/
qgslayertreemodellegendnode.h
670 lines (543 loc) · 20.4 KB
/
qgslayertreemodellegendnode.h
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
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
/***************************************************************************
qgslayertreemodellegendnode.h
--------------------------------------
Date : August 2014
Copyright : (C) 2014 by Martin Dobias
Email : wonder dot sk at gmail dot com
QgsWMSLegendNode : Sandro Santilli < strk at keybit dot net >
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef QGSLAYERTREEMODELLEGENDNODE_H
#define QGSLAYERTREEMODELLEGENDNODE_H
#include <QIcon>
#include <QObject>
#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgsrasterdataprovider.h" // for QgsImageFetcher dtor visibility
#include "qgsexpressioncontext.h"
#include "qgslegendpatchshape.h"
class QgsLayerTreeLayer;
class QgsLayerTreeModel;
class QgsLegendSettings;
class QgsMapSettings;
class QgsSymbol;
class QgsRenderContext;
/**
* \ingroup core
* The QgsLegendRendererItem class is abstract interface for legend items
* returned from QgsMapLayerLegend implementation.
*
* The objects are used in QgsLayerTreeModel. Custom implementations may offer additional interactivity
* and customized look.
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsLayerTreeModelLegendNode : public QObject
{
Q_OBJECT
#ifdef SIP_RUN
SIP_CONVERT_TO_SUBCLASS_CODE
if ( qobject_cast<QgsSymbolLegendNode *> ( sipCpp ) )
sipType = sipType_QgsSymbolLegendNode;
else
sipType = 0;
SIP_END
#endif
public:
enum LegendNodeRoles
{
RuleKeyRole = Qt::UserRole, //!< Rule key of the node (QString)
ParentRuleKeyRole //!< Rule key of the parent legend node - for legends with tree hierarchy (QString). Added in 2.8
};
//! Returns pointer to the parent layer node
QgsLayerTreeLayer *layerNode() const { return mLayerNode; }
//! Returns pointer to model owning this legend node
QgsLayerTreeModel *model() const;
//! Returns item flags associated with the item. Default implementation returns Qt::ItemIsEnabled.
virtual Qt::ItemFlags flags() const;
//! Returns data associated with the item. Must be implemented in derived class.
virtual QVariant data( int role ) const = 0;
//! Sets some data associated with the item. Default implementation does nothing and returns FALSE.
virtual bool setData( const QVariant &value, int role );
virtual bool isEmbeddedInParent() const { return mEmbeddedInParent; }
virtual void setEmbeddedInParent( bool embedded ) { mEmbeddedInParent = embedded; }
virtual QString userLabel() const { return mUserLabel; }
virtual void setUserLabel( const QString &userLabel ) { mUserLabel = userLabel; }
/**
* Returns the user (overridden) size for the legend node.
*
* If either the width or height are non-zero, they will be used when rendering the legend node instead of the default
* symbol width or height from QgsLegendSettings.
*
* \see setUserPatchSize()
* \since QGIS 3.14
*/
virtual QSizeF userPatchSize() const;
/**
* Sets the user (overridden) \a size for the legend node.
*
* If either the width or height are non-zero, they will be used when rendering the legend node instead of the default
* symbol width or height from QgsLegendSettings.
*
* \see userPatchSize()
* \since QGIS 3.14
*/
virtual void setUserPatchSize( QSizeF size );
/**
* Sets whether a forced column break should occur before the node.
*
* \see columnBreak()
* \since QGIS 3.14
*/
virtual void setColumnBreak( bool breakBeforeNode ) { mColumnBreakBeforeNode = breakBeforeNode; }
/**
* Returns whether a forced column break should occur before the node.
*
* \see setColumnBreak()
* \since QGIS 3.14
*/
virtual bool columnBreak() const { return mColumnBreakBeforeNode; }
virtual bool isScaleOK( double scale ) const { Q_UNUSED( scale ) return true; }
/**
* Notification from model that information from associated map view has changed.
* Default implementation does nothing.
*/
virtual void invalidateMapBasedData() {}
struct ItemContext
{
Q_NOWARN_DEPRECATED_PUSH //because of deprecated members
ItemContext() = default;
Q_NOWARN_DEPRECATED_POP
//! Render context, if available
QgsRenderContext *context = nullptr;
//! Painter
QPainter *painter = nullptr;
/**
* Top-left corner of the legend item.
* \deprecated Use top, columnLeft, columnRight instead.
*/
Q_DECL_DEPRECATED QPointF point;
/**
* Offset from the left side where label should start.
* \deprecated use columnLeft, columnRight instead.
*/
Q_DECL_DEPRECATED double labelXOffset = 0.0;
/**
* Top y-position of legend item.
* \since QGIS 3.10
*/
double top = 0.0;
/**
* Left side of current legend column. This should be used when determining
* where to render legend item content, correctly respecting the symbol and text
* alignment from the legend settings.
* \since QGIS 3.10
*/
double columnLeft = 0.0;
/**
* Right side of current legend column. This should be used when determining
* where to render legend item content, correctly respecting the symbol and text
* alignment from the legend settings.
* \since QGIS 3.10
*/
double columnRight = 0.0;
/**
* Largest symbol width, considering all other sibling legend components associated with
* the current component.
* \since QGIS 3.10
*/
double maxSiblingSymbolWidth = 0.0;
/**
* The patch shape to render for the node.
*
* \since QGIS 3.14
*/
QgsLegendPatchShape patchShape;
/**
* Symbol patch size to render for the node.
*
* If either the width or height are zero, then the default width/height from QgsLegendSettings::symbolSize() should be used instead.
*
* \since QGIS 3.14
*/
QSizeF patchSize;
};
struct ItemMetrics
{
QSizeF symbolSize;
QSizeF labelSize;
};
/**
* Entry point called from QgsLegendRenderer to do the rendering.
* Default implementation calls drawSymbol() and drawSymbolText() methods.
*
* If ctx is NULLPTR, this is just first stage when preparing layout - without actual rendering.
*/
virtual ItemMetrics draw( const QgsLegendSettings &settings, ItemContext *ctx );
/**
* Entry point called from QgsLegendRenderer to do the rendering in a
* JSON object.
* \param settings Legend layout configuration
* \param context Rendering context
* \since QGIS 3.8
*/
QJsonObject exportToJson( const QgsLegendSettings &settings, const QgsRenderContext &context );
/**
* Draws symbol on the left side of the item
* \param settings Legend layout configuration
* \param ctx Context for rendering - may be NULLPTR if only doing layout without actual rendering
* \param itemHeight Minimal height of the legend item - used for correct positioning when rendering
* \returns Real size of the symbol (may be bigger than "normal" symbol size from settings)
*/
virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
/**
* Adds a symbol in base64 string within a JSON object with the key "icon".
* \param settings Legend layout configuration
* \param context Rendering context
* \since QGIS 3.8
*/
virtual QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const;
/**
* Draws label on the right side of the item
* \param settings Legend layout configuration
* \param ctx Context for rendering - may be NULLPTR if only doing layout without actual rendering
* \param symbolSize Real size of the associated symbol - used for correct positioning when rendering
* \returns Size of the label (may span multiple lines)
*/
virtual QSizeF drawSymbolText( const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize ) const;
signals:
//! Emitted on internal data change so the layer tree model can forward the signal to views
void dataChanged();
/**
* Emitted when the size of this node changes.
*
* \since QGIS 3.16
*/
void sizeChanged();
protected:
//! Construct the node with pointer to its parent layer node
explicit QgsLayerTreeModelLegendNode( QgsLayerTreeLayer *nodeL, QObject *parent SIP_TRANSFERTHIS = nullptr );
//! Returns a temporary context or NULLPTR if legendMapViewData are not valid
QgsRenderContext *createTemporaryRenderContext() const SIP_FACTORY;
protected:
QgsLayerTreeLayer *mLayerNode = nullptr;
bool mEmbeddedInParent;
QString mUserLabel;
QgsLegendPatchShape mPatchShape;
QSizeF mUserSize;
bool mColumnBreakBeforeNode = false;
};
#include "qgslegendsymbolitem.h"
#include "qgstextformat.h"
/**
* \ingroup core
* Implementation of legend node interface for displaying preview of vector symbols and their labels
* and allowing interaction with the symbol / renderer.
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsSymbolLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsSymbolLegendNode.
* \param nodeLayer layer node
* \param item the legend symbol item
* \param parent attach a parent QObject to the legend node.
*/
QgsSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsLegendSymbolItem &item, QObject *parent SIP_TRANSFERTHIS = nullptr );
Qt::ItemFlags flags() const override;
QVariant data( int role ) const override;
bool setData( const QVariant &value, int role ) override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
void setEmbeddedInParent( bool embedded ) override;
void setUserLabel( const QString &userLabel ) override { mUserLabel = userLabel; updateLabel(); }
bool isScaleOK( double scale ) const override { return mItem.isScaleOK( scale ); }
void invalidateMapBasedData() override;
/**
* Set the icon size
* \since QGIS 2.10
*/
void setIconSize( QSize sz ) { mIconSize = sz; }
//! \since QGIS 2.10
QSize iconSize() const { return mIconSize; }
/**
* Calculates the minimum icon size to prevent cropping. When evaluating
* the size for multiple icons it is more efficient to create a single
* render context in advance and use the variant which accepts a QgsRenderContext
* argument.
* \since QGIS 2.10
*/
QSize minimumIconSize() const;
/**
* Calculates the minimum icon size to prevent cropping. When evaluating
* the size for multiple icons it is more efficient to create a single
* render context in advance and call this method instead of minimumIconSize().
* \since QGIS 2.18
*/
QSize minimumIconSize( QgsRenderContext *context ) const;
/**
* Returns the symbol used by the legend node.
* \see setSymbol()
* \since QGIS 2.14
*/
const QgsSymbol *symbol() const;
/**
* Sets the \a symbol to be used by the legend node. The symbol change is also propagated
* to the associated vector layer's renderer.
* \param symbol new symbol for node. Ownership is transferred.
* \see symbol()
* \since QGIS 2.14
*/
void setSymbol( QgsSymbol *symbol SIP_TRANSFER );
/**
* Returns label of text to be shown on top of the symbol.
* \since QGIS 3.2
*/
QString textOnSymbolLabel() const { return mTextOnSymbolLabel; }
/**
* Sets label of text to be shown on top of the symbol.
* \since QGIS 3.2
*/
void setTextOnSymbolLabel( const QString &label ) { mTextOnSymbolLabel = label; }
/**
* Returns text format of the label to be shown on top of the symbol.
* \since QGIS 3.2
*/
QgsTextFormat textOnSymbolTextFormat() const { return mTextOnSymbolTextFormat; }
/**
* Sets format of text to be shown on top of the symbol.
* \since QGIS 3.2
*/
void setTextOnSymbolTextFormat( const QgsTextFormat &format ) { mTextOnSymbolTextFormat = format; }
/**
* Label of the symbol, user defined label will be used, otherwise will default to the label made by QGIS.
* \since QGIS 3.10
*/
QString symbolLabel() const;
/**
* Returns the symbol patch shape to use when rendering the legend node symbol.
*
* \see setPatchShape()
* \since QGIS 3.14
*/
QgsLegendPatchShape patchShape() const;
/**
* Sets the symbol patch \a shape to use when rendering the legend node symbol.
*
* \see patchShape()
* \since QGIS 3.14
*/
void setPatchShape( const QgsLegendPatchShape &shape );
/**
* Returns the node's custom symbol.
*
* If a non-NULLPTR value is returned, then this symbol will be used for rendering
* the legend node instead of the default symbol().
*
* \see setCustomSymbol()
* \since QGIS 3.14
*/
QgsSymbol *customSymbol() const;
/**
* Sets the node's custom \a symbol.
*
* If a non-NULLPTR value is set, then this symbol will be used for rendering
* the legend node instead of the default symbol().
*
* Ownership of \a symbol is transferred.
*
* \see customSymbol()
* \since QGIS 3.14
*/
void setCustomSymbol( QgsSymbol *symbol SIP_TRANSFER );
/**
* Evaluates and returns the text label of the current node
* \param context extra QgsExpressionContext to use for evaluating the expression
* \param label text to evaluate instead of the layer layertree string
* \since QGIS 3.10
*/
QString evaluateLabel( const QgsExpressionContext &context = QgsExpressionContext(), const QString &label = QString() );
public slots:
/**
* Checks all items belonging to the same layer as this node.
* \see uncheckAllItems()
* \see toggleAllItems()
* \since QGIS 2.14
*/
void checkAllItems();
/**
* Unchecks all items belonging to the same layer as this node.
* \see checkAllItems()
* \see toggleAllItems()
* \since QGIS 2.14
*/
void uncheckAllItems();
/**
* Toggle all items belonging to the same layer as this node.
* \see checkAllItems()
* \see uncheckAllItems()
* \since QGIS 3.6
*/
void toggleAllItems();
private:
void updateLabel();
private:
QgsLegendSymbolItem mItem;
mutable QPixmap mPixmap; // cached symbol preview
QString mLabel;
bool mSymbolUsesMapUnits;
QSize mIconSize;
double mSymbolMinimumSize = 0.5;
double mSymbolMaximumSize = 20.0;
QString mTextOnSymbolLabel;
QgsTextFormat mTextOnSymbolTextFormat;
std::unique_ptr< QgsSymbol > mCustomSymbol;
// ident the symbol icon to make it look like a tree structure
static const int INDENT_SIZE = 20;
/**
* Create an expressionContextScope containing symbol related variables
* \since QGIS 3.10
*/
QgsExpressionContextScope *createSymbolScope() const SIP_FACTORY;
/**
* Sets all items belonging to the same layer as this node to the same check state.
* \param state check state
*/
void checkAll( bool state );
};
/**
* \ingroup core
* Implementation of legend node interface for displaying arbitrary label with icon.
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsSimpleLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsSimpleLegendNode.
* \param nodeLayer layer node
* \param label label
* \param icon icon
* \param parent attach a parent QObject to the legend node.
* \param key the rule key
*/
QgsSimpleLegendNode( QgsLayerTreeLayer *nodeLayer, const QString &label, const QIcon &icon = QIcon(), QObject *parent SIP_TRANSFERTHIS = nullptr, const QString &key = QString() );
QVariant data( int role ) const override;
private:
QString mLabel;
QString mId;
QIcon mIcon;
QString mKey;
};
/**
* \ingroup core
* Implementation of legend node interface for displaying arbitrary raster image
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsImageLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsImageLegendNode.
* \param nodeLayer layer node
* \param img the image
* \param parent attach a parent QObject to the legend node.
*/
QgsImageLegendNode( QgsLayerTreeLayer *nodeLayer, const QImage &img, QObject *parent SIP_TRANSFERTHIS = nullptr );
QVariant data( int role ) const override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
private:
QImage mImage;
};
/**
* \ingroup core
* Implementation of legend node interface for displaying raster legend entries
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsRasterSymbolLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsRasterSymbolLegendNode.
* \param nodeLayer layer node
* \param color color
* \param label label
* \param parent attach a parent QObject to the legend node.
*/
QgsRasterSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QColor &color, const QString &label, QObject *parent SIP_TRANSFERTHIS = nullptr );
QVariant data( int role ) const override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
private:
QColor mColor;
QString mLabel;
};
class QgsImageFetcher;
/**
* \ingroup core
* Implementation of legend node interface for displaying WMS legend entries
*
* \since QGIS 2.8
*/
class CORE_EXPORT QgsWmsLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsWmsLegendNode.
* \param nodeLayer layer node
* \param parent attach a parent QObject to the legend node.
*/
QgsWmsLegendNode( QgsLayerTreeLayer *nodeLayer, QObject *parent SIP_TRANSFERTHIS = nullptr );
QVariant data( int role ) const override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
void invalidateMapBasedData() override;
private slots:
void getLegendGraphicFinished( const QImage & );
void getLegendGraphicErrored( const QString & );
void getLegendGraphicProgress( qint64, qint64 );
private:
// Lazily initializes mImage
QImage getLegendGraphic() const;
QImage renderMessage( const QString &msg ) const;
QImage mImage;
bool mValid;
mutable std::unique_ptr<QgsImageFetcher> mFetcher;
};
/**
* \ingroup core
* Produces legend node with a marker symbol
* \since QGIS 3.0
*/
class CORE_EXPORT QgsDataDefinedSizeLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
//! Construct the node using QgsDataDefinedSizeLegend as definition of the node's appearance
QgsDataDefinedSizeLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsDataDefinedSizeLegend &settings, QObject *parent SIP_TRANSFERTHIS = nullptr );
~QgsDataDefinedSizeLegendNode() override;
QVariant data( int role ) const override;
ItemMetrics draw( const QgsLegendSettings &settings, ItemContext *ctx ) override;
private:
void cacheImage() const;
QgsDataDefinedSizeLegend *mSettings = nullptr;
mutable QImage mImage;
};
#endif // QGSLAYERTREEMODELLEGENDNODE_H