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Took me a bit to figure this one out, so I'm sharing it here for my own reference and maybe it is useful to others.
Of course most will know the plist trick which hides the icon by default (works with code below!):
<key>LSUIElement</key> <string>1</string>
But this is something we cannot change programatically.
This function toggles the Dock icon of an application VISIBLE or HIDDEN.
Note:
- When you set hiding the dock icon, the application form will hide as well (as with form1.hide), you can make it visible again with form1.show and the icon remains hidden.
- It appears that you can instead of "NSApplicationActivationPolicyAccessory" use "NSApplicationActivationPolicyProhibited" with the same effect.
{$mode objfpc}{$H+}
{$modeswitch objectivec1}
uses
... CocoaAll ...;
procedure t4a_ToggleDockIcon(ShowIcon:boolean);
begin
if ShowIcon then
NSApplication.sharedApplication.setActivationPolicy(NSApplicationActivationPolicyRegular)
else
NSApplication.sharedApplication.setActivationPolicy(NSApplicationActivationPolicyAccessory);
end;
