From 92467e21c65db93200ff62646e10400c653db6a0 Mon Sep 17 00:00:00 2001
From: zetaPRIME <qmanxt@gmail.com>
Date: Thu, 9 Mar 2017 14:34:59 -0500
Subject: [PATCH] DrawLayerProxy, rudimentary preview in OSK

---
 libstarlight/source/starlight/dialog/OSK.cpp  | 32 ++++++++++-----
 libstarlight/source/starlight/dialog/OSK.h    |  6 ++-
 .../starlight/dialog/osk/InputHandler.cpp     | 10 +++++
 .../starlight/dialog/osk/InputHandler.h       | 17 +++++++-
 .../source/starlight/ui/DrawLayerProxy.cpp    | 33 +++++++++++++++
 .../source/starlight/ui/DrawLayerProxy.h      | 40 +++++++++++++++++++
 libstarlight/todo.txt                         |  1 +
 themes/default/metrics.json                   |  7 ++++
 8 files changed, 135 insertions(+), 11 deletions(-)
 create mode 100644 libstarlight/source/starlight/ui/DrawLayerProxy.cpp
 create mode 100644 libstarlight/source/starlight/ui/DrawLayerProxy.h

diff --git a/libstarlight/source/starlight/dialog/OSK.cpp b/libstarlight/source/starlight/dialog/OSK.cpp
index cb5415f..7c3c1f8 100644
--- a/libstarlight/source/starlight/dialog/OSK.cpp
+++ b/libstarlight/source/starlight/dialog/OSK.cpp
@@ -2,6 +2,9 @@
 
 #include "starlight/ThemeManager.h"
 #include "starlight/InputManager.h"
+#include "starlight/GFXManager.h"
+
+#include "starlight/gfx/Font.h"
 
 #include "starlight/ui/Image.h"
 #include "starlight/ui/Button.h"
@@ -12,12 +15,17 @@
 
 using std::string;
 
+using starlight::ThemeManager;
 using starlight::InputManager;
+using starlight::GFXManager;
+
+using starlight::gfx::Font;
 
 using starlight::ui::Image;
 using starlight::ui::Button;
 using starlight::ui::Label;
 using starlight::ui::ScrollField;
+using starlight::ui::DrawLayerProxy;
 
 using starlight::ui::Form;
 
@@ -38,6 +46,7 @@ OSK::OSK(osk::InputHandler* handler) : Form(true), handler(handler) {
     
     auto actSym = [this](Button& key){
         this->handler->InputSymbol(key.label);
+        this->OnKey();
     };
     
     Vector2 bs(24, 32);
@@ -79,16 +88,19 @@ OSK::OSK(osk::InputHandler* handler) : Form(true), handler(handler) {
     auto key = std::make_shared<Button>(VRect(bpen, bs));
     key->rect.size.x *= 1.25;
     key->SetText("< <");
-    key->eOnTap = [this](auto& btn){ this->handler->Backspace(); };
+    key->eOnTap = [this](auto& btn){ this->handler->Backspace(); this->OnKey(); };
     touchScreen->Add(key);
     
+    // enter
     bpen = bpstart + bs * Vector2(linestart[4] + 8, 4);
     key = std::make_shared<Button>(VRect(bpen, bs));
     key->rect.size.x *= 2.5;
     key->SetText("Enter");
-    key->eOnTap = [this](auto& btn){ this->handler->Enter(); };
+    key->eOnTap = [this](auto& btn){ this->handler->Enter(); this->OnKey(); };
     touchScreen->Add(key);
     
+    preview = std::make_shared<DrawLayerProxy>(VRect::touchScreen.TopEdge(68).Expand(-2), [this](auto& layer){ this->DrawPreview(layer); }, true);
+    touchScreen->Add(preview);
 }
 
 void OSK::Update(bool focused) {
@@ -107,11 +119,13 @@ void OSK::Update(bool focused) {
     }
 }
 
-void OSK::OnSymKey(const string& chr) {
-    //pText->append(chr);
-    //pText->append("sackboy ");
-    //auto& tx = *pText;
-    //ConfigManager::Get("user").Json()["log"].push_back(*pText);
-    //tx.assign("shickaxe");
-    //if (eOnModify) eOnModify();
+void OSK::OnKey() {
+    preview->Refresh();
+}
+
+void OSK::DrawPreview(DrawLayerProxy& layer) {
+    if (true || handler->showPreview) {
+        static auto tc = ThemeManager::GetMetric<TextConfig>("/dialogs/OSK/preview");
+        tc.Print(layer.rect, handler->GetPreviewText(), Vector2::zero);
+    }
 }
diff --git a/libstarlight/source/starlight/dialog/OSK.h b/libstarlight/source/starlight/dialog/OSK.h
index 3b8e9c2..fd7630d 100644
--- a/libstarlight/source/starlight/dialog/OSK.h
+++ b/libstarlight/source/starlight/dialog/OSK.h
@@ -6,6 +6,7 @@
 #include <memory>
 
 #include "starlight/ui/Form.h"
+#include "starlight/ui/DrawLayerProxy.h"
 
 #include "starlight/dialog/osk/InputHandler.h"
 
@@ -14,6 +15,7 @@ namespace starlight {
         class OSK : public ui::Form, public ui::FormCreator<OSK> {
         private:
             std::shared_ptr<ui::UIContainer> setContainer;
+            std::shared_ptr<ui::DrawLayerProxy> preview;
         
         public:
             std::unique_ptr<osk::InputHandler> handler;
@@ -23,7 +25,9 @@ namespace starlight {
             
             void Update(bool focused) override;
             
-            void OnSymKey(const std::string& chr);
+            void OnKey();
+            
+            void DrawPreview(ui::DrawLayerProxy& layer);
         };
     }
 }
diff --git a/libstarlight/source/starlight/dialog/osk/InputHandler.cpp b/libstarlight/source/starlight/dialog/osk/InputHandler.cpp
index 1e86768..8c06136 100644
--- a/libstarlight/source/starlight/dialog/osk/InputHandler.cpp
+++ b/libstarlight/source/starlight/dialog/osk/InputHandler.cpp
@@ -10,6 +10,11 @@ using starlight::dialog::osk::InputHandlerBuffered;
 
 // DirectEdit
 
+std::string& InputHandlerDirectEdit::GetPreviewText() { return *pText; }
+
+unsigned int InputHandlerDirectEdit::GetCursor() { return pText->length(); }
+void InputHandlerDirectEdit::SetCursor(unsigned int index) { }
+
 void InputHandlerDirectEdit::InputSymbol(const string& sym) {
     pText->append(sym);
     if (eOnModify) eOnModify();
@@ -34,6 +39,11 @@ void InputHandlerDirectEdit::Done() {
 
 // Buffered
 
+std::string& InputHandlerBuffered::GetPreviewText() { return buffer; }
+
+unsigned int InputHandlerBuffered::GetCursor() { return buffer.length(); }
+void InputHandlerBuffered::SetCursor(unsigned int index) { }
+
 void InputHandlerBuffered::InputSymbol(const string& sym) {
     buffer.append(sym);
 }
diff --git a/libstarlight/source/starlight/dialog/osk/InputHandler.h b/libstarlight/source/starlight/dialog/osk/InputHandler.h
index a06e415..40d8e83 100644
--- a/libstarlight/source/starlight/dialog/osk/InputHandler.h
+++ b/libstarlight/source/starlight/dialog/osk/InputHandler.h
@@ -21,6 +21,11 @@ namespace starlight {
                 InputHandler() = default;
                 virtual ~InputHandler() = default;
                 
+                virtual std::string& GetPreviewText() { static std::string p = ""; return p; }
+                
+                virtual unsigned int GetCursor() { return 0; }
+                virtual void SetCursor(unsigned int index) { }
+                
                 virtual void InputSymbol(const std::string& sym) { }
                 virtual void Backspace() { }
                 virtual void Enter() { }
@@ -42,6 +47,11 @@ namespace starlight {
                     : multiLine(multiLine), pText(textptr), minIndex(minIndex), eOnModify(onModify), eOnFinalize(onFinalize) { }
                 ~InputHandlerDirectEdit() override { }
                 
+                std::string& GetPreviewText() override;
+                
+                unsigned int GetCursor() override;
+                void SetCursor(unsigned int index) override;
+                
                 void InputSymbol(const std::string& sym) override;
                 void Backspace() override;
                 void Enter() override;
@@ -57,9 +67,14 @@ namespace starlight {
                 std::function<void(const std::string&)> eOnFinalize = { };
                 
                 InputHandlerBuffered(const std::string& text = "", bool multiLine = false, std::function<void(const std::string&)> onFinalize = {})
-                    : showPreview(true), buffer(text), multiLine(multiLine), eOnFinalize(onFinalize) { }
+                    : buffer(text), multiLine(multiLine), eOnFinalize(onFinalize) { this->showPreview = true; }
                 ~InputHandlerBuffered() override { }
                 
+                std::string& GetPreviewText() override;
+                
+                unsigned int GetCursor() override;
+                void SetCursor(unsigned int index) override;
+                
                 void InputSymbol(const std::string& sym) override;
                 void Backspace() override;
                 void Enter() override;
diff --git a/libstarlight/source/starlight/ui/DrawLayerProxy.cpp b/libstarlight/source/starlight/ui/DrawLayerProxy.cpp
new file mode 100644
index 0000000..9a1ce0f
--- /dev/null
+++ b/libstarlight/source/starlight/ui/DrawLayerProxy.cpp
@@ -0,0 +1,33 @@
+#include "DrawLayerProxy.h"
+
+#include "starlight/GFXManager.h"
+
+using starlight::GFXManager;
+using starlight::gfx::DrawContextCanvas;
+
+using starlight::ui::DrawLayerProxy;
+
+void DrawLayerProxy::Refresh() {
+    canvas.reset();
+    MarkForRedraw();
+}
+
+void DrawLayerProxy::PreDraw() {
+    if (useCanvas) {
+        if (!canvas) {
+            canvas = std::make_unique<DrawContextCanvas>(rect.size);
+            canvas->Clear();
+            GFXManager::PushContext(canvas.get());
+            if (eDraw) eDraw(*this);
+            GFXManager::PopContext();
+        }
+    } else canvas.reset();
+}
+
+void DrawLayerProxy::Draw() {
+    if (canvas) {
+        canvas->Draw(VRect(rect.pos, canvas->rect.size));
+    } else {
+        if (eDraw) eDraw(*this);
+    }
+}
diff --git a/libstarlight/source/starlight/ui/DrawLayerProxy.h b/libstarlight/source/starlight/ui/DrawLayerProxy.h
new file mode 100644
index 0000000..88235b7
--- /dev/null
+++ b/libstarlight/source/starlight/ui/DrawLayerProxy.h
@@ -0,0 +1,40 @@
+#pragma once
+#include "starlight/_global.h"
+
+#include <memory>
+#include <functional>
+
+#include "starlight/datatypes/Vector2.h"
+#include "starlight/datatypes/VRect.h"
+
+#include "starlight/gfx/DrawContextCanvas.h"
+
+#include "starlight/ui/UIElement.h"
+
+namespace starlight {
+    namespace ui {
+        class DrawLayerProxy : public UIElement {
+        private:
+            
+        protected:
+            
+        public:
+            bool useCanvas = false;
+            
+            std::unique_ptr<gfx::DrawContextCanvas> canvas;
+            
+            std::function<void(DrawLayerProxy&)> eDraw;
+            
+            DrawLayerProxy(VRect rect, std::function<void(DrawLayerProxy&)> drawFunc, bool useCanvas = false) : useCanvas(useCanvas), eDraw(drawFunc) { this->rect = rect; }
+            ~DrawLayerProxy() override { }
+            
+            void Refresh();
+            
+            //void Update() override;
+            void PreDraw() override;
+            void Draw() override;
+            
+            //
+        };
+    }
+}
diff --git a/libstarlight/todo.txt b/libstarlight/todo.txt
index f461743..5e3b8e5 100644
--- a/libstarlight/todo.txt
+++ b/libstarlight/todo.txt
@@ -11,6 +11,7 @@ roadmap to first release, in no particular order {
         InputManager::OpenKeyboard
     }
     textbox widget
+    - "draw proxy" UIElement (takes a std::function for draw operation)
     
     add license!! (MIT?)
     ADD README.MD PLS
diff --git a/themes/default/metrics.json b/themes/default/metrics.json
index b851bab..830f33f 100644
--- a/themes/default/metrics.json
+++ b/themes/default/metrics.json
@@ -32,6 +32,13 @@
     "dialogs" : {
         "messageBox" : {
             "size" : [240, 160]
+        },
+        "OSK" : {
+            "preview" : {
+                "font" : "default.16",
+                "textColor" : "white",
+                "borderColor" : "black"
+            }
         }
     },