From a21f201cc0dd56ac260df01f1d73c66842691aab Mon Sep 17 00:00:00 2001
From: Romain Goyet <romain.goyet@numworks.com>
Date: Tue, 12 Apr 2016 18:47:36 +0200
Subject: [PATCH] Escher: Adding a GUI toolkit

Change-Id: I9c78cc1afdd35968110484c3e3782c866b88c671
---
 Makefile                                 |  1 +
 escher/Makefile                          |  6 ++
 escher/include/escher.h                  |  7 +++
 escher/include/escher/solid_color_view.h | 14 +++++
 escher/include/escher/view.h             | 31 ++++++++++
 escher/src/solid_color_view.cpp          | 11 ++++
 escher/src/view.cpp                      | 76 ++++++++++++++++++++++++
 7 files changed, 146 insertions(+)
 create mode 100644 escher/Makefile
 create mode 100644 escher/include/escher.h
 create mode 100644 escher/include/escher/solid_color_view.h
 create mode 100644 escher/include/escher/view.h
 create mode 100644 escher/src/solid_color_view.cpp
 create mode 100644 escher/src/view.cpp

diff --git a/Makefile b/Makefile
index ae0bbf86a..4e8011a04 100644
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,7 @@ endif
 include ion/Makefile
 include kandinsky/Makefile
 include poincare/Makefile
+include escher/Makefile
 include app/Makefile
 include quiz/Makefile # Quiz should be included at the end
 
diff --git a/escher/Makefile b/escher/Makefile
new file mode 100644
index 000000000..b6be880c4
--- /dev/null
+++ b/escher/Makefile
@@ -0,0 +1,6 @@
+SFLAGS += -Iescher/include
+
+objs += $(addprefix escher/src/,\
+  solid_color_view.o\
+  view.o\
+)
diff --git a/escher/include/escher.h b/escher/include/escher.h
new file mode 100644
index 000000000..125bcbe12
--- /dev/null
+++ b/escher/include/escher.h
@@ -0,0 +1,7 @@
+#ifndef ESCHER_H
+#define ESCHER_H
+
+#include <escher/solid_color_view.h>
+#include <escher/view.h>
+
+#endif
diff --git a/escher/include/escher/solid_color_view.h b/escher/include/escher/solid_color_view.h
new file mode 100644
index 000000000..03d63b5c2
--- /dev/null
+++ b/escher/include/escher/solid_color_view.h
@@ -0,0 +1,14 @@
+#ifndef ESCHER_SOLID_COLOR_VIEW_H
+#define ESCHER_SOLID_COLOR_VIEW_H
+
+#include <escher/view.h>
+
+class SolidColorView : public View {
+public:
+  SolidColorView(KDRect frame, KDColor color);
+  void drawRect(KDRect rect) override;
+private:
+  KDColor m_color;
+};
+
+#endif
diff --git a/escher/include/escher/view.h b/escher/include/escher/view.h
new file mode 100644
index 000000000..f4e88714b
--- /dev/null
+++ b/escher/include/escher/view.h
@@ -0,0 +1,31 @@
+#ifndef ESCHER_VIEW_H
+#define ESCHER_VIEW_H
+
+extern "C" {
+#include <stdint.h>
+#include <kandinsky.h>
+}
+
+class View {
+public:
+  View(KDRect frame);
+  ~View();
+  void draw();
+  virtual void drawRect(KDRect rect);
+  void addSubview(View * subview);
+  void removeFromSuperview();
+  void setFrame(KDRect frame);
+protected:
+  KDRect bounds();
+private:
+  void setOriginAndDrawRect(KDRect rect);
+  KDPoint absoluteOrigin();
+  //TODO: We may want a dynamic size at some point
+  static constexpr uint8_t k_maxNumberOfSubviews = 4;
+  KDRect m_frame;
+  View * m_superview;
+  View * m_subviews[k_maxNumberOfSubviews];
+  uint8_t m_numberOfSubviews;
+};
+
+#endif
diff --git a/escher/src/solid_color_view.cpp b/escher/src/solid_color_view.cpp
new file mode 100644
index 000000000..291ad3862
--- /dev/null
+++ b/escher/src/solid_color_view.cpp
@@ -0,0 +1,11 @@
+#include <escher/solid_color_view.h>
+
+SolidColorView::SolidColorView(KDRect frame, KDColor color) :
+  View(frame),
+  m_color(color)
+{
+}
+
+void SolidColorView::drawRect(KDRect rect) {
+  KDFillRect(rect, m_color);
+}
diff --git a/escher/src/view.cpp b/escher/src/view.cpp
new file mode 100644
index 000000000..0088160af
--- /dev/null
+++ b/escher/src/view.cpp
@@ -0,0 +1,76 @@
+extern "C" {
+#include <assert.h>
+}
+#include <escher/view.h>
+
+View::View(KDRect frame) :
+  m_frame(frame),
+  m_superview(nullptr),
+  m_numberOfSubviews(0)
+{
+}
+
+View::~View() {
+}
+
+void View::drawRect(KDRect rect) {
+}
+
+void View::draw() {
+  setOriginAndDrawRect(m_frame);
+  for (uint8_t i=0; i<m_numberOfSubviews; i++) {
+    View * subview = m_subviews[i];
+    subview->draw();
+  }
+}
+
+void View::addSubview(View * subview) {
+  assert(m_numberOfSubviews < k_maxNumberOfSubviews);
+  subview->m_superview = this;
+  m_subviews[m_numberOfSubviews++] = subview;
+}
+
+void View::removeFromSuperview() {
+  assert(m_superview != nullptr);
+  assert(false); // FIXME: Unimplemented
+}
+
+void View::setFrame(KDRect frame) {
+ // TODO: Return if frame is equal to m_frame
+ if (m_superview != nullptr) {
+   // We're moving this view
+   // So let's ask its superview to redraw itself where that view previously was
+   m_superview->setOriginAndDrawRect(m_frame);
+ }
+ m_frame = frame;
+ if (m_superview != nullptr) {
+   // We've been moved
+   // Draw ourself at the new location
+   setOriginAndDrawRect(bounds());
+ }
+}
+
+KDRect View::bounds() {
+  KDRect bounds = m_frame;
+  bounds.x = 0;
+  bounds.y = 0;
+  return bounds;
+}
+
+void View::setOriginAndDrawRect(KDRect rect) {
+  KDSetOrigin(absoluteOrigin());
+  this->drawRect(rect);
+}
+
+KDPoint View::absoluteOrigin() {
+  if (m_superview == nullptr) {
+    return m_frame.origin;
+  } else {
+    KDPoint parentOrigin = m_superview->absoluteOrigin();
+    KDPoint myOrigin = m_frame.origin;
+    KDPoint result;
+    result.x = parentOrigin.x + myOrigin.x;
+    result.y = parentOrigin.y + myOrigin.y;
+    return result;
+  }
+}