From a465a23bdccff1680f056f61b321be717627601e Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sat, 10 Nov 2018 20:36:02 +0800
Subject: Add foreground/background support.

---
 src/ui/control.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++------------
 src/ui/control.hpp |  8 ++++++--
 2 files changed, 48 insertions(+), 14 deletions(-)

(limited to 'src')

diff --git a/src/ui/control.cpp b/src/ui/control.cpp
index 63d322b3..5d15e287 100644
--- a/src/ui/control.cpp
+++ b/src/ui/control.cpp
@@ -202,16 +202,7 @@ namespace cru::ui
         const auto position = GetPositionRelative();
         device_context->SetTransform(old_transform * D2D1::Matrix3x2F::Translation(position.x, position.y));
 
-        OnDraw(device_context);
-
-        const auto rect = GetRect(RectRange::Content);
-        graph::WithTransform(device_context, D2D1::Matrix3x2F::Translation(rect.left, rect.top),
-            [this](ID2D1DeviceContext* device_context)
-            {
-                OnDrawContent(device_context);
-                DrawEventArgs args(this, this, device_context);
-                draw_event.Raise(args);
-            });
+        OnDrawCore(device_context);
 
         for (auto child : GetChildren())
             child->Draw(device_context);
@@ -385,14 +376,15 @@ namespace cru::ui
         window_ = nullptr;
     }
 
+    
     inline D2D1_RECT_F Convert(const Rect& rect)
     {
         return D2D1::RectF(rect.left, rect.top, rect.left + rect.width, rect.top + rect.height);
     }
 
-    void Control::OnDraw(ID2D1DeviceContext* device_context)
+    void Control::OnDrawCore(ID2D1DeviceContext* device_context)
     {
-#ifdef CRU_DEBUG_LAYOUT
+        #ifdef CRU_DEBUG_LAYOUT
         if (GetWindow()->IsDebugLayout())
         {
             if (padding_geometry_ != nullptr)
@@ -417,6 +409,34 @@ namespace cru::ui
                 GetBorderProperty().GetStrokeStyle().Get()
             );
         }
+
+        //draw background.
+        const auto padding_rect = GetRect(RectRange::Padding);
+        graph::WithTransform(device_context, D2D1::Matrix3x2F::Translation(padding_rect.left, padding_rect.top),
+            [this](ID2D1DeviceContext* device_context)
+            {
+                OnDrawBackground(device_context);
+                DrawEventArgs args(this, this, device_context);
+                draw_background_event.Raise(args);
+            });
+
+
+        const auto rect = GetRect(RectRange::Content);
+        graph::WithTransform(device_context, D2D1::Matrix3x2F::Translation(rect.left, rect.top),
+            [this](ID2D1DeviceContext* device_context)
+            {
+                OnDrawContent(device_context);
+                DrawEventArgs args(this, this, device_context);
+                draw_content_event.Raise(args);
+            });
+
+        graph::WithTransform(device_context, D2D1::Matrix3x2F::Translation(padding_rect.left, padding_rect.top),
+            [this](ID2D1DeviceContext* device_context)
+            {
+                OnDrawForeground(device_context);
+                DrawEventArgs args(this, this, device_context);
+                draw_foreground_event.Raise(args);
+            });
     }
 
     void Control::OnDrawContent(ID2D1DeviceContext * device_context)
@@ -424,6 +444,16 @@ namespace cru::ui
 
     }
 
+    void Control::OnDrawForeground(ID2D1DeviceContext* device_context)
+    {
+
+    }
+
+    void Control::OnDrawBackground(ID2D1DeviceContext* device_context)
+    {
+
+    }
+
     void Control::OnPositionChanged(PositionChangedEventArgs & args)
     {
 
diff --git a/src/ui/control.hpp b/src/ui/control.hpp
index 8ac9ae72..7afc0c4e 100644
--- a/src/ui/control.hpp
+++ b/src/ui/control.hpp
@@ -221,7 +221,9 @@ namespace cru::ui
         events::FocusChangeEvent get_focus_event;
         events::FocusChangeEvent lose_focus_event;
 
-        events::DrawEvent draw_event;
+        events::DrawEvent draw_content_event;
+        events::DrawEvent draw_background_event;
+        events::DrawEvent draw_foreground_event;
 
         events::PositionChangedEvent position_changed_event;
         events::SizeChangedEvent size_changed_event;
@@ -238,10 +240,12 @@ namespace cru::ui
         virtual void OnDetachToWindow(Window* window);
 
     private:
-        void OnDraw(ID2D1DeviceContext* device_context);
+        void OnDrawCore(ID2D1DeviceContext* device_context);
 
     protected:
         virtual void OnDrawContent(ID2D1DeviceContext* device_context);
+        virtual void OnDrawForeground(ID2D1DeviceContext* device_context);
+        virtual void OnDrawBackground(ID2D1DeviceContext* device_context);
 
         // For a event, the window event system will first dispatch event to core functions.
         // Therefore for particular controls, you should do essential actions in core functions,
-- 
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