用仿ActionScript的語法來寫html5－第六篇，TextField與輸入框-H5教程-PHP中文網

用仿ActionScript的語法來寫html5－第六篇，TextField與輸入框

一，對比
1,html5中
先看看在html5的canvas中的文字顯示

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);

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在html中輸入框就不用說了，需要用到input標籤

1	`<input type="text"` `id="myTextbox"` `/>`

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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);

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二,編寫js類別庫後的程式碼

//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);

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三,實作方法
文字顯示非常簡單，只需要建立一個LTextField類別和一個show方法就可以了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;  
   
   
        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));  
        }  
    }  
}

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程式碼不難理解，就是呼叫show方法的時候，把它畫在canvas上面而已，
關鍵就是輸入框，因為html中，輸入框是一個標籤，怎麼把這個標籤畫到canvas？或者說canvas可以直接實在輸入框？
這個我不太清楚，如果有高手知道的話，希望能告訴偶一聲，
我現在說一說我的做法，我是在textField是input的時候，先畫一個矩形方框，然後利用div，把textbox直接顯示在對應的位置上
我的html裡一開始只有下面程式碼

<!DOCTYPE html>  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<title>仿ActionScript测试-TextField</title>  
<script type="text/javascript" src="../legend/legend.js"></script>   
<script type="text/javascript" src="./js/Main.js"></script>   
</head>  
<body>  
<div id="mylegend">页面读取中……</div>  
</body>  
</html>

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然後，利用javascript寫入一個canvas和一個textbox，作為準備工作

LGlobal.object = document.getElementById(id);  
LGlobal.object.innerHTML=&#39;<div id="&#39; + LGlobal.id + &#39;_inittxt"
style="position:absolute;margin:0px 0px 0px 0px;width:&#39;+width+&#39;px;height:&#39;+height+&#39;px;">数据读取中……</div>&#39; +   
&#39;<div style="position:absolute;margin:0px 0px 0px 0px;z-index:0;">
<canvas id="&#39; + LGlobal.id + &#39;_canvas">您的浏览器不支持HTML5</canvas></div>&#39;+  
&#39;<div id="&#39; + LGlobal.id + &#39;_InputText" style="position:absolute;margin:0px 0px 0px 0px;z-index:10;display:none;">
<input type="text" id="&#39; + LGlobal.id + &#39;_InputTextBox" /></div>&#39;;  
   
   
LGlobal.canvasObj = document.getElementById(LGlobal.id+"_canvas");  
LGlobal.inputBox = document.getElementById(LGlobal.id + &#39;_InputText&#39;);  
LGlobal.inputTextBox = document.getElementById(LGlobal.id + &#39;_InputTextBox&#39;);  
LGlobal.inputTextField = null;

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一開始將textbox隱藏，然後的做法是，當點擊我畫的矩形方框的時候，將它顯示到矩形方框上面，然後當點擊其他地方的時候，把輸入的內容賦值給textField後隱藏textbox
具體做法不多說了，下面是完整的LTextField程式碼，或是你一會兒可以直接滑鼠右健看完整程式碼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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