用仿ActionScript的语法来编写html5——第六篇，TextField与输入框

用仿actionscript的语法来编写html5——第六篇，textfield与输入框

一，对比
1,html5中
首先看看在html5的canvas中的文字显示

var canvas = document.getElementById("myCanvas");    
var context = canvas.getContext("2d");    
context.font = "40pt Calibri";    
context.fillStyle = "#0000ff";  
context.fillText("文字测试!", 50, 150);

在html中输入框就不用说了，需要用到input标签

2,在as中

//文字显示  
var txt:TextField = new TextField();  
txt.text = "文字测试!";  
txt.x = 50;  
txt.y = 50;  
addChild(txt);  
//输入框  
var txt:TextField = new TextField();  
txt.type = TextFieldType.INPUT;  
txt.x = 50;  
txt.y = 50;  
addChild(txt);

二,编写js类库后的代码

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//文字显示  
var txt = new LTextField();  
txt.x = 100;  
txt.text = "TextField 测试";  
addChild(txt);  
//输入框  
var txt1 = new LTextField();  
txt1.x = 100;  
txt1.y = 50;  
txt1.setType(LTextFieldType.INPUT);  
addChild(txt1);

三,实现方法
文字显示非常简单，只需要建立一个LTextField类和一个show方法就可以了function LTextField(){

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var self = this;  
    self.objectindex = ++LGlobal.objectIndex;  
    self.type = "LTextField";  
    self.texttype = null;  
    self.x = 0;  
    self.y = 0;  
    self.text = "";  
    self.font = "utf-8";  
    self.size = "11";  
    self.color = "#000000";  
    self.textAlign = "left";  
    self.textBaseline = "middle";  
    self.lineWidth = 1;  
    self.stroke = false;  
    self.visible=true;  
}  
  
  
LTextField.prototype = {  
    show:function (cood){  
        if(cood==null)cood={x:0,y:0};  
        var self = this;  
        if(!self.visible)return;  
  
  
        LGlobal.canvas.font = self.size+"pt "+self.font;    
        LGlobal.canvas.textAlign = self.textAlign;  
        LGlobal.canvas.textBaseline = self.textBaseline;  
        LGlobal.canvas.lineWidth = self.lineWidth;    
  
  
        if(self.stroke){  
            LGlobal.canvas.strokeStyle = self.color;  
            LGlobal.canvas.strokeText(self.text,parseFloat(cood.x) + parseFloat(self.x),  
                parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));    
        }else{  
            LGlobal.canvas.fillStyle = self.color;  
            LGlobal.canvas.fillText(self.text,parseFloat(cood.x) + parseFloat(self.x),  
                    parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));  
        }  
    }  
}

代码不难理解，就是调用show方法的时候，把它画在canvas上面而已，
关键是输入框，因为html中，输入框是一个标签，怎么把这个标签画到canvas上？或者说canvas可以直接现实输入框？
这个我不太清楚，如果有高手知道的话，希望能告诉偶一声，
我现在说一说我的做法，我是在textField是input的时候，先画一个矩形方框，然后利用div，把textbox直接显示在相应的位置上
我的html里一开始只有下面代码

  
  
  
  
  
   
   
  
  
页面读取中……
  
  

然后，利用javascript写入一个canvas和一个textbox，作为准备工作

LGlobal.object = document.getElementById(id);  
LGlobal.object.innerHTML='
数据读取中……
' +   
'

您的浏览器不支持HTML5
'+  
'

';  
  
  
LGlobal.canvasObj = document.getElementById(LGlobal.id+"_canvas");  
LGlobal.inputBox = document.getElementById(LGlobal.id + '_InputText');  
LGlobal.inputTextBox = document.getElementById(LGlobal.id + '_InputTextBox');  
LGlobal.inputTextField = null;

一开始将textbox隐藏，然后的做法是，当点击我画的矩形方框的时候，将它显示到矩形方框上面，然后当点击其他地方的时候，把输入的内容赋值给textField后隐藏textbox
具体做法不多说了，下面是完整的LTextField代码，或者你一会儿可以直接鼠标右健看完整代码function LTextField(){

 var self = this;  
    self.objectindex = ++LGlobal.objectIndex;  
    self.type = "LTextField";  
    self.texttype = null;  
    self.x = 0;  
    self.y = 0;  
    self.text = "";  
    self.font = "utf-8";  
    self.size = "11";  
    self.color = "#000000";  
    self.textAlign = "left";  
    self.textBaseline = "middle";  
    self.lineWidth = 1;  
    self.stroke = false;  
    self.visible=true;  
}  
  
  
LTextField.prototype = {  
    show:function (cood){  
        if(cood==null)cood={x:0,y:0};  
        var self = this;  
        if(!self.visible)return;  
        if(self.texttype == LTextFieldType.INPUT){  
            self.inputBackLayer.show({x:self.x+cood.x,y:self.y+cood.y});  
            if(LGlobal.inputBox.name == "input"+self.objectindex){  
                LGlobal.inputBox.style.marginTop = (self.y+cood.y) + "px";  
                LGlobal.inputBox.style.marginLeft = (self.x+cood.x) + "px";  
            }  
        }  
        LGlobal.canvas.font = self.size+"pt "+self.font;    
        LGlobal.canvas.textAlign = self.textAlign;  
        LGlobal.canvas.textBaseline = self.textBaseline;  
        LGlobal.canvas.lineWidth = self.lineWidth;    
  
  
        if(self.stroke){  
            LGlobal.canvas.strokeStyle = self.color;  
            LGlobal.canvas.strokeText(self.text,parseFloat(cood.x) + parseFloat(self.x),  
                parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));    
        }else{  
            LGlobal.canvas.fillStyle = self.color;  
            LGlobal.canvas.fillText(self.text,parseFloat(cood.x) + parseFloat(self.x),  
                    parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));  
        }  
    },  
    setType:function(type){  
        var self = this;  
        if(self.texttype != type && type == LTextFieldType.INPUT){  
            self.inputBackLayer = new LSprite();  
            self.inputBackLayer.graphics.drawRect(1,"black",[0, 0, 150, 20],true,"#cccccc");  
            self.inputBackLayer.addEventListener(LMouseEvent.MOUSE_DOWN, function(){  
                if(self.texttype != LTextFieldType.INPUT)return;  
                LGlobal.inputBox.style.display = "";  
                LGlobal.inputBox.name = "input"+self.objectindex;  
                LGlobal.inputTextField = self;  
                LGlobal.inputTextBox.value = self.text;  
            });  
        }else{  
            self.inputBackLayer = null;  
        }  
        self.texttype = type;  
    },  
    mouseEvent:function (event,type,cood){  
        if(cood==null)cood={x:0,y:0};  
        var self = this;  
        if(self.inputBackLayer == null)return;  
        self.inputBackLayer.mouseEvent(event,type,{x:self.x+cood.x,y:self.y+cood.y});  
          
    }  
}

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