1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
/* -*- 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>

#include <com/sun/star/frame/XLayoutManager.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>

// 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()) {
        /* 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()) {
        // 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);

    // show the Navigation toolbar
    css::uno::Reference< css::frame::XFrame > xFrame =
        m_rMyShell.GetView().GetViewFrame()->GetFrame().GetFrameInterface();
    if (xFrame.is())
    {
        css::uno::Reference< css::beans::XPropertySet > xPropSet(xFrame, css::uno::UNO_QUERY);
        if (xPropSet.is())
        {
            css::uno::Reference< css::frame::XLayoutManager > xLayoutManager;
            css::uno::Any aValue = xPropSet->getPropertyValue("LayoutManager");<--- Variable 'aValue' is assigned a value that is never used.

            aValue >>= xLayoutManager;<--- Variable 'aValue' is assigned a value that is never used.
            if (xLayoutManager.is())
            {
                const OUString sResourceURL( "private:resource/toolbar/navigationobjectbar" );
                css::uno::Reference< css::ui::XUIElement > xUIElement = xLayoutManager->getElement(sResourceURL);
                if (!xUIElement.is())
                {
                    xLayoutManager->createElement( sResourceURL );
                    xLayoutManager->showElement( sResourceURL );
                }
            }
        }
    }

    return bRet;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */