Usually this kind of program has a tool palette that contains the various tools.
The palette is non modal, meaning that you don't block the execution of code in the first form when you show the palette. It stays in some corner and you click over the icons in the palette to change your behavior.
But, if this is the case, then passing back information to form1 requires a delegate and an event handler
So, inside Form2 code you have
public enum ToolEnum
{
Draw = 1,
Rubber = 2,
Fill = 3,
......
}
public class Form2
{
public delegate void OnToolChanged(ToolEnum newTool);
public event OnToolChanged ToolChanged;
....
protected override palette_Click(object sender, EventArgs e)
{
// Code that retrieves the tool clicked....
ToolEnum choosenTool = GetTool();
// If someone is interested to know when the user changes tool
// then it has subscribed to the ToolChanged event passing an
// appropriate event handler
if(ToolChanged != null)
ToolChanged(choosenTool);
}
}
The form1 call the form2 in this way
// Open the form with the palette passing reference to this instance of form1.
// Important to link the two forms together....
Form2 f = new Form2(this);
// Now inform the form2 instance that this instance of form1
// wants to know when the user clicks another tool
f.ToolChanged += myToolChangedHandler;
....
// We receive here the notification of the click event on the palette form
public void myToolChangedHandler(ToolEnum newTool)
{
if(newTool == ToolEnum.Fill)
{
... adapt for the fill operation ...
}
}
EDIT
However, if you want the follow the simpler road of showing modally your Form2, then the code is easy
private void brushBtn_Click(object sender, EventArgs e)
{
//New form which will ask which brush type and the size
using(Form2 paintInfo = new Form2())
{
paintInfo.ShowDialog();
int brushType = paintInfo.BrushType;
}
}
....
public partial class Form2: Form
{
public Form2()
{
InitializeComponent();
}
int typeOfBrush;
public int BrushType
{
get {return typeOfBrush;}
set {typeOfBrush = value;}
}
private void circleBrushBtn_Click(object sender, EventArgs e)
{
this.BrushType = 1 ;
}
}
