Positioning in Xamarin Forms with Repeater, Relative view and scroll -


i have problem setup proper layout xamarin forms

i need have layout in buttons generated repeater. area must scrollable 3 buttons visible @ moment height of repeater/3, , filling whole area, rest scrolled. buttons need have same height (repeater/3). dont know number of buttons

i have 

        <scrollview  horizontaloptions="fillandexpand" verticaloptions="fillandexpand" grid.row="3" grid.rowspan="2" grid.column="1" backgroundcolor="red">         <relativelayout x:name="xname">             <controls:repeaterview itemssource="{binding buttons}" x:name="test"               relativelayout.widthconstraint="{constraintexpression type=relativetoparent,property=width,factor=1,constant=0}"             relativelayout.heightconstraint="{constraintexpression type=relativetoparent,property=height,factor=1,constant=0}">                 <controls:repeaterview.itemtemplate>                     <datatemplate>                         <viewcell>                             <relativelayout                                  horizontaloptions="fillandexpand"                                 relativelayout.heightconstraint="{constraintexpression type=relativetoview,elementname=test property=height,factor=1,constant=0}">                                 <button text="{binding name}"  relativelayout.widthconstraint="{constraintexpression type=relativetoparent,property=width,factor=1,constant=0}"/>                             </relativelayout>                         </viewcell>                     </datatemplate>                 </controls:repeaterview.itemtemplate>             </controls:repeaterview>         </relativelayout>     </scrollview>

my code produces sth this:

enter image description here

i need this:

enter image description here

the content of image not important. need have buttons scaled 3 buttons will red area, rest (of same size) scorlled

don't let scrollview "fillandexpand" vertically. instead, give heightrequest of 3 buttons + padding or put scrollview in little container 3 buttons tall.

can put in grid this:

<grid>    <grid.rowdefinitions>       <rowdefinition height="3*" />       <rowdefinition height="7*" />    </grid.rowdefinitions>    <scrollview  horizontaloptions="fillandexpand" verticaloptions="fillandexpand" grid.row="0" backgroundcolor="red">         <controls:repeaterview itemssource="{binding buttons}" x:name="test">             <controls:repeaterview.itemtemplate>                 <datatemplate>                     <viewcell>                         <relativelayout                              horizontaloptions="fillandexpand"                             relativelayout.heightconstraint="{constraintexpression type=relativetoview,elementname=test property=height,factor=1,constant=0}">                             <button text="{binding name}"  relativelayout.widthconstraint="{constraintexpression type=relativetoparent,property=width,factor=1,constant=0}"/>                         </relativelayout>                     </viewcell>                 </datatemplate>             </controls:repeaterview.itemtemplate>         </controls:repeaterview>    </scrollview> </grid>

so first row fill 3/10 (0.3 or 30%) of screen , second row fill 7/10 of screen.


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