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author | k-m_schindler <k-m_schindler@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2008-08-27 15:00:10 +0000 |
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committer | k-m_schindler <k-m_schindler@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2008-08-27 15:00:10 +0000 |
commit | 9506a3ab6ae1b5c51eec2ccb8773eb4219766e7d (patch) | |
tree | b65ae0f889de664651dddabee852908f191eac07 /src/classes0/UHooks.pas | |
parent | 16a6e6801fde495b2782e2e04a0cf055ce1e1516 (diff) | |
download | usdx-9506a3ab6ae1b5c51eec2ccb8773eb4219766e7d.tar.gz usdx-9506a3ab6ae1b5c51eec2ccb8773eb4219766e7d.tar.xz usdx-9506a3ab6ae1b5c51eec2ccb8773eb4219766e7d.zip |
rename Classes part2
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@1308 b956fd51-792f-4845-bead-9b4dfca2ff2c
Diffstat (limited to 'src/classes0/UHooks.pas')
-rw-r--r-- | src/classes0/UHooks.pas | 434 |
1 files changed, 0 insertions, 434 deletions
diff --git a/src/classes0/UHooks.pas b/src/classes0/UHooks.pas deleted file mode 100644 index f0ba3276..00000000 --- a/src/classes0/UHooks.pas +++ /dev/null @@ -1,434 +0,0 @@ -unit UHooks; - -{********************* - THookManager - Class for saving, managing and calling of Hooks. - Saves all hookable events and their subscribers -*********************} -interface - -{$IFDEF FPC} - {$MODE Delphi} -{$ENDIF} - -{$I switches.inc} - -uses uPluginDefs, - SysUtils; - -type - //Record that saves info from Subscriber - PSubscriberInfo = ^TSubscriberInfo; - TSubscriberInfo = record - Self: THandle; //ID of this Subscription (First Word: ID of Subscription; 2nd Word: ID of Hook) - Next: PSubscriberInfo; //Pointer to next Item in HookChain - - Owner: Integer; //For Error Handling and Plugin Unloading. - - //Here is s/t tricky - //To avoid writing of Wrapping Functions to Hook an Event with a Class - //We save a Normal Proc or a Method of a Class - Case isClass: boolean of - False: (Proc: TUS_Hook); //Proc that will be called on Event - True: (ProcOfClass: TUS_Hook_of_Object); - end; - - TEventInfo = record - Name: String[60]; //Name of Event - FirstSubscriber: PSubscriberInfo; //First subscriber in chain - LastSubscriber: PSubscriberInfo; //Last " (for easier subscriber adding - end; - - THookManager = class - private - Events: array of TEventInfo; - SpaceinEvents: Word; //Number of empty Items in Events Array. (e.g. Deleted Items) - - Procedure FreeSubscriber(const EventIndex: Word; const Last, Cur: PSubscriberInfo); - public - constructor Create(const SpacetoAllocate: Word); - - Function AddEvent (const EventName: PChar): THandle; - Function DelEvent (hEvent: THandle): Integer; - - Function AddSubscriber (const EventName: PChar; const Proc: TUS_Hook = nil; const ProcOfClass: TUS_Hook_of_Object = nil): THandle; - Function DelSubscriber (const hSubscriber: THandle): Integer; - - Function CallEventChain (const hEvent: THandle; const wParam: TwParam; lParam: TlParam): Integer; - Function EventExists (const EventName: PChar): Integer; - - Procedure DelbyOwner(const Owner: Integer); - end; - -function HookTest(wParam: TwParam; lParam: TlParam): integer; stdcall; - -var - HookManager: THookManager; - -implementation -uses - ULog, - UCore; - -//------------ -// Create - Creates Class and Set Standard Values -//------------ -constructor THookManager.Create(const SpacetoAllocate: Word); -var I: Integer; -begin - inherited Create(); - - //Get the Space and "Zero" it - SetLength (Events, SpacetoAllocate); - For I := 0 to SpacetoAllocate-1 do - Events[I].Name[1] := chr(0); - - SpaceinEvents := SpacetoAllocate; - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Succesful Created.'); - {$ENDIF} -end; - -//------------ -// AddEvent - Adds an Event and return the Events Handle or 0 on Failure -//------------ -Function THookManager.AddEvent (const EventName: PChar): THandle; -var I: Integer; -begin - Result := 0; - - if (EventExists(EventName) = 0) then - begin - If (SpaceinEvents > 0) then - begin - //There is already Space available - //Go Search it! - For I := 0 to High(Events) do - If (Events[I].Name[1] = chr(0)) then - begin //Found Space - Result := I; - Dec(SpaceinEvents); - Break; - end; - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Found Space for Event at Handle: ''' + InttoStr(Result+1) + ''); - {$ENDIF} - end - else - begin //There is no Space => Go make some! - Result := Length(Events); - SetLength(Events, Result + 1); - end; - - //Set Events Data - Events[Result].Name := EventName; - Events[Result].FirstSubscriber := nil; - Events[Result].LastSubscriber := nil; - - //Handle is Index + 1 - Inc(Result); - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Add Event succesful: ''' + EventName + ''); - {$ENDIF} - end - {$IFDEF DEBUG} - else - debugWriteLn('HookManager: Trying to ReAdd Event: ''' + EventName + ''); - {$ENDIF} -end; - -//------------ -// DelEvent - Deletes an Event by Handle Returns False on Failure -//------------ -Function THookManager.DelEvent (hEvent: THandle): Integer; -var - Cur, Last: PSubscriberInfo; -begin - hEvent := hEvent - 1; //Arrayindex is Handle - 1 - Result := -1; - - - If (Length(Events) > hEvent) AND (Events[hEvent].Name[1] <> chr(0)) then - begin //Event exists - //Free the Space for all Subscribers - Cur := Events[hEvent].FirstSubscriber; - - While (Cur <> nil) do - begin - Last := Cur; - Cur := Cur.Next; - FreeMem(Last, SizeOf(TSubscriberInfo)); - end; - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Removed Event succesful: ''' + Events[hEvent].Name + ''); - {$ENDIF} - - //Free the Event - Events[hEvent].Name[1] := chr(0); - Inc(SpaceinEvents); //There is one more space for new events - end - - {$IFDEF DEBUG} - else - debugWriteLn('HookManager: Try to Remove not Existing Event. Handle: ''' + InttoStr(hEvent) + ''); - {$ENDIF} -end; - -//------------ -// AddSubscriber - Adds an Subscriber to the Event by Name -// Returns Handle of the Subscribtion or 0 on Failure -//------------ -Function THookManager.AddSubscriber (const EventName: PChar; const Proc: TUS_Hook; const ProcOfClass: TUS_Hook_of_Object): THandle; -var - EventHandle: THandle; - EventIndex: Cardinal; - Cur: PSubscriberInfo; -begin - Result := 0; - - If (@Proc <> nil) or (@ProcOfClass <> nil) then - begin - EventHandle := EventExists(EventName); - - If (EventHandle <> 0) then - begin - EventIndex := EventHandle - 1; - - //Get Memory - GetMem(Cur, SizeOf(TSubscriberInfo)); - - //Fill it with Data - Cur.Next := nil; - - //Add Owner - Cur.Owner := Core.CurExecuted; - - If (@Proc = nil) then - begin //Use the ProcofClass Method - Cur.isClass := True; - Cur.ProcOfClass := ProcofClass; - end - else //Use the normal Proc - begin - Cur.isClass := False; - Cur.Proc := Proc; - end; - - //Create Handle (1st Word: Handle of Event; 2nd Word: unique ID - If (Events[EventIndex].LastSubscriber = nil) then - begin - If (Events[EventIndex].FirstSubscriber = nil) then - begin - Result := (EventHandle SHL 16); - Events[EventIndex].FirstSubscriber := Cur; - end - Else - begin - Result := Events[EventIndex].FirstSubscriber.Self + 1; - end; - end - Else - begin - Result := Events[EventIndex].LastSubscriber.Self + 1; - Events[EventIndex].LastSubscriber.Next := Cur; - end; - - Cur.Self := Result; - - //Add to Chain - Events[EventIndex].LastSubscriber := Cur; - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Add Subscriber to Event ''' + Events[EventIndex].Name + ''' succesful. Handle: ''' + InttoStr(Result) + ''' Owner: ' + InttoStr(Cur.Owner)); - {$ENDIF} - end; - end; -end; - -//------------ -// FreeSubscriber - Helper for DelSubscriber. Prevents Loss of Chain Items. Frees Memory. -//------------ -Procedure THookManager.FreeSubscriber(const EventIndex: Word; const Last, Cur: PSubscriberInfo); -begin - //Delete from Chain - If (Last <> nil) then - begin - Last.Next := Cur.Next; - end - else //Was first Popup - begin - Events[EventIndex].FirstSubscriber := Cur.Next; - end; - - //Was this Last subscription ? - If (Cur = Events[EventIndex].LastSubscriber) then - begin //Change Last Subscriber - Events[EventIndex].LastSubscriber := Last; - end; - - //Free Space: - FreeMem(Cur, SizeOf(TSubscriberInfo)); -end; - -//------------ -// DelSubscriber - Deletes a Subscribtion by Handle, return non Zero on Failure -//------------ -Function THookManager.DelSubscriber (const hSubscriber: THandle): Integer; -var - EventIndex: Cardinal; - Cur, Last: PSubscriberInfo; -begin - Result := -1; - EventIndex := ((hSubscriber AND (High(THandle) xor High(Word))) SHR 16) - 1; - - //Existing Event ? - If (EventIndex < Length(Events)) AND (Events[EventIndex].Name[1] <> chr(0)) then - begin - Result := -2; //Return -1 on not existing Event, -2 on not existing Subscription - - //Search for Subscription - Cur := Events[EventIndex].FirstSubscriber; - Last := nil; - - //go through the chain ... - While (Cur <> nil) do - begin - If (Cur.Self = hSubscriber) then - begin //Found Subscription we searched for - FreeSubscriber(EventIndex, Last, Cur); - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Del Subscriber from Event ''' + Events[EventIndex].Name + ''' succesful. Handle: ''' + InttoStr(hSubscriber) + ''); - {$ENDIF} - - //Set Result and Break the Loop - Result := 0; - Break; - end; - - Last := Cur; - Cur := Cur.Next; - end; - - end; -end; - - -//------------ -// CallEventChain - Calls the Chain of a specified EventHandle -// Returns: -1: Handle doesn't Exist, 0 Chain is called until the End -//------------ -Function THookManager.CallEventChain (const hEvent: THandle; const wParam: TwParam; lParam: TlParam): Integer; -var - EventIndex: Cardinal; - Cur: PSubscriberInfo; - CurExecutedBackup: Integer; //backup of Core.CurExecuted Attribute -begin - Result := -1; - EventIndex := hEvent - 1; - - If ((EventIndex <= High(Events)) AND (Events[EventIndex].Name[1] <> chr(0))) then - begin //Existing Event - //Backup CurExecuted - CurExecutedBackup := Core.CurExecuted; - - //Start calling the Chain !!!11 - Cur := Events[EventIndex].FirstSubscriber; - Result := 0; - //Call Hooks until the Chain is at the End or breaked - While ((Cur <> nil) AND (Result = 0)) do - begin - //Set CurExecuted - Core.CurExecuted := Cur.Owner; - if (Cur.isClass) then - Result := Cur.ProcOfClass(wParam, lParam) - else - Result := Cur.Proc(wParam, lParam); - - Cur := Cur.Next; - end; - - //Restore CurExecuted - Core.CurExecuted := CurExecutedBackup; - end; - - {$IFDEF DEBUG} - debugWriteLn('HookManager: Called Chain from Event ''' + Events[EventIndex].Name + ''' succesful. Result: ''' + InttoStr(Result) + ''); - {$ENDIF} -end; - -//------------ -// EventExists - Returns non Zero if an Event with the given Name exists -//------------ -Function THookManager.EventExists (const EventName: PChar): Integer; -var - I: Integer; - Name: String[60]; -begin - Result := 0; - //If (Length(EventName) < - Name := String(EventName); - - //Sure not to search for empty space - If (Name[1] <> chr(0)) then - begin - //Search for Event - For I := 0 to High(Events) do - If (Events[I].Name = Name) then - begin //Event found - Result := I + 1; - Break; - end; - end; -end; - -//------------ -// DelbyOwner - Dels all Subscriptions by a specific Owner. (For Clean Plugin/Module unloading) -//------------ -Procedure THookManager.DelbyOwner(const Owner: Integer); -var - I: Integer; - Cur, Last: PSubscriberInfo; -begin - //Search for Owner in all Hooks Chains - For I := 0 to High(Events) do - begin - If (Events[I].Name[1] <> chr(0)) then - begin - - Last := nil; - Cur := Events[I].FirstSubscriber; - //Went Through Chain - While (Cur <> nil) do - begin - If (Cur.Owner = Owner) then - begin //Found Subscription by Owner -> Delete - FreeSubscriber(I, Last, Cur); - If (Last <> nil) then - Cur := Last.Next - else - Cur := Events[I].FirstSubscriber; - end - Else - begin - //Next Item: - Last := Cur; - Cur := Cur.Next; - end; - end; - end; - end; -end; - - -function HookTest(wParam: TwParam; lParam: TlParam): integer; stdcall; -begin - Result := 0; //Don't break the chain - Core.ShowMessage(CORE_SM_INFO, PChar(String(PChar(Pointer(lParam))) + ': ' + String(PChar(Pointer(wParam))))); -end; - -end. |