implemented bulk of curve editor's functionality

While certainly not entirely complete yet, this implements most of the UI
functionality of the graph editor.

app/widget/curvewidget/curvewidget.h

@@ -1,25 +1,72 @@
 #ifndef CURVEWIDGET_H
 #define CURVEWIDGET_H
 
+#include <QHBoxLayout>
 #include <QPushButton>
 #include <QWidget>
 
 #include "curveview.h"
+#include "node/input.h"
+#include "widget/nodeparamview/nodeparamviewwidgetbridge.h"
+#include "widget/timeruler/timeruler.h"
 
 class CurveWidget : public QWidget
 {
+  Q_OBJECT
 public:
   CurveWidget(QWidget* parent = nullptr);
 
+  virtual ~CurveWidget() override;
+
+  void SetInput(NodeInput* input);
+
+  void SetTimebase(const rational& timebase);
+
+  void SetTime(const int64_t& timestamp);
+
+  const double& GetScale();
+  void SetScale(const double& scale);
+
+signals:
+  void TimeChanged(const int64_t& timestamp);
+
+protected:
+  virtual void changeEvent(QEvent *) override;
+
 private:
+  void UpdateInputLabel();
+
+  void SetKeyframeButtonEnabled(bool enable);
+
+  void SetKeyframeButtonChecked(bool checked);
+
+  void SetKeyframeButtonCheckedFromType(NodeKeyframe::Type type);
+
   QPushButton* linear_button_;
 
   QPushButton* bezier_button_;
 
   QPushButton* hold_button_;
 
+  TimeRuler* ruler_;
+
   CurveView* view_;
 
+  NodeInput* input_;
+
+  QLabel* input_label_;
+
+  QHBoxLayout* widget_bridge_layout_;
+
+  NodeParamViewWidgetBridge* bridge_;
+
+private slots:
+  void UpdateBridgeTime(const int64_t& timestamp);
+
+  void SelectionChanged();
+
+  void KeyframeTypeButtonTriggered(bool checked);
+
 };
 
 #endif // CURVEWIDGET_H