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Unified Diff: experimental/SkV8Example/SkV8Example.h

Issue 110693002: Add a canvas object with drawRect() and inval(). (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Fix up code to Skia style. Created 7 years ago
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Index: experimental/SkV8Example/SkV8Example.h
diff --git a/experimental/SkV8Example/SkV8Example.h b/experimental/SkV8Example/SkV8Example.h
index 97cf58017122f860d2fdb29b78644bc94ebc8c97..878e1f0f1f8db13a1ce9a5d863711af648637576 100644
--- a/experimental/SkV8Example/SkV8Example.h
+++ b/experimental/SkV8Example/SkV8Example.h
@@ -14,36 +14,86 @@
#include "SkWindow.h"
-
using namespace v8;
-
class SkCanvas;
-
+class JsCanvas;
class SkV8ExampleWindow : public SkOSWindow {
public:
- SkV8ExampleWindow(void* hwnd,
- Isolate* isolate,
- Handle<Context> context,
- Handle<Script> script);
-
+ SkV8ExampleWindow(void* hwnd, JsCanvas* canvas);
protected:
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE;
-
-
#ifdef SK_BUILD_FOR_WIN
virtual void onHandleInval(const SkIRect&) SK_OVERRIDE;
#endif
private:
typedef SkOSWindow INHERITED;
+ SkScalar fRotationAngle;
+ JsCanvas* fJsCanvas;
+};
+
+
+// Provides the canvas implementation in JS, and the OnDraw() method in C++
+// that's used to bridge from C++ to JS. Should be used in JS as:
+//
+// function onDraw(canvas) {
+// canvas.drawRect();
+// canvas.inval();
+// }
+//
+class JsCanvas {
+public:
+ JsCanvas(Isolate* isolate)
+ : fIsolate(isolate)
+ , fCanvas(NULL)
+ , fWindow(NULL)
+ {}
+ ~JsCanvas();
+
+ // Parse the script.
+ bool initialize(const char script[]);
+
+ // Call this with the SkCanvas you want onDraw to draw on.
+ void onDraw(SkCanvas* canvas, SkOSWindow* window);
+
+private:
+ // Implementation of the canvas.drawRect() JS function.
+ static void drawRect(const v8::FunctionCallbackInfo<Value>& args);
+
+ // Implementation of the canvas.inval() JS function.
+ static void inval(const v8::FunctionCallbackInfo<Value>& args);
+
+ // Get the pointer out of obj.
+ static JsCanvas* unwrap(Handle<Object> obj);
+
+ // Create a template for JS object associated with JsCanvas, called lazily
+ // by Wrap() and the results are stored in fCanvasTemplate;
+ Handle<ObjectTemplate> makeCanvasTemplate();
+
+ // Wrap the 'this' pointer into an Object. Can be retrieved via Unwrap.
+ Handle<Object> wrap();
+
Isolate* fIsolate;
+
+ // Only valid when inside OnDraw().
+ SkCanvas* fCanvas;
+
+ // Only valid when inside OnDraw().
+ SkOSWindow* fWindow;
+
+ // The context that the script will be parsed into.
Persistent<Context> fContext;
- Persistent<Script> fScript;
- SkScalar fRotationAngle;
+
+ // A handle to the onDraw function defined in the script.
+ Persistent<Function> fOnDraw;
+
+ // The template for what a canvas object looks like. The canvas object is
+ // what's passed into the JS onDraw() function.
+ static Persistent<ObjectTemplate> fCanvasTemplate;
};
#endif
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