albumlayout.lzx

<!--
* X_LZ_COPYRIGHT_BEGIN ****************************************************
* Copyright 2001-2006, 2008 Laszlo Systems, Inc.  All Rights Reserved.          *
* Use is subject to license terms.                                        *
* X_LZ_COPYRIGHT_END ******************************************************-->
<library>
    <class name="albumlayout" extends="layout">
        <!--- The primary axis for wrapping. -->
        <attribute name="axis" value="x" setter="this.setAxis( axis )" type="string"/>
        <!--- A pixel amount to use between the views controlled by the layout in
              both axes. By default, both xspacing and yspacing are set to this
              value. -->
        <attribute name="spacing" value="1"/>
        <!--- A pixel amount to offset the first view controlled by the layout in x
              axis -->
        <attribute name="xinset" value="0"/>
        <!--- A pixel amount to offset the first view controlled by the layout in y
              axis -->
        <attribute name="yinset" value="0"/>
        <!--- A pixel amount to use between the views controlled by the layout in
              the x axis. -->
        <attribute name="xspacing" value="${this.spacing}"/>
        <!--- A pixel amount to use between the views controlled by the layout in
              the y axis. -->
        <attribute name="yspacing" value="${this.spacing}"/>
        <!--- If given, a number of miliseconds to use to animate the views in to
              place.-->
              
        <attribute name="photoscale" value="1"/>
        <attribute name="photodimension" value="70"/>

        <attribute name="skew" value="0"/>
        <attribute name="skewindex" value="1"/>

        <attribute name="isgrid" value="true"/>


        <attribute name="duration" value="0"/>
        <!--- @keywords private -->
        <method name="setAxis" args="a">
            <!-- CURRENTLY THIS METHOD IS NOT USED -->
            this.axis = a;
            this.otherAxis =  a == "x" ? "y" : "x"
            this.sizeAxis = a == "x" ? "width" : "height"
            this.otherSizeAxis = a == "x" ? "height" : "width"
        </method>
    
        <!--- @keywords private -->
        <method name="addSubview" args="newsub">
            this.updateDelegate.register( newsub,  'onwidth');
            this.updateDelegate.register( newsub,  'onheight');
            this.updateDelegate.register( this.immediateparent,  'onwidth');
            this.updateDelegate.register( this,  'onphotoscale');
            this.updateDelegate.register( this,  'onyspacing');
            this.updateDelegate.register( this,  'onxspacing');
            this.updateDelegate.register( this,  'onskew');
            super.addSubview( newsub );
            this.update();
       </method>
    
        <!--- This method is usually called automatically when any of the views
              controlled by the layout change their size , or when the size of
              layout's immediateparent changes. However it can be called directly
              to force the layout to update -->
       <method name="update" args="ignore=null">
            
            if ( this.locked ) return;
            this.locked = true;
            //Debug.write("layout update");
  

            var l = this.subviews.length;
            var limit = this.immediateparent[this.sizeAxis];
            var rowindex = 0;
            var leftlimit = (rowindex - skewindex)*skew*limit;
            var rightlimit = leftlimit + limit;
    
            // position along this.axis
            var pos = this[this.axis + 'inset'] + leftlimit;
            // position along this.otherAxis
            var otherpos = this[this.otherAxis + 'inset'];
            var maxdimension = 0;
            var space = this[this.axis + 'spacing'];    // spacing in axis dimension
            var otherspace = this[this.otherAxis + 'spacing'];    // spacing in other axis dimension
    
            
            for(var i=0; i < l; i++) {
                // get subview
                var s = this.subviews[i]; // get subview
                
                // set position of subview
                s.setAttribute(this.axis,pos); // set position
                s.setAttribute(this.otherAxis,otherpos);
                
                // set width and height of subview
                s.setAttribute('width', Math.round(photodimension*photoscale));
                s.setAttribute('height', Math.round(photodimension*photoscale));
                
                // adjust next position by dimension of previous subview
                pos += s[this.sizeAxis];
                if ( i < (l - 1)) {
                    pos += space; //add spacing between last subview
                    
                    maxdimension = Math.max(maxdimension,s[this.otherSizeAxis]);
                    
                    if (( pos > rightlimit) ||
                        (pos + this.subviews[i+1][this.sizeAxis] >  rightlimit)) {
                        // need to create a new row so ...
                        rowindex += 1;
                        leftlimit = (rowindex - skewindex)*skew*limit;
                        rightlimit = leftlimit + limit;
                        pos = this[this.axis + 'inset'] + (rowindex - skewindex)*skew*limit;
                        otherpos += maxdimension + otherspace;
                        maxdimension = 0;   // Reset the height/width after every row/column                    
                    }
                }
    
    
            }
            this.locked = false;
            
        </method>
        <!--- @keywords private -->
        <method name="toString">
             return 'wrappinglayout for ' + this.immediateparent;
        </method>
        
        <method name="reset" args="ignore=null">
            this.photoscale = 1;
            this.photodimension = 70;
            this.skew = 0;
            this.skewindex = 1;
            this.spacing = 52;
            this.xspacing = this.spacing;
            this.yspacing = this.spacing
            this.yinset = 35;
         </method>

    </class>

</library>