/// <summary>
/// Creates a header with four (4) tabs
/// </summary>
public HeaderRenderControl(Font font, LogoDetails logo, TabDetails tab1, TabDetails tab2, TabDetails tab3, TabDetails tab4)
{
this._SetupHeaderControl(font, logo, new TabDetails[] { tab1, tab2, tab3, tab4 });
}
/// <summary>
/// Renders and saves a tab to the tab storage directory
/// </summary>
private void _RenderTab(TabDetails tab, string path, int index, bool isLastTab)
{
//determine the correct path to this tab
string templateTabPath = HttpContext.Current.Server.MapPath(
string.Concat(
HeaderRenderControl.TEMPLATE_TAB_PATH_AND_PREFIX,
(index + 1),
(isLastTab ? HeaderRenderControl.TAB_LAST_POSTFIX : string.Empty),
HeaderRenderControl.TAB_FILE_TYPE
));
//make sure the image is available
if (!File.Exists(templateTabPath)) {
throw new FileNotFoundException(
string.Format(
HeaderRenderControl.EXCEPTION_TEMPLATE_IMAGE_MISSING,
templateTabPath
));
}
//load the image and the coordinates for this the text
Image template = Image.FromFile(templateTabPath);
Graphics render = Graphics.FromImage(template);
//get the size and positions for this text
SizeF size = render.MeasureString(tab.Text, this.TabFont);
PointF center = HeaderRenderControl._TabPositions[index];
//render the text at the appropriate position
render.DrawString(
tab.Text,
this.TabFont,
new SolidBrush(Color.Black),
new PointF(
center.X - (size.Width / 2),
center.Y - (size.Height / 2)
));
//get the jpeg encoder
ImageCodecInfo encoder = ImageCodecInfo.GetImageEncoders()
.Where(o => o.FormatID == ImageFormat.Jpeg.Guid)
.First();
//set the image quality
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(
Encoder.Quality,
HeaderRenderControl.TAB_IMAGE_QUALITY
);
//save the final image for use
template.Save(path, encoder, parameters);
//clean up the rendering classes
template.Dispose();
render.Dispose();
}
/// <summary>
/// Creates a header with one (1) tabs
/// </summary>
public HeaderRenderControl(Font font, LogoDetails logo, TabDetails tab1)
{
this._SetupHeaderControl(font, logo, new TabDetails[] { tab1 });
}
/// <summary>
/// Creates the correct Url for an image and if needed, renders the tab
/// </summary>
/// <remarks>
/// The URL is determined by generating a hashcode from the name provided
/// this code is checked each time the page renders (incase the images
/// change).
/// </remarks>
public string GetTabUrl(TabDetails tab)
{
//make sure this tab doesn't exceed the maximum tabs
int tabIndex = this.Tabs.ToList().IndexOf(tab);
if (tabIndex == MAXIMUM_TABS) {
throw new ArgumentOutOfRangeException(HeaderRenderControl.EXCEPTION_TOO_MANY_TAGS);
}
//make sure any tab was found to begin with
if (tabIndex == -1) {
throw new ArgumentException(HeaderRenderControl.EXCEPTION_TAG_NOT_IN_COLLECTION);
}
//create an identifier for this image using the index
//of the tab and the text to display. This will determine
//if this tab has already been rendered or not
bool isLastTab = (tabIndex == Tabs.Length - 1);
string identifier = string.Concat(
tabIndex, //where the tab is
tab.Text, //what the tag says
isLastTab.ToString() //string true or false for it's end point
)
.GetHashCode()
.ToString();
//create the image name by appending the prefix and path
//onto a hashcode of the file name.
string imagePath = string.Concat(
HeaderRenderControl.TAB_PATH_AND_PREFIX,
identifier,
HeaderRenderControl.TAB_FILE_TYPE
);
//check for this image - if it does not exist, remove it now
string fullPath = HttpContext.Current.Server.MapPath(imagePath);
if (!File.Exists(fullPath)) {
//render the tab image
this._RenderTab(tab, fullPath, tabIndex, isLastTab);
}
//return the path to this file
return VirtualPathUtility.ToAbsolute(
imagePath,
HttpContext.Current.Request.ApplicationPath
);
}