add WSettingsCheckBoxLabel to replace the click eventFilter

CMakeLists.txt

@@ -1580,6 +1580,7 @@ add_library(
   src/widget/wscrollable.cpp
   src/widget/wsearchlineedit.cpp
   src/widget/wsearchrelatedtracksmenu.cpp
+  src/widget/wsettingscheckboxlabel.cpp
   src/widget/wsingletoncontainer.cpp
   src/widget/wsizeawarestack.cpp
   src/widget/wskincolor.cpp

src/controllers/legacycontrollersettings.cpp

@@ -5,7 +5,6 @@
 #include <QColorDialog>
 #include <QComboBox>
 #include <QDoubleSpinBox>
-#include <QEvent>
 #include <QFileDialog>
 #include <QLabel>
 #include <QLayout>
@@ -18,6 +17,7 @@
 #include "moc_legacycontrollersettings.cpp"
 #include "util/assert.h"
 #include "util/parented_ptr.h"
+#include "widget/wsettingscheckboxlabel.h"
 
 namespace {
 
@@ -163,18 +163,13 @@ QWidget* LegacyControllerBooleanSetting::buildInputWidget(QWidget* pParent) {
     });
 
     // We want to format the checkbox label with html styles. This is not possible
-    // so we attach a separate QLabel and, in order to get a clickable label like
-    // with QCheckBox, we associate the label with the checkbox (buddy).
-    // When the label is clicked we toggle the checkbox in the function
-    // eventFilter() of helper class ToggleCheckboxEventFilter.
-    auto pLabelWidget = make_parented<QLabel>(pWidget);
+    // so we attach a separate label. In order to get a clickable label like
+    // with QCheckBox, we use a custom QLabel that toggles its buddy QCheckBox
+    // (on left-click, like QCheckBox) and sets focus on it.
+    auto pLabelWidget = make_parented<WSettingsCheckBoxLabel>(pWidget);
     pLabelWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Maximum);
     pLabelWidget->setText(label());
     pLabelWidget->setBuddy(pCheckBox);
-    if (!m_pToggleCheckboxEventFilter) {
-        m_pToggleCheckboxEventFilter = make_parented<ToggleCheckboxEventFilter>(this);
-    }
-    pLabelWidget->installEventFilter(m_pToggleCheckboxEventFilter.get());
 
     QBoxLayout* pLayout = new QHBoxLayout();
 
@@ -196,23 +191,6 @@ bool LegacyControllerBooleanSetting::match(const QDomElement& element) {
                     Qt::CaseInsensitive) == 0;
 }
 
-bool LegacyControllerBooleanSetting::ToggleCheckboxEventFilter::eventFilter(
-        QObject* pObj, QEvent* pEvent) {
-    // eventFilter was a method of LegacyControllerBooleanSetting, but this
-    // doesn't work, as LegacyControllerBooleanSetting is created from a
-    // different thread, and Qt cannot filter events for objects in a
-    // different thread.
-
-    QLabel* pLabel = qobject_cast<QLabel*>(pObj);
-    if (pLabel && pEvent->type() == QEvent::MouseButtonPress) {
-        QCheckBox* pCheckBox = qobject_cast<QCheckBox*>(pLabel->buddy());
-        if (pCheckBox) {
-            pCheckBox->toggle();
-        }
-    }
-    return QObject::eventFilter(pObj, pEvent);
-}
-
 template<class SettingType,
         Serializer<SettingType> ValueSerializer,
         Deserializer<SettingType> ValueDeserializer,

src/controllers/legacycontrollersettings.h

@@ -214,17 +214,6 @@ class LegacyControllerBooleanSetting
 
     QWidget* buildInputWidget(QWidget* parent) override;
 
-  private:
-    class ToggleCheckboxEventFilter : public QObject {
-      public:
-        ToggleCheckboxEventFilter(QObject* pParent)
-                : QObject(pParent) {
-        }
-        bool eventFilter(QObject* pObj, QEvent* pEvent) override;
-    };
-
-    parented_ptr<ToggleCheckboxEventFilter> m_pToggleCheckboxEventFilter;
-
     FRIEND_TEST(LegacyControllerMappingSettingsTest, booleanSettingEditing);
 };
 

src/widget/wsettingscheckboxlabel.cpp

@@ -0,0 +1,17 @@
+#include "widget/wsettingscheckboxlabel.h"
+
+#include <QCheckBox>
+#include <QMouseEvent>
+
+#include "moc_wsettingscheckboxlabel.cpp"
+
+void WSettingsCheckBoxLabel::mousePressEvent(QMouseEvent* pEvent) {
+    if (pEvent->buttons().testFlag(Qt::LeftButton)) {
+        QCheckBox* pCB = qobject_cast<QCheckBox*>(buddy());
+        if (pCB) {
+            pCB->toggle();
+            pCB->setFocus(Qt::MouseFocusReason);
+        }
+    }
+    QLabel::mousePressEvent(pEvent);
+}

src/widget/wsettingscheckboxlabel.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <QLabel>
+
+/// This is a QLabel for use in controller settings.
+/// It is expected to have a QCheckBox buddy assigned. If so, left-click on the
+/// label will toggle the checkbox and set focus on it.
+class WSettingsCheckBoxLabel : public QLabel {
+    Q_OBJECT
+  public:
+    explicit WSettingsCheckBoxLabel(QWidget* pParent = nullptr,
+            Qt::WindowFlags flags = Qt::WindowFlags())
+            : QLabel(pParent, flags) {
+
+              };
+    explicit WSettingsCheckBoxLabel(const QString& text,
+            QWidget* pParent = nullptr,
+            Qt::WindowFlags flags = Qt::WindowFlags())
+            : QLabel(text, pParent, flags) {
+              };
+
+  protected:
+    void mousePressEvent(QMouseEvent* pEvent) override;
+};