A different approach to avoiding accidently scroll changes

python/console/console_settings.ui

@@ -46,7 +46,7 @@
     </widget>
    </item>
    <item row="0" column="0">
-    <widget class="QScrollArea" name="scrollArea">
+    <widget class="QgsScrollArea" name="scrollArea">
      <property name="frameShape">
       <enum>QFrame::NoFrame</enum>
      </property>
@@ -1139,6 +1139,12 @@
   </layout>
  </widget>
  <customwidgets>
+  <customwidget>
+   <class>QgsScrollArea</class>
+   <extends>QScrollArea</extends>
+   <header location="global">qgis.gui</header>
+   <container>1</container>
+  </customwidget>
   <customwidget>
    <class>QgsCollapsibleGroupBox</class>
    <extends>QGroupBox</extends>

python/gui/gui.sip

@@ -154,6 +154,7 @@
 %Include qgsscalerangewidget.sip
 %Include qgsscalevisibilitydialog.sip
 %Include qgsscalewidget.sip
+%Include qgsscrollarea.sip
 %Include qgssearchquerybuilder.sip
 %Include qgsshortcutsmanager.sip
 %Include qgsslider.sip

python/gui/qgsscrollarea.sip

@@ -0,0 +1,15 @@
+class QgsScrollArea : QScrollArea
+{
+%TypeHeaderCode
+#include <qgsscrollarea.h>
+%End
+
+  public:
+    explicit QgsScrollArea( QWidget *parent /TransferThis/ = 0 );
+    void scrollOccurred();
+    bool hasScrolled() const;
+
+  protected:
+    void wheelEvent( QWheelEvent *event );
+
+};

python/plugins/processing/modeler/ModelerParametersDialog.py

@@ -30,13 +30,14 @@
 from qgis.PyQt.QtCore import Qt, QUrl, QMetaObject
 from qgis.PyQt.QtWidgets import (QDialog, QDialogButtonBox, QLabel, QLineEdit,
                                  QFrame, QPushButton, QSizePolicy, QVBoxLayout,
-                                 QHBoxLayout, QTabWidget, QWidget, QScrollArea,
+                                 QHBoxLayout, QTabWidget, QWidget,
                                  QTextBrowser)
 from qgis.PyQt.QtNetwork import QNetworkRequest, QNetworkReply
 
 from qgis.core import QgsNetworkAccessManager
 
-from qgis.gui import QgsMessageBar
+from qgis.gui import (QgsMessageBar,
+                      QgsScrollArea)
 
 from processing.gui.wrappers import InvalidParameterValue
 from processing.gui.MultipleInputPanel import MultipleInputPanel
@@ -187,7 +188,7 @@ def setupUi(self):
         self.tabWidget.setMinimumWidth(300)
         self.paramPanel = QWidget()
         self.paramPanel.setLayout(self.verticalLayout)
-        self.scrollArea = QScrollArea()
+        self.scrollArea = QgsScrollArea()
         self.scrollArea.setWidget(self.paramPanel)
         self.scrollArea.setWidgetResizable(True)
         self.tabWidget.addTab(self.scrollArea, self.tr('Parameters'))

python/plugins/processing/ui/DlgModeler.ui

@@ -44,7 +44,7 @@
      <number>0</number>
     </property>
     <item>
-     <widget class="QScrollArea" name="scrollArea_1">
+     <widget class="QgsScrollArea" name="scrollArea_1">
       <property name="sizePolicy">
        <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
         <horstretch>0</horstretch>
@@ -138,7 +138,7 @@
      <number>0</number>
     </property>
     <item>
-     <widget class="QScrollArea" name="scrollArea_2">
+     <widget class="QgsScrollArea" name="scrollArea_2">
       <property name="sizePolicy">
        <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
         <horstretch>0</horstretch>
@@ -222,7 +222,7 @@
      <number>2</number>
     </property>
     <item>
-     <widget class="QScrollArea" name="scrollArea_3">
+     <widget class="QgsScrollArea" name="scrollArea_3">
       <property name="sizePolicy">
        <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
         <horstretch>0</horstretch>
@@ -505,6 +505,11 @@
   </action>
  </widget>
  <customwidgets>
+  <customwidget>
+   <class>QgsScrollArea</class>
+   <extends>QScrollArea</extends>
+   <header>qgis.gui</header>
+  </customwidget>
   <customwidget>
    <class>QgsFilterLineEdit</class>
    <extends>QLineEdit</extends>

python/plugins/processing/ui/widgetParametersPanel.ui

@@ -21,7 +21,7 @@
     <number>0</number>
    </property>
    <item>
-    <widget class="QScrollArea" name="scrollArea">
+    <widget class="QgsScrollArea" name="scrollArea">
      <property name="frameShape">
       <enum>QFrame::NoFrame</enum>
      </property>
@@ -88,6 +88,12 @@
   </layout>
  </widget>
  <customwidgets>
+  <customwidget>
+   <class>QgsScrollArea</class>
+   <extends>QScrollArea</extends>
+   <header>qgis.gui</header>
+   <container>1</container>
+  </customwidget>
   <customwidget>
    <class>QgsCollapsibleGroupBox</class>
    <extends>QGroupBox</extends>

src/app/composer/qgsattributeselectiondialog.cpp

@@ -29,7 +29,6 @@
 #include <QLabel>
 #include <QLineEdit>
 #include <QPushButton>
-#include <QScrollArea>
 #include <QSpinBox>
 #include <QSortFilterProxyModel>
 

src/customwidgets/CMakeLists.txt

@@ -32,6 +32,7 @@ SET (QGIS_CUSTOMWIDGETS_SRCS
   qgsrelationreferencewidgetplugin.cpp
   qgsscalerangewidgetplugin.cpp
   qgsscalewidgetplugin.cpp
+  qgsscrollareawidgetplugin.cpp
   qgsspinboxplugin.cpp
 )
 
@@ -57,6 +58,7 @@ SET (QGIS_CUSTOMWIDGETS_MOC_HDRS
   qgsrelationreferencewidgetplugin.h
   qgsscalerangewidgetplugin.h
   qgsscalewidgetplugin.h
+  qgsscrollareawidgetplugin.h
   qgsspinboxplugin.h
 )
 

src/customwidgets/qgsscrollareawidgetplugin.cpp

@@ -0,0 +1,95 @@
+/***************************************************************************
+   qgsscrollareawidgetplugin.cpp
+    --------------------------------------
+   Date                 : March 2017
+   Copyright            : (C) 2017 Nyall Dawson
+   Email                : nyall dot dawson 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 "qgiscustomwidgets.h"
+#include "qgsscrollareawidgetplugin.h"
+#include "qgsscrollarea.h"
+
+
+QgsScrollAreaWidgetPlugin::QgsScrollAreaWidgetPlugin( QObject *parent )
+  : QObject( parent )
+{}
+
+QString QgsScrollAreaWidgetPlugin::name() const
+{
+  return "QgsScrollArea";
+}
+
+QString QgsScrollAreaWidgetPlugin::group() const
+{
+  return QgisCustomWidgets::groupName();
+}
+
+QString QgsScrollAreaWidgetPlugin::includeFile() const
+{
+  return "qgsscrollarea.h";
+}
+
+QIcon QgsScrollAreaWidgetPlugin::icon() const
+{
+  return QIcon( ":/images/icons/qgis-icon-60x60.png" );
+}
+
+bool QgsScrollAreaWidgetPlugin::isContainer() const
+{
+  return true;
+}
+
+QWidget *QgsScrollAreaWidgetPlugin::createWidget( QWidget *parent )
+{
+  return new QgsScrollArea( parent );
+}
+
+bool QgsScrollAreaWidgetPlugin::isInitialized() const
+{
+  return mInitialized;
+}
+
+void QgsScrollAreaWidgetPlugin::initialize( QDesignerFormEditorInterface *core )
+{
+  Q_UNUSED( core );
+  if ( mInitialized )
+    return;
+  mInitialized = true;
+}
+
+
+QString QgsScrollAreaWidgetPlugin::toolTip() const
+{
+  return tr( "Scroll area" );
+}
+
+QString QgsScrollAreaWidgetPlugin::whatsThis() const
+{
+  return "";
+}
+
+QString QgsScrollAreaWidgetPlugin::domXml() const
+{
+  return QString( "<ui language=\"c++\">\n"
+                  " <widget class=\"%1\" name=\"mScrollArea\">\n"
+                  "  <property name=\"geometry\">\n"
+                  "   <rect>\n"
+                  "    <x>0</x>\n"
+                  "    <y>0</y>\n"
+                  "    <width>300</width>\n"
+                  "    <height>100</height>\n"
+                  "   </rect>\n"
+                  "  </property>\n"
+                  " </widget>\n"
+                  "</ui>\n" )
+         .arg( name() );
+}

src/customwidgets/qgsscrollareawidgetplugin.h

@@ -0,0 +1,50 @@
+/***************************************************************************
+   qgsscrollareawidgetplugin.h
+    --------------------------------------
+   Date                 : March 2017
+   Copyright            : (C) 2017 Nyall Dawson
+   Email                : nyall dot dawson 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 QGSSCROLLAREAWIDGETPLUGIN_H
+#define QGSSCROLLAREAWIDGETPLUGIN_H
+
+
+#include <QtGlobal>
+#include <QtUiPlugin/QDesignerCustomWidgetInterface>
+#include <QtUiPlugin/QDesignerExportWidget>
+#include "qgis_customwidgets.h"
+
+class CUSTOMWIDGETS_EXPORT QgsScrollAreaWidgetPlugin : public QObject, public QDesignerCustomWidgetInterface
+{
+    Q_OBJECT
+    Q_INTERFACES( QDesignerCustomWidgetInterface )
+
+  public:
+    explicit QgsScrollAreaWidgetPlugin( QObject *parent = 0 );
+
+  private:
+    bool mInitialized = false;
+
+    // QDesignerCustomWidgetInterface interface
+  public:
+    QString name() const override;
+    QString group() const override;
+    QString includeFile() const override;
+    QIcon icon() const override;
+    bool isContainer() const override;
+    QWidget *createWidget( QWidget *parent ) override;
+    bool isInitialized() const override;
+    void initialize( QDesignerFormEditorInterface *core ) override;
+    QString toolTip() const override;
+    QString whatsThis() const override;
+    QString domXml() const override;
+};
+#endif // QGSSCROLLAREAWIDGETPLUGIN_H

src/gui/CMakeLists.txt

@@ -296,6 +296,7 @@ SET(QGIS_GUI_SRCS
   qgsscalerangewidget.cpp
   qgsscalevisibilitydialog.cpp
   qgsscalewidget.cpp
+  qgsscrollarea.cpp
   qgssearchquerybuilder.cpp
   qgsshortcutsmanager.cpp
   qgsslider.cpp
@@ -442,6 +443,7 @@ SET(QGIS_GUI_MOC_HDRS
   qgsscalerangewidget.h
   qgsscalevisibilitydialog.h
   qgsscalewidget.h
+  qgsscrollarea.h
   qgssearchquerybuilder.h
   qgsshortcutsmanager.h
   qgsslider.h

src/gui/attributetable/qgsdualview.cpp

@@ -28,6 +28,7 @@
 #include "qgsorganizetablecolumnsdialog.h"
 #include "qgseditorwidgetregistry.h"
 #include "qgssettings.h"
+#include "qgsscrollarea.h"
 
 #include <QClipboard>
 #include <QDialog>
@@ -95,7 +96,7 @@ void QgsDualView::init( QgsVectorLayer *layer, QgsMapCanvas *mapCanvas, const Qg
   mAttributeForm = new QgsAttributeForm( mLayer, QgsFeature(), mEditorContext );
   if ( !context.parentContext() )
   {
-    mAttributeEditorScrollArea = new QScrollArea();
+    mAttributeEditorScrollArea = new QgsScrollArea();
     mAttributeEditorScrollArea->setWidgetResizable( true );
     mAttributeEditor->layout()->addWidget( mAttributeEditorScrollArea );
     mAttributeEditorScrollArea->setWidget( mAttributeForm );

src/gui/attributetable/qgsdualview.h

@@ -29,7 +29,7 @@
 class QgsFeatureRequest;
 class QSignalMapper;
 class QgsMapLayerAction;
-class QScrollArea;
+class QgsScrollArea;
 
 /** \ingroup gui
  * This widget is used to show the attributes of a set of features of a {@link QgsVectorLayer}.
@@ -351,7 +351,7 @@ class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBas
     QgsDistanceArea mDistanceArea;
     QString mDisplayExpression;
     QgsAttributeTableConfig mConfig;
-    QScrollArea *mAttributeEditorScrollArea = nullptr;
+    QgsScrollArea *mAttributeEditorScrollArea = nullptr;
     QgsMapCanvas *mMapCanvas = nullptr;
 
     friend class TestQgsDualView;

src/gui/qgsattributeform.cpp

@@ -31,6 +31,7 @@
 #include "qgslogger.h"
 #include "qgstabwidget.h"
 #include "qgssettings.h"
+#include "qgsscrollarea.h"
 
 #include <QDir>
 #include <QTextStream>
@@ -42,7 +43,6 @@
 #include <QKeyEvent>
 #include <QLabel>
 #include <QPushButton>
-#include <QScrollArea>
 #include <QUiLoader>
 #include <QMessageBox>
 #include <QToolButton>
@@ -1210,7 +1210,7 @@ void QgsAttributeForm::init()
     if ( mContext.formMode() != QgsAttributeEditorContext::Embed )
     {
       // put the form into a scroll area to nicely handle cases with lots of attributes
-      QScrollArea *scrollArea = new QScrollArea( this );
+      QgsScrollArea *scrollArea = new QgsScrollArea( this );
       scrollArea->setWidget( formWidget );
       scrollArea->setWidgetResizable( true );
       scrollArea->setFrameShape( QFrame::NoFrame );
@@ -1599,7 +1599,7 @@ QgsAttributeForm::WidgetInfo QgsAttributeForm::createWidgetFromDef( const QgsAtt
 
         if ( context.formMode() != QgsAttributeEditorContext::Embed )
         {
-          QScrollArea *scrollArea = new QScrollArea( parent );
+          QgsScrollArea *scrollArea = new QgsScrollArea( parent );
 
           scrollArea->setWidget( myContainer );
           scrollArea->setWidgetResizable( true );

src/gui/qgsattributetypeloaddialog.cpp

@@ -29,7 +29,6 @@
 #include <QComboBox>
 #include <QLabel>
 #include <QFrame>
-#include <QScrollArea>
 #include <QCompleter>
 #include <QSpinBox>
 #include <QPushButton>