Re: [Dynapi-Dev] My options on ScrollBar Light

[Doug M. <do...@cr...>]

1) The naming convention is certainly up for debate.
This is one of the things we would want to cover in
a widget standard.

2) Point taken, will do.

3) anchors hadn't even occured to me..
    I will most certainly implement them.

3b) (maybe ment 4? :-) )  I'm afranid I found the range method of doing
thing in VB very diffuclt.
        It would really mess up my math if I had to resize something.
    Wheras the ratio is simple the percentage of total possible scrolling.
    It may be debated, but I personally like the simplicity of the math
involved.

As for the arrows, I agree.. Will do.


> Hi Everyone,
>
> (The views expressed below are my own and are not
> intented to hurt anyone. I'm just expressing things as
> I see them in my option)
>
>
> 1) First off - In keeping with naming conventions I
> would add the prefix btn before buttons (e.g btnUp,
> btnDown,etc). This is something that I've learned will
> coding in vb. The truth is this is of little value but
> it's just my option.


> 2) The this.KnobListener should not be created inside
> the constructor. This IMO is a performance hit as the
> javascript engine will have to create an object and a
> function for each scrollbar. IMO it should be placed
> on the prototype of the scrollbar:
>
> function scrollbar_light(){
>    // code here...
>    this.knob.addEventListener(this.KnobListener);
> };
> scrollbar_light.prototype.KnobListener={
>   // events here
> };
>
> The same should go for the other events. In this
> approach the functions and objects are created only
> once.



> 3) Instead of reseting the sizes of the buttons by
> calling setSize inside the allignObjects() functions I
> would recommend that the setAnchor() function be used.
> You just set it and forget it:
>
> // inside constructor
> if (this.orientation) { //vertical
>    var al={left:0,right:0};
>    this.upBTN.setAnchor(al);
>    this.downBTN.setAnchor(al);
>    this.knob.setAnchor(al);
> }else { //horizontal
>    var al = {top:0,bottom:0};
>    this.upBTN.setAnchor(al);
>    this.downBTN.setAnchor(al);
>    this.knob.setAnchor(al);
> }
>
> For a very good example of anchoring/strecthing see
> dynapi.api.dynlayer-anchor-stretching.html and
> dynapi.api.dynlayer-anchor.html
>
> The same can be down for the knob by using the
> stretchV and stretchH attributes. for example:
> stretchV:'40%' can be used to stretch the knob '40%'
> of it's parent width or stretchV:90 will set the
> knob's height to 90 pixels
>
> 3) I've found the scrollbar from dynapi 2.x days to be
> very difficult to use. I never liked the setRatio()
> and getRatio() functions. I think the the simplicity
> of the Visual Basic scrollbar is much prefered than
> setRatio().
>
> I think the scrollbar should have a setRange(min,man)
> function that allows me to set a range of values to
> scroll. I can then use getValue() and setValue()
> functions to set or get the value of the scrollbar.
> When I call setValue(v) it will force the scrollbar
> knob to move to the section where the value can be
> found.
>
> example:
>
> hscBar.setRange(0,1000);
> hscBar.setValue(120); // simulates a user scroll
> // ^ set knob to value 120 within the range 0-1000
> // some code here.....
> var v = hscBar.getValue();
>
> That's it!
>
> Well in summary I think the scrollbar looks good, but
> I'd like it better if it had arrows :).
> Since this is the light version I would suggest that
> you use ←, →, ↑, ↓ or + - to
> indicate up/down or left/right.
>
> Keep up the good work.
>
> Best regards.
>
> --
> Raymond Irving
>
>
>
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