[quick] [feature] Feature attribute panel

Allow to show feature attribute form and edit/save the modification
of the attributes. Support most frequent QGIS edit widgets such
as text edit, value map or external resource (photo capture)

doc/qgsquick.dox

@@ -13,6 +13,9 @@ QGIS Quick consists of a Qt plugin that provides the QML components and of a sha
 
 \subsection qgsquick_overview_widgets QML Classes
 \subsubsection qgsquick_overview_widgets_mapcanvas MapCanvas
+\subsubsection qgsquick_overview_widgets_featureform FeatureForm
+A form listing attributes of a given feature. It supports basic edit field widgets for types such as edit text, map value,
+check box,  date/time picker or external resource (photo capture).
 \subsubsection qgsquick_overview_widgets_positionmarker PositionMarker
 The element refers to current position according gps location device connected to it. It holds information about longitude, latitude, altitude,
 direction of the movement and accuracy of the signal. See also QgsQuickPositionKit.

src/quickgui/CMakeLists.txt

@@ -1,6 +1,11 @@
 ############################################################
 # sources
 SET(QGIS_QUICK_GUI_MOC_HDRS
+  attributes/qgsquickattributeformmodel.h
+  attributes/qgsquickattributeformmodelbase.h
+  attributes/qgsquickattributemodel.h
+  attributes/qgsquicksubmodel.h
+
   qgsquickfeaturelayerpair.h
   qgsquickcoordinatetransformer.h
   qgsquickfeaturehighlight.h
@@ -20,6 +25,11 @@ SET(QGIS_QUICK_GUI_HDRS
 )
 
 SET(QGIS_QUICK_GUI_SRC
+  attributes/qgsquickattributeformmodel.cpp
+  attributes/qgsquickattributeformmodelbase.cpp
+  attributes/qgsquickattributemodel.cpp
+  attributes/qgsquicksubmodel.cpp
+
   qgsquickfeaturelayerpair.cpp
   qgsquickcoordinatetransformer.cpp
   qgsquickfeaturehighlight.cpp
@@ -37,6 +47,7 @@ SET(QGIS_QUICK_GUI_SRC
 
 INCLUDE_DIRECTORIES(
   ${CMAKE_CURRENT_SOURCE_DIR}
+  ${CMAKE_CURRENT_SOURCE_DIR}/attributes
   ${CMAKE_CURRENT_BINARY_DIR}
 
   ${CMAKE_SOURCE_DIR}/src/core

src/quickgui/attributes/qgsquickattributeformmodel.cpp

@@ -0,0 +1,72 @@
+/***************************************************************************
+ qgsquickattributeformmodel.cpp
+  --------------------------------------
+  Date                 : 22.9.2016
+  Copyright            : (C) 2016 by Matthias Kuhn
+  Email                : matthias@opengis.ch
+ ***************************************************************************
+ *                                                                         *
+ *   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 "qgsquickattributeformmodel.h"
+#include "qgsquickattributeformmodelbase.h"
+
+QgsQuickAttributeFormModel::QgsQuickAttributeFormModel( QObject *parent )
+  : QSortFilterProxyModel( parent )
+  , mSourceModel( new QgsQuickAttributeFormModelBase( this ) )
+{
+  setSourceModel( mSourceModel );
+  connect( mSourceModel, &QgsQuickAttributeFormModelBase::hasTabsChanged, this, &QgsQuickAttributeFormModel::hasTabsChanged );
+  connect( mSourceModel, &QgsQuickAttributeFormModelBase::attributeModelChanged, this, &QgsQuickAttributeFormModel::attributeModelChanged );
+  connect( mSourceModel, &QgsQuickAttributeFormModelBase::constraintsValidChanged, this, &QgsQuickAttributeFormModel::constraintsValidChanged );
+}
+
+bool QgsQuickAttributeFormModel::hasTabs() const
+{
+  return mSourceModel->hasTabs();
+}
+
+void QgsQuickAttributeFormModel::setHasTabs( bool hasTabs )
+{
+  mSourceModel->setHasTabs( hasTabs );
+}
+
+QgsQuickAttributeModel *QgsQuickAttributeFormModel::attributeModel() const
+{
+  return mSourceModel->attributeModel();
+}
+
+void QgsQuickAttributeFormModel::setAttributeModel( QgsQuickAttributeModel *attributeModel )
+{
+  mSourceModel->setAttributeModel( attributeModel );
+}
+
+bool QgsQuickAttributeFormModel::constraintsValid() const
+{
+  return mSourceModel->constraintsValid();
+}
+
+void QgsQuickAttributeFormModel::save()
+{
+  mSourceModel->save();
+}
+
+void QgsQuickAttributeFormModel::create()
+{
+  mSourceModel->create();
+}
+
+QVariant QgsQuickAttributeFormModel::attribute( const QString &name ) const
+{
+  return mSourceModel->attribute( name );
+}
+
+bool QgsQuickAttributeFormModel::filterAcceptsRow( int source_row, const QModelIndex &source_parent ) const
+{
+  return mSourceModel->data( mSourceModel->index( source_row, 0, source_parent ), CurrentlyVisible ).toBool();
+}

src/quickgui/attributes/qgsquickattributeformmodel.h

@@ -0,0 +1,122 @@
+/***************************************************************************
+ qgsquickattributeformmodel.h
+  --------------------------------------
+  Date                 : 22.9.2016
+  Copyright            : (C) 2016 by Matthias Kuhn
+  Email                : matthias@opengis.ch
+ ***************************************************************************
+ *                                                                         *
+ *   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 QGSQUICKATTRIBUTEFORMMODEL_H
+#define QGSQUICKATTRIBUTEFORMMODEL_H
+
+#include <QSortFilterProxyModel>
+
+#include "qgis_quick.h"
+
+class QgsQuickAttributeFormModelBase;
+class QgsQuickAttributeModel;
+class QVariant;
+
+/**
+ * \ingroup quick
+ * This is a model implementation for attribute form of a feature from a vector layer.
+ *
+ * The model is based on vector layer's edit form config (QgsEditFormConfig). It supports
+ * auto-generated editor layouts and "tab" layout (layout defined with groups and tabs).
+ * The form layout gets flattened into a list, each row has a bunch of roles with values
+ * extracted from the edit form config.
+ *
+ * It also adds filtering of attribute (attributes may be visible or hidden based on expressions).
+ *
+ * \note QML Type: AttributeFormModel
+ *
+ * \since QGIS 3.4
+ */
+class QUICK_EXPORT QgsQuickAttributeFormModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+
+    //! Feature model with attributes
+    Q_PROPERTY( QgsQuickAttributeModel *attributeModel READ attributeModel WRITE setAttributeModel NOTIFY attributeModelChanged )
+
+    //! Whether use tabs layout
+    Q_PROPERTY( bool hasTabs READ hasTabs WRITE setHasTabs NOTIFY hasTabsChanged )
+
+    //! Returns true if all constraints defined on fields are satisfied with the current attribute values
+    Q_PROPERTY( bool constraintsValid READ constraintsValid NOTIFY constraintsValidChanged )
+
+  public:
+
+    //! Feature fields's roles
+    enum FeatureRoles
+    {
+      ElementType = Qt::UserRole + 1, //!< User role used to identify either "field" or "container" type of item
+      Name, //!< Field Name
+      AttributeValue, //!< Field Value
+      AttributeEditable,  //!< Whether is field editable
+      EditorWidget, //!< Widget type to represent the data (text field, value map, ...)
+      EditorWidgetConfig, //!< Widget configuration
+      RememberValue, //!< Remember value (default value for next feature)
+      Field, //!< Field
+      FieldIndex, //!< Index
+      Group, //!< Group
+      AttributeEditorElement, //!< Attribute editor element
+      CurrentlyVisible, //!< Field visible
+      ConstraintValid, //!< Contraint valid
+      ConstraintDescription //!< Contraint description
+    };
+
+    Q_ENUM( FeatureRoles )
+
+    //! Create new attribute form model
+    QgsQuickAttributeFormModel( QObject *parent = nullptr );
+
+    //! \copydoc QgsQuickAttributeFormModel::hasTabs
+    bool hasTabs() const;
+
+    //! \copydoc QgsQuickAttributeFormModel::hasTabs
+    void setHasTabs( bool hasTabs );
+
+    //! \copydoc QgsQuickAttributeFormModel::attributeModel
+    QgsQuickAttributeModel *attributeModel() const;
+
+    //! \copydoc QgsQuickAttributeFormModel::attributeModel
+    void setAttributeModel( QgsQuickAttributeModel *attributeModel );
+
+    //! \copydoc QgsQuickAttributeFormModel::constraintsValid
+    bool constraintsValid() const;
+
+    //! Updates QgsFeature based on changes
+    Q_INVOKABLE void save();
+
+    //! Creates new QgsFeature
+    Q_INVOKABLE void create();
+
+    //! Returns attribute value with name
+    Q_INVOKABLE QVariant attribute( const QString &name ) const;
+
+  signals:
+    //! \copydoc QgsQuickAttributeFormModel::attributeModel
+    void attributeModelChanged();
+
+    //! \copydoc QgsQuickAttributeFormModel::hasTabs
+    void hasTabsChanged();
+
+    //! \copydoc QgsQuickAttributeFormModel::constraintsValid
+    void constraintsValidChanged();
+
+  protected:
+    virtual bool filterAcceptsRow( int source_row, const QModelIndex &source_parent ) const override;
+
+  private:
+    QgsQuickAttributeFormModelBase *mSourceModel; //not owned
+};
+
+#endif // QGSQUICKATTRIBUTEFORMMODEL_H