QGIS API Documentation
3.0.2-Girona (307d082)
src
gui
qgsexpressionlineedit.h
Go to the documentation of this file.
1
/***************************************************************************
2
qgsexpressionlineedit.h
3
----------------------
4
Date : 18.08.2016
5
Copyright : (C) 2016 Nyall Dawson
6
Email : nyall dot dawson at gmail dot com
7
***************************************************************************
8
* *
9
* This program is free software; you can redistribute it and/or modify *
10
* it under the terms of the GNU General Public License as published by *
11
* the Free Software Foundation; either version 2 of the License, or *
12
* (at your option) any later version. *
13
* *
14
***************************************************************************/
15
16
#ifndef QGSEXPRESSIONLINEEDIT_H
17
#define QGSEXPRESSIONLINEEDIT_H
18
19
#include <QWidget>
20
#include "
qgis.h
"
21
#include "
qgsexpressioncontext.h
"
22
#include "
qgsdistancearea.h
"
23
#include "qgis_gui.h"
24
#include <memory>
25
26
class
QgsFilterLineEdit
;
27
class
QToolButton;
28
class
QgsDistanceArea
;
29
class
QgsExpressionContextGenerator
;
30
class
QgsCodeEditorSQL
;
31
49
class
GUI_EXPORT
QgsExpressionLineEdit
:
public
QWidget
50
{
51
Q_OBJECT
52
53
public
:
54
59
explicit
QgsExpressionLineEdit
( QWidget *parent
SIP_TRANSFERTHIS
=
nullptr
);
60
66
void
setExpressionDialogTitle(
const
QString &title );
67
72
QString
expressionDialogTitle
()
const
{
return
mExpressionDialogTitle; }
73
79
void
setMultiLine(
bool
multiLine );
80
85
void
setGeomCalculator(
const
QgsDistanceArea
&distanceArea );
86
95
void
setLayer(
QgsVectorLayer
*layer );
96
101
QString expression()
const
;
102
107
bool
isValidExpression( QString *expressionError
SIP_OUT
=
nullptr
)
const
;
108
115
void
registerExpressionContextGenerator(
const
QgsExpressionContextGenerator
*generator );
116
117
signals:
118
123
void
expressionChanged(
const
QString &expression );
124
125
public
slots:
126
132
void
setExpression(
const
QString &expression );
133
134
protected
:
135
136
void
changeEvent( QEvent *event )
override
;
137
138
private
slots:
139
141
void
expressionEdited(
const
QString &expression );
142
void
expressionEdited();
143
145
void
editExpression();
146
152
void
updateLineEditStyle(
const
QString &expression = QString() );
153
154
private
:
155
QgsFilterLineEdit
*mLineEdit =
nullptr
;
156
QgsCodeEditorSQL
*mCodeEditor =
nullptr
;
157
QToolButton *mButton =
nullptr
;
158
QString mExpressionDialogTitle;
159
std::unique_ptr<QgsDistanceArea> mDa;
160
QgsExpressionContext
mExpressionContext;
161
const
QgsExpressionContextGenerator
*mExpressionContextGenerator =
nullptr
;
162
QgsVectorLayer
*mLayer =
nullptr
;
163
164
bool
isExpressionValid(
const
QString &expressionStr );
165
166
friend
class
TestQgsFieldExpressionWidget;
167
};
168
169
#endif // QGSEXPRESSIONLINEEDIT_H
SIP_TRANSFERTHIS
#define SIP_TRANSFERTHIS
Definition:
qgis_sip.h:46
QgsExpressionLineEdit::expressionDialogTitle
QString expressionDialogTitle() const
Returns the title used for the expression dialog.
Definition:
qgsexpressionlineedit.h:72
qgsexpressioncontext.h
QgsExpressionContext
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Definition:
qgsexpressioncontext.h:375
QgsFilterLineEdit
QLineEdit subclass with built in support for clearing the widget's value and handling custom null val...
Definition:
qgsfilterlineedit.h:39
QgsExpressionContextGenerator
Abstract interface for generating an expression context.
Definition:
qgsexpressioncontextgenerator.h:36
QgsDistanceArea
A general purpose distance and area calculator, capable of performing ellipsoid based calculations...
Definition:
qgsdistancearea.h:49
qgsdistancearea.h
QgsCodeEditorSQL
A SQL editor based on QScintilla2.
Definition:
qgscodeeditorsql.h:33
QgsExpressionLineEdit
The QgsExpressionLineEdit widget includes a line edit for entering expressions together with a button...
Definition:
qgsexpressionlineedit.h:49
SIP_OUT
#define SIP_OUT
Definition:
qgis_sip.h:51
qgis.h
QgsVectorLayer
Represents a vector layer which manages a vector based data sets.
Definition:
qgsvectorlayer.h:353
Generated on Sat Apr 21 2018 11:45:00 for QGIS API Documentation by
1.8.13