dojo 九 effects dojo/_base/fx 和 dojo/fx

官方教程：Dojo Effects
这里讲学习一下dojo如何实现淡入、淡出、滑动等效果。
实现这些特殊的效果有两个包 dojo/_base/fx 和 dojo/fx。
dojo/_base/fx 中提供了一些基础的animation方法，如： animateProperty, anim, fadeIn, and fadeOut.
dojo/fx 中提供了一些高级的animation方法，如：chain, combine, wipeIn, wipeOut and slideTo。

淡入淡出
require(["dojo/_base/fx", "dojo/on", "dojo/dom", "dojo/domReady!"], function(fx, on, dom) {

        var fadeOutButton = dom.byId("fadeOutButton"),//淡出按钮
            fadeInButton = dom.byId("fadeInButton"),//淡入按钮
            fadeTarget = dom.byId("fadeTarget");//目标节点
 
        on(fadeOutButton, "click", function(evt){
            fx.fadeOut({ node: fadeTarget }).play();//淡出
        });
        on(fadeInButton, "click", function(evt){
            fx.fadeIn({ node: fadeTarget }).play();//淡入
        });
    });

在所有的方法中包含后面介绍的，都只有一个对象参数，这个对象中可包含多个属性，必不可少的一个属性就是node，为要实现效果的节点对象或id字符串。
在fadeOut/fadeIn方法中还有一个属性duration，持续的时间，默认为350ms。
这些animation方法将返回一animation对象，该对象包含一些方法：play, pause, stop, status, and gotoPercent，用来执行，暂停，停止，查看状态及执行到某种程度。

擦除
require(["dojo/fx", "dojo/on", "dojo/dom", "dojo/domReady!"], function(fx, on, dom) {

        var wipeOutButton = dom.byId("wipeOutButton"),
            wipeInButton = dom.byId("wipeInButton"),
            wipeTarget = dom.byId("wipeTarget");
 
        on(wipeOutButton, "click", function(evt){
            fx.wipeOut({ node: wipeTarget }).play();
        });
        on(wipeInButton, "click", function(evt){
            fx.wipeIn({ node: wipeTarget }).play();
        });
    });
同淡入淡出一样

滑动
require(["dojo/fx", "dojo/on", "dojo/dom", "dojo/domReady!"], function(fx, on, dom) {
        var slideAwayButton = dom.byId("slideAwayButton"),
            slideBackButton = dom.byId("slideBackButton"),
            slideTarget = dom.byId("slideTarget");
 
        on(slideAwayButton, "click", function(evt){
            fx.slideTo({ node: slideTarget, left: "200", top: "200" }).play();
        });
        on(slideBackButton, "click", function(evt){
            fx.slideTo({ node: slideTarget, left: "0", top: "100" }).play();
        });
    });
在slideTo方法的参数中，除了节点对象属性外，还有left和top两个属性，用来设置滑动到目的位置的坐标。

事件
require(["dojo/fx", "dojo/on", "dojo/dom-style", "dojo/dom", "dojo/domReady!"], function(fx, on, style, dom) {
         
        var slideAwayButton = dom.byId("slideAwayButton"),
            slideBackButton = dom.byId("slideBackButton"),
            slideTarget = dom.byId("slideTarget");
             
            on(slideAwayButton, "click", function(evt){
                // Note that we're specifying the beforeBegin as a property of the animation
                // rather than using connect. This ensures that our beforeBegin handler
                // executes before any others.
                var anim = fx.slideTo({
                    node: slideTarget,
                    left: "200",
                    top: "200",
                    beforeBegin: function(){
                         
                        console.warn("slide target is: ", slideTarget);
                         
                        style.set(slideTarget, {
                            left: "0px",
                            top: "100px"
                        });
                    }
                });
 
                // We could have also specified onEnd above alongside beforeBegin,
                // but it's just as easy to connect like so
                on(anim, "End", function(){
                    style.set(slideTarget, {
                        backgroundColor: "blue"
                    });
                }, true);
 
                // Don't forget to actually start the animation!
                anim.play();
            });
 
            on(slideBackButton, "click", function(evt){
                var anim = fx.slideTo({
                    node: slideTarget,
                    left: "0",
                    top: "100",
                    beforeBegin: function(){
                         
                        style.set(slideTarget, {
                            left: "200px",
                            top: "200px"
                        });
                    }
                });
 
                on(anim, "End", function(){
                    style.set(slideTarget, {
                        backgroundColor: "red"
                    });
                }, true);
 
                anim.play();
            });
    });

在实现动态效果的过程中会产生两个事件，一个是beforeBegin，在执行之前调用；一个是onEnd，在执行完后调用。
在上面的例子中可以看到，beforeBegin是作为参数对象中的一个方法来定义的；onEnd是作为animation对象的一个事件在on中定义的。

连锁反应
require(["dojo/_base/fx", "dojo/fx", "dojo/on", "dojo/dom", "dojo/domReady!"], function(baseFx, fx, on, dom) {
         
        var slideAwayButton = dom.byId("slideAwayButton"),
            slideBackButton = dom.byId("slideBackButton"),
            slideTarget = dom.byId("slideTarget");
             
        // Set up a couple of click handlers to run our chained animations
        on(slideAwayButton, "click", function(evt){
            fx.chain([
                baseFx.fadeIn({ node: slideTarget }),
                fx.slideTo({ node: slideTarget, left: "200", top: "200" }),
                baseFx.fadeOut({ node: slideTarget })
            ]).play();
        });
        on(slideBackButton, "click", function(evt){
            fx.chain([
                baseFx.fadeIn({ node: slideTarget }),
                fx.slideTo({ node: slideTarget, left: "0", top: "100" }),
                baseFx.fadeOut({ node: slideTarget })
            ]).play();
        });
         
    });
chain用来将多个animation动作连接起来按顺序执行，它的参数即是由不同animation方法返回的animation对象组成的数组，执行的顺序就是数组的先后顺序。

联合
require(["dojo/_base/fx", "dojo/fx", "dojo/on", "dojo/dom", "dojo/domReady!"], function(baseFx, fx, on, dom) {
         
        var slideAwayButton = dom.byId("slideAwayButton"),
            slideBackButton = dom.byId("slideBackButton"),
            slideTarget = dom.byId("slideTarget");
 
        // Set up a couple of click handlers to run our combined animations
        on(slideAwayButton, "click", function(evt){
            fx.combine([
                baseFx.fadeIn({ node: slideTarget }),
                fx.slideTo({ node: slideTarget, left: "200", top: "200" })
            ]).play();
        });
        on(slideBackButton, "click", function(evt){
            fx.combine([
                fx.slideTo({ node: slideTarget, left: "0", top: "100" }),
                baseFx.fadeOut({ node: slideTarget })
            ]).play();
        });
         
    });
combine方法是将多个animation动作联合起来同时执行实现一个完成的动态效果。其参数也是由不同animation方法返回的animation对象组成的数组。
posted @ 2013-11-09 18:02  JackGIS  阅读(486)  评论(0)    收藏  举报