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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #ifndef SampleCode_DEFINED
     11 #define SampleCode_DEFINED
     12 
     13 #include "SkColor.h"
     14 #include "SkEvent.h"
     15 #include "SkKey.h"
     16 #include "SkView.h"
     17 class SkOSMenu;
     18 class GrContext;
     19 
     20 class SampleCode {
     21 public:
     22     static bool KeyQ(const SkEvent&, SkKey* outKey);
     23     static bool CharQ(const SkEvent&, SkUnichar* outUni);
     24 
     25     static bool TitleQ(const SkEvent&);
     26     static void TitleR(SkEvent*, const char title[]);
     27     static bool RequestTitle(SkView* view, SkString* title);
     28 
     29     static bool PrefSizeQ(const SkEvent&);
     30     static void PrefSizeR(SkEvent*, SkScalar width, SkScalar height);
     31 
     32     static bool FastTextQ(const SkEvent&);
     33 
     34     static SkMSec GetAnimTime();
     35     static SkMSec GetAnimTimeDelta();
     36     static SkScalar GetAnimSecondsDelta();
     37     static SkScalar GetAnimScalar(SkScalar speedPerSec, SkScalar period = 0);
     38 
     39     static GrContext* GetGr();
     40 };
     41 
     42 //////////////////////////////////////////////////////////////////////////////
     43 
     44 // interface that constructs SkViews
     45 class SkViewFactory : public SkRefCnt {
     46 public:
     47     virtual SkView* operator() () const = 0;
     48 };
     49 
     50 typedef SkView* (*SkViewCreateFunc)();
     51 
     52 // wraps SkViewCreateFunc in SkViewFactory interface
     53 class SkFuncViewFactory : public SkViewFactory {
     54 public:
     55     SkFuncViewFactory(SkViewCreateFunc func);
     56     virtual SkView* operator() () const SK_OVERRIDE;
     57 
     58 private:
     59     SkViewCreateFunc fCreateFunc;
     60 };
     61 
     62 namespace skiagm {
     63 class GM;
     64 }
     65 
     66 // factory function that creates a skiagm::GM
     67 typedef skiagm::GM* (*GMFactoryFunc)(void*);
     68 
     69 // Takes a GM factory function and implements the SkViewFactory interface
     70 // by making the GM and wrapping it in a GMSampleView. GMSampleView bridges
     71 // the SampleView interface to skiagm::GM.
     72 class SkGMSampleViewFactory : public SkViewFactory {
     73 public:
     74     SkGMSampleViewFactory(GMFactoryFunc func);
     75     virtual SkView* operator() () const SK_OVERRIDE;
     76 private:
     77     GMFactoryFunc fFunc;
     78 };
     79 
     80 class SkViewRegister : public SkRefCnt {
     81 public:
     82     explicit SkViewRegister(SkViewFactory*);
     83     explicit SkViewRegister(SkViewCreateFunc);
     84     explicit SkViewRegister(GMFactoryFunc);
     85 
     86     ~SkViewRegister() {
     87         fFact->unref();
     88     }
     89 
     90     static const SkViewRegister* Head() { return gHead; }
     91 
     92     SkViewRegister* next() const { return fChain; }
     93     const SkViewFactory*   factory() const { return fFact; }
     94 
     95 private:
     96     SkViewFactory*  fFact;
     97     SkViewRegister* fChain;
     98 
     99     static SkViewRegister* gHead;
    100 };
    101 
    102 ///////////////////////////////////////////////////////////////////////////////
    103 
    104 class SampleView : public SkView {
    105 public:
    106     SampleView() : fBGColor(SK_ColorWHITE), fRepeatCount(1) {
    107         fUsePipe = false;
    108     }
    109 
    110     void setBGColor(SkColor color) { fBGColor = color; }
    111 
    112     static bool IsSampleView(SkView*);
    113     static bool SetRepeatDraw(SkView*, int count);
    114     static bool SetUsePipe(SkView*, bool);
    115 
    116     /**
    117      *  Call this to request menu items from a SampleView.
    118      *  Subclassing notes: A subclass of SampleView can overwrite this method
    119      *  to add new items of various types to the menu and change its title.
    120      *  The events attached to any new menu items must be handled in its onEvent
    121      *  method. See SkOSMenu.h for helper functions.
    122      */
    123     virtual void requestMenu(SkOSMenu* menu) {}
    124 
    125 protected:
    126     virtual void onDrawBackground(SkCanvas*);
    127     virtual void onDrawContent(SkCanvas*) = 0;
    128 
    129     // overrides
    130     virtual bool onEvent(const SkEvent& evt);
    131     virtual bool onQuery(SkEvent* evt);
    132     virtual void draw(SkCanvas*);
    133     virtual void onDraw(SkCanvas*);
    134 
    135     bool fUsePipe;
    136     SkColor fBGColor;
    137 
    138 private:
    139     int fRepeatCount;
    140 
    141     typedef SkView INHERITED;
    142 };
    143 
    144 #endif
    145 
    146