I have a confusion that only button element shows option for command and most of the other elements do not support this option.
Is it valid only for Button?
And is only Click Event handled by Command?? Because most of the samples i have seen, On clicking button command gets fired.
In case i want command to be fired on other events, then what to do?
Yes, there are some limitations like above. A command cannot be bound with the controls that doesn't implement ICommandSource interface. But you can use Dependency Property to write custom commands.
You can see this and this or googling for more examples.
Related
I'm working through the Code With Chris card matching game and when setting up the animation, he presses "." to bring up a list of options to select from. When I do the same thing my list of things to select from is different. I tried putting in the text manually but Xcode doesn't recognize it. What am I doing incorrectly?
Because the tutorial is calling UIView.animate but you are calling UIView.animateKeyFrames. Those are different methods and take a different set of options.
(There have also been some changes in the code completion interface since that tutorial was created.)
I am trying to remove the 'Details' button from the following ProgressMonitorJobsDialog:
I am running a org.eclipse.core.runtime.jobs.Job that opens the default Dialog. I have seen examples here of disabling the Cancel button, but I need to remove the third one and extending the default ProgressMonitorJobsDialog won't help, since it is invoked by the default UIJob class. Any ideas?
This dialog is usually ProgressMonitorFocusJobDialog displayed by ProgressManager. It isn't really possible to change the dialog without using internal APIs.
Instead of a Job you could use an IRunnableWithProgress and use ProgressMonitorDialog to run it. This dialog does not have the Details section.
I'm currently writing a plugin for the Eclipse IDE. In this plugin, I defined my own type of resource marker (IMarker). Using the standard Eclipse means like the "Next annotation"/"Previous annotation" buttons, the user has the possibility to navigate between these markers. I also wrote a view which shows some detail information for a single marker. This view shall be updated when the user navigates to a marker. Can I register some kind of listener/observer that will be notified when the user selects/jumps to a marker? If so, how? If not, what are my alternatives?
The Next Annotation action ends up calling the ITextEditorExtension4.gotAnnotation method. The usually implementation for this is in AbstractTextEditor. This just calls finds the annotation and calls the selectAndReveal method.
So there does not seem to be any special listener you can use for this. Normal selection events should be generated so you could use the ISelectionService selection listener but you will have to work out if the selection is for your marker.
I was reading the documentation of the .on event handler of jQuery and I started playing around with it.
I have a simple <select> element with the multiple attribute set to true.
However, I want the user to be able to select multiple items without having to press the ctrl or shift key(s)
According to the .on documentation, if you specify a selector it will automatically add those event handlers to any new items added inside that container that match the selector specified.
So in my case, I could for example decide to replace the <option> elements available in the listbox, but I still want to have the same functionality for those options without having to rebind those events etc.
One might think that the following snippet should do the trick (atleast, I did):
$('#dropdownlist').on('mousedown', 'option', function(e){
e.preventDefault();
$(this).prop('selected', $(this).prop('selected') ? false : true);
return false;
});
So when a users clicks on an option in that listbox, the default action will be cancelled and depending wether the item is already selected or not, it will invert that selection.
I have created a small fiddle demonstrating this behaviour: fiddle
In that fiddle, the first dropdownlist is behaving as expected, but the functionality is lost when replacing the items. This only works in FF & Chrome.
The second dropdownlist is how I thought it should've been (event handling wise), but that doesn't seem to work besides in Chrome -.-
The functionality is kept when replacing items, because the console will still log '2' when clicking on an item after replacing them.
Can someone explain me why this is happening? Am I doing something wrong?
Please point me in the right direction!
Thanks!
~ Dirk
IE doesn't respect the mousedown event on the option tag itself. You've got to use the OnChange event of the select tag, which is not what you (nor I) want. I was trying to do the exact same thing as you and was stopped at every attempt. I finally gave up and made it a list of checkboxes because I can get the same behavior out of mine that you are trying to do here.
You can see this question for some options, but I never did get it to work the way you are describing.
I created the menu item in the "File" menu as a command. For this command there is a handler implementing the IHandler interface. This handler contains the isEnabled method. I am trying to use this method to enable/disable my menu item, but that method is called only once when I click on the "File" menu. When clicked for the second, third etc. times, the isEnabled method is not called again even if I changed the state of page (open/close editors) before.
What should I do? Maybe this method is not intended for control menu items?
Are you subclassing org.eclipse.core.commands.AbstractHandler? You should use setBaseEnabled(boolean) to update the state of your handler (which would update your command).
It's only valid to change enabled state in your handler as long as you also fire the HandlerEvent. It's usually easier to call setBaseEnabled(boolean) which will fire the event for you.
If you're trying to enable/disable the menu, than you should use core expressions.
I've already explained how to do that in this answer:
Eclipse RCP menus & actions: Configure or code?
The part that you're interested in starts with:
For activating/deactivating a menu[...]
I hope this is what you're looking for.