feat: Added icons to instances in the explorer

assets/icons/Silk-Icons.LICENSE

@@ -0,0 +1,22 @@
+Silk icon set 1.3
+
+_________________________________________
+Mark James
+http://www.famfamfam.com/lab/icons/silk/
+_________________________________________
+
+This work is licensed under a
+Creative Commons Attribution 2.5 License.
+[ http://creativecommons.org/licenses/by/2.5/ ]
+
+This means you may use it for any purpose,
+and make any changes you like.
+All I ask is that you include a link back
+to this page in your credits.
+
+Are you using this icon set? Send me an email
+(including a link or picture if available) to
+mjames@gmail.com
+
+Any other questions about this icon set please
+contact mjames@gmail.com

editor/explorermodel.cpp

@@ -1,14 +1,20 @@
 #include "explorermodel.h"
 #include "objects/base/instance.h"
 #include "qcontainerfwd.h"
+#include "qicon.h"
+#include "qimage.h"
+#include "qnamespace.h"
 #include "qobject.h"
 #include "qwidget.h"
 #include "common.h"
 #include <algorithm>
 #include <optional>
+#include "objects/base/instance.h"
 
 // https://doc.qt.io/qt-6/qtwidgets-itemviews-simpletreemodel-example.html#testing-the-model
 
+std::map<std::string, QImage> instanceIconCache;
+
 ExplorerModel::ExplorerModel(InstanceRef dataRoot, QWidget *parent)
     : QAbstractItemModel(parent)
     , rootItem(dataRoot) {
@@ -96,11 +102,18 @@ int ExplorerModel::columnCount(const QModelIndex &parent) const {
 }
 
 QVariant ExplorerModel::data(const QModelIndex &index, int role) const {
-    if (!index.isValid() || role != Qt::DisplayRole)
+    if (!index.isValid())
         return {};
 
-    const Instance *item = static_cast<const Instance*>(index.internalPointer());
+    Instance *item = static_cast<Instance*>(index.internalPointer());
+
+    switch (role) {
+        case Qt::DisplayRole:
             return QString::fromStdString(item->name);
+        case Qt::DecorationRole:
+            return iconOf(item->GetClass());
+    }
+    return {};
 }
 
 QVariant ExplorerModel::headerData(int section, Qt::Orientation orientation,
@@ -114,3 +127,14 @@ Qt::ItemFlags ExplorerModel::flags(const QModelIndex &index) const
     return index.isValid()
         ? QAbstractItemModel::flags(index) : Qt::ItemFlags(Qt::NoItemFlags);
 }
+
+QImage ExplorerModel::iconOf(InstanceType* type) const {
+    if (instanceIconCache.count(type->className)) return instanceIconCache[type->className];
+
+    InstanceType* currentClass = type;
+    while (currentClass->explorerIcon.empty()) currentClass = currentClass->super;
+
+    QImage icon("assets/icons/" + QString::fromStdString(currentClass->explorerIcon));
+    instanceIconCache[type->className] = icon;
+    return icon;
+}

editor/explorermodel.h

@@ -30,6 +30,7 @@ public:
 private:
     InstanceRef rootItem;
     QModelIndex toIndex(InstanceRef item);
+    QImage iconOf(InstanceType* type) const;
 };
 
 #endif // EXPLORERMODEL_H

editor/mainwindow.cpp

@@ -28,6 +28,7 @@ MainWindow::MainWindow(QWidget *parent)
     setMouseTracking(true);
 
     ui->explorerView->setModel(new ExplorerModel(std::dynamic_pointer_cast<Instance>(workspace)));
+    ui->explorerView->setRootIsDecorated(false);
 
     simulationInit();
 

src/objects/base/instance.cpp

@@ -9,6 +9,7 @@ static InstanceType TYPE_ {
     .super = NULL,
     .className = "Instance",
     .constructor = NULL, // Instance is abstract and therefore not creatable
+    .explorerIcon = "instance",
 };
 
 InstanceType* Instance::TYPE = &TYPE_;

src/objects/base/instance.h

@@ -9,6 +9,7 @@ struct InstanceType {
     InstanceType* super; // May be null
     std::string className;
     InstanceConstructor constructor;
+    std::string explorerIcon = "";
 };
 
 // Base class for all instances in the data model

src/objects/part.cpp

@@ -5,6 +5,7 @@ static InstanceType TYPE_ {
     .super = Instance::TYPE,
     .className = "Part",
     .constructor = &Part::CreateGeneric,
+    .explorerIcon = "part",
 };
 
 InstanceType* Part::TYPE = &TYPE_;