public static SlidePreview CreateFromSlide(Slide slide, string presentationId, string text = null)
{
var preview = new SlidePreview();
preview.slideText = text ?? (slide != null ? ("" + slide.SlideNumber) : "1");
preview.presentationId = presentationId;
preview.slideImage = new BitmapImage();
byte[] buffer;
if (slide == null || slide.ImageData == null) {
var bitmap = new Bitmap(1024, 768);
var g = Graphics.FromImage(bitmap);
g.Clear(Color.Transparent);
using (var memory = new MemoryStream()) {
bitmap.Save(memory, ImageFormat.Png);
memory.Position = 0;
using (var br = new BinaryReader(memory)) {
buffer = br.ReadBytes((Int32) memory.Length);
}
}
if (slide != null) slide.ImageData = buffer;
} else {
buffer = slide.ImageData;
}
preview.slideImage.BeginInit();
preview.slideImage.StreamSource = new MemoryStream(buffer);
preview.slideImage.EndInit();
return preview;
}
public static SlidePreview CreateAddNewSlide(string presentationId, string text = "New Slide")
{
var preview = new SlidePreview();
preview.slideText = text;
preview.presentationId = presentationId;
preview.slideImage = new BitmapImage();
var bitmap = new Bitmap(Resources.newSlide);
byte[] buffer;
using (var memory = new MemoryStream()) {
bitmap.Save(memory, ImageFormat.Png);
memory.Position = 0;
using (var br = new BinaryReader(memory)) {
buffer = br.ReadBytes((Int32)memory.Length);
}
}
preview.slideImage.BeginInit();
preview.slideImage.StreamSource = new MemoryStream(buffer);
preview.slideImage.EndInit();
return preview;
}
/// <summary>
/// Start a Presentation and start a Command Receive Thread
/// </summary>
public void StartPresentation(SlidePreview presentationPreview)
{
new Thread(() => {
if (ShowPresentation != null) {
var p = FetchPresentation(presentationPreview);
if (p == null) {
if (CancelStartPresentation != null) CancelStartPresentation(this, null);
return;
}
ShowPresentation(this, p);
commandThread = new Thread(RequestNextCommand);
commandThread.Start();
} else {
if (CancelStartPresentation != null) CancelStartPresentation(this, null);
}
}).Start();
}
/// <summary>
/// Get All Slides of a Presentation
/// </summary>
private Presentation FetchPresentation(SlidePreview presentationPreview)
{
var slides = new List<Slide>();
var cnt = service.GetPresentationSlidesCount(clientId, presentationPreview.PresentationId);
if (cnt < 0) return null;
if (GotPresentationSlidesCount != null) GotPresentationSlidesCount(this, cnt);
for (var i = 0; i < cnt; ++i) {
var slide = service.GetPresentationSlide(clientId, presentationPreview.PresentationId, i);
if (slide == null) return null;
if (GotPresentationSlide != null) GotPresentationSlide(this, null);
slides.Add(slide);
}
return new Presentation {
Id = presentationPreview.PresentationId,
Name = presentationPreview.SlideText,
Owner = clientId,
Slides = slides
};
}
/// <summary>
/// Edit a Presentation, so fetch and display as a first Step
/// </summary>
public void ChangePresentation(SlidePreview presentationPreview)
{
new Thread(() => {
if (EditPresentation != null) {
var p = FetchPresentation(presentationPreview);
if (p == null) return;
currentPresentation = p;
CommandManager.InvalidateRequerySuggested();
EditPresentation(this, currentPresentation);
} else {
if (CancelStartPresentation != null) CancelStartPresentation(this, null);
}
}).Start();
}
