C++ Windows Forms L03 - Controls P2

C++.NET
Windows Forms Course
L03 – Controls Part 2

Mohammad Shaker
mohammadshakergtr.wordpress.com
C++.NET Windows Forms Course
@ZGTRShaker

Switching to a another forms
• Let’s consider that we want to have two forms and we want
to switch between them
– #1: First of all we add a new “second” form to out project
• Add > new item > form

– #2: include its header in first form header file
– ( “Form1.h” file )
#include "Form2.h"
– #3: pointing to the other form
Form2 ^f= gcnew Form2;
– #4: and start playing with it :D
f->Show();

Switching Back to Form1
• In “Form2.h”
namespace MyTestPro {
ref class Form1;
public: Form1 ^FPtr;
Form2(Form1 ^f)
{
InitializeComponent();
FPtr= f;
}

Switching Back to Form1
• In “Form2.cpp”
#include "StdAfx.h"
#include "Form2.h"
#include "Form1.h”
namespace MyTestPro {
System::Void Form2::Form2_Load(System::Object^
System::EventArgs^ e)
{
FPtr->Text= “New Form1 Text!";
}
}

sender,

Peak on Drawing Class
Point & Size

Peak on Drawing::Point
• What will happen now?

private: System::Void button1_Click(System::Object^
sender, System::EventArgs^ e)
{
button1->Location= 30,120;
}

Peak on Drawing::Point
private: System::Void button1_Click(System::Object^
{
Drawing::Point P;
P.X= 2;
P.Y= 23;
button1->Location= P;
}

sender,

Helpers

So, what should
we do?

Point and Size
• Can we do this? Yes!
private: System::Void button1_Click_1(System::Object^
{
Drawing::Size S;
S.Height= 200;
S.Width= 300;
this->Size= S;
}

sender,

Point and Size
• Can we do this?
{
Drawing::Size ^S;
S->Height= 200;
S->Width= 300;
this->Size= S;
}

sender,

Compile error
Error
1
error C2664: 'void
System::Windows::Forms::Control::Size::set(System::Drawing::Size)':
cannot convert parameter 1 from 'System::Drawing::Size ^' to
'System::Drawing::Size'
c:userszgtrdocumentsvisual studio
2008projectsdotnet4dotnet4Form1.h 129
dotNet4

Point and Size
sender, System::EventArgs^ e)
{
this->Size= Drawing::Size(200,300);
}
Works!

Label
• Properties:
Name, Text, Font, image, Location, Size, TabStop, TabIndex,
Visible, BackColor

• Event:
MouseClick, MouseDown, MouseLeave, Resize, SizeChange,
TextChanged, VisibleChanged, KeyUp, KeyDown, DragDrop

TextBox
• Properties:
Visible, BackColor, MultiLine, ScrollBar

• Event:

Panel
• Properties:
Visible, BackColor, Border Style, AutoSize

• Event:

TrackBar

Keyboard keys (Arrows)
Number of ticks between tick
marks
position

TrackBar
private: System::Void trackBar1_Scroll(System::Object^
{
textBox1->Text= trackBar1->Value.ToString();
}

sender,

ProgressBar
• Increment the progressBar and perform the “performStep()”
• What will happen when pressing the button?
{
progressBar1->PerformStep();
}

sender,

ProgressBar
• What will happen now when pressing the button, repeatedly?
private: System::Void button1_Click_4(System::Object^ sender,
{
progressBar1->PerformStep();
textBox1->Text= progressBar1->Value.ToString();
}

ProgressBar

Before clicking button1

After clicking button1 for 1st time

After clicking button1 for 2nd time

ProgressBar
• Another example:
– The following code example uses a ProgressBar control to display the
progress of a file copy operation. The example uses
the Minimum and Maximum properties to specify a range for
the ProgressBar that is equivalent to the number of files to copy. The
code also uses the Step property with the PerformStep method to
increment the value of theProgressBar as a file is copied. This example
requires that you have a ProgressBar control created called pBar1 that
is created within a Form and that there is a method created
called CopyFile (that returns a Boolean value indicating the file copy
operation was completed successfully) that performs the file copy
operation. The code also requires that an array of strings containing
the files to copy is created and passed to
the CopyWithProgress method defined in the example and that the
method is called from another method or event in the Form.

private:
void CopyWithProgress( array<String^>^filenames )
{
// Display the ProgressBar control.
pBar1->Visible= true;
// Set Minimum to 1 to represent the first file being copied.
pBar1->Minimum= 1;
// Set Maximum to the total number of files to copy.
pBar1->Maximum= filenames->Length;
// Set the initial value of the ProgressBar.
pBar1->Value= 1;
// Set the Step property to a value of 1 to represent each file being
copied.
pBar1->Step= 1;
// Loop through all files to copy.
for ( int x= 1; x <= filenames->Length; x++ )
{
// Copy the file and increment the ProgressBar if successful.
if ( CopyFile( filenames[ x - 1 ] )== true )
{
// Perform the increment on the ProgressBar.
pBar1->PerformStep();
}
}
}

NumericUpDown properties
The interval

Starting value

NumericUpDown - coding
• Text property
{
textBox1->Text= numericUpDown1->Text;
}

sender,

• Everything ok?

private: System::Void textBox1_TextChanged(System::Object^
{
numericUpDown1->Value=

textBox1->Text;

}
Compiler error. String assigned to int

sender,

• As always, we can change anything at runtime

{
numericUpDown1->Value=
}

int::Parse(textBox1->Text);

sender,


sender,

{
int i =int::TryParse(textBox1->Text, numericUpDown1->Value);
}


{
numericUpDown1->Text=
}

textBox1->Text;

sender,

PictureBox
• Very important for drawing!

C++ Windows Forms L03 - Controls P2

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C++ Windows Forms L03 - Controls P2