Re: View swap using "push" animation
Re: View swap using "push" animation
- Subject: Re: View swap using "push" animation
- From: PCWiz <email@hidden>
- Date: Wed, 11 Nov 2009 11:21:44 -0700
I just realized that the animation only seems to be slow when I'm
running screen capture software to capture video from my screen. Is
this just a coincidence or is it a real possibility that the capture
is slowing the animation down?
On 2009-11-11, at 11:14 AM, PCWiz wrote:
Thanks for your replies :-) Here you can see the distortion.
Before setWantsLayer - http://img21.imageshack.us/img21/43/screenshot20091110at412.png
After - http://img682.imageshack.us/img682/2558/screenshot20091110at424.png
Martin, I tried an NSAnimation subclass and the animation itself
works, but the performance is very poor. Here is my code for the
subclass:
PushAnimation.h
///////////////////
#import <Cocoa/Cocoa.h>
typedef enum {
LeftDirection,
RightDirection
} Direction;
@interface PushAnimation : NSAnimation {
Direction newDirection;
NSView *startingView;
NSView *destinationView;
NSRect originalRect;
NSRect destinationRect;
}
@property(retain) NSView *startingView, *destinationView;
@property(readwrite) Direction newDirection;
@property(readwrite) NSRect originalRect, destinationRect;
- (NSRect)destinationFrameForProgress:(float)progress;
- (NSRect)startingFrameForProgress:(float)progress;
@end
////////////////////////
PushAnimation.m
///////////////////////
#import "PushAnimation.h"
@implementation TMPushAnimation
@synthesize startingView, destinationView, newDirection,
originalRect, destinationRect;
- (void)startAnimation
{
originalRect = [startingView frame];
// First we need to move the destination view off to one side so
that its invisible
if (newDirection == LeftDirection) {
[destinationView setFrame:NSMakeRect(NSMinX(originalRect) - NSWidth
(originalRect), NSMinY(originalRect), NSWidth(originalRect), NSHeight
(originalRect))];
} else {
[destinationView setFrame:NSMakeRect(NSMaxX(originalRect), NSMinY
(originalRect), NSWidth(originalRect), NSHeight(originalRect))];
}
destinationRect = [destinationView frame];
// Unhide the destination view (its going to be invisible because
its not in the view area)
[destinationView setHidden:NO];
[super startAnimation];
}
- (void)setCurrentProgress:(float)progress
{
[super setCurrentProgress:progress];
[startingView setFrame:[self startingFrameForProgress:progress]];
[destinationView setFrame:[self
destinationFrameForProgress:progress]];
// If the animation is finished we want to hide the starting view
(just to make sure)
if (progress == 1.0)
{
[startingView setHidden:YES];
}
}
- (NSRect)startingFrameForProgress:(float)progress
{
NSRect startingViewFrame = originalRect;
// Adjust the X origin of the view based on the animation progress
if (newDirection == LeftDirection) {
startingViewFrame.origin.x = (startingViewFrame.origin.x +
startingViewFrame.size.width) * progress;
} else {
startingViewFrame.origin.x = (startingViewFrame.origin.x -
startingViewFrame.size.width) * progress;
}
return startingViewFrame;
}
- (NSRect)destinationFrameForProgress:(float)progress
{
NSRect destinationViewFrame = destinationRect;
if (newDirection == LeftDirection) {
destinationViewFrame.origin.x = (destinationViewFrame.origin.x +
(destinationViewFrame.size.width * progress));
} else {
destinationViewFrame.origin.x = (destinationViewFrame.origin.x -
(destinationViewFrame.size.width * progress));
}
return destinationViewFrame;
}
@end
////////////////////////////
This is how I would use the subclass:
PushAnimation *animation = [[PushAnimation alloc] initWithDuration:
0.35f animationCurve:NSAnimationLinear];
[animation setNewDirection:LeftDirection];
[animation setStartingView:someView];
[animation setDestinationView:anotherView];
[animation setAnimationBlockingMode:NSAnimationNonblocking];
[animation startAnimation];
[animation release];
The performance seems to be quite slow. Here is a video:
http://yfrog.us/0qscreenflowz
It might seem fast upon first view, but if you look closer you can
see that there is some lag when switching from the main view with
all the content in it to one of the dummy views.
Thanks
On 2009-11-10, at 11:45 PM, Martin Hewitson wrote:
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