AS3 CookBook学习整理(七)
1. 调整文本框大小以适应内容
设置autoSize属性可自动根据内容调整文本框大小。可用值为RIGHT, LEFT, CENTER,和NONE，都是flash.text.TextFieldAutoSize类常量
默认值为NONE，表示不自动调整大小。 另外，wordWrap属性设置为true，则当内容超出范围时自动换行。貌似必须先设置autoSize才生效
package {
import flash.display.Sprite;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFieldType;
public class Sample0323 extends Sprite
{
public function Sample0323()
{
var text:TextField = new TextField();
text.type = TextFieldType.INPUT;
text.border = true;
text.borderColor = 0xFFFF00;
text.height = 20;
text.autoSize = TextFieldAutoSize.CENTER;
text.wordWrap = true;
this.addChild(text);
}
}
}2. 滚动文本
水平滚动的单位为像素(最小值为0)，垂直滚动的单位为行(最小值为1)。设置WheelEnabled=false可以禁用滚轮滚动行。
scrollH -- 水平滚动的像素
maxScrollH -- 文本的最大水平像素值，只读
scrollV -- 垂直滚动的行数
maxScrollV -- 文本的最大行数，只读
bottomScrollV -- 当前最后一行是第几行(在整个行数里)，只读
package {
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFieldType;
public class Sample0323 extends Sprite
{
private var textBox:TextField;
private var textInfo:TextField;
public function Sample0323()
{
textBox = new TextField();
textBox.type = TextFieldType.INPUT;
textBox.width = 250;
textBox.height = 100;
textBox.border = true;
textBox.borderColor = 0xFFFF00;
textBox.background = true;
textBox.backgroundColor = 0xFFFFFF;
//测试水平滚动则为false,垂直滚动则为true;
textBox.wordWrap = true;
this.addChild(textBox);
var label:TextField = new TextField();
label.x = 200;
label.y = 100;
label.background = true;
label.backgroundColor = 0xCCCCCC;
label.autoSize = TextFieldAutoSize.CENTER;
label.text = "水平滚动10个像素";
label.addEventListener(MouseEvent.CLICK,scrollH_onClick);
this.addChild(label);
label = new TextField();
label.x = 200;
label.y = 150;
label.background = true;
label.backgroundColor = 0xCCCCCC;
label.autoSize = TextFieldAutoSize.CENTER;
label.text = "水平滚动至结尾";
label.addEventListener(MouseEvent.CLICK,maxScrollH_onClick);
this.addChild(label);
label = new TextField();
label.x = 200;
label.y = 200;
label.background = true;
label.backgroundColor = 0xCCCCCC;
label.autoSize = TextFieldAutoSize.CENTER;
label.text = "垂直滚动3行";
label.addEventListener(MouseEvent.CLICK,scrollV_onClick);
this.addChild(label);
label = new TextField();
label.x = 200;
label.y = 250;
label.background = true;
label.backgroundColor = 0xCCCCCC;
label.autoSize = TextFieldAutoSize.CENTER;
label.text = "垂直滚动至结尾";
label.addEventListener(MouseEvent.CLICK,maxScrollV_onClick);
this.addChild(label);
textInfo = new TextField();
textInfo.type = TextFieldType.INPUT;
textInfo.y = 300;
textInfo.autoSize = TextFieldAutoSize.CENTER;
this.addChild(textInfo);
}
private function scrollH_onClick(event:MouseEvent):void
{
textBox.scrollH += 10;
}
private function maxScrollH_onClick(event:MouseEvent):void
{
textBox.scrollH = textBox.maxScrollH;
}
private function scrollV_onClick(event:MouseEvent):void
{
textBox.scrollV += 3;
textInfo.text = "当前最后一行在整个行数里是第"+textBox.bottomScrollV+"行";
}
private function maxScrollV_onClick(event:MouseEvent):void
{
textBox.scrollV = textBox.maxScrollV;
}
}
}3. 响应滚动事件
当水平或垂直滚动产生时会触发scroll事件，flash.events.Event类的SCROLL常量即代表该事件
package {
import flash.display.Sprite;
import flash.events.Event;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFieldType;
import flash.utils.getTimer;
public class Sample0323 extends Sprite
{
private var textBox:TextField;
private var textInfo:TextField;
public function Sample0323()
{
textBox = new TextField();
textBox.type = TextFieldType.INPUT;
textBox.width = 250;
textBox.height = 100;
textBox.border = true;
textBox.borderColor = 0xFFFF00;
textBox.background = true;
textBox.backgroundColor = 0xFFFFFF;
textBox.wordWrap = true;
textBox.addEventListener(Event.SCROLL,onScroll);
this.addChild(textBox);
textInfo = new TextField();
textInfo.type = TextFieldType.INPUT;
textInfo.y = 300;
textInfo.autoSize = TextFieldAutoSize.CENTER;
this.addChild(textInfo);
}
private function onScroll(event:Event):void
{
textInfo.text = flash.utils.getTimer()+" -- 滚动了";
}
}
}4. 格式化文本框文本
有三种方式对文本进行格式化：HTML标签格式化、使用TextFormat对象、CSS样式
* HTML标签格式化示例： textBox.htmlText = "<B>粗体文本</B><U>下划线文本</U>";
* TextFormat对象示例：(注意：只对setTextFormat之前的代码有效)
var textFormat:TextFormat = new TextFormat();
textFormat.color = 0xFF0000;
textFormat.htmlText = "有效";
//也可以对部分文字进行格式化，例如:textBox.setTextFormat(textFormat,3,textBox.text.length);
textBox.setTextFormat(textFormat); textFormat.htmlText = "无效";
* CSS样式示例：(注意：只对CSS定义之后的代码有效)
var css:StyleSheet = new StyleSheet();
var styleObj:Object = {color:"#FF0000"};
css.setStyle(".stdStyle",styleObj);
textBox.styleSheet = css;
textBox.htmlText = "不潮不用花钱";
this.addChild(textBox);
package {
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.text.StyleSheet;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
public class Sample0324 extends Sprite
{
private var label:TextField;
private var text:String = "here comes <span class='stdText'>wayne</span>";
public function Sample0324()
{
var btnRed:TextField = new TextField();
btnRed.text = "应用红色样式";
btnRed.y = 100;
btnRed.addEventListener(MouseEvent.CLICK,onRedClick);
this.addChild(btnRed);
var btnGreen:TextField = new TextField();
btnGreen.text = "应用绿色样式";
btnGreen.y = 200;
btnGreen.addEventListener(MouseEvent.CLICK,onGreenClick);
this.addChild(btnGreen);
label = new TextField();
label.autoSize = TextFieldAutoSize.CENTER;
label.htmlText = text;
this.addChild(label);
}
private function onRedClick(event:MouseEvent):void
{
var loader:URLLoader = new URLLoader();
loader.load(new URLRequest("StdStyle.css"));
loader.addEventListener(Event.COMPLETE,onLoadComplete);
}
private function onGreenClick(event:MouseEvent):void
{
var loader:URLLoader = new URLLoader();
loader.load(new URLRequest("StdStyle2.css"));
loader.addEventListener(Event.COMPLETE,onLoadComplete);
}
private function onLoadComplete(event:Event):void
{
var css:StyleSheet = new StyleSheet();
css.parseCSS((event.target as URLLoader).data);
label.styleSheet = css;
label.htmlText = text;
}
}
}5. 格式化用户输入的文本
应用TextFormat对象到文本框的defaultTextFormat属性上
package {
import flash.display.Sprite;
import flash.text.TextField;
import flash.text.TextFieldType;
import flash.text.TextFormat;
public class Sample0324 extends Sprite
{
public function Sample0324()
{
var textBox:TextField = new TextField();
textBox.type = TextFieldType.INPUT;
textBox.border = true;
textBox.borderColor = 0xFFFF00;
var textFormat:TextFormat = new TextFormat();
textFormat.color = 0xFF0000;
textFormat.italic = true;
textBox.defaultTextFormat = textFormat;
this.addChild(textBox);
}
}
}6. 设置文本字体
使用HTML的标签，或者设置TextFormat对象的font属性，或者通过CSS的font-family属性
修改字体有多种方法，如果使用HTML的话可通过 标签更改：field.htmlText = "Formatted text";
也可设置TextFormat对象的font属性：formatter.font = "Arial";
或者在CSS中定义font-family 属性：p {font-family: Arial;}
需要注意的是电脑中必须要有你所指定的字体，因为有些电脑上可能没有安装相应的字体，这是可指定多种字体：formatter.font = "Arial, Verdana, Helvetica";
如果都没有指定字体，默认使用系统字体。
另外我们还可使用字体组，字体组是系统默认字体的一个分类，有三种： _sans, _serif, 和_typewriter。
_sans 组包含如Arial 或Helvetica，_serif组包含如Times 或Times New Roman，_typewriter 组包含如Courier 或Courier New
7. 嵌入字体
通过[embed]元数据嵌入字体，设置文本框的embedFonts属性为true，通过标签，TextFormat对象或CSS应用字体
嵌入系统字体:
[Embed(systemFont="Onyx",fontName="hxw",mimeType="application/x-font-truetype")]
嵌入非系统字体:
[Embed(source="xjlFont.fon",fontName="xjl",mimeType="application/x-font")]
可以设置textField.rotation += 30来设置文字旋转(放在定时器或OnEnterFrame事件里)，文字必须为嵌入字体，否则无法正常显示。
TextFormat方式
package {
import flash.display.Sprite;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFormat;
[Embed(source="xjlFont.fon",fontName="xjl",mimeType="application/x-font-truetype")]
public class Sample0410 extends Sprite
{
public function Sample0410()
{
var textBox:TextField = new TextField();
textBox.text = "hello everybody,my name is 老胡";
textBox.autoSize = TextFieldAutoSize.CENTER;
textBox.embedFonts=true;
addChild(textBox);
var formatter:TextFormat = new TextFormat();
formatter.font = "xjl";
formatter.size = 30;
textBox.setTextFormat(formatter);
}
}
}CSS方式
package {
import flash.display.Sprite;
import flash.text.StyleSheet;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
[Embed(source="xjlFont.fon",fontName="xjl",mimeType="application/x-font-truetype")]
public class Sample0410 extends Sprite
{
public function Sample0410()
{
var css:StyleSheet = new StyleSheet();
var styleObj:Object = {color:"#FFFF00", fontFamily:"xjl",fontSize:"30px"};
css.setStyle(".stdStyle",styleObj);
var textBox:TextField = new TextField();
textBox.styleSheet = css;
textBox.text = "<span class='stdStyle'>hello everybody,my name is 老胡</span>";
textBox.autoSize = TextFieldAutoSize.CENTER;
textBox.embedFonts=true;
addChild(textBox);
}
}
}8. 设置焦点
设置stage.focus = xxx来设置舞台的焦点,stage.focus = null可以移除焦点
package {
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.text.TextField;
import flash.text.TextFieldType;
public class Sample0410 extends Sprite
{
public function Sample0410()
{
var field:TextField = new TextField( );
field.border = true;
field.background = true;
field.type = TextFieldType.INPUT;
addChild(field);
stage.addEventListener(MouseEvent.CLICK,onClick);
}
private function onClick(event:MouseEvent):void
{
stage.focus = getChildAt(0) as TextField;
//this.removeEventListener(MouseEvent.CLICK,onClick);
}
}
}9. 选中TextField的部分文本及设置光标所在位置
设置TextField.setSelection(startIndex,endIndex)，同时通过selectionBeginIndex和selectionEndIndex两个只读属性可获得选中文本的具体位置
如果设置setSelection的两个参数相同，则是在设置光标所在位置，通过TextField.caretIndex属性可以得到当前光标所在位置
package {
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFieldType;
public class Sample0410 extends Sprite
{
private var lblNumber:TextField;
public function Sample0410()
{
var field:TextField = new TextField( );
field.border = true;
field.background = true;
field.type = TextFieldType.INPUT;
field.text = "我们的祖先在护佑着你";
this.addChild(field);
lblNumber = new TextField();
lblNumber.autoSize = TextFieldAutoSize.CENTER;
lblNumber.background = true;
lblNumber.y = 150;
this.addChild(lblNumber);
field.addEventListener(MouseEvent.CLICK,onClick);
}
private function onClick(event:MouseEvent):void
{
var textBox:TextField = event.target as TextField;
textBox.setSelection(5,5);
var strStart:String = "起始点："+textBox.selectionBeginIndex.toString();
var strEnd:String = "结束点："+textBox.selectionEndIndex.toString();
var currentIndex:String = "当前光标所在："+textBox.caretIndex;
lblNumber.text = strStart + "," + strEnd + "," + currentIndex;
}
}
}10. 取消事件的默认行为(如果可以取消)
默认情况下，许多事件都有Flash Player执行的关联行为。例如，如果用户在文本字段中键入一个字符，则默认行为就是在文本字段中显示该字符。可以使用preventDefault()方法来防止显示该字符
然后很多事件是瞬发的，像点击事件、获得焦点、失去焦点事件
可以使用Event.cancelable属性来判断是否可以取消行为，如果返回true，则可以使用preventDefault()来取消事件；否则preventDefault()无效
package {
import flash.display.Sprite;
import flash.events.FocusEvent;
import flash.events.MouseEvent;
import flash.text.TextField;
import flash.text.TextFieldType;
public class Sample0410 extends Sprite
{
public function Sample0410()
{
//演示MouseEvent.Click事件是无法取消行为的
stage.addEventListener(MouseEvent.CLICK,onClick);
//演示FocusEvent.FOCUS_IN事件是无法取消行为的
var textBox:TextField = new TextField();
textBox.type = TextFieldType.INPUT;
textBox.background = true;
textBox.addEventListener(FocusEvent.FOCUS_IN,onFocusIn);
this.addChild(textBox);
//演示FocusEvent.MOUSE_FOCUS_CHANGE事件是可以取消行为的
textBox.addEventListener(FocusEvent.MOUSE_FOCUS_CHANGE,onMouseFocusChange);
}
private function onClick(event:MouseEvent):void
{
trace("MouseEvent.Click事件可以取消行为吗？" + event.cancelable);//显示false
}
private function onFocusIn(event:FocusEvent):void
{
trace("FocusEvent.FOCUS_IN事件可以取消行为吗？" + event.cancelable);//显示false
}
private function onMouseFocusChange(event:FocusEvent):void
{
trace("FocusEvent.MOUSE_FOCUS_CHANGE事件可以取消行为吗？" + event.cancelable);//显示true
}
}
}
