[2] | 1 | /****************************************************************************
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| 2 | **
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[846] | 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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[561] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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[2] | 6 | **
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| 7 | ** This file is part of the QtGui module of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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[561] | 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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[2] | 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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[561] | 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at [email protected].
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[2] | 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include "qundogroup.h"
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| 43 | #include "qundostack.h"
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| 44 | #include "qundostack_p.h"
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| 45 |
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| 46 | #ifndef QT_NO_UNDOGROUP
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| 47 |
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| 48 | QT_BEGIN_NAMESPACE
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| 49 |
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| 50 | class QUndoGroupPrivate : public QObjectPrivate
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| 51 | {
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| 52 | Q_DECLARE_PUBLIC(QUndoGroup)
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| 53 | public:
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| 54 | QUndoGroupPrivate() : active(0) {}
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| 55 |
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| 56 | QUndoStack *active;
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| 57 | QList<QUndoStack*> stack_list;
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| 58 | };
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| 59 |
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| 60 | /*!
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| 61 | \class QUndoGroup
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| 62 | \brief The QUndoGroup class is a group of QUndoStack objects.
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| 63 | \since 4.2
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| 64 |
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| 65 | For an overview of the Qt's undo framework, see the
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| 66 | \link qundo.html overview\endlink.
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| 67 |
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| 68 | An application often has multiple undo stacks, one for each opened document. At the
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| 69 | same time, an application usually has one undo action and one redo action, which
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| 70 | triggers undo or redo in the active document.
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| 71 |
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| 72 | QUndoGroup is a group of QUndoStack objects, one of which may be active. It has
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| 73 | an undo() and redo() slot, which calls QUndoStack::undo() and QUndoStack::redo()
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| 74 | for the active stack. It also has the functions createUndoAction() and createRedoAction().
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| 75 | The actions returned by these functions behave in the same way as those returned by
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| 76 | QUndoStack::createUndoAction() and QUndoStack::createRedoAction() of the active
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| 77 | stack.
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| 78 |
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| 79 | Stacks are added to a group with addStack() and removed with removeStack(). A stack
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| 80 | is implicitly added to a group when it is created with the group as its parent
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| 81 | QObject.
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| 82 |
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| 83 | It is the programmer's responsibility to specify which stack is active by
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| 84 | calling QUndoStack::setActive(), usually when the associated document window receives focus.
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| 85 | The active stack may also be set with setActiveStack(), and is returned by activeStack().
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| 86 |
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| 87 | When a stack is added to a group using addStack(), the group does not take ownership
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| 88 | of the stack. This means the stack has to be deleted separately from the group. When
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| 89 | a stack is deleted, it is automatically removed from a group. A stack may belong to
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| 90 | only one group. Adding it to another group will cause it to be removed from the previous
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| 91 | group.
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| 92 |
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| 93 | A QUndoGroup is also useful in conjunction with QUndoView. If a QUndoView is
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| 94 | set to watch a group using QUndoView::setGroup(), it will update itself to display
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| 95 | the active stack.
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| 96 | */
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| 97 |
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| 98 | /*!
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| 99 | Creates an empty QUndoGroup object with parent \a parent.
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| 100 |
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| 101 | \sa addStack()
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| 102 | */
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| 103 |
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| 104 | QUndoGroup::QUndoGroup(QObject *parent)
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| 105 | : QObject(*new QUndoGroupPrivate(), parent)
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| 106 | {
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| 107 | }
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| 108 |
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| 109 | /*!
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| 110 | Destroys the QUndoGroup.
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| 111 | */
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| 112 | QUndoGroup::~QUndoGroup()
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| 113 | {
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| 114 | // Ensure all QUndoStacks no longer refer to this group.
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| 115 | Q_D(QUndoGroup);
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| 116 | QList<QUndoStack *>::iterator it = d->stack_list.begin();
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| 117 | QList<QUndoStack *>::iterator end = d->stack_list.end();
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| 118 | while (it != end) {
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| 119 | (*it)->d_func()->group = 0;
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| 120 | ++it;
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| 121 | }
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| 122 | }
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| 123 |
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| 124 | /*!
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| 125 | Adds \a stack to this group. The group does not take ownership of the stack. Another
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| 126 | way of adding a stack to a group is by specifying the group as the stack's parent
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| 127 | QObject in QUndoStack::QUndoStack(). In this case, the stack is deleted when the
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| 128 | group is deleted, in the usual manner of QObjects.
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| 129 |
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| 130 | \sa removeStack() stacks() QUndoStack::QUndoStack()
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| 131 | */
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| 132 |
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| 133 | void QUndoGroup::addStack(QUndoStack *stack)
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| 134 | {
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| 135 | Q_D(QUndoGroup);
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| 136 |
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| 137 | if (d->stack_list.contains(stack))
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| 138 | return;
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| 139 | d->stack_list.append(stack);
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| 140 |
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| 141 | if (QUndoGroup *other = stack->d_func()->group)
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| 142 | other->removeStack(stack);
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| 143 | stack->d_func()->group = this;
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| 144 | }
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| 145 |
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| 146 | /*!
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| 147 | Removes \a stack from this group. If the stack was the active stack in the group,
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| 148 | the active stack becomes 0.
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| 149 |
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| 150 | \sa addStack() stacks() QUndoStack::~QUndoStack()
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| 151 | */
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| 152 |
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| 153 | void QUndoGroup::removeStack(QUndoStack *stack)
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| 154 | {
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| 155 | Q_D(QUndoGroup);
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| 156 |
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| 157 | if (d->stack_list.removeAll(stack) == 0)
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| 158 | return;
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| 159 | if (stack == d->active)
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| 160 | setActiveStack(0);
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| 161 | stack->d_func()->group = 0;
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| 162 | }
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| 163 |
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| 164 | /*!
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| 165 | Returns a list of stacks in this group.
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| 166 |
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| 167 | \sa addStack() removeStack()
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| 168 | */
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| 169 |
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| 170 | QList<QUndoStack*> QUndoGroup::stacks() const
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| 171 | {
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| 172 | Q_D(const QUndoGroup);
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| 173 | return d->stack_list;
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| 174 | }
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| 175 |
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| 176 | /*!
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| 177 | Sets the active stack of this group to \a stack.
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| 178 |
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| 179 | If the stack is not a member of this group, this function does nothing.
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| 180 |
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| 181 | Synonymous with calling QUndoStack::setActive() on \a stack.
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| 182 |
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| 183 | The actions returned by createUndoAction() and createRedoAction() will now behave
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| 184 | in the same way as those returned by \a stack's QUndoStack::createUndoAction()
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| 185 | and QUndoStack::createRedoAction().
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| 186 |
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| 187 | \sa QUndoStack::setActive() activeStack()
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| 188 | */
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| 189 |
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| 190 | void QUndoGroup::setActiveStack(QUndoStack *stack)
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| 191 | {
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| 192 | Q_D(QUndoGroup);
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| 193 | if (d->active == stack)
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| 194 | return;
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| 195 |
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| 196 | if (d->active != 0) {
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| 197 | disconnect(d->active, SIGNAL(canUndoChanged(bool)),
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| 198 | this, SIGNAL(canUndoChanged(bool)));
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| 199 | disconnect(d->active, SIGNAL(undoTextChanged(QString)),
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| 200 | this, SIGNAL(undoTextChanged(QString)));
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| 201 | disconnect(d->active, SIGNAL(canRedoChanged(bool)),
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| 202 | this, SIGNAL(canRedoChanged(bool)));
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| 203 | disconnect(d->active, SIGNAL(redoTextChanged(QString)),
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| 204 | this, SIGNAL(redoTextChanged(QString)));
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| 205 | disconnect(d->active, SIGNAL(indexChanged(int)),
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| 206 | this, SIGNAL(indexChanged(int)));
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| 207 | disconnect(d->active, SIGNAL(cleanChanged(bool)),
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| 208 | this, SIGNAL(cleanChanged(bool)));
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| 209 | }
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| 210 |
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| 211 | d->active = stack;
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| 212 |
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| 213 | if (d->active == 0) {
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| 214 | emit canUndoChanged(false);
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| 215 | emit undoTextChanged(QString());
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| 216 | emit canRedoChanged(false);
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| 217 | emit redoTextChanged(QString());
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| 218 | emit cleanChanged(true);
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| 219 | emit indexChanged(0);
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| 220 | } else {
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| 221 | connect(d->active, SIGNAL(canUndoChanged(bool)),
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| 222 | this, SIGNAL(canUndoChanged(bool)));
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| 223 | connect(d->active, SIGNAL(undoTextChanged(QString)),
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| 224 | this, SIGNAL(undoTextChanged(QString)));
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| 225 | connect(d->active, SIGNAL(canRedoChanged(bool)),
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| 226 | this, SIGNAL(canRedoChanged(bool)));
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| 227 | connect(d->active, SIGNAL(redoTextChanged(QString)),
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| 228 | this, SIGNAL(redoTextChanged(QString)));
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| 229 | connect(d->active, SIGNAL(indexChanged(int)),
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| 230 | this, SIGNAL(indexChanged(int)));
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| 231 | connect(d->active, SIGNAL(cleanChanged(bool)),
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| 232 | this, SIGNAL(cleanChanged(bool)));
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| 233 | emit canUndoChanged(d->active->canUndo());
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| 234 | emit undoTextChanged(d->active->undoText());
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| 235 | emit canRedoChanged(d->active->canRedo());
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| 236 | emit redoTextChanged(d->active->redoText());
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| 237 | emit cleanChanged(d->active->isClean());
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| 238 | emit indexChanged(d->active->index());
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| 239 | }
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| 240 |
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| 241 | emit activeStackChanged(d->active);
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| 242 | }
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| 243 |
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| 244 | /*!
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| 245 | Returns the active stack of this group.
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| 246 |
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| 247 | If none of the stacks are active, or if the group is empty, this function
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| 248 | returns 0.
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| 249 |
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| 250 | \sa setActiveStack() QUndoStack::setActive()
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| 251 | */
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| 252 |
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| 253 | QUndoStack *QUndoGroup::activeStack() const
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| 254 | {
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| 255 | Q_D(const QUndoGroup);
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| 256 | return d->active;
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| 257 | }
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| 258 |
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| 259 | /*!
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| 260 | Calls QUndoStack::undo() on the active stack.
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| 261 |
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| 262 | If none of the stacks are active, or if the group is empty, this function
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| 263 | does nothing.
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| 264 |
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| 265 | \sa redo() canUndo() setActiveStack()
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| 266 | */
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| 267 |
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| 268 | void QUndoGroup::undo()
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| 269 | {
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| 270 | Q_D(QUndoGroup);
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| 271 | if (d->active != 0)
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| 272 | d->active->undo();
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| 273 | }
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| 274 |
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| 275 | /*!
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| 276 | Calls QUndoStack::redo() on the active stack.
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| 277 |
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| 278 | If none of the stacks are active, or if the group is empty, this function
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| 279 | does nothing.
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| 280 |
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| 281 | \sa undo() canRedo() setActiveStack()
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| 282 | */
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| 283 |
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| 284 |
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| 285 | void QUndoGroup::redo()
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| 286 | {
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| 287 | Q_D(QUndoGroup);
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| 288 | if (d->active != 0)
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| 289 | d->active->redo();
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| 290 | }
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| 291 |
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| 292 | /*!
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| 293 | Returns the value of the active stack's QUndoStack::canUndo().
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| 294 |
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| 295 | If none of the stacks are active, or if the group is empty, this function
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| 296 | returns false.
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| 297 |
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| 298 | \sa canRedo() setActiveStack()
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| 299 | */
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| 300 |
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| 301 | bool QUndoGroup::canUndo() const
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| 302 | {
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| 303 | Q_D(const QUndoGroup);
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| 304 | return d->active != 0 && d->active->canUndo();
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| 305 | }
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| 306 |
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| 307 | /*!
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| 308 | Returns the value of the active stack's QUndoStack::canRedo().
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| 309 |
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| 310 | If none of the stacks are active, or if the group is empty, this function
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| 311 | returns false.
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| 312 |
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| 313 | \sa canUndo() setActiveStack()
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| 314 | */
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| 315 |
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| 316 | bool QUndoGroup::canRedo() const
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| 317 | {
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| 318 | Q_D(const QUndoGroup);
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| 319 | return d->active != 0 && d->active->canRedo();
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| 320 | }
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| 321 |
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| 322 | /*!
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| 323 | Returns the value of the active stack's QUndoStack::undoText().
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| 324 |
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| 325 | If none of the stacks are active, or if the group is empty, this function
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| 326 | returns an empty string.
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| 327 |
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| 328 | \sa redoText() setActiveStack()
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| 329 | */
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| 330 |
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| 331 | QString QUndoGroup::undoText() const
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| 332 | {
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| 333 | Q_D(const QUndoGroup);
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| 334 | return d->active == 0 ? QString() : d->active->undoText();
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| 335 | }
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| 336 |
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| 337 | /*!
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| 338 | Returns the value of the active stack's QUndoStack::redoText().
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| 339 |
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| 340 | If none of the stacks are active, or if the group is empty, this function
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| 341 | returns an empty string.
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| 342 |
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| 343 | \sa undoText() setActiveStack()
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| 344 | */
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| 345 |
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| 346 | QString QUndoGroup::redoText() const
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| 347 | {
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| 348 | Q_D(const QUndoGroup);
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| 349 | return d->active == 0 ? QString() : d->active->redoText();
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| 350 | }
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| 351 |
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| 352 | /*!
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| 353 | Returns the value of the active stack's QUndoStack::isClean().
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| 354 |
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| 355 | If none of the stacks are active, or if the group is empty, this function
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| 356 | returns true.
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| 357 |
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| 358 | \sa setActiveStack()
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| 359 | */
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| 360 |
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| 361 | bool QUndoGroup::isClean() const
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| 362 | {
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| 363 | Q_D(const QUndoGroup);
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| 364 | return d->active == 0 || d->active->isClean();
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| 365 | }
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| 366 |
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| 367 | #ifndef QT_NO_ACTION
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| 368 |
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| 369 | /*!
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| 370 | Creates an undo QAction object with parent \a parent.
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| 371 |
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| 372 | Triggering this action will cause a call to QUndoStack::undo() on the active stack.
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| 373 | The text of this action will always be the text of the command which will be undone
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| 374 | in the next call to undo(), prefixed by \a prefix. If there is no command available
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| 375 | for undo, if the group is empty or if none of the stacks are active, this action will
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| 376 | be disabled.
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| 377 |
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| 378 | If \a prefix is empty, the default prefix "Undo" is used.
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| 379 |
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| 380 | \sa createRedoAction() canUndo() QUndoCommand::text()
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| 381 | */
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| 382 |
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| 383 | QAction *QUndoGroup::createUndoAction(QObject *parent, const QString &prefix) const
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| 384 | {
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| 385 | QString pref = prefix.isEmpty() ? tr("Undo") : prefix;
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| 386 | QUndoAction *result = new QUndoAction(pref, parent);
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| 387 | result->setEnabled(canUndo());
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| 388 | result->setPrefixedText(undoText());
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| 389 | connect(this, SIGNAL(canUndoChanged(bool)),
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| 390 | result, SLOT(setEnabled(bool)));
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| 391 | connect(this, SIGNAL(undoTextChanged(QString)),
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| 392 | result, SLOT(setPrefixedText(QString)));
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| 393 | connect(result, SIGNAL(triggered()), this, SLOT(undo()));
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| 394 | return result;
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| 395 | }
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| 396 |
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| 397 | /*!
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| 398 | Creates an redo QAction object with parent \a parent.
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| 399 |
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| 400 | Triggering this action will cause a call to QUndoStack::redo() on the active stack.
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| 401 | The text of this action will always be the text of the command which will be redone
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| 402 | in the next call to redo(), prefixed by \a prefix. If there is no command available
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| 403 | for redo, if the group is empty or if none of the stacks are active, this action will
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| 404 | be disabled.
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| 405 |
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| 406 | If \a prefix is empty, the default prefix "Undo" is used.
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| 407 |
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| 408 | \sa createUndoAction() canRedo() QUndoCommand::text()
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| 409 | */
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| 410 |
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| 411 | QAction *QUndoGroup::createRedoAction(QObject *parent, const QString &prefix) const
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| 412 | {
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| 413 | QString pref = prefix.isEmpty() ? tr("Redo") : prefix;
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| 414 | QUndoAction *result = new QUndoAction(pref, parent);
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| 415 | result->setEnabled(canRedo());
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| 416 | result->setPrefixedText(redoText());
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| 417 | connect(this, SIGNAL(canRedoChanged(bool)),
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| 418 | result, SLOT(setEnabled(bool)));
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| 419 | connect(this, SIGNAL(redoTextChanged(QString)),
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| 420 | result, SLOT(setPrefixedText(QString)));
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| 421 | connect(result, SIGNAL(triggered()), this, SLOT(redo()));
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| 422 | return result;
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| 423 | }
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| 424 |
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| 425 | #endif // QT_NO_ACTION
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| 426 |
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| 427 | /*! \fn void QUndoGroup::activeStackChanged(QUndoStack *stack)
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| 428 |
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| 429 | This signal is emitted whenever the active stack of the group changes. This can happen
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| 430 | when setActiveStack() or QUndoStack::setActive() is called, or when the active stack
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| 431 | is removed form the group. \a stack is the new active stack. If no stack is active,
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| 432 | \a stack is 0.
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| 433 |
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| 434 | \sa setActiveStack() QUndoStack::setActive()
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| 435 | */
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| 436 |
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| 437 | /*! \fn void QUndoGroup::indexChanged(int idx)
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| 438 |
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| 439 | This signal is emitted whenever the active stack emits QUndoStack::indexChanged()
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| 440 | or the active stack changes.
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| 441 |
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| 442 | \a idx is the new current index, or 0 if the active stack is 0.
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| 443 |
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| 444 | \sa QUndoStack::indexChanged() setActiveStack()
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| 445 | */
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| 446 |
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| 447 | /*! \fn void QUndoGroup::cleanChanged(bool clean)
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| 448 |
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| 449 | This signal is emitted whenever the active stack emits QUndoStack::cleanChanged()
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| 450 | or the active stack changes.
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| 451 |
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| 452 | \a clean is the new state, or true if the active stack is 0.
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| 453 |
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| 454 | \sa QUndoStack::cleanChanged() setActiveStack()
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| 455 | */
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| 456 |
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| 457 | /*! \fn void QUndoGroup::canUndoChanged(bool canUndo)
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| 458 |
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| 459 | This signal is emitted whenever the active stack emits QUndoStack::canUndoChanged()
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| 460 | or the active stack changes.
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| 461 |
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| 462 | \a canUndo is the new state, or false if the active stack is 0.
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| 463 |
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| 464 | \sa QUndoStack::canUndoChanged() setActiveStack()
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| 465 | */
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| 466 |
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| 467 | /*! \fn void QUndoGroup::canRedoChanged(bool canRedo)
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| 468 |
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| 469 | This signal is emitted whenever the active stack emits QUndoStack::canRedoChanged()
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| 470 | or the active stack changes.
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| 471 |
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| 472 | \a canRedo is the new state, or false if the active stack is 0.
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| 473 |
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| 474 | \sa QUndoStack::canRedoChanged() setActiveStack()
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| 475 | */
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| 476 |
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| 477 | /*! \fn void QUndoGroup::undoTextChanged(const QString &undoText)
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| 478 |
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| 479 | This signal is emitted whenever the active stack emits QUndoStack::undoTextChanged()
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| 480 | or the active stack changes.
|
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| 481 |
|
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| 482 | \a undoText is the new state, or an empty string if the active stack is 0.
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| 483 |
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| 484 | \sa QUndoStack::undoTextChanged() setActiveStack()
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| 485 | */
|
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| 486 |
|
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| 487 | /*! \fn void QUndoGroup::redoTextChanged(const QString &redoText)
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| 488 |
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| 489 | This signal is emitted whenever the active stack emits QUndoStack::redoTextChanged()
|
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| 490 | or the active stack changes.
|
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| 491 |
|
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| 492 | \a redoText is the new state, or an empty string if the active stack is 0.
|
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| 493 |
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| 494 | \sa QUndoStack::redoTextChanged() setActiveStack()
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| 495 | */
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| 496 |
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| 497 | QT_END_NAMESPACE
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| 498 |
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| 499 | #endif // QT_NO_UNDOGROUP
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