firemonkey Grid自定义

http://stackoverflow.com/questions/28893564/memory-leak-on-tstringgrids-ondrawcolumncell-event

http://stackoverflow.com/questions/26824307/how-to-display-a-multiline-text-in-a-stringgrid-cell-delphi-xe6-android

http://stackoverflow.com/questions/25410901/firemonkey-xe5-livebinding-tgrid-cell-text-aligment

http://cc.embarcadero.com/Item/28894

ColumnHeader

procedure TFrm.GridLDrawColumnHeader(Sender: TObject;
  const Canvas: TCanvas; const Column: TColumn; const Bounds: TRectF);
begin
  Canvas.Fill.Color := TAlphaColorRec.Lightskyblue;
  Canvas.FillRect(Bounds, 0, 0, [], 1);
  Canvas.Fill.Color := TAlphaColorRec.White;
  // Canvas.te//设置字体
  Canvas.FillText(Bounds, Column.Header, False, 1, [], TTextAlign.Center, TTextAlign.Center);
end;

 DrawColumnCell

 取Grid任意行任意列的值或者是可见区域的单元格值，未验证。

    Grid1.Model.GetValue(col,row);

LeftColumn
RigthColumn

TopRow
BottomRow

Specifies the index of the first visible scrollable row in the grid.

Read TopRow to determine the index of the first row in the scrollable region that is visible. Set TopRow to scroll the rows in the grid so that the row with the TopRow index is the first row after the fixed rows.

  head:THeader;
  LContent:TControl;

head:=Grid1.FindStyleResource('header') as THeader;

Grid1.FindStyleResource<THeader>(StrHeader, FHeader)

Grid1.FindStyleResource<TControl>('header', LContent)

获取grid操作系统默认选择行颜色值。focus是选择单元格的值，selection是选中行的值。

self.Rectangle1.Fill.Color:= ((self.Grid1.FindStyleResource('focus') as TControl) as TRectangle) .Fill.Color;
self.Rectangle1.Fill.Color:= ((self.Grid1.FindStyleResource('selection') as TControl) as TRectangle) .Fill.Color;

一次转换就可以。 

self.Rectangle1.Fill.Color := (self.Grid1.FindStyleResource('focus') as TRectangle).Fill.Color;
 self.Rectangle1.Fill.Color := (self.Grid1.FindStyleResource('selection') as TRectangle).Fill.Color;

FMX.Grid.Style文件里定义了这2种初始化的地方，如下：

FindStyleResource<TControl>(StrFocus, FFocus)

FindStyleResource<TControl>(StrSelection, FSelection)

 

画当前行和当前单元格，TOpenControl(FSelectionClone).PaintInternal;TControl.PaintInternal;  最终调用了FMX.Objects里的TShape.Painting