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This is an example of moving a form by dragging its
body
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Creating and Implementing the Common Event |
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- Start Microsoft Visual C++ .Net and create a Windows Form
Application named MoveMe
- Add a few control to the body of the form
- Double-click an empty area in the body of the form to access its Load event
- Declare a Boolean variable named MouseIsDown and initialize it to
false in the Load event of the form:
#pragma once
namespace MoveMe
{
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
/// <summary>
/// Summary for Form1
///
/// WARNING: If you change the name of this class, you will need to change the
/// 'Resource File Name' property for the managed resource compiler tool
/// associated with all .resx files this class depends on. Otherwise,
/// the designers will not be able to interact properly with localized
/// resources associated with this form.
/// </summary>
public __gc class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
}
protected:
void Dispose(Boolean disposing)
{
if (disposing && components)
{
components->Dispose();
}
__super::Dispose(disposing);
}
private:
/// <summary>
/// Required designer variable.
/// </summary>
System::ComponentModel::Container * components;
bool MouseIsDown;
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
//
// Form1
//
this->AutoScaleBaseSize = System::Drawing::Size(5, 13);
this->ClientSize = System::Drawing::Size(292, 266);
this->Name = S"Form1";
this->Text = S"Form1";
this->Load += new System::EventHandler(this, Form1_Load);
}
private: System::Void Form1_Load(System::Object * sender, System::EventArgs * e)
{
MouseIsDown = false;
}
};
}
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- Click the form
- In the Properties window, click the Events button
- Double-click the right side of MouseDown
- Declare two integer variables in the class. Call them OldX and OldY
- Implement the MouseDown event as follows:
#pragma once
namespace MoveMe
{
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
/// <summary>
/// Summary for Form1
///
/// WARNING: If you change the name of this class, you will need to change the
/// 'Resource File Name' property for the managed resource compiler tool
/// associated with all .resx files this class depends on. Otherwise,
/// the designers will not be able to interact properly with localized
/// resources associated with this form.
/// </summary>
public __gc class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
}
protected:
void Dispose(Boolean disposing)
{
if (disposing && components)
{
components->Dispose();
}
__super::Dispose(disposing);
}
private:
/// <summary>
/// Required designer variable.
/// </summary>
System::ComponentModel::Container * components;
bool MouseIsDown;
int OldX, OldY;
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
//
// Form1
//
this->AutoScaleBaseSize = System::Drawing::Size(5, 13);
this->ClientSize = System::Drawing::Size(292, 266);
this->Name = S"Form1";
this->Text = S"Form1";
this->MouseDown +=
new System::Windows::Forms::MouseEventHandler(this, Form1_MouseDown);
this->Load += new System::EventHandler(this, Form1_Load);
}
private: System::Void Form1_Load(System::Object * sender, System::EventArgs * e)
{
MouseIsDown = false;
}
private: System::Void Form1_MouseDown(System::Object * sender,
System::Windows::Forms::MouseEventArgs * e)
{
if( e->Button == MouseButtons::Left )
{
OldX = e->X;
OldY = e->Y;
MouseIsDown = true;
}
}
};
}
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- Click the form and, in the Properties window, click the Events
button
- Double-click the right side of MouseDown and implement the event as
follows:
private: System::Void Form1_MouseMove(System::Object * sender, System::Windows::Forms::MouseEventArgs * e)
{
int TempX, TempY;
if( MouseIsDown == true )
{
TempX = e->X - OldX;
TempY = e->Y - OldY;
Top = Top + TempY;
Left = Left + TempX;
}
}
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- Click the form and, in the Properties window, click the Events
button
- Double-click the right side of MouseUp and implement the event as
follows:
private: System::Void Form1_MouseUp(System::Object * sender, System::Windows::Forms::MouseEventArgs * e)
{
MouseIsDown = false;
}
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- Test the application
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