[FEATURE] add lineedit with builtin clear button

images/images.qrc

@@ -172,6 +172,7 @@
     <file>themes/default/mIconClose.png</file>
     <file>themes/default/mIconCollapse.png</file>
     <file>themes/default/mIconConnect.png</file>
+        <file>themes/default/mIconClear.png</file>
     <file>themes/default/mIconDbSchema.png</file>
     <file>themes/default/mIconDelete.png</file>
     <file>themes/default/mIconEditable.png</file>

python/gui/gui.sip

@@ -23,6 +23,7 @@
 %Include qgsexpressionhighlighter.sip
 %Include qgsfieldvalidator.sip
 %Include qgsfiledropedit.sip
+%Include qgsfilterlineedit.sip
 %Include qgsformannotationitem.sip
 %Include qgsgenericprojectionselector.sip
 %Include qgshtmlannotationitem.sip

python/gui/qgsfilterlineedit.sip

@@ -0,0 +1,15 @@
+
+/** LineEdit with builtin clear button
+ */
+class QgsFilterLineEdit : QLineEdit
+{
+%TypeHeaderCode
+#include <qgsfilterlineedit.h>
+%End
+
+  public:
+    QgsFilterLineEdit( QWidget* parent = 0 );
+
+  protected:
+    void resizeEvent( QResizeEvent * );
+};

src/gui/CMakeLists.txt

@@ -98,6 +98,7 @@ qgsexpressionbuilderdialog.cpp
 qgsexpressionhighlighter.cpp
 qgsquerybuilder.cpp
 qgscollapsiblegroupbox.cpp
+qgsfilterlineedit.cpp
 )
 
 IF (WITH_TOUCH)
@@ -186,6 +187,7 @@ qgsexpressionbuilderwidget.h
 qgsexpressionhighlighter.h
 qgsquerybuilder.h
 qgscollapsiblegroupbox.h
+qgsfilterlineedit.h
 )
 
 QT4_WRAP_CPP(QGIS_GUI_MOC_SRCS ${QGIS_GUI_MOC_HDRS})
@@ -225,6 +227,7 @@ qgsexpressionbuilderwidget.h
 qgsexpressionbuilderdialog.h
 qgsexpressionhighlighter.h
 qgscollapsiblegroupbox.h
+qgsfilterlineedit.h
 
 attributetable/qgsattributetablemodel.h
 attributetable/qgsattributetablememorymodel.h

src/gui/qgsfilterlineedit.cpp

@@ -0,0 +1,56 @@
+/***************************************************************************
+                              qgsfilterlineedit.cpp
+                              ------------------------
+  begin                : October 27, 2012
+  copyright            : (C) 2012 by Alexander Bruy
+  email                : alexander dot bruy 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 "qgsfilterlineedit.h"
+#include "qgsapplication.h"
+
+#include <QToolButton>
+#include <QStyle>
+
+QgsFilterLineEdit::QgsFilterLineEdit( QWidget* parent ) : QLineEdit( parent )
+{
+  btnClear = new QToolButton( this );
+  btnClear->setIcon( QgsApplication::getThemeIcon( "/mIconClear.png" ) );
+  btnClear->setCursor(Qt::ArrowCursor);
+  btnClear->setStyleSheet( "QToolButton { border: none; padding: 0px; }" );
+  btnClear->hide();
+
+  connect( btnClear, SIGNAL( clicked() ), this, SLOT( clear() ) );
+  connect( this, SIGNAL( textChanged( const QString& ) ), this,
+           SLOT( toggleClearButton( const QString& ) ) );
+
+  int frameWidth = style()->pixelMetric( QStyle::PM_DefaultFrameWidth );
+  setStyleSheet( QString( "QLineEdit { padding-right: %1px; } " )
+               .arg( btnClear->sizeHint().width() + frameWidth + 1 ) );
+
+  QSize msz = minimumSizeHint();
+  setMinimumSize( qMax( msz.width(), btnClear->sizeHint().height() + frameWidth * 2 + 2 ),
+                  qMax( msz.height(), btnClear->sizeHint().height() + frameWidth * 2 + 2 ) );
+}
+
+void QgsFilterLineEdit::resizeEvent( QResizeEvent * )
+{
+  QSize sz = btnClear->sizeHint();
+  int frameWidth = style()->pixelMetric( QStyle::PM_DefaultFrameWidth );
+  btnClear->move( rect().right() - frameWidth - sz.width(),
+                  ( rect().bottom() + 1 - sz.height() ) / 2 );
+}
+
+void QgsFilterLineEdit::toggleClearButton( const QString &text )
+{
+  btnClear->setVisible( !text.isEmpty() );
+}

src/gui/qgsfilterlineedit.h

@@ -0,0 +1,44 @@
+/***************************************************************************
+                              qgsfilterlineedit.h
+                              ------------------------
+  begin                : October 27, 2012
+  copyright            : (C) 2012 by Alexander Bruy
+  email                : alexander dot bruy 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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSFILTERLINEEDIT_H
+#define QGSFILTERLINEEDIT_H
+
+#include <QLineEdit>
+
+class QToolButton;
+
+/** \ingroup gui
+ * Lineedit with builtin clear button
+ **/
+class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
+{
+    Q_OBJECT
+  public:
+    QgsFilterLineEdit( QWidget* parent = 0 );
+
+  protected:
+    void resizeEvent( QResizeEvent * );
+
+  private slots:
+    void toggleClearButton( const QString &text );
+
+  private:
+    QToolButton *btnClear;
+};
+
+#endif // QGSFILTERLINEEDIT_H