## Table Panels

The "Table" Panel, Panel.Table, arranges objects in rows and columns.

### Simple Table Panels

Each object in a Table Panel is put into the cell indexed by the value of GraphObject.row and GraphObject.column. The panel will look at the rows and columns for all of the objects in the panel to determine how many rows and columns the table should have.

      diagram.add(
        // all Parts are Panels
        $(go.Part, go.Panel.Table,  // or "Table"
            $(go.TextBlock, "row 0\ncol 0",
              { row: 0, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 0\ncol 1",
              { row: 0, column: 1, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 0",
              { row: 1, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 2",
              { row: 1, column: 2, margin: 2, background: "lightgray" })
        ));

Note that not every "cell" of the table needs to have a GraphObject in it.

If there are multiple objects in a cell, they will probably overlap each other in the cell. By default objects are center-aligned in each cell.

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            $(go.TextBlock, "row 0\ncol 0",
              { row: 0, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 0 col 1\nyellow background",
              // first object in the cell (row: 0, col: 1)
              { row: 0, column: 1, margin: 2,
                background: "yellow", stroke: "gray" }),
            $(go.TextBlock, "row 0\ncol 1",
              // second object in that cell overlaps the first one,
              // the bigger yellow TextBlock
              { row: 0, column: 1, margin: 2,
                background: "transparent", stroke: "blue" }),
            $(go.TextBlock, "row 1\ncol 0",
              { row: 1, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 2",
              { row: 1, column: 2, margin: 2, background: "lightgray" })
          )
        ));

If a column or a row has no objects in it, that column or row is ignored.

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            $(go.TextBlock, "row 0\ncol 0",
              { row: 0, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 0\ncol 11",  // column 11 -- nothing in columns 1-10
              { row: 0, column: 11, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 0",
              { row: 1, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 12",  // column 12
              { row: 1, column: 12, margin: 2, background: "lightgray" })
          )
        ));

### Sizing of Rows or Columns

The height of each row is normally determined by the greatest height of all of the objects in that row. Similarly, the width of each column is normally determined by the greatest width of all of the objects in that column. However you can provide row height or column width information for any row or column independent of any individual object by setting properties of the desired RowColumnDefinition of the Table panel.

To fix a column width or a row height in code you can call Panel.getColumnDefinition or Panel.getRowDefinition and then set RowColumnDefinition.width or RowColumnDefinition.height. If you want to limit the width or height to certain ranges, set the RowColumnDefinition.minimum or RowColumnDefinition.maximum. If the maximum and the width or height conflict, the maximum takes precedence. For example, if the maximum is 70 but the natural value is 80, the actual value is limited to 70. If that value conflicts with the minimum, the minimum takes precedence. For example, if the minimum is 50 but the natural value is 40, the actual value is 50.

This example demonstrates how the column width may be controlled.

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            { defaultAlignment: go.Spot.Left },
            $(go.RowColumnDefinition, { column: 0, width: 100 }),
            $(go.RowColumnDefinition, { column: 1, width: 100, minimum: 150 }),
            $(go.RowColumnDefinition, { column: 2, width: 100, maximum: 50 }),
            $(go.RowColumnDefinition, { column: 3, width: 100, minimum: 150, maximum: 50 }),
            $(go.TextBlock, "Text Block",
              { row: 0, column: 0, background: "green" }),
            $(go.TextBlock, "Text Block",
              { row: 0, column: 1, background: "red" }),
            $(go.TextBlock, "Text Block",
              { row: 0, column: 2, background: "yellow" }),
            $(go.TextBlock, "Text Block",
              { row: 0, column: 3, background: "red" }),
            $(go.Panel, "Auto",
              { row: 1, column: 0 },
              $(go.Shape, "RoundedRectangle", { fill: "green" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.Panel, "Auto",
              { row: 1, column: 1 },
              $(go.Shape, "RoundedRectangle", { fill: "red" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.Panel, "Auto",
              { row: 1, column: 2 },
              $(go.Shape, "RoundedRectangle", { fill: "yellow" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.Panel, "Auto",
              { row: 1, column: 3 },
              $(go.Shape, "RoundedRectangle", { fill: "red" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "width: 100", { row: 2, column: 0 }),
            $(go.TextBlock, "min: 150", { row: 2, column: 1 }),
            $(go.TextBlock, "max: 50", { row: 2, column: 2 }),
            $(go.TextBlock, "min & max", { row: 2, column: 3 })
          )
        ));

Note how the column with a minimum of 150 has a lot of extra space in it, and how the column with a maximum of 50 results in its elements being clipped.

### Stretch and Alignment

The size of a GraphObject in a Panel is determined by many factors. The GraphObject.stretch property specifies whether the width and/or height should take up all of the space given to it by the Panel. When the width and/or height is not stretched to fill the given space, the GraphObject.alignment property controls where the object is placed if it is smaller than available space. One may also stretch the width while aligning vertically, just as one may also stretch vertically while aligning along the X axis.

The alignment value for a GraphObject, if not given by the value of GraphObject.alignment, may be inherited. If the object is in a Table Panel, the value may inherit from the RowColumnDefinition.alignments of the row and of the column that the object is in. Finally the value may be inherited from the Panel.defaultAlignment property.

The same inheritance is true for the stretch value for a GraphObject: GraphObject.stretch, RowColumnDefinition.stretch, and finally Panel.defaultStretch.

#### Alignment in Columns

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            { defaultAlignment: go.Spot.Left },
            $(go.RowColumnDefinition, { column: 0, width: 200 }),
            $(go.RowColumnDefinition, { column: 1, width: 15 }),
            $(go.Panel, "Auto",
              { row: 0, column: 0, alignment: go.Spot.Left },
              $(go.Shape, "RoundedRectangle", { fill: "lightblue" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "alignment: Left", { row: 0, column: 2 }),
            $(go.Panel, "Auto",
              { row: 1, column: 0, alignment: go.Spot.Center},
              $(go.Shape, "RoundedRectangle", { fill: "lightblue" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "alignment: Center", { row: 1, column: 2 }),
            $(go.Panel, "Auto",
              { row: 2, column: 0, alignment: go.Spot.Right },
              $(go.Shape, "RoundedRectangle", { fill: "lightblue" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "alignment: Right", { row: 2, column: 2 }),
            $(go.Panel, "Auto",
              { row: 3, column: 0, stretch: go.GraphObject.Horizontal },
              $(go.Shape, "RoundedRectangle", { fill: "yellow" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "stretch: Horizontal", { row: 3, column: 2 })
          )
        ));

#### Alignment in Rows

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            { defaultAlignment: go.Spot.Top },
            $(go.RowColumnDefinition, { row: 0, height: 50 }),
            $(go.RowColumnDefinition, { row: 1, height: 15 }),
            $(go.Panel, "Auto",
              { row: 0, column: 0, alignment: go.Spot.Top },
              $(go.Shape, "RoundedRectangle", { fill: "lightblue" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "alignment:\nTop", { row: 2, column: 0 }),
            $(go.Panel, "Auto",
              { row: 0, column: 1, alignment: go.Spot.Center},
              $(go.Shape, "RoundedRectangle", { fill: "lightblue" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "alignment:\nCenter", { row: 2, column: 1 }),
            $(go.Panel, "Auto",
              { row: 0, column: 2, alignment: go.Spot.Bottom },
              $(go.Shape, "RoundedRectangle", { fill: "lightblue" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "alignment:\nBottom", { row: 2, column: 2 }),
            $(go.Panel, "Auto",
              { row: 0, column: 3, stretch: go.GraphObject.Vertical },
              $(go.Shape, "RoundedRectangle", { fill: "yellow" }),
              $(go.TextBlock, "Auto Panel")
            ),
            $(go.TextBlock, "stretch:\nVertical", { row: 2, column: 3 })
          )
        ));

### Spanning Rows or Columns

An element in a Table Panel cell can cover more than one cell if you set the GraphObject.rowSpan or GraphObject.columnSpan properties. For example, if the value of GraphObject.columnSpan is greater than one, it specifies how many columns that object may cover, starting with the value of GraphObject.column, but excluding the column indexed by column + columnSpan.

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            $(go.TextBlock, "Three Col Header",  // spans all three columns
              { row: 0, column: 0, columnSpan: 3, stretch: go.GraphObject.Horizontal,
                margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 0",
              { row: 1, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 1",
              { row: 1, column: 1, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 2\ncol 0",
              { row: 2, column: 0, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 2\ncol 2",
              { row: 2, column: 2, margin: 2, background: "lightgray" })
          )
        ));

Here is an example that includes both column spanning and row spanning.

      diagram.add(
        $(go.Part,
          $(go.Panel, "Table",
            $(go.TextBlock, "Greetings",
              { row: 0, column: 0, columnSpan: 3, stretch: go.GraphObject.Horizontal,
                margin: 2, background: "lightgray" }),
            $(go.TextBlock, "numbers",
              { row: 1, column: 0, rowSpan: 2, stretch: go.GraphObject.Vertical,
                margin: 2, background: "lightgray", angle: 270 }),
            $(go.TextBlock, "row 1\ncol 1",
              { row: 1, column: 1, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 1\ncol 2",
              { row: 1, column: 2, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 2\ncol 1",
              { row: 2, column: 1, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "row 2\ncol 3",
              { row: 2, column: 3, margin: 2, background: "lightgray" }),
            $(go.TextBlock, "Signature",
              { row: 3, column: 2, columnSpan: 2, stretch: go.GraphObject.Horizontal,
                margin: 2, background: "lightgray" })
          )
        ));

### Separators and Row/Column Padding

Table Panels also support the optional drawing of lines between rows or columns. The RowColumnDefinition.separatorStrokeWidth property controls the extra space that comes before a particular row or column. The RowColumnDefinition.separatorStroke and RowColumnDefinition.separatorDashArray control if and how a line is drawn.

For example, if you want to treat the first row and the first column as "headers", you can separate them from the rest of the table by drawing a black line before row 1 and column 1.

      diagram.add(
        $(go.Part, "Auto",
          $(go.Shape, { fill: "white", stroke: "gray", strokeWidth: 3 }),
          $(go.Panel, "Table",
            $(go.TextBlock, "Header 1",
              { row: 0, column: 1, font: "bold 10pt sans-serif", margin: 2 }),
            $(go.TextBlock, "Header 2",
              { row: 0, column: 2, font: "bold 10pt sans-serif", margin: 2 }),

            // drawn before row 1:
            $(go.RowColumnDefinition,
              { row: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),
            // drawn before column 1:
            $(go.RowColumnDefinition,
              { column: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),

            $(go.TextBlock, "One", { row: 1, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 1 col 1", { row: 1, column: 1, margin: 2 }),
            $(go.TextBlock, "row 1 col 2", { row: 1, column: 2, margin: 2 }),
            $(go.TextBlock, "Two", { row: 2, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 2 col 1", { row: 2, column: 1, margin: 2 }),
            $(go.TextBlock, "row 2 col 2", { row: 2, column: 2, margin: 2 }),
            $(go.TextBlock, "Three", { row: 3, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 3 col 1", { row: 3, column: 1, margin: 2 }),
            $(go.TextBlock, "row 3 col 2", { row: 3, column: 2, margin: 2 })
          )
        ));

If you want to have a default separator between each row, set the default separator properties of the Panel. These properties are:

- Panel.defaultSeparatorPadding
- Panel.defaultRowSeparatorStrokeWidth
- Panel.defaultRowSeparatorStroke
- Panel.defaultRowSeparatorDashArray
- Panel.defaultColumnSeparatorStrokeWidth
- Panel.defaultColumnSeparatorStroke
- Panel.defaultColumnSeparatorDashArray

Any separator properties set on a particular RowColumnDefinition will take precedence over the default values provided on the Panel. This permits keeping the special black line separating the header row and header column from the rest.

      diagram.add(
        $(go.Part, "Auto",
          $(go.Shape, { fill: "white", stroke: "gray", strokeWidth: 3 }),
          $(go.Panel, "Table",
            // Set defaults for all rows and columns:
            { defaultRowSeparatorStroke: "gray",
              defaultColumnSeparatorStroke: "gray" },

            $(go.TextBlock, "Header 1",
              { row: 0, column: 1, font: "bold 10pt sans-serif", margin: 2 }),
            $(go.TextBlock, "Header 2",
              { row: 0, column: 2, font: "bold 10pt sans-serif", margin: 2 }),

            $(go.RowColumnDefinition,
              { row: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),
            $(go.RowColumnDefinition,
              { column: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),

            $(go.TextBlock, "One", { row: 1, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 1 col 1", { row: 1, column: 1, margin: 2 }),
            $(go.TextBlock, "row 1 col 2", { row: 1, column: 2, margin: 2 }),
            $(go.TextBlock, "Two", { row: 2, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 2 col 1", { row: 2, column: 1, margin: 2 }),
            $(go.TextBlock, "row 2 col 2", { row: 2, column: 2, margin: 2 }),
            $(go.TextBlock, "Three", { row: 3, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 3 col 1", { row: 3, column: 1, margin: 2 }),
            $(go.TextBlock, "row 3 col 2", { row: 3, column: 2, margin: 2 })
          )
        ));

RowColumnDefinitions also have a RowColumnDefinition.separatorPadding property, which can be used to add extra space to rows or columns. When a RowColumnDefinition.background is set, it includes the padding in its area.

      diagram.add(
        $(go.Part, "Auto",
          $(go.Shape, { fill: "white", stroke: "gray", strokeWidth: 3 }),
          $(go.Panel, "Table",
            // Set defaults for all rows and columns:
            { padding: 1.5,
              defaultRowSeparatorStroke: "gray",
              defaultColumnSeparatorStroke: "gray",
              defaultSeparatorPadding: new go.Margin(18, 0, 8, 0) },

            $(go.TextBlock, "Header 1",
              { row: 0, column: 1, font: "bold 10pt sans-serif", margin: 2 }),
            $(go.TextBlock, "Header 2",
              { row: 0, column: 2, font: "bold 10pt sans-serif", margin: 2 }),

            // Override the panel's default padding on the first row
            $(go.RowColumnDefinition, { row: 0, separatorPadding: 0 }),

            $(go.RowColumnDefinition,
              { row: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),
            $(go.RowColumnDefinition, { row: 2, background: 'lightblue' }),

            $(go.RowColumnDefinition,
              { column: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),
            $(go.TextBlock, "One", { row: 1, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 1 col 1", { row: 1, column: 1, margin: 2 }),
            $(go.TextBlock, "row 1 col 2", { row: 1, column: 2, margin: 2 }),
            $(go.TextBlock, "Two", { row: 2, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 2 col 1", { row: 2, column: 1, margin: 2 }),
            $(go.TextBlock, "row 2 col 2", { row: 2, column: 2, margin: 2 }),
            $(go.TextBlock, "Three", { row: 3, column: 0, stroke: "green", margin: 2 }),
            $(go.TextBlock, "row 3 col 1", { row: 3, column: 1, margin: 2 }),
            $(go.TextBlock, "row 3 col 2", { row: 3, column: 2, margin: 2 })
          )
        ));

### TableRows and TableColumns

To avoid having to specify the row for each object, you can make use of a special Panel that can only be used in Table Panels, the Panel.TableRow panel type. Put all of the objects for each row into a TableRow Panel. You will still need to specify the column for each object in each row.

      diagram.add(
        $(go.Part, "Auto",
          $(go.Shape, { fill: "white", stroke: "gray", strokeWidth: 3 }),
          $(go.Panel, "Table",
            // Set defaults for all rows and columns:
            { defaultRowSeparatorStroke: "gray",
              defaultColumnSeparatorStroke: "gray" },
            $(go.Panel, "TableRow", { row: 0 },
              $(go.TextBlock, "Header 1",
                { column: 1, font: "bold 10pt sans-serif", margin: 2 }),
              $(go.TextBlock, "Header 2",
                { column: 2, font: "bold 10pt sans-serif", margin: 2 })),
            $(go.RowColumnDefinition,
              { row: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),
            $(go.RowColumnDefinition,
              { column: 1, separatorStrokeWidth: 1.5, separatorStroke: "black" }),
            $(go.Panel, "TableRow", { row: 1 },
              $(go.TextBlock, "One", { column: 0, stroke: "green", margin: 2 }),
              $(go.TextBlock, "row 1 col 1", { column: 1, margin: 2 }),
              $(go.TextBlock, "row 1 col 2", { column: 2, margin: 2 })
            ),
            $(go.Panel, "TableRow", { row: 2 },
              $(go.TextBlock, "Two", { column: 0, stroke: "green", margin: 2 }),
              $(go.TextBlock, "row 2 col 1", { column: 1, margin: 2 }),
              $(go.TextBlock, "row 2 col 2", { column: 2, margin: 2 })
            ),
            $(go.Panel, "TableRow", { row: 3 },
              $(go.TextBlock, "Three", { column: 0, stroke: "green", margin: 2 }),
              $(go.TextBlock, "row 3 col 1", { column: 1, margin: 2 }),
              $(go.TextBlock, "row 3 col 2", { column: 2, margin: 2 })
            )
          )
        ));

The same kind of organization is also possible with columns by using Panel.TableColumn Panels.