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// -*- Mode: Objective-C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
//
// This file is part of the LibreOffice project.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#import "MLOGestureFlick.h"
#import "MLOGestureEngine_Impl.h"
#import "MLOMainViewController.h"
#import "MLOScrollerViewController.h"
#import "MLORenderManager.h"
#import "MLOAnimation.h"
#import "mlo_utils.h"
@interface MLOGestureFlick ()
@property MLOGestureEngine * engine;
@property CFTimeInterval startTime;
@property CGPoint startPoint;
@property CGFloat xFlickSpeed,yFlickSpeed;
@property BOOL isEvaluatingFlic;
@end
static const CGFloat
MAX_SPEED = MLO_IPAD_HEIGHT_IN_PIXELS/0.5f, // max speed is the height per half a second
MAX_DURATION = 5.0f, // 5 seconds flic top
DECCELERATION = 800.0f,
SPEED_IGNORE_LIMIT=2.0f,
FLICK_FPS=50.0f;
static const NSTimeInterval
MAX_INTERVAL_BETWEEN_EVENTS_THRESHOLD=0.7f; // 70% a second
@implementation MLOGestureFlick
-(CGFloat) normalizeSpeed:(CGFloat) gestureSpeed currentSpeed:(CGFloat) currentSpeed{
NSLog(@"GestureSpeed=%f currentSpeed=%f",gestureSpeed,currentSpeed);
if(currentSpeed* gestureSpeed > 0){
gestureSpeed+=currentSpeed;
}
if(gestureSpeed > MAX_SPEED){
return MAX_SPEED;
}
if (gestureSpeed < -MAX_SPEED){
return -MAX_SPEED;
}
if (abs(gestureSpeed) < SPEED_IGNORE_LIMIT) {
return 0;
}
return gestureSpeed;
}
-(id)initWithEngine:(MLOGestureEngine *) engine{
self = [self init];
if(self){
self.engine = engine;
_startTime = -1;
_yFlickSpeed= _xFlickSpeed=0.0f;
_isEvaluatingFlic =NO;
}
return self;
}
-(BOOL)eval:(UIGestureRecognizer *) gesture{
BOOL returned = NO;
UIGestureRecognizerState state = gesture.state;
if(state == UIGestureRecognizerStateBegan){
self.isEvaluatingFlic = YES;
self.startTime = CACurrentMediaTime();
self.startPoint = [gesture locationInView:_engine.renderer.view];
}else if(state == UIGestureRecognizerStateFailed
|| state == UIGestureRecognizerStateCancelled){
self.startTime = -1;
self.isEvaluatingFlic =NO;
}else{
if(state == UIGestureRecognizerStateEnded){
CFTimeInterval startTime = self.startTime;
CGFloat xSpeed = self.xFlickSpeed;
CGFloat ySpeed = self.yFlickSpeed;
[_engine.currentAnimation cancel];
if(startTime > 0){
CGPoint t0 =self.startPoint;
CFTimeInterval deltaT = CACurrentMediaTime() - startTime;
self.startTime =-1;
if( (deltaT < MAX_INTERVAL_BETWEEN_EVENTS_THRESHOLD) &&
(deltaT > 0) &&
(_engine.handledGesturesCount == 0)){
CGPoint t1 = [gesture locationInView:_engine.renderer.view];
returned = [self flicXSpeed: [self normalizeSpeed: (t1.x - t0.x) / deltaT
currentSpeed: xSpeed]
ySpeed: [self normalizeSpeed: (t1.y - t0.y) / deltaT
currentSpeed: ySpeed]];
}
}
self.isEvaluatingFlic =NO;
}
}
return returned;
}
-(BOOL)flicXSpeed:(CGFloat) xSpeedInitial ySpeed:(CGFloat) ySpeedInitial{
if((xSpeedInitial !=0) || (ySpeedInitial!=0)) {
NSLog(@"FLIC: xSpeed=%f ySpeed=%f",xSpeedInitial, ySpeedInitial);
__block CGFloat xDistanceTotal = 0,yDistanceTotal=0;
const CGFloat maxSpeedVector = max( abs(xSpeedInitial) , abs(ySpeedInitial) );
const CGFloat duration =min( maxSpeedVector / DECCELERATION , MAX_DURATION );
const CGFloat deccelerationRate = maxSpeedVector / duration;
const CGFloat xSign= xSpeedInitial<0? -1: 1;
const CGFloat ySign= ySpeedInitial<0? -1: 1;
MLOScrollerViewController * scroller = _engine.scroller;
__block MLOAnimation * copy = nil;
MLOAnimation * animation =
[[MLOAnimation alloc]
initWithBehavior: CANCELABLE
fractionType: FULL_FRACTION
animation: ^(CGFloat fraction){
CGFloat time = fraction * duration;
CGFloat reducedSpeed = deccelerationRate* time;
CGFloat decelerationDistance = reducedSpeed *time / 2.0f;
CGFloat xDistanceCurrent = xSpeedInitial *time;
CGFloat yDistanceCurrent = ySpeedInitial *time;
CGFloat xSpeedCurrent = 0;
CGFloat ySpeedCurrent = 0;
if(xSign*xDistanceCurrent > decelerationDistance){
xDistanceCurrent -= (xSign * decelerationDistance);
xSpeedCurrent = xSpeedInitial - xSign * reducedSpeed;
}else{
xDistanceCurrent = xDistanceTotal;
}
if(ySign*yDistanceCurrent > decelerationDistance){
yDistanceCurrent -= (ySign * decelerationDistance);
ySpeedCurrent = ySpeedInitial - ySign * reducedSpeed;
}else{
yDistanceCurrent = yDistanceTotal;
}
[self setFlicSpeedX:xSpeedCurrent y:ySpeedCurrent context:@"FLIC iteration"];
CGFloat deltaX = xDistanceCurrent - xDistanceTotal;
CGFloat deltaY = yDistanceCurrent - yDistanceTotal;
if([_engine loPanDeltaX:deltaX deltaY:deltaY state:UIGestureRecognizerStateChanged]){
[scroller updateByPixelDeltaY:deltaY];
xDistanceTotal = xDistanceCurrent;
yDistanceTotal = yDistanceCurrent;
}else{
[copy cancel];
}
} ];
animation.duration = duration;
animation.fps = FLICK_FPS;
[animation linearCurve];
copy = animation;
animation.endBlock = ^{
if(![copy isCancelled] || !self.isEvaluatingFlic){
[self setFlicSpeedX:0.0f y:0.0f context:@"FLIC end"];
[_engine endFlick];
}
};
[_engine.currentAnimation cancel];
_engine.currentAnimation = animation;
[animation animate];
return YES;
}
NSLog(@"FLIC ignored: xSpeed = ySpeed = 0");
return NO;
}
-(void) setFlicSpeedX: (CGFloat) xSpeed y:(CGFloat) ySpeed context:(NSString *)context{
self.xFlickSpeed = xSpeed;
self.yFlickSpeed = ySpeed;
if(LOG_FLICK_FRAMES){
NSLog(@"FLIC (%@) : set xSpeed = %f, ySpeed = %f",context, xSpeed,ySpeed);
}
}
@end
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