RE: Designer doesn't update the window/form region based on subclassing
- From: v-lliu@xxxxxxxxxxxxxxxxxxxx (Linda Liu [MSFT])
- Date: Wed, 28 Mar 2007 07:57:37 GMT
Hi Liviu,
I am sorry that I may not understand your question exactly.
Now if a new form(Form2) is created that subclasses Form1 the designerwill restrict the viewable portion to the default size of Form1.
What do you mean by "the default size"?
Below is my test and comments.
I set the Region property of Form1in its Load event handler as follows:
private void Form1_Load(object sender, EventArgs e)
{
System.Drawing.Drawing2D.GraphicsPath path = new
System.Drawing.Drawing2D.GraphicsPath();
Rectangle newrect = this.ClientRectangle;
path.AddEllipse(newrect);
this.Region = new Region(path);
}
Build the project and add an inherited form called Form2 into the project.
When I open Form2 in the designer, I see a circular form in the designer.
I should say that this behavior is by design. When we open a derived form
in the designer, an instance of the base form is created. Thus the
constructor of the base form is called and then the Load event handler.
This is the reason why I see a circular form when I open Form2 in the
designer.
If you don't like the code to set the Region property of the base form to
be called at design time, you may add a condition "!this.DesignMode" on the
code.
The following is a sample.
private void Form1_Load(object sender, EventArgs e)
{
if (!this.DesignMode)
{
System.Drawing.Drawing2D.GraphicsPath path = new
System.Drawing.Drawing2D.GraphicsPath();
Rectangle newrect = this.ClientRectangle;
path.AddEllipse(newrect);
this.Region = new Region(path);
}
}
Build the project and re-open Form2, you should see a rectangle form in the
designer.
Hope this helps.
If you have any question, please feel free to let me know.
Sincerely,
Linda Liu
Microsoft Online Community Support
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