Re: LayoutPanel and Custom Widget
Either your custom widget extends ResizeCompositehttp://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/client/ui/ResizeComposite.html or implements RequiresResize and ProvidesResize interfaces. This will ensure that the onResize event is propagated to your LayoutPanel. You have to make sure that you put your widget in a ResizeLayoutPanel or in a Panel which implements ProvidesResize and make sure that there is a unbroken chain of ProvesResize/RequiresResize panels up to the RootLayoutPane. Whenever you resize your browser LayoutPanel will resize accordingly. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/yxcKVSMLYFEJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: GWT client static variable versus Server side Session object
Well it depends. If you use a server side session object the information (i.e. locale) will be probably stored in a Cookie and transmitted whenever you initiate a HTTP request (communicate with the backend) and it is always available on the backend. If you store it as a static variable you have to add to manually to the request to the backend. Furthermore with Cookies you can specify a lifespan which goes beyond the session and the information is also available when you refresh the browser. That's not possible with client side variable unless you use HTML5 localcache. to summarize: Server side session: Advantages: - transmitted in every request (so it's always available on the backend) - lifespan beyond current session (via Cookie expire date) Disadvantages: - Always transmitted - small overhead Client side static variable: Advantages: - You can control when the information is transmitted Disadvantages: - Information is lost if you refresh or close the browser -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/W-N6sZpK8T4J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How use caching with gwt
@Ed: Interesting, I didn't know about the PrecrompressLinker. What's the difference to configuring the web-server to do gzip compression on the fly? I suppose the advantage is that it doesn't burden the server -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/xmSKRf1D5W4J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How use caching with gwt
You have to clarify what you mean with caching? If you refer to caching of the javascript files that are transfered to the client then refer to these docs: - http://code.google.com/speed/articles/caching.html - http://code.google.com/speed/page-speed/docs/caching.html If you are talking about caching of data then you have several possibilities: - caching by storing in static variables - HTML5 Localstorage (http://code.google.com/webtoolkit/doc/latest/DevGuideHtml5Storage.html) - gwt-mobile-webkit (http://code.google.com/p/gwt-mobile-webkit/) -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/6wROQ830HocJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How to change css value's through CssResource mechanism?
If the FlexButton uses ClientBundle and CssResources you should be able to override it on instance level. Similar to how you can do it with the CellWidget where you can pass a different CssResource implementation in the constructor. However this requires that you somehow have access to the ClientBundle/CssResource file of your FlexButton -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/BnOF8UAQm44J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: CandleStick Chart using GWT Java API
The gwt-google-api visualization api doesn't contain a GWT wrapper for the Candlestick Chart however it is quite straightforward to create one yourself. Here is a tutorialhttp://code.google.com/p/gwt-google-apis/wiki/VisualizationNewWrapper . You can take the LineChart http://code.google.com/p/gwt-google-apis/source/browse/trunk/visualization/visualization/src/com/google/gwt/visualization/client/visualizations/corechart/LineChart.javawarpper (from the corechart package) as an example. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/FFFJkRAN-iQJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Is GWT's obfuscate compilation safe enough to protect the js code?
Depends. You can apply authentication and authorization on the server/backend to make sure that not anyone can use it. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/U-AaJVo55toJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Is GWT's obfuscate compilation safe enough to protect the js code?
@Palo G. Actually I wasn't suggesting to protect the generated javascript but to put the algorithm on the server/backend and access it from the client via RPC or any other method. I think what OrNot wanted to know is whether he can somehow make sure that only specific user can execute the RPC call and this can be done if the RPC is secured via some authentication/authorization mechanism. I also agree security by obscurity is not the right approach. However I do believe there is a use case for time consuming computations on the client side. With each browser iteration/version Javascript Engine becomes faster and faster and nowadays a common desktop machine/laptop has enough horse power to do computational intense calculations on the client side. So I think more and more some computational tasks which used to be done on the backend will move to the client. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/c83YRnzgjYcJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Is GWT's obfuscate compilation safe enough to protect the js code?
@Harpal Grover: Actually there might be a solution right now. You can use Native Client SDKhttp://code.google.com/chrome/nativeclient/to develop a C++/C application which runs in the browser. The application will be compiled to a binary and then transmitted to the client/browser where it is executed in a sandbox. It is still possible to use a Dis-assembler in order to figure out the algorithm however it is much harder than obfuscated javascript code. However until now NaCl is only supported in Chrome. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/BKKtXBypOI8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: GWT capabilities
Of course you can achieve that with GWT. Note: GWT is a client side toolkit. So it won't help you with the server side stuff (Spring, JSP, etc). The question is whether it is not easier to use a traditional javascript framework (jQuery, etc) instead of GWT because apparently you are developing a traditional webpage/website (multi-host page with some javascript behaviour). GWT really shines when you want to develop a desktop like interactive web-application (using MVP) where the backend acts only as datasource. That doesn't mean that it can't be used for a normal website but probably frameworks like jQuery are easier to use and get results than GWT. If you use Spring framework MVC and JSP then you will probably only use GWT for AJAX calls and DOM operations that can be as easily achieved with jQuery. If you plan to develop a desktop like web-app where you have one host-page and all the UI flow/synchronization is done on the client side then I would strongly recommend GWT. However if you have multiple-page website (i.e.: using Spring's MVC) and only want to embed some javascript code for some UI behaviour, GWT might not be the easiest solution. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/Cx_VCoZ8lj0J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: CSS optimization
premature optimization is the root of all evil Saying that you, can find more infos about GWT's CSS optimizations in the official gwt docshttp://code.google.com/intl/de-DE/webtoolkit/doc/latest/DevGuideClientBundle.html#Optimizations . -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/Xg0v-RjT8jQJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: large celltable pagination question
I am actually using piriti http://code.google.com/p/piriti/ to convert JSON to my DTOs. Piriti uses Generator and JSONParser internally to convert JSON to DTOs -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/0jgXL-2GTd8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: large celltable pagination question
No, CellTable will only render the visible part. Fetching 500 rows from the server should take too long either. I assume that the slowness is not related to the rendering in the CellTable but probably due to fetching and parsing of the 500 rows because you don't see any difference when you render 5 rows or 500. So it clearly must be something else. There are 3 possible bottlenecks: 1. Fetching the data from the backend: if you use JSON and don't transfer many fields then 500 rows shouldn't be a big issue (you can verfiy it by using Firebug and checking the payload size) 2. Parsing the fetched data: Again with JSON it should be fast enough to parse 500 rows (not sure about XML) 3. Rendering the data in a CellTable: if there is no performance difference between 500 rows and 5 rows then the bottleneck must lie in one of the previous areas. I have no performance problems fetching around 2000 rows and displaying 50 of them (using SimplePager). -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/4F6zBx7p3BkJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Determine widget size after load
Are you using a TabPanel or a TabLayoutPanel? I think you have to use a TabLayoutPanel instead of a TabPanel because the TabLayoutPanel implements both ProvideResize and RequireResize interfaces. Basically you always have to a chain of Panels which implement those interfaces in order to properly propagate the resize event. If you put your Canvas Widget not in a LayoutPanel you have to set a specific height and width for the parent container widget in order to retrieve the dimensions otherwise I think getOffsetWidth will always return 0. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/PpVwXYu7wk8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Determine widget size after load
I think there are two ways to do that.
1.) Call forceLayout() on your LayoutContainer. This will call onResize on
all client widgets which implement the RequireResize interface.
In the onResize method of your canvas widget you can retrieve the available
width by calling getParent().getOffsetWidth() (instead of getParent() you
can call it on a container panel etc)
2.) When the canvas widget gets constructed you can issue a deferred command
and set the size in it:
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
@Override
public void execute() {
canvasWidget.onResize();
}
});
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Re: Full page in GWT or just parts?
I think GWT is best utilized in a full page scenario because of code sharing of re-usable components. If you go the other route and just embed GWT code in different host pages (i.e. application with multiple entry points) you lose the benefits of javascript code re-use of reusable components because every entrypoint will have its own module.nocache.js file which has to be transferred to the client. If you create a re-usable component (let's say a CellTable component) which is used in different places (in both entry points) the same code will be part of the module.nocache.js file and thus downloaded two times. It probably doesn't make a big difference for small web-sites where some parts are done with GWT but for complex apps where you might re-use a lot of components it might be an issue. However in case you go with the one host page (one entry point) solution you will probably not use any of the your backend's flow controls (MVC) but it will solely act as a data-backend. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/cuYO25r6uJ8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: New GWT App for hackers
Really great idea. I haven't had really time to play around but I am looking forward to when I have more time ;-) -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/S0CI6BRuuPkJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: DataGrid (GWT 2.4) not visible in HTMLPanel
@Steve: Thanks for the confirmation. I put the DataGrid in a ResizeLayoutPanel and it works fine now. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/Vl3nht4fiSsJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
DataGrid (GWT 2.4) not visible in HTMLPanel
I am trying to switch from CellTable to the GWT 2.4's new DataGrid
CellWidget however I run into a problem.
I used the CellTable inside two normal divs for styling purposes (border,
etc).
The UiBinder code looked as follows:
*g:HTMLPanel*
*div class={mainRes.style.box_shadow}
*
* div class={mainRes.style.box_container}
*
* c:CellTable ui:field=table
addStyleNames={mainRes.style.cellTable} /*
* /div*
* /div*
*/g:HTMLPanel*
However with the new DataGrid this approach doesn't work anymore. When I
put the DataGrid inside a HTMLPanel, nothing is displayed. I checked with
firebug and I saw that height is 0px.
I then checked the DataGrid source and saw that it implements the
RequireResize interface. So I assume the problem is that HTMLPanel breaks
the
ProvidesResizehttp://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/client/ui/ProvidesResize.html
chain.
I tried to set the height to 100% but it didn't really work.
Is it somehow possible to put the DataGrid inside two normal divs or can I
only place it inside a g:LayoutPanel ?
Thanks in advance
Ümit
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Re: Why rpc requets calls arent operated independetly(concurrently) by methods in server-side code
@Juan: I don't think that the problem is related to Javascript being single threaded. You can have multiple XHTMLHttpRequests running in parallel (with modern browsers up to 6 per domain). @wasyl: Can you post some code on how you call the server requests ? Are you using RPC ? How are the emails downloaded into the server-side db? is that done entirely on the server side? -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/MgcsM2orfEsJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Gwt RequestBuilder + Servlet issue
So you want to send some data to the servlet and want to display a PDF (which is generated by the servlet based on the data sent) in the browser? There are two ways of how to do it: 1.) Using RequestBuilder you could generate a AJAX call to your Servlet (as you did it). However in the callback method of the RequestBuilder you will get the response from the servlet (probably the PDF binary data) and then you could use that to open a new window with the binary PDF data. however I think the easier approach is the following: 2.) Have either a form or a URL which points to the URL of the servlet responsible for generating the PDF. The data you want to pass to the servlet can bei either passed by POST (form) or GET (url) and in the servlet make sure that response headers are set properly (application/PDF). second appraoch is easier. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/YleAom9t2JQJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: What content management system are you using with GWT?
Well I think that content management systems are more like classical web-sites with mostly static content whereas GWT is a toolkit aimed for developing web-applications rather than classical web-sites (tough it can also be used for that). So that's probably the reason why not many content management systems rely on GWT. Furthermore development of most of the popular CMS began before GWT came to live and usually you switch the underlying framework if there is no real reason for it. However that doesn't mean that future CMS won't/can't rely on GWT. In most cases the use case for a web-application is so specific that you have to do user management/authentication yourself and this is actually done mostly on the backend side. Concerning having common components (discussion board etc) on your site I see two scenarios/solutions: 1.) Somebody develops those components as GWT standalone components with a specific API so that it can easily be integrated into existing GWT apps (similar to those plugin systems in CMS) 2.) Just take a third party component and put it in an iframe or theme it similar to your GWT app and have a separate URL for that. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/kkdnbmsrBkcJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: RPC vs other methods
Well your two choices are not real choices. You have to use both more or less. IMHO I would recommend following steps: 1.) have some kind of a cron jobs which runs on the backend and queries all those 10,000 servers in regular intervals and stores the information in a SQL database or some other storage system. 2.) Use RPC, Requestfactory or RequestBuilder (i.e. JSON) to retreive the the server information from the SQL database/storage systems as soon as a user visits the server-list page. 3.) Use a CellTable with a SimplePager and AsyncDataProvider to avoid transfering the entire server list to the client. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/vlIXlX7IsIcJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: What content management system are you using with GWT?
I think serendipity relies/works with GWT: http://uptick.com.au/content/serendipity-working-gwt-platform-and-smartgwt -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/uaox4PCIx9AJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: CellTable + Editor displaying only those rows based on a flag in the bean
You will probably use an AbstractDataProvider instance to fill the
CellTable. You have to create a helper method which retrieves the list of
beans based on the flag and sets it in the AbstractDataProvider (or
ListDataProvider).
Something like this:
final ListDataProviderUser dataProvider = new ListDataProviderUser();
ListUser listToDisplay = new ArrayListUser();
for (User user: userList) {
if (user.isActive())
listToDisplay.add(user);
}
dataProvider.setList(listToDisplay);
dataProvider.addDataDisplay(cellList);
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Re: CellTable custom footer
Hi John I do have a question regarding redrawing the entire DataGrid/CellTable when new data is pushed in. I tried to implement a SearchTextBoxes in the ColumnHeader for filtering the data which is displayed in the CellTable. As soon as I type a character into the SearchTextBox in one of the column headers I filter the ListDataProvider and the CellTable is refreshed. However the refresh/redraw of the celltable causes the SearchTextBox input to lose its focus and currently in GWT 2.3 there is no way to specify that the SearchTextBox gets the focus back which leads to painful user experience (the user has to click into the SearchTextBox again to type in the next character). I have posted this question in Stackoverflow ( http://stackoverflow.com/questions/6422896/celltable-with-custom-header-containing-searchbox-and-focus-problem) but got no responses. https://lh5.googleusercontent.com/-QSUJ0kixSwc/TlIhZUqdDGI/AFs/o48fsjiC5Yc/celltable_search_header.png I solved this problem by creating another table above my CellTable, putting the Searchboxes there and trying to align them to my CellTable headers. But that doesn't seem to be a really good way to do it (check screenshot). Can this problem be solved with the new CellWidget API in 2.4 ? -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/pFoH_rTnnb8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Controlling Size(screen) on Mobile Device
Well, the whole resolution independent web development is really cumbersome especially with GWT like web-application UI. Static web-sites either stick to the static (i.e. 960 grid system) or fluid/liquid (floating) UI design. With the static design the content size is always the same no matter of the resolution you are viewing the web-page. This is done because there is an optimal text length. If you expand text-content to the complete size of the display it becomes really hard to read with high resolution displays. So static web-pages tend to stick the fixed sized layouts. However there is also a move to liquid/fluid layouts where you resize the layout based on the viewport. Check out this articles for more information: http://coding.smashingmagazine.com/2009/06/02/fixed-vs-fluid-vs-elastic-layout-whats-the-right-one-for-you/ http://www.maxdesign.com.au/articles/liquid/ These two concepts work well in the desktop context where you can expect screen resolutions 1024px. However in the mobile context you have to expect lower screen sizes. So there are two solutions to that: You can either use liquid/fluid design. However this doesn't always work well because the sections in of your web-app will be to small and the user has to zoom in and out constantly. For example on a tablet it might be viable to have a navigation panel on the left side and a content panel on the right (DockLayoutPanel). However on a mobile phone it might be better to just have the navigation panel and on clicking an item the content panel is displayed. The second solution is to use different View implementations based on the UserAgent (device). There was a talk on the last Google IO conference on that and a sample project on how to implement it. http://www.google.com/events/io/2011/sessions/using-gwt-and-eclipse-to-build-great-mobile-web-apps.html http://code.google.com/p/google-web-toolkit/source/browse/#svn%2Ftrunk%2Fsamples%2Fmobilewebapp Developing a GWT web-app which works on all desktop resolutions as well as on mobile devices are real challenger. Actually it is difficult enough to achieve this if you only want to optimize for different desktop resolutions, especially if you use Charts which require explicit sizes. The MVP pattern can help to have different view implementations and still avoid redundant code. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/cFqHQYRzFEUJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Help to set Chart Height in Visualization API
As far as I know it is not possible. You have to set explicit sizes for google charts (at least for the height). -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/npkEHT-Cix8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: JQuery like animation
If you don't care much about old browsers you can also use CSS3 transitions/animations for simple stuff. I used it in a GWT project (i.e. ProgressBar) and it works really well. i.e.: http://aatiis.me/demos/pure-css-progress-bar -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/pc9_H6dESdsJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Facebook like Chat App with GWT
Check out ijab. It is based on GWT and look really like the Facebook Chat http://opensource.ijab.im/ -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/p3rzeYNQZOsJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: CellTable, Custom Header and Focus Problem
I played a little bit around and tried to override the resetFocus method on the SearchCell but this method is never called. I suppose this only works if the Cell used in a row context and not in a header context? My approach is somehow run schedule a deffered command which sets the focus but that's doesn't seem to be a really clean approach. Is there maybe a better approach? -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/QoU2tF0rJy4J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
CellTable, Custom Header and Focus Problem
Hi all
I am trying to implement a CellTable with a custom Column Header which
displays a SearchBox (simple Textbox) below the normal Column Text for
searching purposes. Something like that:
| Header 1| Header 2 |
| SEARCHBOX | SEARCHBOX |
---
|ROW 1
--
|ROW 2
As soon as the user types in a character into the SearchBox a
RangeChangeEvent is fired which leads to a server requests and the CellTable
is updated with the new filtered list.
Basically everything works fine.
However as soon as the CellTable is refreshed (after typing in a character
into the searchbox) also the SearchBox loses its focus and the user has to
click with the mouse again into the SearchBox which is a little bit clumsy.
This is probably related to the fact that the render method of the custom
header and its cell is called after the CellTable refresh. Is there any way
how to set the focus back to the SearchBox? I tried to set tabindex=0 but it
didn't help.
The important code is in the SearchCell class. In override the
onBrowserEvent function and in the *keyup *part I set the boolean flag
isChanged = True. In the *blur *part I set it back to False. How can I check
this flag and set the focus on the SearchBox again?
*Custom Header Class:*
public static class SearchHeader extends HeaderSearchTerm {
@Override
public void render(Context context, SafeHtmlBuilder sb) {
super.render(context, sb);
}
private SearchTerm searchTerm;
public SearchHeader(SearchTerm searchTerm,ValueUpdaterSearchTerm
valueUpdater) {
super(new SearchCell());
setUpdater(valueUpdater);
this.searchTerm = searchTerm;
}
@Override
public SearchTerm getValue() {
return searchTerm;
}
}
*Custom Search Cell (used in the custom Header)*
*
*
public static class SearchCell extends AbstractCellSearchTerm {
interface Template extends SafeHtmlTemplates {
@Template(div style=\\{0}/div)
SafeHtml header(String columnName);
@Template(div style=\\input type=\text\
value=\{0}\//div)
SafeHtml input(String value);
}
private static Template template;
private boolean isChanged = false;
public SearchCell() {
super(keydown,keyup,change,blur);
if (template == null) {
template = GWT.create(Template.class);
}
}
@Override
public void render(com.google.gwt.cell.client.Cell.Context context,
SearchTerm value, SafeHtmlBuilder sb) {
sb.append(template.header(value.getCriteria().toString()));
sb.append(template.input(value.getValue()));
}
@Override
public void onBrowserEvent(Context context,Element parent,
SearchTerm value,NativeEvent event,ValueUpdaterSearchTerm valueUpdater) {
if (value == null)
return;
super.onBrowserEvent(context, parent, value, event,
valueUpdater);
if (keyup.equals(event.getType()))
{
isChanged = true;
InputElement elem = getInputElement(parent);
value.setValue(elem.getValue());
if (valueUpdater != null)
valueUpdater.update(value);
}
else if (blur.equals(event.getType())) {
isChanged =false;
}
}
protected InputElement getInputElement(Element parent) {
Element elem =
parent.getElementsByTagName(input).getItem(0);
assert(elem.getClass() == InputElement.class);
return elem.cast();
}
}
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Re: OutlineView Widget
You could use the CellTree Widget and create an implementation of the AbstractCell where you override the render method and create this kind of structure. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/tJmWlmJ2MlUJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: pass variable from JavaScript to GWT
Your JSNI call looks fine.
However if you try to run the Java function from outside the GWT context,
then you have to build a bridge (
http://code.google.com/webtoolkit/doc/latest/DevGuideCodingBasicsJSNI.html#calling
)
Try to debug it with some alert('xyz') statements.
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Aw: GWT Visualization Performance/Optimization
We were using 5 scatter charts each of them displaying around 2000 points and it worked pretty well and it didn't really take long to render it (maybe a sec oder so). The Google Visualization scatter charts use SVG which doesn't scale that well with increasing number of objects. If performance is really important you can try to use a scatterplot which is based on canvas. We successfully switched from the google visualization scatter charts to dygraph (http://dygraphs.com/). Dygraph is based on cavnas and performs really good and hase also zooming and other useful features. They even support Google Visualization DataTable as datasource. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Use of processing.js with GWT
Yes I am using processing.js with GWT. I wrote a simple GWT wrapper for processing.js you can check it out here: https://github.com/timeu/processing-js-gwt There are three ways to load processing code (you have to call them on the instance of the wrapper): load(ExternalTextResource code ,final Runnable onLoad) loadFromUrl(String url,final Runnable onLoad) load(String code,final Runnable onLoad) *The onLoad Callback will be called as soon as the processing code is loaded. * * * *There is also an abstract *ProcessingInstance *class for interaction with the Processing code. * * * *Hope this helps* -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Feedback on different backends for GWT
feedback. Maybe somebody has experience with both backend or with that use case. thanks in advance Uemit -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Need Feedback on charts frameworks for GWT
I think it doesn't make any difference if you use MVP architecture or not for charts. You will treat them as any other widgets. If you need default charts (scatterchart, barchart, etc) I can recommend to use google's visualization API ( http://code.google.com/apis/charttools/index.html). For time-series charts I use Dygraphs (http://dygraphs.com/) and I forked the project and modified it a little bit so I can also use it as a scatterchart. There are some other charting libraries but for most of them you have to write your own GWT wrappers or directly interact with JSNI: SVG: http://raphaeljs.com/ http://vis.stanford.edu/protovis/ http://www.highcharts.com Canvas: http://dygraphs.com/ http://www.rgraph.net/ http://www.zingchart.com/flash-and-html5-canvas/ -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: math performance
You can check the compiled code and see how the mathematical calculations are translated into javascript. For these kind of complex calculations the Native Client SDK ( http://code.google.com/p/nativeclient-sdk/) would be a perfect fit but unfortunately it is only supported in the latest chrome version. But I generally agree that nowadays client processing power is really no issue and as the performance of the javascript engines significantly increase from version to version it definitely makes sense to make use of that. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: One Session(HTTP) for multiple GWT-Modules?
It depends how session management is done on the client. If you use cookies to store the session id it should make no difference as long as you communicate with the same domain (Cookies are domain specific). If you open gmail in two tabs in your browser you won't have to authenticate twice only one time right?. Both gmail instances will share the session. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: GWT Graphics (SmartGWT)
There are several ways to solve that. 1.) Doing it HTML way (the way you did it). I am not sure why it takes 20 seconds (btw how did you create the rectangles?). You might look into the cell widgets ( they provide better performance for dynamically creating large amounts of cells). 2.) SVG Graphics. There are some 3rd party libraries (like RaphaelJS) you can use or if its really just rectangles you can create it yourself easily. Advantage of SVG is vector graphics (scaling) and easy to implement handlers on the objects (i.e. clickhandler on seat). However SVG might not scale well with large amounts of objects because you have to deal with 5000 DOM objects (for each seat one svg element) though there might be some workaround for that (re-using similar objects, etc). 3.) Canvas. Probably scales best with large number of objects. However dealing with eventhandlers is not as easy as with SVG or HTML. GWT 2.2 introduces the canvas API (so you could use it natively in GWT). Alternatively there are also some 3rd party libraries (processingjs, etc). Disadvantage with SVG and Canvas is browser compatibility especially with IEs. In GWT 2.2 the canvas API only supports I.E 9.0 (chrome safari and firefox work fine). ExCanvas provides support for I.E. 0.9 but you have to incorporate it yourself and performance is not really that good. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Highcharts - updating chart with data
A couple of things: 1.) I am not sure if it is possible to access the series array of the JavaScriptObject instance option, the way you have done it. In hosted mode it should complain that there is no field series in options because options is a generic JavaScriptObject. 2.) You probably have to make sure the options instance you store in your wrapper is the same object as the actual one which is stored in the Highcharts chart instance. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Deferred Binding, Gin in library/widget ?
But in case I use a app-wide URL I still have to inject the URL into my DataSource class right? I could use Field Injection but isn't constructor injection the recommended way to do it ? I think it boils down to the question: What is the best practice if you want to develop a standalone library which doesn't care if the user uses DI or any other method to pass resources and dependencies into my library classes? Sorry that I repeat the question but do I have to annotate the constructor with @Inject if I want to allow for constructor based DI or is there any other way (to avoid dependency to the guice/gin in my library)? Thanks in advance cheers Uemit -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Deferred Binding, Gin in library/widget ?
@Brian: I agree, after thinking a little bit more about that problem and taking your comments into account I think that deferred binding might not be really suitable for my use case. I also agree that the best approach is to set the datasource in the constructor thus enabling users to use Dependency injection if they want. But do I have to annotate the constructor with @Inject in order to allow for DI ? (because in that case I would create a dependency to gin and guice in my standalone library which i want to avoid). -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Deferred Binding, Gin in library/widget ?
Hi Phillipe Thanks for the interesting comments. I am still trying to fully understand dependency injection and sometimes I am not sure that I have ;-) I agree that dependency injection is more powerful and flexible compared to deferred binding. So the three cases you described apply when I want to mix deferred binding with DI? After thinking a little bit about my problem and taking Biran's previous comments into account I decided against deferred binding and for designing the API so it can be used with DI (dependency injection). I haven't really decided whether the url is going to be an application wide resources or if it can be set to different values on an instance base. But does it really make a difference in regards to DI? In both cases I would try to inject the URL as a constructor injection? (I could use annotated dependency injection for different URLs in the app I guess?) The HttpDataSource class is a special implementation of the DataSouce and doesn't necessary mix with different datasource implementations. For example I might add a HTML5 LocalStoreDataSource which doesn't need an URL ressources but might take something else in the constructor. In your opinion what is the best DI setup for this use-case? And do I have to annotate my DataSource constructors with @Inject if I want to enable DI? This would create a dependency to GIN/GUICE in my library which I want to avoid. thanks in advance Uemit -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Deferred Binding, Gin in library/widget ?
@Brian I see your point but I am not entirely convinced yet that using either GIN/deferred binding might not be beneficial for my use case. Just for the record: I think it makes sense to allow the user to choose the specific datasource implementation at compile time, because once the datasource is set it isn't changed throughout the application (at least for an instance of my widget). Of course users of the widget/library should be able to implement their own datasources. But then again they can define it for a widget at compile time. I also plan to provide say 3 different datasource implementations packaged with my library/widget. Of course it is possible to use setDataSource() to set the datasource but isn't it nicer and easier to test if I use GIN to inject the DataSource ? Maybe deferred binding is probably too much overkill for that use case (tough it also used in the gwt-log library to configure different Loggers) , especially if you might have different instances of that widget in your applications which might use different datasource implementations (deferred binding would only allow one type of datasource implementation). However using dependency injection might be a compromise. I could use annotations to inject different datasource implementations. Not sure if that makes sense. cheers Uemit -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: JSNI and Generic Types
I tried the JSNI call that Thomas suggested and it works (GPE doesn't display any errors and it also compiles fine): @mycustomnamespace.event.CustomHighlightEvent::fire(Lcom/google/gwt/event/logical/shared/HasHighlightHandlers;L java/lang/Object;)(view,data); So I replaced my DTO type *Lmycustomnamespace.model.MyCustomDTO; *with *L** java/lang/Object; * I am not sure why GPE does't autocomplete that correctly but in case somebody has the same issue, just replace the autocompleted generic types with the erased ones (thanks Thomas for the hint). cheers Uemit -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
JSNI and Generic Types
Hi everyone
I am trying to implement a custom HighlightEventHandler for a GWT wrapper
for a third party visualization library and I run into some problems
concerning JSNI and generic types. Let me try to explain.
I want to implement a CustomHighlightHandler for my wrapper. GWT already has
a HighlightHandler interface which uses a generic type to allow
customization. So I am going to extends these interfaces to implement my
custom highlight handler.
The main classes/interfaces look like this:
CustomHighlingtHandler:
public interface CustomHighlightHandler extends
HighlightHandlerCustomHighlightEvent{
}
CustomHighlightEvent:
public class CustomHighlightEvent extends HighlightEventMyCustomDTO {
protected HighlightGeneEvent(MyCustomDTO highlighted) {
super(highlighted);
}
}
So in my wrapper I have to wire the events with my third party visualization
library. I have to use JSNI to do that and here I run into problems:
I use following JSNI code to wire up the EventHandler:
public final native void sinkNativeEvent(HasHandlers view) /*-{
var callback_func = function(data) {
var dataDTO =
@mycustomnamespace.model.MyCustomDTO::new(Ljava/lang/String)(data;
@mycustomnamespace.event.CustomHighlightEvent::fire(TS;TV;)(view,dataDTO);
}
this.api_addEventHandler(callback_func);
}
So if I use the inherited static fire function from gwt's HighlightEvent the
compiler complains that the JSNI call has non valid parameters . So it seems
that Generic types are not supported by JSNI. Is that right?
A workaround for that problem is to define an additional static fire
function in my CustomHighlightEvent which have non generic types as function
parameters and use that in the JSNI:
add this function to CustomHighlightEvent:
public static void fire(HasHighlightHandlersMyCustomDTO source,MyCustomDTO
data) {
CustomHighlightEvent event = new CustomHighlightEvent(data);
source.fireEvent(event);
}
and in the JSNI I can then use following call:
@mycustomnamespace.event.CustomHighlightEvent::fire(Lcom/google/gwt/event/logical/shared/HasHighlightHandlers;Lmycustomnamespace.model.MyCustomDTO;)(view,data);
I am not sure if thats the best workaround or what's the best approach for
this?
thanks in advance
Uemit
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Re: JSNI and Generic Types
@Thomas: Thanks for the quick response. The Google Plugin for Eclipse actually does suggest/autocomplete to @mycustomnamespace.event.CustomHighlightEvent::fire(*TS;TV;* )(view,dataDTO); I assume it does so because I call the static fire method of the HighlightEvent class which looks like this: public static V,S extends HasHighlightHandlershttp://google-web-toolkit.googlecode.com/svn/javadoc/1.6/com/google/gwt/event/logical/shared/HasHighlightHandlers.htmlV HasHandlershttp://google-web-toolkit.googlecode.com/svn/javadoc/1.6/com/google/gwt/event/shared/HasHandlers.html void *fire*(S source,V highlighted) The compiler complains that I have to use valid parameters for JSNI.(haven't tried in production mode tough). If I change the parameters of the static fire method manually to the actual types that I use (* Lcom/google/gwt/event/logical/shared/HasHighlightHandlers;Lmycustomnamespace.model.MyCustomDTO; *) GPE marks the line with an error (can't find method *fire *with the specific parameters). To be honest I haven't tried to run the code regardless of the GPE error. I will try tomorrow and report my findings. So if I understand it correctly. In JSNI methods I have to replace any references to generic types with the actual types. GWT/Java compiler replaced the generics with the coresponding types during compile time and because JSNI is basically something like compiled code, it doesn't know what to do with the generic types? -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Deferred Binding, Gin in library/widget ?
Sorry for the thread bump: So I was thinking a little bit more about this problem. Both GIN and deferred binding respectively allow for customization of the widget's datasource during compile time. With gin I have a litte bit more flexibility (creating factory, singleton, etc)? For my personal taste the nicer/cleaner approach seems to be to use deferred binding to configure it. Is it actually possible to allow both? Configuration by either deferred binding or gin? And I still don't know how to solve the problem wiith the non-default constructor with either gin or deferred binding. In case of gin I might use a Factory but I am not sure if there is not a better approach. thanks in advance Uemit -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Network visualization with GWT
Apparently somebody wrote a small wrapper for InfoVis: https://groups.google.com/forum/#!searchin/javascript-information-visualization-toolkit/GWT/javascript-information-visualization-toolkit/8F3MmHz6-rA/h_a7Thtg07kJ http://weltermann17.wordpress.com/2009/07/02/jit-gwt-a-low-cost-solution-2/ But as far as I know InfoVis uses canvas so it won't fit the requirements. Alternatively you could use Protovis (http://vis.stanford.edu/protovis/) or Raphael (http://raphaeljs.com/) but I don't think they provide a GWT wrapper. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Network visualization with GWT
@Thomas: You are right. It uses excanvas.js so it should also work with IE 9.0 versions. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Deferred Binding, Gin in library/widget ?
Hi everyone
I am struggling a little bit with the concept of deferred binding and/or
dependency injection in libraries/widgets.
I try to come up with the best approach for following problem:
I implemented a visualization widget (composite) that takes in some data and
displays it.
I want to separate the way the data is retrieved from the actual
visualization part. So I added a generic interface DataSource which looks
like this:
public interface DataSource {
public void fetch(int start, int end, boolean getFeatures,
GeneomeDataSourceCallback callback);
}
and I add a setter to my Widget: public void setDataSource(DataSource
source) { this.source = source}
In oder to support http like datasources I also added an abstract class
which implements the DataSource Interface and takes an URL in its default
constructor:
public abstract class HttpDataSource implements DataSource {
protected String url;
public HttpDataSource(String url) {
this.url = url;
}
}
My specific DataSouce extends this abstract class and implements the fetch
method of the interface:
public class MyDataSource extends HttpDataSource {
public MyDataSource(String url) {
super(url);
}
}
This works well. I can create an instance of the MyDataSource class pass it
to the setter of my widget.
Now I want to make the widget somewhat configurable. I know that this can be
done by either Dependency Injection or Deferred Bindings.
So one approach would be to allow the user of the widget to set the
DataSource in the Module XML file (similar to the way it is done in the
gwt-log library:
http://code.google.com/p/gwt-log/source/browse/trunk/Log/src/com/allen_sauer/gwt/log/gwt-log-impl.gwt.xml
)
replace-with class=MyDataSource
when-type-is class=DataSource /
when-property-is name=source value=MyDataSourceName /
/replace-with
However I don't know if that is possible because by passing a url into the
constructor of MyDataSource I have a state and I am not sure how this works
with deferred binding.
On a side note: would it be possible to have the url also configured in the
module's XML file?
I am also worried if people who use this widget/library can implement their
own DataSource and pass it to the widget (doesn't it interfere with the
deferred binding?)
I suppose another solution would be using dependency injection in the parent
application which uses the visualization widget/library ( how can the url be
passed, etc? I probably have to inject a Factory?)
Which one of these two solutions is better and in general does it make sense
to use deferred binding or GIN to solve this problem?
thanks in advance
Uemit
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