1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192 |
- /*
- * 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/private/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);
- 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&);
- float limitTotalZoom(float scale) const;
- bool handleDblTap(float, float);
- };
- #endif
|