async Task<UIImage> GenerateDocumentThumbnailAsync (IDocument s, Praeclarum.Graphics.SizeF size, Theme theme)
{
var scale = UIScreen.MainScreen.Scale;
return await Task.Run (() => {
var width = (int)(size.Width * scale);
var height = (int)(size.Height * scale);
using (var colorSpace = CoreGraphics.CGColorSpace.CreateDeviceRGB ()) {
using (var c = new CoreGraphics.CGBitmapContext (
IntPtr.Zero,
width,
height,
8,
4 * width,
colorSpace,
CoreGraphics.CGImageAlphaInfo.NoneSkipFirst)) {
c.TranslateCTM (0, height);
c.ScaleCTM (scale, -scale);
var g = new Praeclarum.Graphics.CoreGraphicsGraphics (c, true);
App.DrawThumbnail (s, g, size, theme);
//
// Create the bitmap
//
return UIImage.FromImage (c.ToImage (), scale, UIImageOrientation.Up);
}
}
});
}
public DocumentsViewItem GetItemAtPoint (Praeclarum.Graphics.PointF p)
{
var index = IndexPathForRowAtPoint (Praeclarum.Graphics.RectangleEx.ToPointF (p));
if (index == null)
return null;
var i = index.Row;
return Items[i];
}
public virtual async Task<UIImage> GenerateThumbnailAsync (DocumentReference docRef, Praeclarum.Graphics.SizeF size, Theme theme)
{
UIImage r = null;
IDocument doc = null;
LocalFileAccess local = null;
var opened = false;
//
// Draw the document
//
try {
local = await docRef.File.BeginLocalAccess ();
var f = local.LocalPath;
doc = App.CreateDocument (f);
await doc.OpenAsync ();
opened = true;
// Console.WriteLine ("GenerateThumbnail: " + docRef.File.Path + " " + docRef.File.ModifiedTime);
r = await GenerateDocumentThumbnailAsync (doc, size, theme);
} catch (Exception ex) {
Debug.WriteLine ("FAILED to genenerate thumbnail for {0}, {1}", docRef.File.Path, ex.Message);
// Debug.WriteLine (ex);
}
if (opened) {
try {
await doc.CloseAsync ();
} catch (Exception ex) {
Console.WriteLine (ex);
}
}
if (local != null) {
try {
await local.End ();
} catch (Exception ex) {
Console.WriteLine (ex);
}
}
return r;
}
public DocumentsViewItem GetItemAtPoint (Praeclarum.Graphics.PointF p)
{
var index = IndexPathForItemAtPoint (Praeclarum.Graphics.RectangleEx.ToPointF (p));
if (index == null || index.Section == 0)
return null;
var i = index.Row - 1;
if (0 <= i && i < Items.Count)
return Items [i];
return null;
}
