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[bugfix] Do not crash when layer is destroyed while loading

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Fixes #17636 QGIS crashes when a layer is removed
while loading the attribute table
This commit is contained in:
Alessandro Pasotti 2017-12-09 16:07:02 +01:00
parent 53ebe050bd
commit e479b71594
5 changed files with 85 additions and 48 deletions
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6
python/gui/attributetable/qgsdualview.sip
View File

@ -208,6 +208,12 @@ class QgsDualView : QStackedWidget
%Docstring
Copy the content of the selected cell in the clipboard.
.. versionadded:: 1.16
%End
void cancelProgress( );
%Docstring
Cancel the progress dialog (if any)
.. versionadded:: 3.0
%End
signals:

20
src/app/qgsattributetabledialog.cpp
View File

@ -69,7 +69,7 @@ QgsExpressionContext QgsAttributeTableDialog::createExpressionContext() const
void QgsAttributeTableDialog::updateMultiEditButtonState()
{
if ( mLayer->editFormConfig().layout() == QgsEditFormConfig::UiFileLayout )
if ( ! mLayer || ( mLayer->editFormConfig().layout() == QgsEditFormConfig::UiFileLayout ) )
return;
mActionToggleMultiEdit->setEnabled( mLayer->isEditable() );
@ -199,7 +199,7 @@ QgsAttributeTableDialog::QgsAttributeTableDialog( QgsVectorLayer *layer, QgsAttr
// info from layer to table
connect( mLayer, &QgsVectorLayer::editingStarted, this, &QgsAttributeTableDialog::editingToggled );
connect( mLayer, &QgsVectorLayer::editingStopped, this, &QgsAttributeTableDialog::editingToggled );
connect( mLayer, &QObject::destroyed, this, &QWidget::close );
connect( mLayer, &QObject::destroyed, mMainView, &QgsDualView::cancelProgress );
connect( mLayer, &QgsVectorLayer::selectionChanged, this, &QgsAttributeTableDialog::updateTitle );
connect( mLayer, &QgsVectorLayer::featureAdded, this, &QgsAttributeTableDialog::updateTitle );
connect( mLayer, &QgsVectorLayer::featuresDeleted, this, &QgsAttributeTableDialog::updateTitle );
@ -292,6 +292,9 @@ QgsAttributeTableDialog::QgsAttributeTableDialog( QgsVectorLayer *layer, QgsAttr
break;
}
// Layer might have been destroyed while loading!
if ( mLayer )
{
mUpdateExpressionText->registerExpressionContextGenerator( this );
mFieldCombo->setFilters( QgsFieldProxyModel::AllTypes | QgsFieldProxyModel::HideReadOnly );
mFieldCombo->setLayer( mLayer );
@ -299,7 +302,7 @@ QgsAttributeTableDialog::QgsAttributeTableDialog( QgsVectorLayer *layer, QgsAttr
connect( mRunFieldCalc, &QAbstractButton::clicked, this, &QgsAttributeTableDialog::updateFieldFromExpression );
connect( mRunFieldCalcSelected, &QAbstractButton::clicked, this, &QgsAttributeTableDialog::updateFieldFromExpressionSelected );
// NW TODO Fix in 2.6 - Doesn't work with field model for some reason.
// connect( mUpdateExpressionText, SIGNAL( returnPressed() ), this, SLOT( updateFieldFromExpression() ) );
// connect( mUpdateExpressionText, SIGNAL( returnPressed() ), this, SLOT( updateFieldFromExpression() ) );
connect( mUpdateExpressionText, static_cast < void ( QgsFieldExpressionWidget::* )( const QString &, bool ) > ( &QgsFieldExpressionWidget::fieldChanged ), this, &QgsAttributeTableDialog::updateButtonStatus );
mUpdateExpressionText->setLayer( mLayer );
mUpdateExpressionText->setLeftHandButtonStyle( true );
@ -345,6 +348,13 @@ QgsAttributeTableDialog::QgsAttributeTableDialog( QgsVectorLayer *layer, QgsAttr
}
editingToggled();
// Close and delete if the layer has been destroyed
connect( mLayer, &QObject::destroyed, this, &QWidget::close );
}
else
{
QWidget::close();
}
}
QgsAttributeTableDialog::~QgsAttributeTableDialog()
@ -354,6 +364,10 @@ QgsAttributeTableDialog::~QgsAttributeTableDialog()
void QgsAttributeTableDialog::updateTitle()
{
if ( ! mLayer )
{
return;
}
QWidget *w = mDock ? qobject_cast<QWidget *>( mDock ) : qobject_cast<QWidget *>( this );
w->setWindowTitle( tr( " %1 :: Features Total: %2, Filtered: %3, Selected: %4" )
.arg( mLayer->name() )

2
src/app/qgsattributetabledialog.h
View File

@ -230,7 +230,7 @@ class APP_EXPORT QgsAttributeTableDialog : public QDialog, private Ui::QgsAttrib
QMenu *mFilterColumnsMenu = nullptr;
QSignalMapper *mFilterActionMapper = nullptr;
QgsVectorLayer *mLayer = nullptr;
QPointer< QgsVectorLayer > mLayer = nullptr;
QgsSearchWidgetWrapper *mCurrentSearchWidgetWrapper = nullptr;
QStringList mVisibleFields;
QgsAttributeEditorContext mEditorContext;

11
src/gui/attributetable/qgsdualview.cpp
View File

@ -318,6 +318,10 @@ void QgsDualView::restoreRecentDisplayExpressions()
void QgsDualView::saveRecentDisplayExpressions() const
{
if ( ! mLayer )
{
return;
}
QList<QAction *> actions = mFeatureListPreviewButton->actions();
// Remove existing same action
@ -397,6 +401,7 @@ void QgsDualView::insertRecentlyUsedDisplayExpression( const QString &expression
mLastDisplayExpressionAction = previewAction;
}
void QgsDualView::mFeatureList_aboutToChangeEditSelection( bool &ok )
{
if ( mLayer->isEditable() && !mAttributeForm->save() )
@ -515,6 +520,12 @@ void QgsDualView::copyCellContent() const
}
}
void QgsDualView::cancelProgress()
{
if ( mProgressDlg )
mProgressDlg->cancel();
}
void QgsDualView::hideEvent( QHideEvent *event )
{
Q_UNUSED( event )

8
src/gui/attributetable/qgsdualview.h
View File

@ -236,6 +236,12 @@ class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBas
*/
void copyCellContent() const;
/**
* Cancel the progress dialog (if any)
* \since QGIS 3.0
*/
void cancelProgress( );
signals:
/**
@ -360,7 +366,7 @@ class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBas
QAction *mLastDisplayExpressionAction = nullptr;
QMenu *mHorizontalHeaderMenu = nullptr;
QgsVectorLayerCache *mLayerCache = nullptr;
QgsVectorLayer *mLayer = nullptr;
QPointer< QgsVectorLayer > mLayer = nullptr;
QProgressDialog *mProgressDlg = nullptr;
QgsIFeatureSelectionManager *mFeatureSelectionManager = nullptr;
QgsDistanceArea mDistanceArea;