Add support for custom resolutions

Add build-time check for qt6-quick3d

kwin/CMakeLists.txt

@@ -4,10 +4,6 @@ project(breezy_desktop VERSION 0.0.1 LANGUAGES CXX)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(CMAKE_CXX_STANDARD 20)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_EXTENSIONS OFF)
-
 include(cmake/default-vars.cmake)
 
 find_package(ECM "5.100" REQUIRED NO_MODULE)
@@ -16,16 +12,13 @@ set(CMAKE_MODULE_PATH
         ${ECM_MODULE_PATH}
         ${ECM_KDE_MODULE_DIR}
 )
-include(cmake/qtversion.cmake)
 include(FeatureSummary)
 include(KDEInstallDirs)
 include(KDECMakeSettings)
 include(KDECompilerSettings NO_POLICY_SCOPE)
 
-include(cmake/qtversion.cmake)
-
 # required frameworks by Core
-find_package(KF${QT_MAJOR_VERSION} ${KF_MIN_VERSION} REQUIRED COMPONENTS
+find_package(KF6 REQUIRED COMPONENTS
     Config
     ConfigWidgets
     CoreAddons
@@ -36,16 +29,25 @@ find_package(KF${QT_MAJOR_VERSION} ${KF_MIN_VERSION} REQUIRED COMPONENTS
     XmlGui
 )
 
-if(${QT_MAJOR_VERSION} EQUAL 6)
+find_package(KWin REQUIRED COMPONENTS kwineffects)
-    find_package(KF${QT_MAJOR_VERSION} ${KF_MIN_VERSION} REQUIRED COMPONENTS KCMUtils)
+message(STATUS "Found KWin Version: ${KWin_VERSION}")
-    find_package(KWin REQUIRED COMPONENTS kwineffects)
-    message(STATUS "Found KWin Version: ${KWin_VERSION}")
-endif ()
 include(cmake/info.cmake)
 find_package(epoxy REQUIRED)
 find_package(XCB REQUIRED COMPONENTS XCB)
 find_package(KWinDBusInterface CONFIG REQUIRED)
 
+find_library(QT6_QUICK3D_LIB
+    NAMES Qt6Quick3D Qt6Quick3D.so Qt6Quick3D.so.6
+    PATH_SUFFIXES lib
+)
+if(NOT QT6_QUICK3D_LIB)
+    message(FATAL_ERROR "Qt6 Quick3D runtime library not found (QtQuick3D). Please install the Qt6 Quick3D runtime.")
+endif()
+set_package_properties(Qt6Quick3D PROPERTIES
+    TYPE RUNTIME
+    PURPOSE "Required at runtime for 3D rendering (Qt Quick 3D)."
+)
+
 add_subdirectory(src)
 ki18n_install(po)
 

kwin/cmake/info.cmake

@@ -1,8 +1,4 @@
-if(${KF_MIN_VERSION} EQUAL 6)
+set(KWIN_EFFECT_INCLUDE_FILE "/usr/include/kwin/effect/effect.h")
-    set(KWIN_EFFECT_INCLUDE_FILE "/usr/include/kwin/effect/effect.h")
-else ()
-    set(KWIN_EFFECT_INCLUDE_FILE "/usr/include/kwineffects.h")
-endif ()
 execute_process(
         COMMAND sh -c "grep '#define KWIN_EFFECT_API_VERSION_MINOR' ${KWIN_EFFECT_INCLUDE_FILE} | awk '{print \$NF}'"
         OUTPUT_VARIABLE KWIN_EFFECT_API_VERSION_MINOR OUTPUT_STRIP_TRAILING_WHITESPACE

kwin/cmake/qtversion.cmake

@@ -1,7 +0,0 @@
-find_package(KF6 QUIET COMPONENTS ConfigWidgets)
-
-if(${KF6_FOUND} EQUAL 0)
-    set(QT_MIN_VERSION "5.15")
-    set(QT_MAJOR_VERSION 5)
-    set(KF_MIN_VERSION "5.78")
-endif ()

kwin/src/kcm/CMakeLists.txt

@@ -1,5 +1,14 @@
-set(breezy_desktop_config_SOURCES breezydesktopeffectkcm.cpp labeledslider.cpp)
+set(breezy_desktop_config_SOURCES
-ki18n_wrap_ui(breezy_desktop_config_SOURCES breezydesktopeffectkcm.ui)
+    breezydesktopeffectkcm.cpp
+    labeledslider.cpp
+    customresolutiondialog.cpp
+    virtualdisplayrow.cpp
+)
+ki18n_wrap_ui(breezy_desktop_config_SOURCES
+    breezydesktopeffectkcm.ui
+    customresolutiondialog.ui
+    virtualdisplayrow.ui
+)
 qt_add_dbus_interface(breezy_desktop_config_SOURCES ${KWIN_EFFECTS_INTERFACE} kwineffects_interface)
 
 kcoreaddons_add_plugin(breezy_desktop_config INSTALL_NAMESPACE "plasma/kcms" SOURCES ${breezy_desktop_config_SOURCES})

kwin/src/kcm/breezydesktopeffectkcm.cpp

@@ -3,6 +3,8 @@
 #include "breezydesktopconfig.h"
 #include "labeledslider.h"
 #include "xrdriveripc.h"
+#include "customresolutiondialog.h"
+#include "virtualdisplayrow.h"
 
 #include <kwineffects_interface.h>
 
@@ -11,6 +13,7 @@
 #include <KLocalizedString>
 #include <KConfigWatcher>
 #include <KSharedConfig>
+#include <KConfigGroup>
 #include <KPluginFactory>
 
 #include <QAction>
@@ -35,11 +38,150 @@
 #include <QPushButton>
 #include <QIcon>
 #include <QTabWidget>
+#include <QInputDialog>
+#include <QSize>
+#include <QDialog>
+#include <QDialogButtonBox>
+#include <QVBoxLayout>
+#include <QFormLayout>
+#include <QSlider>
+#include <QFile>
+#include <QDir>
+#include <QJsonDocument>
 
 Q_LOGGING_CATEGORY(KWIN_XR, "kwin.xr")
 
 static const char EFFECT_GROUP[] = "Effect-breezy_desktop";
 
+namespace {
+// Roles for QComboBox items
+constexpr int ROLE_SIZE = Qt::UserRole + 1;             // QVariant::fromValue(QSize)
+constexpr int ROLE_IS_CUSTOM = Qt::UserRole + 2;        // bool
+constexpr int ROLE_IS_ADD_CUSTOM = Qt::UserRole + 3;    // bool
+
+QString stateDirPath()
+{
+    const QString fallback = QDir::homePath() + QStringLiteral("/.local/state");
+    const QString base = qEnvironmentVariable("XDG_STATE_HOME", fallback);
+    return QDir::cleanPath(base + QStringLiteral("/breezy_kwin"));
+}
+
+QString customResolutionsFilePath()
+{
+    return stateDirPath() + QStringLiteral("/custom_resolutions.json");
+}
+
+QStringList loadCustomResolutions()
+{
+    QFile f(customResolutionsFilePath());
+    if (!f.exists()) return {};
+    if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) return {};
+    const QByteArray data = f.readAll();
+    f.close();
+    const QJsonDocument doc = QJsonDocument::fromJson(data);
+    if (!doc.isArray()) return {};
+    QStringList out;
+    const QJsonArray arr = doc.array();
+    for (const QJsonValue &v : arr) {
+        if (!v.isString()) continue;
+        const QString s = v.toString().trimmed();
+        if (s.isEmpty()) continue;
+        if (!out.contains(s)) out << s; // dedupe while reading to keep UI clean
+    }
+    return out;
+}
+
+void saveCustomResolutions(const QStringList &list)
+{
+    QDir().mkpath(stateDirPath());
+    QFile f(customResolutionsFilePath());
+    if (!f.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text)) return;
+    QJsonArray arr;
+    for (const QString &s : list) arr.push_back(s);
+    const QJsonDocument doc(arr);
+    f.write(doc.toJson(QJsonDocument::Compact));
+    f.close();
+}
+
+bool parseResString(const QString &text, int &w, int &h)
+{
+    const QString t = text.trimmed().toLower();
+    const QString xChar = QString::fromUtf8("x");
+    const QString multChar = QString::fromUtf8("×");
+    QString s = t;
+    s.replace(multChar, xChar);
+    const QStringList parts = s.split(QLatin1Char('x'), Qt::SkipEmptyParts);
+    if (parts.size() != 2) return false;
+    bool okW=false, okH=false;
+    int ww = parts[0].toInt(&okW);
+    int hh = parts[1].toInt(&okH);
+    if (!okW || !okH) return false;
+    if (ww < 320 || hh < 200) return false;
+    if (ww > 32768 || hh > 32768) return false;
+    w = ww; h = hh; return true;
+}
+
+void addResolutionItem(QComboBox *combo, QString label, QSize resolution, bool isCustom, bool isAddCustom) {
+    combo->addItem(label);
+    combo->setItemData(combo->count()-1, QVariant::fromValue(resolution), ROLE_SIZE);
+    combo->setItemData(combo->count()-1, isCustom, ROLE_IS_CUSTOM);
+    combo->setItemData(combo->count()-1, isAddCustom, ROLE_IS_ADD_CUSTOM);
+}
+
+void populateResolutionCombo(QComboBox *combo, const QStringList &custom)
+{
+    if (!combo) return;
+    combo->clear();
+
+    addResolutionItem(combo, QStringLiteral("1080p"), QSize(1920,1080), false, false);
+    addResolutionItem(combo, QStringLiteral("1440p"), QSize(2560,1440), false, false);
+
+    for (const QString &res : custom) {
+        int w=0,h=0;
+        if (!parseResString(res, w, h)) continue;
+        const QString label = QStringLiteral("%1x%2").arg(w).arg(h);
+        addResolutionItem(combo, label, QSize(w,h), true, false);
+    }
+
+    addResolutionItem(combo, QObject::tr("Add custom…"), QSize(), false, true);
+
+    combo->setCurrentIndex(0);
+}
+
+bool isCustomIndex(const QComboBox *combo, int index)
+{
+    if (!combo || index < 0 || index >= combo->count()) return false;
+    return combo->itemData(index, ROLE_IS_CUSTOM).toBool();
+}
+
+bool isAddCustomIndex(const QComboBox *combo, int index)
+{
+    if (!combo || index < 0 || index >= combo->count()) return false;
+    return combo->itemData(index, ROLE_IS_ADD_CUSTOM).toBool();
+}
+
+QSize sizeForIndex(const QComboBox *combo, int index)
+{
+    if (!combo || index < 0 || index >= combo->count()) return {};
+    QVariant v = combo->itemData(index, ROLE_SIZE);
+    if (!v.isValid()) return {};
+    return v.toSize();
+}
+
+bool showCustomResolutionDialog(QWidget *parent, int &outW, int &outH)
+{
+    CustomResolutionDialog dlg(parent);
+    const int res = dlg.exec();
+    if (res == QDialog::Accepted) {
+        outW = dlg.widthValue();
+        outH = dlg.heightValue();
+        return true;
+    }
+    return false;
+}
+
+}
+
 void addShortcutAction(KActionCollection *collection, const BreezyShortcuts::Shortcut &shortcut)
 {
     QAction *action = collection->addAction(shortcut.actionName);
@@ -76,6 +218,76 @@ BreezyDesktopEffectConfig::BreezyDesktopEffectConfig(QObject *parent, const KPlu
             chk->setVisible(true);
             chk->setEnabled(true);
         }
+
+        // Initialize the resolution picker controls
+        if (auto combo = widget()->findChild<QComboBox*>(QStringLiteral("comboAddVirtualDisplay"))) {
+            QStringList custom = loadCustomResolutions();
+            populateResolutionCombo(combo, custom);
+
+            auto removeBtn = widget()->findChild<QPushButton*>(QStringLiteral("buttonRemoveCustomResolution"));
+            auto addBtn = widget()->findChild<QPushButton*>(QStringLiteral("buttonAddVirtualDisplay"));
+
+            combo->setProperty("lastResIndex", 0);
+
+            auto updateRemoveUi = [combo, removeBtn, addBtn]() {
+                if (!removeBtn) return;
+                const bool customSel = isCustomIndex(combo, combo->currentIndex());
+                removeBtn->setEnabled(customSel);
+                removeBtn->setVisible(customSel);
+                if (addBtn) addBtn->setEnabled(!isAddCustomIndex(combo, combo->currentIndex()));
+            };
+
+            connect(combo, qOverload<int>(&QComboBox::currentIndexChanged), this, [this, combo, updateRemoveUi]() {
+                const int idx = combo->currentIndex();
+                if (isAddCustomIndex(combo, idx)) {
+                    const int oldIdx = combo->property("lastResIndex").toInt();
+                    int w = 1920, h = 1080;
+                    if (showCustomResolutionDialog(widget(), w, h)) {
+                        const QString label = QStringLiteral("%1x%2").arg(w).arg(h);
+                        QStringList custom = loadCustomResolutions();
+                        if (!custom.contains(label)) {
+                            custom << label;
+                            saveCustomResolutions(custom);
+                        }
+                        populateResolutionCombo(combo, custom);
+                        const int newIndex = combo->findText(label);
+                        if (newIndex >= 0) combo->setCurrentIndex(newIndex);
+                        combo->setProperty("lastResIndex", combo->currentIndex());
+                    } else {
+                        // Revert to previous selection if dialog cancelled
+                        combo->setCurrentIndex(oldIdx);
+                    }
+                } else {
+                    combo->setProperty("lastResIndex", idx);
+                }
+                updateRemoveUi();
+            });
+            updateRemoveUi();
+
+            if (removeBtn) {
+                connect(removeBtn, &QPushButton::clicked, this, [this, combo]() {
+                    const int idx = combo->currentIndex();
+                    if (!isCustomIndex(combo, idx)) return;
+                    const QString label = combo->itemText(idx);
+                    QStringList custom = loadCustomResolutions();
+                    custom.removeAll(label);
+                    saveCustomResolutions(custom);
+                    populateResolutionCombo(combo, custom);
+                });
+            }
+
+
+            if (addBtn) {
+                connect(addBtn, &QPushButton::clicked, this, [this, combo]() {
+                    const int idx = combo->currentIndex();
+                    const QSize sz = sizeForIndex(combo, idx);
+                    if (sz.isValid()) {
+                        auto list = dbusAddVirtualDisplay(sz.width(), sz.height());
+                        renderVirtualDisplays(list);
+                    }
+                });
+            }
+        }
     }
 
     m_statePollTimer.setInterval(2000);
@@ -171,19 +383,7 @@ BreezyDesktopEffectConfig::BreezyDesktopEffectConfig(QObject *parent, const KPlu
         }
     }
 
-    // Wire Add Virtual Display buttons via DBus to the effect
+    // Resolution picker wiring handled above in Wayland section
-    if (auto btn1080p = widget()->findChild<QPushButton*>("buttonAdd1080p")) {
-        connect(btn1080p, &QPushButton::clicked, this, [this]() {
-            auto list = dbusAddVirtualDisplay(1920, 1080);
-            renderVirtualDisplays(list);
-        });
-    }
-    if (auto btn1440p = widget()->findChild<QPushButton*>("buttonAdd1440p")) {
-        connect(btn1440p, &QPushButton::clicked, this, [this]() {
-            auto list = dbusAddVirtualDisplay(2560, 1440);
-            renderVirtualDisplays(list);
-        });
-    }
     if (auto lookAheadOverrideSlider = widget()->findChild<LabeledSlider*>("kcfg_LookAheadOverride")) {
         lookAheadOverrideSlider->setValueText(-1, i18n("Default"));
     }
@@ -381,38 +581,12 @@ void BreezyDesktopEffectConfig::renderVirtualDisplays(const QVariantList &rows)
         const int w = unwrapValue(row.value(QStringLiteral("width"))).toInt();
         const int h = unwrapValue(row.value(QStringLiteral("height"))).toInt();
 
-        QWidget *rowWidget = new QWidget(listContainer);
+        auto *rowWidget = new VirtualDisplayRow(listContainer);
-        auto *hl = new QHBoxLayout(rowWidget);
+        rowWidget->setInfo(id, w, h);
-        hl->setContentsMargins(0, 0, 0, 0);
+        connect(rowWidget, &VirtualDisplayRow::removeRequested, this, [this](const QString &vid) {
-
+            auto list = dbusRemoveVirtualDisplay(vid);
-        auto *spacer = new QWidget(rowWidget);
-        spacer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
-        hl->addWidget(spacer, 1);
-
-        auto *icon = new QLabel(rowWidget);
-        icon->setPixmap(QIcon::fromTheme(QStringLiteral("video-display-symbolic")).pixmap(16, 16));
-        icon->setContentsMargins(8, 0, 8, 0);
-        hl->addWidget(icon, 0);
-
-        auto *idLabel = new QLabel(QStringLiteral("%1").arg(id), rowWidget);
-        idLabel->setContentsMargins(8, 0, 8, 0);
-        hl->addWidget(idLabel, 0);
-
-        auto *resLabel = new QLabel(QStringLiteral("%1x%2").arg(w).arg(h), rowWidget);
-        resLabel->setContentsMargins(8, 0, 8, 0);
-        hl->addWidget(resLabel, 0);
-
-        auto *removeBtn = new QPushButton(rowWidget);
-        removeBtn->setIcon(QIcon::fromTheme(QStringLiteral("user-trash-symbolic")));
-        removeBtn->setToolTip(QStringLiteral("Remove virtual display"));
-        removeBtn->setObjectName(QStringLiteral("remove-virtual-display"));
-        hl->addWidget(removeBtn, 0);
-
-        connect(removeBtn, &QPushButton::clicked, this, [this, id]() {
-            auto list = dbusRemoveVirtualDisplay(id);
             renderVirtualDisplays(list);
         });
-
         listLayout->addWidget(rowWidget);
     }
 }

kwin/src/kcm/breezydesktopeffectkcm.ui

@@ -219,17 +219,47 @@
             </property>
             <layout class="QHBoxLayout" name="layoutVirtualDisplayButtons">
               <item>
-                <widget class="QPushButton" name="buttonAdd1080p">
+                <widget class="QComboBox" name="comboAddVirtualDisplay">
+                  <item>
                     <property name="text">
-                    <string>+ 1080p</string>
+                      <string>1080p</string>
+                    </property>
+                  </item>
+                  <item>
+                    <property name="text">
+                      <string>1440p</string>
+                    </property>
+                  </item>
+                  <item>
+                    <property name="text">
+                      <string>Add custom…</string>
+                    </property>
+                  </item>
+                </widget>
+              </item>
+              <item>
+                <widget class="QPushButton" name="buttonRemoveCustomResolution">
+                  <property name="toolTip">
+                    <string>Remove custom resolution</string>
+                  </property>
+                  <property name="icon">
+                    <iconset theme="list-remove-symbolic"/>
+                  </property>
+                  <property name="flat"><bool>true</bool></property>
+                  <property name="visible">
+                    <bool>false</bool>
+                  </property>
+                  <property name="enabled">
+                    <bool>false</bool>
                   </property>
                 </widget>
               </item>
               <item>
-                <widget class="QPushButton" name="buttonAdd1440p">
+                <widget class="QPushButton" name="buttonAddVirtualDisplay">
-                  <property name="text">
+                  <property name="icon">
-                    <string>+ 1440p</string>
+                    <iconset theme="list-add-symbolic"/>
                   </property>
+                  <property name="flat"><bool>true</bool></property>
                 </widget>
               </item>
               <item>

kwin/src/kcm/customresolutiondialog.cpp

@@ -0,0 +1,20 @@
+#include "customresolutiondialog.h"
+#include "ui_customresolutiondialog.h"
+
+CustomResolutionDialog::CustomResolutionDialog(QWidget *parent)
+    : QDialog(parent), ui(new Ui::CustomResolutionDialog)
+{
+    ui->setupUi(this);
+}
+
+CustomResolutionDialog::~CustomResolutionDialog() {
+    delete ui;
+}
+
+int CustomResolutionDialog::widthValue() const {
+    return ui->sliderWidth->value();
+}
+
+int CustomResolutionDialog::heightValue() const {
+    return ui->sliderHeight->value();
+}

kwin/src/kcm/customresolutiondialog.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <QDialog>
+
+namespace Ui { class CustomResolutionDialog; }
+
+class CustomResolutionDialog : public QDialog {
+    Q_OBJECT
+public:
+    explicit CustomResolutionDialog(QWidget *parent = nullptr);
+    ~CustomResolutionDialog() override;
+
+    int widthValue() const;
+    int heightValue() const;
+
+private:
+    Ui::CustomResolutionDialog *ui;
+};

kwin/src/kcm/customresolutiondialog.ui

@@ -0,0 +1,209 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CustomResolutionDialog</class>
+ <widget class="QDialog" name="CustomResolutionDialog">
+  <property name="windowTitle">
+   <string>Add custom resolution</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <layout class="QFormLayout" name="formLayout">
+     <item row="0" column="0">
+      <widget class="QLabel" name="labelWidth">
+       <property name="text">
+        <string>Width</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+            <widget class="QWidget" name="widthRow" native="true">
+             <layout class="QHBoxLayout" name="horizontalLayoutWidth">
+                <property name="leftMargin">
+                 <number>0</number>
+                </property>
+                <property name="topMargin">
+                 <number>0</number>
+                </property>
+                <property name="rightMargin">
+                 <number>0</number>
+                </property>
+                <property name="bottomMargin">
+                 <number>0</number>
+                </property>
+        <item>
+         <widget class="QSlider" name="sliderWidth">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="minimum">
+           <number>640</number>
+          </property>
+          <property name="maximum">
+           <number>3840</number>
+          </property>
+          <property name="singleStep">
+           <number>2</number>
+          </property>
+          <property name="pageStep">
+           <number>10</number>
+          </property>
+          <property name="value">
+           <number>1920</number>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="labelWidthValue">
+          <property name="minimumWidth">
+           <number>50</number>
+          </property>
+          <property name="alignment">
+           <set>Qt::AlignRight|Qt::AlignVCenter</set>
+          </property>
+          <property name="text">
+           <string>1920</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+     </item>
+     <item row="1" column="0">
+      <widget class="QLabel" name="labelHeight">
+       <property name="text">
+        <string>Height</string>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+            <widget class="QWidget" name="heightRow" native="true">
+             <layout class="QHBoxLayout" name="horizontalLayoutHeight">
+                <property name="leftMargin">
+                 <number>0</number>
+                </property>
+                <property name="topMargin">
+                 <number>0</number>
+                </property>
+                <property name="rightMargin">
+                 <number>0</number>
+                </property>
+                <property name="bottomMargin">
+                 <number>0</number>
+                </property>
+        <item>
+         <widget class="QSlider" name="sliderHeight">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="minimum">
+           <number>480</number>
+          </property>
+          <property name="maximum">
+           <number>2160</number>
+          </property>
+          <property name="singleStep">
+           <number>2</number>
+          </property>
+          <property name="pageStep">
+           <number>10</number>
+          </property>
+          <property name="value">
+           <number>1080</number>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="labelHeightValue">
+          <property name="minimumWidth">
+           <number>50</number>
+          </property>
+          <property name="alignment">
+           <set>Qt::AlignRight|Qt::AlignVCenter</set>
+          </property>
+          <property name="text">
+           <string>1080</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>sliderWidth</sender>
+   <signal>valueChanged(int)</signal>
+   <receiver>labelWidthValue</receiver>
+   <slot>setNum(int)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>264</x>
+     <y>50</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>475</x>
+     <y>50</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>sliderHeight</sender>
+   <signal>valueChanged(int)</signal>
+   <receiver>labelHeightValue</receiver>
+   <slot>setNum(int)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>264</x>
+     <y>100</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>475</x>
+     <y>100</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>CustomResolutionDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>185</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>179</x>
+     <y>93</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>CustomResolutionDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>421</x>
+     <y>185</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>244</x>
+     <y>93</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

kwin/src/kcm/virtualdisplayrow.cpp

@@ -0,0 +1,27 @@
+#include "virtualdisplayrow.h"
+#include "ui_virtualdisplayrow.h"
+
+#include <QIcon>
+
+VirtualDisplayRow::VirtualDisplayRow(QWidget *parent)
+    : QWidget(parent), ui(new Ui::VirtualDisplayRow)
+{
+    ui->setupUi(this);
+    // Set themed icons at runtime to honor system theme
+    ui->icon->setPixmap(QIcon::fromTheme(QStringLiteral("video-display-symbolic")).pixmap(16, 16));
+    ui->buttonRemove->setIcon(QIcon::fromTheme(QStringLiteral("user-trash-symbolic")));
+
+    connect(ui->buttonRemove, &QPushButton::clicked, this, [this]() {
+        Q_EMIT removeRequested(m_id);
+    });
+}
+
+VirtualDisplayRow::~VirtualDisplayRow() {
+    delete ui;
+}
+
+void VirtualDisplayRow::setInfo(const QString &id, int w, int h) {
+    m_id = id;
+    ui->labelId->setText(id);
+    ui->labelRes->setText(QStringLiteral("%1x%2").arg(w).arg(h));
+}

kwin/src/kcm/virtualdisplayrow.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <QWidget>
+
+namespace Ui { class VirtualDisplayRow; }
+
+class VirtualDisplayRow : public QWidget {
+    Q_OBJECT
+public:
+    explicit VirtualDisplayRow(QWidget *parent = nullptr);
+    ~VirtualDisplayRow() override;
+
+    void setInfo(const QString &id, int w, int h);
+
+Q_SIGNALS:
+    void removeRequested(const QString &id);
+
+private:
+    Ui::VirtualDisplayRow *ui;
+    QString m_id;
+};

kwin/src/kcm/virtualdisplayrow.ui

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>VirtualDisplayRow</class>
+ <widget class="QWidget" name="VirtualDisplayRow">
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QWidget" name="spacer" native="true">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+    </widget>
+   </item>
+  <item>
+   <widget class="QLabel" name="icon"/>
+  </item>
+  <item>
+   <widget class="QLabel" name="labelId">
+    <property name="text">
+    <string>ID</string>
+    </property>
+   </widget>
+  </item>
+  <item>
+   <widget class="QLabel" name="labelRes">
+    <property name="text">
+    <string>WxH</string>
+    </property>
+   </widget>
+  </item>
+   <item>
+    <widget class="QPushButton" name="buttonRemove">
+     <property name="toolTip">
+      <string>Remove virtual display</string>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>