fbfcd56021
This CL is part I of IV (I broke down the 1280 files into 4 CLs). Review URL: https://codereview.appspot.com/6485054 git-svn-id: http://skia.googlecode.com/svn/trunk@5262 2bbb7eff-a529-9590-31e7-b0007b416f81
80 lines
1.7 KiB
C++
80 lines
1.7 KiB
C++
|
|
/*
|
|
* 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 SkTouchGesture_DEFINED
|
|
#define SkTouchGesture_DEFINED
|
|
|
|
#include "SkTDArray.h"
|
|
#include "SkMatrix.h"
|
|
|
|
struct SkFlingState {
|
|
SkFlingState() : fActive(false) {}
|
|
|
|
bool isActive() const { return fActive; }
|
|
void stop() { fActive = false; }
|
|
|
|
void reset(float sx, float sy);
|
|
bool evaluateMatrix(SkMatrix* matrix);
|
|
|
|
private:
|
|
SkPoint fDirection;
|
|
SkScalar fSpeed0;
|
|
double fTime0;
|
|
bool fActive;
|
|
};
|
|
|
|
class SkTouchGesture {
|
|
public:
|
|
SkTouchGesture();
|
|
~SkTouchGesture();
|
|
|
|
void touchBegin(void* owner, float x, float y);
|
|
void touchMoved(void* owner, float x, float y);
|
|
void touchEnd(void* owner);
|
|
void reset();
|
|
|
|
bool isActive() { return fFlinger.isActive(); }
|
|
void stop() { fFlinger.stop(); }
|
|
|
|
const SkMatrix& localM();
|
|
const SkMatrix& globalM() const { return fGlobalM; }
|
|
|
|
private:
|
|
enum State {
|
|
kEmpty_State,
|
|
kTranslate_State,
|
|
kZoom_State,
|
|
};
|
|
|
|
struct Rec {
|
|
void* fOwner;
|
|
float fStartX, fStartY;
|
|
float fPrevX, fPrevY;
|
|
float fLastX, fLastY;
|
|
SkMSec fPrevT, fLastT;
|
|
};
|
|
SkTDArray<Rec> fTouches;
|
|
|
|
State fState;
|
|
SkMatrix fLocalM, fGlobalM;
|
|
SkFlingState fFlinger;
|
|
SkMSec fLastUpT;
|
|
SkPoint fLastUpP;
|
|
|
|
|
|
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
|
|
|
|
|