Men alligevel... her er en rettet udgave som også retter text bounds så det svarer til en alm. CheckBox. Jeg håber ikke at jeg har overset stavefejl denne gang ;-)
namespace CheckBoxX
{
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
class CheckBoxX : CheckBox
{
private CheckBoxState checkBoxState = CheckBoxState.UncheckedNormal;
private VisualStyleRenderer visualStyleRenderer = null;
private Rectangle checkMarkBounds = Rectangle.Empty;
private Rectangle textBounds = Rectangle.Empty;
private Color glyphTextColor = Color.Empty;
/// <summary>
/// Default Constructor.
/// </summary>
public CheckBoxX() : base()
{
this.GetPartDetails();
}
/// <summary>
/// Override in order to draw checkmark as "X"
/// </summary>
/// <param name="paintEventArgs">PaintEventArgs.</param>
protected override void OnPaint(PaintEventArgs paintEventArgs)
{
// Note! Remember to enabme VisualStyles (Application.EnableVisualStyles();)
// This demo will only work then VisualStyles is enabled and Appearance is normal.
if (Application.RenderWithVisualStyles && this.Appearance == Appearance.Normal) // Dont do anything in case that the CheckBox is drawn as a button.
{
CheckBoxRenderer.DrawParentBackground(paintEventArgs.Graphics, paintEventArgs.ClipRectangle, this);
CheckBoxState state = RemoveCheckedState(this.checkBoxState);
// In case that you want to draw all using the Renderer insert these lines.
CheckBoxRenderer.DrawCheckBox(paintEventArgs.Graphics,
this.ClientRectangle.Location,
this.textBounds,
this.Text,
this.Font,
TextFormatFlags.Left,
this.ShowFocusCues & this.Focused,
state);
if (this.Checked)
{
this.DrawCheckMark(paintEventArgs.Graphics);
}
}
else
{
base.OnPaint(paintEventArgs);
}
}
/// <summary>
/// </summary>
/// <param name="paintEventArgs"></param>
private void DrawCheckMark(Graphics graphics)
{
if (graphics == null)
{
throw new ArgumentNullException("graphics");
}
float penSize = 2.0f;
Rectangle bounds = this.checkMarkBounds;
using (Pen pen = new Pen(this.glyphTextColor, penSize))
{
graphics.DrawLine(pen, bounds.Location, new Point(bounds.Right - 1, bounds.Bottom));
graphics.DrawLine(pen, new Point(bounds.Left, bounds.Bottom), new Point(bounds.Right - 1, bounds.Top));
}
}
/// <summary>
/// Replaces a possible Checked state into a unchecked state.
/// </summary>
/// <param name="checkBoxState">Current CheckBoxState.</param>
/// <returns>Modified CheckBoxState.</returns>
private static CheckBoxState RemoveCheckedState(CheckBoxState checkBoxState)
{
switch (checkBoxState)
{
case CheckBoxState.CheckedDisabled:
checkBoxState = CheckBoxState.UncheckedDisabled;
break;
case CheckBoxState.CheckedHot:
checkBoxState = CheckBoxState.UncheckedHot;
break;
case CheckBoxState.CheckedNormal:
checkBoxState = CheckBoxState.UncheckedNormal;
break;
case CheckBoxState.CheckedPressed:
checkBoxState = CheckBoxState.UncheckedPressed;
break;
case CheckBoxState.MixedDisabled:
checkBoxState = CheckBoxState.UncheckedDisabled;
break;
case CheckBoxState.MixedHot:
checkBoxState = CheckBoxState.UncheckedHot;
break;
case CheckBoxState.MixedNormal:
checkBoxState = CheckBoxState.UncheckedNormal;
break;
case CheckBoxState.MixedPressed:
checkBoxState = CheckBoxState.UncheckedPressed;
break;
default:
break;
}
return checkBoxState;
}
/// <summary>
/// Draw the check box in the checked or unchecked state, alternately.
/// </summary>
/// <param name="e">MouseEventArgs</param>
protected override void OnMouseDown(MouseEventArgs mouseEventArgs)
{
base.OnMouseDown(mouseEventArgs);
this.checkBoxState = this.Checked ? CheckBoxState.UncheckedNormal : CheckBoxState.CheckedPressed;
this.Invalidate();
}
/// <summary>
/// Draw the check box in the hot state.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseHover(EventArgs eventArgs)
{
base.OnMouseHover(eventArgs);
this.checkBoxState = this.Checked ? CheckBoxState.CheckedHot : CheckBoxState.UncheckedHot;
this.Invalidate();
}
/// <summary>
/// Draw the check box in the hot state.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseUp(MouseEventArgs mouseEventArgs)
{
base.OnMouseUp(mouseEventArgs);
this.OnMouseHover(mouseEventArgs);
}
/// <summary>
/// Draw the check box in the unpressed state.
/// </summary>
/// <param name="eventArgs"></param>
protected override void OnMouseLeave(EventArgs eventArgs)
{
base.OnMouseLeave(eventArgs);
this.checkBoxState = this.Checked ? CheckBoxState.CheckedNormal : CheckBoxState.UncheckedNormal;
this.Invalidate();
}
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
this.GetPartDetails();
}
/// <summary>
/// Get the sizes and offsets for the window parts as specified by the visual style.
/// </summary>
private void GetPartDetails()
{
// Do nothing further if visual styles are not enabled.
if (!Application.RenderWithVisualStyles)
{
return;
}
using (Graphics graphics = this.CreateGraphics())
{
if (this.SetRenderer(VisualStyleElement.Button.CheckBox.UncheckedNormal))
{
#region CheckMark
Size glyphSize = CheckBoxRenderer.GetGlyphSize(graphics, CheckBoxState.UncheckedNormal);
Point point = this.visualStyleRenderer.GetPoint(PointProperty.Offset);
this.checkMarkBounds = new Rectangle(point, glyphSize);
this.checkMarkBounds.Inflate(-3, -3);
#endregion // CheckMark
#region Text
this.glyphTextColor = this.visualStyleRenderer.GetColor(ColorProperty.GlyphTextColor);
if (!string.IsNullOrEmpty(this.Text))
{
TextMetrics textMetrics = this.visualStyleRenderer.GetTextMetrics(graphics);
Point textLocation = new Point(glyphSize.Width + textMetrics.InternalLeading, 0);
Rectangle textExtent = this.visualStyleRenderer.GetTextExtent(graphics, this.Text, TextFormatFlags.Left);
Size textSize = new Size(textExtent.Width - glyphSize.Width, textMetrics.Ascent);
this.textBounds = new Rectangle(textLocation, textSize);
this.textBounds.Location = textLocation;
}
#endregion // Text
}
}
}
/// <summary>
/// Set the VisualStyleRenderer to a new element.
/// </summary>
/// <param name="element">Visual style element to be set for the renderer.</param>
/// <returns>Returns true in case that a valid renderer has been returned.</returns>
private bool SetRenderer(VisualStyleElement visualStyleElement)
{
bool value = false;
if (VisualStyleRenderer.IsElementDefined(visualStyleElement))
{
if (visualStyleRenderer == null)
{
this.visualStyleRenderer = new VisualStyleRenderer(visualStyleElement);
}
else
{
this.visualStyleRenderer.SetParameters(visualStyleElement);
}
value = true;
}
return value;
}
}
}
Ny bruger
Nybegynder
Opret
Preview
