1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/views/SkTouchGesture.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,77 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2011 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +#ifndef SkTouchGesture_DEFINED
1.12 +#define SkTouchGesture_DEFINED
1.13 +
1.14 +#include "SkTDArray.h"
1.15 +#include "SkMatrix.h"
1.16 +
1.17 +struct SkFlingState {
1.18 + SkFlingState() : fActive(false) {}
1.19 +
1.20 + bool isActive() const { return fActive; }
1.21 + void stop() { fActive = false; }
1.22 +
1.23 + void reset(float sx, float sy);
1.24 + bool evaluateMatrix(SkMatrix* matrix);
1.25 +
1.26 +private:
1.27 + SkPoint fDirection;
1.28 + SkScalar fSpeed0;
1.29 + double fTime0;
1.30 + bool fActive;
1.31 +};
1.32 +
1.33 +class SkTouchGesture {
1.34 +public:
1.35 + SkTouchGesture();
1.36 + ~SkTouchGesture();
1.37 +
1.38 + void touchBegin(void* owner, float x, float y);
1.39 + void touchMoved(void* owner, float x, float y);
1.40 + void touchEnd(void* owner);
1.41 + void reset();
1.42 +
1.43 + bool isActive() { return fFlinger.isActive(); }
1.44 + void stop() { fFlinger.stop(); }
1.45 +
1.46 + const SkMatrix& localM();
1.47 + const SkMatrix& globalM() const { return fGlobalM; }
1.48 +
1.49 +private:
1.50 + enum State {
1.51 + kEmpty_State,
1.52 + kTranslate_State,
1.53 + kZoom_State,
1.54 + };
1.55 +
1.56 + struct Rec {
1.57 + void* fOwner;
1.58 + float fStartX, fStartY;
1.59 + float fPrevX, fPrevY;
1.60 + float fLastX, fLastY;
1.61 + SkMSec fPrevT, fLastT;
1.62 + };
1.63 + SkTDArray<Rec> fTouches;
1.64 +
1.65 + State fState;
1.66 + SkMatrix fLocalM, fGlobalM;
1.67 + SkFlingState fFlinger;
1.68 + SkMSec fLastUpT;
1.69 + SkPoint fLastUpP;
1.70 +
1.71 +
1.72 + void flushLocalM();
1.73 + int findRec(void* owner) const;
1.74 + void appendNewRec(void* owner, float x, float y);
1.75 + float computePinch(const Rec&, const Rec&);
1.76 + float limitTotalZoom(float scale) const;
1.77 + bool handleDblTap(float, float);
1.78 +};
1.79 +
1.80 +#endif
