QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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qgslayoutmultiframeundocommand.cpp
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1/***************************************************************************
2 qgslayoutmultiframeundocommand.cpp
3 ----------------------
4 begin : October 2017
5 copyright : (C) 2017 by Nyall Dawson
6 email : nyall dot dawson at gmail dot com
7***************************************************************************/
8
9/***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17
19#include "qgslayoutmultiframe.h"
20#include "qgsreadwritecontext.h"
21#include "qgslayout.h"
22#include "qgsproject.h"
23#include "qgsfeedback.h"
24
26QgsLayoutMultiFrameUndoCommand::QgsLayoutMultiFrameUndoCommand( QgsLayoutMultiFrame *frame, const QString &text, int id, QUndoCommand *parent )
27 : QgsAbstractLayoutUndoCommand( text, id, parent )
28 , mFrameUuid( frame->uuid() )
29 , mLayout( frame->layout() )
30 , mItemType( frame->type() )
31{
32
33}
34
35bool QgsLayoutMultiFrameUndoCommand::mergeWith( const QUndoCommand *command )
36{
37 if ( command->id() == 0 )
38 return false;
39
40 const QgsLayoutMultiFrameUndoCommand *c = dynamic_cast<const QgsLayoutMultiFrameUndoCommand *>( command );
41 if ( !c )
42 {
43 return false;
44 }
45 if ( c->multiFrameUuid() != multiFrameUuid() )
46 return false;
47
48 setAfterState( c->afterState() );
49 return true;
50}
51
52void QgsLayoutMultiFrameUndoCommand::saveState( QDomDocument &stateDoc ) const
53{
54 stateDoc.clear();
55 QDomElement documentElement = stateDoc.createElement( QStringLiteral( "ItemState" ) );
56
57 QgsLayoutMultiFrame *item = mLayout->multiFrameByUuid( mFrameUuid );
58 Q_ASSERT_X( item, "QgsLayoutMultiFrameUndoCommand::saveState", "could not retrieve item for saving state" );
59
60 item->writeXml( documentElement, stateDoc, QgsReadWriteContext(), true );
61 stateDoc.appendChild( documentElement );
62}
63
64void QgsLayoutMultiFrameUndoCommand::restoreState( QDomDocument &stateDoc )
65{
66 // find item by uuid...
67 QgsLayoutMultiFrame *item = mLayout->multiFrameByUuid( mFrameUuid );
68 if ( !item )
69 {
70 // uh oh - it's been deleted! we need to create a new instance
71 item = recreateItem( mItemType, mLayout );
72 }
73
74 item->readXml( stateDoc.documentElement().firstChild().toElement(), stateDoc, QgsReadWriteContext(), true );
76 mLayout->project()->setDirty( true );
77}
78
79QgsLayoutMultiFrame *QgsLayoutMultiFrameUndoCommand::recreateItem( int itemType, QgsLayout *layout )
80{
82 mLayout->addMultiFrame( item );
83 return item;
84}
85
86QString QgsLayoutMultiFrameUndoCommand::multiFrameUuid() const
87{
88 return mFrameUuid;
89}
90
91QgsLayout *QgsLayoutMultiFrameUndoCommand::layout() const
92{
93 return mLayout;
94}
95
96
97//
98// QgsLayoutMultiFrameDeleteUndoCommand
99//
100
101QgsLayoutMultiFrameDeleteUndoCommand::QgsLayoutMultiFrameDeleteUndoCommand( QgsLayoutMultiFrame *item, const QString &text, int id, QUndoCommand *parent )
102 : QgsLayoutMultiFrameUndoCommand( item, text, id, parent )
103{
104 saveBeforeState();
105}
106
107bool QgsLayoutMultiFrameDeleteUndoCommand::mergeWith( const QUndoCommand * )
108{
109 return false;
110}
111
112void QgsLayoutMultiFrameDeleteUndoCommand::redo()
113{
114 if ( mFirstRun )
115 {
116 mFirstRun = false;
117 return;
118 }
119
120 QgsLayoutMultiFrame *item = layout()->multiFrameByUuid( multiFrameUuid() );
121 //Q_ASSERT_X( item, "QgsLayoutMultiFrameDeleteUndoCommand::redo", "could not find item to re-delete!" );
122
123 if ( item )
124 {
125 layout()->removeMultiFrame( item );
126 delete item;
127 }
128}
129
130QgsLayoutMultiFrameAddItemCommand::QgsLayoutMultiFrameAddItemCommand( QgsLayoutMultiFrame *frame, const QString &text, int id, QUndoCommand *parent )
131 : QgsLayoutMultiFrameUndoCommand( frame, text, id, parent )
132{
133 saveAfterState();
134}
135
136bool QgsLayoutMultiFrameAddItemCommand::containsChange() const
137{
138 return true;
139}
140
141bool QgsLayoutMultiFrameAddItemCommand::mergeWith( const QUndoCommand * )
142{
143 return false;
144}
145
146void QgsLayoutMultiFrameAddItemCommand::undo()
147{
148 if ( mFirstRun )
149 {
150 mFirstRun = false;
151 return;
152 }
153
154 QgsLayoutMultiFrame *item = layout()->multiFrameByUuid( multiFrameUuid() );
155 if ( item )
156 {
157 layout()->removeMultiFrame( item );
158 delete item;
159 }
160}
161
162
Base class for commands to undo/redo layout and layout object changes.
static QgsLayoutItemRegistry * layoutItemRegistry()
Returns the application's layout item registry, used for layout item types.
QgsLayoutMultiFrame * createMultiFrame(int type, QgsLayout *layout) const
Creates a new instance of a layout multiframe given the multiframe type, and target layout.
Abstract base class for layout items with the ability to distribute the content to several frames (Qg...
bool writeXml(QDomElement &parentElement, QDomDocument &document, const QgsReadWriteContext &context, bool includeFrames=false) const
Stores the multiframe state in a DOM element.
virtual void finalizeRestoreFromXml()
Called after all pending items have been restored from XML.
bool readXml(const QDomElement &itemElement, const QDomDocument &document, const QgsReadWriteContext &context, bool includeFrames=false)
Sets the item state from a DOM element.
Base class for layouts, which can contain items such as maps, labels, scalebars, etc.
Definition qgslayout.h:49
void removeMultiFrame(QgsLayoutMultiFrame *multiFrame)
Removes a multiFrame from the layout (but does not delete it).
QgsLayoutMultiFrame * multiFrameByUuid(const QString &uuid, bool includeTemplateUuids=false) const
Returns the layout multiframe with matching uuid unique identifier, or nullptr if a matching multifra...
The class is used as a container of context for various read/write operations on other objects.
As part of the API refactoring and improvements which landed in the Processing API was substantially reworked from the x version This was done in order to allow much of the underlying Processing framework to be ported into c