Leaves and UIWebView (1)

From: http://groups.google.com/group/leaves-developers/browse_thread/thread/27e4bf5ff3c53113

 

 

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Varedis   View profile    More options Jul 16, 6:13 am I am not sure if Tom checks this page anymore, or even if he has time  to work on Leaves anymore, however if he is around or if anyone would  like to do a little brainstorming on how we can enhance Leaves, feel  free to join me.  I am trying to implement a UIWebView with Leaves in order to show epub  books. Now I don't need the scrolling as the text that falls off  screen will be passed to the next page, so basically it is just a  dynamic PDF.  Now in theory I believe it would be possible to capture what is  displayed in the UIWebView to an image with:  UIGraphicsBeginImageContext(webview.bounds.size);  [webview.layer renderInContext:UIGraphicsGetCurrentContext()];  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();  UIGraphicsEndImageContext();  and then animate this using the same code as the page flip. When the  user is about to flip it would load up another UIWebView behind with  the next bit of text.  I am basically trying to hack and slash my way through the leaves code  to implement this, and if anyone has anything to add, feel free     Forward

Saqib Saud   View profile    More options Jul 16, 7:12 am Wow! Im working on something else.... trying to zoom in/out pdf page ...and  move it.  for me time is short, Im stressing in finishing the job rather than adding  perfection.  On Fri, Jul 16, 2010 at 3:13 PM, Varedis <robert.scot...@btinternet.com>wrote:  - Show quoted text -       Forward

Melvin Dave Vivas   View profile    More options Jul 16, 7:15 am Hi Saqib,  Will you be sharing the zoom implementation as well? I'm also interested in  doing something similar.  Melvin  - Show quoted text -       Forward

Saqib Saud   View profile    More options Jul 16, 7:15 am Okay I will, For now im running in alot of problems :(  On Fri, Jul 16, 2010 at 4:15 PM, Melvin Dave Vivas <melvind...@gmail.com>wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 19, 7:55 am Ok, got the UIWebView working somewhat by using:  - (void) renderPageAtIndex:(NSUInteger)index inContext:  (CGContextRef)ctx {          UIGraphicsBeginImageContext(webView.bounds.size);          [webView.layer renderInContext:UIGraphicsGetCurrentContext()];          UIImage *image = UIGraphicsGetImageFromCurrentImageContext();          UIGraphicsEndImageContext();          CGRect imageRect = CGRectMake(0, 0, image.size.width,  image.size.height);          CGAffineTransform transform = aspectFit(imageRect,                                                                                          CGContextGetClipBoundingBox(ctx));          CGContextConcatCTM(ctx, transform);          CGContextDrawImage(ctx, imageRect, [image CGImage]);    }  It does show the WebView flipping over just as it would for a pdf,  however in most cases it is throwing up an error, and because of this  missing pages out.  the error:  bool _WebTryThreadLock(bool), 0x4b3d7a0: Tried to obtain the web lock  from a thread other than the main thread or the web thread. This may  be a result of calling to UIKit from a secondary thread. Crashing  now...  Apparently this is caused by trying to interact with UI elements on a  background thread.  Anybody with a little bit more experience know a way around this?  On Jul 16, 12:15 pm, Saqib Saud <wisesa...@gmail.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 19, 11:55 am For anyone that may be interested in this here is a little video:  http://screencast.com/t/ZmM5MjI1  This demo is basically taking an xml file, loading it up in a  UIWebView and then rendering it to a static image.  The first view you see in the video is the actual UIWebView that  displays the content, this is a subview that is then hidden (this is  obviously going to be a static page as well but there are a few coding  issues to work around first.  The blank page is also caused by the same issue mentioned above  The third and fourth pages are the data from the UIWebView that has  been rendered static by Leaves  Just for fun:  http://screencast.com/t/MDAyMWM1  Loading up a webpage, as you can see same initial problem with the  first two pages. But then the website basically becomes a book.  On Jul 19, 12:55 pm, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 19, 5:24 pm Hi again,  Not sure if anyone is even interested in this but might as well keep  documenting it.  I have managed to fix it so the first page is actually rendered, but  the first and second page are both the same.  This is because where I should be taking the image of the next page, I  am actually taking the current page, so it is offsetting everything by  one page.  The PDFExample implements this in the render method:  CGPDFPageRef page = CGPDFDocumentGetPage(pdf, index + 1);  I need to figure a way to implement the same thing for a UIWebView  On Jul 19, 4:55 pm, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Melvin Dave Vivas   View profile    More options Jul 19, 11:57 pm I'm interested! If you get to implement this then you can even put all of  your content online and still have the book effect.  Melvin  ---  Follow me in Twitter! - http://twitter.com/donvito  On Tue, Jul 20, 2010 at 5:24 AM, Varedis <robert.scot...@btinternet.com>wrote:  - Show quoted text -       Forward

Carlo   View profile    More options Jul 20, 3:18 am I am VERY interested too!  But I am a beginner, and for me Xcode and ObjC are unfamiliar...  I'll follow your progress!  On 19 Lug, 23:24, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 20, 3:31 am While the possibility is there, you would be neglecting the part of  the market that are on Ipod touches, and anyone without a data plan.  I am developing on an Ipod touch and I find it frustrating when I need  to connect to the internet to use an app. Especially something that  are supposed to be portable like books.  In my opinion, it shouldn't matter if I am at home, or up mount  Everest, I should still be able to use the app.  I am using in app purchasing in my app to download the book to the  users document folder and then it will be stored in there for use at  any time.  On Jul 20, 4:57 am, Melvin Dave Vivas <melvind...@gmail.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 20, 7:05 am Ok I am making some headway now,  New video:  http://screencast.com/t/ZDc3NWNmMDct  Now I have chosen to show a cover image first as this is how I am  going to want my books to work anyway, the flash of text you see at  the start is the webview loading up, I need to try and hide that.  The pages are then all rendered correctly, till the end of the book.  You may also notice on my last page I have a bit of overlapped text  from the last page, this is caused by the UIWebView not having enough  content to scroll down far enough, so it is scrolling down to its  limit and then repeating some text.  I have sorted this by using javascript to insert a spacer at the end  and sizing it to the discrepancy.  The new video of that:  To do still:  Make sure that no text can be cut in half by sitting on the edge of  the webview frame. (the biggest problem)  Implement overlays when the user touches the middle of the screen (I  have done this for PDF already so that should be a quick port)  Slider to change font size (maybe also two finger pinch and pull)  On Jul 20, 8:31 am, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 20, 7:06 am Forgot to include the new vid:  http://screencast.com/t/Yjg5NGU2N  On Jul 20, 12:05 pm, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Carlo   View profile    More options Jul 20, 9:41 am Wow! Good work!  Can you release the source code?  On 20 Lug, 13:06, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 20, 9:51 am Once I have added the last remaining bits I will be releasing the  source code to you guys.  One note however, I have broken the ability to view websites as books,  in order for me to delay the immediate firing of the renderpageatindex  method I had to change a tiny bit of leaves code.  This seems to have stopped websites from rendering properly but for my  included code it seems to be working fine.  I will not be fixing this issue, unless it causes problems related to  my app.  On Jul 20, 2:41 pm, Carlo <carlo.ge...@gmail.com> wrote:  - Show quoted text -       Forward

Carlo   View profile    More options Jul 20, 10:06 am But is it possible to use pinchzoom and tapzoom with pdf files?  On 20 Lug, 15:51, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -       Forward

Varedis   View profile    More options Jul 21, 3:55 am Carlo, I am not really dealing with the PDF side of leaves however you  could take my code as an example and work on a solution for yourself,  I will be honest and say I don't know much about the IPhone SDK, but  working on this has really helped to broaden my knowledge and think  outside the box to problems.  New Video:  http://screencast.com/t/ZjFjNTFiOT  Done:  Slider to resize text (Going to change this to two buttons to step the  text size as I am finding it annoying to find the default value again  or get back to a certain value)  Overlays are done.  Still to do:  Make sure text doesn't fall off the page  Use the slider already implemented to allow flipping to a certain  page.  On Jul 20, 3:06 pm, Carlo <carlo.ge...@gmail.com> wrote:  - Show quoted text -   ... read more »     Forward

Varedis   View profile    More options Jul 22, 10:06 am Hey Guys,  Another video update:  http://screencast.com/t/NDNjODFkODMt  The two images in the bottom left of the overlay will represent the  text sizes plus and minus.  The bottom right image is for changing the colour styles as you can  see.  Issues:  If you resize the text will in black and white mode the text  disappears.  Noticed in the video as well that colour switching will make the text  smaller or larger.  Also need to sort out returning to the page on these switches  On Jul 21, 8:55 am, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -   ... read more »     Forward

Varedis   View profile    More options Jul 27, 10:58 am Its been a slow few days but it looks like I have found a solution to  the text sitting on the page correctly and not falling of the edge.  I will hopefully be able to get a video of this tonight.  On Jul 22, 3:06 pm, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -   ... read more »     Forward

Varedis   View profile    More options Aug 4, 4:43 am Cracked it!  Finally after days and weeks of attempts and hacking and slashing code  together I found out how to paginate the code correctly so nothing  hangs of the edge no matter the size, video:  http://screencast.com/t/ZTRjMzk4NmEt  A bit of tidy up and sorting a few things out like opening at page and  auto bookmarking and we are ready to go.  On Jul 27, 3:58 pm, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -   ... read more »     Forward

tbashir   View profile    More options Aug 12, 2:32 pm Your latest version looks excellent. Are you planning to share the  updates you've made to the code to get this extra functionality? Would  really appreciate it.  Tariq  On Aug 4, 9:43 am, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -   ... read more »     Forward

Varedis   View profile    More options Aug 12, 5:09 pm Hi Tariq,  I do plan on releasing the source, but it is no where near ready yet,  There is a very big problem with page indexing.  At the minute, the only solution is to keep the page cache and never  flush it, but of course this fills up memory very quick and crashes  after 50 pages.  So I need to devise a way to set up rendering so it can pick out  proper pages.  On Aug 12, 7:32 pm, tbashir <tbashi...@gmail.com> wrote:  - Show quoted text -   ... read more »     Forward

Josh   View profile    More options Aug 13, 5:09 pm Varedis,  Ive got to say, that is pretty impressive. Excellent work!  On Aug 12, 4:09 pm, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -   ... read more »     Forward

sneha   View profile    More options Sep 2, 3:16 am Hi Varedis,  I am tryng to create a epub reader (i checked out the video its  amazing) . I have already changed the font and the color and  everything via a CSS file in the html pages. I am stuck up with the  paging of the webPage (html file) i mean dynamically analyze the  everything and prevent the images for cropping .  I tried using the  scrollToTop (javascript) one but its not working the way i want to :(.  Any help is appreciated.  On Aug 13, 2:09 am, Varedis <robert.scot...@btinternet.com> wrote:  - Show quoted text -   ... read more »     Forward

Varedis   View profile    More options Sep 2, 3:53 am Hi,  Are you using images in your html file or just text?  On Sep 2, 8:16 am, sneha <jacksn...@gmail.com> wrote:  - Show quoted text -   ... read more »     Forward

snehal..............   View profile    More options Sep 2, 4:36 am Hi,  I am using images + text . I know its very difficult to do that with the  images inside it  :) . But atleast i want to get started so i can improve it  . Currently i m looking at something like finding the pixel height of the  font via javascript but i just wanted to know how you have done the chunking  of the HTML file (when you change the font also) . Can you help me atleast  getting started via guiding me in a right direction . Because i will be  ending up doing wht you have shown in your final video :) .  And can work on  the other features like playing a video embedded inside it or the  interactivity of the reader. (like a digital magazine) .  On Thu, Sep 2, 2010 at 1:23 PM, Varedis <robert.scot...@btinternet.com>wrote:  - Show quoted text -   ... read more »     Forward