/
qgslayertreeview.cpp
384 lines (321 loc) · 12.1 KB
/
qgslayertreeview.cpp
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
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/***************************************************************************
qgslayertreeview.cpp
--------------------------------------
Date : May 2014
Copyright : (C) 2014 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgslayertreeview.h"
#include "qgslayertree.h"
#include "qgslayertreeembeddedwidgetregistry.h"
#include "qgslayertreemodel.h"
#include "qgslayertreemodellegendnode.h"
#include "qgslayertreeviewdefaultactions.h"
#include "qgsmaplayer.h"
#include <QMenu>
#include <QContextMenuEvent>
QgsLayerTreeView::QgsLayerTreeView( QWidget *parent )
: QTreeView( parent )
, mDefaultActions( nullptr )
, mMenuProvider( nullptr )
{
setHeaderHidden( true );
setDragEnabled( true );
setAcceptDrops( true );
setDropIndicatorShown( true );
setEditTriggers( EditKeyPressed );
setExpandsOnDoubleClick( false ); // normally used for other actions
setSelectionMode( ExtendedSelection );
setDefaultDropAction( Qt::MoveAction );
connect( this, SIGNAL( collapsed( QModelIndex ) ), this, SLOT( updateExpandedStateToNode( QModelIndex ) ) );
connect( this, SIGNAL( expanded( QModelIndex ) ), this, SLOT( updateExpandedStateToNode( QModelIndex ) ) );
}
QgsLayerTreeView::~QgsLayerTreeView()
{
delete mMenuProvider;
}
void QgsLayerTreeView::setModel( QAbstractItemModel* model )
{
if ( !qobject_cast<QgsLayerTreeModel*>( model ) )
return;
connect( model, SIGNAL( rowsInserted( QModelIndex, int, int ) ), this, SLOT( modelRowsInserted( QModelIndex, int, int ) ) );
connect( model, SIGNAL( rowsRemoved( QModelIndex, int, int ) ), this, SLOT( modelRowsRemoved() ) );
QTreeView::setModel( model );
connect( layerTreeModel()->rootGroup(), SIGNAL( expandedChanged( QgsLayerTreeNode*, bool ) ), this, SLOT( onExpandedChanged( QgsLayerTreeNode*, bool ) ) );
connect( selectionModel(), SIGNAL( currentChanged( QModelIndex, QModelIndex ) ), this, SLOT( onCurrentChanged() ) );
connect( layerTreeModel(), SIGNAL( modelReset() ), this, SLOT( onModelReset() ) );
updateExpandedStateFromNode( layerTreeModel()->rootGroup() );
}
QgsLayerTreeModel *QgsLayerTreeView::layerTreeModel() const
{
return qobject_cast<QgsLayerTreeModel*>( model() );
}
QgsLayerTreeViewDefaultActions* QgsLayerTreeView::defaultActions()
{
if ( !mDefaultActions )
mDefaultActions = new QgsLayerTreeViewDefaultActions( this );
return mDefaultActions;
}
void QgsLayerTreeView::setMenuProvider( QgsLayerTreeViewMenuProvider* menuProvider )
{
delete mMenuProvider;
mMenuProvider = menuProvider;
}
QgsMapLayer* QgsLayerTreeView::currentLayer() const
{
return layerForIndex( currentIndex() );
}
void QgsLayerTreeView::setCurrentLayer( QgsMapLayer* layer )
{
if ( !layer )
{
setCurrentIndex( QModelIndex() );
return;
}
QgsLayerTreeLayer* nodeLayer = layerTreeModel()->rootGroup()->findLayer( layer->id() );
if ( !nodeLayer )
return;
setCurrentIndex( layerTreeModel()->node2index( nodeLayer ) );
}
void QgsLayerTreeView::contextMenuEvent( QContextMenuEvent *event )
{
if ( !mMenuProvider )
return;
QModelIndex idx = indexAt( event->pos() );
if ( !idx.isValid() )
setCurrentIndex( QModelIndex() );
QMenu* menu = mMenuProvider->createContextMenu();
if ( menu && menu->actions().count() != 0 )
menu->exec( mapToGlobal( event->pos() ) );
delete menu;
}
void QgsLayerTreeView::modelRowsInserted( const QModelIndex& index, int start, int end )
{
QgsLayerTreeNode* parentNode = layerTreeModel()->index2node( index );
if ( !parentNode )
return;
// Embedded widgets - replace placeholders in the model by actual widgets
if ( layerTreeModel()->testFlag( QgsLayerTreeModel::UseEmbeddedWidgets ) && QgsLayerTree::isLayer( parentNode ) )
{
QgsLayerTreeLayer* nodeLayer = QgsLayerTree::toLayer( parentNode );
if ( QgsMapLayer* layer = nodeLayer->layer() )
{
int widgetsCount = layer->customProperty( "embeddedWidgets/count", 0 ).toInt();
QList<QgsLayerTreeModelLegendNode*> legendNodes = layerTreeModel()->layerLegendNodes( nodeLayer );
for ( int i = 0; i < widgetsCount; ++i )
{
QString providerId = layer->customProperty( QString( "embeddedWidgets/%1/id" ).arg( i ) ).toString();
if ( QgsLayerTreeEmbeddedWidgetProvider* provider = QgsLayerTreeEmbeddedWidgetRegistry::instance()->provider( providerId ) )
{
QModelIndex index = layerTreeModel()->legendNode2index( legendNodes[i] );
setIndexWidget( index, provider->createWidget( layer, i ) );
}
}
}
}
if ( QgsLayerTree::isLayer( parentNode ) )
{
// if ShowLegendAsTree flag is enabled in model, we may need to expand some legend nodes
QStringList expandedNodeKeys = parentNode->customProperty( "expandedLegendNodes" ).toStringList();
if ( expandedNodeKeys.isEmpty() )
return;
Q_FOREACH ( QgsLayerTreeModelLegendNode* legendNode, layerTreeModel()->layerLegendNodes( QgsLayerTree::toLayer( parentNode ) ) )
{
QString ruleKey = legendNode->data( QgsLayerTreeModelLegendNode::RuleKeyRole ).toString();
if ( expandedNodeKeys.contains( ruleKey ) )
setExpanded( layerTreeModel()->legendNode2index( legendNode ), true );
}
return;
}
QList<QgsLayerTreeNode*> children = parentNode->children();
for ( int i = start; i <= end; ++i )
{
updateExpandedStateFromNode( children[i] );
}
// make sure we still have correct current layer
onCurrentChanged();
}
void QgsLayerTreeView::modelRowsRemoved()
{
// make sure we still have correct current layer
onCurrentChanged();
}
void QgsLayerTreeView::updateExpandedStateToNode( const QModelIndex& index )
{
if ( QgsLayerTreeNode* node = layerTreeModel()->index2node( index ) )
{
node->setExpanded( isExpanded( index ) );
}
else if ( QgsLayerTreeModelLegendNode* node = layerTreeModel()->index2legendNode( index ) )
{
QString ruleKey = node->data( QgsLayerTreeModelLegendNode::RuleKeyRole ).toString();
QStringList lst = node->layerNode()->customProperty( "expandedLegendNodes" ).toStringList();
bool expanded = isExpanded( index );
bool isInList = lst.contains( ruleKey );
if ( expanded && !isInList )
{
lst.append( ruleKey );
node->layerNode()->setCustomProperty( "expandedLegendNodes", lst );
}
else if ( !expanded && isInList )
{
lst.removeAll( ruleKey );
node->layerNode()->setCustomProperty( "expandedLegendNodes", lst );
}
}
}
void QgsLayerTreeView::onCurrentChanged()
{
QgsMapLayer* layerCurrent = layerForIndex( currentIndex() );
QString layerCurrentID = layerCurrent ? layerCurrent->id() : QString();
if ( mCurrentLayerID == layerCurrentID )
return;
// update the current index in model (the item will be underlined)
QModelIndex nodeLayerIndex;
if ( layerCurrent )
{
QgsLayerTreeLayer* nodeLayer = layerTreeModel()->rootGroup()->findLayer( layerCurrentID );
if ( nodeLayer )
nodeLayerIndex = layerTreeModel()->node2index( nodeLayer );
}
layerTreeModel()->setCurrentIndex( nodeLayerIndex );
mCurrentLayerID = layerCurrentID;
emit currentLayerChanged( layerCurrent );
}
void QgsLayerTreeView::onExpandedChanged( QgsLayerTreeNode* node, bool expanded )
{
QModelIndex idx = layerTreeModel()->node2index( node );
if ( isExpanded( idx ) != expanded )
setExpanded( idx, expanded );
}
void QgsLayerTreeView::onModelReset()
{
updateExpandedStateFromNode( layerTreeModel()->rootGroup() );
}
void QgsLayerTreeView::updateExpandedStateFromNode( QgsLayerTreeNode* node )
{
QModelIndex idx = layerTreeModel()->node2index( node );
setExpanded( idx, node->isExpanded() );
Q_FOREACH ( QgsLayerTreeNode* child, node->children() )
updateExpandedStateFromNode( child );
}
QgsMapLayer* QgsLayerTreeView::layerForIndex( const QModelIndex& index ) const
{
QgsLayerTreeNode* node = layerTreeModel()->index2node( index );
if ( node )
{
if ( QgsLayerTree::isLayer( node ) )
return QgsLayerTree::toLayer( node )->layer();
}
else
{
// possibly a legend node
QgsLayerTreeModelLegendNode* legendNode = layerTreeModel()->index2legendNode( index );
if ( legendNode )
return legendNode->layerNode()->layer();
}
return nullptr;
}
QgsLayerTreeNode* QgsLayerTreeView::currentNode() const
{
return layerTreeModel()->index2node( selectionModel()->currentIndex() );
}
QgsLayerTreeGroup* QgsLayerTreeView::currentGroupNode() const
{
QgsLayerTreeNode* node = currentNode();
if ( QgsLayerTree::isGroup( node ) )
return QgsLayerTree::toGroup( node );
else if ( QgsLayerTree::isLayer( node ) )
{
QgsLayerTreeNode* parent = node->parent();
if ( QgsLayerTree::isGroup( parent ) )
return QgsLayerTree::toGroup( parent );
}
if ( QgsLayerTreeModelLegendNode* legendNode = layerTreeModel()->index2legendNode( selectionModel()->currentIndex() ) )
{
QgsLayerTreeLayer* parent = legendNode->layerNode();
if ( QgsLayerTree::isGroup( parent->parent() ) )
return QgsLayerTree::toGroup( parent->parent() );
}
return nullptr;
}
QgsLayerTreeModelLegendNode* QgsLayerTreeView::currentLegendNode() const
{
return layerTreeModel()->index2legendNode( selectionModel()->currentIndex() );
}
QList<QgsLayerTreeNode*> QgsLayerTreeView::selectedNodes( bool skipInternal ) const
{
return layerTreeModel()->indexes2nodes( selectionModel()->selectedIndexes(), skipInternal );
}
QList<QgsLayerTreeLayer*> QgsLayerTreeView::selectedLayerNodes() const
{
QList<QgsLayerTreeLayer*> layerNodes;
Q_FOREACH ( QgsLayerTreeNode* node, selectedNodes() )
{
if ( QgsLayerTree::isLayer( node ) )
layerNodes << QgsLayerTree::toLayer( node );
}
return layerNodes;
}
QList<QgsMapLayer*> QgsLayerTreeView::selectedLayers() const
{
QList<QgsMapLayer*> list;
Q_FOREACH ( QgsLayerTreeLayer* node, selectedLayerNodes() )
{
if ( node->layer() )
list << node->layer();
}
return list;
}
void QgsLayerTreeView::refreshLayerSymbology( const QString& layerId )
{
QgsLayerTreeLayer* nodeLayer = layerTreeModel()->rootGroup()->findLayer( layerId );
if ( nodeLayer )
layerTreeModel()->refreshLayerLegend( nodeLayer );
}
static void _expandAllLegendNodes( QgsLayerTreeLayer* nodeLayer, bool expanded, QgsLayerTreeModel* model )
{
// for layers we also need to find out with legend nodes contain some children and make them expanded/collapsed
// if we are collapsing, we just write out an empty list
QStringList lst;
if ( expanded )
{
Q_FOREACH ( QgsLayerTreeModelLegendNode* legendNode, model->layerLegendNodes( nodeLayer ) )
{
QString parentKey = legendNode->data( QgsLayerTreeModelLegendNode::ParentRuleKeyRole ).toString();
if ( !parentKey.isEmpty() && !lst.contains( parentKey ) )
lst << parentKey;
}
}
nodeLayer->setCustomProperty( "expandedLegendNodes", lst );
}
static void _expandAllNodes( QgsLayerTreeGroup* parent, bool expanded, QgsLayerTreeModel* model )
{
Q_FOREACH ( QgsLayerTreeNode* node, parent->children() )
{
node->setExpanded( expanded );
if ( QgsLayerTree::isGroup( node ) )
_expandAllNodes( QgsLayerTree::toGroup( node ), expanded, model );
else if ( QgsLayerTree::isLayer( node ) )
_expandAllLegendNodes( QgsLayerTree::toLayer( node ), expanded, model );
}
}
void QgsLayerTreeView::expandAllNodes()
{
// unfortunately expandAll() does not emit expanded() signals
_expandAllNodes( layerTreeModel()->rootGroup(), true, layerTreeModel() );
expandAll();
}
void QgsLayerTreeView::collapseAllNodes()
{
// unfortunately collapseAll() does not emit collapsed() signals
_expandAllNodes( layerTreeModel()->rootGroup(), false, layerTreeModel() );
collapseAll();
}