WoW:API Frame HookScript: Difference between revisions

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m (New page: {{widgetmethod}} Post hooks a script handler (secure). frame:HookScript("handler", function) == Parameters == === Arguments === <!-- List each argument, together with its type --> :("h...)
 
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{{widgetmethod}}
{{widgetmethod}}
 
Sets a function to be called automatically after the original function is called, or "post hook". Works with secure frames. (secure)
Post hooks a script handler (secure).
  frame:HookScript("handler", func)
 
  frame:HookScript("handler", function)


== Parameters ==
== Parameters ==
=== Arguments ===
=== Arguments ===
<!-- List each argument, together with its type -->
:;handler : string - the name of the handler type, like 'OnShow', 'OnClick'.  See [[Widget handlers]].
:("handler", func)
:;func : function - function to be called. Cannot be 'nil'.


:;handler : String - The handler to attach func to (OnShow, OnEvent, [[Widget_handlers|et al]])
== Summary ==
:;func : Function - The function to call. Unlike [[API_Frame_SetScript|:SetScript()]], <tt>nil</tt> throws an error. <tt>func</tt> is called with arguments <tt>(frame, arg1, arg2, ...)</tt> (<tt>event</tt> being <tt>arg1</tt> for OnEvent handlers)
'HookScript' can be used on secure frames, where 'SetScript' would cause "taint" issues and bad UI behavior. Calls each hooked function after calling its original handler function. Any parameters returned by the hooking function will not be discarded, and not be passed to the original handler. Any handler added this way cannot be removed, and will stay until the UI is reloaded.


== Example ==
== Examples ==
local MyPartyFrame_OnClick = function( self, button )
    print(self:GetName() .. " clicked with " .. button)
end
  for i = 1, 4 do
  for i = 1, 4 do
     local frame = _G["PartyMemberFrame"..i]
     local frame = _G["PartyMemberFrame"..i]
     frame:HookScript("OnClick", function(self, button)
     frame:HookScript("OnClick", MyPartyFrame_OnClick)
        print(self:GetName() .. " clicked with " .. button)
    end)
  end
  end
 
Print notification in chat log when the player clicks a party member's portrait. 'HookScript' works while preserving the security of the unit frame after calling its original handler, where 'SetScript' in this case would not.
====Result====
Alert the player when he clicks a party member's portrait while preserving the security of the unit frame after calling its original handler.


== Notes ==
== Notes ==
* Just like [[API_hooksecurefunc|hooksecurefunc]], this can be used on secure code.
* Like any event handler, 'func' is called with arguments '(frame, arg1, arg2, ...)', 'event' being 'arg1' for OnEvent handlers.
* If the frame doesn't have a ''func'' for ''handler'', one will be created as if you called [[API_Frame_SetScript|:SetScript("handler", func)]].
* Just like {{api|hooksecurefunc}}("handler", func), this can be used on secure code.
* Every script handler has at least one argument (the frame itself, usually ''self''). See [[widget handlers]] for details on each handler.
* If the frame doesn't have a 'func' for 'handler', one will be created as if you called {{api|Frame:SetScript|t=w}}().
* Every script handler has at least one argument (the frame itself, usually ''self'').
* See [[widget handlers]] for details on each handler.


__NOTOC__
== See also ==
* {{api|hooksecurefunc}}
* {{api|Frame:SetScript|t=w}}
* {{api|Frame:GetScript|t=w}}
* [[Widget handlers]]

Revision as of 20:09, 16 February 2015

← Widget API ← Frame < HookScript

Sets a function to be called automatically after the original function is called, or "post hook". Works with secure frames. (secure) 

frame:HookScript("handler", func)

Parameters

Arguments

handler
string - the name of the handler type, like 'OnShow', 'OnClick'. See Widget handlers.
func
function - function to be called. Cannot be 'nil'.

Summary

'HookScript' can be used on secure frames, where 'SetScript' would cause "taint" issues and bad UI behavior. Calls each hooked function after calling its original handler function. Any parameters returned by the hooking function will not be discarded, and not be passed to the original handler. Any handler added this way cannot be removed, and will stay until the UI is reloaded.

Examples

local MyPartyFrame_OnClick = function( self, button )
    print(self:GetName() .. " clicked with " .. button)
end
for i = 1, 4 do
    local frame = _G["PartyMemberFrame"..i]
    frame:HookScript("OnClick", MyPartyFrame_OnClick)
end

Print notification in chat log when the player clicks a party member's portrait. 'HookScript' works while preserving the security of the unit frame after calling its original handler, where 'SetScript' in this case would not.

Notes

  • Like any event handler, 'func' is called with arguments '(frame, arg1, arg2, ...)', 'event' being 'arg1' for OnEvent handlers.
  • Just like hooksecurefunc("handler", func), this can be used on secure code.
  • If the frame doesn't have a 'func' for 'handler', one will be created as if you called Frame:SetScript().
  • Every script handler has at least one argument (the frame itself, usually self).
  • See widget handlers for details on each handler.

See also

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