SpreadJS 13
GC.Spread.Sheets.CellTypes Namespace / Base class / paint Method
The canvas's two-dimensional context.
The cell's value.
x-coordinate relative to the canvas.
y-coordinate relative to the canvas.
The cell's width.
The cell's height.
The cell's actual style.
The context associated with the cell type. See the Remarks for more information.
In This Topic
    paint Method
    In This Topic
    Paints a cell on the canvas.
    Syntax
    var instance = new GC.Spread.Sheets.CellTypes.Base();
    var returnValue; // Type: any
    returnValue = instance.paint(ctx, value, x, y, w, h, style, context);
    function paint( 
       ctx : CanvasRenderingContext2D,
       value : Object,
       x : number,
       y : number,
       w : number,
       h : number,
       style : Style,
       context : Object
    ) : any;

    Parameters

    ctx
    The canvas's two-dimensional context.
    value
    The cell's value.
    x
    x-coordinate relative to the canvas.
    y
    y-coordinate relative to the canvas.
    w
    The cell's width.
    h
    The cell's height.
    style
    The cell's actual style.
    context
    The context associated with the cell type. See the Remarks for more information.
    Example
    This example creates custom cells.
    //Custom Cell Type
              function FivePointedStarCellType() {
                  this.fillStyle = "orange";
                  this.size = 10;
              }
              FivePointedStarCellType.prototype = new GC.Spread.Sheets.CellTypes.Base();
              FivePointedStarCellType.prototype.paint = function (ctx, value, x, y, w, h, style, context) {
                  if (!ctx) {
                      return;
                  }
    
                ctx.save();
    
                // draw inside the cell's boundary
                  ctx.rect(x, y, w, h);
                  ctx.clip();
                  ctx.beginPath();
    
                if (value) {
                      ctx.fillStyle = this.fillStyle;
                  } else {
                      ctx.fillStyle = "gray";
                  }
    
                var size = this.size;
                  var dx = x + w / 2;
                  var dy = y + h / 2;
                  ctx.beginPath();
                  var dig = Math.PI / 5 * 4;
                  for (var i = 0; i < 5; i++) {
                      ctx.lineTo(dx + Math.sin(i * dig) * size, dy + Math.cos(i * dig) * size);
                  }
                  ctx.closePath();
                  ctx.fill();
    
                ctx.restore();
              };
              FivePointedStarCellType.prototype.getHitInfo = function (x, y, cellStyle, cellRect, context) {
                  var xm = cellRect.x + cellRect.width / 2,
                          ym = cellRect.y + cellRect.height / 2,
                          size = 10;
                  var info = { x: x, y: y, row: context.row, col: context.col, cellRect: cellRect, sheetArea: context.sheetArea };
                  if (xm - size <= x && x <= xm + size && ym - size <= y && y <= ym + size) {
                      info.isReservedLocation = true;
                  }
                  return info;
              };
              FivePointedStarCellType.prototype.processMouseUp = function (hitInfo) {
                  var sheet = hitInfo.sheet;
                  if (sheet && hitInfo.isReservedLocation) {
                      var row = hitInfo.row, col = hitInfo.col, sheetArea = hitInfo.sheetArea;
                      var newValue = !sheet.getValue(row, col, sheetArea);
                      var cellEditInfo = { row: row, col: col, newValue: newValue };
             spread.commandManager().execute({cmd: "editCell", sheetName: activeSheet.name(), row: row, col: col, newValue: newValue});
                      return true;
                  }
                  return false;
              };
    
            function FullNameCellType() {
              }
              FullNameCellType.prototype = new GC.Spread.Sheets.CellTypes.Base();
              FullNameCellType.prototype.paint = function (ctx, value, x, y, w, h, style, context) {
                  if (value) {
                      GC.Spread.Sheets.CellTypes.Base.prototype.paint.apply(this, [ctx, value.firstName + "." + value.lastName, x, y, w, h, style, context]);
                  }
              };
              FullNameCellType.prototype.updateEditor = function (editorContext, cellStyle, cellRect, context) {
                  if (editorContext) {
                      $(editorContext).width(cellRect.width);
                      $(editorContext).height(100);
                  }
              };
              FullNameCellType.prototype.createEditorElement = function (context) {
                  var div = document.createElement("div");
                  var $div = $(div);
                  $div.attr("gcUIElement", "gcEditingInput");
                  $div.css("background-color", "white");
                  $div.css("position", "absolute");
                  $div.css("overflow", "hidden");
                  $div.css("border", "2px #5292f7 solid");
                  var $span1 = $("<span></span>");
                  $span1.css("display", "block");
                  var $span2 = $("<span></span>");
                  $span2.css("display", "block");
                  var $input1 = $("<input type='text'/>");
                  var $input2 = $("<input type='text'/>");
                  $div.append($span1);
                  $div.append($input1);
                  $div.append($span2);
                  $div.append($input2);
                  return div;
              };
              FullNameCellType.prototype.getEditorValue = function (editorContext) {
                  if (editorContext && editorContext.children.length === 4) {
                      var input1 = editorContext.children[1];
                      var firstName = $(input1).val();
                      var input2 = editorContext.children[3];
                      var lastName = $(input2).val();
                      return { firstName: firstName, lastName: lastName };
                  }
              };
              FullNameCellType.prototype.setEditorValue = function (editorContext, value) {
                  if (editorContext && editorContext.children.length === 4) {
                      var span1 = editorContext.children[0];
                      $(span1).text("First Name:");
                      var span2 = editorContext.children[2];
                      $(span2).text("Last Name:");
                      if (value) {
                          var input1 = editorContext.children[1];
                          $(input1).val(value.firstName);
                          var input2 = editorContext.children[3];
                          $(input2).val(value.lastName);
                      }
                  }
              };
              FullNameCellType.prototype.isReservedKey = function (e, context) {
                  //cell type handle tab key by itself
                  return (e.keyCode === GC.Spread.Commands.Key.tab && !e.ctrlKey && !e.shiftKey && !e.altKey);
              };
              FullNameCellType.prototype.isEditingValueChanged = function (oldValue, newValue,context) {
                  if (newValue.firstName != oldValue.firstName || newValue.lastName != oldValue.lastName) {
                      return true;
                  }
                  return false;
              };
              $(function () {
    
    var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
                  var sheet = spread.getActiveSheet();
                  sheet.suspendPaint();
                  sheet.setCellType(0, 0, new FivePointedStarCellType());
                  sheet.setValue(0, 0, true);
                  sheet.setRowHeight(0, 200);
                  sheet.setColumnWidth(0, 200);
                  sheet.setCellType(0, 1, new FullNameCellType());
                  sheet.setColumnWidth(1, 200);
                  sheet.setValue(0, 1, { firstName: "Bob", lastName: "Smith" });
                  sheet.resumePaint();
              });
    Remarks

    The context parameter can include the following items:

    Item Type Description
    context.sheet GC.Spread.Sheets.Sheet instance Indicates the current sheet.
    context.row number The row index.
    context.col number The column index.
    context.sheetArea GC.Spread.Sheets.SheetArea The current sheet area.
    See Also

    Reference

    Base class