center checkboxes in layouts window

app/CMakeLists.txt

@@ -20,6 +20,7 @@ set(lattedock-app_SRCS
     layoutsettings.cpp
     layoutconfigdialog.cpp
     importer.cpp
+    layoutsDelegates/checkboxdelegate.cpp
     main.cpp
 )
 

app/layoutconfigdialog.cpp

@@ -22,6 +22,7 @@
 #include "ui_layoutconfigdialog.h"
 #include "layoutconfigdialog.h"
 #include "layoutsettings.h"
+#include "layoutsDelegates/checkboxdelegate.h"
 
 #include <QDir>
 #include <QStandardItem>
@@ -64,6 +65,8 @@ LayoutConfigDialog::LayoutConfigDialog(QWidget *parent, LayoutManager *manager)
     connect(m_manager, &LayoutManager::currentLayoutNameChanged, this, &LayoutConfigDialog::currentLayoutNameChanged);
 
     loadLayouts();
+
+    ui->layoutsView->setItemDelegateForColumn(3, new CheckBoxDelegate(this));
 }
 
 LayoutConfigDialog::~LayoutConfigDialog()

app/layoutsDelegates/checkboxdelegate.cpp

@@ -0,0 +1,63 @@
+#include "checkboxdelegate.h"
+
+#include <QApplication>
+#include <QEvent>
+#include <QKeyEvent>
+#include <QMouseEvent>
+
+CheckBoxDelegate::CheckBoxDelegate(QObject *parent)
+    : QStyledItemDelegate(parent)
+{
+}
+
+void CheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    QStyleOptionViewItem viewItemOption(option);
+
+    QRect newRect = QStyle::alignedRect(option.direction, Qt::AlignCenter,
+                                        QSize(option.decorationSize.width(), option.decorationSize.height()),
+                                        QRect(option.rect.x(), option.rect.y(),
+                                                option.rect.width(), option.rect.height()));
+    viewItemOption.rect = newRect;
+
+    QStyledItemDelegate::paint(painter, viewItemOption, index);
+}
+
+bool CheckBoxDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option,
+                                   const QModelIndex &index)
+{
+    Q_ASSERT(event);
+    Q_ASSERT(model);
+
+    // make sure that the item is checkable
+    Qt::ItemFlags flags = model->flags(index);
+
+    if (!(flags & Qt::ItemIsUserCheckable) || !(flags & Qt::ItemIsEnabled))
+        return false;
+
+    // make sure that we have a check state
+    QVariant value = index.data(Qt::CheckStateRole);
+
+    if (!value.isValid())
+        return false;
+
+    // make sure that we have the right event type
+    if (event->type() == QEvent::MouseButtonRelease) {
+        QRect checkRect = QStyle::alignedRect(option.direction, Qt::AlignCenter,
+                                              option.decorationSize,
+                                              QRect(option.rect.x(), option.rect.y(),
+                                                      option.rect.width(), option.rect.height()));
+
+        if (!checkRect.contains(static_cast<QMouseEvent *>(event)->pos()))
+            return false;
+    } else if (event->type() == QEvent::KeyPress) {
+        if (static_cast<QKeyEvent *>(event)->key() != Qt::Key_Space && static_cast<QKeyEvent *>(event)->key() != Qt::Key_Select)
+            return false;
+    } else {
+        return false;
+    }
+
+    Qt::CheckState state = (static_cast<Qt::CheckState>(value.toInt()) == Qt::Checked
+                            ? Qt::Unchecked : Qt::Checked);
+    return model->setData(index, state, Qt::CheckStateRole);
+}

app/layoutsDelegates/checkboxdelegate.h

@@ -0,0 +1,9 @@
+#include <QStyledItemDelegate>
+
+class CheckBoxDelegate : public QStyledItemDelegate {
+public:
+    CheckBoxDelegate(QObject *parent = 0);
+
+    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
+    virtual bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index);
+};