Add Reposition and Resize events.

include/event.hpp

@@ -241,6 +241,18 @@ struct Zoom : Event {
 };
 
 
+/** Occurs when Widget::setPos() is called.
+*/
+struct Reposition : Event {
+};
+
+
+/** Occurs when Widget::setSize() is called.
+*/
+struct Resize : Event {
+};
+
+
 struct State {
 	widget::Widget *rootWidget = NULL;
 	/** State widgets

include/widget/Widget.hpp

@@ -32,6 +32,9 @@ struct Widget {
 
 	virtual ~Widget();
 
+	void setPos(math::Vec pos);
+	void setSize(math::Vec size);
+
 	virtual math::Rect getChildrenBoundingBox();
 	/**  Returns `v` transformed into the coordinate system of `relative` */
 	virtual math::Vec getRelativeOffset(math::Vec v, Widget *relative);
@@ -143,6 +146,8 @@ struct Widget {
 	virtual void onAction(const event::Action &e) {}
 	virtual void onChange(const event::Change &e) {}
 	virtual void onZoom(const event::Zoom &e) {recurseEvent(&Widget::onZoom, e);}
+	virtual void onReposition(const event::Reposition &e) {}
+	virtual void onResize(const event::Resize &e) {}
 };
 
 

src/app/ModuleBrowser.cpp

@@ -27,7 +27,9 @@ static std::set<plugin::Model*> sFavoriteModels;
 struct BrowserOverlay : widget::OpaqueWidget {
 	void step() override {
 		box = parent->box.zeroPos();
-		widget::OpaqueWidget::step();
+		// Only step if visible, since there are potentially thousands of descendants that don't need to be stepped.
+		if (visible)
+			widget::OpaqueWidget::step();
 	}
 
 	void onButton(const event::Button &e) override {

src/widget/Widget.cpp

@@ -14,6 +14,18 @@ Widget::~Widget() {
 	clearChildren();
 }
 
+void Widget::setPos(math::Vec pos) {
+	box.pos = pos;
+	event::Reposition eReposition;
+	onReposition(eReposition);
+}
+
+void Widget::setSize(math::Vec size) {
+	box.size = size;
+	event::Resize eResize;
+	onResize(eResize);
+}
+
 math::Rect Widget::getChildrenBoundingBox() {
 	math::Vec min = math::Vec(INFINITY, INFINITY);
 	math::Vec max = math::Vec(-INFINITY, -INFINITY);