Flex 4.5 移动设备在软键盘激活事件上使用动画调整文本区域大小？

Question

我使用 Flex 4.5.1 和 AIR 2.7（以及 Flash Builder 4.5.1）为 Blackberry Playbook 构建应用程序。

该应用程序有一个很大的文本区域，当软键盘显示时需要调整其大小。我能够连接到软键盘事件并在那里执行操作。

现在，我想在键盘显示时调整文本区域的大小以适合屏幕的其余部分。我知道当前和目标大小，并希望使用平滑的动画来显示文本区域的大小调整。 （我还无法设置高度，并且可以看到文本区域在键盘激活事件中正确调整大小 - 但我想通过动画来做到这一点）。我尝试过使用 Animate 类、spark.effects.Move 类，但在这种情况下它们似乎都不起作用。他们似乎运行动画，但屏幕没有刷新！

我不想在 ViewNavigatorApplication 上使用内置的 resizeAppForKeyboard 属性。我已在应用程序描述符中设置为“无”，因此该部分没问题。

有什么想法/想法吗？我的方法完全正确吗？如何在键盘激活事件中使用动画来调整文本区域的大小？我的代码如下所示：

在主视图中（onCreationComplete 事件）：（txNote 是有问题的文本区域）

txNote.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_ACTIVATE, function(e:SoftKeyboardEvent):void {
    toggleEditMode(true);
});

txNote.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_DEACTIVATE, function(e:SoftKeyboardEvent):void {
    toggleEditMode(false);
});

private function toggleEditMode(keyboardActivated:Boolean):void {
    trace("toggle edit: " + editMode + ", kb activating: " + keyboardActivated + ", txNote height = " + txNote.height);

    editMode = keyboardActivated;

    //we handle resize manually, because we want a nice animation happening and we want to resize only the text area - nothing else.
    var y:Number = editMode ? -38 : 0;
    var height:Number = editMode ? 218 : 455;
    txNote.moveAndSize(y, height);
}

txNote.moveAndSize 中的代码：

public function moveAndSize(newY:Number, newHeight:Number):void {

//parent group uses BasicLayout
//(this.parent as Group).autoLayout = false;
//resizePath.valueFrom = this.height;
//resizePath.valueTo = newHeight;

//movePath.valueFrom = this.y;
//movePath.valueTo = newY;

//resizeEffect.heightFrom = this.height;
//resizeEffect.heightTo = height;

    this.top = newY;
    moveEffect.xFrom = this.x;
    moveEffect.xTo = this.x;

    moveEffect.yFrom = this.y;
    moveEffect.yTo = newY;

    moveEffect.end();
    moveEffect.play([ this ]);

    //this.move(x, newY);
    //animate.play([ this ]);

    //this.height = height;
    //this.y = y;

    //setLayoutBoundsSize(width, height);
    //setLayoutBoundsPosition(x, y);
}

我尝试的 moveEffect / movePath / animate 各种内容在 txNote 构造函数中设置如下：

public class NotesArea extends TextArea {
//      private var animate:Animate;
//      private var movePath:SimpleMotionPath;
//      private var resizePath:SimpleMotionPath;

        private var moveEffect:Move;
//      private var resizeEffect:Resize;

        public function NotesArea() {
            super();

//          animate = new Animate();
//          var paths:Vector.<MotionPath> = new Vector.<MotionPath>();
//          movePath = new SimpleMotionPath("top");
//          resizePath = new SimpleMotionPath("height");
//          paths.push(movePath);
            //paths.push(resizePath);

//          animate.duration = 300;
//          animate.motionPaths = paths;

//          animate.addEventListener(EffectEvent.EFFECT_UPDATE, function(e:EffectEvent):void {
//              trace("y = " + y);
//              invalidateDisplayList();
//          });
//          animate.addEventListener(EffectEvent.EFFECT_END, function(e:EffectEvent):void {
//              trace("EFFECT ended: y = " + y);
//          });

            moveEffect = new Move();
            moveEffect.duration = 250;
            moveEffect.repeatCount = 1;
            moveEffect.addEventListener(EffectEvent.EFFECT_END, function (e:EffectEvent):void {
                //(this.parent as Group).autoLayout = true;
                trace("move effect ran. y = " + y + ", top = " + top);
            });

            //this.setStyle("moveEffect", moveEffect);
//
//          resizeEffect = new Resize();
//          resizeEffect.duration = 250;
//          this.setStyle("resizeEffect", resizeEffect);
        }

}

Answer 1

yourTextField.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_DEACTIVATE, onActivating);
yourTextField.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_ACTIVATING, onActivating); 
yourTextField.addEventListener(SoftKeyboardEvent.SOFT_KEYBOARD_ACTIVATE, onActivating); 

// in the event listener to the textField IE : 

private function onActivating(event:SoftKeyboardEvent):void 
{
  //listen to the event; make your move here.
}