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// -*- Mode: ObjC; 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 "MLOGestureLimiter.h"
#import "MLOGestureEngine_Impl.h"
#import "MLOMainViewController_Friend.h"
#import "MLOScrollerData.h"
#import "MLOScrollerViewController.h"
#import "MLORenderManager_Impl.h"
#import "mlo_utils.h"
#import "mlo_uno.h"
@interface MLOGestureLimiter ()
@property MLOGestureEngine * engine;
@property MLOMainViewController * mainViewController;
@property CGFloat actualZoom;
@property CGFloat actualPixelToLogicScale;
@property CGSize halfViewSizeInLogic;
@property CGPoint viewCenterInLogic;
@property BOOL didCreateViewCenterInLogic;
@property CGFloat initialPinchZoom;
@property CGFloat previousPinchScale;
@property CGFloat previousScaleSentToLibreOffice;
@end
static const CGFloat DELTA_SCALE_ZOOM_IN_THRESHOLD=1.5f,
DELTA_SCALE_ZOOM_OUT_THRESHOLD=0.7f,
MIN_ZOOM_FOR_HORIZONAL_PAN = 133.0f;
@implementation MLOGestureLimiter
-(CGFloat) zoom{
return self.actualZoom;
}
-(id) initWithGestureEngine:(MLOGestureEngine *) engine{
self = [self init];
if(self){
self.engine= engine;
self.mainViewController = nil;
}
return self;
}
-(void) showLibreOffice{
self.mainViewController = _engine.mainViewController;
[self resetLocationMetrics];
}
-(NSString *)azimuthToString:(CGFloat) delta direction:(MLOPixelDeltaDirection) direction{
if(delta==0){
return @"N/A";
}
switch (direction) {
case DELTA_X:
if(delta < 0.0f) {
return @"swipe LEFT (scroll right)";
}
return @"swipe RIGHT (scroll left)";
case DELTA_Y:
if(delta < 0.0f){
return @"swipe UP (scroll down)";
}
return @"swipe DOWN (scroll up)";
}
}
-(void)logPanRawDeltaX:(NSInteger) rawDeltaX rawDeltaY:(NSInteger) rawDeltaY limitedDeltaX:(NSInteger) limitedDeltaX limitedDeltaY:(NSInteger) limitedDeltaY{
NSLog(@"PAN %@ %@: limited:(%d,%d) raw:(%d,%d) center:(%d,%d) viewSize:(%d,%d) logicSize:(%d,%d)",
[self azimuthToString:rawDeltaX direction:DELTA_X],
[self azimuthToString:rawDeltaY direction:DELTA_Y],
limitedDeltaX,
limitedDeltaY,
rawDeltaX,
rawDeltaY,
(NSInteger)self.viewCenterInLogic.x,
(NSInteger)self.viewCenterInLogic.y,
(NSInteger)self.halfViewSizeInLogic.width *2,
(NSInteger)self.halfViewSizeInLogic.height *2,
(NSInteger)self.documentSizeInLogic.width,
(NSInteger)self.documentSizeInLogic.height);
}
-(CGFloat)limitDelta:(CGFloat) delta direction:(MLOPixelDeltaDirection) direction{
if(delta==0){
return 0;
}
CGFloat deltaInLogic = [self pixelsToLogic:delta];
CGFloat limit = [self limitForRawDelta:deltaInLogic direction:direction];
if(deltaInLogic > 0){
deltaInLogic = min(limit,deltaInLogic);
}else{
deltaInLogic = max(limit,deltaInLogic);
}
[self updateCenterInLogic:deltaInLogic direction:direction];
return [self logicToPixels:deltaInLogic];
}
-(CGFloat) limitForRawDelta:(CGFloat) raw direction:(MLOPixelDeltaDirection) direction{
CGFloat halfscreen = [self halfViewSizeInLogic:direction];
CGFloat center = [self viewCenterCord:direction];
CGFloat limit;
if(raw < 0.0f){
CGFloat document = [self documentSizeInLogic:direction];
limit = halfscreen + center - document;
if(LOG_GESTURE_LIMITING){
NSLog(@"%@ LIMIT: raw=%f limit(%f) = halfscreen(%f) + center(%f) - document(%f)",MLOPixelDeltaDirectionString(direction),raw,limit,halfscreen,center,document);
}
}else{
limit = center - halfscreen;
if(LOG_GESTURE_LIMITING){
NSLog(@"%@ LIMIT: raw=%f limit(%f) = center(%f) - halfscreen(%f)",MLOPixelDeltaDirectionString(direction),raw,limit,center,halfscreen);
}
}
if(limit*raw <0){
// negative means limit flipped sign, so limit is zero
return 0;
}
return limit;
}
-(CGFloat) halfViewSizeInLogic:(MLOPixelDeltaDirection) direction{
switch (direction) {
case DELTA_X: return self.halfViewSizeInLogic.width;
case DELTA_Y: return self.halfViewSizeInLogic.height;
}
}
-(CGFloat) documentSizeInLogic:(MLOPixelDeltaDirection) direction{
switch (direction) {
case DELTA_X: return self.documentSizeInLogic.width;
case DELTA_Y: return self.documentSizeInLogic.height;
}
}
-(CGFloat) viewCenterCord:(MLOPixelDeltaDirection) direction{
switch (direction) {
case DELTA_X: return [self centerInLogic].x;
case DELTA_Y: return [self centerInLogic].y;
}
}
-(void) updateCenterInLogic:(CGFloat) delta direction:(MLOPixelDeltaDirection) direction{
switch (direction) {
case DELTA_X: _viewCenterInLogic.x-=delta; break;
case DELTA_Y: _viewCenterInLogic.y-=delta; break;
}
}
-(void)createHalfViewSizeInLogic{
self.halfViewSizeInLogic = CGSizeMake(_mainViewController.canvas.frame.size.width
* self.actualPixelToLogicScale
/ 2.0f,
_mainViewController.canvas.frame.size.height
* self.actualPixelToLogicScale
/ 2.0f);
}
-(CGFloat)pixelsToLogic:(CGFloat) distanceInPixels{
return roundf(self.actualPixelToLogicScale * distanceInPixels);
}
-(CGFloat)logicToPixels:(CGFloat) distanceInLogic{
return roundf(distanceInLogic / self.actualPixelToLogicScale);
}
-(CGPoint)centerInLogic{
if(!self.didCreateViewCenterInLogic){
[self createHalfViewSizeInLogic];
self.viewCenterInLogic = CGPointMake(self.halfViewSizeInLogic.width,
self.halfViewSizeInLogic.height);
self.didCreateViewCenterInLogic = YES;
}
return self.viewCenterInLogic;
}
-(void)resetLocationMetrics{
self.actualZoom = 100.0f;
[self updateActualZoom:100.f];
self.didCreateViewCenterInLogic = NO;
}
-(void)updateActualZoom:(CGFloat) newActualZoom{
CGFloat viewResizeScale = self.actualZoom / newActualZoom;
self.halfViewSizeInLogic = CGSizeMake(self.halfViewSizeInLogic.width * viewResizeScale,
self.halfViewSizeInLogic.height * viewResizeScale);
self.actualZoom = newActualZoom;
static const CGFloat PIXEL_TO_LOGIC_RATION_TIMES_HUNDRED = PIXEL_TO_LOGIC_RATIO * 100.0f;
self.actualPixelToLogicScale = PIXEL_TO_LOGIC_RATION_TIMES_HUNDRED / newActualZoom;
}
-(void)beginPinch{
[_mainViewController.scroller updateByLogic];
self.previousPinchScale = NO_SCALE;
self.previousScaleSentToLibreOffice = NO_SCALE;
self.initialPinchZoom = self.actualZoom;
}
-(void)onRotate{
if(self.didCreateViewCenterInLogic){
[self createHalfViewSizeInLogic];
}
}
-(CGFloat) inPinchGetRatioToLastScale:(CGFloat)newScale{
CGFloat newZoom = self.initialPinchZoom *newScale;
newZoom = max(min(newZoom, MAX_ZOOM),MIN_ZOOM);
NSLog(@"new zoom is %f",newZoom);
[self updateActualZoom:newZoom];
newScale = newZoom / self.initialPinchZoom;
CGFloat scaleRatioToLastScale = newScale / self.previousPinchScale;
self.previousPinchScale =newScale;
return scaleRatioToLastScale;
}
-(void)fireLoZoomEventsDuringPinch{
CGFloat deltaScale = self.previousPinchScale / self.previousScaleSentToLibreOffice;
if((deltaScale > DELTA_SCALE_ZOOM_IN_THRESHOLD) ||
(deltaScale < DELTA_SCALE_ZOOM_OUT_THRESHOLD)){
self.previousScaleSentToLibreOffice = self.previousPinchScale;
[_engine loZoomDeltaX:0.0f deltaY:0.0f scale:deltaScale];
}
}
-(CGFloat)endPinchAndGetScaleForLo:(CGFloat)scale{
[self updateActualZoom: floorf(self.actualZoom)];
return scale/self.previousScaleSentToLibreOffice;
}
-(CGFloat)currentPinchScale{
return self.previousPinchScale;
}
@end
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