<!--
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
    	  
  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an
  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  KIND, either express or implied.  See the License for the
  specific language governing permissions and limitations
  under the License.
  
-->
<library>

    <include href="incubator/baseedittext.lzx" />
    <include href="lz/vscrollbar.lzx"/>

    <!--- Implements visual baseedittext with scrollbar. -->
    <class name="scrolledittext" extends="baseedittext" 
           multiline="true" clip="true" height="100">

        <attribute name="border" value="0" />
        
        <view name="_face" bgcolor="0xffffff" 
              width="${parent.width-parent.border*2}" 
              height="${parent.height-parent.border*2}" 
              x="${parent.border}" y="${parent.border}"/>

        <_newinternalinputtext name="inp" 
            x="${parent.border}" 
            y="${parent.border}" 
            height="${parent.height - parent.border * 2}" 
            width="${parent.width - parent.vscrollwidth - parent.border*2}"
            scrollevents="true">
            <!-- Supplied by lztext now
                attribute name="lineheight"
                       value="${this.getTextHeight()/this.getMaxScroll()}"/-->
            <attribute name="maxtextheight"
                       value="${this.lineheight * this.maxscroll}"/>
            <attribute name="maxheight" 
                       value="${this.height + this.maxtextheight}"/>
            <attribute name="pos" value="0" type="number"/>
            
            <setter name="pos" args="p">
                if (this.inited) {
                    var scroll = 1 - Math.floor(p / this.lineheight);
                    if (scroll !== this.scroll) {
                        this.setAttribute('scroll', scroll);
                        //Debug.info('pos', p, this.scroll)
                    }
                    this.pos = p;
                    if (this.onpos) this.onpos.sendEvent(p);
                }
            </setter>
            
            <handler name="onscroll" args="IGNORE_THIS_ARG">
                this.setAttribute('pos', -this.lineheight * (this.scroll - 1));
            </handler>
        </_newinternalinputtext>

        <!--- Width to give for scrollbar
              @keywords private -->
        <attribute name="vscrollwidth" value="0"/>
        
        <method name="setvscrollwidthfromvisibility" args="v">
            this.setAttribute("vscrollwidth", (v ? this._vs.width : 0));
        </method>
        
<!--
        <om_vscrollbar name="_vs" axis="y" scrollattr="pos"
            scrolltarget="parent.inp"
            x="${parent.width - this.width - parent.border + 1}" 
            stepsize="${parent.inp.lineheight}" 
            scrollmax="${parent.inp.scrollheight}">
        </om_vscrollbar>
-->

        <!--- Name of class to instantiate for vertical scroll bar.
              @keywords public -->
        <attribute name="vscrollbarclassname" type="string" value="vscrollbar"/>
        
        <!--- Our vertical scrollbar
              @keywords private -->
        <attribute name="_vs" value="null"/>
        
        <!--- @keywords private -->
        <method name="ensurevscrollbar">
            if (this['_vs'] == null) {
                var classname = this.vscrollbarclassname;
                if (classname == "") {
                    classname = "vscrollbar";
                }
                if ($debug) {
                    if (typeof(lz[classname]) == "undefined") {
                        Debug.warn("scrollbarclassname undefined", this);
                    }
                }
                if(typeof(lz[classname]) != "undefined"){
                    this._vs = new lz[classname](this, 
                                                 { axis: "y",
                                                   scrollattr: "pos",
                                                   scrollmax: "0",
                                                   scrolltarget: this.inp});
                                                   
                    var xDel = new lz.Delegate(this, 'updateX');
                    xDel.register(this['_vs'], 'onwidth');
                    xDel.register(this, 'onwidth');
                    xDel.register(this, 'onborder');
                    
                    new lz.Delegate(this, 'updateScrollMax', this.inp, 'onscrollheight');
                    new lz.Delegate(this, 'updateStepSize', this.inp, 'onlineheight');
                    // call once manually
                    this.updateX();
                    this.updateStepSize();
                }

            }
        </method>
        
        <method name="updateX" args="IGNORE_THIS_ARG = null">
            if(this['_vs']){
                this._vs.setAttribute("x", this.width - this._vs.width );
            }
        </method>
        
        <method name="updateStepSize" args="IGNORE_THIS_ARG = null">
            if(this['_vs']){
                this._vs.setAttribute("stepsize", this.inp.lineheight);
            }
        </method>
        
        <method name="updateScrollMax" args="IGNORE_THIS_ARG = null">
            if(this['_vs']){
                this._vs.setAttribute("scrollmax", this.inp.scrollheight);
            }
        </method>
        
        <method name="init">
            super.init();
            this.ensurevscrollbar();
            setvscrollwidthfromvisibility(this['_vs'] ? this._vs.visible : false);
            this.myDel = new lz.Delegate(this, "setvscrollwidthfromvisibility", this['_vs'], "onvisible");
        </method>

 <!--- Overrides a parent method which calculates y position for text
            in a way that doesn't make sense for this class. We just trap the 
            call and do nothing. This field is positioned in y by the constraint
            y=${parent.border}
            Note: although this method is a no-op, it still has to be declared,
            so the parent class's method does not get called on instances of 
            this class. 
        -->
        <method name="_placeTextY">
        </method>

    </class>

</library>
<!-- * X_LZ_COPYRIGHT_BEGIN ***************************************************
* Copyright 2006-2009 Laszlo Systems, Inc. All Rights Reserved.               *
* Use is subject to license terms.                                            *
* X_LZ_COPYRIGHT_END ****************************************************** -->
<!-- @LZX_VERSION@                                                         -->