/// <summary>
/// Generates the preview.
/// </summary>
/// <param name="entry">The entry.</param>
/// <remarks>Documented by Dev08, 2008-12-09</remarks>
private static void GeneratePreview(LearningModulesIndexEntry entry)
{
Bitmap preview = new Bitmap(MAX_WIDTH, MAX_HEIGHT); //Todo: get the available preview size
Graphics g = Graphics.FromImage(preview);
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
try
{
LearningModulePreviewStruct lmps = GetLearningModulePreviewData(entry.Dictionary, entry.ConnectionString);
Font font = new Font("Arial", 9.0f);
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
//Preview Background:
g.FillRectangle(Brushes.White, 0, 0, MAX_WIDTH, MAX_HEIGHT);
//Border
g.DrawLine(Pens.Black, new Point(0, 0), new Point(0, MAX_HEIGHT));
g.DrawLine(Pens.Black, new Point(0, 0), new Point(MAX_WIDTH, 0));
g.DrawLine(Pens.Black, new Point(0, MAX_HEIGHT - 1), new Point(MAX_WIDTH - 1, MAX_HEIGHT - 1));
g.DrawLine(Pens.Black, new Point(MAX_WIDTH - 1, 0), new Point(MAX_WIDTH - 1, MAX_HEIGHT - 1));
//Text String:
lmps.Text = FitStringToArea(g, lmps.Text, font, MAX_WIDTH);
g.DrawString(lmps.Text, font, Brushes.Black, new RectangleF(0, 0, MAX_WIDTH, 15), stringFormat); //the rectangleF is needed to cut the string if FitStringToArea does not cut enough of the string.
//Preview Image:
g.DrawImage(lmps.Media, MAX_WIDTH / 2 - lmps.Media.Width / 2, 15);
LearningModulePreview lmPreview = new LearningModulePreview();
lmPreview.Description = lmps.Description;
lmPreview.PreviewImage = (Image)preview.Clone();
entry.Preview = lmPreview;
}
catch (Exception ex)
{
Debug.WriteLine("LearningModulesIndex.GeneratePreview(" + entry.DisplayName + ")" + ex.Message);
}
finally
{
preview.Dispose();
g.Dispose();
}
}
/// <summary>
/// Gets the learning module preview data. (Question; Question-Example Text; Media as Bitmap
/// </summary>
/// <param name="learningModule">The learning module.</param>
/// <returns></returns>
/// <remarks>Documented by Dev08, 2008-12-04</remarks>
private static LearningModulePreviewStruct GetLearningModulePreviewData(IDictionary learningModule, ConnectionStringStruct connectionString)
{
LearningModulePreviewStruct lmps = new LearningModulePreviewStruct();
//if (learningModule is PreviewDictionary)
//{
// connectionString.ReadOnly = true;
// IUser user = UserFactory.Create((GetLoginInformation)delegate(UserStruct u, ConnectionStringStruct c) { return u; },
// connectionString, (DataAccessErrorDelegate)delegate { return; }, this);
// learningModule = user.Open();
//}
try
{
//1. Check if there are Images in the Learning Module and select the card with the images
int count = 0;
bool foundImage = false;
foreach (ICard card in learningModule.Cards.Cards)
{
count++;
if (count > MAX_CARDS_TO_SEARCH)
break;
if (card.QuestionMedia.Count > 0) //Search in all Cards where Question Media data are available
{
foreach (IMedia media in card.QuestionMedia) //Search in all Media data for a Image
{
if (media.MediaType == EMedia.Image)
{
foundImage = true;
try
{ //Try to open the Media file
if (learningModule is PreviewDictionary)
{
string wd = Directory.GetCurrentDirectory();
Directory.SetCurrentDirectory(Path.GetDirectoryName(learningModule.Connection));
lmps.Media = new Bitmap(media.Stream);
Directory.SetCurrentDirectory(wd);
}
else
lmps.Media = new Bitmap(media.Stream);
}
catch (Exception ex)
{
Trace.WriteLine("Exeption in GetLearningModulePreviewData " + learningModule.Title + "; found image not available - continue searching for images; Exception: " + ex.Message);
foundImage = false; //error loading image... no valid image found
}
if (foundImage) //if image found... stop searching for images in this Card
break;
}
}
if (foundImage) //If an Image was found, get the Text data to the according Image
{
lmps.Text = IWordsToString(card.Question.Words);
lmps.ExampleText = IWordsToString(card.QuestionExample.Words);
break; //stop searching for cards/images in this learning module
}
}
}
//2. If there are no Images in the LM, take the first
if (!foundImage)
{
if (learningModule.Cards.Cards.Count > 0) //no image, but cards available
{
lmps.Text = IWordsToString(learningModule.Cards.Cards[0].Question.Words);
lmps.ExampleText = IWordsToString(learningModule.Cards.Cards[0].QuestionExample.Words);
lmps.Media = GetEmptyImage((int)(MAX_IMAGE_WIDTH * DEFAULT_WIDTH_TO_HEIGHT), MAX_IMAGE_HEIGHT, false);
}
else //no image and no cards available
{
//Todo: add code here to set the default Text for Text/Example when the LM is empty
lmps.Media = GetEmptyImage((int)(MAX_IMAGE_WIDTH * DEFAULT_WIDTH_TO_HEIGHT), MAX_IMAGE_HEIGHT, true);
}
lmps.Description = learningModule.Description;
return lmps; //Everything is done ... no image resizing necessary, because there is no image in the LM
}
//Adjust the preview-picture
int resizedWidth = 0, resizedHeight = 0;
bool resized = false;
//1. Check if the Image Width is too large
if (lmps.Media.Width > MAX_IMAGE_WIDTH)
{
double resizeFactor = (double)MAX_IMAGE_WIDTH / lmps.Media.Width;
resizedWidth = (int)(lmps.Media.Width * resizeFactor);
resizedHeight = (int)(lmps.Media.Height * resizeFactor);
resized = true;
}
if (resized) //Check the resized Height
{
//2. Check if the Image Height is too large (check the resizedHeight; but recalculate with the original dimensions
if (resizedHeight > MAX_IMAGE_HEIGHT)
{
double resizeFactor = (double)MAX_IMAGE_HEIGHT / lmps.Media.Height;
resizedHeight = (int)(lmps.Media.Height * resizeFactor);
resizedWidth = (int)(lmps.Media.Width * resizeFactor);
}
}
else //Check the original height, if the Image wasn't resized in the step before.
{
if (lmps.Media.Height > MAX_IMAGE_HEIGHT)
{
double resizeFactor = (double)MAX_IMAGE_HEIGHT / lmps.Media.Height;
resizedHeight = (int)(lmps.Media.Height * resizeFactor);
resizedWidth = (int)(lmps.Media.Width * resizeFactor);
resized = true;
}
}
if (resized)
lmps.Media = GetThumbnail(lmps.Media, resizedWidth, resizedHeight);
lmps.Description = learningModule.Description;
return lmps;
}
catch (Exception ex)
{
Trace.WriteLine("GetLearningModulePreviewData(" + learningModule.Title + ") throws an exception: " + ex.Message);
lmps.Media = new Bitmap(1, 1);
return lmps;
}
//finally
//{
// learningModule.Dispose();
//}
}
/// <summary>
/// Gets the learning module preview data. (Question; Question-Example Text; Media as Bitmap
/// </summary>
/// <param name="learningModule">The learning module.</param>
/// <returns></returns>
/// <remarks>Documented by Dev08, 2008-12-04</remarks>
private static LearningModulePreviewStruct GetLearningModulePreviewData(IDictionary learningModule, ConnectionStringStruct connectionString)
{
LearningModulePreviewStruct lmps = new LearningModulePreviewStruct();
//if (learningModule is PreviewDictionary)
//{
// connectionString.ReadOnly = true;
// IUser user = UserFactory.Create((GetLoginInformation)delegate(UserStruct u, ConnectionStringStruct c) { return u; },
// connectionString, (DataAccessErrorDelegate)delegate { return; }, this);
// learningModule = user.Open();
//}
try
{
//1. Check if there are Images in the Learning Module and select the card with the images
int count = 0;
bool foundImage = false;
foreach (ICard card in learningModule.Cards.Cards)
{
count++;
if (count > MAX_CARDS_TO_SEARCH)
{
break;
}
if (card.QuestionMedia.Count > 0) //Search in all Cards where Question Media data are available
{
foreach (IMedia media in card.QuestionMedia) //Search in all Media data for a Image
{
if (media.MediaType == EMedia.Image)
{
foundImage = true;
try
{ //Try to open the Media file
if (learningModule is PreviewDictionary)
{
string wd = Directory.GetCurrentDirectory();
Directory.SetCurrentDirectory(Path.GetDirectoryName(learningModule.Connection));
lmps.Media = new Bitmap(media.Stream);
Directory.SetCurrentDirectory(wd);
}
else
{
lmps.Media = new Bitmap(media.Stream);
}
}
catch (Exception ex)
{
Trace.WriteLine("Exeption in GetLearningModulePreviewData " + learningModule.Title + "; found image not available - continue searching for images; Exception: " + ex.Message);
foundImage = false; //error loading image... no valid image found
}
if (foundImage) //if image found... stop searching for images in this Card
{
break;
}
}
}
if (foundImage) //If an Image was found, get the Text data to the according Image
{
lmps.Text = IWordsToString(card.Question.Words);
lmps.ExampleText = IWordsToString(card.QuestionExample.Words);
break; //stop searching for cards/images in this learning module
}
}
}
//2. If there are no Images in the LM, take the first
if (!foundImage)
{
if (learningModule.Cards.Cards.Count > 0) //no image, but cards available
{
lmps.Text = IWordsToString(learningModule.Cards.Cards[0].Question.Words);
lmps.ExampleText = IWordsToString(learningModule.Cards.Cards[0].QuestionExample.Words);
lmps.Media = GetEmptyImage((int)(MAX_IMAGE_WIDTH * DEFAULT_WIDTH_TO_HEIGHT), MAX_IMAGE_HEIGHT, false);
}
else //no image and no cards available
{
//Todo: add code here to set the default Text for Text/Example when the LM is empty
lmps.Media = GetEmptyImage((int)(MAX_IMAGE_WIDTH * DEFAULT_WIDTH_TO_HEIGHT), MAX_IMAGE_HEIGHT, true);
}
lmps.Description = learningModule.Description;
return(lmps); //Everything is done ... no image resizing necessary, because there is no image in the LM
}
//Adjust the preview-picture
int resizedWidth = 0, resizedHeight = 0;
bool resized = false;
//1. Check if the Image Width is too large
if (lmps.Media.Width > MAX_IMAGE_WIDTH)
{
double resizeFactor = (double)MAX_IMAGE_WIDTH / lmps.Media.Width;
resizedWidth = (int)(lmps.Media.Width * resizeFactor);
resizedHeight = (int)(lmps.Media.Height * resizeFactor);
resized = true;
}
if (resized) //Check the resized Height
{
//2. Check if the Image Height is too large (check the resizedHeight; but recalculate with the original dimensions
if (resizedHeight > MAX_IMAGE_HEIGHT)
{
double resizeFactor = (double)MAX_IMAGE_HEIGHT / lmps.Media.Height;
resizedHeight = (int)(lmps.Media.Height * resizeFactor);
resizedWidth = (int)(lmps.Media.Width * resizeFactor);
}
}
else //Check the original height, if the Image wasn't resized in the step before.
{
if (lmps.Media.Height > MAX_IMAGE_HEIGHT)
{
double resizeFactor = (double)MAX_IMAGE_HEIGHT / lmps.Media.Height;
resizedHeight = (int)(lmps.Media.Height * resizeFactor);
resizedWidth = (int)(lmps.Media.Width * resizeFactor);
resized = true;
}
}
if (resized)
{
lmps.Media = GetThumbnail(lmps.Media, resizedWidth, resizedHeight);
}
lmps.Description = learningModule.Description;
return(lmps);
}
catch (Exception ex)
{
Trace.WriteLine("GetLearningModulePreviewData(" + learningModule.Title + ") throws an exception: " + ex.Message);
lmps.Media = new Bitmap(1, 1);
return(lmps);
}
//finally
//{
// learningModule.Dispose();
//}
}
