began node viewer for dag insight

app/widget/nodeview/nodeviewitem.cpp

@@ -20,41 +20,66 @@
 
 #include "nodeviewitem.h"
 
-#include <QApplication>
-#include <QBrush>
 #include <QFontMetrics>
 #include <QPainter>
-#include <QPen>
 #include <QStyleOptionGraphicsItem>
 
+#include "ui/icons/icons.h"
+
 const int kNodeViewItemBorderWidth = 2;
 const int kNodeViewItemWidth = 250;
-const int kNodeViewItemPadding = 5;
+const int kNodeViewItemTextPadding = 4;
+const int kNodeViewItemIconPadding = 12;
 
 NodeViewItem::NodeViewItem(QGraphicsItem *parent) :
   QGraphicsRectItem(parent),
   node_(nullptr)
 {
+  // Set flags for this widget
   setFlag(QGraphicsItem::ItemIsMovable);
   setFlag(QGraphicsItem::ItemIsSelectable);
 
+  // Use the current default font height to size this widget
   QFont f;
   QFontMetrics fm(f);
 
-  setRect(0, 0, kNodeViewItemWidth, fm.height() + kNodeViewItemPadding * 2);
+  setRect(0, 0, kNodeViewItemWidth, fm.height() + kNodeViewItemTextPadding * 2);
+
+  // FIXME: Magic "number"/magic "color" - allow this to be editable by the user
+  SetColor(QColor(32, 32, 128));
+}
+
+void NodeViewItem::SetColor(const QColor &color)
+{
+  color_ = color;
+
+  // Create a light gradient based on this color
+  UpdateGradient();
+
+  update();
+}
+
+void NodeViewItem::SetNode(Node *n)
+{
+  node_ = n;
+
+  update();
+}
+
+Node *NodeViewItem::node()
+{
+  return node_;
 }
 
 void NodeViewItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
-  Q_UNUSED(widget)
-
   // Set up border, which will change color if selected
   QPen pen;
 
   pen.setWidth(kNodeViewItemBorderWidth);
 
   if (option->state & QStyle::State_Selected) {
-    pen.setColor(qApp->palette().highlight().color());
+    pen.setColor(widget->palette().highlight().color());
   } else {
     // FIXME: Not configurable?
     pen.setColor(Qt::black);
@@ -62,16 +87,37 @@ void NodeViewItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *opti
 
   // Draw rect
   painter->setPen(pen);
-  painter->setBrush(qApp->palette().window());
+  painter->setBrush(brush());
   painter->drawRect(rect());
 
-
   // Draw text
   if (node_ != nullptr) {
-    painter->setPen(qApp->palette().text().color());
+    // FIXME: The text is always drawn white assuming the color will be dark - the intention is to provide preset
+    //        colors that will always be dark for the user to choose, so this value can stay white.
+    painter->setPen(Qt::white);
 
+    // Draw the expand icon
+    QRectF icon_rect = rect();
+    icon_rect.adjust(kNodeViewItemIconPadding,
+                     kNodeViewItemIconPadding,
+                     -kNodeViewItemIconPadding,
+                     -kNodeViewItemIconPadding);
+    olive::icon::TriRight.paint(painter, icon_rect.toRect(), Qt::AlignLeft | Qt::AlignVCenter);
+
+    // Draw the text in a rect (the rect is sized around text already in the constructor)
     QRectF text_rect = rect();
-    text_rect.adjust(kNodeViewItemPadding, kNodeViewItemPadding, -kNodeViewItemPadding, -kNodeViewItemPadding);
+    text_rect.adjust(kNodeViewItemIconPadding + icon_rect.height() + kNodeViewItemTextPadding,
+                     kNodeViewItemTextPadding,
+                     -kNodeViewItemTextPadding,
+                     -kNodeViewItemTextPadding);
     painter->drawText(text_rect, Qt::AlignTop | Qt::AlignLeft, node_->Name());
   }
 }
+
+void NodeViewItem::UpdateGradient()
+{
+  QLinearGradient grad(QPointF(0, rect().top()), QPointF(0, rect().bottom()));
+  grad.setColorAt(0, color_.lighter(175));
+  grad.setColorAt(1, color_);
+  setBrush(grad);
+}