[webkit-dev] How to add a progress bar of page loading with webkit?
sullivan at apple.com
Fri Oct 9 06:05:32 PDT 2009
I'm not sure where you are looking. This is from WebView.h:
@discussion Notifications sent by WebView to mark the progress of
@constant WebViewProgressStartedNotification Posted whenever a
load begins in the WebView, including
a load that is initiated in a subframe. After receiving this
notification zero or more
WebViewProgressEstimateChangedNotifications will be sent. The
userInfo will be nil.
@constant WebViewProgressEstimateChangedNotification Posted
whenever the value of
estimatedProgress changes. The userInfo will be nil.
@constant WebViewProgressFinishedNotification Posted when the
load for a WebView has finished.
The userInfo will be nil.
extern NSString *WebViewProgressStartedNotification;
extern NSString *WebViewProgressEstimateChangedNotification;
extern NSString *WebViewProgressFinishedNotification;
@discussion An estimate of the percent complete for a document
value will range from 0 to 1.0 and, once a load completes, will
remain at 1.0
until a new load starts, at which point it will be reset to 0.
The value is an
estimate based on the total number of bytes expected to be received
for a document, including all it's possible subresources. For
more accurate progress
indication it is recommended that you implement a
WebFrameLoadDelegate and a
On Oct 9, 2009, at 1:55 AM, Jickae Davis wrote:
> Well, I checked the WebView.h, and didn't find the estimateProgress
> method and the three associated notifications.
> Then I searched them in the chrome's whole solution, didn't get any
> clue too.....
> 2009/9/28 John Sullivan <sullivan at apple.com>
> The Chrome and Safari teams have chosen not to display approximate
> progress bars for user interface design reasons.
> You can implement a progress bar for a WebKit-based browser by using
> the -estimatedProgress method in WebView.h and the associated
> notifications WebViewProgressStartedNotification,
> WebViewProgressEstimateChangedNotification, and
> Note that any such progress bar (in any web browser, WebKit-based or
> not) is only an approximation, because as a page loads resources, it
> might discover additional resources that need to be loaded, so the
> page cannot know in advance how much more there is to load.
> On Sep 28, 2009, at 12:14 AM, Jickae Davis wrote:
>> I'm wonderring why Chrome and Safari don't add a progress bar which
>> indicates the progress of loading a html page.
>> I took a look at all the ViewMsg and ViewHostMsg in Chrome's src,
>> and didn't find anything related.
>> So, is that unimpossible to create such a progress bar?
>> If it's not so hard, how to achieve that?
>> webkit-dev mailing list
>> webkit-dev at lists.webkit.org
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