cmake-gui: Fix conversion warnings about Qt indexing types

Qt 5 uses `int` for indexing, and Qt 6 uses `qsizetype`.  Add helper
types and casts to the appropriate type to avoid conversion warnings.

Source/QtDialog/AddCacheEntry.cxx

@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "AddCacheEntry.h"
 
+#include "QCMakeSizeType.h"
 #include <QCompleter>
 #include <QMetaProperty>
 
@@ -88,7 +89,7 @@ QString AddCacheEntry::typeString() const
 
 void AddCacheEntry::onCompletionActivated(const QString& text)
 {
-  int idx = this->VarNames.indexOf(text);
+  cm_qsizetype idx = this->VarNames.indexOf(text);
   if (idx != -1) {
     QString vartype = this->VarTypes[idx];
     for (int i = 0; i < NumTypes; i++) {

Source/QtDialog/CMakeLists.txt

@@ -175,6 +175,7 @@ add_library(
   QCMakePresetComboBox.h
   QCMakePresetItemModel.cxx
   QCMakePresetItemModel.h
+  QCMakeSizeType.h
   QCMakeWidgets.cxx
   QCMakeWidgets.h
   RegexExplorer.cxx

Source/QtDialog/CMakeSetupDialog.cxx

@@ -32,6 +32,7 @@
 
 #include "QCMake.h"
 #include "QCMakeCacheView.h"
+#include "QCMakeSizeType.h"
 
 #include "cmSystemTools.h"
 #include "cmVersion.h"
@@ -1120,12 +1121,12 @@ void CMakeSetupDialog::saveBuildPaths(const QStringList& paths)
   QSettings settings;
   settings.beginGroup("Settings/StartPath");
 
-  int num = paths.count();
+  cm_qsizetype num = paths.count();
   if (num > 10) {
     num = 10;
   }
 
-  for (int i = 0; i < num; i++) {
+  for (cm_qsizetype i = 0; i < num; i++) {
     settings.setValue(QString("WhereBuild%1").arg(i), paths[i]);
   }
 }

Source/QtDialog/FirstConfigure.cxx

@@ -1,6 +1,7 @@
 
 #include "FirstConfigure.h"
 
+#include "QCMakeSizeType.h"
 #include <QComboBox>
 #include <QRadioButton>
 #include <QSettings>
@@ -242,10 +243,12 @@ void StartCompilerSetup::onGeneratorChanged(int index)
 
     // Default to generator platform from environment
     if (!DefaultGeneratorPlatform.isEmpty()) {
-      int platform_index = platforms.indexOf(DefaultGeneratorPlatform);
+      cm_qsizetype platform_index =
+        platforms.indexOf(DefaultGeneratorPlatform);
       if (platform_index != -1) {
         // The index is off-by-one due to the first empty item added above.
-        this->PlatformOptions->setCurrentIndex(platform_index + 1);
+        this->PlatformOptions->setCurrentIndex(
+          static_cast<int>(platform_index + 1));
       }
     }
   } else {

Source/QtDialog/QCMake.cxx

@@ -6,6 +6,7 @@
 
 #include <cm/memory>
 
+#include "QCMakeSizeType.h"
 #include <QCoreApplication>
 #include <QDir>
 #include <QString>
@@ -326,7 +327,7 @@ void QCMake::setProperties(const QCMakePropertyList& newProps)
 
     QCMakeProperty prop;
     prop.Key = QString::fromStdString(key);
-    int idx = props.indexOf(prop);
+    cm_qsizetype idx = props.indexOf(prop);
     if (idx == -1) {
       toremove.append(QString::fromStdString(key));
     } else {

Source/QtDialog/QCMakeCacheView.cxx

@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "QCMakeCacheView.h"
 
+#include "QCMakeSizeType.h"
 #include "QCMakeWidgets.h"
 #include <QApplication>
 #include <QEvent>
@@ -188,7 +189,7 @@ QCMakeCacheModel::~QCMakeCacheModel() = default;
 
 static uint qHash(const QCMakeProperty& p)
 {
-  return qHash(p.Key);
+  return static_cast<uint>(qHash(p.Key));
 }
 
 void QCMakeCacheModel::setShowNewProperties(bool f)
@@ -241,7 +242,7 @@ void QCMakeCacheModel::setProperties(const QCMakePropertyList& props)
   bool b = this->blockSignals(true);
 
   this->clear();
-  this->NewPropertyCount = newProps.size();
+  this->NewPropertyCount = static_cast<int>(newProps.size());
 
   if (View == FlatView) {
     QCMakePropertyList newP = newProps.values();
@@ -297,8 +298,8 @@ void QCMakeCacheModel::setProperties(const QCMakePropertyList& props)
       parentItems[1]->setData(1, GroupRole);
       root->appendRow(parentItems);
 
-      int num = props2.size();
-      for (int i = 0; i < num; i++) {
+      cm_qsizetype num = props2.size();
+      for (cm_qsizetype i = 0; i < num; i++) {
         QCMakeProperty const& prop = props2[i];
         QList<QStandardItem*> items;
         items.append(new QStandardItem());
@@ -319,8 +320,8 @@ void QCMakeCacheModel::setProperties(const QCMakePropertyList& props)
       root->appendRow(parentItem);
       parentItem->setData(1, GroupRole);
 
-      int num = props2.size();
-      for (int i = 0; i < num; i++) {
+      cm_qsizetype num = props2.size();
+      for (cm_qsizetype i = 0; i < num; i++) {
         QCMakeProperty const& prop = props2[i];
         QList<QStandardItem*> items;
         items.append(new QStandardItem());
@@ -349,8 +350,8 @@ void QCMakeCacheModel::setViewType(QCMakeCacheModel::ViewType t)
   QCMakePropertyList props = this->properties();
   QCMakePropertyList oldProps;
   int numNew = this->NewPropertyCount;
-  int numTotal = props.count();
-  for (int i = numNew; i < numTotal; i++) {
+  cm_qsizetype numTotal = props.count();
+  for (cm_qsizetype i = numNew; i < numTotal; i++) {
     oldProps.append(props[i]);
   }
 

Source/QtDialog/QCMakePresetItemModel.cxx

@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "QCMakePresetItemModel.h"
 
+#include "QCMakeSizeType.h"
 #include <QFont>
 
 QCMakePresetItemModel::QCMakePresetItemModel(QObject* parent)
@@ -27,7 +28,8 @@ QVariant QCMakePresetItemModel::data(const QModelIndex& index, int role) const
       if (index.internalId() == SEPARATOR_INDEX) {
         return QVariant{};
       }
-      auto const& preset = this->m_presets[index.internalId()];
+      auto const& preset =
+        this->m_presets[static_cast<cm_qsizetype>(index.internalId())];
       return preset.displayName.isEmpty() ? preset.name : preset.displayName;
     }
     case Qt::ToolTipRole:
@@ -37,7 +39,8 @@ QVariant QCMakePresetItemModel::data(const QModelIndex& index, int role) const
       if (index.internalId() == SEPARATOR_INDEX) {
         return QVariant{};
       }
-      return this->m_presets[index.internalId()].description;
+      return this->m_presets[static_cast<cm_qsizetype>(index.internalId())]
+        .description;
     case Qt::UserRole:
       if (index.internalId() == CUSTOM_INDEX) {
         return QVariant{};
@@ -45,7 +48,8 @@ QVariant QCMakePresetItemModel::data(const QModelIndex& index, int role) const
       if (index.internalId() == SEPARATOR_INDEX) {
         return QVariant{};
       }
-      return QVariant::fromValue(this->m_presets[index.internalId()]);
+      return QVariant::fromValue(
+        this->m_presets[static_cast<cm_qsizetype>(index.internalId())]);
     case Qt::FontRole:
       if (index.internalId() == CUSTOM_INDEX) {
         QFont font;
@@ -64,7 +68,8 @@ Qt::ItemFlags QCMakePresetItemModel::flags(const QModelIndex& index) const
     Qt::ItemIsEditable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
   if (index.internalId() != SEPARATOR_INDEX &&
       (index.internalId() == CUSTOM_INDEX ||
-       this->m_presets[index.internalId()].enabled)) {
+       this->m_presets[static_cast<cm_qsizetype>(index.internalId())]
+         .enabled)) {
     flags |= Qt::ItemIsSelectable | Qt::ItemIsEnabled;
   }
   return flags;
@@ -78,7 +83,7 @@ int QCMakePresetItemModel::rowCount(const QModelIndex& parent) const
   if (this->m_presets.empty()) {
     return 1;
   }
-  return this->m_presets.size() + 2;
+  return static_cast<int>(this->m_presets.size() + 2);
 }
 
 int QCMakePresetItemModel::columnCount(const QModelIndex& parent) const
@@ -139,5 +144,5 @@ int QCMakePresetItemModel::presetNameToRow(const QString& name) const
     index++;
   }
 
-  return this->m_presets.size() + 1;
+  return static_cast<int>(this->m_presets.size() + 1);
 }

Source/QtDialog/QCMakeSizeType.h

@@ -0,0 +1,12 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include <QtGlobal>
+
+// The signed integer type that Qt uses for indexing.
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+using cm_qsizetype = qsizetype;
+#else
+using cm_qsizetype = int;
+#endif