/// <devdoc> this takes a native menu and builds up a managed toolstrip around it.
/// Scenario: showing the items from the SystemMenu.
/// targetWindow is the window to send WM_COMMAND, WM_SYSCOMMAND to
/// hmenu is a handle to the native menu
///
///
internal static ToolStripDropDownMenu FromHMenu(IntPtr hmenu, IWin32Window targetWindow)
{
ToolStripDropDownMenu managedDropDown = new ToolStripDropDownMenu();
managedDropDown.SuspendLayout();
HandleRef menuHandle = new HandleRef(null, hmenu);
int count = UnsafeNativeMethods.GetMenuItemCount(menuHandle);
ToolStripItem itemToAdd;
// surf through the items in the collection, building up TSMenuItems and TSSeparators
// corresponding to the native menu.
for (int i = 0; i < count; i++)
{
// peek at the i'th item.
NativeMethods.MENUITEMINFO_T_RW info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf <NativeMethods.MENUITEMINFO_T_RW>();
info.fMask = NativeMethods.MIIM_FTYPE;
info.fType = NativeMethods.MIIM_FTYPE;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
if (info.fType == NativeMethods.MFT_SEPARATOR)
{
// its a separator.
itemToAdd = new ToolStripSeparator();
}
else
{
// its a menu item... lets fish out the command id
info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf <NativeMethods.MENUITEMINFO_T_RW>();
info.fMask = NativeMethods.MIIM_ID;
info.fType = NativeMethods.MIIM_ID;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
// create the managed object - toolstripmenu item knows how to grok hmenu for information.
itemToAdd = new ToolStripMenuItem(hmenu, info.wID, targetWindow);
// if there is a submenu fetch it.
info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf <NativeMethods.MENUITEMINFO_T_RW>();
info.fMask = NativeMethods.MIIM_SUBMENU;
info.fType = NativeMethods.MIIM_SUBMENU;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
if (info.hSubMenu != IntPtr.Zero)
{
// set the dropdown to be the items from the submenu
((ToolStripMenuItem)itemToAdd).DropDown = FromHMenu(info.hSubMenu, targetWindow);
}
}
managedDropDown.Items.Add(itemToAdd);
}
managedDropDown.ResumeLayout();
return(managedDropDown);
}
public static BOOL GetMenuItemInfo(HandleRef hMenu, int uItem, bool fByPosition, NativeMethods.MENUITEMINFO_T_RW lpmii)
{
BOOL result = GetMenuItemInfo(hMenu.Handle, uItem, fByPosition, lpmii);
GC.KeepAlive(hMenu.Wrapper);
return(result);
}
public static extern BOOL GetMenuItemInfo(IntPtr hMenu, int uItem, bool fByPosition, [In, Out] NativeMethods.MENUITEMINFO_T_RW lpmii);
/// <devdoc> this takes a native menu and builds up a managed toolstrip around it.
/// Scenario: showing the items from the SystemMenu.
/// targetWindow is the window to send WM_COMMAND, WM_SYSCOMMAND to
/// hmenu is a handle to the native menu
///
///
internal static ToolStripDropDownMenu FromHMenu(IntPtr hmenu, IWin32Window targetWindow) {
ToolStripDropDownMenu managedDropDown = new ToolStripDropDownMenu();
managedDropDown.SuspendLayout();
HandleRef menuHandle = new HandleRef(null, hmenu);
int count = UnsafeNativeMethods.GetMenuItemCount(menuHandle);
ToolStripItem itemToAdd;
// surf through the items in the collection, building up TSMenuItems and TSSeparators
// corresponding to the native menu.
for (int i = 0; i < count; i++) {
// peek at the i'th item.
NativeMethods.MENUITEMINFO_T_RW info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf(typeof(NativeMethods.MENUITEMINFO_T_RW));
info.fMask = NativeMethods.MIIM_FTYPE;
info.fType = NativeMethods.MIIM_FTYPE;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
if (info.fType == NativeMethods.MFT_SEPARATOR){
// its a separator.
itemToAdd = new ToolStripSeparator();
}
else {
// its a menu item... lets fish out the command id
info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf(typeof(NativeMethods.MENUITEMINFO_T_RW));
info.fMask = NativeMethods.MIIM_ID;
info.fType = NativeMethods.MIIM_ID;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
// create the managed object - toolstripmenu item knows how to grok hmenu for information.
itemToAdd = new ToolStripMenuItem(hmenu, info.wID, targetWindow);
// if there is a submenu fetch it.
info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf(typeof(NativeMethods.MENUITEMINFO_T_RW));
info.fMask = NativeMethods.MIIM_SUBMENU;
info.fType = NativeMethods.MIIM_SUBMENU;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
if (info.hSubMenu != IntPtr.Zero) {
// set the dropdown to be the items from the submenu
((ToolStripMenuItem)itemToAdd).DropDown = FromHMenu(info.hSubMenu, targetWindow);
}
}
managedDropDown.Items.Add(itemToAdd);
}
managedDropDown.ResumeLayout();
return managedDropDown;
}
private Image GetNativeMenuItemImage(){
if (nativeMenuCommandID == -1 || nativeMenuHandle == IntPtr.Zero) {
Debug.Fail("why were we called to fetch native menu item info with nothing assigned?");
return null;
}
NativeMethods.MENUITEMINFO_T_RW info = new NativeMethods.MENUITEMINFO_T_RW();
info.fMask = NativeMethods.MIIM_BITMAP;
info.fType = NativeMethods.MIIM_BITMAP;
info.wID = nativeMenuCommandID;
UnsafeNativeMethods.GetMenuItemInfo(new HandleRef(this, nativeMenuHandle), nativeMenuCommandID, /*fByPosition instead of ID=*/ false, info);
if (info.hbmpItem != IntPtr.Zero && info.hbmpItem.ToInt32() > NativeMethods.HBMMENU_POPUP_MINIMIZE) {
return Bitmap.FromHbitmap(info.hbmpItem);
}
else {
// its a system defined bitmap
int buttonToUse = -1;
switch (info.hbmpItem.ToInt32()) {
case NativeMethods.HBMMENU_MBAR_CLOSE:
case NativeMethods.HBMMENU_MBAR_CLOSE_D:
case NativeMethods.HBMMENU_POPUP_CLOSE:
buttonToUse = (int)CaptionButton.Close;
break;
case NativeMethods.HBMMENU_MBAR_MINIMIZE:
case NativeMethods.HBMMENU_MBAR_MINIMIZE_D:
case NativeMethods.HBMMENU_POPUP_MINIMIZE:
buttonToUse = (int)CaptionButton.Minimize;
break;
case NativeMethods.HBMMENU_MBAR_RESTORE:
case NativeMethods.HBMMENU_POPUP_RESTORE:
buttonToUse = (int)CaptionButton.Restore;
break;
case NativeMethods.HBMMENU_POPUP_MAXIMIZE:
buttonToUse = (int)CaptionButton.Maximize;
break;
case NativeMethods.HBMMENU_SYSTEM:
//
case NativeMethods.HBMMENU_CALLBACK:
// owner draw not supported
default:
break;
}
if (buttonToUse > -1) {
// we've mapped to a system defined bitmap we know how to draw
Bitmap image = new Bitmap(16, 16);
using (Graphics g = Graphics.FromImage(image)) {
ControlPaint.DrawCaptionButton(g, new Rectangle(Point.Empty, image.Size), (CaptionButton)buttonToUse, ButtonState.Flat);
g.DrawRectangle(SystemPens.Control, 0, 0, image.Width - 1, image.Height - 1);
}
image.MakeTransparent(SystemColors.Control);
return image;
}
}
return null;
}
// returns text and shortcut separated by tab.
private string GetNativeMenuItemTextAndShortcut() {
if (nativeMenuCommandID == -1 || nativeMenuHandle == IntPtr.Zero) {
Debug.Fail("why were we called to fetch native menu item info with nothing assigned?");
return null;
}
string text = null;
// fetch the string length
NativeMethods.MENUITEMINFO_T_RW info = new NativeMethods.MENUITEMINFO_T_RW();
info.fMask = NativeMethods.MIIM_STRING;
info.fType = NativeMethods.MIIM_STRING;
info.wID = nativeMenuCommandID;
info.dwTypeData = IntPtr.Zero;
UnsafeNativeMethods.GetMenuItemInfo(new HandleRef(this, nativeMenuHandle), nativeMenuCommandID, /*fByPosition instead of ID=*/ false, info);
if (info.cch > 0) {
// fetch the string
info.cch += 1; // according to MSDN we need to increment the count we receive by 1.
info.wID = nativeMenuCommandID;
IntPtr allocatedStringBuffer = Marshal.AllocCoTaskMem(info.cch * Marshal.SystemDefaultCharSize);
info.dwTypeData = allocatedStringBuffer;
try {
UnsafeNativeMethods.GetMenuItemInfo(new HandleRef(this, nativeMenuHandle), nativeMenuCommandID, /*fByPosition instead of ID=*/ false, info);
// convert the string into managed data.
if (info.dwTypeData != IntPtr.Zero){
// we have to use PtrToStringAuto as we can't use Marshal.SizeOf to determine
// the size of the struct with a StringBuilder member.
text = Marshal.PtrToStringAuto(info.dwTypeData, info.cch);
}
}
finally {
if (allocatedStringBuffer != IntPtr.Zero) {
// use our local instead of the info structure member *just* in case windows decides to clobber over it.
// we want to be sure to deallocate the memory we know we allocated.
Marshal.FreeCoTaskMem(allocatedStringBuffer);
}
}
}
return text;
}
private bool GetNativeMenuItemEnabled() {
if (nativeMenuCommandID == -1 || nativeMenuHandle == IntPtr.Zero) {
Debug.Fail("why were we called to fetch native menu item info with nothing assigned?");
return false;
}
NativeMethods.MENUITEMINFO_T_RW info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf(typeof(NativeMethods.MENUITEMINFO_T_RW));
info.fMask = NativeMethods.MIIM_STATE;
info.fType = NativeMethods.MIIM_STATE;
info.wID = nativeMenuCommandID;
UnsafeNativeMethods.GetMenuItemInfo(new HandleRef(this, nativeMenuHandle), nativeMenuCommandID, /*fByPosition instead of ID=*/ false, info);
return ((info.fState & NativeMethods.MFS_DISABLED) == 0);
}