Use screen to grab instead of deprecated grabWidget

qgis · Nov 29, 2017 · 656de62 · 656de62
1 parent 3b933f5
commit 656de62
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Showing 4 changed files with 51 additions and 8 deletions.
diff --git a/src/gui/qgscolorbutton.cpp b/src/gui/qgscolorbutton.cpp
@@ -33,6 +33,7 @@
 #include <QStyle>
 #include <QStyleOptionToolButton>
 #include <QWidgetAction>
+#include <QScreen>
 #include <QLabel>
 #include <QGridLayout>
 #include <QPushButton>
@@ -245,10 +246,14 @@ void QgsColorButton::mouseMoveEvent( QMouseEvent *e )
     {
       //if left button depressed, sample color under cursor and temporarily update button color
       //to give feedback to user
-      QPixmap snappedPixmap = QPixmap::grabWindow( QApplication::desktop()->winId(), e->globalPos().x(), e->globalPos().y(), 1, 1 );
+      QScreen *screen = findScreenAt( e->globalPos() );
-      QImage snappedImage = snappedPixmap.toImage();
+      if ( screen )
-      QColor hoverColor = snappedImage.pixel( 0, 0 );
+      {
-      setButtonBackground( hoverColor );
+        QPixmap snappedPixmap = screen->grabWindow( QApplication::desktop()->winId(), e->globalPos().x(), e->globalPos().y(), 1, 1 );
+        QImage snappedImage = snappedPixmap.toImage();
+        QColor hoverColor = snappedImage.pixel( 0, 0 );
+        setButtonBackground( hoverColor );
+      }
     }
     e->accept();
     return;
@@ -297,6 +302,7 @@ void QgsColorButton::stopPicking( QPointF eventPos, bool sampleColor )
   releaseMouse();
   releaseKeyboard();
   unsetCursor();
+  setMouseTracking( false );
   mPickingColor = false;
 
   if ( !sampleColor )
@@ -306,7 +312,7 @@ void QgsColorButton::stopPicking( QPointF eventPos, bool sampleColor )
   }
 
   //grab snapshot of pixel under mouse cursor
-  QPixmap snappedPixmap = QPixmap::grabWindow( QApplication::desktop()->winId(), eventPos.x(), eventPos.y(), 1, 1 );
+  QPixmap snappedPixmap = QApplication::desktop()->screen()->grab( QRect( eventPos.x(), eventPos.y(), 1, 1 ) );
   QImage snappedImage = snappedPixmap.toImage();
   //extract color from pixel and set color
   setColor( snappedImage.pixel( 0, 0 ) );
@@ -360,6 +366,18 @@ void QgsColorButton::dropEvent( QDropEvent *e )
   }
 }
 
+QScreen *QgsColorButton::findScreenAt( const QPoint &pos )
+{
+  for ( QScreen *screen : QGuiApplication::screens() )
+  {
+    if ( screen->geometry().contains( pos ) )
+    {
+      return screen;
+    }
+  }
+  return nullptr;
+}
+
 void QgsColorButton::setValidColor( const QColor &newColor )
 {
   if ( newColor.isValid() )
@@ -671,11 +689,12 @@ void QgsColorButton::pasteColor()
 
 void QgsColorButton::activatePicker()
 {
-  //pick color
+  //activate picker color
   setCursor( QgsApplication::getThemeCursor( QgsApplication::Cursor::Sampler ) );
   grabMouse();
   grabKeyboard();
   mPickingColor = true;
+  setMouseTracking( true );
 }
 
 QColor QgsColorButton::color() const

diff --git a/src/gui/qgscolorbutton.h b/src/gui/qgscolorbutton.h
@@ -415,6 +415,7 @@ class GUI_EXPORT QgsColorButton : public QToolButton
 
   private:
 
+    static QScreen *findScreenAt( const QPoint &pos );
     Behavior mBehavior = QgsColorButton::ShowDialog;
     QString mColorDialogTitle;
     QColor mColor;

diff --git a/src/gui/qgscompoundcolorwidget.cpp b/src/gui/qgscompoundcolorwidget.cpp
@@ -27,6 +27,7 @@
 #include <QMessageBox>
 #include <QDesktopWidget>
 #include <QMouseEvent>
+#include <QScreen>
 #include <QInputDialog>
 #include <QVBoxLayout>
 
@@ -542,6 +543,18 @@ void QgsCompoundColorWidget::mActionShowInButtons_toggled( bool state )
   }
 }
 
+QScreen *QgsCompoundColorWidget::findScreenAt( const QPoint &pos )
+{
+  for ( QScreen *screen : QGuiApplication::screens() )
+  {
+    if ( screen->geometry().contains( pos ) )
+    {
+      return screen;
+    }
+  }
+  return nullptr;
+}
+
 void QgsCompoundColorWidget::saveSettings()
 {
   //save changes to scheme
@@ -694,8 +707,16 @@ QColor QgsCompoundColorWidget::averageColor( const QImage &image ) const
 QColor QgsCompoundColorWidget::sampleColor( QPoint point ) const
 {
   int sampleRadius = mSpinBoxRadius->value() - 1;
-  QPixmap snappedPixmap = QPixmap::grabWindow( QApplication::desktop()->winId(), point.x() - sampleRadius, point.y() - sampleRadius,
+  QScreen *screen = findScreenAt( point );
-                          1 + sampleRadius * 2, 1 + sampleRadius * 2 );
+  if ( ! screen )
+  {
+    return QColor();
+  }
+  QPixmap snappedPixmap = screen->grabWindow( QApplication::desktop()->winId(),
+                          point.x() - sampleRadius,
+                          point.y() - sampleRadius,
+                          1 + sampleRadius * 2,
+                          1 + sampleRadius * 2 );
   QImage snappedImage = snappedPixmap.toImage();
   //scan all pixels and take average color
   return averageColor( snappedImage );

diff --git a/src/gui/qgscompoundcolorwidget.h b/src/gui/qgscompoundcolorwidget.h
@@ -137,6 +137,8 @@ class GUI_EXPORT QgsCompoundColorWidget : public QgsPanelWidget, private Ui::Qgs
 
   private:
 
+    static QScreen *findScreenAt( const QPoint &pos );
+
     bool mAllowAlpha = true;
 
     int mLastCustomColorIndex = 0;