-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
qgsexpressionbuilderwidget.cpp
452 lines (390 loc) · 14.7 KB
/
qgsexpressionbuilderwidget.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
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
/***************************************************************************
qgisexpressionbuilderwidget.cpp - A genric expression string builder widget.
--------------------------------------
Date : 29-May-2011
Copyright : (C) 2011 by Nathan Woodrow
Email : woodrow.nathan 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 "qgsexpressionbuilderwidget.h"
#include "qgslogger.h"
#include "qgsexpression.h"
#include "qgsmessageviewer.h"
#include "qgsapplication.h"
#include <QSettings>
#include <QMenu>
#include <QFile>
#include <QTextStream>
QgsExpressionBuilderWidget::QgsExpressionBuilderWidget( QWidget *parent )
: QWidget( parent )
{
setupUi( this );
mValueGroupBox->hide();
// The open and save button are for future.
btnOpen->hide();
btnSave->hide();
highlighter = new QgsExpressionHighlighter( txtExpressionString->document() );
mModel = new QStandardItemModel( );
mProxyModel = new QgsExpressionItemSearchProxy();
mProxyModel->setSourceModel( mModel );
expressionTree->setModel( mProxyModel );
expressionTree->setContextMenuPolicy( Qt::CustomContextMenu );
connect( this, SIGNAL( expressionParsed( bool ) ), this, SLOT( setExpressionState( bool ) ) );
connect( expressionTree, SIGNAL( customContextMenuRequested( const QPoint & ) ), this, SLOT( showContextMenu( const QPoint & ) ) );
connect( expressionTree->selectionModel(), SIGNAL( currentChanged( const QModelIndex &, const QModelIndex & ) ),
this, SLOT( currentChanged( const QModelIndex &, const QModelIndex & ) ) );
foreach( QPushButton* button, mOperatorsGroupBox->findChildren<QPushButton *>() )
{
connect( button, SIGNAL( pressed() ), this, SLOT( operatorButtonClicked() ) );
}
// TODO Can we move this stuff to QgsExpression, like the functions?
registerItem( tr( "Operators" ), "+", " + " );
registerItem( tr( "Operators" ), "-", " -" );
registerItem( tr( "Operators" ), "*", " * " );
registerItem( tr( "Operators" ), "/", " / " );
registerItem( tr( "Operators" ), "%", " % " );
registerItem( tr( "Operators" ), "^", " ^ " );
registerItem( tr( "Operators" ), "=", " = " );
registerItem( tr( "Operators" ), ">", " > " );
registerItem( tr( "Operators" ), "<", " < " );
registerItem( tr( "Operators" ), "<>", " <> " );
registerItem( tr( "Operators" ), "<=", " <= " );
registerItem( tr( "Operators" ), ">=", " >= " );
registerItem( tr( "Operators" ), "||", " || ",
QString( "<b>|| %1</b><br><i>%2</i><br><i>%3:</i>%4" )
.arg( tr( "(String Concatenation)" ) )
.arg( tr( "Joins two values together into a string" ) )
.arg( tr( "Usage" ) )
.arg( tr( "'Dia' || Diameter" ) ) );
registerItem( tr( "Operators" ), "LIKE", " LIKE " );
registerItem( tr( "Operators" ), "ILIKE", " ILIKE " );
registerItem( tr( "Operators" ), "IS", " IS NOT " );
registerItem( tr( "Operators" ), "OR", " OR " );
registerItem( tr( "Operators" ), "AND", " AND " );
registerItem( tr( "Operators" ), "NOT", " NOT " );
// Load the functions from the QgsExpression class
int count = QgsExpression::functionCount();
for ( int i = 0; i < count; i++ )
{
QgsExpression::FunctionDef func = QgsExpression::BuiltinFunctions()[i];
QString name = func.mName;
if ( func.mParams >= 1 )
name += "(";
registerItem( func.mGroup, func.mName, " " + name + " " );
};
}
QgsExpressionBuilderWidget::~QgsExpressionBuilderWidget()
{
}
void QgsExpressionBuilderWidget::setLayer( QgsVectorLayer *layer )
{
mLayer = layer;
}
void QgsExpressionBuilderWidget::currentChanged( const QModelIndex &index, const QModelIndex & )
{
// Get the item
QModelIndex idx = mProxyModel->mapToSource( index );
QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
if ( item == 0 )
return;
// Loading field values are handled with a
// right click so we just show the help.
if ( item->getItemType() != QgsExpressionItem::Field )
{
mValueGroupBox->hide();
mValueListWidget->clear();
}
// Show the help for the current item.
QString help = loadFunctionHelp( item );
txtHelpText->setText( help );
txtHelpText->setToolTip( txtHelpText->toPlainText() );
}
void QgsExpressionBuilderWidget::on_expressionTree_doubleClicked( const QModelIndex &index )
{
QModelIndex idx = mProxyModel->mapToSource( index );
QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
if ( item == 0 )
return;
// Don't handle the double click it we are on a header node.
if ( item->getItemType() == QgsExpressionItem::Header )
return;
// Insert the expression text.
txtExpressionString->insertPlainText( item->getExpressionText() );
}
void QgsExpressionBuilderWidget::loadFieldNames()
{
// TODO We should really return a error the user of the widget that
// the there is no layer set.
if ( !mLayer )
return;
const QgsFieldMap fieldMap = mLayer->pendingFields();
loadFieldNames( fieldMap );
}
void QgsExpressionBuilderWidget::loadFieldNames( QgsFieldMap fields )
{
if ( fields.isEmpty() )
return;
QStringList fieldNames;
foreach( QgsField field, fields )
{
QString fieldName = field.name();
fieldNames << fieldName;
registerItem( tr( "Fields and Values" ), fieldName, " \"" + fieldName + "\" ", "", QgsExpressionItem::Field );
}
highlighter->addFields( fieldNames );
}
void QgsExpressionBuilderWidget::fillFieldValues( int fieldIndex, int countLimit )
{
// TODO We should really return a error the user of the widget that
// the there is no layer set.
if ( !mLayer )
return;
// TODO We should thread this so that we don't hold the user up if the layer is massive.
mValueListWidget->clear();
mValueListWidget->setUpdatesEnabled( false );
mValueListWidget->blockSignals( true );
QList<QVariant> values;
mLayer->uniqueValues( fieldIndex, values, countLimit );
foreach( QVariant value, values )
{
mValueListWidget->addItem( value.toString() );
}
mValueListWidget->setUpdatesEnabled( true );
mValueListWidget->blockSignals( false );
}
void QgsExpressionBuilderWidget::registerItem( QString group,
QString label,
QString expressionText,
QString helpText,
QgsExpressionItem::ItemType type )
{
QgsExpressionItem* item = new QgsExpressionItem( label, expressionText, helpText, type );
// Look up the group and insert the new function.
if ( mExpressionGroups.contains( group ) )
{
QgsExpressionItem* groupNode = mExpressionGroups.value( group );
groupNode->appendRow( item );
}
else
{
// If the group doesn't exsit yet we make it first.
QgsExpressionItem* newgroupNode = new QgsExpressionItem( group, "", QgsExpressionItem::Header );
newgroupNode->appendRow( item );
mModel->appendRow( newgroupNode );
mExpressionGroups.insert( group , newgroupNode );
}
}
bool QgsExpressionBuilderWidget::isExpressionValid()
{
return mExpressionValid;
}
QString QgsExpressionBuilderWidget::expressionText()
{
return txtExpressionString->toPlainText();
}
void QgsExpressionBuilderWidget::setExpressionText( const QString& expression )
{
txtExpressionString->setPlainText( expression );
}
void QgsExpressionBuilderWidget::on_txtExpressionString_textChanged()
{
QString text = txtExpressionString->toPlainText();
// If the string is empty the expression will still "fail" although
// we don't show the user an error as it will be confusing.
if ( text.isEmpty() )
{
lblPreview->setText( "" );
lblPreview->setStyleSheet( "" );
txtExpressionString->setToolTip( "" );
lblPreview->setToolTip( "" );
emit expressionParsed( false );
return;
}
QgsExpression exp( text );
// TODO We could do this without a layer.
// Maybe just calling exp.evaluate()?
if ( mLayer )
{
if ( !mFeature.isValid() )
{
mLayer->select( mLayer->pendingAllAttributesList(), QgsRectangle(), mLayer->geometryType() != QGis::NoGeometry && exp.needsGeometry() );
mLayer->nextFeature( mFeature );
}
if ( mFeature.isValid() )
{
QVariant value = exp.evaluate( &mFeature, mLayer->pendingFields() );
if ( !exp.hasEvalError() )
lblPreview->setText( value.toString() );
}
else
{
// The feature is invalid because we don't have one but that doesn't mean user can't
// build a expression string. They just get no preview.
lblPreview->setText( "" );
}
}
if ( exp.hasParserError() || exp.hasEvalError() )
{
QString tooltip = QString( "<b>%1:</b><br>%2" ).arg( tr( "Parser Error" ) ).arg( exp.parserErrorString() );
if ( exp.hasEvalError() )
tooltip += QString( "<br><br><b>%1:</b><br>%2" ).arg( tr( "Eval Error" ) ).arg( exp.evalErrorString() );
lblPreview->setText( tr( "Expression is invalid <a href=""more"">(more info)</a>" ) );
lblPreview->setStyleSheet( "color: rgba(255, 6, 10, 255);" );
txtExpressionString->setToolTip( tooltip );
lblPreview->setToolTip( tooltip );
emit expressionParsed( false );
return;
}
else
{
lblPreview->setStyleSheet( "" );
txtExpressionString->setToolTip( "" );
lblPreview->setToolTip( "" );
emit expressionParsed( true );
}
}
void QgsExpressionBuilderWidget::on_txtSearchEdit_textChanged()
{
mProxyModel->setFilterWildcard( txtSearchEdit->text() );
if ( txtSearchEdit->text().isEmpty() )
expressionTree->collapseAll();
else
expressionTree->expandAll();
}
void QgsExpressionBuilderWidget::on_lblPreview_linkActivated( QString link )
{
Q_UNUSED( link );
QgsMessageViewer * mv = new QgsMessageViewer( this );
mv->setWindowTitle( tr( "More info on expression error" ) );
mv->setMessageAsHtml( txtExpressionString->toolTip() );
mv->exec();
}
void QgsExpressionBuilderWidget::on_mValueListWidget_itemDoubleClicked( QListWidgetItem *item )
{
txtExpressionString->insertPlainText( " " + item->text() + " " );
}
void QgsExpressionBuilderWidget::operatorButtonClicked()
{
QPushButton* button = dynamic_cast<QPushButton*>( sender() );
txtExpressionString->insertPlainText( " " + button->text() + " " );
}
void QgsExpressionBuilderWidget::showContextMenu( const QPoint & pt )
{
QModelIndex idx = expressionTree->indexAt( pt );
idx = mProxyModel->mapToSource( idx );
QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
if ( !item )
return;
if ( item->getItemType() == QgsExpressionItem::Field )
{
QMenu* menu = new QMenu( this );
menu->addAction( tr( "Load top 10 unique values" ), this, SLOT( loadSampleValues() ) );
menu->addAction( tr( "Load all unique values" ), this, SLOT( loadAllValues() ) );
menu->popup( expressionTree->mapToGlobal( pt ) );
}
}
void QgsExpressionBuilderWidget::loadSampleValues()
{
QModelIndex idx = mProxyModel->mapToSource( expressionTree->currentIndex() );
QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
// TODO We should really return a error the user of the widget that
// the there is no layer set.
if ( !mLayer )
return;
mValueGroupBox->show();
int fieldIndex = mLayer->fieldNameIndex( item->text() );
fillFieldValues( fieldIndex, 10 );
}
void QgsExpressionBuilderWidget::loadAllValues()
{
QModelIndex idx = mProxyModel->mapToSource( expressionTree->currentIndex() );
QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
// TODO We should really return a error the user of the widget that
// the there is no layer set.
if ( !mLayer )
return;
mValueGroupBox->show();
int fieldIndex = mLayer->fieldNameIndex( item->text() );
fillFieldValues( fieldIndex, -1 );
}
void QgsExpressionBuilderWidget::setExpressionState( bool state )
{
mExpressionValid = state;
}
QString QgsExpressionBuilderWidget::loadFunctionHelp( QgsExpressionItem* functionName )
{
if ( functionName == NULL )
return "";
// set up the path to the help file
QString helpFilesPath = QgsApplication::pkgDataPath() + "/resources/function_help/";
/*
* determine the locale and create the file name from
* the context id
*/
QString lang = QLocale::system().name();
QSettings settings;
if ( settings.value( "locale/overrideFlag", false ).toBool() )
{
QLocale l( settings.value( "locale/userLocale", "en_US" ).toString() );
lang = l.name();
}
/*
* If the language isn't set on the system, assume en_US,
* otherwise we get the banner at the top of the help file
* saying it isn't available in "your" language. Some systems
* may be installed without the LANG environment being set.
*/
if ( lang.length() == 0 || lang == "C" )
{
lang = "en_US";
}
QString name = functionName->text();
if ( functionName->getItemType() == QgsExpressionItem::Field )
name = "Field";
QString fullHelpPath = helpFilesPath + name + "-" + lang;
// get the help content and title from the localized file
QString helpContents;
QFile file( fullHelpPath );
// check to see if the localized version exists
QString missingError = tr( "<h3>Oops! QGIS can't find help for this function.</h3>"
"The help file for %1 was not found for your language<br>"
"If you would like to create it, contact the QGIS development team"
).arg( name );
if ( !file.exists() )
{
// change the file name to the en_US version (default)
fullHelpPath = helpFilesPath + functionName->text() + "-en_US";
file.setFileName( fullHelpPath );
// Check for some sort of english locale and if not found, include
// translate this for us message
if ( !lang.contains( "en_" ) )
{
helpContents = missingError;
}
}
if ( !file.open( QIODevice::ReadOnly | QIODevice::Text ) )
{
helpContents = missingError;
}
else
{
QTextStream in( &file );
in.setCodec( "UTF-8" ); // Help files must be in Utf-8
while ( !in.atEnd() )
{
QString line = in.readLine();
helpContents += line;
}
}
file.close();
// Set the browser text to the help contents
QString myStyle = QgsApplication::reportStyleSheet();
helpContents = "<head><style>" + myStyle + "</style></head><body>" + helpContents + "</body>";
return helpContents;
}