I have a windows form without any border.
So i added a picture box and i want the whole form to be moved when that picture box is clicked.
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd,
int Msg, int wParam, int lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
private void header_image_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
That is the code which i am using atm.But my problem is that if i move cursor very fast it is not sticked on the picture box.
I tried to find a solution but nothing came up.
I used some info from those 2 links:
link 1
link 2
Any ideas?
EDIT:
Here is the whole code of my form
public Form1()
{
InitializeComponent();
}
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd,
int Msg, int wParam, int lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
private void header_image_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
Refer this code:
private bool draging = false;
private Point pointClicked;
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (draging)
{
Point pointMoveTo;
pointMoveTo = this.PointToScreen(new Point(e.X, e.Y));
pointMoveTo.Offset(-pointClicked.X, -pointClicked.Y);
this.Location = pointMoveTo;
}
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
draging = true;
pointClicked = new Point(e.X, e.Y);
}
else
{
draging = false;
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
draging = false;
}
Use the MouseMove() event instead of MouseDown():
private void header_image_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
ReleaseCapture();
SendMessage(this.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
Related
In C# WinForm desktop application initialization I have custom caret event handler:
public Form1()
{
InitializeComponent();
textBox1.GotFocus += new EventHandler(textBox1_GotFocus);
}
then textBox1_KeyDown shows caret:
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
ShowCaret(textBox1.Handle);
}
And from textBox1_TextChanged:
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (textBox1.Text.Length > 0)
{
int x = 0;
DrawCaret(textBox1, x);
}
else if (textBox1.Text.Length < 1)
{
int x = 1;
DrawCaret(textBox1, x);
}
}
And:
[DllImport("user32.dll")]
static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth, int nHeight);
[DllImport("user32.dll")]
static extern bool ShowCaret(IntPtr hWnd);
void textBox1_GotFocus(object sender, EventArgs e)
{
int x = 1;
DrawCaret(textBox1, x);
}
int size;
public void DrawCaret(Control ctrl, int x)
{
if (x == 0) { size = 2; }
else { size = 15; }
var nHeight = textBox1.Height;
var nWidth = size;
nHeight = Font.Height;
CreateCaret(ctrl.Handle, IntPtr.Zero, nWidth, nHeight);
}
I get:
System.ObjectDisposedException' occurred in ShowCaret(ctrl.Handle);
Which shows exception on code line:
CreateCaret(ctrl.Handle, IntPtr.Zero, nWidth, nHeight);
But attached to static extern bool ShowCaret(IntPtr hWnd); above.
Can't figure out what causes this exception
Any guide, advice or example would be helpful
Could someone explain to me how this code work
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
private void mainForm_MouseDown(object sender, MouseEventArgs e)
{ //When a mouseButton is pressed down on the form
if (e.Button == MouseButtons.Left)
{ // if it is mouseButton1
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
I know it gives my form the possibility of being dragged around, but i don't understand how.
Thanks!
I want to send message to other process already running. What wrong...? why I am not able to receive messages
My sender code is as below
public partial class RegisterWindowMessage : Form
{
[DllImport("User32.dll", EntryPoint = "SendMessage")]
//private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
private static extern int SendMessage(IntPtr hWnd, int Msg, string s, int i);
const int WM_SETTEXT = 0X000C;
public RegisterWindowMessage()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Process[] procs = Process.GetProcesses();
foreach (Process p in procs)
{
if (p.ProcessName.Equals("TaskScheduling"))
{
IntPtr hWnd = p.MainWindowHandle;
Thread.Sleep(1000);
SendMessage(hWnd, WM_SETTEXT, "This is the new Text!!!", 0);
MessageBox.Show("Inside");
}
}
}
private void button2_Click(object sender, EventArgs e)
{
}
}
My receiver code is
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
}
private void frmReceiver_KeyDown(object sender, KeyEventArgs e)
{
// this.lsvMsgList.Items.Add(e.KeyValue.ToString());
}
protected override void WndProc(ref Message m)
{
MessageBox.Show(m.Msg.ToString());
MessageBox.Show(m.LParam.ToString());
MessageBox.Show(m.WParam.ToString());
if (m.LParam.ToInt32() == 1)
{
}
else
{
base.WndProc(ref m);
}
}
}
I want to know why i am not able to receive message. Let me know where I am wrong
I was looking on this forum earlier to help with this issue i am having. Basically I am dynamically creating a form from a class which i want to be draggable around the screen without the title bars. The code i came across is :
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern bool ReleaseCapture();
private void window_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
However when i try to compile I get the following error:
Error 1 The name 'Handle' does not exist in the current
context C:\Users\xxxxxx\Documents\Visual Studio
2013\Projects\practiceProgressBar2\practiceProgressBar2\Notifications.cs 109 29 practiceProgressBar2
Does anyone know what I am doing wrong as I have been tackling this all day
Change:
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
To:
SendMessage(((Form)sender).Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
If you have other controls, like Labels, pointing to that same handler, then you could use this instead to make it drag when you also drag the Labels:
SendMessage(((Control)sender).FindForm().Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
Try overriding the form's WndProc method instead.
public const int HTCAPTION = 0x2;
public const int WM_NCHITTEST = 0x84;
public const int HTCLIENT = 1;
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_NCHITTEST)
{
if (m.Result.ToInt32() == HTCLIENT)
m.Result = (IntPtr)HTCAPTION;
}
}
I been searching around for a solution for my problem but for now I wasn't able to get any sucessfull code for what I want to do. So, I have a form without border that is filled with 2 custom panels, so there is no way to the user click on the frame, thinking in that, I implement a code that when user click on a panel, this will call a function on my form that recive by parameter the event of the mouse.
This is the code of my Panel (note that both of my panels in the frame are the same class, it's just 2 diferent instances)
public class MyPanel : System.Windows.Forms.Panel{
(...)
private void MyPanel_MouseDown(object sender, MouseEventArgs e)
{
BarraSms.getInstance().mouseDown(e);
}
private void MyPanel_MouseMove(object sender, MouseEventArgs e)
{
BarraSms.getInstance().mouseMove(e);
}
}
And this is the code of my form:
public partial class BarraSms : Form
{
private Point mousePoint;
(...)
public void mouseDown(MouseEventArgs e) {
mousePoint = new Point(-e.X, -e.Y);
}
public void mouseMove(MouseEventArgs e) {
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
Point mousePos = Control.MousePosition;
mousePos.Offset(mousePoint .X, mousePoint .Y);
this.Location = mousePos;
}
}
}
Is there something that I'm missing?
Thank you in advance for the help.
The working code (update), problem solved by: x4rf41
The MyPanel Class :
MouseMove += MyPanel_MouseMove; // added in class constructer
the BarraSms class (Form)
public partial class BarraSms : Form
{
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
public void mouseMove(MouseEventArgs e) {
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
ReleaseCapture();
SendMessage(this.Handle, WM_NCLBUTTONDOWN, new IntPtr(HT_CAPTION), IntPtr.Zero);
Point loc = this.Location;
writeCoordToBin(loc.X, loc.Y);
}
}
}
There is much better solution for that using the windows api function.
The way you use it, you will have a problem when you move the form very fast and the mouse goes out of the panel. I had the exact same problem.
try this:
using System.Runtime.InteropServices;
and in your Form class
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
public void mouseMove(MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
ReleaseCapture();
SendMessage(this.Handle, WM_NCLBUTTONDOWN, new IntPtr(HT_CAPTION), IntPtr.Zero);
}
}
no need for a mouseDown event for this
Your private methods in MyPanel cannot be called by the framework. You need to declare them as follows:
protected override void OnMouseDown(MouseEventArgs e)
{
var parent = this.Parent as BarraSms;
parent.mouseDown(e);
}
protected override void OnMouseMove(MouseEventArgs e)
{
var parent = this.Parent as BarraSms;
parent.mouseMove(e);
}
Try this:
public void mouseMove(MouseEventArgs e) {
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
Point currentPos = Location;
currentPos.Offset(e.X + mousePoint.X, e.Y + mousePoint.Y);
this.Location = currentPos;
}
//Or simply use Location.Offset(e.X + mousePoint.X, e.Y + mousePoint.Y);
}
You have to use Location (the current location of the form), not the Control.MousePosition which is the location of mouse on screen.
UPDATE: Looks like you don't even know how to register event handlers, try modifying your panel class like this:
public class MyPanel : System.Windows.Forms.Panel{
//(...)
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
BarraSms.getInstance().mouseDown(e);
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
BarraSms.getInstance().mouseMove(e);
}
}