C # Custom Control Development Instance (2)

Control | Control development source file: Http://ded.nuaa.edu.cn/download/Windows%20Extended%20Controls.rar

Sample code: Http://ded.nuaa.edu.cn/download/WindowsApplication6.rar

Let's talk about how the control works, first by writing his attributes, and by overriding his attributes,
Private color _bordercolor=new color ();
[DefaultValue ("Black"), Description ("Border Color"), Category ("appearance")]
Public Color BorderColor
{
Get
{
Insert code here.
return _bordercolor;
}
Set
{
_bordercolor=value;
This. Invalidate ();
}
}
DefaultValue: Set default value, Description: Description, is the description of the attribute, Category: attribute classification. The other same thing.
When you set a property, you should rewrite his drawing process, which is
protected override void OnPaint (PaintEventArgs pe)
{
Calling the base class OnPaint
Base. OnPaint (PE);
Redrawcontrol (PE. Graphics);
}
private void Redrawcontrol (Graphics Graphics)
{

Try
{
Draw Border
Rectangle rectborder=new Rectangle ();
Pen borderpen=new Pen (this._bordercolor,1);
rectborder.x = 7;
RECTBORDER.Y = 7;
Rectborder.height = this. Height-15;
Rectborder.width = this. Width-15;
Graphics. DrawRectangle (Borderpen, Rectborder);
Draw an edit box
if (_resizeble)
{
Drawselector (graphics);
}
}
catch (Exception E)
{
Throw E;
}
Finally
{
Graphics. Dispose ();
}
}
[Description ("Control selection Area"), Category ("Behavior")]
Public Rectangle Selectrectangle
{
Get
{
Rectangle selectrectangler=new Rectangle ();
Selectrectangler.x = this. location.x+7;
Selectrectangler.y = this. location.y+7;
Selectrectangler.height = this. Height-15;
Selectrectangler.width = this. Width-15;
return selectrectangler;
}

}

The rectangle (rectangle) is defined in Redrawcontrol, so that the rectangle is filled with a rectangular border: graphics. DrawRectangle (Borderpen, rectborder); Here's what you're going to say. There is also an edit box outside the border, so the size is not the size of the control. Drawselector is to draw 8 selection boxes, basic and draw the border almost, even if the definition of good coordinates. Don't forget to release the resource after you've done it: graphics. Dispose ();

Selectrectangle: The rectangle that the control chooses, it's the end of it.

OK, so a basic thing came out, and here we're going to write his move and resize functions, add the event first:


This. Resize + = new System.EventHandler (this. Shapeex_resize);
This. MouseUp + = new System.Windows.Forms.MouseEventHandler (this. Shapeex_mouseup);
This. MouseMove + = new System.Windows.Forms.MouseEventHandler (this. Shapeex_mousemove);
This. MouseLeave + = new System.EventHandler (this. Shapeex_mouseleave);
This. MouseDown + = new System.Windows.Forms.MouseEventHandler (this. Shapeex_mousedown);
Principle: When the mouse clicks this. MouseDown, record the position of the mouse, the original position and size of the control, determine the location: _rectleftbottomselector.contains (E.X,E.Y): Click on the left, set the mouse, record status this._ Selectselctedindex: Judge clicks on the selection box, takes a value of 0-8:0 means to move the entire control, 1 is to move the top right, 2-8 clockwise index selection box. This. MouseMove How to change the size and position of a control
Case 0://only Move position
This. Location=new Point (cursor.position.x-(_mouselocation.x-_selflocation.x), cursor.position.y-(_MouseLocation.Y-_ SELFLOCATION.Y));
Break
1,5 not only move the position, but also change the size, 2,3,4,6,7,8 only change the size

Others are clean-up work.

Well, then hurry up and compile. Build on it.