| |
| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef TouchGesture_DEFINED |
| #define TouchGesture_DEFINED |
| |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/private/base/SkTDArray.h" |
| |
| class TouchGesture { |
| public: |
| TouchGesture(); |
| ~TouchGesture(); |
| |
| void touchBegin(void* owner, float x, float y); |
| void touchMoved(void* owner, float x, float y); |
| void touchEnd(void* owner); |
| void reset(); |
| void resetTouchState(); |
| |
| bool isActive() { return fFlinger.isActive(); } |
| void stop() { fFlinger.stop(); } |
| bool isBeingTouched() { return kEmpty_State != fState; } |
| bool isFling(SkPoint* dir); |
| |
| void startZoom(); |
| void updateZoom(float scale, float startX, float startY, float lastX, float lastY); |
| void endZoom(); |
| |
| const SkMatrix& localM(); |
| const SkMatrix& globalM() const { return fGlobalM; } |
| |
| void setTransLimit(const SkRect& contentRect, const SkRect& windowRect, |
| const SkMatrix& preTouchM); |
| |
| private: |
| enum State { |
| kEmpty_State, |
| kTranslate_State, |
| kZoom_State, |
| }; |
| |
| struct Rec { |
| void* fOwner; |
| float fStartX, fStartY; |
| float fPrevX, fPrevY; |
| float fLastX, fLastY; |
| float fPrevT, fLastT; |
| }; |
| SkTDArray<Rec> fTouches; |
| |
| State fState; |
| SkMatrix fLocalM, fGlobalM, fPreTouchM; |
| |
| struct FlingState { |
| FlingState() : fActive(false) {} |
| |
| bool isActive() const { return fActive; } |
| void stop() { fActive = false; } |
| |
| void reset(float sx, float sy); |
| bool evaluateMatrix(SkMatrix* matrix); |
| |
| void get(SkPoint* dir, SkScalar* speed) { |
| *dir = fDirection; |
| *speed = fSpeed0; |
| } |
| |
| private: |
| SkPoint fDirection; |
| SkScalar fSpeed0; |
| double fTime0; |
| bool fActive; |
| }; |
| FlingState fFlinger; |
| double fLastUpMillis; |
| SkPoint fLastUpP; |
| |
| // The following rects are used to limit the translation so the content never leaves the window |
| SkRect fContentRect, fWindowRect; |
| bool fIsTransLimited = false; |
| |
| void limitTrans(); // here we only limit the translation with respect to globalM |
| void flushLocalM(); |
| int findRec(void* owner) const; |
| void appendNewRec(void* owner, float x, float y); |
| float computePinch(const Rec&, const Rec&); |
| bool handleDblTap(float, float); |
| }; |
| |
| #endif |