Add a spinner icon to QgsFilterLineEdit

python/gui/qgsfilterlineedit.sip

@@ -10,7 +10,6 @@
 
 
 
-
 class QgsFilterLineEdit : QLineEdit
 {
 %Docstring
@@ -164,6 +163,23 @@ class QgsFilterLineEdit : QLineEdit
  :rtype: bool
 %End
 
+    bool showSpinner() const;
+%Docstring
+ Show a spinner icon. This can be used for search boxes to indicate that
+ something is going on in the background.
+
+.. versionadded:: 3.0
+ :rtype: bool
+%End
+
+    void setShowSpinner( bool showSpinner );
+%Docstring
+ Show a spinner icon. This can be used for search boxes to indicate that
+ something is going on in the background.
+
+.. versionadded:: 3.0
+%End
+
   public slots:
 
     virtual void clearValue();
@@ -188,6 +204,11 @@ class QgsFilterLineEdit : QLineEdit
  \param value The current text or null string if it matches the nullValue() property.
 %End
 
+    void showSpinnerChanged();
+%Docstring
+ \copydoc showSpinner
+%End
+
   protected:
     virtual void mousePressEvent( QMouseEvent *e );
 

src/gui/qgsfilterlineedit.cpp

@@ -17,11 +17,13 @@
 
 #include "qgsfilterlineedit.h"
 #include "qgsapplication.h"
+#include "qgsanimatedicon.h"
 
 #include <QToolButton>
 #include <QStyle>
 #include <QFocusEvent>
 #include <QPainter>
+#include <QDebug>
 
 QgsFilterLineEdit::QgsFilterLineEdit( QWidget *parent, const QString &nullValue )
   : QLineEdit( parent )
@@ -151,6 +153,13 @@ void QgsFilterLineEdit::paintEvent( QPaintEvent *e )
     QPainter p( this );
     p.drawPixmap( r.left(), r.top(), mSearchIconPixmap );
   }
+
+  if ( mShowSpinner )
+  {
+    QRect r = busySpinnerRect();
+    QPainter p( this );
+    p.drawPixmap( r.left(), r.top(), mBusySpinner->icon().pixmap( r.size() ) );
+  }
 }
 
 void QgsFilterLineEdit::leaveEvent( QEvent *e )
@@ -184,6 +193,38 @@ void QgsFilterLineEdit::onTextChanged( const QString &text )
   }
 }
 
+void QgsFilterLineEdit::updateBusySpinner()
+{
+  update();
+}
+
+bool QgsFilterLineEdit::showSpinner() const
+{
+  return mShowSpinner;
+}
+
+void QgsFilterLineEdit::setShowSpinner( bool showSpinner )
+{
+  if ( showSpinner == mShowSpinner )
+    return;
+
+  if ( showSpinner )
+  {
+    if ( !mBusySpinner )
+      mBusySpinner = new QgsAnimatedIcon( QgsApplication::iconPath( QStringLiteral( "/mIconLoading.gif" ) ), this );
+
+    mBusySpinner->connectFrameChanged( this, &QgsFilterLineEdit::updateBusySpinner );
+  }
+  else
+  {
+    mBusySpinner->disconnectFrameChanged( this, &QgsFilterLineEdit::updateBusySpinner );
+    update();
+  }
+
+  mShowSpinner = showSpinner;
+  emit showSpinnerChanged();
+}
+
 bool QgsFilterLineEdit::shouldShowClear() const
 {
   if ( !isEnabled() || isReadOnly() || !mClearButtonVisible )
@@ -209,6 +250,18 @@ QRect QgsFilterLineEdit::clearRect() const
                 mClearIconSize.height() );
 }
 
+QRect QgsFilterLineEdit::busySpinnerRect() const
+{
+  int frameWidth = style()->pixelMetric( QStyle::PM_DefaultFrameWidth );
+
+  int offset = shouldShowClear() ? mClearIconSize.width() + frameWidth * 2 : frameWidth;
+
+  return QRect( rect().right() - offset - mClearIconSize.width(),
+                ( rect().bottom() + 1 - mClearIconSize.height() ) / 2,
+                mClearIconSize.width(),
+                mClearIconSize.height() );
+}
+
 QRect QgsFilterLineEdit::searchRect() const
 {
   int frameWidth = style()->pixelMetric( QStyle::PM_DefaultFrameWidth );

src/gui/qgsfilterlineedit.h

@@ -23,7 +23,7 @@
 #include "qgis_gui.h"
 
 class QToolButton;
-
+class QgsAnimatedIcon;
 
 /**
  * \class QgsFilterLineEdit
@@ -54,6 +54,7 @@ class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
     Q_PROPERTY( QString value READ value WRITE setValue NOTIFY valueChanged )
     Q_PROPERTY( bool showClearButton READ showClearButton WRITE setShowClearButton )
     Q_PROPERTY( bool showSearchIcon READ showSearchIcon WRITE setShowSearchIcon )
+    Q_PROPERTY( bool showSpinner READ showSpinner WRITE setShowSpinner NOTIFY showSpinnerChanged )
 
   public:
 
@@ -182,6 +183,22 @@ class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
      */
     inline bool isNull() const { return text() == mNullValue; }
 
+    /**
+     * Show a spinner icon. This can be used for search boxes to indicate that
+     * something is going on in the background.
+     *
+     * \since QGIS 3.0
+     */
+    bool showSpinner() const;
+
+    /**
+     * Show a spinner icon. This can be used for search boxes to indicate that
+     * something is going on in the background.
+     *
+     * \since QGIS 3.0
+     */
+    void setShowSpinner( bool showSpinner );
+
   public slots:
 
     /**
@@ -206,6 +223,11 @@ class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
      */
     void valueChanged( const QString &value );
 
+    /**
+     * \copydoc showSpinner
+     */
+    void showSpinnerChanged();
+
   protected:
     void mousePressEvent( QMouseEvent *e ) override;
     void mouseMoveEvent( QMouseEvent *e ) override;
@@ -215,11 +237,13 @@ class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
 
   private slots:
     void onTextChanged( const QString &text );
+    void updateBusySpinner();
 
   private:
 
     bool mClearButtonVisible = true;
     bool mSearchIconVisible = false;
+    bool mShowSpinner = false;
 
     ClearMode mClearMode = ClearToNull;
 
@@ -235,12 +259,14 @@ class GUI_EXPORT QgsFilterLineEdit : public QLineEdit
 
     QSize mSearchIconSize;
     QPixmap mSearchIconPixmap;
+    QgsAnimatedIcon *mBusySpinner = nullptr;
 
     //! Returns true if clear button should be shown
     bool shouldShowClear() const;
 
     QRect clearRect() const;
     QRect searchRect() const;
+    QRect busySpinnerRect() const;
 };
 
 /// @cond PRIVATE