revised UI color system when showing nodes

Olive now has a set of colors that categories can be "assigned" to. The timeline also shares the same colors as the NodeView. Colors can be configured per node (aka per clip).

app/node/node.cpp

@@ -27,15 +27,18 @@
 
 #include "common/timecodefunctions.h"
 #include "common/xmlutils.h"
+#include "config/config.h"
 #include "project/project.h"
 #include "project/item/footage/footage.h"
 #include "project/item/footage/videostream.h"
+#include "ui/colorcoding.h"
 #include "widget/nodeview/nodeviewundo.h"
 
 namespace olive {
 
 Node::Node() :
-  can_be_deleted_(true)
+  can_be_deleted_(true),
+  override_color_(-1)
 {
 }
 
@@ -99,6 +102,8 @@ void Node::Load(QXmlStreamReader *reader, XMLNodeData& xml_node_data, const QAto
       SetPosition(p);
     } else if (reader->name() == QStringLiteral("label")) {
       SetLabel(reader->readElementText());
+    } else if (reader->name() == QStringLiteral("color")) {
+      override_color_ = reader->readElementText().toInt();
     } else if (reader->name() == QStringLiteral("custom")) {
       LoadInternal(reader, xml_node_data);
     } else {
@@ -117,6 +122,7 @@ void Node::Save(QXmlStreamWriter *writer) const
   writer->writeEndElement(); // pos
 
   writer->writeTextElement(QStringLiteral("label"), GetLabel());
+  writer->writeTextElement(QStringLiteral("color"), QString::number(override_color_));
 
   foreach (NodeInput* input, inputs_) {
     writer->writeStartElement(QStringLiteral("input"));
@@ -146,6 +152,43 @@ void Node::Retranslate()
 {
 }
 
+Color Node::color() const
+{
+  int c;
+
+  if (override_color_ >= 0) {
+    c = override_color_;
+  } else {
+    c = Config::Current()[QStringLiteral("CatColor%1").arg(this->Category().first())].toInt();
+  }
+
+  return ColorCoding::GetColor(c);
+}
+
+QLinearGradient Node::gradient_color(qreal top, qreal bottom) const
+{
+  QLinearGradient grad;
+
+  grad.setStart(0, top);
+  grad.setFinalStop(0, bottom);
+
+  QColor c = color().toQColor();
+
+  grad.setColorAt(0.0, c.lighter());
+  grad.setColorAt(1.0, c);
+
+  return grad;
+}
+
+QBrush Node::brush(qreal top, qreal bottom) const
+{
+  if (Config::Current()[QStringLiteral("UseGradients")].toBool()) {
+    return gradient_color(top, bottom);
+  } else {
+    return color().toQColor();
+  }
+}
+
 void Node::RemoveNodesAndExclusiveDependencies(Node *node, QUndoCommand *command)
 {
   // Remove main node

app/node/node.h

@@ -154,6 +154,29 @@ public:
    */
   virtual void Retranslate();
 
+  /**
+   * @brief Retrieve the color of this node
+   */
+  Color color() const;
+
+  /**
+   * @brief Same as color() but return a pretty gradient version
+   */
+  QLinearGradient gradient_color(qreal top, qreal bottom) const;
+
+  /**
+   * @brief Uses config and returns either color() for flat shading or gradient for gradient
+   */
+  QBrush brush(qreal top, qreal bottom) const;
+
+  /**
+   * @brief Sets the override color. Set to -1 for no override color.
+   */
+  void SetOverrideColor(int index)
+  {
+    override_color_ = index;
+  }
+
   /**
    * @brief Return a list of NodeParams
    */
@@ -485,6 +508,11 @@ private:
    */
   QString label_;
 
+  /**
+   * @brief -1 if the color should be based on the category, >=0 if the user has set a custom color
+   */
+  int override_color_;
+
 };
 
 template<class T>