# C1.Win.TouchToolKit.DataGridViewZoomPolicy ## Content

DataGridViewZoomPolicy Class

Represents a zoom policy for DataGridView type control.

Inheritance
object
ZoomPolicy
DataGridViewZoomPolicy
Namespace: C1.Win.TouchToolKit
Assembly: C1.Win.TouchToolKit.4.8.dll
Syntax
public class DataGridViewZoomPolicy : ZoomPolicy
Public Class DataGridViewZoomPolicy
    Inherits ZoomPolicy
Remarks

This zoom policy will try to zoom all fonts and row height, column width.

If a DataGridView has many rows or columns, change all cell's font，row's height or column's width many bring performance problem. Change this property value to false can solve the performance problem.

Examples

The following code example shows how to use DataGridViewZoomPolicy class.

You can copy the code to a exsit Windows Forms appliction. And set the form in the sample code as start form.

If you find a licenses error when run this code. Try to drag a C1Zoom component to a any Form from tool box can generate the licenses information to this project. 

public class DataGridViewZoomPolicyDemo : Form
{
	private DataGridView _dataGridView;
	private CheckBox _enableCheckBox;
	private CheckBox _fontCheckBox;
	private CheckBox _columnWidthCheckBox;
	private CheckBox _rowHeightCheckBox;
	private TextBox _targetTypeTextBox;
	private ListBox _defaultZoomPolicyListBox;
	private GcZoom _gcZoom1 = new GcZoom();
	private DataGridViewZoomPolicy _zoomPolicy = new DataGridViewZoomPolicy();

	public DataGridViewZoomPolicyDemo()
	{
		InitializeComponent();

		// DataGridView control should to change default font
		_dataGridView.ColumnHeadersDefaultCellStyle.Font = new Font(this.Font.FontFamily, this.Font.Size);
		_dataGridView.RowsDefaultCellStyle.Font = new Font(this.Font.FontFamily, this.Font.Size);

		_gcZoom1.Target = this;

		// Set DataGridView's ZoomPolicy object
		_gcZoom1.ZoomPolicies.Add(_zoomPolicy);

		GetTargetType();
		GetDefaultZoomPolicy();

		_enableCheckBox.CheckedChanged += _enableCheckBox_CheckedChanged;
		_fontCheckBox.CheckedChanged += _fontCheckBox_CheckedChanged;
		_columnWidthCheckBox.CheckedChanged += _columnWidthCheckBox_CheckedChanged;
		_rowHeightCheckBox.CheckedChanged += _rowHeightCheckBox_CheckedChanged;
	}

	void GetTargetType()
	{
		_targetTypeTextBox.Text = _zoomPolicy.TargetType.Name;
	}

	void GetDefaultZoomPolicy()
	{
		// Get GcZoom component build in zoompolicy of all
		foreach (ZoomPolicy item in _gcZoom1.DefaultZoomPolicies)
		{
			_defaultZoomPolicyListBox.Items.Add(item.ToString());
		}
	}

	void _enableCheckBox_CheckedChanged(object sender, EventArgs e)
	{
		_gcZoom1.ZoomFactor = 1f;
		_zoomPolicy.Enabled = _enableCheckBox.Checked;

		_fontCheckBox.Enabled = _enableCheckBox.Checked;
		_columnWidthCheckBox.Enabled = _enableCheckBox.Checked;
		_rowHeightCheckBox.Enabled = _enableCheckBox.Checked;
	}

	void _fontCheckBox_CheckedChanged(object sender, EventArgs e)
	{
		_gcZoom1.ZoomFactor = 1f;
		_zoomPolicy.ZoomCellStyleFont = _fontCheckBox.Checked;
	}

	void _columnWidthCheckBox_CheckedChanged(object sender, EventArgs e)
	{
		_gcZoom1.ZoomFactor = 1f;
		_zoomPolicy.ZoomColumnWidth = _columnWidthCheckBox.Checked;
	}

	void _rowHeightCheckBox_CheckedChanged(object sender, EventArgs e)
	{
		_gcZoom1.ZoomFactor = 1f;
		_zoomPolicy.ZoomRowHeight = _rowHeightCheckBox.Checked;
	}

	private void InitializeComponent()
	{
		_dataGridView = new DataGridView();
		_dataGridView.Location = new Point(20, 20);
		_dataGridView.Size = new Size(400, 500);

		DataGridViewColumn column1 = new DataGridViewColumn();
		column1.CellTemplate = new DataGridViewTextBoxCell();
		column1.HeaderText = "Column 1";
		_dataGridView.Columns.Add(column1);

		DataGridViewColumn column2 = new DataGridViewColumn();
		column2.CellTemplate = new DataGridViewTextBoxCell();
		column2.HeaderText = "Column 2";
		_dataGridView.Columns.Add(column2);

		DataGridViewColumn column3 = new DataGridViewColumn();
		column3.CellTemplate = new DataGridViewTextBoxCell();
		column3.HeaderText = "Column 3";
		_dataGridView.Columns.Add(column3);

		_enableCheckBox = new CheckBox();
		_enableCheckBox.Text = "Enabled";
		_enableCheckBox.Size = new Size(120, 20);
		_enableCheckBox.Location = new Point(450, 20);
		_enableCheckBox.Checked = true;

		_fontCheckBox = new CheckBox();
		_fontCheckBox.Text = "ZoomCellStyleFont";
		_fontCheckBox.Size = new Size(120, 20);
		_fontCheckBox.Location = new Point(450, 50);
		_fontCheckBox.Checked = true;

		_columnWidthCheckBox = new CheckBox();
		_columnWidthCheckBox.Text = "ZoomColumnWidth";
		_columnWidthCheckBox.Size = new Size(120, 20);
		_columnWidthCheckBox.Location = new Point(450, 80);
		_columnWidthCheckBox.Checked = true;

		_rowHeightCheckBox = new CheckBox();
		_rowHeightCheckBox.Text = "ZoomRowHeight";
		_rowHeightCheckBox.Size = new Size(120, 20);
		_rowHeightCheckBox.Location = new Point(450, 110);
		_rowHeightCheckBox.Checked = true;

		_targetTypeTextBox = new TextBox();
		_targetTypeTextBox.ReadOnly = true;
		_targetTypeTextBox.Size = new Size(120, 20);
		_targetTypeTextBox.Location = new Point(450, 140);

		_defaultZoomPolicyListBox = new ListBox();
		_defaultZoomPolicyListBox.Size = new Size(300, 200);
		_defaultZoomPolicyListBox.Location = new Point(450, 170);

		this.Controls.Add(_dataGridView);
		this.Controls.Add(_enableCheckBox);
		this.Controls.Add(_fontCheckBox);
		this.Controls.Add(_columnWidthCheckBox);
		this.Controls.Add(_rowHeightCheckBox);
		this.Controls.Add(_targetTypeTextBox);
		this.Controls.Add(_defaultZoomPolicyListBox);
		this.Size = new Size(800, 600);
	}
}
Public Class DataGridViewZoomPolicyDemo
	Inherits Form
	Private _dataGridView As DataGridView
	Private _enableCheckBox As CheckBox
	Private _fontCheckBox As CheckBox
	Private _columnWidthCheckBox As CheckBox
	Private _rowHeightCheckBox As CheckBox
	Private _targetTypeTextBox As TextBox
	Private _defaultZoomPolicyListBox As ListBox
	Private _gcZoom1 As New GcZoom()
	Private _zoomPolicy As New DataGridViewZoomPolicy()

	Public Sub New()
		InitializeComponent()

		' DataGridView control should to change default font
		_dataGridView.ColumnHeadersDefaultCellStyle.Font = New Font(Me.Font.FontFamily, Me.Font.Size)
		_dataGridView.RowsDefaultCellStyle.Font = New Font(Me.Font.FontFamily, Me.Font.Size)

		_gcZoom1.Target = Me

		' Set DataGridView's ZoomPolicy object
		_gcZoom1.ZoomPolicies.Add(_zoomPolicy)

		GetTargetType()
		GetDefaultZoomPolicy()

		AddHandler _enableCheckBox.CheckedChanged, AddressOf _enableCheckBox_CheckedChanged
		AddHandler _fontCheckBox.CheckedChanged, AddressOf _fontCheckBox_CheckedChanged
		AddHandler _columnWidthCheckBox.CheckedChanged, AddressOf _columnWidthCheckBox_CheckedChanged
		AddHandler _rowHeightCheckBox.CheckedChanged, AddressOf _rowHeightCheckBox_CheckedChanged
	End Sub

	Private Sub GetTargetType()
		_targetTypeTextBox.Text = _zoomPolicy.TargetType.Name
	End Sub

	Private Sub GetDefaultZoomPolicy()
		' Get GcZoom component build in zoompolicy of all
		For Each item As ZoomPolicy In _gcZoom1.DefaultZoomPolicies
			_defaultZoomPolicyListBox.Items.Add(item.ToString())
		Next
	End Sub

	Private Sub _enableCheckBox_CheckedChanged(sender As Object, e As EventArgs)
		_gcZoom1.ZoomFactor = 1.0F
		_zoomPolicy.Enabled = _enableCheckBox.Checked

		_fontCheckBox.Enabled = _enableCheckBox.Checked
		_columnWidthCheckBox.Enabled = _enableCheckBox.Checked
		_rowHeightCheckBox.Enabled = _enableCheckBox.Checked
	End Sub

	Private Sub _fontCheckBox_CheckedChanged(sender As Object, e As EventArgs)
		_gcZoom1.ZoomFactor = 1.0F
		_zoomPolicy.ZoomCellStyleFont = _fontCheckBox.Checked
	End Sub

	Private Sub _columnWidthCheckBox_CheckedChanged(sender As Object, e As EventArgs)
		_gcZoom1.ZoomFactor = 1.0F
		_zoomPolicy.ZoomColumnWidth = _columnWidthCheckBox.Checked
	End Sub

	Private Sub _rowHeightCheckBox_CheckedChanged(sender As Object, e As EventArgs)
		_gcZoom1.ZoomFactor = 1.0F
		_zoomPolicy.ZoomRowHeight = _rowHeightCheckBox.Checked
	End Sub

	Private Sub InitializeComponent()
		_dataGridView = New DataGridView()
		_dataGridView.Location = New Point(20, 20)
		_dataGridView.Size = New Size(400, 500)

		Dim column1 As New DataGridViewColumn()
		column1.CellTemplate = New DataGridViewTextBoxCell()
		column1.HeaderText = "Column 1"
		_dataGridView.Columns.Add(column1)

		Dim column2 As New DataGridViewColumn()
		column2.CellTemplate = New DataGridViewTextBoxCell()
		column2.HeaderText = "Column 2"
		_dataGridView.Columns.Add(column2)

		Dim column3 As New DataGridViewColumn()
		column3.CellTemplate = New DataGridViewTextBoxCell()
		column3.HeaderText = "Column 3"
		_dataGridView.Columns.Add(column3)

		_enableCheckBox = New CheckBox()
		_enableCheckBox.Text = "Enabled"
		_enableCheckBox.Size = New Size(120, 20)
		_enableCheckBox.Location = New Point(450, 20)
		_enableCheckBox.Checked = True

		_fontCheckBox = New CheckBox()
		_fontCheckBox.Text = "ZoomCellStyleFont"
		_fontCheckBox.Size = New Size(120, 20)
		_fontCheckBox.Location = New Point(450, 50)
		_fontCheckBox.Checked = True

		_columnWidthCheckBox = New CheckBox()
		_columnWidthCheckBox.Text = "ZoomColumnWidth"
		_columnWidthCheckBox.Size = New Size(120, 20)
		_columnWidthCheckBox.Location = New Point(450, 80)
		_columnWidthCheckBox.Checked = True

		_rowHeightCheckBox = New CheckBox()
		_rowHeightCheckBox.Text = "ZoomRowHeight"
		_rowHeightCheckBox.Size = New Size(120, 20)
		_rowHeightCheckBox.Location = New Point(450, 110)
		_rowHeightCheckBox.Checked = True

		_targetTypeTextBox = New TextBox()
		_targetTypeTextBox.[ReadOnly] = True
		_targetTypeTextBox.Size = New Size(120, 20)
		_targetTypeTextBox.Location = New Point(450, 140)

		_defaultZoomPolicyListBox = New ListBox()
		_defaultZoomPolicyListBox.Size = New Size(300, 200)
		_defaultZoomPolicyListBox.Location = New Point(450, 170)

		Me.Controls.Add(_dataGridView)
		Me.Controls.Add(_enableCheckBox)
		Me.Controls.Add(_fontCheckBox)
		Me.Controls.Add(_columnWidthCheckBox)
		Me.Controls.Add(_rowHeightCheckBox)
		Me.Controls.Add(_targetTypeTextBox)
		Me.Controls.Add(_defaultZoomPolicyListBox)
		Me.Size = New Size(800, 600)
	End Sub
End Class

Constructors

Name Description
DataGridViewZoomPolicy()

Properties

Name Description
TargetType

Gets the type indicates which control type can use this policy.
ZoomCellStyleFont

Gets or sets a value indicating whether zoom cell style's font.
ZoomColumnWidth

Gets or sets a value indicating whether resize column's width.
ZoomRowHeight

Gets or sets a value indicating whether resize row's height.

Methods

Name Description
ZoomBounds(Control, ZoomBoundsInfo)

Zoom the control bounds.
ZoomFont(Control, ZoomFontInfo)

Zoom the control font.

See Also

ZoomPolicy