Pinch Image with carousel and working fine

[pepperseb]

Ok guys, this is my improvement to prevent switching between images when active image is zoomed in.

Thanks umbro77 for giving me some hints.

In the imageviewer:

Add

config: {
...,
isZoomed: false
...
}

Add two lines in onDoubleTap function:

onDoubleTap: function(ev, t) {
        var me = this,
            scroller = me.getScrollable().getScroller(),
            scrollPosition = scroller.position,
            element = me.element;


        if(!me.getDoubleTapScale())
            return false;
        
        // set scale and translation
        if(me.scale > me.baseScale) {
            // ZOOM OUT to base view
            me.setIsZoomed(false);
            me.scale = me.baseScale;
            me.setTranslation(me.translateBaseX, me.translateBaseY);
            // reset origin and update transform with new translation
            me.applyTransform();


            // adjust scroll container
            me.adjustScroller();
            
            // force repaint to solve occasional iOS rendering delay
            Ext.repaint();
        }
        else {
            // ZOOM IN toward tap position
            me.setIsZoomed(true);
            var oldScale = me.scale,
                newScale = me.baseScale * me.getZoomRatio(),
                originViewportX = ev ? (ev.pageX - element.getX()) : 0,
                originViewportY = ev ? (ev.pageY - element.getY()) : 0,
                originScaledImgX = originViewportX + scrollPosition.x - me.translateX,
                originScaledImgY = originViewportY + scrollPosition.y - me.translateY,
                originReScaledImgX = originScaledImgX * (newScale / oldScale),
                originReScaledImgY = originScaledImgY * (newScale / oldScale);
            
            me.scale = newScale;
            
            //smoothes the transition
            setTimeout(function(){
                me.setTranslation(originViewportX - originReScaledImgX, originViewportY - originReScaledImgY);
                // reset origin and update transform with new translation
                me.applyTransform();


                // adjust scroll container
                me.adjustScroller();
                
                // force repaint to solve occasional iOS rendering delay
                Ext.repaint();
            },50)
        }
    },

In your carousel, you should have a onDragStart function (line 343 for me), just add:

onDragStart: function(e) {
        // if current image is zoomed in, stop switching
        if (this.getActiveItem().getIsZoomed()) {  
            e.stopPropagation();
            return;
        }
        var direction = this.getDirection(),
            absDeltaX = e.absDeltaX,
            absDeltaY = e.absDeltaY,
            directionLock = this.getDirectionLock();

....

Hope this helps!!!

[SunboX]

Could someone please put all those "I optimized this" and "I fixed that" code togehter in one slideshow class? And maybe, host that class somewhere togehter with an example?

thx Sunny

[michelerota77]

If you put the carousel inside a nestedList as a detailCard, it works only the first time.

To fix, i changed the ImageCarousel activeitemchange and the activate listeners.
Note the "container.getScrollable()" in "activeitemchange" and "component.setActiveItem(0)" in "activate"

listeners : {
      activeitemchange: function(container, value, oldValue, eOpts){
        if(container.getScrollable() && oldValue){
          oldValue.resetZoom();
          this.getActiveItem().resize();
        }
      },
      
      resize: function(component, eOpts){
        this.getActiveItem().resize();
      },
      
      activate: function(component){
        component.setActiveItem(0);
      }
    }

[phimaur]

Nice work.
On my ipad, at the end of a pinch/zoom gesture, the image disappears and reappears very fast.
Is there a way to avoid that?
Thanks

[Jamesaya]

You did amazing images component.

Is there any possibility let the HTML contents can be zoom in/out like images?

[contech]

Hey,

ImageViewer#onImageLoad if this.viewportWidth > this.baseScale * this.imgWidth, translateX and translateBaseX will be negativ and the image will be cut off. #setTransition use the < 0 evaluation and works correct so I changed the lines:

// set initial translation to center
this.translateX = this.translateBaseX = (this.viewportWidth - this.baseScale * this.imgWidth) / 2;
this.translateY = this.translateBaseY = (this.viewportHeight - this.baseScale * this.imgHeight) / 2;

to:

// calc initial translation
var tmpTranslateX = (this.viewportWidth - this.baseScale * this.imgWidth) / 2;
var tmpTranslateY = (this.viewportHeight - this.baseScale * this.imgHeight) / 2;


// set initial translation to center
this.setTranslation(tmpTranslateX, tmpTranslateY);
this.translateBaseX = this.translateX;
this.translateBaseY = this.translateY;

That works for me :-)

[armode]

Hi contech

thanks for your suggestion!
I can't find any case where the translate variables are getting < 0 on load?
In my code it looks like that this case is not possible, because of:

me.baseScale = Math.min(me.viewportWidth/me.imgWidth, me.viewportHeight/me.imgHeight);

Maybe you doesn't use the latest version of this component? You don't use the perfomance optimisation with coping the scope into the me variable...

[jeroenwalter]

Don't read this the wrong way, I use this component (with my own modifications) but keeping up with all changes here is hard.
You refer to the latest version, so what would that be?
This thread continually posts some version and separate fixes all over the place.
If someone would be so nice as to make a github repository or such for this component, then development could be more streamlined imo.

[allisterf]

I think many people are asking the same thing, Jeroen. The thread has become so complicated and diverse that the majority have little or no chance of geting this component going. You suggest putting something on GitHub - great idea - and as you seem to have a working version, any chance you can get the ball rolling and we could start with that...?

allister

[jeroenwalter]

My version already is on Github.
It is part of my comic reader web app.
You can find it here https://github.com/jeroenwalter/Bada...ImageViewer.js

It is however modified for my own use so it fits better in my project. It is also based on a version from a few months back.

Maybe I will create a new repository for it, because I haven't changed that much and I think the changes I made may be useful to others.

However, I'm quite pleased with how it is working right now, so I don't plan to work on it until I need something fixed or have to add a new feature.

Right now my focus is on making the web app as a whole better. I'm in the process of rewriting the whole comic reader so it will be a plugin for ComicRack.
For details you may take a look at http://www.badaap.nl/wordpress/badaa...ck-web-viewer/