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Avoid a crash on Kwin decoration KCM teardown 

Summary:
As described in https://bugreports.qt.io/browse/QTBUG-57714  exposing a
QWidget as a context item to QtQuick can crash. Especially as the
engine's context property gets deleted whilst deleting the parent item.

This patch reworks the code so that the models are exposed to QML
directly rather than going through a QWidget.

CCBUG: 373628

Test Plan:
Pressing back whilst in the decoration KCM used to crash every time, now it doesn't.
I still have the buttons.

Reviewers: #plasma, graesslin

Reviewed By: #plasma, graesslin

Subscribers: graesslin, cfeck, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D4533
icc-effect-5.14.5
David Edmundson 2017-02-10 10:52:48 +01:00
parent c2bc7d4d04
commit 29179f115c
3 changed files with 7 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
kcmkwin/kwindecoration/kcm.cpp
View File

@ -100,7 +100,10 @@ ConfigurationModule::ConfigurationModule(QWidget *parent, const QVariantList &ar
m_quickView->rootContext()->setContextProperty(QStringLiteral("decorationsModel"), m_proxyModel);
updateColors();
m_quickView->rootContext()->setContextProperty("_borderSizesIndex", 3); // 3 is normal
m_quickView->rootContext()->setContextProperty("configurationModule", this);
m_quickView->rootContext()->setContextProperty("leftButtons", m_leftButtons);
m_quickView->rootContext()->setContextProperty("rightButtons", m_rightButtons);
m_quickView->rootContext()->setContextProperty("availableButtons", m_availableButtons);
m_quickView->rootContext()->setContextProperty("titleFont", QFontDatabase::systemFont(QFontDatabase::TitleFont));
m_quickView->setResizeMode(QQuickView::SizeRootObjectToView);
m_quickView->setSource(QUrl::fromLocalFile(QStandardPaths::locate(QStandardPaths::GenericDataLocation, QStringLiteral("kwin/kcm_kwindecoration/main.qml"))));
@ -406,21 +409,6 @@ void ConfigurationModule::showKNS(const QString &config)
delete downloadDialog;
}
QAbstractItemModel *ConfigurationModule::leftButtons() const
{
return m_leftButtons;
}
QAbstractItemModel *ConfigurationModule::rightButtons() const
{
return m_rightButtons;
}
QAbstractItemModel *ConfigurationModule::availableButtons() const
{
return m_availableButtons;
}
bool ConfigurationModule::eventFilter(QObject *watched, QEvent *e)
{
if (watched != m_ui) {

7
kcmkwin/kwindecoration/kcm.h
View File

@ -47,17 +47,10 @@ public:
class ConfigurationModule : public KCModule
{
Q_OBJECT
Q_PROPERTY(QAbstractItemModel* leftButtons READ leftButtons CONSTANT)
Q_PROPERTY(QAbstractItemModel* rightButtons READ rightButtons CONSTANT)
Q_PROPERTY(QAbstractItemModel* availableButtons READ availableButtons CONSTANT)
public:
explicit ConfigurationModule(QWidget *parent = nullptr, const QVariantList &args = QVariantList());
virtual ~ConfigurationModule();
QAbstractItemModel *leftButtons() const;
QAbstractItemModel *rightButtons() const;
QAbstractItemModel *availableButtons() const;
bool eventFilter(QObject *watched, QEvent *e) override;
public Q_SLOTS:

6
kcmkwin/kwindecoration/qml/Buttons.qml
View File

@ -63,7 +63,7 @@ Item {
id: leftButtonsView
anchors.left: parent.left;
height: buttonPreviewRow.height
model: configurationModule.leftButtons
model: leftButtons
key: "decoButtonLeft"
}
Item {
@ -81,7 +81,7 @@ Item {
id: rightButtonsView
anchors.right: parent.right;
height: buttonPreviewRow.height
model: configurationModule.rightButtons
model: rightButtons
key: "decoButtonRight"
}
DropArea {
@ -144,7 +144,7 @@ Item {
GridView {
id: availableGrid
Layout.fillWidth: true
model: configurationModule.availableButtons
model: availableButtons
interactive: false
cellWidth: iconLabel.implicitWidth
cellHeight: units.iconSizes.small + iCannotBelieveIDoThis.implicitHeight + 4*units.smallSpacing