I am developing cocoa application having multiple windows. There is a red close button on left corner of window. And I want to handle click event of close button so that I can show message to ask user whether he wants to close window or not. If user accept to close window then application will be terminated otherwise same window shown to user.
Any idea how can I handle click event of close button???
Please look at NSWindowDelegate protocol reference, the method which you are looking for is-
- (BOOL)windowShouldClose:(id)sender
NSWindowController has a method
- (BOOL)shouldCloseDocument
Related
so i have a simple NSMenu. It is attached to a Status Item Button.
When i click the Button it pops Open.
Now my Problem is that as soon as i click outside of the NSMenu, it closes. How can i avoid that ?
I did try many things but cant get that to work.
The reason i need that is that when the user clicks something in the NSMenu, another window opens, and while this window is open i also want the NSMenu to stay open. But it just does not work.
I feel like its impossible.
Many Thanks in advance.
I believe you have to create a custom view that pops up but something that could be done natively with just NSMenu.
I'm trying to determine when an NSOpenPanel is closing before it actually closes. I need to do this so I can overlay another window with a screenshot of the open panel on top of it to be animated. Unfortunately, all the notifications that you seem to be able to access seem to fire AFTER the window's already been closed. This leads to a jarring stutter before you start your transition.
I've tried:
- using NSWindow delegate methods on the open panel (apparently, none of the NSWindow delegate methods work)
- monitoring panel:userEnteredFilename:confirmed: (not called)
- showing the dialog with a callback (callback happens AFTER the panel disappears)
You should register your controller as the open panel's delegate and then implement the -panel:isValidFilename: delegate method. This method will be called just before the open dialog closes.
You should return YES from the method if you just want the notification. Returning NO allows you to prevent the open dialog from being closed.
Another way to handle this was to look through NSOpenPanel's subviews for the Cancel button and swap yourself in as the target/action. This is what i ended up doing.
I have a program with many windows open. I want all windows to be visible, but only one window can be interactable, until a certain event has occured. e.g. pressing a button.
At the moment, I can still click another window, and interact with it, how do I only allow interaction with ONE window, until a certain event occurs?
Imagine this as the program:
I want only the frontmost Window to be selectable, if I try to select any of the other windows behind it, it should not work.
Does anoybody know how to do this?
Thanks!
Michael
It sounds like you want a modal window.
In one of my first Cocoa applications I have just a single window with 2 NSTextField instances - for user text input and of output of text processing.
If my user clicks on the red x on the top left, the window closes but the application is still running and icon stays in the dock - the normal Mac behavior.
When the user double-clicks on the icon in dock or on the desktop, this does not reopen the window - apparently also normal Mac behavior, but confusing to the user.
To get the app back into a running state, the user has to force Quit from the main menu or the context menu, and restart the app by clicking on one of the icons.
I searched Apple doc and forums, and it seemed that the following should prevent the closing of the window (my first preference : hide the widow so it can be reopened later) :
add a delegate to NSApp
delegate implements -applicationShouldHandleReopen which calls [mainWindow makeKeyAndOrderFront:self]; and returns TRUE
delegate implements -windowShouldClose which returns FALSE
However, although -windowShouldClose is called, the window closes.
What am I missing here?
As an alternative (my second preference), I added to the delegate
-applicationShouldTerminateAfterLastWindowClosed which returns YES
This works, i.e. the application closes when the used clicks on the red x,
and the user can restart the app later without further ado.
Clarifications and pointers to specific doc and working code examples would be appreciated.
Rudi
"When the user double-clicks on the icon in dock or on the desktop, this does not reopen the window - apparently also normal Mac behavior, but confusing to the user."
If you want the window to re-open in that case, implement applicationShouldHandleReopen:hasVisibleWindows:. There's nothing un-Mac-like about opening a window when the user clicks the dock icon after closing all the windows; lots of apps do it and the delegate exists specifically to support that behavior.
First of all, your "alternative" behavior of terminating the app on window close is probably the preferred approach for your situation. Users may be confused when they can't close the window.
If you really want to prevent the window from being closed, why not just disable the close control on the window in IB?
I have a small OSX Cocoa app that just bring up an IKPicutreTaker and saves the picture to a file if one is set. I use applicationShouldTerminateAfterLastWindowClosed: to close the application when the pictureTaker is closed. This all works fine when I either set(this is done when you have picked the picture you want) or when you hit cancel, but when I click on the red arrow in the top left of the windows, the application does not quit when the window is closed this way. Is this intended functionality or am I doing something wrong (not setting some flag?). Also, is there some way to disable this button?
Clicking the red button does not close an application, partly because that verb does not go with that noun. The red button closes the window it's on; it does not quit your application. (An application can and will often have multiple windows on Mac OS X.)
That's where applicationShouldTerminateAfterLastWindowClosed: comes in. Whenever the user closes the last window on the screen (whether by clicking the red button, by choosing Close from the File menu, or by some other means), the NSApplication object will send an applicationShouldTerminateAfterLastWindowClosed: message to its delegate, to ask it whether the application should terminate. If the delegate responds to the message by returning YES, then the application will terminate itself.
You don't say exactly how you're “using” applicationShouldTerminateAfterLastWindowClosed:. If you're just sending it to some object, that's not going to work, because you're asking a question (“should the application terminate after the last window is closed?”) and then ignoring the answer. If you implement the method in an object, but that object isn't the application's delegate, that won't work either—the application object only sends that message to its delegate.
You need to implement the method in your delegate, and return YES when it is appropriate for the application to terminate when the user closes its last window.