CSS3 transition

CSS3 transition poate fi utilizat pentru a anima proprietatile CSS, adaugand un efect de animatie cand se modifica proprietatile CSS ale unui element HTML, schimband gradual de la un stil la altut.
CSS3 transition are 4 componente:

• transition-property - Specifica numele proprietatii (sau proprietatilor) la care transition trebuie aplicat (precum: width, color, font-size, etc.).
        CSS3 transition poate fi utilizat cu proprietatile prezentate aici: Proprietati CSS ce pot fi animate
• transition-duration - Specifica durata tranzitiei (animatiei), in sesunde (s), milisecunde (ms), (implicit 0).
• transition-timing-function - Defineste tipul vitezei efectului in timpul transformarii:
        ease (implicit), linear, ease-in, ease-out, ease-in-out
• transition-delay - Defineste timpul de asteptare pana cand incepe efectul "transition" (implicit 0)

Pentru a folosi CSS3 transition, trebuie specificate aceste doua lucruri:
      1. Proprietatea CSS la care se aplica efectul ( transition-property ).
      2. Durata efectului ( transition-duration ).
- Ultimele doua componente ( transition-timing-function si transition-delay ) sunt optionale.
- Internet Explorer recunoaste "CSS3 transition" incepand cu IE 10.

Exemplu. Cand mouse-ul e deasupra unui anumit Div, se schimba gradual lungimea.

<style type="text/css"> 
#iddv {
 width:80px;
 height:80px;
 background:#b8b9fe;
 font-size:17px;
 transition-property: width;  
 transition-duration: 1.4s;

/* Firefox 4 */ 
 -moz-transition-property: width;
 -moz-transition-duration: 1.4s;
/* Safari si Chrome */ 
 -webkit-transition-property: width;
 -webkit-transition-duration: 1.4s;
/* Opera */
  -o-transition-property: background-color, color;  
  -o-transition-duration: 1.4s;
}

#iddv:hover {
 width:200px;
}
</style>

<div id="iddv">Pozitionati mouse-ul pe acest patrat.</div>

Demo (Cand cursorul mouse-ului iese din zona elementului, revine gradual la stilul initial):

Proprietatea transition prescurtata

Se pot adauga toate cele 4 componente intr-o singura proprietate transition.
Sintaxa:

transition: transition-property transition-duration transition-timing-function transition-delay;

Exemplu: Schimba gradual "font-size" (in 0.4 secunde, cu viteza "ease-out") cand mouse-ul e deasupra unui element cu class="clse".

<style type="text/css"> 
.clse {
 width:150px;
 font-size:13px;
 transition: font-size 0.4s ease-out; 
 -moz-transition: font-size 0.4s ease-out;  /* Firefox 4 */ 
 -webkit-transition: font-size 0.4s ease-out;  /* Safari si Chrome */
  -o-transition: font-size 0.4s ease-out;  /* Opera */
}

.clse:hover {
 font-size: 16px;
}
</style>

<ul>
 <li class="clse"><a href="http://www.discant.ro/curs_css/" title="Curs CSS ">Curs CSS </a></li>
 <li class="clse"><a href="http://www.discant.ro/html/" title="Curs HTML">Curs HTML</a></li>
 <li class="clse"><a href="http://www.discant.ro/" title="Cursuri Programare Web">Cursuri Programare Web</a></li>
</ul>

Demo {plasati cursorul deasupra fiecarui link}:
• Se pot adauga mai multe proprietati pt efect "transition" intr-o singura definitie, separate prin virgula.
Exemplu. Adaugare efect la: background, opacity si transform:

<style type="text/css"> 
.dv1 {
 width:115px;
 height:100px;
 position:relative;
 font-size:17px;
 text-align:center;
 padding-top:18px;
}

.clsdv {
 width:120px;
 height:100px;
 position:absolute;
 top:0;
 left:0;
 background:#b8b9fe;
 transition: background 1.3s, opacity 1.8s, transform 1.4s; 
 -moz-transition: background 1.3s, opacity 1.8s, -moz-transform 1.4s;  /* Firefox 4 */ 
 -webkit-transition: background 1.3s, opacity 1.8s, -webkit-transform 1.4s;  /* Safari si Chrome */
  -o-transition: background 1.3s, opacity 1.8s, -o-transform 1.4s;  /* Opera */
}

.clsdv:hover {
 background: #00da01;
 filter:alpha(opacity=50);     /* pt IE */
 opacity:0.5;
 transform:rotate(180deg);
 -moz-transform:rotate(180deg); /* Firefox 4 */
 -webkit-transform:rotate(180deg); /* Safari si Chrome */
 -o-transform:rotate(180deg); /* Opera */
}
</style>

Puneti mouse-ul deasupra acestui dreptunghi.
<div class="dv1">
 <div class="clsdv"></div>
 Text oarecare, ascuns
</div>

Demo:

Proprietati CSS ce pot fi animate

Lista cu proprietati CSS care pot fi utilizate in transition:

- Proprietati pt text:   color, font-size, font-weight, letter-spacing, line-height, text-indent, text-shadow, vertical-align, word-spacing.
- Proprietati pt elemente tip bloc:   background, background-color, background-image, background-position, border-left-color etc., border-spacing, border-left-width etc., clip, crop, height, min-height, max-height, margin-left etc., opacity, outline-width, outline-offset, outline-color, padding-left etc., width, min-width, max-width.
- Proprietati de pozitionare:   bottom, top, left, right, grid-, visibility, z-index, zoom .