--- /dev/null
+package net.mograsim.logic.ui.model;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Consumer;
+
+import net.mograsim.logic.ui.model.components.GUIComponent;
+import net.mograsim.logic.ui.model.wires.GUIWire;
+
+public class ViewModel
+{
+ private final List<GUIComponent> components;
+ private final List<GUIComponent> componentsUnmodifiable;
+ private final List<GUIWire> wires;
+ private final List<GUIWire> wiresUnmodifiable;
+
+ private final List<Consumer<? super GUIComponent>> componentAddedListeners;
+ private final List<Consumer<? super GUIComponent>> componentRemovedListeners;
+ private final List<Consumer<? super GUIWire>> wireAddedListeners;
+ private final List<Consumer<? super GUIWire>> wireRemovedListeners;
+
+ public ViewModel()
+ {
+ components = new ArrayList<>();
+ componentsUnmodifiable = Collections.unmodifiableList(components);
+ wires = new ArrayList<>();
+ wiresUnmodifiable = Collections.unmodifiableList(wires);
+
+ componentAddedListeners = new ArrayList<>();
+ componentRemovedListeners = new ArrayList<>();
+ wireAddedListeners = new ArrayList<>();
+ wireRemovedListeners = new ArrayList<>();
+ }
+
+ /**
+ * Adds the given component to the list of components and calls all componentAddedListeners. Don't call this method from application
+ * code as it is automatically called in GUIComponent::new.
+ */
+ public void componentCreated(GUIComponent component)
+ {
+ if (components.contains(component))
+ throw new IllegalStateException("Don't add the same component twice!");
+ components.add(component);
+ callComponentAddedListeners(component);
+ }
+
+ /**
+ * Removes the given component from the list of components and calls all componentRemovedListeners. Don't call this method from
+ * application code as it is automatically called in GUIComponent::destroy.
+ */
+ public void componentDestroyed(GUIComponent component)
+ {
+ if (!components.contains(component))
+ throw new IllegalStateException("Don't remove the same component twice!");
+ components.remove(component);
+ callComponentRemovedListeners(component);
+ }
+
+ /**
+ * Adds the given component to the list of components and calls all componentAddedListeners. Don't call this method from application
+ * code as it is automatically called in GUIComponent::new.
+ */
+ public void wireCreated(GUIWire wire)
+ {
+ if (wires.contains(wire))
+ throw new IllegalStateException("Don't add the same wire twice!");
+ wires.add(wire);
+ callWireAddedListeners(wire);
+ }
+
+ /**
+ * Removes the given component from the list of components and calls all componentRemovedListeners. Don't call this method from
+ * application code as it is automatically called in GUIComponent::destroy.
+ */
+ public void wireDestroyed(GUIWire wire)
+ {
+ if (!wires.contains(wire))
+ throw new IllegalStateException("Don't remove the same wire twice!");
+ wires.remove(wire);
+ callWireRemovedListeners(wire);
+ }
+
+ public List<GUIComponent> getComponents()
+ {
+ return componentsUnmodifiable;
+ }
+
+ public List<GUIWire> getWires()
+ {
+ return wiresUnmodifiable;
+ }
+
+ // @formatter:off
+ public void addComponentAddedListener (Consumer<? super GUIComponent> listener){componentAddedListeners .add (listener);}
+ public void addComponentRemovedListener (Consumer<? super GUIComponent> listener){componentRemovedListeners.add (listener);}
+ public void addWireAddedListener (Consumer<? super GUIWire > listener){wireAddedListeners .add (listener);}
+ public void addWireRemovedListener (Consumer<? super GUIWire > listener){wireRemovedListeners .add (listener);}
+
+ public void removeComponentAddedListener (Consumer<? super GUIComponent> listener){componentAddedListeners .remove(listener);}
+ public void removeComponentRemovedListener(Consumer<? super GUIComponent> listener){componentRemovedListeners.remove(listener);}
+ public void removeWireAddedListener (Consumer<? super GUIWire > listener){wireAddedListeners .remove(listener);}
+ public void removeWireRemovedListener (Consumer<? super GUIWire > listener){wireRemovedListeners .remove(listener);}
+
+ private void callComponentAddedListeners (GUIComponent c) {componentAddedListeners .forEach(l -> l.accept(c));}
+ private void callComponentRemovedListeners(GUIComponent c) {componentRemovedListeners.forEach(l -> l.accept(c));}
+ private void callWireAddedListeners (GUIWire w ) {wireAddedListeners .forEach(l -> l.accept(w));}
+ private void callWireRemovedListeners (GUIWire w ) {wireRemovedListeners .forEach(l -> l.accept(w));}
+ // @formatter:on
+}
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