Lightning Launcher

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====== About the script ======
  * Purpose : This is a script that place an item (in the video a panel) always on top of the screen. Scroll down the desktop to show it. Scroll up to hide.
  * Author : [[https://plus.google.com/u/1/105066926163073195690|TrianguloY]]
  * Link: https://plus.google.com/u/1/105066926163073195690/posts/DPufvGD2SjF (With video)

====== How to use the script ======

Instructions:
  * Copy paste this script as a new one.
  * IMPORTANT: you need to label "always-bar" the item you want to move
  * Pin that item and detach it from the screen
  * Set the script in the position change event of the desired container

Settings:   
  * you can change the velocity the item is scrolled. Just change the numbers of the first part of the script, nothing more.
  * NEW : you can specify the direction of scrolling vertically and horizontally. Change the parameter in the config (you can have vertical and horizontal simultaneously)

====== Script code ======
<sxh javascript>
 
//this number means the velocity of showing/hidding respectively
//1 is the default ( like the desktop ) the bigger, the faster (avoid negative numbers, between (0,1) will be slower )
var vs = 2;//show
var vh = 0.5;//hide

//this will set the direction
var vertical = 1;//-1,0,1 bottom,disable,top
var horizontal = 0; //-1,0,1 left,disable,right


var cont = LL.getEvent().getContainer();
//item to move
var bar = cont.getItemByLabel("always-bar");

if(bar==null){alert("Warning: no item with label 'always-bar' found.");return;}

/* current position
// in case don't exist
//difference
//save
*/
var contpos = [cont.getPositionX(),cont.getPositionY()];
var prev = JSON.parse(bar.getTag())||[0,0];
var d = [contpos[0]-prev[0],contpos[1]-prev[1]];
bar.setTag(JSON.stringify(contpos));


var barpos = [bar.getPositionX(),bar.getPositionY()];
var size = [-bar.getScaleX()*bar.getWidth(),-bar.getScaleY()*bar.getHeight()];
var sides = [horizontal,-vertical];
var screen = [cont.getWidth(),cont.getHeight()];


for(var j=0;j<=1;++j){

if(sides[j]==0)continue;
check=[0,size[j]];
if(sides[j]==1)check=[check[0]+screen[j],check[1]+screen[j]];

//up
if(d[j]>0 && barpos[j]>check[1]){
if(barpos[j]-d[j]*vh<check[1]){
barpos[j]=check[1];//bar.setPosition(posx,-size);
}else{
barpos[j]=barpos[j]-d[j]*vh;//bar.setPosition(posx,barpos-d*vh);
}
}

//down
if(d[j]<0 && barpos[j]<check[0]){
if(barpos[j]-d[j]*vs>check[0]){
barpos[j]=check[0];//bar.setPosition(posx,0);
}else{
barpos[j]=barpos[j]-d[j]*vs;//bar.setPosition(posx,barpos-d*vs);
}
}

}

bar.setPosition(barpos[0],barpos[1]);
</sxh>
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