MATLAB Answers

lock first app if second is running

21 views (last 30 days)
Tomas Girasek
Tomas Girasek on 26 Apr 2019
Edited: Jan on 15 Aug 2019
how can i lock first app if secod is running.
I have the main app and one app which ask some input data from oprator. And i would like to lock main app during time when operator write some data to second one app. It should be locked, visibility is not solutions....


Jan on 26 Apr 2019
What exactly is an "app" and what do you call "locking"? What is the "operator"?
Jan on 29 Apr 2019
[MOVED from section for answers] Tomas Girasek wrote:
The app is aplication created in appdesigner. By first aplication (main app) is opened second one aplication where "operator" (somebody wo will works wit this aplication) will write some neccesary data. During this time i would like to lock the main app. Lock - in my case meaning disable whole main aplication until second one is running.
Oliver Schön
Oliver Schön on 14 Aug 2019
same problem here but found an alternative solution:
  • add an image component to overlay the complete main app window, e.g. app.BlankWindow, set ScaleMethod to 'strech'
  • set its properties Visible and Enable to 'off' on creation
  • in the main app StartupFcn initialise app.BlankWindow.ImageSource = ones(1,1,3)*0.5 (i.e. single pixel grey image)
  • when starting a dialog box set the image Visible and Enable to 'on', now no clicks go through to the main app (unless you add an ImageClickedFcn callback)
  • when the dialog exits set the image properties back to 'off'
This mimics the uiconfirm dialog function except that it does not restrict the dialog window to the frame of the main app.

Sign in to comment.

Accepted Answer

Jan on 29 Apr 2019
Edited: Jan on 15 Aug 2019
You can use waitfor in the main function and provide the handle of the uifigure.
[EDITED] I assume, that works with figures only, not with uifigures. I did not test with uifigures also, and it would run under Windows only:
% [EDITED: works with uifigure also, tested in R2018b]
H = uifigure;
WindowAPI(H, 'enable', 0);
WindowAPI(H, 'enable', 1);
You can disable all elements of the uifigure manually: Store a collection of all handles you want to disable in aa variable. Then set the 'Enable' property to 'off' and add a message, that the window is locked until the other is finished.
Actually using uiwait should work suffciently, if the other window is 'modal'. Unfortunately I do not see a way to create a modal uifigure. But if the 2nd GUI is opened through a callback of the 1st GUI, setting teh 'Interruptible' property of the 1st GUI to 'off' and the 'BusyAction' to 'cancel' should ignore all interactions with the 1st GUI, when it waits to waitfor inside the callback.
Another idea is to set a flag in the GUI's UserData, which is checked in each callback, as long as the 2nd GUI is open:
function CallbackOf1StGUI(H, EventData)
GUI1 = ancestor(H, 'uifigure'); % Does this work?
if GUI1.UserData.Locked
GUI2 = OpenGUI2();
GUI1.UserData.Locked = true;
GUI1.UserData.Locked = false;
Add the test of the locked GUI in each callback.


Sign in to comment.

More Answers (0)

Sign in to answer this question.