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156 lines
4.2 KiB
C++
156 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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// Written by John R. McMullen
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#include "CButtonEnabler.h"
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#include "LSharable.h"
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#include "MButtonEnablerPolicy.h"
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//======================================
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#pragma mark --------- class CButtonMaster
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//======================================
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//======================================
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class CButtonMaster
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//======================================
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: public LAttachable // CButtonEnablers all attach to this
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, public LSharable // shared by all CButtonEnablers.
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{
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public:
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CButtonMaster();
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virtual ~CButtonMaster();
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static CButtonMaster* sButtonMaster;
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}; // class CButtonMaster
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CButtonMaster* CButtonMaster::sButtonMaster = nil;
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//-----------------------------------
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CButtonMaster::CButtonMaster()
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//-----------------------------------
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{
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sButtonMaster = this;
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} // CButtonMaster::CButtonMaster()
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//-----------------------------------
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CButtonMaster::~CButtonMaster()
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//-----------------------------------
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{
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sButtonMaster = nil;
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} // CButtonMaster::~CButtonMaster()
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//======================================
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#pragma mark --------- class CButtonEnabler
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//======================================
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//-----------------------------------
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CButtonEnabler* CButtonEnabler::CreateButtonEnablerStream(LStream* inStream)
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//-----------------------------------
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{
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return new CButtonEnabler(inStream);
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}
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//-----------------------------------
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CButtonEnabler::CButtonEnabler(LStream* inStream)
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//-----------------------------------
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: LAttachment(inStream)
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, mControl(nil)
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{
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SetMessage(msg_Event); // execute me only for event messages.
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LAttachable *host = LAttachable::GetDefaultAttachable();
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mControl = dynamic_cast<LControl*>(host);
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Assert_(mControl);
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Try_
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{
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if (!CButtonMaster::sButtonMaster)
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new CButtonMaster;
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CButtonMaster::sButtonMaster->AddUser(this);
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CButtonMaster::sButtonMaster->AddAttachment(this, nil, false);
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// don't care where, master is not owner.
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}
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Catch_ (inErr)
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{
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}
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EndCatch_
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LAttachable::SetDefaultAttachable(host);
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// Restore, because LAttachable's constructor (called when we made
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// the new button master) clobbers the default attachable
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} // CButtonEnabler::CButtonEnabler
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//-----------------------------------
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CButtonEnabler::~CButtonEnabler()
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//-----------------------------------
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{
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if (CButtonMaster::sButtonMaster)
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{
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CButtonMaster::sButtonMaster->RemoveAttachment(this);
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CButtonMaster::sButtonMaster->RemoveUser(this);
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}
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} // CButtonEnabler::~CButtonEnabler
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//-----------------------------------
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void CButtonEnabler::UpdateButtons()
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//-----------------------------------
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{
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if (CButtonMaster::sButtonMaster)
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CButtonMaster::sButtonMaster->ExecuteAttachments(msg_Event, nil);
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} // CButtonEnabler::UpdateButtons
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//-----------------------------------
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void CButtonEnabler::ExecuteSelf(MessageT inMessage, void*)
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//-----------------------------------
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{
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MButtonEnablerPolicy* thePolicy = dynamic_cast<MButtonEnablerPolicy*>(mControl);
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if (thePolicy)
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{
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// Delegate the policy
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thePolicy->HandleButtonEnabling();
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}
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else
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{
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// Default enabling policy for LControl
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LCommander* theTarget = LCommander::GetTarget();
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MessageT command = mControl->GetValueMessage();
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Boolean enabled = false;
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Boolean usesMark = false;
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Str255 outName;
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Char16 outMark;
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if (!mControl->IsActive() || !mControl->IsVisible())
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return;
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if (!theTarget)
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return;
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theTarget->ProcessCommandStatus(command, enabled, usesMark, outMark, outName);
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if (enabled)
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{
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mControl->Enable();
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}
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else
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{
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mControl->Disable();
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}
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}
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} // CButtonEnabler::ExecuteSelf
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