I find GtkEntry has a default context menu
But I really do not want it, how can I disable it
I googled but no effective way found
Did you try to just hide/unref/destroy the wigdet passed (the GtkMenu being spawned) within a signal handler hooked to populate-popup?
Another option would be to filter out all right click events by hooking up to GtkWidget's (actually yout GtkEntry which is a subclass of GtkWidget) clicked signal and returning TRUE (for being handled)
Related
As it is referenced in MATLAB documentation for edit box uicontrol or stated in this
post, when another component or menu bar or background GUI is clicked, the edit box callback gets executed. But in my attempts to use this functionality, I haven't been able so far to see the callback execution unless there is a change of edit box text or Enter key is pressed. What I'm trying to achieve is to execute edit box callback whenever there is focus loss from edit box even when nothing has been entered. Please enlighten me about what I'm missing here and how I can do this?
Thanks in advance.
The underlying Java object has a callback called FocusLostCallback that'll do what you want - execute when the object's focus is lost, even if you changed nothing.
You'll need findjobj from the MATLAB File Exchange. Then, get the Java handle and set the callback as usual (make sure the uicontrol is visible when you try to get the Java handle):
jh = findjobj(myEditBox); % myEditBox is a uicontrol handle
set(jh, 'FocusLostCallback', #myCallback);
A more complete list of the undocumented uicontrol callbacks can be found at Yair Altman's Undocumented MATLAB blog.
This method work perfectly with single-line textbox, but it has any effect with multi-line textbox (uicontrol, style edit, max = 2)
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.
As I need to specify a local variable to a Subsystem, I created a mask. Doing that I lose the easy access to the subsystem. Right-click and navigating to "Look under mask" is supposed to be too complicated.
So I thought about a workaround and built the following:
The dialog callback code behind the "Get deeper!" checkbox is:
myParameter = %Parameter set by checking Get deeper!
path = gcb(gcs);
if strcmp(get_param(gcb,'myParameter'),'on')
open_system(path,'tab');
end
Everytime when I check the box, the subsystem gets opened and also by every double click on the subsystem, in case the box was checked before. Hence the code does what it should, but thats actualy not the common way how one would realize/visualize something like this.
What I want is a button "Look under mask" in my mask - so the subsystem just gets opened by clicking on that button. Basically the button should call the function: open_system(gcb(gcs),'tab'). Looks so easy, but Simulink doesn't offer me any option to implement this. Can anybody help?
The main issue whith the current solution is also that with every execution of the model all subsystems open up, where the box is checked. That's not the idea.
Matlab 2012b adds exactly what you want: masked blocks have a button on the botton left that is a shortcut to "Look under mask".
Unfortunately, I don't think it is possible to add a button in a mask.
You may want to change your function to automatically set the "Get deeper!" checkbox off after the user clicks on it. That would avoid the automatic opening of the subsystems when the model is loaded. You could do that adding set_param(path,'myParameter','off') just after the open_system(path,'tab');
Finally, as another workaround, you may want to set the OpenFcn callback to call open_system(gcb,'tab'). This will make the system work as if it isn't masked at all. You can put two open_system calls, one to look under mask and the other to open the mask dialog box, if you prefer.
Is there an elegant way to expand/collapse the items in a GtkTreeView using the keyboard (say, the Enter key)?The view only seems to be responding to mouse clicks by default.I should perhaps connect the
"key_press_event"
signal to the view and in the handler, check
gtk_tree_view_row_expanded ()
and call
gtk_tree_view_expand_row ()
(with corresponding actions for collapse).
The row-activated signal was the better (right) callback choice instead of the key_press_event. Gave me all the parameters need to use gtk_tree_view_expand_row() and gtk_tree_view_collapse_row(). Works as expected.
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.