private void OnTargetWindowHandleRecreated(object sender, EventArgs e)
{
// in the case that the handle for the form is recreated we need to set
// up the handles to point to the new window handle for the form.
system.SetNativeTargetWindow(target);
minimize.SetNativeTargetWindow(target);
close.SetNativeTargetWindow(target);
restore.SetNativeTargetWindow(target);
IntPtr hMenu = UnsafeNativeMethods.GetSystemMenu(new HandleRef(this, Control.GetSafeHandle(target)), /*bRevert=*/ false);
system.SetNativeTargetMenu(hMenu);
minimize.SetNativeTargetMenu(hMenu);
close.SetNativeTargetMenu(hMenu);
restore.SetNativeTargetMenu(hMenu);
// clear off the System DropDown.
if (system.HasDropDownItems)
{
// next time we need one we'll just fetch it fresh.
system.DropDown.Items.Clear();
system.DropDown.Dispose();
}
system.Image = GetTargetWindowIcon();
}
private void OnSystemMenuDropDownOpening(object sender, EventArgs e)
{
if (!system.HasDropDownItems && (target != null))
{
system.DropDown = ToolStripDropDownMenu.FromHMenu(UnsafeNativeMethods.GetSystemMenu(new HandleRef(this, Control.GetSafeHandle(target)), /*bRevert=*/ false), target);
}
else if (MergedMenu == null)
{
system.DropDown.Dispose();
}
}
/// <devdoc> target is ideally the MDI Child to send the system commands to.
/// although there's nothing MDI child specific to it... you could have this
/// a toplevel window.
/// </devdoc>
public MdiControlStrip(IWin32Window target)
{
IntPtr hMenu = UnsafeNativeMethods.GetSystemMenu(new HandleRef(this, Control.GetSafeHandle(target)), /*bRevert=*/ false);
this.target = target;
// The menu item itself takes care of enabledness and sending WM_SYSCOMMAND messages to the target.
minimize = new ControlBoxMenuItem(hMenu, NativeMethods.SC_MINIMIZE, target);
close = new ControlBoxMenuItem(hMenu, NativeMethods.SC_CLOSE, target);
restore = new ControlBoxMenuItem(hMenu, NativeMethods.SC_RESTORE, target);
// The dropDown of the system menu is the one that talks to native.
system = new SystemMenuItem();
// However in the event that the target handle changes we have to push the new handle into everyone.
Control controlTarget = target as Control;
if (controlTarget != null)
{
controlTarget.HandleCreated += new EventHandler(OnTargetWindowHandleRecreated);
controlTarget.Disposed += new EventHandler(OnTargetWindowDisposed);
}
// add in opposite order to how you want it merged
this.Items.AddRange(new ToolStripItem[] { minimize, restore, close, system });
this.SuspendLayout();
foreach (ToolStripItem item in this.Items)
{
item.DisplayStyle = ToolStripItemDisplayStyle.Image;
item.MergeIndex = 0;
item.MergeAction = MergeAction.Insert;
item.Overflow = ToolStripItemOverflow.Never;
item.Alignment = ToolStripItemAlignment.Right;
item.Padding = Padding.Empty;
// image is not scaled well on high dpi devices. Setting property to fit to size.
item.ImageScaling = ToolStripItemImageScaling.SizeToFit;
}
// set up the sytem menu
system.Image = GetTargetWindowIcon();
system.Alignment = ToolStripItemAlignment.Left;
system.DropDownOpening += new EventHandler(OnSystemMenuDropDownOpening);
system.ImageScaling = ToolStripItemImageScaling.None;
system.DoubleClickEnabled = true;
system.DoubleClick += new EventHandler(OnSystemMenuDoubleClick);
system.Padding = Padding.Empty;
system.ShortcutKeys = Keys.Alt | Keys.OemMinus;
this.ResumeLayout(false);
}
