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qgsfilterlineedit.h
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1 /***************************************************************************
2  qgsfilterlineedit.h
3  ------------------------
4  begin : October 27, 2012
5  copyright : (C) 2012 by Alexander Bruy
6  email : alexander dot bruy 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 
18 #ifndef QGSFILTERLINEEDIT_H
19 #define QGSFILTERLINEEDIT_H
20 
21 #include <QLineEdit>
22 
23 class QToolButton;
24 
28 class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
29 {
30  Q_OBJECT
31  Q_PROPERTY( QString nullValue READ nullValue WRITE setNullValue )
32 
33  public:
34  QgsFilterLineEdit( QWidget* parent = 0, QString nullValue = QString::null );
35 
36  void setNullValue( QString nullValue ) { mNullValue = nullValue; }
37 
38  QString nullValue() const { return mNullValue; }
39 
45  void setValue( QString value ) { setText( value.isNull() ? mNullValue : value ); }
46 
52  QString value() const { return isNull() ? QString::null : text(); }
53 
59  inline bool isNull() const { return text() == mNullValue; }
60 
61  signals:
62  void cleared();
63 
69  void valueChanged( const QString& value );
70 
71  protected:
72  void mousePressEvent( QMouseEvent* e );
73  void focusInEvent( QFocusEvent* e );
74  void resizeEvent( QResizeEvent* e );
75  void changeEvent( QEvent* e );
76  void paintEvent( QPaintEvent* e );
77 
78  private slots:
79  void clear();
80  void onTextChanged( const QString &text );
81 
82  private:
83  QString mNullValue;
84  QToolButton *btnClear;
85  QString mStyleSheet;
86  bool mFocusInEvent;
87 };
88 
89 #endif // QGSFILTERLINEEDIT_H
QString nullValue() const
Definition: qgsfilterlineedit.h:38
QString value() const
Returns the text of this edit with NULL support.
Definition: qgsfilterlineedit.h:52
Lineedit with builtin clear button.
Definition: qgsfilterlineedit.h:28
void setNullValue(QString nullValue)
Definition: qgsfilterlineedit.h:36
void setValue(QString value)
Sets the current text with NULL support.
Definition: qgsfilterlineedit.h:45
bool isNull() const
Determine if the current text represents Null.
Definition: qgsfilterlineedit.h:59
bool isNull(const QVariant &v)
Definition: qgsexpression.cpp:196