I am using DirectShow.NET library [ http://directshownet.sourceforge.net/ ] and I use below code in order to show video streams.
videowindow.put_Owner(handle);
videowindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren);
videowindow.put_WindowState(DirectShowLib.WindowState.Show);
Note: The handle is System.Windows.Forms.UserControl handle [ this->Handle]
The problem is that:
In my user control the video frames are not shown properly: I see half
of the video frame and the other half is out of screen.
Also when I scale my user control, the video stream frames are not
scaled.
What may cause this ? How can i fix it?
Update:
Based on Roman Answer I added following code:
videoWindow.SetWindowPosition(this.ClientRectangle.Left,
this.ClientRectangle.Top,
this.ClientRectangle.Width,
this.ClientRectangle.Height);
And Now I can able to see video frame in my user control rectangle properly....
Additionally to putting video renderer's window as a child control and providing window stypes, you should be setting IVideoWindow.SetWindowPosition. You are also responsible to update it when layout of your window changes.
Related
Question
I'm working with Adobe Scene7 BasicZoomViewer and I'm looking for a way to tell the ZoomViewer to reset the zoom so that the user is no longer zoomed in on an image but instead will show the default "zoom" level.
What I've found
The closest thing I found to what I need is this reset property ZoomView.reset which "Resets the viewport when the frame (image) changes. If set to 0 it preserves the current viewport with the best possible fit while preserving the aspect ratio of the newly set image".
This looks close to something I need but it states that it will reset or preserve the aspect ratio when a new image has been inserted but I am not inserting new images.
Demo from Adobe
There is a button on the image that the API inserts into the page that resets the zoom level. Adobe provides a demo page that shows what I'm working with. If you look at the bottom left, the right-most button is the reset button. When clicked, it has to make some kind of API call and I need to figure out which one it is.
Edit
I've been able to find a minified version of the BasicZoomViewer and I am currently attempting to make sense of the code.
There is an event listener placed on the "Zoom Reset Button" that just simply calls a reset() method on line 274 in the uglified version of the file. Currently, I am trying to make sense of the file and figure out how to access this method.
c.zoomResetButton.addEventListener("click", function () {
c.zoomView.zoomReset()
});
I will be answering my own question. If someone finds a better way please feel free to answer as well.
tldr;
Create a variable to hold the instance of your s7viewers.BasicZoomViewer() and inside of that you can access the event handlers and much more.
Example of calling the reset zoom handler
// instantiate the s7viewers class and save it in a variable
var s7BasicZoomViewer = new s7viewers.BasicZoomViewer({
containerId: 's7viewer',
params: {
asset: assetUrl,
serverurl: serverUrl
})
// example of how to call the "zoomReset()" method
s7BasicZoomViewer.zoomResetButton.component.events.click[0].handler()
Explanation
After digging through the minified code that was uglified I found an event listener on the s7zoomresetbutton DOM class name, or perhaps it's watching for the ID of that DOM element which is the same ID as the container div for your S7 BasicZoom Viewer plus some added text to make this ID unique. For example, if the container div is s7viewer then the reset zoom button will have an ID of s7viewer_zoomresetbutton.
Now, going through the code I found this event listener which let me know there must be some way to call the zoomReset() method.
c.zoomResetButton.addEventListener("click", function () {
c.zoomView.zoomReset()
});
In the code above, the value of c is this or in other words it's the instance of your S7 BasicViewerZoom and in my case I have multiple depending on how many images I need to zoom on.
When instantiating the s7viewers class you can then reference that instance later and access the event handlers on each button and other properties and methods.
From there it was just looking through the object returned from the instance and calling the handler for the reset button.
So I would like to be able to have a print button for entries in our database so users can print an entry via a print friendly "form".
My thought was to create a separate page, add labels and have those labels pull the relevant information.
I know I can add the open widget information via this code:
app.datasources.ModelName.selectKey(widget.datasource.item._key);
app.showPage(app.pages.TestPrint);
But I'm running into a few problems:
I can't get the page to open in a new window. Is this possible?
window.open(app.pages.TestPrint);
Just gives me a blank page. Does the browser lose the widget source once the new window opens?
I can't get the print option (either onClick or onDataLoad) to print JUST the image (or widget). I run
window.print();
And it includes headers + scroll bars. Do I need to be running a client side script instead?
Any help would be appreciated. Thank you!
To get exactly what you'd want you'd have to do a lot of work.
Here is my suggested, simpler answer:
Don't open up a new tab. If you use showPage like you mention, and provide a "back" button on the page to go back to where you were, you'll get pretty much everything you need. If you don't want the back to show up when you print, then you can setVisibility(false) on the button before you print, then print, then setVisibility(true).
I'll give a quick summary of how you could do this with a new tab, but it's pretty involved so I can't go into details without trying it myself. The basic idea, is you want to open the page with a full URL, just like a user was navigating to it.
You can use #TestPrint to indicate which page you want to load. You also need the URL of your application, which as far as I can remember is only available in a server-side script using the Apps Script method: ScriptApp.getService().getUrl(). On top of this, you'll probably need to pass in the key so that your page knows what data to load.
So given this, you need to assemble a url by calling a server script, then appending the key property to it. In the end you want a url something like:
https://www.script.google.com/yourappaddress#TestPage?key=keyOfYourModel.
Then on TestPage you need to read the key, and load data for that key. (You can read the key using google.script.url).
Alternatively, I think there are some tricks you can play by opening a blank window and then writing directly to its DOM, but I've never tried that, and since Apps Script runs inside an iframe I'm not sure if it's possible. If I get a chance I'll play with it and update this answer, but for your own reference you could look here: create html page and print to new tab in javascript
I'm imagining something like that, except that your page an write it's html content. Something like:
var winPrint = window.open('', '_blank', 'left=0,top=0,width=800,height=600,toolbar=0,scrollbars=0,status=0');
winPrint.document.write(app.pages.TestPage.getElement().innerHTML);
winPrint.document.close();
winPrint.focus();
winPrint.print();
winPrint.close();
Hope one of those three options helps :)
So here is what I ended up doing. It isn't elegant, but it works.
I added a Print Button to a Page Fragment that pops up when a user edits a database entry.
Database Edit Button code:
app.datasources.ModelName.selectKey(widget.datasource.item._key);
app.showDialog(app.pageFragments.FragmentName);
That Print Button goes to a different (full) Page and closes the Fragment.
Print Button Code:
app.datasources.ModelName.selectKey(widget.datasource.item._key);
app.showPage(app.pages.ModelName_Print);
app.closeDialog();
I made sure to make the new Print Page was small enough so that Chrome fits it properly into a 8.5 x 11" page (728x975).
I then created a Panel that fills the page and populated the page with Labels
#datasource.item.FieldName
I then put the following into the onDataLoad for the Panel
window.print();
So now when the user presses the Print Button in the Fragment they are taken to this new page and after the data loads they automatically get a print dialog.
The only downside is that after printing the user has to use a back button I added to return to the database page.
1.
As far as I know, you cannot combine window.open with app.pages.*, because
window.open would require url parameter at least, while app.pages.* is essentially an internal routing mechanism provided by App Maker, and it returns page object back, suitable for for switching between pages, or opening dialogs.
2.
You would probably need to style your page first, so like it includes things you would like to have printed out. To do so please use #media print
ex: We have a button on the page and would like to hide it from print page
#media print {
.app-NewPage-Button1 {
display : none;
}
}
Hope it helps.
1. Here is how it is done, in a pop up window, without messing up the current page (client script):
function print(widget, title){
var content=widget.getElement().innerHTML;
var win = window.open('', 'printWindow', 'height=600,width=800');
win.document.write('<head><title>'+title+'/title></head>');
win.document.write('<body>'+content+'</body>');
win.document.close();
win.focus();
win.print();
win.close();
}
and the onclick handler for the button is:
print(widget.root.descendants.PageFragment1, 'test');
In this example, PageFragment1 is a page fragment on the current page, hidden by adding a style with namehidden with definition .hidden{display:none;} (this is different than visible which in App Maker seems to remove the item from the DOM). Works perfectly...
2. You cannot open pages from the app in another tab. In principle something like this would do it:
var w=window.parent.parent;
w.open(w.location.protocol+'//'+w.location.host+w.location.pathname+'#PrintPage', '_blank');
But since the app is running in frame nested two deep from the launching page, and with a different origin, you will not be able to access the url that you need (the above code results in a cross origin frame access error). So you would have to hard code the URL, which changes at deployment, so it gets ugly very fast. Not that you want to anyway, the load time of an app should discourage you from wanting to do that anyway.
I made a simple program with two forms. the first form is small, the second one is large.
I already handled the screen resolution thing so the scroll is working and I tested the application on many screen sizes and resolutions.
my problem is this:
when I go from the first form to the second form, the second form doesn't start from the top left of the screen so the result is this:
I have to drag it to the top to see the two buttons at the bottom like this:
my question is: is there a way to make this form starts as in the second image, not the first one?
There is a proprety called StartPosition with it you can define the startup position of a form
PS : if you want a costum position for exemple if you wan it to be in the coordinate : X=15 and Y =20
in the FormLoad Event (double click the form ;) ) put this :
Form1.Location = new Point(15, 20);
OR THIS :
Form1.Top=20;
Form1.Left=15;
Forms.StartPosition is the property to work with.
Usually setting it to CenterParent or CenterScreen should work well for your requirement.
Instead if you want to fine tune the position of the form then you should set the property to Manual and then work with the Location property (a Point structure) calculating the correct location desidered.
Also, keep in mind that if you want to manually work with Location and Size of the form you should do it overriding the OnLoad event, as explained in this question
I'm maintaining an ASP.NET site where users can log on to register some set of data (for statistical purposes). One user registers data for a set of units, and for each of these units a set of forms are to be filled out (with a handful of fields in each form, but that doesn't matter here). One scenario is that a user has 12 units, and in each of these units there is 25 forms to be filled, meaning a total of 300 forms.
The ASP.NET page for registering these data is made the following way: each form is in a panel that can be collapsed using an AjaxControlToolkit CollapsiblePanelExtender, and all forms in a unit is inside another panel that also can be collapsed. The result is that you have a tree view-like structure with the units on the top, and under each unit you can expand a set of forms, and further each form can be expanded to fill data (the page is loaded with all panels collapsed by default).
The page is generated completely dynamically (as forms can be added in a database), and for generating the CollapsiblePanelExtenders I have the following code:
private CollapsiblePanelExtender GenerateCollapsiblePanelExtender(string id, Panel headerPanel, Panel contentPanel)
{
CollapsiblePanelExtender collapsiblePanel = new CollapsiblePanelExtender();
collapsiblePanel.ID = id + ID_COLLAPSIBLE_PANEL_POSTFIX;
collapsiblePanel.TargetControlID = contentPanel.ID;
collapsiblePanel.CollapseControlID = headerPanel.ID;
collapsiblePanel.ExpandControlID = headerPanel.ID;
collapsiblePanel.Collapsed = true;
collapsiblePanel.BehaviorID = collapsiblePanel.ID + ID_BEHAVIOUR_POSTFIX;
return collapsiblePanel;
}
With one user having 12 units each with 25 forms, this means a total of 312 CollapsiblePanelExtenders. As I said, they are all set to be collapsed by default, but here's the problem:
When the page loads, they all appear to be expanded, and then the browser "starts collapsing them". This however takes a very long time (in Firefox I even get a warning about an unresponsive script, IE and Chrome only takes forever but without the warning). When all the "collapsing" is complete it works smooth to open and close single panels, but users have complained about the extremely slow initial loading.
So my question is simple: is there a way to optimize this so that the loading goes smoother? Is it for instance possible to only load the header panels in each CollapsiblePanelExtender initially, and then load the content panel asynchronously in some way?
One final clarification:
I know I could simply change the design of the page to only include one unit and thus reducing size of the contents drastically, but I hope to avoid this (users prefer the way with everything in one page). It would also mean a rather large change to the logic of the page (yes, I know - it's a poor code base at that point)
After asking some more around other places, I finally managed to solve this issue. The solution was to skip the CollapsiblePanelExtenders altogether, and instead use jQuery to handle the collapsing/extending.
In my structure, all header panels use the css class HeaderPanel, and all content panels use the css class ContentPanel (all of these are hidden by default). I can then use the following script to handle all the collapse/expand logic:
<script language="javascript">
$(document).ready(function() {
$("div.HeaderPanel").toggle(
function() {
$(this).next("div.ContentPanel").show("slow");
},
function() {
$(this).next("div.ContentPanel").hide("slow");
});
});
</script>
The solution was really quite simple, and it works like a charm! The collapsing/extending is soo much smoother and nicer than what it looked like when I used the CollapsiblePanelExtenders, and the page loads really fast as well :)
I have a flex 3 application that creates an Image from a canvas which the user draws on. I use the ImageSnapshot class to create the image
var imageSnap:ImageSnapshot=ImageSnapshot.captureImage(myCanvas);
var imageByteArray:ByteArray=imageSnap.data as ByteArray;
I want the user to be able to print or save the image. I can use the following code to print the image but flex does not provide good control over printing across multiple pages
var printJob:FlexPrintJob=new FlexPrintJob();
printJob.start();
printJob.addObject(myCanvas, FlexPrintJobScaleType.SHOW_ALL);
I would like to display the image in a browser window so that the user could print it using the built in browser functionality or right click on the image and save it. Can this be done without requesting server side code to do it?
I know that flash player 10 and flex 4 allow you to save files locally but for now I am stuck with player 9 and flex 3
You can still use the new features of FileReference (the save() and load() methods) in Flex 3 as long as the application is running in Flash Player 10. But if you are definitely stuck with Flash Player 9 then you will need to push the image up to the server first. If you are looking for a good way to push that data up to the server, please reference my solution in this question:
Flex: Render an unrealized UIComponent to BitmapData?
I don't believe you can do this, as it would violate the sandbox. For example, if this worked, it means you could put arbitrary code (analogous to an image) on the user's machine without their consent or knowledge.
I'm not sure if this will work, but try this:
Show a link to the image (file://path/to/image/img.ext) and set window.htmlLoader.navigateInSystemBrowser = true;