Convert visual layers to scene nodes.

src/ui_elements/widgets/Widget.cpp

@@ -4,9 +4,11 @@
 #include "MouseEvent.h"
 #include "KeyboardEvent.h"
 #include "PaintEvent.h"
-#include "VisualLayer.h"
+
+#include "AbstractVisualNode.h"
 #include "TextNode.h"
-#include "Color.h"
+#include "TransformNode.h"
+#include "RootNode.h"
 
 #include <algorithm>
 #include <iterator>
@@ -17,8 +19,7 @@ Widget::Widget()
       mSize({100, 0, 0, 100, 0, 0}),
       mPadding(),
       mMargin(),
-      mMyLayers(),
-      mLayers(),
+      mRootNode(std::make_unique<TransformNode>()),
       mChildren(),
       mBorderThickness(0),
       mBackgroundColor(Color(255, 255, 255)),
@@ -40,6 +41,7 @@ std::unique_ptr<Widget> Widget::Create()
 
 void Widget::addWidget(WidgetUPtr widget)
 {
+    mPendingChildNodes.push_back(widget->getRootNode());
     mChildren.push_back(std::move(widget));
 }
 
@@ -53,9 +55,9 @@ const DiscretePoint& Widget::getLocation() const
     return mLocation;
 }
 
-std::vector<VisualLayer*> Widget::getLayers() const
+TransformNode* Widget::getRootNode() const
 {
-    return mLayers;
+    return mRootNode.get();
 }
 
 void Widget::setSize(const BoundedSize& size)
@@ -63,7 +65,7 @@ void Widget::setSize(const BoundedSize& size)
     if (size != mSize)
     {
         mSize = size;
-        mDirty = true;
+        mTransformDirty = true;
     }
 }
 
@@ -77,7 +79,7 @@ void Widget::setMargin(const BoundaryOffset& margin)
     if (margin != mMargin)
     {
         mMargin = margin;
-        mDirty = true;
+        mTransformDirty = true;
     }
 }
 
@@ -91,7 +93,7 @@ void Widget::setPadding(const BoundaryOffset& padding)
     if (padding != mPadding)
     {
         mPadding = padding;
-        mDirty = true;
+        mTransformDirty = true;
     }
 }
 
@@ -99,7 +101,7 @@ void Widget::setBounds(unsigned width, unsigned height)
 {
     if (width != mSize.mWidth || height != mSize.mHeight)
     {
-        mDirty = true;
+        mTransformDirty = true;
         mSize.mWidth = width;
         mSize.mHeight = height;
     }
@@ -110,7 +112,7 @@ void Widget::setBackgroundColor(const Color& color)
     if (mBackgroundColor != color)
     {
         mBackgroundColor = std::move(color);
-        mDirty = true;
+        mMaterialDirty = true;
     }
 }
 
@@ -119,7 +121,7 @@ void Widget::setLocation(const DiscretePoint& loc)
     if (mLocation != loc)
     {
         mLocation = loc;
-        mDirty = true;
+        mTransformDirty = true;
     }
 }
 
@@ -127,35 +129,19 @@ void Widget::setVisible(bool visible)
 {
     if (mVisible != visible)
     {
-        mDirty = true;
+        mVisibilityDirty = true;
     }
     mVisible = visible;
-
 }
 
-void Widget::addMyLayers()
+bool Widget::isDirty() const
 {
-    mLayers.clear();
-    mLayers.reserve(mMyLayers.size());
-    auto getRaw = [](const VisualLayerUPtr& uptr){return uptr.get();};
-    std::transform(mMyLayers.begin(), mMyLayers.end(), std::back_inserter(mLayers), getRaw);
-}
-
-void Widget::addChildLayers(const PaintEvent* event)
-{
-    for(auto& child: mChildren)
-    {
-        child->setBounds(mSize.mWidth, mSize.mHeight);
-        child->setLocation(mLocation);
-        child->onPaintEvent(event);
-        const auto layers = child->getLayers();
-        mLayers.insert(mLayers.end(), layers.begin(), layers.end());
-    }
+    return mTransformDirty || mMaterialDirty || mVisibilityDirty || mPendingChildNodes.size() > 0;
 }
 
 bool Widget::needsUpdate() const
 {
-    if (mDirty)
+    if (isDirty())
     {
         return true;
     }
@@ -169,26 +155,48 @@ bool Widget::needsUpdate() const
     return false;
 }
 
+void Widget::doPaint(const PaintEvent* event)
+{
+    updateBackground(event);
+}
+
 void Widget::onPaintEvent(const PaintEvent* event)
 {
     if (!needsUpdate())
     {
         return;
     }
-    mLayers.clear();
 
-    if (mDirty)
+    if (isDirty())
     {
-        mMyLayers.clear();
-        if(!mVisible)
-        {
-            return;
-        }
-        addBackground(event);
-        mDirty = false;
+        doPaint(event);
+
+        mTransformDirty = false;
+        mMaterialDirty = false;
+        mVisibilityDirty = false;
+    }
+
+    for (auto node : mPendingChildNodes)
+    {
+        mRootNode->addChild(node);
+    }
+    mPendingChildNodes.clear();
+
+    updateChildLocations();
+
+    for(auto& child: mChildren)
+    {
+        child->onPaintEvent(event);
+    }
+}
+
+void Widget::updateChildLocations()
+{
+    for(auto& child: mChildren)
+    {
+        child->setBounds(mSize.mWidth, mSize.mHeight);
+        child->setLocation(mLocation);
     }
-    addMyLayers();
-    addChildLayers(event);
 }
 
 bool Widget::contains(const DiscretePoint& loc) const
@@ -267,16 +275,32 @@ void Widget::onMyMouseEvent(const MouseEvent* event)
 
 }
 
-void Widget::addBackground(const PaintEvent* event)
+void Widget::updateBackground(const PaintEvent* event)
 {
     unsigned locX = mLocation.GetX() + mMargin.mLeft;
     unsigned locY = mLocation.GetY() + mMargin.mTop;
     unsigned deltaX = mSize.mWidth - mMargin.mLeft - mMargin.mRight;
     unsigned deltaY = mSize.mHeight - mMargin.mTop - mMargin.mBottom;
 
-    auto node = RectangleNode::Create(DiscretePoint(locX, locY), deltaX, deltaY);
-    node->setFillColor(mBackgroundColor);
-    auto layer = VisualLayer::Create();
-    layer->setShapeNode(std::move(node));
-    mMyLayers.push_back(std::move(layer));
+    if (!mBackgroundNode)
+    {
+        mRootNode->addChild(mBackgroundNode.get());
+    }
+
+    if (mTransformDirty)
+    {
+        mBackgroundNode->setWidth(deltaX);
+        mBackgroundNode->setHeight(deltaY);
+        mBackgroundNode->setLocation(DiscretePoint(locX, locY));
+    }
+
+    if (mMaterialDirty)
+    {
+        mBackgroundNode->setFillColor(mBackgroundColor);
+    }
+
+    if (mVisibilityDirty)
+    {
+        mBackgroundNode->setIsVisible(mVisible);
+    }
 }