b53f48cfec
Had to add some logic to avoid touch and mouse cross-talk, because (at least on my laptop), the touch screen generates both kinds of events. This seems really useful [1] for the many [2] Skia developers with touch-enabled Windows devices. ---------- 1: No, not really. 2: N = 1? Bug: skia: Change-Id: Ib888bf4198f2cc0a29a31581ec4b64d3d9008c33 Reviewed-on: https://skia-review.googlesource.com/18920 Reviewed-by: Yuqian Li <liyuqian@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkTouchGesture_DEFINED
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#define SkTouchGesture_DEFINED
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#include "../private/SkTDArray.h"
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#include "SkMatrix.h"
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struct SkFlingState {
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SkFlingState() : fActive(false) {}
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bool isActive() const { return fActive; }
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void stop() { fActive = false; }
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void reset(float sx, float sy);
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bool evaluateMatrix(SkMatrix* matrix);
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private:
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SkPoint fDirection;
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SkScalar fSpeed0;
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double fTime0;
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bool fActive;
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};
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class SkTouchGesture {
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public:
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SkTouchGesture();
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~SkTouchGesture();
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void touchBegin(void* owner, float x, float y);
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void touchMoved(void* owner, float x, float y);
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void touchEnd(void* owner);
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void reset();
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bool isActive() { return fFlinger.isActive(); }
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void stop() { fFlinger.stop(); }
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bool isBeingTouched() { return kEmpty_State != fState; }
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const SkMatrix& localM();
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const SkMatrix& globalM() const { return fGlobalM; }
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void setTransLimit(const SkRect& contentRect, const SkRect& windowRect,
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const SkMatrix& preTouchM);
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private:
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enum State {
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kEmpty_State,
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kTranslate_State,
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kZoom_State,
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};
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struct Rec {
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void* fOwner;
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float fStartX, fStartY;
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float fPrevX, fPrevY;
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float fLastX, fLastY;
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float fPrevT, fLastT;
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};
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SkTDArray<Rec> fTouches;
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State fState;
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SkMatrix fLocalM, fGlobalM, fPreTouchM;
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SkFlingState fFlinger;
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double fLastUpMillis;
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SkPoint fLastUpP;
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// The following rects are used to limit the translation so the content never leaves the window
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SkRect fContentRect, fWindowRect;
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bool fIsTransLimited = false;
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void limitTrans(); // here we only limit the translation with respect to globalM
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void flushLocalM();
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int findRec(void* owner) const;
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void appendNewRec(void* owner, float x, float y);
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float computePinch(const Rec&, const Rec&);
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float limitTotalZoom(float scale) const;
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bool handleDblTap(float, float);
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};
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#endif
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