内部コンテンツに基づいてリッチテキストボックスの高さを動的に調整する方法は？

Question

public class AutoResizeBox extends RichTextArea 
{ 
    public AutoResizeBox() 
    { 
     set(getElement()); 
    } 

    public static native void set(Element f) /*-{ 
     console.log(f.tagName) ; 
     // console.log(f.document.body.scrollHeight + 'px'); 
    }-*/; 
} 

---

リッチテキストボックスを "IFRAME" を出力しますが、「にconsole.log（f.document IFRAME、Iはコードの上JSNI.Forを使用しようと、 "にconsole.log（f.tagName）" に基づいています.body.scrollHeight + 'px'）; " " com.google.gwt.core.client.JavaScriptException：（TypeError）：f.documentが未定義です"、誰かが私に理由を教えてくれる？

Answer 1

フェラは働いていたバージョン

import com.google.gwt.dom.client.BodyElement; 
import com.google.gwt.event.dom.client.BlurEvent; 
import com.google.gwt.event.dom.client.BlurHandler; 
import com.google.gwt.event.dom.client.ClickEvent; 
import com.google.gwt.event.dom.client.ClickHandler; 
import com.google.gwt.user.client.DOM; 
import com.google.gwt.user.client.Event; 
import com.google.gwt.user.client.ui.RichTextArea; 
import com.google.inject.Inject; 

public class AutoResizeTextArea extends RichTextArea implements ClickHandler, 
    BlurHandler 
{ 
private static final int margin = 6; 
private BodyElement body; 
private String defaultText; 
private int minHeight = 25; 
private String title; 

@Inject 
public AutoResizeTextArea() 
{ 
    addBlurHandler(this); 
    addClickHandler(this); 
    setHeight(minHeight + "px"); 
    setStyleName("textArea"); 
    sinkEvents(Event.ONKEYUP | Event.ONKEYPRESS); 
} 

private void adjustHeight() 
{ 
    // NP remove blow will cause auto-grow doesn't work 
    if (body != null) 
    { 
     int offsetHeight = body.getOffsetHeight(); 
     if (offsetHeight != body.getClientHeight()) 
     { 
      int height = (offsetHeight < minHeight ? minHeight : offsetHeight); 
      boolean breaking = height > minHeight; 
      if (breaking) 
      { 
       height = height + margin * 2; 
      } 
      setHeight(height + "px"); 
     } 
    } 
} 

public void clean() 
{ 
    setText(defaultText); 
    setHeight(minHeight + "px"); 
    setBodyStyle(true); 
} 

@Override 
public String getHTML() 
{ 
    // AP RichTextArea.getHTML will return "<br>",even no html exists 
    // within it,report this issue to gwt team; 
    String html = super.getHTML(); 
    return html.equals("<br>") || html.equals(defaultText) ? "" : html; 
} 

@Override 
public String getText() 
{ 
    String text = super.getText(); 
    return text.equals(defaultText) ? "" : text; 
} 

@Override 
public void onBlur(BlurEvent event) 
{ 
    if (defaultText != null && "".equals(getText())) 
    { 
     setDefaultText(defaultText); 
     setBodyStyle(true); 
    } 
} 

@Override 
public void onBrowserEvent(Event event) 
{ 
    super.onBrowserEvent(event); 
    int eventType = DOM.eventGetType(event); 
    if (eventType == Event.ONKEYUP || eventType == Event.ONKEYPRESS) 
    { 
     adjustHeight(); 
    } 
} 

@Override 
public void onClick(ClickEvent event) 
{ 

    super.setText(null); 
    setBodyStyle(false); 
} 

private native void registerOnCut(BodyElement element) /*-{ 
    var that = this; 
    console.log("registerOnCut"); 
    element.oncut = $entry(function(event) { 
     that.@com.athena.client.ui.richtextbox.AutoResizeTextArea::adjustHeight()(); 
     return false; 
    }); 
    element.onpaste = $entry(function(event) { 
     that.@com.athena.client.ui.richtextbox.AutoResizeTextArea::adjustHeight()(); 
     return false; 
    }); 
}-*/; 

private void setBodyStyle(boolean useDefaultTextStyle) 
{ 
    if (body != null) 
    { 
     body.setAttribute( "style", 
          (useDefaultTextStyle ? "color: gray;font-style: italic;" : "") 
            + "word-wrap:break-word;overflow:hidden;margin: " 
            + margin 
            + "px;padding: 0;font-size: 13px;font-family: arial,\"Microsoft YaHei\", Verdana, Tahoma, Arial, STHeiTi,sans-serif, Simsun;"); 
    } 
} 

public void setDefaultText(String defaultText) 
{ 
    super.setText(this.defaultText = defaultText); 
} 


@Override 
public void setHTML(String html) 
{ 
    super.setHTML(html); 
    if (html == null || "".equals(html)) 
    { 
     setDefaultText(defaultText); 
    } 
    adjustHeight(); 
} 


public void setMinHeight(int minHeight) 
{ 
    setHeight((this.minHeight = minHeight) + "px"); 
} 

@Override 
public void setText(String text) 
{ 
    super.setText(text); 
    if (text == null || "".equals(text)) 
    { 
     setDefaultText(defaultText); 
    } 
} 

@Override 
public void setTitle(String title) 
{ 
    this.title = title; 
} 
} 

ある