处理应用程序显示更改

在 AIR 中，可以通过将应用程序描述符中的 softKeyboardBehavior 元素设置为 none 来与关闭和开启软键盘相关的默认平移和调整大小行为。

<softKeyboardBehavior>none</softKeyboardBehavior>

在关闭自动行为后，由您的应用程序负责对应用程序显示的内容进行必要的调整。当打开键盘时将调度 softKeyboardActivate 事件。在调度 softKeyboardActivate 事件时，舞台的 softKeyboardRect 属性包含由打开的键盘覆盖的区域尺寸。使用这些尺寸来移动或调整内容的大小，以便在打开键盘和用户键入时正确显示内容。（当关闭键盘时，softKeyboardRect 矩形的尺寸全部为零。）

当关闭键盘时，会调度 softKeyboardDeactivate 事件，您可以将应用程序显示恢复成正常状态。

package  {        
    import flash.display.MovieClip; 
    import flash.events.SoftKeyboardEvent; 
    import flash.events.Event; 
    import flash.display.StageScaleMode; 
    import flash.display.StageAlign; 
    import flash.display.InteractiveObject; 
    import flash.text.TextFieldType; 
    import flash.text.TextField; 
     
    public class PanningExample extends MovieClip { 
                     
        private var textField:TextField = new TextField(); 
         
        public function PanningExample() {             
            this.stage.scaleMode = StageScaleMode.NO_SCALE; 
            this.stage.align = StageAlign.TOP_LEFT; 
             
            textField.y = this.stage.stageHeight - 201; 
            textField.width = this.stage.stageWidth; 
            textField.height = 200; 
            textField.type = TextFieldType.INPUT; 
            textField.border = true; 
            textField.wordWrap = true; 
            textField.multiline = true; 
             
            this.addChild( textField ); 
             
            //track soft keyboard and stage resize events 
            textField.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_ACTIVATE, onKeyboardChange ); 
            textField.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_DEACTIVATE, onKeyboardChange ); 
            this.stage.addEventListener( Event.RESIZE, onDisplayAreaChange ); 
        } 
     
        private function onDisplayAreaChange( event:Event ):void 
        { 
            textField.y = this.stage.stageHeight - 201; 
            textField.width = this.stage.stageWidth; 
        } 
         
        private function onKeyboardChange( event:SoftKeyboardEvent ):void 
        { 
            var field:InteractiveObject = textField; 
            var offset:int = 0; 
 
            //if the softkeyboard is open and the field is at least partially covered 
            if( (this.stage.softKeyboardRect.y != 0) && (field.y + field.height > this.stage.softKeyboardRect.y) ) 
                offset = field.y + field.height - this.stage.softKeyboardRect.y; 
                 
            //but don't push the top of the field above the top of the screen 
            if( field.y - offset < 0 ) offset += field.y - offset; 
             
            this.y = -offset;             
        }         
    } 
}

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