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/* @@@LICENSE
*
* Copyright (c) 2012 Hewlett-Packard Development Company, L.P.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
LICENSE@@@ */
#ifndef KINETICSCROLLER_H
#define KINETICSCROLLER_H
#include <glib.h>
class KineticScrollerListener
{
public:
KineticScrollerListener() {}
virtual ~KineticScrollerListener() {}
virtual void scrollTo(int x, int y) = 0;
virtual void startedAnimating() = 0;
virtual void stoppedAnimating() = 0;
};
class KineticScroller
{
public:
KineticScroller(GMainContext* glibCtxt);
~KineticScroller();
void setListener(KineticScrollerListener* listener);
void setViewportDimensions(int width, int height);
void setContentDimensions(int width, int height);
void scrollTo(int x, int y, bool animate);
void handleMouseDown(int x, int y);
void handleMouseMove(int x, int y);
void handleMouseUp(int x, int y);
void handleMouseFlick(int xVel, int yVel);
private:
double getTime();
void constrain();
void verlet();
void friction(double& inEx, double& inEx0, double inCoeff);
double simulate(double t);
double boundaryDamping(double value, double aBoundary, double bBoundary, double coeff);
double damping(double value, double origin, double coeff, int sign);
double topBoundary() const;
double bottomBoundary() const;
double leftBoundary() const;
double rightBoundary() const;
void start();
void stop();
void animate();
GMainContext* m_glibCtxt;
KineticScrollerListener* m_listener;
static gboolean timeoutCb(gpointer data);
void trackScrollLock(int x, int y);
double m_scrollX;
double m_scrollY;
double m_viewportWidth;
double m_viewportHeight;
double m_contentWidth;
double m_contentHeight;
double m_lastMouseX;
double m_lastMouseY;
GSource* m_timerSource;
bool m_dragging;
double m_t;
double m_t0;
double m_x0;
double m_y0;
double m_my;
double m_py;
double m_uy;
double m_mx;
double m_px;
double m_ux;
private:
enum ScrollLock {
ScrollLockInvalid = 0,
ScrollLockFree,
ScrollLockHoriz,
ScrollLockVert
};
ScrollLock m_scrollLock;
int m_recordedMouseX;
int m_recordedMouseY;
};
#endif /* KINETICSCROLLER_H */
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