(imgBytes, control, horizontal, vertical);
}
}
static async Task SetBackgroundImageBytesAsync(byte[] imageBytes, Panel control, PositionLength horizontal, PositionLength vertical)
{
var bmpImage = await ByteArrayToImageAsync(imageBytes);
var imageBrush = new ImageBrush() { ImageSource = bmpImage, Stretch = Stretch.None };
if (horizontal != null)
{
switch (horizontal.Unit)
{
case PositionLengthUnit.CenterAlign:
imageBrush.AlignmentX = AlignmentX.Center;
break;
case PositionLengthUnit.NearAlign:
imageBrush.AlignmentX = AlignmentX.Left;
break;
case PositionLengthUnit.FarAlign:
imageBrush.AlignmentX = AlignmentX.Right;
break;
case PositionLengthUnit.Absolute:
imageBrush.AlignmentX = AlignmentX.Left;
imageBrush.Transform = new TranslateTransform() { X = horizontal.Value };
break;
case PositionLengthUnit.Percentage:
imageBrush.AlignmentX = AlignmentX.Left;
imageBrush.RelativeTransform = new TranslateTransform() { X = horizontal.Value };
break;
}
}
if (vertical != null)
{
switch (vertical.Unit)
{
case PositionLengthUnit.CenterAlign:
imageBrush.AlignmentY = AlignmentY.Center;
break;
case PositionLengthUnit.NearAlign:
imageBrush.AlignmentY = AlignmentY.Top;
break;
case PositionLengthUnit.FarAlign:
imageBrush.AlignmentY = AlignmentY.Bottom;
break;
case PositionLengthUnit.Absolute:
imageBrush.AlignmentY = AlignmentY.Top;
var transform = imageBrush.Transform as TranslateTransform;
if (transform == null)
{
transform = new TranslateTransform();
imageBrush.Transform = transform;
}
transform.Y = vertical.Value;
break;
case PositionLengthUnit.Percentage:
imageBrush.AlignmentY = AlignmentY.Top;
var relativeTransform = imageBrush.RelativeTransform as TranslateTransform;
if (relativeTransform == null)
{
relativeTransform = new TranslateTransform();
imageBrush.RelativeTransform = relativeTransform;
}
relativeTransform.Y = vertical.Value;
break;
}
}
control.Background = imageBrush;
}
async void SetBackgroundImageAsync(string imageId, Panel control, PositionLength horizontal, PositionLength vertical)
{
byte[] imgBytes = null;
if (imageId.StartsWith("#"))
{
var img = CaptionRegion.TunneledData[imageId.Substring(1)];
if (img != null && img.Encoding == "Base64")
{
imgBytes = System.Convert.FromBase64String(img.Data);
}
}
else
{
using (var httpClient = new HttpClient())
{
imgBytes = await httpClient.GetByteArrayAsync(imageId);
}
}
if (imgBytes != null)
{
await SetBackgroundImageBytesAsync(imgBytes, control, horizontal, vertical);
}
}
static async Task SetBackgroundImageBytesAsync(byte[] imageBytes, Panel control, PositionLength horizontal, PositionLength vertical)
{
var bmpImage = await ByteArrayToImageAsync(imageBytes);
var imageBrush = new ImageBrush()
{
ImageSource = bmpImage, Stretch = Stretch.None
};
if (horizontal != null)
{
switch (horizontal.Unit)
{
case PositionLengthUnit.CenterAlign:
imageBrush.AlignmentX = AlignmentX.Center;
break;
case PositionLengthUnit.NearAlign:
imageBrush.AlignmentX = AlignmentX.Left;
break;
case PositionLengthUnit.FarAlign:
imageBrush.AlignmentX = AlignmentX.Right;
break;
case PositionLengthUnit.Absolute:
imageBrush.AlignmentX = AlignmentX.Left;
imageBrush.Transform = new TranslateTransform()
{
X = horizontal.Value
};
break;
case PositionLengthUnit.Percentage:
imageBrush.AlignmentX = AlignmentX.Left;
imageBrush.RelativeTransform = new TranslateTransform()
{
X = horizontal.Value
};
break;
}
}
if (vertical != null)
{
switch (vertical.Unit)
{
case PositionLengthUnit.CenterAlign:
imageBrush.AlignmentY = AlignmentY.Center;
break;
case PositionLengthUnit.NearAlign:
imageBrush.AlignmentY = AlignmentY.Top;
break;
case PositionLengthUnit.FarAlign:
imageBrush.AlignmentY = AlignmentY.Bottom;
break;
case PositionLengthUnit.Absolute:
imageBrush.AlignmentY = AlignmentY.Top;
var transform = imageBrush.Transform as TranslateTransform;
if (transform == null)
{
transform = new TranslateTransform();
imageBrush.Transform = transform;
}
transform.Y = vertical.Value;
break;
case PositionLengthUnit.Percentage:
imageBrush.AlignmentY = AlignmentY.Top;
var relativeTransform = imageBrush.RelativeTransform as TranslateTransform;
if (relativeTransform == null)
{
relativeTransform = new TranslateTransform();
imageBrush.RelativeTransform = relativeTransform;
}
relativeTransform.Y = vertical.Value;
break;
}
}
control.Background = imageBrush;
}