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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <navmgr.hxx>
#include <wrtsh.hxx>
#include <sfx2/bindings.hxx>
#include <sfx2/viewfrm.hxx>
#include <vcl/svapp.hxx>
#include <cmdid.h>
#include <view.hxx>
#include <doc.hxx>
#include <unocrsr.hxx>
// This method positions the cursor to the position rPos.
void SwNavigationMgr::GotoSwPosition(const SwPosition &rPos) {
// EnterStdMode() prevents the cursor to 'block' the current
// shell when it should move from the image back to the normal shell
m_rMyShell.EnterStdMode();
m_rMyShell.StartAllAction();
// cursor consists of two SwPositions: Point and Mark.
// Such a pair is called a PaM. SwPaM is derived from SwRing.
// The Ring contains the single regions of a multi-selection.
SwPaM* pPaM = m_rMyShell.GetCursor();
if(pPaM->HasMark())
pPaM->DeleteMark(); // If there was a selection, get rid of it
*pPaM->GetPoint() = rPos; // Position Cursor
m_rMyShell.EndAllAction();
}
// Ctor for the SwNavigationMgr class
// Sets the shell to the current shell
// and the index of the current position to 0
SwNavigationMgr::SwNavigationMgr(SwWrtShell & rShell)
: m_nCurrent(0), m_rMyShell(rShell)
{
}
SwNavigationMgr::~SwNavigationMgr()
{
SolarMutexGuard g;
for (auto & it : m_entries)
{
EndListening(it->m_aNotifier);
}
m_entries.clear();
}
void SwNavigationMgr::Notify(SfxBroadcaster& rBC, const SfxHint& rHint)
{
// our cursors may now spontaneously self-destruct: remove from
// m_entries if that happens
if (typeid(rHint) == typeid(sw::UnoCursorHint))
{
auto it = std::find_if(m_entries.begin(), m_entries.end(),
[&rBC](const sw::UnoCursorPointer& rItem) { return !rItem || &rBC == &rItem->m_aNotifier; });
if (it != m_entries.end())
{
EndListening(rBC);
m_entries.erase(it);
}
}
}
// This method is used by the navigation shell - defined in sw/source/uibase/inc/navsh.hxx
// and implemented in sw/source/uibase/shells/navsh.cxx
// It is called when we want to check if the back button should be enabled or not.
// The back button should be enabled only if there are some entries in the navigation history
bool SwNavigationMgr::backEnabled() {
return (m_nCurrent > 0);
}
// Similar to backEnabled() method.
// The forward button should be enabled if we ever clicked back
// Due to the implementation of the navigation class, this is when the
// current position within the navigation history entries in not the last one
// i.e. when the m_nCurrent index is not at the end of the m_entries vector
bool SwNavigationMgr::forwardEnabled() {
return m_nCurrent+1 < m_entries.size();
}
// The goBack() method positions the cursor to the previous entry in the navigation history
// If there was no history to go forward to, it adds the current position of the cursor
// to the history so we could go forward to where we came from
void SwNavigationMgr::goBack() {
// Although the button should be disabled whenever the backEnabled() returns false,
// the UI is sometimes not as responsive as we would like it to be :)
// this check prevents segmentation faults and in this way the class is not relying on the UI
if (!backEnabled()) return;
/* Trying to get the current cursor */
SwPaM* pPaM = m_rMyShell.GetCursor();
if (!pPaM) {
return;
}
// This flag will be used to manually refresh the buttons
bool bForwardWasDisabled = !forwardEnabled();
// If we're going backwards in our history, but the current location is not
// in the history then we need to add *here* to it so that we can "go
// forward" to here again.
if (bForwardWasDisabled) {
// the cursor consists of two SwPositions: Point and Mark.
// We are adding the current Point to the navigation history
// so we could later navigate forward to it
// The addEntry() method returns true iff we should decrement
// the index before navigating back
if (addEntry(*pPaM->GetPoint()) ) {
m_nCurrent--;
}
}
m_nCurrent--;
// Position cursor to appropriate navigation history entry
GotoSwPosition(*m_entries[m_nCurrent]->GetPoint());
// Refresh the buttons
if (bForwardWasDisabled)
m_rMyShell.GetView().GetViewFrame().GetBindings().Invalidate(FN_NAVIGATION_FORWARD);
if (!backEnabled())
m_rMyShell.GetView().GetViewFrame().GetBindings().Invalidate(FN_NAVIGATION_BACK);
}
// The goForward() method positions the cursor to the next entry in the navigation history
void SwNavigationMgr::goForward() {
// Although the button should be disabled whenever the backForward() returns false,
// the UI is sometimes not as responsive as we would like it to be :)
// this check prevents segmentation faults and in this way the class is not relying on the UI
if (!forwardEnabled()) return;
// This flag will be used to manually refresh the buttons
bool bBackWasDisabled = !backEnabled();
// The current index is positioned at the current entry in the navigation history
// We have to increment it to go to the next entry
m_nCurrent++;
GotoSwPosition(*m_entries[m_nCurrent]->GetPoint());
// Refresh the buttons
if (bBackWasDisabled)
m_rMyShell.GetView().GetViewFrame().GetBindings().Invalidate(FN_NAVIGATION_BACK);
if (!forwardEnabled())
m_rMyShell.GetView().GetViewFrame().GetBindings().Invalidate(FN_NAVIGATION_FORWARD);
}
// This method adds the SwPosition rPos to the navigation history
// rPos is usually the current position of the cursor in the document
bool SwNavigationMgr::addEntry(const SwPosition& rPos) {
// Flags that will be used for refreshing the buttons
bool bBackWasDisabled = !backEnabled();
bool bForwardWasEnabled = forwardEnabled();
bool bRet = false; // return value of the function.
// Indicates whether the index should be decremented before
// jumping back or not
// The navigation history has recency with temporal ordering enhancement,
// as described on http://zing.ncsl.nist.gov/hfweb/proceedings/greenberg/
// If any forward history exists, twist the tail of the
// list from the current position to the end
if (bForwardWasEnabled) {
size_t number_ofm_entries = m_entries.size(); // To avoid calling m_entries.size() multiple times
int curr = m_nCurrent; // Index from which we'll twist the tail.
int n = (number_ofm_entries - curr) / 2; // Number of entries that will swap places
for (int i = 0; i < n; i++) {
std::swap(m_entries[curr + i], m_entries[number_ofm_entries -1 - i]);
}
if (*m_entries.back()->GetPoint() != rPos)
{
sw::UnoCursorPointer pCursor(m_rMyShell.GetDoc()->CreateUnoCursor(rPos));
StartListening(pCursor->m_aNotifier);
m_entries.push_back(pCursor);
}
bRet = true;
}
else {
if ( (!m_entries.empty() && *m_entries.back()->GetPoint() != rPos) || m_entries.empty() ) {
sw::UnoCursorPointer pCursor(m_rMyShell.GetDoc()->CreateUnoCursor(rPos));
StartListening(pCursor->m_aNotifier);
m_entries.push_back(pCursor);
bRet = true;
}
if (m_entries.size() > 1 && *m_entries.back()->GetPoint() == rPos)
bRet = true;
if (m_entries.size() == 1 && *m_entries.back()->GetPoint() == rPos)
bRet = false;
}
m_nCurrent = m_entries.size();
// Refresh buttons
if (bBackWasDisabled)
m_rMyShell.GetView().GetViewFrame().GetBindings().Invalidate(FN_NAVIGATION_BACK);
if (bForwardWasEnabled)
m_rMyShell.GetView().GetViewFrame().GetBindings().Invalidate(FN_NAVIGATION_FORWARD);
return bRet;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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