/// <summary>
/// Sets the cursor depending on whether the mouse cursor is on border.
/// </summary>
/// <param name="val">The hit test result.</param>
private void SetCursorOnBorder(PInvoke.HitTestValues val)
{
switch (val)
{
case PInvoke.HitTestValues.HTTOP:
case PInvoke.HitTestValues.HTBOTTOM:
Cursor.Current = Cursors.SizeNS;
break;
case PInvoke.HitTestValues.HTTOPRIGHT:
case PInvoke.HitTestValues.HTBOTTOMLEFT:
Cursor.Current = Cursors.SizeNESW;
break;
case PInvoke.HitTestValues.HTLEFT:
case PInvoke.HitTestValues.HTRIGHT:
Cursor.Current = Cursors.SizeWE;
break;
case PInvoke.HitTestValues.HTBOTTOMRIGHT:
case PInvoke.HitTestValues.HTTOPLEFT:
Cursor.Current = Cursors.SizeNWSE;
break;
default:
Cursor.Current = this.Cursor;
break;
}
}
/// <summary>
/// Handles the MouseDown event of the PanelContent control.
/// Specifically, this handles the resizing of the form.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
private void PanelContent_MouseDown(object sender, MouseEventArgs e)
{
// If the resizing is disabled, don't bother to check.
if (!this.Resizable)
{
return;
}
// Only handle left button click.
if (e.Button != System.Windows.Forms.MouseButtons.Left)
{
return;
}
// Disable when maximized
if (this.WindowState == FormWindowState.Maximized)
{
return;
}
// Determine if the border is clicked.
Point p = this.PointToClient(this.panelContent.PointToScreen(e.Location));
PInvoke.HitTestValues val = this.BorderHitTest(p);
if (val != PInvoke.HitTestValues.HTNOWHERE)
{
PInvoke.ReleaseCapture();
PInvoke.SendMessage(this.Handle, (int)PInvoke.WindowsMessages.WM_NCLBUTTONDOWN, (IntPtr)val, IntPtr.Zero);
}
}
/// <summary>
/// Handles the MouseMove event of the PanelContent control.
/// Used for changing the cursor dynamically.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
private void PanelContent_MouseMove(object sender, MouseEventArgs e)
{
// If the resizing is disabled, don't bother to check.
if (this.Resizable && this.WindowState != FormWindowState.Maximized && !this.DraggingTitleBar)
{
Point p = this.PointToClient(this.panelContent.PointToScreen(e.Location));
PInvoke.HitTestValues val = this.BorderHitTest(p);
this.SetCursorOnBorder(val);
}
}
/// <summary>
/// Handles the MouseDown event of the control buttons on the right hand side of the title bar.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
private void ControlButton_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left && this.Resizable && this.WindowState != FormWindowState.Maximized)
{
// Determine if the border is clicked.
Point p = this.PointToClient(((Control)sender).PointToScreen(e.Location));
PInvoke.HitTestValues val = this.BorderHitTest(p);
if (val != PInvoke.HitTestValues.HTNOWHERE)
{
PInvoke.ReleaseCapture();
PInvoke.SendMessage(this.Handle, (int)PInvoke.WindowsMessages.WM_NCLBUTTONDOWN, (IntPtr)val, IntPtr.Zero);
}
}
}
/// <summary>
/// Overrides the message loop.
/// </summary>
/// <param name="m">The Windows <see cref="T:System.Windows.Forms.Message" /> to process.</param>
protected override void WndProc(ref Message m)
{
switch ((PInvoke.WindowsMessages)m.Msg)
{
case PInvoke.WindowsMessages.WM_SETCURSOR:
PInvoke.HitTestValues val = this.BorderHitTest(this.PointToClient(Cursor.Position));
this.SetCursorOnBorder(val);
m.Result = (IntPtr)1;
break;
default:
base.WndProc(ref m);
break;
}
}
/// <summary>
/// Handles the MouseDown event of the panel title bar control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
private void PanelTitlebar_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
// Determine if the resizing border is clicked.
if (this.Resizable && this.WindowState != FormWindowState.Maximized)
{
Point p = this.PointToClient(this.panelTitlebar.PointToScreen(e.Location));
PInvoke.HitTestValues val = this.BorderHitTest(p);
if (val != PInvoke.HitTestValues.HTNOWHERE)
{
PInvoke.ReleaseCapture();
PInvoke.SendMessage(this.Handle, (int)PInvoke.WindowsMessages.WM_NCLBUTTONDOWN, (IntPtr)val, IntPtr.Zero);
return;
}
}
this.DraggingTitleBar = true;
if (this.WindowState == FormWindowState.Maximized)
{
Point offset = new Point();
if (this.RestoreBounds.Width >= this.Width || e.X < this.RestoreBounds.Width / 2)
{
offset = e.Location;
}
else if (e.X >= this.Width - (this.RestoreBounds.Width / 2))
{
offset = new Point(e.Location.X - (this.Width - this.RestoreBounds.Width), e.Location.Y);
}
else
{
offset = new Point(this.RestoreBounds.Width / 2, e.Location.Y);
}
this.draggingOffset = offset;
}
else
{
this.draggingOffset = e.Location;
}
}
else if (e.Button == MouseButtons.Right)
{
this.PopupSystemMenu(this.panelTitlebar.PointToScreen(e.Location));
}
}
/// <summary>
/// Handles the MouseMove event of the panel title bar control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
private void PanelTitlebar_MouseMove(object sender, MouseEventArgs e)
{
// If the resizing is disabled, don't bother to check.
if (this.Resizable && this.WindowState != FormWindowState.Maximized && !this.DraggingTitleBar)
{
Point p = this.PointToClient(this.panelTitlebar.PointToScreen(e.Location));
PInvoke.HitTestValues val = this.BorderHitTest(p);
this.SetCursorOnBorder(val);
}
// Title Bar Dragging.
if (this.DraggingTitleBar)
{
// Make it normal state before moving.
if (this.WindowState == FormWindowState.Maximized)
{
this.ToggleMaximize();
}
Point curScreenPos = this.PointToScreen(e.Location);
this.Location = new Point(curScreenPos.X - this.draggingOffset.X, curScreenPos.Y - this.draggingOffset.Y);
}
}
/// <summary>
/// Hit test against the border (padding) area.
/// </summary>
/// <param name="p">The position of the mouse cursor relative to the form.</param>
/// <returns>
/// The border position value in the HitTestValues enumeration. HTNOWHERE if not in any of the border area.
/// </returns>
private PInvoke.HitTestValues BorderHitTest(Point p)
{
PInvoke.HitTestValues val = PInvoke.HitTestValues.HTNOWHERE;
Padding pad = this.panelContent.Padding;
Size size = this.ClientSize;
// Outside the form.
if (p.X < 0 || p.X >= size.Width || p.Y < 0 || p.Y >= size.Height)
{
return(val);
}
// Within the titlebar area
if (0 <= p.Y && p.Y < this.panelTitlebar.Height)
{
if (pad.Left <= p.X && p.X < (size.Width - this.ResizingBorderWidth) && this.ResizingBorderWidth <= p.Y)
{
return(val);
}
pad.Top = Math.Max(this.ResizingBorderWidth, this.CornerSize);
pad.Right = Math.Max(this.ResizingBorderWidth, this.CornerSize);
pad.Bottom = Math.Max(pad.Bottom, this.CornerSize);
pad.Left = Math.Max(pad.Left, this.CornerSize);
}
else
{
if (pad.Left <= p.X && p.X < (size.Width - pad.Right) && p.Y < (size.Height - pad.Bottom))
{
return(val);
}
pad.Top = Math.Max(this.ResizingBorderWidth, this.CornerSize);
pad.Right = Math.Max(pad.Right, this.CornerSize);
pad.Bottom = Math.Max(pad.Bottom, this.CornerSize);
pad.Left = Math.Max(pad.Left, this.CornerSize);
}
bool top = 0 <= p.Y && p.Y < pad.Top;
bool right = (size.Width - pad.Right) <= p.X && p.X < size.Width;
bool bottom = (size.Height - pad.Bottom) <= p.Y && p.Y < size.Height;
bool left = 0 <= p.X && p.X < pad.Left;
if (top)
{
if (left)
{
val = PInvoke.HitTestValues.HTTOPLEFT;
}
else if (right)
{
val = PInvoke.HitTestValues.HTTOPRIGHT;
}
else
{
val = PInvoke.HitTestValues.HTTOP;
}
}
else if (bottom)
{
if (left)
{
val = PInvoke.HitTestValues.HTBOTTOMLEFT;
}
else if (right)
{
val = PInvoke.HitTestValues.HTBOTTOMRIGHT;
}
else
{
val = PInvoke.HitTestValues.HTBOTTOM;
}
}
else
{
if (left)
{
val = PInvoke.HitTestValues.HTLEFT;
}
else if (right)
{
val = PInvoke.HitTestValues.HTRIGHT;
}
}
return(val);
}
