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PageHistory
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2003-02-14
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//--------------------------------------------------------------------------
//
// Copyright (c) 2002, Colin Granville
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the following
// conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials
// provided with the distribution.
//
// * The name Colin Granville may not be used to endorse or promote
// products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
//
//--------------------------------------------------------------------------
#include "PageHistory.h"
#include "DocView.h"
#include "Document.h"
#include "PageHistory.h"
#include "UserEvents.h"
PageHistory::PageHistory(DocView& v,DocViewToolbar& tb,GuiWindow& ancestor)
: view(v),
backIcon(tb,0x85),
forwardIcon(tb,0x86),
adjusterClickedTarget(&ancestor,GuiAdjuster::Clicked::Event,this,PageHistory::adjusterClicked),
historyBackTarget(&ancestor,User_HistoryBack,this,PageHistory::historyBack),
historyForwardTarget(&ancestor,User_HistoryForward,this,PageHistory::historyForward)
{
begin=0;
end=0;
current=-1;
pendingPage=0;
}
//****************************************************************
PageHistory::~PageHistory() {}
//****************************************************************
void PageHistory::add(int num)
{
addPending();
current++;
if (current==PAGE_HISTORY_SIZE) current=0;
buf[current].page=num;
buf[current].docName=view.getDocument().getFileName();
end=current+1;
if (end==PAGE_HISTORY_SIZE) end=0;
if (end==begin)
{
begin=end+1;
if (begin==PAGE_HISTORY_SIZE) begin=0;
}
setFade();
}
//****************************************************************
const DocPage* PageHistory::back()
{
addPending();
if (current<0 || current==begin) return 0;
current--;
if (current<0) current+=PAGE_HISTORY_SIZE;
setFade();
return &buf[current];
}
//****************************************************************
const DocPage* PageHistory::forward()
{
addPending();
if (current<0) return 0;
int next=current+1;
if (next==PAGE_HISTORY_SIZE) next=0;
if (next==end) return 0;
current=next;
setFade();
return &buf[current];
}
//****************************************************************
void PageHistory::addPending(int num)
{
pendingPage=num;
forwardIcon.setFlags(GuiToolboxGadget_Faded);
backIcon.setFlags(0);
}
//****************************************************************
void PageHistory::addPending()
{
if (pendingPage==0) return;
int page=pendingPage;
pendingPage=0;
add(page);
}
//*************************************************************************
void PageHistory::setFade()
{
backIcon.setFlags((current<0 || current==begin) ? GuiToolboxGadget_Faded : 0);
int next=current+1;
if (next==PAGE_HISTORY_SIZE) next=0;
forwardIcon.setFlags((current<0 || next==end) ? GuiToolboxGadget_Faded : 0);
}
//*************************************************************************
void PageHistory::setPage(const DocPage* page)
{
if (!page) return;
view.setPage(*page,0);
}
//*************************************************************************
Claim PageHistory::historyBack(GuiToolboxEvent&,const GuiIdBlock&)
{
setPage(back());
return CLAIM;
}
//*************************************************************************
Claim PageHistory::historyForward(GuiToolboxEvent&,const GuiIdBlock&)
{
setPage(forward());
return CLAIM;
}
//*************************************************************************
Claim PageHistory::adjusterClicked(GuiToolboxEvent& ev,const GuiIdBlock& idBlock)
{
if (! (idBlock.self.component == backIcon.componentId() ||
idBlock.self.component == forwardIcon.componentId()) )return DONT_CLAIM;
GuiAdjuster::Clicked& click = (GuiAdjuster::Clicked&)ev;
if (click.isDown())
historyForward(ev,idBlock);
else
historyBack(ev,idBlock);
return CLAIM;
};