/// <summary>
/// Sets image source and size (by scale factor)
/// </summary>
/// <param name="scale">If > 0, scales the image by the specified amount, otherwise uses source image dimensions</param>
/// <param name="exception">Is set to the Exception instance if image couldn't be loaded, otherwise null</param>
/// <returns>Returns true if image was succesfully loaded, otherwise false</returns>
public bool TrySet(string imageUrl, double scale, out Exception exception)
{
exception = null;
try
{
//TODO [!]: Currently, this loading system prevents images from being changed on disk, fix this
// e.g. using http://stackoverflow.com/questions/1763608/display-an-image-in-wpf-without-holding-the-file-open
Uri uri = new Uri(_variableExpander.ProcessText(imageUrl), UriKind.Absolute);
if (uri.Scheme == "data")
{
this.Source = BitmapFrame.Create(DataUriLoader.Load(uri));
}
else
{
this.Source = BitmapFrame.Create(uri);
}
this.Url = imageUrl;
}
catch (Exception ex)
{
exception = ex;
return(false);
}
this.Scale = scale;
return(true);
}
private bool LoadFromUri(string rawUri, string sourceFileDir, Action refreshAction, out string errorString)
{
if (string.IsNullOrWhiteSpace(rawUri))
{
Source = null;
errorString = "No image specified";
return(false);
}
var expandedUrl = _variableExpander.ProcessText(rawUri);
if (!File.Exists(expandedUrl)) //TODO: Refactor this eg. post processing step
{
// if the file does not exists, but we have an existing "docfx.json", lets try to find file in "$(ProjectDir)\images" directory
var jsonFile = _variableExpander.ProcessText("$(ProjectDir)\\docfx.json");
if (File.Exists(jsonFile))
{
// Example: we replace in "..\\images\picture.png" all the ".." with "$ProjectDir" --> "$ProjectDir\\images\\picture.png"
expandedUrl = rawUri.Replace("..", "$(ProjectDir)");
expandedUrl = _variableExpander.ProcessText(expandedUrl);
}
}
var success = Uri.TryCreate(_variableExpander.ProcessText(expandedUrl), UriKind.Absolute, out var uri);
var canLoadData = success && DataUriLoader.CanLoad(uri);
var canLoadFromWeb = success && WebLoader.CanLoad(uri);
if (canLoadData)
{
//TODO [!]: Currently, this loading system prevents images from being changed on disk, fix this
// e.g. using http://stackoverflow.com/questions/1763608/display-an-image-in-wpf-without-holding-the-file-open
Source = Load(DataUriLoader.Load(uri), uri);
}
else if (canLoadFromWeb)
{
expandedUrl = WebLoader.Load(uri);
}
else if (!success && !Path.IsPathRooted(expandedUrl) && sourceFileDir != null)
{
expandedUrl = Path.Combine(sourceFileDir, expandedUrl);
expandedUrl = Path.GetFullPath((new Uri(expandedUrl)).LocalPath);
}
if (!canLoadData && File.Exists(expandedUrl))
{
var data = new MemoryStream(File.ReadAllBytes(expandedUrl));
Source = Load(data, new Uri(expandedUrl));
// Create file system watcher to update changed image file.
_watcher = new FileSystemWatcher
{
//NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName | NotifyFilters.Size,
Path = Path.GetDirectoryName(expandedUrl),
Filter = Path.GetFileName(expandedUrl)
};
var w = _watcher;
void Refresh(object sender, FileSystemEventArgs e)
{
try
{
var enableRaisingEvents = w.EnableRaisingEvents;
w.EnableRaisingEvents = false;
if (!enableRaisingEvents)
{
return;
}
Attributes.Url = null;
refreshAction();
}
catch
{
// ignored
}
}
_watcher.Changed += Refresh;
_watcher.Renamed += Refresh;
_watcher.Deleted += Refresh;
_watcher.EnableRaisingEvents = true;
errorString = null;
return(true);
}
Source = null;
errorString = $"Could not load image '{uri}' (resolved to '{expandedUrl}')";
return(false);
}
/// <summary>
/// Sets image source and size (by scale factor)
/// </summary>
/// <param name="scale">If > 0, scales the image by the specified amount, otherwise uses source image dimensions</param>
/// <param name="exception">Is set to the Exception instance if image couldn't be loaded, otherwise null</param>
/// <returns>Returns true if image was successfully loaded, otherwise false</returns>
public bool TrySet(string imageUrl, double scale, Color bgColor, out Exception exception, Action refreshAction)
{
// Remove old watcher.
var watcher = _watcher;
_watcher = null;
if (watcher != null)
{
watcher.Dispose();
}
// ---
exception = null;
try
{
var expandedUrl = _variableExpander.ProcessText(imageUrl);
if (File.Exists(expandedUrl))
{
var data = new MemoryStream(File.ReadAllBytes(expandedUrl));
Source = BitmapFrame.Create(data);
// Create file system watcher to update changed image file.
_watcher = new FileSystemWatcher
{
//NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName | NotifyFilters.Size,
Path = Path.GetDirectoryName(expandedUrl),
Filter = Path.GetFileName(expandedUrl)
};
var w = _watcher;
FileSystemEventHandler refresh = delegate
{
try
{
var enableRaisingEvents = w.EnableRaisingEvents;
w.EnableRaisingEvents = false;
if (enableRaisingEvents)
{
Url = null;
refreshAction();
}
}
catch { }
};
_watcher.Changed += refresh;
_watcher.Renamed += (s, a) => refresh(s, a);
_watcher.Deleted += refresh;
_watcher.EnableRaisingEvents = true;
}
else
{
//TODO [!]: Currently, this loading system prevents images from being changed on disk, fix this
// e.g. using http://stackoverflow.com/questions/1763608/display-an-image-in-wpf-without-holding-the-file-open
Uri uri = new Uri(_variableExpander.ProcessText(expandedUrl), UriKind.Absolute);
if (uri.Scheme == "data")
{
Source = BitmapFrame.Create(DataUriLoader.Load(uri));
}
else
{
Source = BitmapFrame.Create(uri);
}
}
if (bgColor.A != 0)
{
Source = ReplaceTransparency(Source, bgColor);
BgColor = bgColor;
}
Url = imageUrl;
}
catch (Exception ex)
{
exception = ex;
return(false);
}
this.Scale = scale;
return(true);
}
