Improvements to the SampleApp (primarily Android).

Reviewed at http://codereview.appspot.com/4587042/

Android
- Added buttons for interaction without a keyboard.
- Added the ability to zoom in to a specific point (roughly).
- Added event handling (for showing a slideshow, for example).
- Allow changing screen orientation
- Updated README file, explaining how to build

Multiplatform changes
- Added SampleApp header file
- Remove FPS when turning off measure FPS mode


git-svn-id: http://skia.googlecode.com/svn/trunk@1596 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 145 insertions, 0 deletions

diff --git a/samplecode/SampleApp.h b/samplecode/SampleApp.h
new file mode 100644
index 0000000000..37a3d0959a
--- /dev/null
+++ b/samplecode/SampleApp.h
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2011 Skia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SampleWindow_DEFINED
+#define SampleWindow_DEFINED
+
+#include "SkWindow.h"
+
+#include "SampleCode.h"
+#include "SkPath.h"
+#include "SkScalar.h"
+#include "SkTDArray.h"
+#include "SkTouchGesture.h"
+#include "SkWindow.h"
+
+class GrContext;
+
+class SkEvent;
+class SkCanvas;
+class SkGpuCanvas;
+class SkPicture;
+class SkTypeface;
+
+enum SkTriState {
+    kFalse_SkTriState,
+    kTrue_SkTriState,
+    kUnknown_SkTriState,
+};
+
+class SampleWindow : public SkOSWindow {
+    SkTDArray<SkViewFactory> fSamples;
+public:
+    SampleWindow(void* hwnd);
+    virtual ~SampleWindow();
+
+    virtual void draw(SkCanvas* canvas);
+
+    void toggleRendering();
+    void toggleSlideshow();
+    void toggleFPS();
+    bool drawsToHardware() { return fCanvasType == kGPU_CanvasType; }
+    bool setGrContext(GrContext*);
+    GrContext* getGrContext();
+    void setZoomCenter(float x, float y);
+    void changeZoomLevel(float delta);
+    bool nextSample();
+    bool previousSample();
+
+protected:
+    virtual void onDraw(SkCanvas* canvas);
+    virtual bool onHandleKey(SkKey key);
+    virtual bool onHandleChar(SkUnichar);
+    virtual void onSizeChange();
+
+    virtual SkCanvas* beforeChildren(SkCanvas*);
+    virtual void afterChildren(SkCanvas*);
+    virtual void beforeChild(SkView* child, SkCanvas* canvas);
+    virtual void afterChild(SkView* child, SkCanvas* canvas);
+
+    virtual bool onEvent(const SkEvent& evt);
+    virtual bool onQuery(SkEvent* evt);
+
+    virtual bool onDispatchClick(int x, int y, Click::State);
+    virtual bool onClick(Click* click);
+    virtual Click* onFindClickHandler(SkScalar x, SkScalar y);
+
+private:
+    int fCurrIndex;
+
+    SkPicture* fPicture;
+    SkGpuCanvas* fGpuCanvas;
+    GrContext* fGrContext;
+    SkPath fClipPath;
+
+    SkTouchGesture fGesture;
+    SkScalar fZoomLevel;
+    SkScalar fZoomScale;
+
+    enum CanvasType {
+        kRaster_CanvasType,
+        kPicture_CanvasType,
+        kGPU_CanvasType
+    };
+    CanvasType fCanvasType;
+
+    bool fUseClip;
+    bool fNClip;
+    bool fRepeatDrawing;
+    bool fAnimating;
+    bool fRotate;
+    bool fScale;
+    bool fRequestGrabImage;
+    bool fUsePipe;
+    bool fMeasureFPS;
+    SkMSec fMeasureFPS_Time;
+
+    // The following are for the 'fatbits' drawing
+    // Latest position of the mouse.
+    int fMouseX, fMouseY;
+    int fFatBitsScale;
+    // Used by the text showing position and color values.
+    SkTypeface* fTypeface;
+    bool fShowZoomer;
+
+    SkTriState fLCDState;
+    SkTriState fAAState;
+    SkTriState fFilterState;
+    SkTriState fHintingState;
+    unsigned   fFlipAxis;
+
+    int fScrollTestX, fScrollTestY;
+    SkScalar fZoomCenterX, fZoomCenterY;
+
+    bool make3DReady();
+
+    void loadView(SkView*);
+    void updateTitle();
+
+    void toggleZoomer();
+    bool zoomIn();
+    bool zoomOut();
+    void updatePointer(int x, int y);
+    void showZoomer(SkCanvas* canvas);
+
+    void postAnimatingEvent();
+
+    static CanvasType cycle_canvastype(CanvasType);
+
+    typedef SkOSWindow INHERITED;
+};
+
+#endif