1.
C++.NET
Windows Forms Course
L02 – Controls Part 1
Mohammad Shaker
mohammadshakergtr.wordpress.com
C++.NET Windows Forms Course
@ZGTRShaker

2.
Controls
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Form
Button
CheckBox
CheckedListBox
ComboBox
Label
ListBox
PictureBox
•
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ProgressBar
RadioButton
TextBox
Panel
TabControl
DataGridView
Timer

3.
Windows Forms

4.
Form’s Properties
Form’s Events
The Form is selected

5.
Control Properties and Events
• Applications :
– Design Time VS runtime
• Controls :
– Properties
• Width , color .. etc
– Events
• MouseClick , MouseHover , DragDrop .. etc

6.
Your First Form: Form1

7.
Form’s Properties
– Properties :
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BackColor
AutoSize
Font
Location
Opacity
Size (width , Height )
Text

8.
Form’s Events
– Event :
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Load
Click
KeyUp down ….
MouseOver Down leave …
ResizeBegin End
TextChange
Validation
FormClosing
Form Closed
(imp.)

9.
Form at Design Time
With Form1 being selected

10.
Form at Design Time
With Form1 being selected

11.
.ico extension

12.
Forms Live Testing
Changing Properties at runtime through Events

13.
Button

14.
23

15.
Button
– Properties :
– Name , Text , Font , image , Location , Size , TabStop , TabIndex ,
Visible , BackColor
– Event :
– MouseClick , MouseDown , MouseLeave , Resize , SizeChange ,
TextChanged , VisibleChanged , KeyUp , KeyDown , DragDrop

16.
Changing properties at runtime
• Considering we have the following design (at design time)

17.
Changing properties at runtime
• Adding the following button event
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
button1 -> Text="I'm button1!!";
}
Control
Property
Valid value

18.
Changing properties at runtime
• Adding the following button event
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
button1 -> Text="I'm button1!!";
}
Object (intsance)
Reference button by
its name
Data Member
Valid value

19.
Changing properties at runtime
After clicking the button

20.
Changing properties at runtime
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
Form1 -> Text=" Hello World ”;
}
Member
Valid value

21.
Changing properties at runtime
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
Form1 -> Text=" Hello World ”;
}
Member
Valid value

22.
Changing properties at runtime
• Now , let’s change the “Form”’s Text property .
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
Form1 -> Text=" Hello World ”;
}
Member
Valid value

23.
Changing properties at runtime
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
this -> Text="Hello World";
}
Object at runtime
(reference to Form1)
Since we are inside
the Form1 class
Member
Value

24.
Changing properties at runtime
After Clicking the Button

25.
Changing properties at runtime
• Now , let’s change the “Form”’s Opacity property .
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
this -> Opacity=20;
}
Class
Member
Valid value

26.
Changing properties at runtime
• Now , let’s change the “Form”’s Opacity property .
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
this -> Opacity=20;
}
Class
Member
Valid value

27.
Changing properties at runtime
• Now , let’s change the “Form”’s Opacity property .
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
this -> Opacity=0.2;
}
Class
Member
Valid value

28.
Changing properties at runtime
After Clicking the Button

29.
Message Box

30.
MessageBox
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
MessageBox::Show("Hello!!!");
}

31.
Let the .NET write for you.
Intellisense is ready to help you!
(Problem in 2010 and afterward)

32.
21 Overload!

33.
Form
Hide() vs Close()

34.
Form Hide() vs Close()
What’s the difference between these two:
private: System::Void button1_Click(System::Object^
System::EventArgs^ e)
{
this->Hide();
}
sender,
private: System::Void button1_Click(System::Object^
System::EventArgs^ e)
{
this->Close();
}
sender,

35.
Form – Hide problem!
Consider that we have only one form and we write the
following code:
private: System::Void Form1_Load(System::Object^
sender, System::EventArgs^ e)
{
this->Hide();
}
The form won’t be hidden on loading!

36.
Form – Hide problem!
What happens now when breaking the project and run it again?
private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
this->Hide();
}
It won’t compile! When hiding the form , the project is still processed!!!
So we should terminate its process first from task manager

37.
Opacity Problem , too!

38.
The applications are hidden but
not closed. All the memory
allocated by each hidden
application is still there

39.
Application class

40.
Application class
• Hierarchy :
– System.Windows.Forms
• Methods :
– Run
– Exit

41.
Application class – Exit Method
• Informs all message pumps that they must terminate, and
then closes all application windows after the messages have
been processed.
Application::Exit();

42.
Application class – Exit Method
• What will happen now?
The whole application (with all forms) will simply close and
the resources will be freed.
private: System::Void Form1_Load(System::Object^
System::EventArgs^ e)
{
Application::Exit();
}
sender,

43.
Exit() vs Close()
• What’s the difference?
Application::Exit();
this->Close();

44.
Managed vs Un-Managed
CODE

45.
Managed VS Un-Managed
• Usually …
– Managed : .NET
– Un-Managed : C++
• gcnew
– Garbage collector

46.
Managed VS Un-Managed
• Usually …
– Managed : .NET
– Un-Managed : C++
• gcnew
– Garbage collector

47.
Managed VS Un-Managed
• Stack heap “Un-Managed heap” managed heap
int MyVar=10;
stack
int *Ptr=new int;
Un-Managed heap
int ^Ptr=gcnew int; managed heap
• What’s the problem then?!!

48.
Managed VS Un-Managed
• Let’s have the following, anything wrong?
int *Ptr=new int;
Ptr=NULL;
Un-Managed heap
It’s a leaking in memory!
int ^Ptr=gcnew int; managed heap
Ptr=NULL;
Not a leak anymore!

49.
Managed VS Un-Managed
• Let’s have the following, anything wrong?
int *Ptr=new int;
Ptr=NULL;
Un-Managed heap
It’s a leaking in memory!
int ^Ptr=gcnew int; managed heap
Ptr=NULL;
Not a leak anymore!

50.
Which one of these works?
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size *S;
S->Height=200;
S->Width=300;
this->Size=*S;
}
there’s no new unmanaged
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size *S=gcnew Drawing::Size;
S->Height=200;
S->Width=300;
this->Size=*S;
gcnew with * unmanaged with managed
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size *S=new Drawing::Size;
S->Height=200;
S->Width=300;
this->Size=*S;
WORKS! unmanaged
}

51.
Which one of these works?
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size *S=new Size;
S->Height=200;
S->Width=300;
this->Size=*S;
Un-Known Size identifier “3’laza :D”
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size ^S=gcnew Drawing::Size;
S->Height=200;
S->Width=300;
this->Size=*S;
}
Works! managed
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size ^S=gcnew Drawing::Size;
S->Height=200;
S->Width=300;
this->Size=^S;
}
Compiler error .. No such

52.
Which one of these works?
private: System::Void button1_Click_1(System::Object^
System::EventArgs^ e)
{
Drawing::Size ^S;
S->Height=200;
S->Width=300;
this->S=^S;
}
Error .. ^
sender,
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
Drawing::Size ^S=new Drawing::Size;
S->Height=200;
S->Width=300;
this->Size=^S;
}
Should be gcnew , not new

53.
Which one of these works?
private: System::Void button1_Click_1(System::Object^
sender, System::EventArgs^ e)
{
this->Size=Drawing::Size(200,300);
}
Works!

54.
Which one of these works?
private: System::Void button1_Click_1(System::Object^
sender, System::EventArgs^ e)
{
this->Size=Drawing::Size(200,300);
}
Works!

55.
References
msdn Awesome library
C++ , C# , VB.NET , ASP.NET , XNA , XML ... etc
http://msdn.microsoft.com/en-us/library/default.aspx

56.
That’s it for today!