Updating mainmenu items before show
lazarus / 21-General

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torbente · 2021-01-23 01:47

I am implementing a main menu, but there are some items that must
change it caption according to the value of some variables.
For example:
An item have "Start counting"
But if the app is already counting, the item must say "Stop Counting"
Is there any way to verify a variable when the  mainmenu is clicked,
BEFORE it shows the items? IF so, i could so something like this:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i counting :
boolean;If counting then MainMenu.Items[0].Caption :='Stop
counting'else MainMenu.Items[0].Caption :='Start counting';

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lucamar · 2021-01-23 03:47

Quote from: torbente on January 23, 2021, 02:47:59 amIs there any way
to verify a variable when the  mainmenu is clicked, BEFORE it shows
the items?Yes, attach a handler to the OnClick event of the (main)menu
item.

It's often used for e.g. an "Edit" item where you want to (de)activate
Cut/Copy/Paste/etc. depending on whether some control has a selection
or the state of the clipboard.

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torbente · 2021-01-23 06:02

But in that case the menu item was already show.

I understood now!

Quote from: lucamar on January 23, 2021, 04:47:38 amQuote from:
torbente on January 23, 2021, 02:47:59 amIs there any way to verify a
variable when the  mainmenu is clicked, BEFORE it shows the items?Yes,
attach a handler to the OnClick event of the (main)menu item.

It's often used for e.g. an "Edit" item where you want to (de)activate
Cut/Copy/Paste/etc. depending on whether some control has a selection
or the state of the clipboard.